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Win32 Text API Comparison

For those developers that are migrating their Win32 application code, the following table lists the Win32 Text APIs and the approximate equivalent in DirectWrite.

GDI Text callsDescriptionDirectWrite Equivalent
AddFontMemResourceEx Adds an embedded font to the system font table. CreateCustomFontFileReference + CreateCustomFontCollection
AddFontResource Adds a font resource to the system font table.There is no equivalent. AddFontResource adds to the system font collection as part of the GDI font installation step. DirectWrite populates the system font collection upfront and automatically monitors updates to it, so no installation is ever needed.
AddFontResourceEx Adds a private or non-enumerable font to the system font table.Same as above
CreateFont Creates a logical font.Instead of logical font, applications can specify a set of font properties (for example family name, weight, style, stretch, and size) to create a IDWriteTextFormat. Only apps requiring enumeration of the font will access a IDWriteFont through the IDWriteFontCollection.
CreateFontIndirect Creates a logical font from a structure.Same as above
CreateFontIndirectEx Creates a logical font from a structure.Same as above
DrawText Draws formatted text in a rectangle. IDWriteTextLayout::Draw
DrawTextEx Draws formatted text in a rectangle. IDWriteTextLayout::Draw
EnumFontFamExProc An application-defined callback function used with EnumFontFamiliesEx to process fonts. IDWriteFontCollection interface, through IDWriteFactory::GetSystemFontCollection
EnumFontFamiliesEx Enumerates all fonts in the system with certain characteristics. IDWriteFontCollection interface, through IDWriteFactory::GetSystemFontCollection
ExtTextOut Draws a character string. IDWriteTextLayout::Draw or IDWriteRenderBitmapTarget::DrawGlyphRun
GetAspectRatioFilterEx Gets the setting for the aspect-ratio filter.N/A
GetCharABCWidths Gets the widths of consecutive characters from the TrueType font. IDWriteFontFace::GetDesignGlyphMetrics
GetCharABCWidthsFloat Gets the widths of consecutive characters from the current font. IDWriteFontFace::GetDesignGlyphMetrics
GetCharABCWidthsI Gets the widths of consecutive glyph indices or an array of glyph indices from the TrueType font. IDWriteFontFace::GetDesignGlyphMetrics
GetCharacterPlacement Gets information about a character string. IDWriteTextAnalyzer
GetCharWidth32 Gets the widths of consecutive characters from the current font. IDWriteFontFace::GetDesignGlyphMetrics or IDWriteTextLayout::GetMetrics
GetCharWidthFloat Gets the fractional widths of consecutive characters from the current font. IDWriteFontFace::GetDesignGlyphMetrics or IDWriteTextLayout::GetMetrics
GetCharWidthI Gets the widths of consecutive glyph indices or an array of glyph indices from the current font. IDWriteFontFace::GetDesignGlyphMetrics or IDWriteTextLayout::GetMetrics
GetFontData Gets metric data for a TrueType font. IDWriteFontFace::TryGetFontTable
GetFontLanguageInfo Returns information about the selected font for a display context.N/A
GetFontUnicodeRanges Tells which Unicode characters are supported by a font.loop of IDWriteFont::HasCharacter
GetGlyphIndices Translates a string into an array of glyph indices. IDWriteFontFace::GetGlyphIndices
GetGlyphOutline Gets the outline or bitmap for a character in the TrueType font.glyph metrics -- IDWriteFontFace::GetDesignGlyphMetrics, actual outline information --IDwriteFontFace::GetGlyphRunOutline, if you want glyph bitmaps, IDWriteRenderBitmapRenderTarget::DrawGlyphRun
GetKerningPairs Gets the character-kerning pairs for a font.Kerning allowed via typographic properties of the layout (DirectWrite does kerning itself, so there is no method to return this information).
GetOutlineTextMetrics Gets text metrics for TrueType fonts. IDWriteFontFace::GetMetrics
GetRasterizerCaps Tells whether TrueType fonts are installed.(TrueType fonts are installed on Windows Vista and Windows 7 by default.)
GetTabbedTextExtent Computes the width and height of a character string, including tabs. IDWriteTextLayout::GetMetrics
GetTextAlign Gets the text-alignment setting for a device context. IDWriteTextFormat::GetTextAlignment
GetTextCharacterExtra Gets the current inter character spacing for a device context.N/A
GetTextColor Gets the text color for a device context.N/A. (DirectWrite is independent of rendering and hence does not know the color. Applications need to keep track of it themselves.)
GetTextExtentExPoint Gets the number of characters in a string that will fit within a space. IDWriteTextLayout::GetMetrics
GetTextExtentExPointI Gets the number of glyph indices that will fit within a space. IDWriteTextLayout::GetMetrics
GetTextExtentPoint32 Computes the width and height of a string of text. IDWriteTextLayout::GetMetrics
GetTextExtentPointI Computes the width and height of an array of glyph indices. IDWriteTextLayout::GetMetrics
GetTextFace Gets the name of the font that is selected into a device context. IDWriteFont::GetFaceNames (Returns all of the names)
GetTextMetrics Fills a buffer with the metrics for a font. IDWriteFontFace::GetMetrics
PolyTextOut Draws several strings using the font and text colors in a device context.N/A; create several layout objects
RemoveFontMemResourceEx Removes a font whose source was embedded in a document from the system font table. IUnknown::Release on the associated object
RemoveFontResource Removes the fonts in a file from the system font tableN/A
RemoveFontResourceEx Removes a private or non-enumerable font from the system font table.N/A
SetMapperFlags Alters the algorithm used to map logical fonts to physical fonts.N/A
SetTextAlign Sets the text-alignment flags for a device context. IDWriteTextFormat::SetTextAlignment
SetTextCharacterExtra Sets the inter-character spacing.N/A
SetTextColor Sets the text color for a device context.An application has to take care of specifying the color in one of the Draw calls.
SetTextJustification Specifies the amount of space the system should add to the break characters in a string.N/A. Justification and character spacing are not supported in this release.
TabbedTextOut Writes a character string at a location, expanding tabs to specified values. IDWriteTextLayout::Draw
TextOut Writes a character string at a location IDWriteTextLayout::Draw

 

 

 

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