178 lines
7.1 KiB
C
178 lines
7.1 KiB
C
/***************************************************************************/
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/* */
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/* ftdriver.h */
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/* */
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/* FreeType font driver interface (specification). */
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/* */
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/* Copyright 1996-2000 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used */
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/* modified and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#ifndef FTDRIVER_H
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#define FTDRIVER_H
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#include <freetype/ftmodule.h>
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#include <freetype/config/ftconfig.h>
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typedef FT_Error (*FTDriver_initFace)( FT_Stream stream,
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FT_Face face,
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FT_Int typeface_index,
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FT_Int num_params,
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FT_Parameter* parameters );
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typedef void (*FTDriver_doneFace)( FT_Face face );
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typedef FT_Error (*FTDriver_initSize)( FT_Size size );
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typedef void (*FTDriver_doneSize)( FT_Size size );
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typedef FT_Error (*FTDriver_initGlyphSlot)( FT_GlyphSlot slot );
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typedef void (*FTDriver_doneGlyphSlot)( FT_GlyphSlot slot );
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typedef FT_Error (*FTDriver_setCharSizes)( FT_Size size,
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FT_F26Dot6 char_width,
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FT_F26Dot6 char_height,
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FT_UInt horz_resolution,
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FT_UInt vert_resolution );
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typedef FT_Error (*FTDriver_setPixelSizes)( FT_Size size,
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FT_UInt pixel_width,
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FT_UInt pixel_height );
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typedef FT_Error (*FTDriver_loadGlyph)( FT_GlyphSlot slot,
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FT_Size size,
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FT_UInt glyph_index,
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FT_Int load_flags );
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typedef FT_UInt (*FTDriver_getCharIndex)( FT_CharMap charmap,
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FT_Long charcode );
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typedef FT_Error (*FTDriver_getKerning)( FT_Face face,
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FT_UInt left_glyph,
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FT_UInt right_glyph,
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FT_Vector* kerning );
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typedef FT_Error (*FTDriver_attachFile)( FT_Face face, FT_Stream stream );
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typedef FT_Error (*FTDriver_getAdvances)( FT_Face face,
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FT_UInt first,
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FT_UInt count,
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FT_Bool vertical,
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FT_UShort* advances );
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/*************************************************************************
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*
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* <Struct>
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* FT_Driver_Class
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*
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* <Description>
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* The font driver class. This structure mostly contains pointers to
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* driver methods.
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*
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* <Fields>
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* face_object_size :: size of a face object in bytes
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* size_object_size :: size of a size object in bytes
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* slot_object_size :: size of a glyph object in bytes
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*
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* init_face :: format-specific face constructor
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* done_face :: format-specific face destructor
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*
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* init_size :: format-specific size constructor
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* done_size :: format-specific size destructor
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*
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* init_slot :: format-specific slot constructor
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* done_slot :: format-specific slot destructor
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*
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* set_char_sizes :: handle to a function used to set the new character
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* size in points + resolution. can be set to 0 to
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* indicate default behaviour
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*
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* set_pixel_sizes :: handme to function used to set the new character
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* size in pixels. can be set to 0 to indicate
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* default behaviour
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*
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* load_glyph :: load a given glyph image in a slot. This field
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* is mandatory !
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*
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* get_char_index :: return the glyph index of a given character
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* for a given charmap. This field is mandatory !
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*
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* get_kerning :: return the unscaled kerning for a given pair
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* of glyphs. can be set to 0 if the format doesn't
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* support kerning.
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*
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* attach_file :: reads additional data for a face from another
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* file/stream. For example, this can be used
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* to add data from AFM or PFM files on a Type 1
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* face, or a CIDMap on a CID-keyed face..
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*
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* get_advances :: a function used to return the advances of 'count'
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* glyphs, starting at 'index'. the "vertical" flags
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* must be set when vertical advances are queried.
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* the advances buffer is caller-allocated
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*
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* get_bboxes :: a function used to return the bounding box of
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* 'count' glyphs, starting at 'index'. the bbox
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* buffer is caller-allocated
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*
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* <Note>
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* Most function pointers, with the exception of "load_glyph" and
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* "get_char_index" can be set to 0 to indicate a the default behaviour
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*
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*
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*************************************************************************/
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typedef struct FT_Driver_Class_
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{
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FT_Module_Class root;
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FT_Int face_object_size;
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FT_Int size_object_size;
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FT_Int slot_object_size;
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FTDriver_initFace init_face;
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FTDriver_doneFace done_face;
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FTDriver_initSize init_size;
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FTDriver_doneSize done_size;
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FTDriver_initGlyphSlot init_slot;
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FTDriver_doneGlyphSlot done_slot;
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FTDriver_setCharSizes set_char_sizes;
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FTDriver_setPixelSizes set_pixel_sizes;
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FTDriver_loadGlyph load_glyph;
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FTDriver_getCharIndex get_char_index;
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FTDriver_getKerning get_kerning;
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FTDriver_attachFile attach_file;
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FTDriver_getAdvances get_advances;
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} FT_Driver_Class;
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#endif /* FTDRIVER_H */
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/* END */
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