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//+--------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// Abstract:
// DirectX Typography Services public API definitions.
//
//----------------------------------------------------------------------------
#ifndef DWRITE_H_INCLUDED
#define DWRITE_H_INCLUDED
#pragma once
#ifndef DWRITE_NO_WINDOWS_H
#include <specstrings.h>
#include <unknwn.h>
#endif // DWRITE_NO_WINDOWS_H
#include <dcommon.h>
#ifndef DWRITE_DECLARE_INTERFACE
#define DWRITE_DECLARE_INTERFACE(iid) DECLSPEC_UUID(iid) DECLSPEC_NOVTABLE #endif
#ifndef DWRITE_EXPORT
#define DWRITE_EXPORT __declspec(dllimport) WINAPI #endif
/// <summary>
/// The type of a font represented by a single font file.
/// Font formats that consist of multiple files, e.g. Type 1 .PFM and .PFB, have
/// separate enum values for each of the file type.
/// </summary>
enum
DWRITE_FONT_FILE_TYPE
{
/// <summary>
/// Font type is not recognized by the DirectWrite font system.
/// </summary>
DWRITE_FONT_FILE_TYPE_UNKNOWN
,
/// <summary>
/// OpenType font with CFF outlines.
/// </summary>
DWRITE_FONT_FILE_TYPE_CFF
,
/// <summary>
/// OpenType font with TrueType outlines.
/// </summary>
DWRITE_FONT_FILE_TYPE_TRUETYPE
,
/// <summary>
/// OpenType font that contains a TrueType collection.
/// </summary>
DWRITE_FONT_FILE_TYPE_OPENTYPE_COLLECTION
,
/// <summary>
/// Type 1 PFM font.
/// </summary>
DWRITE_FONT_FILE_TYPE_TYPE1_PFM
,
/// <summary>
/// Type 1 PFB font.
/// </summary>
DWRITE_FONT_FILE_TYPE_TYPE1_PFB
,
/// <summary>
/// Vector .FON font.
/// </summary>
DWRITE_FONT_FILE_TYPE_VECTOR
,
/// <summary>
/// Bitmap .FON font.
/// </summary>
DWRITE_FONT_FILE_TYPE_BITMAP
,
// The following name is obsolete, but kept as an alias to avoid breaking existing code.
DWRITE_FONT_FILE_TYPE_TRUETYPE_COLLECTION
=
DWRITE_FONT_FILE_TYPE_OPENTYPE_COLLECTION
, };
/// <summary>
/// The file format of a complete font face.
/// Font formats that consist of multiple files, e.g. Type 1 .PFM and .PFB, have
/// a single enum entry.
/// </summary>
enum
DWRITE_FONT_FACE_TYPE
{
/// <summary>
/// OpenType font face with CFF outlines.
/// </summary>
DWRITE_FONT_FACE_TYPE_CFF
,
/// <summary>
/// OpenType font face with TrueType outlines.
/// </summary>
DWRITE_FONT_FACE_TYPE_TRUETYPE
,
/// <summary>
/// OpenType font face that is a part of a TrueType or CFF collection.
/// </summary>
DWRITE_FONT_FACE_TYPE_OPENTYPE_COLLECTION
,
/// <summary>
/// A Type 1 font face.
/// </summary>
DWRITE_FONT_FACE_TYPE_TYPE1
,
/// <summary>
/// A vector .FON format font face.
/// </summary>
DWRITE_FONT_FACE_TYPE_VECTOR
,
/// <summary>
/// A bitmap .FON format font face.
/// </summary>
DWRITE_FONT_FACE_TYPE_BITMAP
,
/// <summary>
/// Font face type is not recognized by the DirectWrite font system.
/// </summary>
DWRITE_FONT_FACE_TYPE_UNKNOWN
,
/// <summary>
/// The font data includes only the CFF table from an OpenType CFF font.
/// This font face type can be used only for embedded fonts (i.e., custom
/// font file loaders) and the resulting font face object supports only the
/// minimum functionality necessary to render glyphs.
/// </summary>
DWRITE_FONT_FACE_TYPE_RAW_CFF
,
// The following name is obsolete, but kept as an alias to avoid breaking existing code.
DWRITE_FONT_FACE_TYPE_TRUETYPE_COLLECTION
=
DWRITE_FONT_FACE_TYPE_OPENTYPE_COLLECTION
, };
/// <summary>
/// Specifies algorithmic style simulations to be applied to the font face.
/// Bold and oblique simulations can be combined via bitwise OR operation.
/// </summary>
enum
DWRITE_FONT_SIMULATIONS
{
/// <summary>
/// No simulations are performed.
/// </summary>
DWRITE_FONT_SIMULATIONS_NONE
=
0x0000
,
/// <summary>
/// Algorithmic emboldening is performed.
/// </summary>
DWRITE_FONT_SIMULATIONS_BOLD
=
0x0001
,
/// <summary>
/// Algorithmic italicization is performed.
/// </summary>
DWRITE_FONT_SIMULATIONS_OBLIQUE
=
0x0002
};
#ifdef DEFINE_ENUM_FLAG_OPERATORS
/// <summary>
/// The font weight enumeration describes common values for degree of blackness or thickness of strokes of characters in a font.
/// Font weight values less than 1 or greater than 999 are considered to be invalid, and they are rejected by font API functions.
/// </summary>
enum
DWRITE_FONT_WEIGHT
{
/// <summary>
/// Predefined font weight : Thin (100).
/// </summary>
DWRITE_FONT_WEIGHT_THIN
=
100
,
/// <summary>
/// Predefined font weight : Extra-light (200).
/// </summary>
DWRITE_FONT_WEIGHT_EXTRA_LIGHT
=
200
,
/// <summary>
/// Predefined font weight : Ultra-light (200).
/// </summary>
DWRITE_FONT_WEIGHT_ULTRA_LIGHT
=
200
,
/// <summary>
/// Predefined font weight : Light (300).
/// </summary>
DWRITE_FONT_WEIGHT_LIGHT
=
300
,
/// <summary>
/// Predefined font weight : Semi-light (350).
/// </summary>
DWRITE_FONT_WEIGHT_SEMI_LIGHT
=
350
,
/// <summary>
/// Predefined font weight : Normal (400).
/// </summary>
DWRITE_FONT_WEIGHT_NORMAL
=
400
,
/// <summary>
/// Predefined font weight : Regular (400).
/// </summary>
DWRITE_FONT_WEIGHT_REGULAR
=
400
,
/// <summary>
/// Predefined font weight : Medium (500).
/// </summary>
DWRITE_FONT_WEIGHT_MEDIUM
=
500
,
/// <summary>
/// Predefined font weight : Demi-bold (600).
/// </summary>
DWRITE_FONT_WEIGHT_DEMI_BOLD
=
600
,
/// <summary>
/// Predefined font weight : Semi-bold (600).
/// </summary>
DWRITE_FONT_WEIGHT_SEMI_BOLD
=
600
,
/// <summary>
/// Predefined font weight : Bold (700).
/// </summary>
DWRITE_FONT_WEIGHT_BOLD
=
700
,
/// <summary>
/// Predefined font weight : Extra-bold (800).
/// </summary>
DWRITE_FONT_WEIGHT_EXTRA_BOLD
=
800
,
/// <summary>
/// Predefined font weight : Ultra-bold (800).
/// </summary>
DWRITE_FONT_WEIGHT_ULTRA_BOLD
=
800
,
/// <summary>
/// Predefined font weight : Black (900).
/// </summary>
DWRITE_FONT_WEIGHT_BLACK
=
900
,
/// <summary>
/// Predefined font weight : Heavy (900).
/// </summary>
DWRITE_FONT_WEIGHT_HEAVY
=
900
,
/// <summary>
/// Predefined font weight : Extra-black (950).
/// </summary>
DWRITE_FONT_WEIGHT_EXTRA_BLACK
=
950
,
/// <summary>
/// Predefined font weight : Ultra-black (950).
/// </summary>
DWRITE_FONT_WEIGHT_ULTRA_BLACK
=
950
};
/// <summary>
/// The font stretch enumeration describes relative change from the normal aspect ratio
/// as specified by a font designer for the glyphs in a font.
/// Values less than 1 or greater than 9 are considered to be invalid, and they are rejected by font API functions.
/// </summary>
enum
DWRITE_FONT_STRETCH
{
/// <summary>
/// Predefined font stretch : Not known (0).
/// </summary>
DWRITE_FONT_STRETCH_UNDEFINED
=
0
,
/// <summary>
/// Predefined font stretch : Ultra-condensed (1).
/// </summary>
DWRITE_FONT_STRETCH_ULTRA_CONDENSED
=
1
,
/// <summary>
/// Predefined font stretch : Extra-condensed (2).
/// </summary>
DWRITE_FONT_STRETCH_EXTRA_CONDENSED
=
2
,
/// <summary>
/// Predefined font stretch : Condensed (3).
/// </summary>
DWRITE_FONT_STRETCH_CONDENSED
=
3
,
/// <summary>
/// Predefined font stretch : Semi-condensed (4).
/// </summary>
DWRITE_FONT_STRETCH_SEMI_CONDENSED
=
4
,
/// <summary>
/// Predefined font stretch : Normal (5).
/// </summary>
DWRITE_FONT_STRETCH_NORMAL
=
5
,
/// <summary>
/// Predefined font stretch : Medium (5).
/// </summary>
DWRITE_FONT_STRETCH_MEDIUM
=
5
,
/// <summary>
/// Predefined font stretch : Semi-expanded (6).
/// </summary>
DWRITE_FONT_STRETCH_SEMI_EXPANDED
=
6
,
/// <summary>
/// Predefined font stretch : Expanded (7).
/// </summary>
DWRITE_FONT_STRETCH_EXPANDED
=
7
,
/// <summary>
/// Predefined font stretch : Extra-expanded (8).
/// </summary>
DWRITE_FONT_STRETCH_EXTRA_EXPANDED
=
8
,
/// <summary>
/// Predefined font stretch : Ultra-expanded (9).
/// </summary>
DWRITE_FONT_STRETCH_ULTRA_EXPANDED
=
9
};
/// <summary>
/// The font style enumeration describes the slope style of a font face, such as Normal, Italic or Oblique.
/// Values other than the ones defined in the enumeration are considered to be invalid, and they are rejected by font API functions.
/// </summary>
enum
DWRITE_FONT_STYLE
{
/// <summary>
/// Font slope style : Normal.
/// </summary>
DWRITE_FONT_STYLE_NORMAL
,
/// <summary>
/// Font slope style : Oblique.
/// </summary>
DWRITE_FONT_STYLE_OBLIQUE
,
/// <summary>
/// Font slope style : Italic.
/// </summary>
DWRITE_FONT_STYLE_ITALIC
};
/// <summary>
/// The informational string enumeration identifies a string in a font.
/// </summary>
enum
DWRITE_INFORMATIONAL_STRING_ID
{
/// <summary>
/// Unspecified name ID.
/// </summary>
DWRITE_INFORMATIONAL_STRING_NONE
,
/// <summary>
/// Copyright notice provided by the font.
/// </summary>
,
/// <summary>
/// String containing a version number.
/// </summary>
DWRITE_INFORMATIONAL_STRING_VERSION_STRINGS
,
/// <summary>
/// Trademark information provided by the font.
/// </summary>
DWRITE_INFORMATIONAL_STRING_TRADEMARK
,
/// <summary>
/// Name of the font manufacturer.
/// </summary>
DWRITE_INFORMATIONAL_STRING_MANUFACTURER
,
/// <summary>
/// Name of the font designer.
/// </summary>
DWRITE_INFORMATIONAL_STRING_DESIGNER
,
/// <summary>
/// URL of font designer (with protocol, e.g., http://, ftp://).
/// </summary>
DWRITE_INFORMATIONAL_STRING_DESIGNER_URL
,
/// <summary>
/// Description of the font. Can contain revision information, usage recommendations, history, features, etc.
/// </summary>
DWRITE_INFORMATIONAL_STRING_DESCRIPTION
,
/// <summary>
/// URL of font vendor (with protocol, e.g., http://, ftp://). If a unique serial number is embedded in the URL, it can be used to register the font.
/// </summary>
DWRITE_INFORMATIONAL_STRING_FONT_VENDOR_URL
,
/// <summary>
/// Description of how the font may be legally used, or different example scenarios for licensed use. This field should be written in plain language, not legalese.
/// </summary>
DWRITE_INFORMATIONAL_STRING_LICENSE_DESCRIPTION
,
/// <summary>
/// URL where additional licensing information can be found.
/// </summary>
DWRITE_INFORMATIONAL_STRING_LICENSE_INFO_URL
,
/// <summary>
/// GDI-compatible family name. Because GDI allows a maximum of four fonts per family, fonts in the same family may have different GDI-compatible family names
/// (e.g., "Arial", "Arial Narrow", "Arial Black").
/// </summary>
DWRITE_INFORMATIONAL_STRING_WIN32_FAMILY_NAMES
,
/// <summary>
/// GDI-compatible subfamily name.
/// </summary>
DWRITE_INFORMATIONAL_STRING_WIN32_SUBFAMILY_NAMES
,
/// <summary>
/// Typographic family name preferred by the designer. This enables font designers to group more than four fonts in a single family without losing compatibility with
/// GDI. This name is typically only present if it differs from the GDI-compatible family name.
/// </summary>
DWRITE_INFORMATIONAL_STRING_TYPOGRAPHIC_FAMILY_NAMES
,
/// <summary>
/// Typographic subfamily name preferred by the designer. This name is typically only present if it differs from the GDI-compatible subfamily name.
/// </summary>
DWRITE_INFORMATIONAL_STRING_TYPOGRAPHIC_SUBFAMILY_NAMES
,
/// <summary>
/// Sample text. This can be the font name or any other text that the designer thinks is the best example to display the font in.
/// </summary>
DWRITE_INFORMATIONAL_STRING_SAMPLE_TEXT
,
/// <summary>
/// The full name of the font, e.g. "Arial Bold", from name id 4 in the name table.
/// </summary>
DWRITE_INFORMATIONAL_STRING_FULL_NAME
,
/// <summary>
/// The postscript name of the font, e.g. "GillSans-Bold" from name id 6 in the name table.
/// </summary>
DWRITE_INFORMATIONAL_STRING_POSTSCRIPT_NAME
,
/// <summary>
/// The postscript CID findfont name, from name id 20 in the name table.
/// </summary>
DWRITE_INFORMATIONAL_STRING_POSTSCRIPT_CID_NAME
,
/// <summary>
/// Family name for the weight-stretch-style model.
/// </summary>
DWRITE_INFORMATIONAL_STRING_WEIGHT_STRETCH_STYLE_FAMILY_NAME
,
/// <summary>
/// Script/language tag to identify the scripts or languages that the font was
/// primarily designed to support. See DWRITE_FONT_PROPERTY_ID_DESIGN_SCRIPT_LANGUAGE_TAG
/// for a longer description.
/// </summary>
DWRITE_INFORMATIONAL_STRING_DESIGN_SCRIPT_LANGUAGE_TAG
,
/// <summary>
/// Script/language tag to identify the scripts or languages that the font declares
/// it is able to support.
/// </summary>
DWRITE_INFORMATIONAL_STRING_SUPPORTED_SCRIPT_LANGUAGE_TAG
,
// Obsolete aliases kept to avoid breaking existing code.
DWRITE_INFORMATIONAL_STRING_PREFERRED_FAMILY_NAMES
=
DWRITE_INFORMATIONAL_STRING_TYPOGRAPHIC_FAMILY_NAMES
,
DWRITE_INFORMATIONAL_STRING_PREFERRED_SUBFAMILY_NAMES
=
DWRITE_INFORMATIONAL_STRING_TYPOGRAPHIC_SUBFAMILY_NAMES
,
DWRITE_INFORMATIONAL_STRING_WWS_FAMILY_NAME
=
DWRITE_INFORMATIONAL_STRING_WEIGHT_STRETCH_STYLE_FAMILY_NAME
, };
/// <summary>
/// The DWRITE_FONT_METRICS structure specifies the metrics of a font face that
/// are applicable to all glyphs within the font face.
/// </summary>
struct
DWRITE_FONT_METRICS
{
/// <summary>
/// The number of font design units per em unit.
/// Font files use their own coordinate system of font design units.
/// A font design unit is the smallest measurable unit in the em square,
/// an imaginary square that is used to size and align glyphs.
/// The concept of em square is used as a reference scale factor when defining font size and device transformation semantics.
/// The size of one em square is also commonly used to compute the paragraph indentation value.
/// </summary>
UINT16
designUnitsPerEm
;
/// <summary>
/// Ascent value of the font face in font design units.
/// Ascent is the distance from the top of font character alignment box to English baseline.
/// </summary>
UINT16
ascent
;
/// <summary>
/// Descent value of the font face in font design units.
/// Descent is the distance from the bottom of font character alignment box to English baseline.
/// </summary>
UINT16
descent
;
/// <summary>
/// Line gap in font design units.
/// Recommended additional white space to add between lines to improve legibility. The recommended line spacing
/// (baseline-to-baseline distance) is thus the sum of ascent, descent, and lineGap. The line gap is usually
/// positive or zero but can be negative, in which case the recommended line spacing is less than the height
/// of the character alignment box.
/// </summary>
INT16
lineGap
;
/// <summary>
/// Cap height value of the font face in font design units.
/// Cap height is the distance from English baseline to the top of a typical English capital.
/// Capital "H" is often used as a reference character for the purpose of calculating the cap height value.
/// </summary>
UINT16
capHeight
;
/// <summary>
/// x-height value of the font face in font design units.
/// x-height is the distance from English baseline to the top of lowercase letter "x", or a similar lowercase character.
/// </summary>
UINT16
xHeight
;
/// <summary>
/// The underline position value of the font face in font design units.
/// Underline position is the position of underline relative to the English baseline.
/// The value is usually made negative in order to place the underline below the baseline.
/// </summary>
INT16
underlinePosition
;
/// <summary>
/// The suggested underline thickness value of the font face in font design units.
/// </summary>
UINT16
underlineThickness
;
/// <summary>
/// The strikethrough position value of the font face in font design units.
/// Strikethrough position is the position of strikethrough relative to the English baseline.
/// The value is usually made positive in order to place the strikethrough above the baseline.
/// </summary>
INT16
strikethroughPosition
;
/// <summary>
/// The suggested strikethrough thickness value of the font face in font design units.
/// </summary>
UINT16
strikethroughThickness
; };
/// <summary>
/// The DWRITE_GLYPH_METRICS structure specifies the metrics of an individual glyph.
/// The units depend on how the metrics are obtained.
/// </summary>
struct
DWRITE_GLYPH_METRICS
{
/// <summary>
/// Specifies the X offset from the glyph origin to the left edge of the black box.
/// The glyph origin is the current horizontal writing position.
/// A negative value means the black box extends to the left of the origin (often true for lowercase italic 'f').
/// </summary>
INT32
leftSideBearing
;
/// <summary>
/// Specifies the X offset from the origin of the current glyph to the origin of the next glyph when writing horizontally.
/// </summary>
UINT32
advanceWidth
;
/// <summary>
/// Specifies the X offset from the right edge of the black box to the origin of the next glyph when writing horizontally.
/// The value is negative when the right edge of the black box overhangs the layout box.
/// </summary>
INT32
rightSideBearing
;
/// <summary>
/// Specifies the vertical offset from the vertical origin to the top of the black box.
/// Thus, a positive value adds whitespace whereas a negative value means the glyph overhangs the top of the layout box.
/// </summary>
INT32
topSideBearing
;
/// <summary>
/// Specifies the Y offset from the vertical origin of the current glyph to the vertical origin of the next glyph when writing vertically.
/// (Note that the term "origin" by itself denotes the horizontal origin. The vertical origin is different.
/// Its Y coordinate is specified by verticalOriginY value,
/// and its X coordinate is half the advanceWidth to the right of the horizontal origin).
/// </summary>
UINT32
advanceHeight
;
/// <summary>
/// Specifies the vertical distance from the black box's bottom edge to the advance height.
/// Positive when the bottom edge of the black box is within the layout box.
/// Negative when the bottom edge of black box overhangs the layout box.
/// </summary>
INT32
bottomSideBearing
;
/// <summary>
/// Specifies the Y coordinate of a glyph's vertical origin, in the font's design coordinate system.
/// The y coordinate of a glyph's vertical origin is the sum of the glyph's top side bearing
/// and the top (i.e. yMax) of the glyph's bounding box.
/// </summary>
INT32
verticalOriginY
; };
/// <summary>
/// Optional adjustment to a glyph's position. A glyph offset changes the position of a glyph without affecting
/// the pen position. Offsets are in logical, pre-transform units.
/// </summary>
struct
DWRITE_GLYPH_OFFSET
{
/// <summary>
/// Offset in the advance direction of the run. A positive advance offset moves the glyph to the right
/// (in pre-transform coordinates) if the run is left-to-right or to the left if the run is right-to-left.
/// </summary>
FLOAT
advanceOffset
;
/// <summary>
/// Offset in the ascent direction, i.e., the direction ascenders point. A positive ascender offset moves
/// the glyph up (in pre-transform coordinates).
/// </summary>
FLOAT
ascenderOffset
; };
/// <summary>
/// Specifies the type of DirectWrite factory object.
/// DirectWrite factory contains internal state such as font loader registration and cached font data.
/// In most cases it is recommended to use the shared factory object, because it allows multiple components
/// that use DirectWrite to share internal DirectWrite state and reduce memory usage.
/// However, there are cases when it is desirable to reduce the impact of a component,
/// such as a plug-in from an untrusted source, on the rest of the process by sandboxing and isolating it
/// from the rest of the process components. In such cases, it is recommended to use an isolated factory for the sandboxed
/// component.
/// </summary>
enum
DWRITE_FACTORY_TYPE
{
/// <summary>
/// Shared factory allow for re-use of cached font data across multiple in process components.
/// Such factories also take advantage of cross process font caching components for better performance.
/// </summary>
DWRITE_FACTORY_TYPE_SHARED
,
/// <summary>
/// Objects created from the isolated factory do not interact with internal DirectWrite state from other components.
/// </summary>
DWRITE_FACTORY_TYPE_ISOLATED
};
/// <summary>
/// Creates an OpenType tag as a 32bit integer such that
/// the first character in the tag is the lowest byte,
/// (least significant on little endian architectures)
/// which can be used to compare with tags in the font file.
/// This macro is compatible with DWRITE_FONT_FEATURE_TAG.
///
/// Example: DWRITE_MAKE_OPENTYPE_TAG('c','c','m','p')
/// Dword: 0x706D6363
/// </summary>
#define DWRITE_MAKE_OPENTYPE_TAG(a,b,c,d) ( \
(static_cast<UINT32>(static_cast<UINT8>(d)) << 24) | \
(static_cast<UINT32>(static_cast<UINT8>(c)) << 16) | \
(static_cast<UINT32>(static_cast<UINT8>(b)) << 8) | \
static_cast<UINT32>(static_cast<UINT8>(a)))
/// <summary>
/// Creates an OpenType tag for glyph positioning and substitution font features.
/// </summary>
#define DWRITE_MAKE_FONT_FEATURE_TAG(a,b,c,d) (static_cast<DWRITE_FONT_FEATURE_TAG>(DWRITE_MAKE_OPENTYPE_TAG(a,b,c,d)))
/// <summary>
/// Font file loader interface handles loading font file resources of a particular type from a key.
/// The font file loader interface is recommended to be implemented by a singleton object.
/// IMPORTANT: font file loader implementations must not register themselves with DirectWrite factory
/// inside their constructors and must not unregister themselves in their destructors, because
/// registration and unregistration operations increment and decrement the object reference count respectively.
/// Instead, registration and unregistration of font file loaders with DirectWrite factory should be performed
/// outside of the font file loader implementation as a separate step.
/// </summary>
{
/// <summary>
/// Creates a font file stream object that encapsulates an open file resource.
/// The resource is closed when the last reference to fontFileStream is released.
/// </summary>
/// <param name="fontFileReferenceKey">Font file reference key that uniquely identifies the font file resource
/// within the scope of the font loader being used.</param>
/// <param name="fontFileReferenceKeySize">Size of font file reference key in bytes.</param>
/// <param name="fontFileStream">Pointer to the newly created font file stream.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
fontFileReferenceKeySize
, };
/// <summary>
/// A built-in implementation of IDWriteFontFileLoader interface that operates on local font files
/// and exposes local font file information from the font file reference key.
/// Font file references created using CreateFontFileReference use this font file loader.
/// </summary>
{
/// <summary>
/// Obtains the length of the absolute file path from the font file reference key.
/// </summary>
/// <param name="fontFileReferenceKey">Font file reference key that uniquely identifies the local font file
/// within the scope of the font loader being used.</param>
/// <param name="fontFileReferenceKeySize">Size of font file reference key in bytes.</param>
/// <param name="filePathLength">Length of the file path string not including the terminated NULL character.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
fontFileReferenceKeySize
,
/// <summary>
/// Obtains the absolute font file path from the font file reference key.
/// </summary>
/// <param name="fontFileReferenceKey">Font file reference key that uniquely identifies the local font file
/// within the scope of the font loader being used.</param>
/// <param name="fontFileReferenceKeySize">Size of font file reference key in bytes.</param>
/// <param name="filePath">Character array that receives the local file path.</param>
/// <param name="filePathSize">Size of the filePath array in character count including the terminated NULL character.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
fontFileReferenceKeySize
,
UINT32
filePathSize
/// <summary>
/// Obtains the last write time of the file from the font file reference key.
/// </summary>
/// <param name="fontFileReferenceKey">Font file reference key that uniquely identifies the local font file
/// within the scope of the font loader being used.</param>
/// <param name="fontFileReferenceKeySize">Size of font file reference key in bytes.</param>
/// <param name="lastWriteTime">Last modified time of the font file.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
fontFileReferenceKeySize
, };
/// <summary>
/// The interface for loading font file data.
/// </summary>
{
/// <summary>
/// Reads a fragment from a file.
/// </summary>
/// <param name="fragmentStart">Receives the pointer to the start of the font file fragment.</param>
/// <param name="fileOffset">Offset of the fragment from the beginning of the font file.</param>
/// <param name="fragmentSize">Size of the fragment in bytes.</param>
/// <param name="fragmentContext">The client defined context to be passed to the ReleaseFileFragment.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// IMPORTANT: ReadFileFragment() implementations must check whether the requested file fragment
/// is within the file bounds. Otherwise, an error should be returned from ReadFileFragment.
/// </remarks>
UINT64
fileOffset
,
UINT64
fragmentSize
,
/// <summary>
/// Releases a fragment from a file.
/// </summary>
/// <param name="fragmentContext">The client defined context of a font fragment returned from ReadFileFragment.</param>
void
*
fragmentContext
/// <summary>
/// Obtains the total size of a file.
/// </summary>
/// <param name="fileSize">Receives the total size of the file.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// Implementing GetFileSize() for asynchronously loaded font files may require
/// downloading the complete file contents, therefore this method should only be used for operations that
/// either require complete font file to be loaded (e.g., copying a font file) or need to make
/// decisions based on the value of the file size (e.g., validation against a persisted file size).
/// </remarks>
/// <summary>
/// Obtains the last modified time of the file. The last modified time is used by DirectWrite font selection algorithms
/// to determine whether one font resource is more up to date than another one.
/// </summary>
/// <param name="lastWriteTime">Receives the last modified time of the file in the format that represents
/// the number of 100-nanosecond intervals since January 1, 1601 (UTC).</param>
/// <returns>
/// Standard HRESULT error code. For resources that don't have a concept of the last modified time, the implementation of
/// GetLastWriteTime should return E_NOTIMPL.
/// </returns>
};
/// <summary>
/// The interface that represents a reference to a font file.
/// </summary>
{
/// <summary>
/// This method obtains the pointer to the reference key of a font file. The pointer is only valid until the object that refers to it is released.
/// </summary>
/// <param name="fontFileReferenceKey">Pointer to the font file reference key.
/// IMPORTANT: The pointer value is valid until the font file reference object it is obtained from is released.</param>
/// <param name="fontFileReferenceKeySize">Size of font file reference key in bytes.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Obtains the file loader associated with a font file object.
/// </summary>
/// <param name="fontFileLoader">The font file loader associated with the font file object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Analyzes a file and returns whether it represents a font, and whether the font type is supported by the font system.
/// </summary>
/// <param name="isSupportedFontType">TRUE if the font type is supported by the font system, FALSE otherwise.</param>
/// <param name="fontFileType">The type of the font file. Note that even if isSupportedFontType is FALSE,
/// the fontFileType value may be different from DWRITE_FONT_FILE_TYPE_UNKNOWN.</param>
/// <param name="fontFaceType">The type of the font face that can be constructed from the font file.
/// Note that even if isSupportedFontType is FALSE, the fontFaceType value may be different from
/// DWRITE_FONT_FACE_TYPE_UNKNOWN.</param>
/// <param name="numberOfFaces">Number of font faces contained in the font file.</param>
/// <returns>
/// Standard HRESULT error code if there was a processing error during analysis.
/// </returns>
/// <remarks>
/// IMPORTANT: certain font file types are recognized, but not supported by the font system.
/// For example, the font system will recognize a file as a Type 1 font file,
/// but will not be able to construct a font face object from it. In such situations, Analyze will set
/// isSupportedFontType output parameter to FALSE.
/// </remarks>
};
/// <summary>
/// Represents the internal structure of a device pixel (i.e., the physical arrangement of red,
/// green, and blue color components) that is assumed for purposes of rendering text.
/// </summary>
#ifndef DWRITE_PIXEL_GEOMETRY_DEFINED
enum
DWRITE_PIXEL_GEOMETRY
{
/// <summary>
/// The red, green, and blue color components of each pixel are assumed to occupy the same point.
/// </summary>
DWRITE_PIXEL_GEOMETRY_FLAT
,
/// <summary>
/// Each pixel comprises three vertical stripes, with red on the left, green in the center, and
/// blue on the right. This is the most common pixel geometry for LCD monitors.
/// </summary>
DWRITE_PIXEL_GEOMETRY_RGB
,
/// <summary>
/// Each pixel comprises three vertical stripes, with blue on the left, green in the center, and
/// red on the right.
/// </summary>
DWRITE_PIXEL_GEOMETRY_BGR
};
#define DWRITE_PIXEL_GEOMETRY_DEFINED #endif
/// <summary>
/// Represents a method of rendering glyphs.
/// </summary>
enum
DWRITE_RENDERING_MODE
{
/// <summary>
/// Specifies that the rendering mode is determined automatically based on the font and size.
/// </summary>
DWRITE_RENDERING_MODE_DEFAULT
,
/// <summary>
/// Specifies that no antialiasing is performed. Each pixel is either set to the foreground
/// color of the text or retains the color of the background.
/// </summary>
DWRITE_RENDERING_MODE_ALIASED
,
/// <summary>
/// Specifies that antialiasing is performed in the horizontal direction and the appearance
/// of glyphs is layout-compatible with GDI using CLEARTYPE_QUALITY. Use DWRITE_MEASURING_MODE_GDI_CLASSIC
/// to get glyph advances. The antialiasing may be either ClearType or grayscale depending on
/// the text antialiasing mode.
/// </summary>
DWRITE_RENDERING_MODE_GDI_CLASSIC
,
/// <summary>
/// Specifies that antialiasing is performed in the horizontal direction and the appearance
/// of glyphs is layout-compatible with GDI using CLEARTYPE_NATURAL_QUALITY. Glyph advances
/// are close to the font design advances, but are still rounded to whole pixels. Use
/// DWRITE_MEASURING_MODE_GDI_NATURAL to get glyph advances. The antialiasing may be either
/// ClearType or grayscale depending on the text antialiasing mode.
/// </summary>
DWRITE_RENDERING_MODE_GDI_NATURAL
,
/// <summary>
/// Specifies that antialiasing is performed in the horizontal direction. This rendering
/// mode allows glyphs to be positioned with subpixel precision and is therefore suitable
/// for natural (i.e., resolution-independent) layout. The antialiasing may be either
/// ClearType or grayscale depending on the text antialiasing mode.
/// </summary>
DWRITE_RENDERING_MODE_NATURAL
,
/// <summary>
/// Similar to natural mode except that antialiasing is performed in both the horizontal
/// and vertical directions. This is typically used at larger sizes to make curves and
/// diagonal lines look smoother. The antialiasing may be either ClearType or grayscale
/// depending on the text antialiasing mode.
/// </summary>
DWRITE_RENDERING_MODE_NATURAL_SYMMETRIC
,
/// <summary>
/// Specifies that rendering should bypass the rasterizer and use the outlines directly.
/// This is typically used at very large sizes.
/// </summary>
DWRITE_RENDERING_MODE_OUTLINE
,
// The following names are obsolete, but are kept as aliases to avoid breaking existing code.
// Each of these rendering modes may result in either ClearType or grayscale antialiasing
// depending on the DWRITE_TEXT_ANTIALIASING_MODE.
DWRITE_RENDERING_MODE_CLEARTYPE_GDI_CLASSIC
=
DWRITE_RENDERING_MODE_GDI_CLASSIC
,
DWRITE_RENDERING_MODE_CLEARTYPE_GDI_NATURAL
=
DWRITE_RENDERING_MODE_GDI_NATURAL
,
DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL
=
DWRITE_RENDERING_MODE_NATURAL
,
DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL_SYMMETRIC
=
DWRITE_RENDERING_MODE_NATURAL_SYMMETRIC
};
/// <summary>
/// The DWRITE_MATRIX structure specifies the graphics transform to be applied
/// to rendered glyphs.
/// </summary>
struct
DWRITE_MATRIX
{
/// <summary>
/// Horizontal scaling / cosine of rotation
/// </summary>
FLOAT
m11
;
/// <summary>
/// Vertical shear / sine of rotation
/// </summary>
FLOAT
m12
;
/// <summary>
/// Horizontal shear / negative sine of rotation
/// </summary>
FLOAT
m21
;
/// <summary>
/// Vertical scaling / cosine of rotation
/// </summary>
FLOAT
m22
;
/// <summary>
/// Horizontal shift (always orthogonal regardless of rotation)
/// </summary>
FLOAT
dx
;
/// <summary>
/// Vertical shift (always orthogonal regardless of rotation)
/// </summary>
FLOAT
dy
; };
/// <summary>
/// The interface that represents text rendering settings for glyph rasterization and filtering.
/// </summary>
{
/// <summary>
/// Gets the gamma value used for gamma correction. Valid values must be
/// greater than zero and cannot exceed 256.
/// </summary>
/// <summary>
/// Gets the amount of contrast enhancement. Valid values are greater than
/// or equal to zero.
/// </summary>
/// <summary>
/// Gets the ClearType level. Valid values range from 0.0f (no ClearType)
/// to 1.0f (full ClearType).
/// </summary>
/// <summary>
/// Gets the pixel geometry.
/// </summary>
/// <summary>
/// Gets the rendering mode.
/// </summary>
};
// Forward declarations of D2D types
typedef
ID2D1SimplifiedGeometrySink
IDWriteGeometrySink
;
/// <summary>
/// This interface exposes various font data such as metrics, names, and glyph outlines.
/// It contains font face type, appropriate file references and face identification data.
/// </summary>
{
/// <summary>
/// Obtains the file format type of a font face.
/// </summary>
/// <summary>
/// Obtains the font files representing a font face.
/// </summary>
/// <param name="numberOfFiles">The number of files representing the font face.</param>
/// <param name="fontFiles">User provided array that stores pointers to font files representing the font face.
/// This parameter can be NULL if the user is only interested in the number of files representing the font face.
/// This API increments reference count of the font file pointers returned according to COM conventions, and the client
/// should release them when finished.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Obtains the zero-based index of the font face in its font file or files. If the font files contain a single face,
/// the return value is zero.
/// </summary>
/// <summary>
/// Obtains the algorithmic style simulation flags of a font face.
/// </summary>
/// <summary>
/// Determines whether the font is a symbol font.
/// </summary>
/// <summary>
/// Obtains design units and common metrics for the font face.
/// These metrics are applicable to all the glyphs within a fontface and are used by applications for layout calculations.
/// </summary>
/// <param name="fontFaceMetrics">Points to a DWRITE_FONT_METRICS structure to fill in.
/// The metrics returned by this function are in font design units.</param>
/// <summary>
/// Obtains the number of glyphs in the font face.
/// </summary>
/// <summary>
/// Obtains ideal glyph metrics in font design units. Design glyphs metrics are used for glyph positioning.
/// </summary>
/// <param name="glyphIndices">An array of glyph indices to compute the metrics for.</param>
/// <param name="glyphCount">The number of elements in the glyphIndices array.</param>
/// <param name="glyphMetrics">Array of DWRITE_GLYPH_METRICS structures filled by this function.
/// The metrics returned by this function are in font design units.</param>
/// <param name="isSideways">Indicates whether the font is being used in a sideways run.
/// This can affect the glyph metrics if the font has oblique simulation
/// because sideways oblique simulation differs from non-sideways oblique simulation.</param>
/// <returns>
/// Standard HRESULT error code. If any of the input glyph indices are outside of the valid glyph index range
/// for the current font face, E_INVALIDARG will be returned.
/// </returns>
UINT32
glyphCount
,
/// <summary>
/// Returns the nominal mapping of UTF-32 Unicode code points to glyph indices as defined by the font 'cmap' table.
/// Note that this mapping is primarily provided for line layout engines built on top of the physical font API.
/// Because of OpenType glyph substitution and line layout character substitution, the nominal conversion does not always correspond
/// to how a Unicode string will map to glyph indices when rendering using a particular font face.
/// Also, note that Unicode Variation Selectors provide for alternate mappings for character to glyph.
/// This call will always return the default variant.
/// </summary>
/// <param name="codePoints">An array of UTF-32 code points to obtain nominal glyph indices from.</param>
/// <param name="codePointCount">The number of elements in the codePoints array.</param>
/// <param name="glyphIndices">Array of nominal glyph indices filled by this function.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
codePointCount
,
/// <summary>
/// Finds the specified OpenType font table if it exists and returns a pointer to it.
/// The function accesses the underlying font data via the IDWriteFontFileStream interface
/// implemented by the font file loader.
/// </summary>
/// <param name="openTypeTableTag">Four character tag of table to find.
/// Use the DWRITE_MAKE_OPENTYPE_TAG() macro to create it.
/// Unlike GDI, it does not support the special TTCF and null tags to access the whole font.</param>
/// <param name="tableData">
/// Pointer to base of table in memory.
/// The pointer is only valid so long as the FontFace used to get the font table still exists
/// (not any other FontFace, even if it actually refers to the same physical font).
/// </param>
/// <param name="tableSize">Byte size of table.</param>
/// <param name="tableContext">
/// Opaque context which must be freed by calling ReleaseFontTable.
/// The context actually comes from the lower level IDWriteFontFileStream,
/// which may be implemented by the application or DWrite itself.
/// It is possible for a NULL tableContext to be returned, especially if
/// the implementation directly memory maps the whole file.
/// Nevertheless, always release it later, and do not use it as a test for function success.
/// The same table can be queried multiple times,
/// but each returned context can be different, so release each separately.
/// </param>
/// <param name="exists">True if table exists.</param>
/// <returns>
/// Standard HRESULT error code.
/// If a table can not be found, the function will not return an error, but the size will be 0, table NULL, and exists = FALSE.
/// The context does not need to be freed if the table was not found.
/// </returns>
/// <remarks>
/// The context for the same tag may be different for each call,
/// so each one must be held and released separately.
/// </remarks>
/// <summary>
/// Releases the table obtained earlier from TryGetFontTable.
/// </summary>
/// <param name="tableContext">Opaque context from TryGetFontTable.</param>
/// <summary>
/// Computes the outline of a run of glyphs by calling back to the outline sink interface.
/// </summary>
/// <param name="emSize">Logical size of the font in DIP units. A DIP ("device-independent pixel") equals 1/96 inch.</param>
/// <param name="glyphIndices">Array of glyph indices.</param>
/// <param name="glyphAdvances">Optional array of glyph advances in DIPs.</param>
/// <param name="glyphOffsets">Optional array of glyph offsets.</param>
/// <param name="glyphCount">Number of glyphs.</param>
/// <param name="isSideways">If true, specifies that glyphs are rotated 90 degrees to the left and vertical metrics are used.
/// A client can render a vertical run by specifying isSideways = true and rotating the resulting geometry 90 degrees to the
/// right using a transform.</param>
/// <param name="isRightToLeft">If true, specifies that the advance direction is right to left. By default, the advance direction
/// is left to right.</param>
/// <param name="geometrySink">Interface the function calls back to draw each element of the geometry.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
FLOAT
emSize
,
UINT32
glyphCount
,
BOOL
isSideways
,
BOOL
isRightToLeft
,
/// <summary>
/// Determines the recommended rendering mode for the font given the specified size and rendering parameters.
/// </summary>
/// <param name="emSize">Logical size of the font in DIP units. A DIP ("device-independent pixel") equals 1/96 inch.</param>
/// <param name="pixelsPerDip">Number of physical pixels per DIP. For example, if the DPI of the rendering surface is 96 this
/// value is 1.0f. If the DPI is 120, this value is 120.0f/96.</param>
/// <param name="measuringMode">Specifies measuring mode that will be used for glyphs in the font.
/// Renderer implementations may choose different rendering modes for given measuring modes, but
/// best results are seen when the corresponding modes match:
/// DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL for DWRITE_MEASURING_MODE_NATURAL
/// DWRITE_RENDERING_MODE_CLEARTYPE_GDI_CLASSIC for DWRITE_MEASURING_MODE_GDI_CLASSIC
/// DWRITE_RENDERING_MODE_CLEARTYPE_GDI_NATURAL for DWRITE_MEASURING_MODE_GDI_NATURAL
/// </param>
/// <param name="renderingParams">Rendering parameters object. This parameter is necessary in case the rendering parameters
/// object overrides the rendering mode.</param>
/// <param name="renderingMode">Receives the recommended rendering mode to use.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
FLOAT
emSize
,
FLOAT
pixelsPerDip
,
DWRITE_MEASURING_MODE
measuringMode
,
IDWriteRenderingParams
*
renderingParams
,
/// <summary>
/// Obtains design units and common metrics for the font face.
/// These metrics are applicable to all the glyphs within a fontface and are used by applications for layout calculations.
/// </summary>
/// <param name="emSize">Logical size of the font in DIP units. A DIP ("device-independent pixel") equals 1/96 inch.</param>
/// <param name="pixelsPerDip">Number of physical pixels per DIP. For example, if the DPI of the rendering surface is 96 this
/// value is 1.0f. If the DPI is 120, this value is 120.0f/96.</param>
/// <param name="transform">Optional transform applied to the glyphs and their positions. This transform is applied after the
/// scaling specified by the font size and pixelsPerDip.</param>
/// <param name="fontFaceMetrics">Points to a DWRITE_FONT_METRICS structure to fill in.
/// The metrics returned by this function are in font design units.</param>
FLOAT
emSize
,
FLOAT
pixelsPerDip
,
/// <summary>
/// Obtains glyph metrics in font design units with the return values compatible with what GDI would produce.
/// Glyphs metrics are used for positioning of individual glyphs.
/// </summary>
/// <param name="emSize">Logical size of the font in DIP units. A DIP ("device-independent pixel") equals 1/96 inch.</param>
/// <param name="pixelsPerDip">Number of physical pixels per DIP. For example, if the DPI of the rendering surface is 96 this
/// value is 1.0f. If the DPI is 120, this value is 120.0f/96.</param>
/// <param name="transform">Optional transform applied to the glyphs and their positions. This transform is applied after the
/// scaling specified by the font size and pixelsPerDip.</param>
/// <param name="useGdiNatural">
/// When set to FALSE, the metrics are the same as the metrics of GDI aliased text.
/// When set to TRUE, the metrics are the same as the metrics of text measured by GDI using a font
/// created with CLEARTYPE_NATURAL_QUALITY.
/// </param>
/// <param name="glyphIndices">An array of glyph indices to compute the metrics for.</param>
/// <param name="glyphCount">The number of elements in the glyphIndices array.</param>
/// <param name="glyphMetrics">Array of DWRITE_GLYPH_METRICS structures filled by this function.
/// The metrics returned by this function are in font design units.</param>
/// <param name="isSideways">Indicates whether the font is being used in a sideways run.
/// This can affect the glyph metrics if the font has oblique simulation
/// because sideways oblique simulation differs from non-sideways oblique simulation.</param>
/// <returns>
/// Standard HRESULT error code. If any of the input glyph indices are outside of the valid glyph index range
/// for the current font face, E_INVALIDARG will be returned.
/// </returns>
FLOAT
emSize
,
FLOAT
pixelsPerDip
,
BOOL
useGdiNatural
,
UINT32
glyphCount
, };
/// <summary>
/// The font collection loader interface is used to construct a collection of fonts given a particular type of key.
/// The font collection loader interface is recommended to be implemented by a singleton object.
/// IMPORTANT: font collection loader implementations must not register themselves with a DirectWrite factory
/// inside their constructors and must not unregister themselves in their destructors, because
/// registration and unregistration operations increment and decrement the object reference count respectively.
/// Instead, registration and unregistration of font file loaders with DirectWrite factory should be performed
/// outside of the font file loader implementation as a separate step.
/// </summary>
{
/// <summary>
/// Creates a font file enumerator object that encapsulates a collection of font files.
/// The font system calls back to this interface to create a font collection.
/// </summary>
/// <param name="factory">Factory associated with the loader.</param>
/// <param name="collectionKey">Font collection key that uniquely identifies the collection of font files within
/// the scope of the font collection loader being used.</param>
/// <param name="collectionKeySize">Size of the font collection key in bytes.</param>
/// <param name="fontFileEnumerator">Pointer to the newly created font file enumerator.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
collectionKeySize
, };
/// <summary>
/// The font file enumerator interface encapsulates a collection of font files. The font system uses this interface
/// to enumerate font files when building a font collection.
/// </summary>
{
/// <summary>
/// Advances to the next font file in the collection. When it is first created, the enumerator is positioned
/// before the first element of the collection and the first call to MoveNext advances to the first file.
/// </summary>
/// <param name="hasCurrentFile">Receives the value TRUE if the enumerator advances to a file, or FALSE if
/// the enumerator advanced past the last file in the collection.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Gets a reference to the current font file.
/// </summary>
/// <param name="fontFile">Pointer to the newly created font file object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
};
/// <summary>
/// Represents a collection of strings indexed by locale name.
/// </summary>
{
/// <summary>
/// Gets the number of language/string pairs.
/// </summary>
/// <summary>
/// Gets the index of the item with the specified locale name.
/// </summary>
/// <param name="localeName">Locale name to look for.</param>
/// <param name="index">Receives the zero-based index of the locale name/string pair.</param>
/// <param name="exists">Receives TRUE if the locale name exists or FALSE if not.</param>
/// <returns>
/// Standard HRESULT error code. If the specified locale name does not exist, the return value is S_OK,
/// but *index is UINT_MAX and *exists is FALSE.
/// </returns>
/// <summary>
/// Gets the length in characters (not including the null terminator) of the locale name with the specified index.
/// </summary>
/// <param name="index">Zero-based index of the locale name.</param>
/// <param name="length">Receives the length in characters, not including the null terminator.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
index
,
/// <summary>
/// Copies the locale name with the specified index to the specified array.
/// </summary>
/// <param name="index">Zero-based index of the locale name.</param>
/// <param name="localeName">Character array that receives the locale name.</param>
/// <param name="size">Size of the array in characters. The size must include space for the terminating
/// null character.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
index
,
UINT32
size
/// <summary>
/// Gets the length in characters (not including the null terminator) of the string with the specified index.
/// </summary>
/// <param name="index">Zero-based index of the string.</param>
/// <param name="length">Receives the length in characters, not including the null terminator.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
index
,
/// <summary>
/// Copies the string with the specified index to the specified array.
/// </summary>
/// <param name="index">Zero-based index of the string.</param>
/// <param name="stringBuffer">Character array that receives the string.</param>
/// <param name="size">Size of the array in characters. The size must include space for the terminating
/// null character.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
index
,
UINT32
size
};
/// <summary>
/// The IDWriteFontCollection encapsulates a collection of font families.
/// </summary>
{
/// <summary>
/// Gets the number of font families in the collection.
/// </summary>
/// <summary>
/// Creates a font family object given a zero-based font family index.
/// </summary>
/// <param name="index">Zero-based index of the font family.</param>
/// <param name="fontFamily">Receives a pointer the newly created font family object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
index
,
/// <summary>
/// Finds the font family with the specified family name.
/// </summary>
/// <param name="familyName">Name of the font family. The name is not case-sensitive but must otherwise exactly match a family name in the collection.</param>
/// <param name="index">Receives the zero-based index of the matching font family if the family name was found or UINT_MAX otherwise.</param>
/// <param name="exists">Receives TRUE if the family name exists or FALSE otherwise.</param>
/// <returns>
/// Standard HRESULT error code. If the specified family name does not exist, the return value is S_OK, but *index is UINT_MAX and *exists is FALSE.
/// </returns>
/// <summary>
/// Gets the font object that corresponds to the same physical font as the specified font face object. The specified physical font must belong
/// to the font collection.
/// </summary>
/// <param name="fontFace">Font face object that specifies the physical font.</param>
/// <param name="font">Receives a pointer to the newly created font object if successful or NULL otherwise.</param>
/// <returns>
/// Standard HRESULT error code. If the specified physical font is not part of the font collection the return value is DWRITE_E_NOFONT.
/// </returns>
};
/// <summary>
/// The IDWriteFontList interface represents an ordered set of fonts that are part of an IDWriteFontCollection.
/// </summary>
{
/// <summary>
/// Gets the font collection that contains the fonts.
/// </summary>
/// <param name="fontCollection">Receives a pointer to the font collection object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Gets the number of fonts in the font list.
/// </summary>
/// <summary>
/// Gets a font given its zero-based index.
/// </summary>
/// <param name="index">Zero-based index of the font in the font list.</param>
/// <param name="font">Receives a pointer to the newly created font object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
index
, };
/// <summary>
/// The IDWriteFontFamily interface represents a set of fonts that share the same design but are differentiated
/// by weight, stretch, and style.
/// </summary>
{
/// <summary>
/// Creates a localized strings object that contains the family names for the font family, indexed by locale name.
/// </summary>
/// <param name="names">Receives a pointer to the newly created localized strings object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Gets the font that best matches the specified properties.
/// </summary>
/// <param name="weight">Requested font weight.</param>
/// <param name="stretch">Requested font stretch.</param>
/// <param name="style">Requested font style.</param>
/// <param name="matchingFont">Receives a pointer to the newly created font object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_FONT_WEIGHT
weight
,
DWRITE_FONT_STRETCH
stretch
,
DWRITE_FONT_STYLE
style
,
/// <summary>
/// Gets a list of fonts in the font family ranked in order of how well they match the specified properties.
/// </summary>
/// <param name="weight">Requested font weight.</param>
/// <param name="stretch">Requested font stretch.</param>
/// <param name="style">Requested font style.</param>
/// <param name="matchingFonts">Receives a pointer to the newly created font list object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_FONT_WEIGHT
weight
,
DWRITE_FONT_STRETCH
stretch
,
DWRITE_FONT_STYLE
style
, };
/// <summary>
/// The IDWriteFont interface represents a physical font in a font collection.
/// </summary>
{
/// <summary>
/// Gets the font family to which the specified font belongs.
/// </summary>
/// <param name="fontFamily">Receives a pointer to the font family object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Gets the weight of the specified font.
/// </summary>
/// <summary>
/// Gets the stretch (aka. width) of the specified font.
/// </summary>
/// <summary>
/// Gets the style (aka. slope) of the specified font.
/// </summary>
/// <summary>
/// Returns TRUE if the font is a symbol font or FALSE if not.
/// </summary>
/// <summary>
/// Gets a localized strings collection containing the face names for the font (e.g., Regular or Bold), indexed by locale name.
/// </summary>
/// <param name="names">Receives a pointer to the newly created localized strings object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Gets a localized strings collection containing the specified informational strings, indexed by locale name.
/// </summary>
/// <param name="informationalStringID">Identifies the string to get.</param>
/// <param name="informationalStrings">Receives a pointer to the newly created localized strings object.</param>
/// <param name="exists">Receives the value TRUE if the font contains the specified string ID or FALSE if not.</param>
/// <returns>
/// Standard HRESULT error code. If the font does not contain the specified string, the return value is S_OK but
/// informationalStrings receives a NULL pointer and exists receives the value FALSE.
/// </returns>
DWRITE_INFORMATIONAL_STRING_ID
informationalStringID
,
/// <summary>
/// Gets a value that indicates what simulation are applied to the specified font.
/// </summary>
/// <summary>
/// Gets the metrics for the font.
/// </summary>
/// <param name="fontMetrics">Receives the font metrics.</param>
/// <summary>
/// Determines whether the font supports the specified character.
/// </summary>
/// <param name="unicodeValue">Unicode (UCS-4) character value.</param>
/// <param name="exists">Receives the value TRUE if the font supports the specified character or FALSE if not.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
unicodeValue
,
/// <summary>
/// Creates a font face object for the font.
/// </summary>
/// <param name="fontFace">Receives a pointer to the newly created font face object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
};
/// <summary>
/// Direction for how reading progresses.
/// </summary>
enum
DWRITE_READING_DIRECTION
{
/// <summary>
/// Reading progresses from left to right.
/// </summary>
DWRITE_READING_DIRECTION_LEFT_TO_RIGHT
=
0
,
/// <summary>
/// Reading progresses from right to left.
/// </summary>
DWRITE_READING_DIRECTION_RIGHT_TO_LEFT
=
1
,
/// <summary>
/// Reading progresses from top to bottom.
/// </summary>
DWRITE_READING_DIRECTION_TOP_TO_BOTTOM
=
2
,
/// <summary>
/// Reading progresses from bottom to top.
/// </summary>
DWRITE_READING_DIRECTION_BOTTOM_TO_TOP
=
3
, };
/// <summary>
/// Direction for how lines of text are placed relative to one another.
/// </summary>
enum
DWRITE_FLOW_DIRECTION
{
/// <summary>
/// Text lines are placed from top to bottom.
/// </summary>
DWRITE_FLOW_DIRECTION_TOP_TO_BOTTOM
=
0
,
/// <summary>
/// Text lines are placed from bottom to top.
/// </summary>
DWRITE_FLOW_DIRECTION_BOTTOM_TO_TOP
=
1
,
/// <summary>
/// Text lines are placed from left to right.
/// </summary>
DWRITE_FLOW_DIRECTION_LEFT_TO_RIGHT
=
2
,
/// <summary>
/// Text lines are placed from right to left.
/// </summary>
DWRITE_FLOW_DIRECTION_RIGHT_TO_LEFT
=
3
, };
/// <summary>
/// Alignment of paragraph text along the reading direction axis relative to
/// the leading and trailing edge of the layout box.
/// </summary>
enum
DWRITE_TEXT_ALIGNMENT
{
/// <summary>
/// The leading edge of the paragraph text is aligned to the layout box's leading edge.
/// </summary>
DWRITE_TEXT_ALIGNMENT_LEADING
,
/// <summary>
/// The trailing edge of the paragraph text is aligned to the layout box's trailing edge.
/// </summary>
DWRITE_TEXT_ALIGNMENT_TRAILING
,
/// <summary>
/// The center of the paragraph text is aligned to the center of the layout box.
/// </summary>
DWRITE_TEXT_ALIGNMENT_CENTER
,
/// <summary>
/// Align text to the leading side, and also justify text to fill the lines.
/// </summary>
DWRITE_TEXT_ALIGNMENT_JUSTIFIED
};
/// <summary>
/// Alignment of paragraph text along the flow direction axis relative to the
/// flow's beginning and ending edge of the layout box.
/// </summary>
enum
DWRITE_PARAGRAPH_ALIGNMENT
{
/// <summary>
/// The first line of paragraph is aligned to the flow's beginning edge of the layout box.
/// </summary>
DWRITE_PARAGRAPH_ALIGNMENT_NEAR
,
/// <summary>
/// The last line of paragraph is aligned to the flow's ending edge of the layout box.
/// </summary>
DWRITE_PARAGRAPH_ALIGNMENT_FAR
,
/// <summary>
/// The center of the paragraph is aligned to the center of the flow of the layout box.
/// </summary>
DWRITE_PARAGRAPH_ALIGNMENT_CENTER
};
/// <summary>
/// Word wrapping in multiline paragraph.
/// </summary>
enum
DWRITE_WORD_WRAPPING
{
/// <summary>
/// Words are broken across lines to avoid text overflowing the layout box.
/// </summary>
DWRITE_WORD_WRAPPING_WRAP
=
0
,
/// <summary>
/// Words are kept within the same line even when it overflows the layout box.
/// This option is often used with scrolling to reveal overflow text.
/// </summary>
DWRITE_WORD_WRAPPING_NO_WRAP
=
1
,
/// <summary>
/// Words are broken across lines to avoid text overflowing the layout box.
/// Emergency wrapping occurs if the word is larger than the maximum width.
/// </summary>
DWRITE_WORD_WRAPPING_EMERGENCY_BREAK
=
2
,
/// <summary>
/// Only wrap whole words, never breaking words (emergency wrapping) when the
/// layout width is too small for even a single word.
/// </summary>
DWRITE_WORD_WRAPPING_WHOLE_WORD
=
3
,
/// <summary>
/// Wrap between any valid characters clusters.
/// </summary>
DWRITE_WORD_WRAPPING_CHARACTER
=
4
, };
/// <summary>
/// The method used for line spacing in layout.
/// </summary>
enum
DWRITE_LINE_SPACING_METHOD
{
/// <summary>
/// Line spacing depends solely on the content, growing to accommodate the size of fonts and inline objects.
/// </summary>
DWRITE_LINE_SPACING_METHOD_DEFAULT
,
/// <summary>
/// Lines are explicitly set to uniform spacing, regardless of contained font sizes.
/// This can be useful to avoid the uneven appearance that can occur from font fallback.
/// </summary>
DWRITE_LINE_SPACING_METHOD_UNIFORM
,
/// <summary>
/// Line spacing and baseline distances are proportional to the computed values based on the content, the size of the fonts and inline objects.
/// </summary>
DWRITE_LINE_SPACING_METHOD_PROPORTIONAL
};
/// <summary>
/// Text granularity used to trim text overflowing the layout box.
/// </summary>
enum
DWRITE_TRIMMING_GRANULARITY
{
/// <summary>
/// No trimming occurs. Text flows beyond the layout width.
/// </summary>
DWRITE_TRIMMING_GRANULARITY_NONE
,
/// <summary>
/// Trimming occurs at character cluster boundary.
/// </summary>
DWRITE_TRIMMING_GRANULARITY_CHARACTER
,
/// <summary>
/// Trimming occurs at word boundary.
/// </summary>
DWRITE_TRIMMING_GRANULARITY_WORD
};
/// <summary>
/// Typographic feature of text supplied by the font.
/// </summary>
/// <remarks>
/// Use DWRITE_MAKE_FONT_FEATURE_TAG() to create a custom one.
/// <remarks>
enum
DWRITE_FONT_FEATURE_TAG
{ };
/// <summary>
/// The DWRITE_TEXT_RANGE structure specifies a range of text positions where format is applied.
/// </summary>
struct
DWRITE_TEXT_RANGE
{
/// <summary>
/// The start text position of the range.
/// </summary>
UINT32
startPosition
;
/// <summary>
/// The number of text positions in the range.
/// </summary>
UINT32
length
; };
/// <summary>
/// The DWRITE_FONT_FEATURE structure specifies properties used to identify and execute typographic feature in the font.
/// </summary>
struct
DWRITE_FONT_FEATURE
{
/// <summary>
/// The feature OpenType name identifier.
/// </summary>
DWRITE_FONT_FEATURE_TAG
nameTag
;
/// <summary>
/// Execution parameter of the feature.
/// </summary>
/// <remarks>
/// The parameter should be non-zero to enable the feature. Once enabled, a feature can't be disabled again within
/// the same range. Features requiring a selector use this value to indicate the selector index.
/// </remarks>
UINT32
parameter
; };
/// <summary>
/// Defines a set of typographic features to be applied during shaping.
/// Notice the character range which this feature list spans is specified
/// as a separate parameter to GetGlyphs.
/// </summary>
struct
DWRITE_TYPOGRAPHIC_FEATURES
{
/// <summary>
/// Array of font features.
/// </summary>
/// <summary>
/// The number of features.
/// </summary>
UINT32
featureCount
; };
/// <summary>
/// The DWRITE_TRIMMING structure specifies the trimming option for text overflowing the layout box.
/// </summary>
struct
DWRITE_TRIMMING
{
/// <summary>
/// Text granularity of which trimming applies.
/// </summary>
DWRITE_TRIMMING_GRANULARITY
granularity
;
/// <summary>
/// Character code used as the delimiter signaling the beginning of the portion of text to be preserved,
/// most useful for path ellipsis, where the delimiter would be a slash. Leave this zero if there is no
/// delimiter.
/// </summary>
UINT32
delimiter
;
/// <summary>
/// How many occurrences of the delimiter to step back. Leave this zero if there is no delimiter.
/// </summary>
UINT32
delimiterCount
; };
/// <summary>
/// The format of text used for text layout.
/// </summary>
/// <remarks>
/// This object may not be thread-safe and it may carry the state of text format change.
/// </remarks>
{
/// <summary>
/// Set alignment option of text relative to layout box's leading and trailing edge.
/// </summary>
/// <param name="textAlignment">Text alignment option</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_TEXT_ALIGNMENT
textAlignment
/// <summary>
/// Set alignment option of paragraph relative to layout box's top and bottom edge.
/// </summary>
/// <param name="paragraphAlignment">Paragraph alignment option</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_PARAGRAPH_ALIGNMENT
paragraphAlignment
/// <summary>
/// Set word wrapping option.
/// </summary>
/// <param name="wordWrapping">Word wrapping option</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_WORD_WRAPPING
wordWrapping
/// <summary>
/// Set paragraph reading direction.
/// </summary>
/// <param name="readingDirection">Text reading direction</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// The flow direction must be perpendicular to the reading direction.
/// Setting both to a vertical direction or both to horizontal yields
/// DWRITE_E_FLOWDIRECTIONCONFLICTS when calling GetMetrics or Draw.
/// </remark>
DWRITE_READING_DIRECTION
readingDirection
/// <summary>
/// Set paragraph flow direction.
/// </summary>
/// <param name="flowDirection">Paragraph flow direction</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// The flow direction must be perpendicular to the reading direction.
/// Setting both to a vertical direction or both to horizontal yields
/// DWRITE_E_FLOWDIRECTIONCONFLICTS when calling GetMetrics or Draw.
/// </remark>
DWRITE_FLOW_DIRECTION
flowDirection
/// <summary>
/// Set incremental tab stop position.
/// </summary>
/// <param name="incrementalTabStop">The incremental tab stop value</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
FLOAT
incrementalTabStop
/// <summary>
/// Set trimming options for any trailing text exceeding the layout width
/// or for any far text exceeding the layout height.
/// </summary>
/// <param name="trimmingOptions">Text trimming options.</param>
/// <param name="trimmingSign">Application-defined omission sign. This parameter may be NULL if no trimming sign is desired.</param>
/// <remarks>
/// Any inline object can be used for the trimming sign, but CreateEllipsisTrimmingSign
/// provides a typical ellipsis symbol. Trimming is also useful vertically for hiding
/// partial lines.
/// </remarks>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Set line spacing.
/// </summary>
/// <param name="lineSpacingMethod">How to determine line height.</param>
/// <param name="lineSpacing">The line height, or rather distance between one baseline to another.</param>
/// <param name="baseline">Distance from top of line to baseline. A reasonable ratio to lineSpacing is 80%.</param>
/// <remarks>
/// For the default method, spacing depends solely on the content.
/// For uniform spacing, the given line height will override the content.
/// </remarks>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_LINE_SPACING_METHOD
lineSpacingMethod
,
FLOAT
lineSpacing
,
FLOAT
baseline
/// <summary>
/// Get alignment option of text relative to layout box's leading and trailing edge.
/// </summary>
/// <summary>
/// Get alignment option of paragraph relative to layout box's top and bottom edge.
/// </summary>
/// <summary>
/// Get word wrapping option.
/// </summary>
/// <summary>
/// Get paragraph reading direction.
/// </summary>
/// <summary>
/// Get paragraph flow direction.
/// </summary>
/// <summary>
/// Get incremental tab stop position.
/// </summary>
/// <summary>
/// Get trimming options for text overflowing the layout width.
/// </summary>
/// <param name="trimmingOptions">Text trimming options.</param>
/// <param name="trimmingSign">Trimming omission sign. This parameter may be NULL.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Get line spacing.
/// </summary>
/// <param name="lineSpacingMethod">How line height is determined.</param>
/// <param name="lineSpacing">The line height, or rather distance between one baseline to another.</param>
/// <param name="baseline">Distance from top of line to baseline.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Get the font collection.
/// </summary>
/// <param name="fontCollection">The current font collection.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Get the length of the font family name, in characters, not including the terminating NULL character.
/// </summary>
/// <summary>
/// Get a copy of the font family name.
/// </summary>
/// <param name="fontFamilyName">Character array that receives the current font family name</param>
/// <param name="nameSize">Size of the character array in character count including the terminated NULL character.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
nameSize
/// <summary>
/// Get the font weight.
/// </summary>
/// <summary>
/// Get the font style.
/// </summary>
/// <summary>
/// Get the font stretch.
/// </summary>
/// <summary>
/// Get the font em height.
/// </summary>
/// <summary>
/// Get the length of the locale name, in characters, not including the terminating NULL character.
/// </summary>
/// <summary>
/// Get a copy of the locale name.
/// </summary>
/// <param name="localeName">Character array that receives the current locale name</param>
/// <param name="nameSize">Size of the character array in character count including the terminated NULL character.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
nameSize
};
/// <summary>
/// Font typography setting.
/// </summary>
{
/// <summary>
/// Add font feature.
/// </summary>
/// <param name="fontFeature">The font feature to add.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_FONT_FEATURE
fontFeature
/// <summary>
/// Get the number of font features.
/// </summary>
/// <summary>
/// Get the font feature at the specified index.
/// </summary>
/// <param name="fontFeatureIndex">The zero-based index of the font feature to get.</param>
/// <param name="fontFeature">The font feature.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
fontFeatureIndex
, };
enum
DWRITE_SCRIPT_SHAPES
{
/// <summary>
/// No additional shaping requirement. Text is shaped with the writing system default behavior.
/// </summary>
DWRITE_SCRIPT_SHAPES_DEFAULT
=
0
,
/// <summary>
/// Text should leave no visual on display i.e. control or format control characters.
/// </summary>
DWRITE_SCRIPT_SHAPES_NO_VISUAL
=
1
};
#ifdef DEFINE_ENUM_FLAG_OPERATORS
/// <summary>
/// Association of text and its writing system script as well as some display attributes.
/// </summary>
struct
DWRITE_SCRIPT_ANALYSIS
{
/// <summary>
/// Zero-based index representation of writing system script.
/// </summary>
UINT16
script
;
/// <summary>
/// Additional shaping requirement of text.
/// </summary>
DWRITE_SCRIPT_SHAPES
shapes
; };
/// <summary>
/// Condition at the edges of inline object or text used to determine
/// line-breaking behavior.
/// </summary>
enum
DWRITE_BREAK_CONDITION
{
/// <summary>
/// Whether a break is allowed is determined by the condition of the
/// neighboring text span or inline object.
/// </summary>
DWRITE_BREAK_CONDITION_NEUTRAL
,
/// <summary>
/// A break is allowed, unless overruled by the condition of the
/// neighboring text span or inline object, either prohibited by a
/// May Not or forced by a Must.
/// </summary>
DWRITE_BREAK_CONDITION_CAN_BREAK
,
/// <summary>
/// There should be no break, unless overruled by a Must condition from
/// the neighboring text span or inline object.
/// </summary>
DWRITE_BREAK_CONDITION_MAY_NOT_BREAK
,
/// <summary>
/// The break must happen, regardless of the condition of the adjacent
/// text span or inline object.
/// </summary>
DWRITE_BREAK_CONDITION_MUST_BREAK
};
/// <summary>
/// Line breakpoint characteristics of a character.
/// </summary>
struct
DWRITE_LINE_BREAKPOINT
{
/// <summary>
/// Breaking condition before the character.
/// </summary>
UINT8
breakConditionBefore
:
2
;
/// <summary>
/// Breaking condition after the character.
/// </summary>
UINT8
breakConditionAfter
:
2
;
/// <summary>
/// The character is some form of whitespace, which may be meaningful
/// for justification.
/// </summary>
UINT8
isWhitespace
:
1
;
/// <summary>
/// The character is a soft hyphen, often used to indicate hyphenation
/// points inside words.
/// </summary>
UINT8
isSoftHyphen
:
1
;
UINT8
padding
:
2
; };
/// <summary>
/// How to apply number substitution on digits and related punctuation.
/// </summary>
enum
DWRITE_NUMBER_SUBSTITUTION_METHOD
{
/// <summary>
/// Specifies that the substitution method should be determined based
/// on LOCALE_IDIGITSUBSTITUTION value of the specified text culture.
/// </summary>
DWRITE_NUMBER_SUBSTITUTION_METHOD_FROM_CULTURE
,
/// <summary>
/// If the culture is Arabic or Farsi, specifies that the number shape
/// depend on the context. Either traditional or nominal number shape
/// are used depending on the nearest preceding strong character or (if
/// there is none) the reading direction of the paragraph.
/// </summary>
DWRITE_NUMBER_SUBSTITUTION_METHOD_CONTEXTUAL
,
/// <summary>
/// Specifies that code points 0x30-0x39 are always rendered as nominal numeral
/// shapes (ones of the European number), i.e., no substitution is performed.
/// </summary>
DWRITE_NUMBER_SUBSTITUTION_METHOD_NONE
,
/// <summary>
/// Specifies that number are rendered using the national number shape
/// as specified by the LOCALE_SNATIVEDIGITS value of the specified text culture.
/// </summary>
DWRITE_NUMBER_SUBSTITUTION_METHOD_NATIONAL
,
/// <summary>
/// Specifies that number are rendered using the traditional shape
/// for the specified culture. For most cultures, this is the same as
/// NativeNational. However, NativeNational results in Latin number
/// for some Arabic cultures, whereas this value results in Arabic
/// number for all Arabic cultures.
/// </summary>
DWRITE_NUMBER_SUBSTITUTION_METHOD_TRADITIONAL
};
/// <summary>
/// Holds the appropriate digits and numeric punctuation for a given locale.
/// </summary>
{ };
/// <summary>
/// Shaping output properties per input character.
/// </summary>
struct
DWRITE_SHAPING_TEXT_PROPERTIES
{
/// <summary>
/// This character can be shaped independently from the others
/// (usually set for the space character).
/// </summary>
UINT16
isShapedAlone
:
1
;
/// <summary>
/// Reserved for use by shaping engine.
/// </summary>
UINT16
reserved1
:
1
;
/// <summary>
/// Glyph shaping can be cut after this point without affecting shaping
/// before or after it. Otherwise, splitting a call to GetGlyphs would
/// cause a reflow of glyph advances and shapes.
/// </summary>
UINT16
canBreakShapingAfter
:
1
;
/// <summary>
/// Reserved for use by shaping engine.
/// </summary>
UINT16
reserved
:
13
; };
/// <summary>
/// Shaping output properties per output glyph.
/// </summary>
struct
DWRITE_SHAPING_GLYPH_PROPERTIES
{
/// <summary>
/// Justification class, whether to use spacing, kashidas, or
/// another method. This exists for backwards compatibility
/// with Uniscribe's SCRIPT_JUSTIFY enum.
/// </summary>
UINT16
justification
:
4
;
/// <summary>
/// Indicates glyph is the first of a cluster.
/// </summary>
UINT16
isClusterStart
:
1
;
/// <summary>
/// Glyph is a diacritic.
/// </summary>
UINT16
isDiacritic
:
1
;
/// <summary>
/// Glyph has no width, mark, ZWJ, ZWNJ, ZWSP, LRM etc.
/// This flag is not limited to just U+200B.
/// </summary>
UINT16
isZeroWidthSpace
:
1
;
/// <summary>
/// Reserved for use by shaping engine.
/// </summary>
UINT16
reserved
:
9
; };
/// <summary>
/// The interface implemented by the text analyzer's client to provide text to
/// the analyzer. It allows the separation between the logical view of text as
/// a continuous stream of characters identifiable by unique text positions,
/// and the actual memory layout of potentially discrete blocks of text in the
/// client's backing store.
///
/// If any of these callbacks returns an error, the analysis functions will
/// stop prematurely and return a callback error. Rather than return E_NOTIMPL,
/// an application should stub the method and return a constant/null and S_OK.
/// </summary>
{
/// <summary>
/// Get a block of text starting at the specified text position.
/// Returning NULL indicates the end of text - the position is after
/// the last character. This function is called iteratively for
/// each consecutive block, tying together several fragmented blocks
/// in the backing store into a virtual contiguous string.
/// </summary>
/// <param name="textPosition">First position of the piece to obtain. All
/// positions are in UTF16 code-units, not whole characters, which
/// matters when supplementary characters are used.</param>
/// <param name="textString">Address that receives a pointer to the text block
/// at the specified position.</param>
/// <param name="textLength">Number of UTF16 units of the retrieved chunk.
/// The returned length is not the length of the block, but the length
/// remaining in the block, from the given position until its end.
/// So querying for a position that is 75 positions into a 100
/// position block would return 25.</param>
/// <returns>Pointer to the first character at the given text position.
/// NULL indicates no chunk available at the specified position, either
/// because textPosition >= the entire text content length or because the
/// queried position is not mapped into the app's backing store.</returns>
/// <remarks>
/// Although apps can implement sparse textual content that only maps part of
/// the backing store, the app must map any text that is in the range passed
/// to any analysis functions.
/// </remarks>
UINT32
textPosition
,
/// <summary>
/// Get a block of text immediately preceding the specified position.
/// </summary>
/// <param name="textPosition">Position immediately after the last position of the chunk to obtain.</param>
/// <param name="textString">Address that receives a pointer to the text block
/// at the specified position.</param>
/// <param name="textLength">Number of UTF16 units of the retrieved block.
/// The length returned is from the given position to the front of
/// the block.</param>
/// <returns>Pointer to the first character at (textPosition - textLength).
/// NULL indicates no chunk available at the specified position, either
/// because textPosition == 0,the textPosition > the entire text content
/// length, or the queried position is not mapped into the app's backing
/// store.</returns>
/// <remarks>
/// Although apps can implement sparse textual content that only maps part of
/// the backing store, the app must map any text that is in the range passed
/// to any analysis functions.
/// </remarks>
UINT32
textPosition
,
/// <summary>
/// Get paragraph reading direction.
/// </summary>
/// <summary>
/// Get locale name on the range affected by it.
/// </summary>
/// <param name="textPosition">Position to get the locale name of.</param>
/// <param name="textLength">Receives the length from the given position up to the
/// next differing locale.</param>
/// <param name="localeName">Address that receives a pointer to the locale
/// at the specified position.</param>
/// <remarks>
/// The localeName pointer must remain valid until the next call or until
/// the analysis returns.
/// </remarks>
UINT32
textPosition
,
/// <summary>
/// Get number substitution on the range affected by it.
/// </summary>
/// <param name="textPosition">Position to get the number substitution of.</param>
/// <param name="textLength">Receives the length from the given position up to the
/// next differing number substitution.</param>
/// <param name="numberSubstitution">Address that receives a pointer to the number substitution
/// at the specified position.</param>
/// <remarks>
/// Any implementation should return the number substitution with an
/// incremented ref count, and the analysis will release when finished
/// with it (either before the next call or before it returns). However,
/// the sink callback may hold onto it after that.
/// </remarks>
UINT32
textPosition
, };
/// <summary>
/// The interface implemented by the text analyzer's client to receive the
/// output of a given text analysis. The Text analyzer disregards any current
/// state of the analysis sink, therefore a Set method call on a range
/// overwrites the previously set analysis result of the same range.
/// </summary>
{
/// <summary>
/// Report script analysis for the text range.
/// </summary>
/// <param name="textPosition">Starting position to report from.</param>
/// <param name="textLength">Number of UTF16 units of the reported range.</param>
/// <param name="scriptAnalysis">Script analysis of characters in range.</param>
/// <returns>
/// A successful code or error code to abort analysis.
/// </returns>
UINT32
textPosition
,
UINT32
textLength
,
/// <summary>
/// Report line-break opportunities for each character, starting from
/// the specified position.
/// </summary>
/// <param name="textPosition">Starting position to report from.</param>
/// <param name="textLength">Number of UTF16 units of the reported range.</param>
/// <param name="lineBreakpoints">Breaking conditions for each character.</param>
/// <returns>
/// A successful code or error code to abort analysis.
/// </returns>
UINT32
textPosition
,
UINT32
textLength
,
/// <summary>
/// Set bidirectional level on the range, called once per each
/// level run change (either explicit or resolved implicit).
/// </summary>
/// <param name="textPosition">Starting position to report from.</param>
/// <param name="textLength">Number of UTF16 units of the reported range.</param>
/// <param name="explicitLevel">Explicit level from embedded control codes
/// RLE/RLO/LRE/LRO/PDF, determined before any additional rules.</param>
/// <param name="resolvedLevel">Final implicit level considering the
/// explicit level and characters' natural directionality, after all
/// Bidi rules have been applied.</param>
/// <returns>
/// A successful code or error code to abort analysis.
/// </returns>
UINT32
textPosition
,
UINT32
textLength
,
UINT8
explicitLevel
,
UINT8
resolvedLevel
/// <summary>
/// Set number substitution on the range.
/// </summary>
/// <param name="textPosition">Starting position to report from.</param>
/// <param name="textLength">Number of UTF16 units of the reported range.</param>
/// <param name="numberSubstitution">The number substitution applicable to
/// the returned range of text. The sink callback may hold onto it by
/// incrementing its ref count.</param>
/// <returns>
/// A successful code or error code to abort analysis.
/// </returns>
/// <remark>
/// Unlike script and bidi analysis, where every character passed to the
/// analyzer has a result, this will only be called for those ranges where
/// substitution is applicable. For any other range, you will simply not
/// be called.
/// </remark>
UINT32
textPosition
,
UINT32
textLength
, };
/// <summary>
/// Analyzes various text properties for complex script processing.
/// </summary>
{
/// <summary>
/// Analyzes a text range for script boundaries, reading text attributes
/// from the source and reporting the Unicode script ID to the sink
/// callback SetScript.
/// </summary>
/// <param name="analysisSource">Source object to analyze.</param>
/// <param name="textPosition">Starting position within the source object.</param>
/// <param name="textLength">Length to analyze.</param>
/// <param name="analysisSink">Callback object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
textPosition
,
UINT32
textLength
,
/// <summary>
/// Analyzes a text range for script directionality, reading attributes
/// from the source and reporting levels to the sink callback SetBidiLevel.
/// </summary>
/// <param name="analysisSource">Source object to analyze.</param>
/// <param name="textPosition">Starting position within the source object.</param>
/// <param name="textLength">Length to analyze.</param>
/// <param name="analysisSink">Callback object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// While the function can handle multiple paragraphs, the text range
/// should not arbitrarily split the middle of paragraphs. Otherwise the
/// returned levels may be wrong, since the Bidi algorithm is meant to
/// apply to the paragraph as a whole.
/// </remarks>
/// <remarks>
/// Embedded control codes (LRE/LRO/RLE/RLO/PDF) are taken into account.
/// </remarks>
UINT32
textPosition
,
UINT32
textLength
,
/// <summary>
/// Analyzes a text range for spans where number substitution is applicable,
/// reading attributes from the source and reporting substitutable ranges
/// to the sink callback SetNumberSubstitution.
/// </summary>
/// <param name="analysisSource">Source object to analyze.</param>
/// <param name="textPosition">Starting position within the source object.</param>
/// <param name="textLength">Length to analyze.</param>
/// <param name="analysisSink">Callback object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// While the function can handle multiple ranges of differing number
/// substitutions, the text ranges should not arbitrarily split the
/// middle of numbers. Otherwise it will treat the numbers separately
/// and will not translate any intervening punctuation.
/// </remarks>
/// <remarks>
/// Embedded control codes (LRE/LRO/RLE/RLO/PDF) are taken into account.
/// </remarks>
UINT32
textPosition
,
UINT32
textLength
,
/// <summary>
/// Analyzes a text range for potential breakpoint opportunities, reading
/// attributes from the source and reporting breakpoint opportunities to
/// the sink callback SetLineBreakpoints.
/// </summary>
/// <param name="analysisSource">Source object to analyze.</param>
/// <param name="textPosition">Starting position within the source object.</param>
/// <param name="textLength">Length to analyze.</param>
/// <param name="analysisSink">Callback object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// While the function can handle multiple paragraphs, the text range
/// should not arbitrarily split the middle of paragraphs, unless the
/// given text span is considered a whole unit. Otherwise the
/// returned properties for the first and last characters will
/// inappropriately allow breaks.
/// </remarks>
/// <remarks>
/// Special cases include the first, last, and surrogate characters. Any
/// text span is treated as if adjacent to inline objects on either side.
/// So the rules with contingent-break opportunities are used, where the
/// edge between text and inline objects is always treated as a potential
/// break opportunity, dependent on any overriding rules of the adjacent
/// objects to prohibit or force the break (see Unicode TR #14).
/// Surrogate pairs never break between.
/// </remarks>
UINT32
textPosition
,
UINT32
textLength
,
/// <summary>
/// Parses the input text string and maps it to the set of glyphs and associated glyph data
/// according to the font and the writing system's rendering rules.
/// </summary>
/// <param name="textString">The string to convert to glyphs.</param>
/// <param name="textLength">The length of textString.</param>
/// <param name="fontFace">The font face to get glyphs from.</param>
/// <param name="isSideways">Set to true if the text is intended to be
/// drawn vertically.</param>
/// <param name="isRightToLeft">Set to TRUE for right-to-left text.</param>
/// <param name="scriptAnalysis">Script analysis result from AnalyzeScript.</param>
/// <param name="localeName">The locale to use when selecting glyphs.
/// e.g. the same character may map to different glyphs for ja-jp vs zh-chs.
/// If this is NULL then the default mapping based on the script is used.</param>
/// <param name="numberSubstitution">Optional number substitution which
/// selects the appropriate glyphs for digits and related numeric characters,
/// depending on the results obtained from AnalyzeNumberSubstitution. Passing
/// null indicates that no substitution is needed and that the digits should
/// receive nominal glyphs.</param>
/// <param name="features">An array of pointers to the sets of typographic
/// features to use in each feature range.</param>
/// <param name="featureRangeLengths">The length of each feature range, in characters.
/// The sum of all lengths should be equal to textLength.</param>
/// <param name="featureRanges">The number of feature ranges.</param>
/// <param name="maxGlyphCount">The maximum number of glyphs that can be
/// returned.</param>
/// <param name="clusterMap">The mapping from character ranges to glyph
/// ranges.</param>
/// <param name="textProps">Per-character output properties.</param>
/// <param name="glyphIndices">Output glyph indices.</param>
/// <param name="glyphProps">Per-glyph output properties.</param>
/// <param name="actualGlyphCount">The actual number of glyphs returned if
/// the call succeeds.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// Note that the mapping from characters to glyphs is, in general, many-
/// to-many. The recommended estimate for the per-glyph output buffers is
/// (3 * textLength / 2 + 16). This is not guaranteed to be sufficient.
///
/// The value of the actualGlyphCount parameter is only valid if the call
/// succeeds. In the event that maxGlyphCount is not big enough
/// E_NOT_SUFFICIENT_BUFFER, which is equivalent to HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER),
/// will be returned. The application should allocate a larger buffer and try again.
/// </remarks>
UINT32
textLength
,
BOOL
isSideways
,
BOOL
isRightToLeft
,
UINT32
featureRanges
,
UINT32
maxGlyphCount
,
/// <summary>
/// Place glyphs output from the GetGlyphs method according to the font
/// and the writing system's rendering rules.
/// </summary>
/// <param name="textString">The original string the glyphs came from.</param>
/// <param name="clusterMap">The mapping from character ranges to glyph
/// ranges. Returned by GetGlyphs.</param>
/// <param name="textProps">Per-character properties. Returned by
/// GetGlyphs.</param>
/// <param name="textLength">The length of textString.</param>
/// <param name="glyphIndices">Glyph indices. See GetGlyphs</param>
/// <param name="glyphProps">Per-glyph properties. See GetGlyphs</param>
/// <param name="glyphCount">The number of glyphs.</param>
/// <param name="fontFace">The font face the glyphs came from.</param>
/// <param name="fontEmSize">Logical font size in DIP's.</param>
/// <param name="isSideways">Set to true if the text is intended to be
/// drawn vertically.</param>
/// <param name="isRightToLeft">Set to TRUE for right-to-left text.</param>
/// <param name="scriptAnalysis">Script analysis result from AnalyzeScript.</param>
/// <param name="localeName">The locale to use when selecting glyphs.
/// e.g. the same character may map to different glyphs for ja-jp vs zh-chs.
/// If this is NULL then the default mapping based on the script is used.</param>
/// <param name="features">An array of pointers to the sets of typographic
/// features to use in each feature range.</param>
/// <param name="featureRangeLengths">The length of each feature range, in characters.
/// The sum of all lengths should be equal to textLength.</param>
/// <param name="featureRanges">The number of feature ranges.</param>
/// <param name="glyphAdvances">The advance width of each glyph.</param>
/// <param name="glyphOffsets">The offset of the origin of each glyph.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
textLength
,
UINT32
glyphCount
,
FLOAT
fontEmSize
,
BOOL
isSideways
,
BOOL
isRightToLeft
,
UINT32
featureRanges
,
/// <summary>
/// Place glyphs output from the GetGlyphs method according to the font
/// and the writing system's rendering rules.
/// </summary>
/// <param name="textString">The original string the glyphs came from.</param>
/// <param name="clusterMap">The mapping from character ranges to glyph
/// ranges. Returned by GetGlyphs.</param>
/// <param name="textProps">Per-character properties. Returned by
/// GetGlyphs.</param>
/// <param name="textLength">The length of textString.</param>
/// <param name="glyphIndices">Glyph indices. See GetGlyphs</param>
/// <param name="glyphProps">Per-glyph properties. See GetGlyphs</param>
/// <param name="glyphCount">The number of glyphs.</param>
/// <param name="fontFace">The font face the glyphs came from.</param>
/// <param name="fontEmSize">Logical font size in DIP's.</param>
/// <param name="pixelsPerDip">Number of physical pixels per DIP. For example, if the DPI of the rendering surface is 96 this
/// value is 1.0f. If the DPI is 120, this value is 120.0f/96.</param>
/// <param name="transform">Optional transform applied to the glyphs and their positions. This transform is applied after the
/// scaling specified by the font size and pixelsPerDip.</param>
/// <param name="useGdiNatural">
/// When set to FALSE, the metrics are the same as the metrics of GDI aliased text.
/// When set to TRUE, the metrics are the same as the metrics of text measured by GDI using a font
/// created with CLEARTYPE_NATURAL_QUALITY.
/// </param>
/// <param name="isSideways">Set to true if the text is intended to be
/// drawn vertically.</param>
/// <param name="isRightToLeft">Set to TRUE for right-to-left text.</param>
/// <param name="scriptAnalysis">Script analysis result from AnalyzeScript.</param>
/// <param name="localeName">The locale to use when selecting glyphs.
/// e.g. the same character may map to different glyphs for ja-jp vs zh-chs.
/// If this is NULL then the default mapping based on the script is used.</param>
/// <param name="features">An array of pointers to the sets of typographic
/// features to use in each feature range.</param>
/// <param name="featureRangeLengths">The length of each feature range, in characters.
/// The sum of all lengths should be equal to textLength.</param>
/// <param name="featureRanges">The number of feature ranges.</param>
/// <param name="glyphAdvances">The advance width of each glyph.</param>
/// <param name="glyphOffsets">The offset of the origin of each glyph.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
textLength
,
UINT32
glyphCount
,
FLOAT
fontEmSize
,
FLOAT
pixelsPerDip
,
BOOL
useGdiNatural
,
BOOL
isSideways
,
BOOL
isRightToLeft
,
UINT32
featureRanges
, };
/// <summary>
/// The DWRITE_GLYPH_RUN structure contains the information needed by renderers
/// to draw glyph runs. All coordinates are in device independent pixels (DIPs).
/// </summary>
struct
DWRITE_GLYPH_RUN
{
/// <summary>
/// The physical font face to draw with.
/// </summary>
/// <summary>
/// Logical size of the font in DIPs, not points (equals 1/96 inch).
/// </summary>
FLOAT
fontEmSize
;
/// <summary>
/// The number of glyphs.
/// </summary>
UINT32
glyphCount
;
/// <summary>
/// The indices to render.
/// </summary>
/// <summary>
/// Glyph advance widths.
/// </summary>
/// <summary>
/// Glyph offsets.
/// </summary>
/// <summary>
/// If true, specifies that glyphs are rotated 90 degrees to the left and
/// vertical metrics are used. Vertical writing is achieved by specifying
/// isSideways = true and rotating the entire run 90 degrees to the right
/// via a rotate transform.
/// </summary>
BOOL
isSideways
;
/// <summary>
/// The implicit resolved bidi level of the run. Odd levels indicate
/// right-to-left languages like Hebrew and Arabic, while even levels
/// indicate left-to-right languages like English and Japanese (when
/// written horizontally). For right-to-left languages, the text origin
/// is on the right, and text should be drawn to the left.
/// </summary>
UINT32
bidiLevel
; };
/// <summary>
/// The DWRITE_GLYPH_RUN_DESCRIPTION structure contains additional properties
/// related to those in DWRITE_GLYPH_RUN.
/// </summary>
struct
DWRITE_GLYPH_RUN_DESCRIPTION
{
/// <summary>
/// The locale name associated with this run.
/// </summary>
/// <summary>
/// The text associated with the glyphs.
/// </summary>
/// <summary>
/// The number of characters (UTF16 code-units).
/// Note that this may be different than the number of glyphs.
/// </summary>
UINT32
stringLength
;
/// <summary>
/// An array of indices to the glyph indices array, of the first glyphs of
/// all the glyph clusters of the glyphs to render.
/// </summary>
/// <summary>
/// Corresponding text position in the original string
/// this glyph run came from.
/// </summary>
UINT32
textPosition
; };
/// <summary>
/// The DWRITE_UNDERLINE structure contains information about the size and
/// placement of underlines. All coordinates are in device independent
/// pixels (DIPs).
/// </summary>
struct
DWRITE_UNDERLINE
{
/// <summary>
/// Width of the underline, measured parallel to the baseline.
/// </summary>
FLOAT
width
;
/// <summary>
/// Thickness of the underline, measured perpendicular to the
/// baseline.
/// </summary>
FLOAT
thickness
;
/// <summary>
/// Offset of the underline from the baseline.
/// A positive offset represents a position below the baseline and
/// a negative offset is above.
/// </summary>
FLOAT
offset
;
/// <summary>
/// Height of the tallest run where the underline applies.
/// </summary>
FLOAT
runHeight
;
/// <summary>
/// Reading direction of the text associated with the underline. This
/// value is used to interpret whether the width value runs horizontally
/// or vertically.
/// </summary>
DWRITE_READING_DIRECTION
readingDirection
;
/// <summary>
/// Flow direction of the text associated with the underline. This value
/// is used to interpret whether the thickness value advances top to
/// bottom, left to right, or right to left.
/// </summary>
DWRITE_FLOW_DIRECTION
flowDirection
;
/// <summary>
/// Locale of the text the underline is being drawn under. Can be
/// pertinent where the locale affects how the underline is drawn.
/// For example, in vertical text, the underline belongs on the
/// left for Chinese but on the right for Japanese.
/// This choice is completely left up to higher levels.
/// </summary>
/// <summary>
/// The measuring mode can be useful to the renderer to determine how
/// underlines are rendered, e.g. rounding the thickness to a whole pixel
/// in GDI-compatible modes.
/// </summary>
DWRITE_MEASURING_MODE
measuringMode
; };
/// <summary>
/// The DWRITE_STRIKETHROUGH structure contains information about the size and
/// placement of strikethroughs. All coordinates are in device independent
/// pixels (DIPs).
/// </summary>
struct
DWRITE_STRIKETHROUGH
{
/// <summary>
/// Width of the strikethrough, measured parallel to the baseline.
/// </summary>
FLOAT
width
;
/// <summary>
/// Thickness of the strikethrough, measured perpendicular to the
/// baseline.
/// </summary>
FLOAT
thickness
;
/// <summary>
/// Offset of the strikethrough from the baseline.
/// A positive offset represents a position below the baseline and
/// a negative offset is above.
/// </summary>
FLOAT
offset
;
/// <summary>
/// Reading direction of the text associated with the strikethrough. This
/// value is used to interpret whether the width value runs horizontally
/// or vertically.
/// </summary>
DWRITE_READING_DIRECTION
readingDirection
;
/// <summary>
/// Flow direction of the text associated with the strikethrough. This
/// value is used to interpret whether the thickness value advances top to
/// bottom, left to right, or right to left.
/// </summary>
DWRITE_FLOW_DIRECTION
flowDirection
;
/// <summary>
/// Locale of the range. Can be pertinent where the locale affects the style.
/// </summary>
/// <summary>
/// The measuring mode can be useful to the renderer to determine how
/// underlines are rendered, e.g. rounding the thickness to a whole pixel
/// in GDI-compatible modes.
/// </summary>
DWRITE_MEASURING_MODE
measuringMode
; };
/// <summary>
/// The DWRITE_LINE_METRICS structure contains information about a formatted
/// line of text.
/// </summary>
struct
DWRITE_LINE_METRICS
{
/// <summary>
/// The number of total text positions in the line.
/// This includes any trailing whitespace and newline characters.
/// </summary>
UINT32
length
;
/// <summary>
/// The number of whitespace positions at the end of the line. Newline
/// sequences are considered whitespace.
/// </summary>
UINT32
trailingWhitespaceLength
;
/// <summary>
/// The number of characters in the newline sequence at the end of the line.
/// If the count is zero, then the line was either wrapped or it is the
/// end of the text.
/// </summary>
UINT32
newlineLength
;
/// <summary>
/// Height of the line as measured from top to bottom.
/// </summary>
FLOAT
height
;
/// <summary>
/// Distance from the top of the line to its baseline.
/// </summary>
FLOAT
baseline
;
/// <summary>
/// The line is trimmed.
/// </summary>
BOOL
isTrimmed
; };
/// <summary>
/// The DWRITE_CLUSTER_METRICS structure contains information about a glyph cluster.
/// </summary>
struct
DWRITE_CLUSTER_METRICS
{
/// <summary>
/// The total advance width of all glyphs in the cluster.
/// </summary>
FLOAT
width
;
/// <summary>
/// The number of text positions in the cluster.
/// </summary>
UINT16
length
;
/// <summary>
/// Indicate whether line can be broken right after the cluster.
/// </summary>
UINT16
canWrapLineAfter
:
1
;
/// <summary>
/// Indicate whether the cluster corresponds to whitespace character.
/// </summary>
UINT16
isWhitespace
:
1
;
/// <summary>
/// Indicate whether the cluster corresponds to a newline character.
/// </summary>
UINT16
isNewline
:
1
;
/// <summary>
/// Indicate whether the cluster corresponds to soft hyphen character.
/// </summary>
UINT16
isSoftHyphen
:
1
;
/// <summary>
/// Indicate whether the cluster is read from right to left.
/// </summary>
UINT16
isRightToLeft
:
1
;
UINT16
padding
:
11
; };
/// <summary>
/// Overall metrics associated with text after layout.
/// All coordinates are in device independent pixels (DIPs).
/// </summary>
struct
DWRITE_TEXT_METRICS
{
/// <summary>
/// Left-most point of formatted text relative to layout box
/// (excluding any glyph overhang).
/// </summary>
FLOAT
left
;
/// <summary>
/// Top-most point of formatted text relative to layout box
/// (excluding any glyph overhang).
/// </summary>
FLOAT
top
;
/// <summary>
/// The width of the formatted text ignoring trailing whitespace
/// at the end of each line.
/// </summary>
FLOAT
width
;
/// <summary>
/// The width of the formatted text taking into account the
/// trailing whitespace at the end of each line.
/// </summary>
FLOAT
widthIncludingTrailingWhitespace
;
/// <summary>
/// The height of the formatted text. The height of an empty string
/// is determined by the size of the default font's line height.
/// </summary>
FLOAT
height
;
/// <summary>
/// Initial width given to the layout. Depending on whether the text
/// was wrapped or not, it can be either larger or smaller than the
/// text content width.
/// </summary>
FLOAT
layoutWidth
;
/// <summary>
/// Initial height given to the layout. Depending on the length of the
/// text, it may be larger or smaller than the text content height.
/// </summary>
FLOAT
layoutHeight
;
/// <summary>
/// The maximum reordering count of any line of text, used
/// to calculate the most number of hit-testing boxes needed.
/// If the layout has no bidirectional text or no text at all,
/// the minimum level is 1.
/// </summary>
UINT32
maxBidiReorderingDepth
;
/// <summary>
/// Total number of lines.
/// </summary>
UINT32
lineCount
; };
/// <summary>
/// Properties describing the geometric measurement of an
/// application-defined inline object.
/// </summary>
struct
DWRITE_INLINE_OBJECT_METRICS
{
/// <summary>
/// Width of the inline object.
/// </summary>
FLOAT
width
;
/// <summary>
/// Height of the inline object as measured from top to bottom.
/// </summary>
FLOAT
height
;
/// <summary>
/// Distance from the top of the object to the baseline where it is lined up with the adjacent text.
/// If the baseline is at the bottom, baseline simply equals height.
/// </summary>
FLOAT
baseline
;
/// <summary>
/// Flag indicating whether the object is to be placed upright or alongside the text baseline
/// for vertical text.
/// </summary>
BOOL
supportsSideways
; };
/// <summary>
/// The DWRITE_OVERHANG_METRICS structure holds how much any visible pixels
/// (in DIPs) overshoot each side of the layout or inline objects.
/// </summary>
/// <remarks>
/// Positive overhangs indicate that the visible area extends outside the layout
/// box or inline object, while negative values mean there is whitespace inside.
/// The returned values are unaffected by rendering transforms or pixel snapping.
/// Additionally, they may not exactly match final target's pixel bounds after
/// applying grid fitting and hinting.
/// </remarks>
struct
DWRITE_OVERHANG_METRICS
{
/// <summary>
/// The distance from the left-most visible DIP to its left alignment edge.
/// </summary>
FLOAT
left
;
/// <summary>
/// The distance from the top-most visible DIP to its top alignment edge.
/// </summary>
FLOAT
top
;
/// <summary>
/// The distance from the right-most visible DIP to its right alignment edge.
/// </summary>
FLOAT
right
;
/// <summary>
/// The distance from the bottom-most visible DIP to its bottom alignment edge.
/// </summary>
FLOAT
bottom
; };
/// <summary>
/// Geometry enclosing of text positions.
/// </summary>
struct
DWRITE_HIT_TEST_METRICS
{
/// <summary>
/// First text position within the geometry.
/// </summary>
UINT32
textPosition
;
/// <summary>
/// Number of text positions within the geometry.
/// </summary>
UINT32
length
;
/// <summary>
/// Left position of the top-left coordinate of the geometry.
/// </summary>
FLOAT
left
;
/// <summary>
/// Top position of the top-left coordinate of the geometry.
/// </summary>
FLOAT
top
;
/// <summary>
/// Geometry's width.
/// </summary>
FLOAT
width
;
/// <summary>
/// Geometry's height.
/// </summary>
FLOAT
height
;
/// <summary>
/// Bidi level of text positions enclosed within the geometry.
/// </summary>
UINT32
bidiLevel
;
/// <summary>
/// Geometry encloses text?
/// </summary>
BOOL
isText
;
/// <summary>
/// Range is trimmed.
/// </summary>
BOOL
isTrimmed
; };
/// <summary>
/// The IDWriteInlineObject interface wraps an application defined inline graphic,
/// allowing DWrite to query metrics as if it was a glyph inline with the text.
/// </summary>
{
/// <summary>
/// The application implemented rendering callback (IDWriteTextRenderer::DrawInlineObject)
/// can use this to draw the inline object without needing to cast or query the object
/// type. The text layout does not call this method directly.
/// </summary>
/// <param name="clientDrawingContext">The context passed to IDWriteTextLayout::Draw.</param>
/// <param name="renderer">The renderer passed to IDWriteTextLayout::Draw as the object's containing parent.</param>
/// <param name="originX">X-coordinate at the top-left corner of the inline object.</param>
/// <param name="originY">Y-coordinate at the top-left corner of the inline object.</param>
/// <param name="isSideways">The object should be drawn on its side.</param>
/// <param name="isRightToLeft">The object is in an right-to-left context and should be drawn flipped.</param>
/// <param name="clientDrawingEffect">The drawing effect set in IDWriteTextLayout::SetDrawingEffect.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
FLOAT
originX
,
FLOAT
originY
,
BOOL
isSideways
,
BOOL
isRightToLeft
,
/// <summary>
/// TextLayout calls this callback function to get the measurement of the inline object.
/// </summary>
/// <param name="metrics">Returned metrics</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// TextLayout calls this callback function to get the visible extents (in DIPs) of the inline object.
/// In the case of a simple bitmap, with no padding and no overhang, all the overhangs will
/// simply be zeroes.
/// </summary>
/// <param name="overhangs">Overshoot of visible extents (in DIPs) outside the object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// The overhangs should be returned relative to the reported size of the object
/// (DWRITE_INLINE_OBJECT_METRICS::width/height), and should not be baseline
/// adjusted. If you have an image that is actually 100x100 DIPs, but you want it
/// slightly inset (perhaps it has a glow) by 20 DIPs on each side, you would
/// return a width/height of 60x60 and four overhangs of 20 DIPs.
/// </remarks>
/// <summary>
/// Layout uses this to determine the line breaking behavior of the inline object
/// amidst the text.
/// </summary>
/// <param name="breakConditionBefore">Line-breaking condition between the object and the content immediately preceding it.</param>
/// <param name="breakConditionAfter" >Line-breaking condition between the object and the content immediately following it.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
};
/// <summary>
/// The IDWritePixelSnapping interface defines the pixel snapping properties of a text renderer.
/// </summary>
{
/// <summary>
/// Determines whether pixel snapping is disabled. The recommended default is FALSE,
/// unless doing animation that requires subpixel vertical placement.
/// </summary>
/// <param name="clientDrawingContext">The context passed to IDWriteTextLayout::Draw.</param>
/// <param name="isDisabled">Receives TRUE if pixel snapping is disabled or FALSE if it not.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Gets the current transform that maps abstract coordinates to DIPs,
/// which may disable pixel snapping upon any rotation or shear.
/// </summary>
/// <param name="clientDrawingContext">The context passed to IDWriteTextLayout::Draw.</param>
/// <param name="transform">Receives the transform.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Gets the number of physical pixels per DIP. A DIP (device-independent pixel) is 1/96 inch,
/// so the pixelsPerDip value is the number of logical pixels per inch divided by 96 (yielding
/// a value of 1 for 96 DPI and 1.25 for 120).
/// </summary>
/// <param name="clientDrawingContext">The context passed to IDWriteTextLayout::Draw.</param>
/// <param name="pixelsPerDip">Receives the number of physical pixels per DIP.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
};
/// <summary>
/// The IDWriteTextRenderer interface represents a set of application-defined
/// callbacks that perform rendering of text, inline objects, and decorations
/// such as underlines.
/// </summary>
{
/// <summary>
/// IDWriteTextLayout::Draw calls this function to instruct the client to
/// render a run of glyphs.
/// </summary>
/// <param name="clientDrawingContext">The context passed to
/// IDWriteTextLayout::Draw.</param>
/// <param name="baselineOriginX">X-coordinate of the baseline.</param>
/// <param name="baselineOriginY">Y-coordinate of the baseline.</param>
/// <param name="measuringMode">Specifies measuring mode for glyphs in the run.
/// Renderer implementations may choose different rendering modes for given measuring modes,
/// but best results are seen when the rendering mode matches the corresponding measuring mode:
/// DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL for DWRITE_MEASURING_MODE_NATURAL
/// DWRITE_RENDERING_MODE_CLEARTYPE_GDI_CLASSIC for DWRITE_MEASURING_MODE_GDI_CLASSIC
/// DWRITE_RENDERING_MODE_CLEARTYPE_GDI_NATURAL for DWRITE_MEASURING_MODE_GDI_NATURAL
/// </param>
/// <param name="glyphRun">The glyph run to draw.</param>
/// <param name="glyphRunDescription">Properties of the characters
/// associated with this run.</param>
/// <param name="clientDrawingEffect">The drawing effect set in
/// IDWriteTextLayout::SetDrawingEffect.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
FLOAT
baselineOriginX
,
FLOAT
baselineOriginY
,
DWRITE_MEASURING_MODE
measuringMode
,
/// <summary>
/// IDWriteTextLayout::Draw calls this function to instruct the client to draw
/// an underline.
/// </summary>
/// <param name="clientDrawingContext">The context passed to
/// IDWriteTextLayout::Draw.</param>
/// <param name="baselineOriginX">X-coordinate of the baseline.</param>
/// <param name="baselineOriginY">Y-coordinate of the baseline.</param>
/// <param name="underline">Underline logical information.</param>
/// <param name="clientDrawingEffect">The drawing effect set in
/// IDWriteTextLayout::SetDrawingEffect.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// A single underline can be broken into multiple calls, depending on
/// how the formatting changes attributes. If font sizes/styles change
/// within an underline, the thickness and offset will be averaged
/// weighted according to characters.
/// To get the correct top coordinate of the underline rect, add underline::offset
/// to the baseline's Y. Otherwise the underline will be immediately under the text.
/// The x coordinate will always be passed as the left side, regardless
/// of text directionality. This simplifies drawing and reduces the
/// problem of round-off that could potentially cause gaps or a double
/// stamped alpha blend. To avoid alpha overlap, round the end points
/// to the nearest device pixel.
/// </remarks>
FLOAT
baselineOriginX
,
FLOAT
baselineOriginY
,
/// <summary>
/// IDWriteTextLayout::Draw calls this function to instruct the client to draw
/// a strikethrough.
/// </summary>
/// <param name="clientDrawingContext">The context passed to
/// IDWriteTextLayout::Draw.</param>
/// <param name="baselineOriginX">X-coordinate of the baseline.</param>
/// <param name="baselineOriginY">Y-coordinate of the baseline.</param>
/// <param name="strikethrough">Strikethrough logical information.</param>
/// <param name="clientDrawingEffect">The drawing effect set in
/// IDWriteTextLayout::SetDrawingEffect.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// A single strikethrough can be broken into multiple calls, depending on
/// how the formatting changes attributes. Strikethrough is not averaged
/// across font sizes/styles changes.
/// To get the correct top coordinate of the strikethrough rect,
/// add strikethrough::offset to the baseline's Y.
/// Like underlines, the x coordinate will always be passed as the left side,
/// regardless of text directionality.
/// </remarks>
FLOAT
baselineOriginX
,
FLOAT
baselineOriginY
,
/// <summary>
/// IDWriteTextLayout::Draw calls this application callback when it needs to
/// draw an inline object.
/// </summary>
/// <param name="clientDrawingContext">The context passed to IDWriteTextLayout::Draw.</param>
/// <param name="originX">X-coordinate at the top-left corner of the inline object.</param>
/// <param name="originY">Y-coordinate at the top-left corner of the inline object.</param>
/// <param name="inlineObject">The object set using IDWriteTextLayout::SetInlineObject.</param>
/// <param name="isSideways">The object should be drawn on its side.</param>
/// <param name="isRightToLeft">The object is in an right-to-left context and should be drawn flipped.</param>
/// <param name="clientDrawingEffect">The drawing effect set in
/// IDWriteTextLayout::SetDrawingEffect.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// The right-to-left flag is a hint for those cases where it would look
/// strange for the image to be shown normally (like an arrow pointing to
/// right to indicate a submenu).
/// </remarks>
FLOAT
originX
,
FLOAT
originY
,
BOOL
isSideways
,
BOOL
isRightToLeft
, };
/// <summary>
/// The IDWriteTextLayout interface represents a block of text after it has
/// been fully analyzed and formatted.
///
/// All coordinates are in device independent pixels (DIPs).
/// </summary>
{
/// <summary>
/// Set layout maximum width
/// </summary>
/// <param name="maxWidth">Layout maximum width</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
FLOAT
maxWidth
/// <summary>
/// Set layout maximum height
/// </summary>
/// <param name="maxHeight">Layout maximum height</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
FLOAT
maxHeight
/// <summary>
/// Set the font collection.
/// </summary>
/// <param name="fontCollection">The font collection to set</param>
/// <param name="textRange">Text range to which this change applies.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_TEXT_RANGE
textRange
/// <summary>
/// Set null-terminated font family name.
/// </summary>
/// <param name="fontFamilyName">Font family name</param>
/// <param name="textRange">Text range to which this change applies.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_TEXT_RANGE
textRange
/// <summary>
/// Set font weight.
/// </summary>
/// <param name="fontWeight">Font weight</param>
/// <param name="textRange">Text range to which this change applies.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_FONT_WEIGHT
fontWeight
,
DWRITE_TEXT_RANGE
textRange
/// <summary>
/// Set font style.
/// </summary>
/// <param name="fontStyle">Font style</param>
/// <param name="textRange">Text range to which this change applies.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_FONT_STYLE
fontStyle
,
DWRITE_TEXT_RANGE
textRange
/// <summary>
/// Set font stretch.
/// </summary>
/// <param name="fontStretch">font stretch</param>
/// <param name="textRange">Text range to which this change applies.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_FONT_STRETCH
fontStretch
,
DWRITE_TEXT_RANGE
textRange
/// <summary>
/// Set font em height.
/// </summary>
/// <param name="fontSize">Font em height</param>
/// <param name="textRange">Text range to which this change applies.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
FLOAT
fontSize
,
DWRITE_TEXT_RANGE
textRange
/// <summary>
/// Set underline.
/// </summary>
/// <param name="hasUnderline">The Boolean flag indicates whether underline takes place</param>
/// <param name="textRange">Text range to which this change applies.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
BOOL
hasUnderline
,
DWRITE_TEXT_RANGE
textRange
/// <summary>
/// Set strikethrough.
/// </summary>
/// <param name="hasStrikethrough">The Boolean flag indicates whether strikethrough takes place</param>
/// <param name="textRange">Text range to which this change applies.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
BOOL
hasStrikethrough
,
DWRITE_TEXT_RANGE
textRange
/// <summary>
/// Set application-defined drawing effect.
/// </summary>
/// <param name="drawingEffect">Pointer to an application-defined drawing effect.</param>
/// <param name="textRange">Text range to which this change applies.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// This drawing effect is associated with the specified range and will be passed back
/// to the application via the callback when the range is drawn at drawing time.
/// </remarks>
IUnknown
*
drawingEffect
,
DWRITE_TEXT_RANGE
textRange
/// <summary>
/// Set inline object.
/// </summary>
/// <param name="inlineObject">Pointer to an application-implemented inline object.</param>
/// <param name="textRange">Text range to which this change applies.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// This inline object applies to the specified range and will be passed back
/// to the application via the DrawInlineObject callback when the range is drawn.
/// Any text in that range will be suppressed.
/// </remarks>
DWRITE_TEXT_RANGE
textRange
/// <summary>
/// Set font typography features.
/// </summary>
/// <param name="typography">Pointer to font typography setting.</param>
/// <param name="textRange">Text range to which this change applies.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_TEXT_RANGE
textRange
/// <summary>
/// Set locale name.
/// </summary>
/// <param name="localeName">Locale name</param>
/// <param name="textRange">Text range to which this change applies.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_TEXT_RANGE
textRange
/// <summary>
/// Get layout maximum width
/// </summary>
/// <summary>
/// Get layout maximum height
/// </summary>
/// <summary>
/// Get the font collection where the current position is at.
/// </summary>
/// <param name="currentPosition">The current text position.</param>
/// <param name="fontCollection">The current font collection</param>
/// <param name="textRange">Text range to which this change applies.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
currentPosition
,
/// <summary>
/// Get the length of the font family name where the current position is at.
/// </summary>
/// <param name="currentPosition">The current text position.</param>
/// <param name="nameLength">Size of the character array in character count not including the terminated NULL character.</param>
/// <param name="textRange">The position range of the current format.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
currentPosition
,
/// <summary>
/// Copy the font family name where the current position is at.
/// </summary>
/// <param name="currentPosition">The current text position.</param>
/// <param name="fontFamilyName">Character array that receives the current font family name</param>
/// <param name="nameSize">Size of the character array in character count including the terminated NULL character.</param>
/// <param name="textRange">The position range of the current format.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
currentPosition
,
UINT32
nameSize
,
/// <summary>
/// Get the font weight where the current position is at.
/// </summary>
/// <param name="currentPosition">The current text position.</param>
/// <param name="fontWeight">The current font weight</param>
/// <param name="textRange">The position range of the current format.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
currentPosition
,
/// <summary>
/// Get the font style where the current position is at.
/// </summary>
/// <param name="currentPosition">The current text position.</param>
/// <param name="fontStyle">The current font style</param>
/// <param name="textRange">The position range of the current format.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
currentPosition
,
/// <summary>
/// Get the font stretch where the current position is at.
/// </summary>
/// <param name="currentPosition">The current text position.</param>
/// <param name="fontStretch">The current font stretch</param>
/// <param name="textRange">The position range of the current format.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
currentPosition
,
/// <summary>
/// Get the font em height where the current position is at.
/// </summary>
/// <param name="currentPosition">The current text position.</param>
/// <param name="fontSize">The current font em height</param>
/// <param name="textRange">The position range of the current format.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
currentPosition
,
/// <summary>
/// Get the underline presence where the current position is at.
/// </summary>
/// <param name="currentPosition">The current text position.</param>
/// <param name="hasUnderline">The Boolean flag indicates whether text is underlined.</param>
/// <param name="textRange">The position range of the current format.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
currentPosition
,
/// <summary>
/// Get the strikethrough presence where the current position is at.
/// </summary>
/// <param name="currentPosition">The current text position.</param>
/// <param name="hasStrikethrough">The Boolean flag indicates whether text has strikethrough.</param>
/// <param name="textRange">The position range of the current format.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
currentPosition
,
/// <summary>
/// Get the application-defined drawing effect where the current position is at.
/// </summary>
/// <param name="currentPosition">The current text position.</param>
/// <param name="drawingEffect">The current application-defined drawing effect.</param>
/// <param name="textRange">The position range of the current format.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
currentPosition
,
/// <summary>
/// Get the inline object at the given position.
/// </summary>
/// <param name="currentPosition">The given text position.</param>
/// <param name="inlineObject">The inline object.</param>
/// <param name="textRange">The position range of the current format.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
currentPosition
,
/// <summary>
/// Get the typography setting where the current position is at.
/// </summary>
/// <param name="currentPosition">The current text position.</param>
/// <param name="typography">The current typography setting.</param>
/// <param name="textRange">The position range of the current format.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
currentPosition
,
/// <summary>
/// Get the length of the locale name where the current position is at.
/// </summary>
/// <param name="currentPosition">The current text position.</param>
/// <param name="nameLength">Size of the character array in character count not including the terminated NULL character.</param>
/// <param name="textRange">The position range of the current format.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
currentPosition
,
/// <summary>
/// Get the locale name where the current position is at.
/// </summary>
/// <param name="currentPosition">The current text position.</param>
/// <param name="localeName">Character array that receives the current locale name</param>
/// <param name="nameSize">Size of the character array in character count including the terminated NULL character.</param>
/// <param name="textRange">The position range of the current format.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
currentPosition
,
UINT32
nameSize
,
/// <summary>
/// Initiate drawing of the text.
/// </summary>
/// <param name="clientDrawingContext">An application defined value
/// included in rendering callbacks.</param>
/// <param name="renderer">The set of application-defined callbacks that do
/// the actual rendering.</param>
/// <param name="originX">X-coordinate of the layout's left side.</param>
/// <param name="originY">Y-coordinate of the layout's top side.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
FLOAT
originX
,
FLOAT
originY
/// <summary>
/// GetLineMetrics returns properties of each line.
/// </summary>
/// <param name="lineMetrics">The array to fill with line information.</param>
/// <param name="maxLineCount">The maximum size of the lineMetrics array.</param>
/// <param name="actualLineCount">The actual size of the lineMetrics
/// array that is needed.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// If maxLineCount is not large enough E_NOT_SUFFICIENT_BUFFER,
/// which is equivalent to HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER),
/// is returned and *actualLineCount is set to the number of lines
/// needed.
/// </remarks>
UINT32
maxLineCount
,
/// <summary>
/// GetMetrics retrieves overall metrics for the formatted string.
/// </summary>
/// <param name="textMetrics">The returned metrics.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// Drawing effects like underline and strikethrough do not contribute
/// to the text size, which is essentially the sum of advance widths and
/// line heights. Additionally, visible swashes and other graphic
/// adornments may extend outside the returned width and height.
/// </remarks>
/// <summary>
/// GetOverhangMetrics returns the overhangs (in DIPs) of the layout and all
/// objects contained in it, including text glyphs and inline objects.
/// </summary>
/// <param name="overhangs">Overshoots of visible extents (in DIPs) outside the layout.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// Any underline and strikethrough do not contribute to the black box
/// determination, since these are actually drawn by the renderer, which
/// is allowed to draw them in any variety of styles.
/// </remarks>
/// <summary>
/// Retrieve logical properties and measurement of each cluster.
/// </summary>
/// <param name="clusterMetrics">The array to fill with cluster information.</param>
/// <param name="maxClusterCount">The maximum size of the clusterMetrics array.</param>
/// <param name="actualClusterCount">The actual size of the clusterMetrics array that is needed.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// If maxClusterCount is not large enough E_NOT_SUFFICIENT_BUFFER,
/// which is equivalent to HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER),
/// is returned and *actualClusterCount is set to the number of clusters
/// needed.
/// </remarks>
UINT32
maxClusterCount
,
/// <summary>
/// Determines the minimum possible width the layout can be set to without
/// emergency breaking between the characters of whole words.
/// </summary>
/// <param name="minWidth">Minimum width.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Given a coordinate (in DIPs) relative to the top-left of the layout box,
/// this returns the corresponding hit-test metrics of the text string where
/// the hit-test has occurred. This is useful for mapping mouse clicks to caret
/// positions. When the given coordinate is outside the text string, the function
/// sets the output value *isInside to false but returns the nearest character
/// position.
/// </summary>
/// <param name="pointX">X coordinate to hit-test, relative to the top-left location of the layout box.</param>
/// <param name="pointY">Y coordinate to hit-test, relative to the top-left location of the layout box.</param>
/// <param name="isTrailingHit">Output flag indicating whether the hit-test location is at the leading or the trailing
/// side of the character. When the output *isInside value is set to false, this value is set according to the output
/// *position value to represent the edge closest to the hit-test location. </param>
/// <param name="isInside">Output flag indicating whether the hit-test location is inside the text string.
/// When false, the position nearest the text's edge is returned.</param>
/// <param name="hitTestMetrics">Output geometry fully enclosing the hit-test location. When the output *isInside value
/// is set to false, this structure represents the geometry enclosing the edge closest to the hit-test location.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
FLOAT
pointX
,
FLOAT
pointY
,
/// <summary>
/// Given a text position and whether the caret is on the leading or trailing
/// edge of that position, this returns the corresponding coordinate (in DIPs)
/// relative to the top-left of the layout box. This is most useful for drawing
/// the caret's current position, but it could also be used to anchor an IME to the
/// typed text or attach a floating menu near the point of interest. It may also be
/// used to programmatically obtain the geometry of a particular text position
/// for UI automation.
/// </summary>
/// <param name="textPosition">Text position to get the coordinate of.</param>
/// <param name="isTrailingHit">Flag indicating whether the location is of the leading or the trailing side of the specified text position. </param>
/// <param name="pointX">Output caret X, relative to the top-left of the layout box.</param>
/// <param name="pointY">Output caret Y, relative to the top-left of the layout box.</param>
/// <param name="hitTestMetrics">Output geometry fully enclosing the specified text position.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// When drawing a caret at the returned X,Y, it should be centered on X
/// and drawn from the Y coordinate down. The height will be the size of the
/// hit-tested text (which can vary in size within a line).
/// Reading direction also affects which side of the character the caret is drawn.
/// However, the returned X coordinate will be correct for either case.
/// You can get a text length back that is larger than a single character.
/// This happens for complex scripts when multiple characters form a single cluster,
/// when diacritics join their base character, or when you test a surrogate pair.
/// </remarks>
UINT32
textPosition
,
BOOL
isTrailingHit
,
/// <summary>
/// The application calls this function to get a set of hit-test metrics
/// corresponding to a range of text positions. The main usage for this
/// is to draw highlighted selection of the text string.
///
/// The function returns E_NOT_SUFFICIENT_BUFFER, which is equivalent to
/// HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER), when the buffer size of
/// hitTestMetrics is too small to hold all the regions calculated by the
/// function. In such situation, the function sets the output value
/// *actualHitTestMetricsCount to the number of geometries calculated.
/// The application is responsible to allocate a new buffer of greater
/// size and call the function again.
///
/// A good value to use as an initial value for maxHitTestMetricsCount may
/// be calculated from the following equation:
/// maxHitTestMetricsCount = lineCount * maxBidiReorderingDepth
///
/// where lineCount is obtained from the value of the output argument
/// *actualLineCount from the function IDWriteTextLayout::GetLineMetrics,
/// and the maxBidiReorderingDepth value from the DWRITE_TEXT_METRICS
/// structure of the output argument *textMetrics from the function
/// IDWriteFactory::CreateTextLayout.
/// </summary>
/// <param name="textPosition">First text position of the specified range.</param>
/// <param name="textLength">Number of positions of the specified range.</param>
/// <param name="originX">Offset of the X origin (left of the layout box) which is added to each of the hit-test metrics returned.</param>
/// <param name="originY">Offset of the Y origin (top of the layout box) which is added to each of the hit-test metrics returned.</param>
/// <param name="hitTestMetrics">Pointer to a buffer of the output geometry fully enclosing the specified position range.</param>
/// <param name="maxHitTestMetricsCount">Maximum number of distinct metrics it could hold in its buffer memory.</param>
/// <param name="actualHitTestMetricsCount">Actual number of metrics returned or needed.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// There are no gaps in the returned metrics. While there could be visual gaps,
/// depending on bidi ordering, each range is contiguous and reports all the text,
/// including any hidden characters and trimmed text.
/// The height of each returned range will be the same within each line, regardless
/// of how the font sizes vary.
/// </remarks>
UINT32
textPosition
,
UINT32
textLength
,
FLOAT
originX
,
FLOAT
originY
,
UINT32
maxHitTestMetricsCount
,
using
IDWriteTextFormat
::
GetFontCollection
;
using
IDWriteTextFormat
::
GetFontFamilyNameLength
;
using
IDWriteTextFormat
::
GetFontFamilyName
;
using
IDWriteTextFormat
::
GetFontWeight
;
using
IDWriteTextFormat
::
GetFontStyle
;
using
IDWriteTextFormat
::
GetFontStretch
;
using
IDWriteTextFormat
::
GetFontSize
;
using
IDWriteTextFormat
::
GetLocaleNameLength
;
using
IDWriteTextFormat
::
GetLocaleName
; };
/// <summary>
/// Encapsulates a 32-bit device independent bitmap and device context, which can be used for rendering glyphs.
/// </summary>
{
/// <summary>
/// Draws a run of glyphs to the bitmap.
/// </summary>
/// <param name="baselineOriginX">Horizontal position of the baseline origin, in DIPs, relative to the upper-left corner of the DIB.</param>
/// <param name="baselineOriginY">Vertical position of the baseline origin, in DIPs, relative to the upper-left corner of the DIB.</param>
/// <param name="measuringMode">Specifies measuring mode for glyphs in the run.
/// Renderer implementations may choose different rendering modes for different measuring modes, for example
/// DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL for DWRITE_MEASURING_MODE_NATURAL,
/// DWRITE_RENDERING_MODE_CLEARTYPE_GDI_CLASSIC for DWRITE_MEASURING_MODE_GDI_CLASSIC, and
/// DWRITE_RENDERING_MODE_CLEARTYPE_GDI_NATURAL for DWRITE_MEASURING_MODE_GDI_NATURAL.
/// </param>
/// <param name="glyphRun">Structure containing the properties of the glyph run.</param>
/// <param name="renderingParams">Object that controls rendering behavior.</param>
/// <param name="textColor">Specifies the foreground color of the text.</param>
/// <param name="blackBoxRect">Optional rectangle that receives the bounding box (in pixels not DIPs) of all the pixels affected by
/// drawing the glyph run. The black box rectangle may extend beyond the dimensions of the bitmap.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
FLOAT
baselineOriginX
,
FLOAT
baselineOriginY
,
DWRITE_MEASURING_MODE
measuringMode
,
COLORREF
textColor
,
/// <summary>
/// Gets a handle to the memory device context.
/// </summary>
/// <returns>
/// Returns the device context handle.
/// </returns>
/// <remarks>
/// An application can use the device context to draw using GDI functions. An application can obtain the bitmap handle
/// (HBITMAP) by calling GetCurrentObject. An application that wants information about the underlying bitmap, including
/// a pointer to the pixel data, can call GetObject to fill in a DIBSECTION structure. The bitmap is always a 32-bit
/// top-down DIB.
/// </remarks>
/// <summary>
/// Gets the number of bitmap pixels per DIP. A DIP (device-independent pixel) is 1/96 inch so this value is the number
/// if pixels per inch divided by 96.
/// </summary>
/// <returns>
/// Returns the number of bitmap pixels per DIP.
/// </returns>
/// <summary>
/// Sets the number of bitmap pixels per DIP. A DIP (device-independent pixel) is 1/96 inch so this value is the number
/// if pixels per inch divided by 96.
/// </summary>
/// <param name="pixelsPerDip">Specifies the number of pixels per DIP.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
FLOAT
pixelsPerDip
/// <summary>
/// Gets the transform that maps abstract coordinate to DIPs. By default this is the identity
/// transform. Note that this is unrelated to the world transform of the underlying device
/// context.
/// </summary>
/// <param name="transform">Receives the transform.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Sets the transform that maps abstract coordinate to DIPs. This does not affect the world
/// transform of the underlying device context.
/// </summary>
/// <param name="transform">Specifies the new transform. This parameter can be NULL, in which
/// case the identity transform is implied.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Gets the dimensions of the bitmap.
/// </summary>
/// <param name="size">Receives the size of the bitmap in pixels.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Resizes the bitmap.
/// </summary>
/// <param name="width">New bitmap width, in pixels.</param>
/// <param name="height">New bitmap height, in pixels.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
width
,
UINT32
height
};
/// <summary>
/// The GDI interop interface provides interoperability with GDI.
/// </summary>
{
/// <summary>
/// Creates a font object that matches the properties specified by the LOGFONT structure
/// in the system font collection (GetSystemFontCollection).
/// </summary>
/// <param name="logFont">Structure containing a GDI-compatible font description.</param>
/// <param name="font">Receives a newly created font object if successful, or NULL in case of error.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Initializes a LOGFONT structure based on the GDI-compatible properties of the specified font.
/// </summary>
/// <param name="font">Specifies a font.</param>
/// <param name="logFont">Structure that receives a GDI-compatible font description.</param>
/// <param name="isSystemFont">Contains TRUE if the specified font object is part of the system font collection
/// or FALSE otherwise.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Initializes a LOGFONT structure based on the GDI-compatible properties of the specified font.
/// </summary>
/// <param name="font">Specifies a font face.</param>
/// <param name="logFont">Structure that receives a GDI-compatible font description.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Creates a font face object that corresponds to the currently selected HFONT.
/// </summary>
/// <param name="hdc">Handle to a device context into which a font has been selected. It is assumed that the client
/// has already performed font mapping and that the font selected into the DC is the actual font that would be used
/// for rendering glyphs.</param>
/// <param name="fontFace">Contains the newly created font face object, or NULL in case of failure.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
HDC
hdc
,
/// <summary>
/// Creates an object that encapsulates a bitmap and memory DC which can be used for rendering glyphs.
/// </summary>
/// <param name="hdc">Optional device context used to create a compatible memory DC.</param>
/// <param name="width">Width of the bitmap.</param>
/// <param name="height">Height of the bitmap.</param>
/// <param name="renderTarget">Receives a pointer to the newly created render target.</param>
UINT32
width
,
UINT32
height
, };
/// <summary>
/// The DWRITE_TEXTURE_TYPE enumeration identifies a type of alpha texture. An alpha texture is a bitmap of alpha values, each
/// representing the darkness (i.e., opacity) of a pixel or subpixel.
/// </summary>
enum
DWRITE_TEXTURE_TYPE
{
/// <summary>
/// Specifies an alpha texture for aliased text rendering (i.e., bi-level, where each pixel is either fully opaque or fully transparent),
/// with one byte per pixel.
/// </summary>
DWRITE_TEXTURE_ALIASED_1x1
,
/// <summary>
/// Specifies an alpha texture for ClearType text rendering, with three bytes per pixel in the horizontal dimension and
/// one byte per pixel in the vertical dimension.
/// </summary>
DWRITE_TEXTURE_CLEARTYPE_3x1
};
/// <summary>
/// Maximum alpha value in a texture returned by IDWriteGlyphRunAnalysis::CreateAlphaTexture.
/// </summary>
#define DWRITE_ALPHA_MAX 255
/// <summary>
/// Interface that encapsulates information used to render a glyph run.
/// </summary>
{
/// <summary>
/// Gets the bounding rectangle of the physical pixels affected by the glyph run.
/// </summary>
/// <param name="textureType">Specifies the type of texture requested. If a bi-level texture is requested, the
/// bounding rectangle includes only bi-level glyphs. Otherwise, the bounding rectangle includes only anti-aliased
/// glyphs.</param>
/// <param name="textureBounds">Receives the bounding rectangle, or an empty rectangle if there are no glyphs
/// if the specified type.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_TEXTURE_TYPE
textureType
,
/// <summary>
/// Creates an alpha texture of the specified type.
/// </summary>
/// <param name="textureType">Specifies the type of texture requested. If a bi-level texture is requested, the
/// texture contains only bi-level glyphs. Otherwise, the texture contains only anti-aliased glyphs.</param>
/// <param name="textureBounds">Specifies the bounding rectangle of the texture, which can be different than
/// the bounding rectangle returned by GetAlphaTextureBounds.</param>
/// <param name="alphaValues">Receives the array of alpha values.</param>
/// <param name="bufferSize">Size of the alphaValues array. The minimum size depends on the dimensions of the
/// rectangle and the type of texture requested.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_TEXTURE_TYPE
textureType
,
UINT32
bufferSize
/// <summary>
/// Gets properties required for ClearType blending.
/// </summary>
/// <param name="renderingParams">Rendering parameters object. In most cases, the values returned in the output
/// parameters are based on the properties of this object. The exception is if a GDI-compatible rendering mode
/// is specified.</param>
/// <param name="blendGamma">Receives the gamma value to use for gamma correction.</param>
/// <param name="blendEnhancedContrast">Receives the enhanced contrast value.</param>
/// <param name="blendClearTypeLevel">Receives the ClearType level.</param>
};
/// <summary>
/// The root factory interface for all DWrite objects.
/// </summary>
{
/// <summary>
/// Gets a font collection representing the set of installed fonts.
/// </summary>
/// <param name="fontCollection">Receives a pointer to the system font collection object, or NULL in case of failure.</param>
/// <param name="checkForUpdates">If this parameter is nonzero, the function performs an immediate check for changes to the set of
/// installed fonts. If this parameter is FALSE, the function will still detect changes if the font cache service is running, but
/// there may be some latency. For example, an application might specify TRUE if it has itself just installed a font and wants to
/// be sure the font collection contains that font.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Creates a font collection using a custom font collection loader.
/// </summary>
/// <param name="collectionLoader">Application-defined font collection loader, which must have been previously
/// registered using RegisterFontCollectionLoader.</param>
/// <param name="collectionKey">Key used by the loader to identify a collection of font files.</param>
/// <param name="collectionKeySize">Size in bytes of the collection key.</param>
/// <param name="fontCollection">Receives a pointer to the system font collection object, or NULL in case of failure.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
collectionKeySize
,
/// <summary>
/// Registers a custom font collection loader with the factory object.
/// </summary>
/// <param name="fontCollectionLoader">Application-defined font collection loader.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Unregisters a custom font collection loader that was previously registered using RegisterFontCollectionLoader.
/// </summary>
/// <param name="fontCollectionLoader">Application-defined font collection loader.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// CreateFontFileReference creates a font file reference object from a local font file.
/// </summary>
/// <param name="filePath">Absolute file path. Subsequent operations on the constructed object may fail
/// if the user provided filePath doesn't correspond to a valid file on the disk.</param>
/// <param name="lastWriteTime">Last modified time of the input file path. If the parameter is omitted,
/// the function will access the font file to obtain its last write time, so the clients are encouraged to specify this value
/// to avoid extra disk access. Subsequent operations on the constructed object may fail
/// if the user provided lastWriteTime doesn't match the file on the disk.</param>
/// <param name="fontFile">Contains newly created font file reference object, or NULL in case of failure.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// CreateCustomFontFileReference creates a reference to an application specific font file resource.
/// This function enables an application or a document to use a font without having to install it on the system.
/// The fontFileReferenceKey has to be unique only in the scope of the fontFileLoader used in this call.
/// </summary>
/// <param name="fontFileReferenceKey">Font file reference key that uniquely identifies the font file resource
/// during the lifetime of fontFileLoader.</param>
/// <param name="fontFileReferenceKeySize">Size of font file reference key in bytes.</param>
/// <param name="fontFileLoader">Font file loader that will be used by the font system to load data from the file identified by
/// fontFileReferenceKey.</param>
/// <param name="fontFile">Contains the newly created font file object, or NULL in case of failure.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// This function is provided for cases when an application or a document needs to use a font
/// without having to install it on the system. fontFileReferenceKey has to be unique only in the scope
/// of the fontFileLoader used in this call.
/// </remarks>
UINT32
fontFileReferenceKeySize
,
/// <summary>
/// Creates a font face object.
/// </summary>
/// <param name="fontFaceType">The file format of the font face.</param>
/// <param name="numberOfFiles">The number of font files required to represent the font face.</param>
/// <param name="fontFiles">Font files representing the font face. Since IDWriteFontFace maintains its own references
/// to the input font file objects, it's OK to release them after this call.</param>
/// <param name="faceIndex">The zero based index of a font face in cases when the font files contain a collection of font faces.
/// If the font files contain a single face, this value should be zero.</param>
/// <param name="fontFaceSimulationFlags">Font face simulation flags for algorithmic emboldening and italicization.</param>
/// <param name="fontFace">Contains the newly created font face object, or NULL in case of failure.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
DWRITE_FONT_FACE_TYPE
fontFaceType
,
UINT32
numberOfFiles
,
UINT32
faceIndex
,
DWRITE_FONT_SIMULATIONS
fontFaceSimulationFlags
,
/// <summary>
/// Creates a rendering parameters object with default settings for the primary monitor.
/// </summary>
/// <param name="renderingParams">Holds the newly created rendering parameters object, or NULL in case of failure.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Creates a rendering parameters object with default settings for the specified monitor.
/// </summary>
/// <param name="monitor">The monitor to read the default values from.</param>
/// <param name="renderingParams">Holds the newly created rendering parameters object, or NULL in case of failure.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
HMONITOR
monitor
,
/// <summary>
/// Creates a rendering parameters object with the specified properties.
/// </summary>
/// <param name="gamma">The gamma value used for gamma correction, which must be greater than zero and cannot exceed 256.</param>
/// <param name="enhancedContrast">The amount of contrast enhancement, zero or greater.</param>
/// <param name="clearTypeLevel">The degree of ClearType level, from 0.0f (no ClearType) to 1.0f (full ClearType).</param>
/// <param name="pixelGeometry">The geometry of a device pixel.</param>
/// <param name="renderingMode">Method of rendering glyphs. In most cases, this should be DWRITE_RENDERING_MODE_DEFAULT to automatically use an appropriate mode.</param>
/// <param name="renderingParams">Holds the newly created rendering parameters object, or NULL in case of failure.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
FLOAT
gamma
,
FLOAT
enhancedContrast
,
FLOAT
clearTypeLevel
,
DWRITE_PIXEL_GEOMETRY
pixelGeometry
,
DWRITE_RENDERING_MODE
renderingMode
,
/// <summary>
/// Registers a font file loader with DirectWrite.
/// </summary>
/// <param name="fontFileLoader">Pointer to the implementation of the IDWriteFontFileLoader for a particular file resource type.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// This function registers a font file loader with DirectWrite.
/// Font file loader interface handles loading font file resources of a particular type from a key.
/// The font file loader interface is recommended to be implemented by a singleton object.
/// A given instance can only be registered once.
/// Succeeding attempts will return an error that it has already been registered.
/// IMPORTANT: font file loader implementations must not register themselves with DirectWrite
/// inside their constructors and must not unregister themselves in their destructors, because
/// registration and unregistration operations increment and decrement the object reference count respectively.
/// Instead, registration and unregistration of font file loaders with DirectWrite should be performed
/// outside of the font file loader implementation as a separate step.
/// </remarks>
/// <summary>
/// Unregisters a font file loader that was previously registered with the DirectWrite font system using RegisterFontFileLoader.
/// </summary>
/// <param name="fontFileLoader">Pointer to the file loader that was previously registered with the DirectWrite font system using RegisterFontFileLoader.</param>
/// <returns>
/// This function will succeed if the user loader is requested to be removed.
/// It will fail if the pointer to the file loader identifies a standard DirectWrite loader,
/// or a loader that is never registered or has already been unregistered.
/// </returns>
/// <remarks>
/// This function unregisters font file loader callbacks with the DirectWrite font system.
/// The font file loader interface is recommended to be implemented by a singleton object.
/// IMPORTANT: font file loader implementations must not register themselves with DirectWrite
/// inside their constructors and must not unregister themselves in their destructors, because
/// registration and unregistration operations increment and decrement the object reference count respectively.
/// Instead, registration and unregistration of font file loaders with DirectWrite should be performed
/// outside of the font file loader implementation as a separate step.
/// </remarks>
/// <summary>
/// Create a text format object used for text layout.
/// </summary>
/// <param name="fontFamilyName">Name of the font family</param>
/// <param name="fontCollection">Font collection. NULL indicates the system font collection.</param>
/// <param name="fontWeight">Font weight</param>
/// <param name="fontStyle">Font style</param>
/// <param name="fontStretch">Font stretch</param>
/// <param name="fontSize">Logical size of the font in DIP units. A DIP ("device-independent pixel") equals 1/96 inch.</param>
/// <param name="localeName">Locale name</param>
/// <param name="textFormat">Contains newly created text format object, or NULL in case of failure.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// If fontCollection is nullptr, the system font collection is used, grouped by typographic family name
/// (DWRITE_FONT_FAMILY_MODEL_WEIGHT_STRETCH_STYLE) without downloadable fonts.
/// </remarks>
DWRITE_FONT_WEIGHT
fontWeight
,
DWRITE_FONT_STYLE
fontStyle
,
DWRITE_FONT_STRETCH
fontStretch
,
FLOAT
fontSize
,
/// <summary>
/// Create a typography object used in conjunction with text format for text layout.
/// </summary>
/// <param name="typography">Contains newly created typography object, or NULL in case of failure.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Create an object used for interoperability with GDI.
/// </summary>
/// <param name="gdiInterop">Receives the GDI interop object if successful, or NULL in case of failure.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// CreateTextLayout takes a string, format, and associated constraints
/// and produces an object representing the fully analyzed
/// and formatted result.
/// </summary>
/// <param name="string">The string to layout.</param>
/// <param name="stringLength">The length of the string.</param>
/// <param name="textFormat">The format to apply to the string.</param>
/// <param name="maxWidth">Width of the layout box.</param>
/// <param name="maxHeight">Height of the layout box.</param>
/// <param name="textLayout">The resultant object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
stringLength
,
FLOAT
maxWidth
,
FLOAT
maxHeight
,
/// <summary>
/// CreateGdiCompatibleTextLayout takes a string, format, and associated constraints
/// and produces and object representing the result formatted for a particular display resolution
/// and measuring mode. The resulting text layout should only be used for the intended resolution,
/// and for cases where text scalability is desired, CreateTextLayout should be used instead.
/// </summary>
/// <param name="string">The string to layout.</param>
/// <param name="stringLength">The length of the string.</param>
/// <param name="textFormat">The format to apply to the string.</param>
/// <param name="layoutWidth">Width of the layout box.</param>
/// <param name="layoutHeight">Height of the layout box.</param>
/// <param name="pixelsPerDip">Number of physical pixels per DIP. For example, if rendering onto a 96 DPI device then pixelsPerDip
/// is 1. If rendering onto a 120 DPI device then pixelsPerDip is 120/96.</param>
/// <param name="transform">Optional transform applied to the glyphs and their positions. This transform is applied after the
/// scaling specified the font size and pixelsPerDip.</param>
/// <param name="useGdiNatural">
/// When set to FALSE, instructs the text layout to use the same metrics as GDI aliased text.
/// When set to TRUE, instructs the text layout to use the same metrics as text measured by GDI using a font
/// created with CLEARTYPE_NATURAL_QUALITY.
/// </param>
/// <param name="textLayout">The resultant object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
UINT32
stringLength
,
FLOAT
layoutWidth
,
FLOAT
layoutHeight
,
FLOAT
pixelsPerDip
,
BOOL
useGdiNatural
,
/// <summary>
/// The application may call this function to create an inline object for trimming, using an ellipsis as the omission sign.
/// The ellipsis will be created using the current settings of the format, including base font, style, and any effects.
/// Alternate omission signs can be created by the application by implementing IDWriteInlineObject.
/// </summary>
/// <param name="textFormat">Text format used as a template for the omission sign.</param>
/// <param name="trimmingSign">Created omission sign.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Return an interface to perform text analysis with.
/// </summary>
/// <param name="textAnalyzer">The resultant object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <summary>
/// Creates a number substitution object using a locale name,
/// substitution method, and whether to ignore user overrides (uses NLS
/// defaults for the given culture instead).
/// </summary>
/// <param name="substitutionMethod">Method of number substitution to use.</param>
/// <param name="localeName">Which locale to obtain the digits from.</param>
/// <param name="ignoreUserOverride">Ignore the user's settings and use the locale defaults</param>
/// <param name="numberSubstitution">Receives a pointer to the newly created object.</param>
/// <summary>
/// Creates a glyph run analysis object, which encapsulates information
/// used to render a glyph run.
/// </summary>
/// <param name="glyphRun">Structure specifying the properties of the glyph run.</param>
/// <param name="pixelsPerDip">Number of physical pixels per DIP. For example, if rendering onto a 96 DPI bitmap then pixelsPerDip
/// is 1. If rendering onto a 120 DPI bitmap then pixelsPerDip is 120/96.</param>
/// <param name="transform">Optional transform applied to the glyphs and their positions. This transform is applied after the
/// scaling specified by the emSize and pixelsPerDip.</param>
/// <param name="renderingMode">Specifies the rendering mode, which must be one of the raster rendering modes (i.e., not default
/// and not outline).</param>
/// <param name="measuringMode">Specifies the method to measure glyphs.</param>
/// <param name="baselineOriginX">Horizontal position of the baseline origin, in DIPs.</param>
/// <param name="baselineOriginY">Vertical position of the baseline origin, in DIPs.</param>
/// <param name="glyphRunAnalysis">Receives a pointer to the newly created object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
FLOAT
pixelsPerDip
,
DWRITE_RENDERING_MODE
renderingMode
,
DWRITE_MEASURING_MODE
measuringMode
,
FLOAT
baselineOriginX
,
FLOAT
baselineOriginY
, };
// interface IDWriteFactory
/// <summary>
/// Creates a DirectWrite factory object that is used for subsequent creation of individual DirectWrite objects.
/// </summary>
/// <param name="factoryType">Identifies whether the factory object will be shared or isolated.</param>
/// <param name="iid">Identifies the DirectWrite factory interface, such as __uuidof(IDWriteFactory).</param>
/// <param name="factory">Receives the DirectWrite factory object.</param>
/// <returns>
/// Standard HRESULT error code.
/// </returns>
/// <remarks>
/// Obtains DirectWrite factory object that is used for subsequent creation of individual DirectWrite classes.
/// DirectWrite factory contains internal state such as font loader registration and cached font data.
/// In most cases it is recommended to use the shared factory object, because it allows multiple components
/// that use DirectWrite to share internal DirectWrite state and reduce memory usage.
/// However, there are cases when it is desirable to reduce the impact of a component,
/// such as a plug-in from an untrusted source, on the rest of the process by sandboxing and isolating it
/// from the rest of the process components. In such cases, it is recommended to use an isolated factory for the sandboxed
/// component.
/// </remarks>
);
// Macros used to define DirectWrite error codes.
#define FACILITY_DWRITE 0x898
#define DWRITE_ERR_BASE 0x5000
#define MAKE_DWRITE_HR(severity, code) MAKE_HRESULT(severity, FACILITY_DWRITE, (DWRITE_ERR_BASE + code))
#define MAKE_DWRITE_HR_ERR(code) MAKE_DWRITE_HR(SEVERITY_ERROR, code)
// DWrite errors have moved to winerror.h
#endif /* DWRITE_H_INCLUDED */