GDI Font and Text Services

GDI provides support for font management and text output. The FONTOBJ structure and related functions give a driver access to a particular instance of a font. To support text output, the driver has access to the STROBJ structure and related functions. The following table lists FONTOBJ- and STROBJ-related functions.

Function	Description
EngComputeGlyphSet	Computes the glyph set supported on a device.
EngFntCacheAlloc	Allocates memory for a cached font file.
EngFntCacheFault	Reports an error to the font engine if the font driver encountered an error reading from or writing to a font data cache.
EngFntCacheLookUp	Retrieves a pointer to cached font file data.
EngGetCurrentCodePage	Returns the system's default OEM and ANSI code pages.
EngGetType1FontList	Retrieves a list of PostScript Type 1 fonts that are installed both locally and remotely.
EngTextOut	This is the GDI simulation for the DrvTextOut function.
FONTOBJ_cGetAllGlyphHandles	Allows the driver to retrieve every glyph handle of a GDI font. The driver uses this service to download an entire font.
FONTOBJ_cGetGlyphs	Translates glyph handles into pointers to the associated glyph data for the font consumer. These pointers are valid until the next call to FONTOBJ_cGetGlyphs.
FONTOBJ_pfdg	Retrieves the pointer to the FD_GLYPHSET structure associated with the specified font.
FONTOBJ_pifi	Retrieves the pointer to the IFIMETRICS structure that describes the associated font.
FONTOBJ_pjOpenTypeTablePointer	Returns a pointer to a view of an OpenType table.
FONTOBJ_pQueryGlyphAttrs	Returns information about a font's glyphs.
FONTOBJ_pvTrueTypeFontFile	Retrieves a pointer to a view of a TrueType, OpenType, or Type1 font file.
FONTOBJ_pwszFontFilePaths	Retrieves the file path(s) associated with a font.
FONTOBJ_pxoGetXform	Retrieves the Notional-to-Device transform for the associated font. This transform is required for a driver to realize a driver-supplied font.
FONTOBJ_vGetInfo	Returns information that describes the associated font.
STROBJ_bEnum	Enumerates glyph identities and positions in the specified STROBJ.
STROBJ_bEnumPositionsOnly	Enumerates glyph identities and positions for a specified text string, but does not create cached glyph bitmaps.
STROBJ_bGetAdvanceWidths	Returns vectors specifying the probable widths of glyphs making up a specified string.
STROBJ_dwGetCodePage	Returns the code page associated with the specified STROBJ.
STROBJ_fxBreakExtra	Retrieves the amount of extra space to be added to each space character in a string when displaying and/or printing justified text.
STROBJ_vEnumStart	Restarts the enumeration of the GLYPHPOS array for the specified STROBJ. This function should be called by the driver prior to subsequent enumerations.