191 lines
11 KiB
C
191 lines
11 KiB
C
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/***************************************************************************/
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/* */
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/* ftcimage.c */
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/* */
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/* FreeType Image cache (body). */
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/* */
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/* Each image cache really manages FT_Glyph objects :-) */
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/* */
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/* */
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/* Copyright 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 FTCIMAGE_H
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#define FTCIMAGE_H
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#include <freetype/cache/ftcglyph.h>
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#include <freetype/ftglyph.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** IMAGE CACHE OBJECT *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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#define FTC_IMAGE_FORMAT( x ) ( (x) & 7 )
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/*************************************************************************/
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/* */
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/* <Enum> */
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/* FTC_Image_Type */
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/* */
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/* <Description> */
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/* An enumeration used to list the types of glyph images found in a */
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/* glyph image cache. */
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/* */
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/* <Fields> */
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/* ftc_image_mono :: Monochrome bitmap glyphs. */
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/* */
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/* ftc_image_grays :: Anti-aliased bitmap glyphs. */
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/* */
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/* ftc_image_outline :: Scaled (and hinted) outline glyphs. */
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/* */
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/* ftc_master_outline :: Unscaled original outline glyphs. */
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/* */
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/* <Note> */
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/* Other types may be defined in the future. */
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/* */
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typedef enum FTC_Image_Type_
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{
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ftc_image_format_bitmap = 0,
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ftc_image_format_outline = 1,
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ftc_image_flag_monochrome = 16,
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ftc_image_flag_unhinted = 32,
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ftc_image_flag_autohinted = 64,
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ftc_image_flag_unscaled = 128,
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ftc_image_flag_no_sbits = 256,
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ftc_image_mono = ftc_image_format_bitmap |
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ftc_image_flag_monochrome, /* monochrome bitmap */
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ftc_image_grays = ftc_image_format_bitmap, /* anti-aliased bitmap */
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ftc_image_outline = ftc_image_format_outline /* scaled outline */
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} FTC_Image_Type;
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FTC_Image_Desc */
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/* */
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/* <Description> */
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/* A simple structure used to describe a given glyph image category. */
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/* */
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/* <Fields> */
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/* size :: An FTC_SizeRec used to describe the glyph's face & */
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/* size. */
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/* */
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/* image_type :: The glyph image's type. */
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/* */
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typedef struct FTC_Image_Desc_
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{
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FTC_FontRec font;
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FT_UInt image_type;
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} FTC_Image_Desc;
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/*************************************************************************/
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/* */
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/* <Type> */
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/* FTC_Image_Cache */
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/* */
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/* <Description> */
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/* A handle to an glyph image cache object. They are designed to */
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/* hold many distinct glyph images, while not exceeding a certain */
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/* memory threshold. */
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/* */
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typedef struct FTC_Image_CacheRec_* FTC_Image_Cache;
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FTC_Image_Cache_New */
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/* */
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/* <Description> */
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/* Creates a new glyph image cache. */
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/* */
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/* <Input> */
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/* manager :: The parent manager for the image cache. */
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/* */
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/* <Output> */
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/* acache :: A handle to the new glyph image cache object. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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FT_EXPORT_DEF( FT_Error ) FTC_Image_Cache_New( FTC_Manager manager,
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FTC_Image_Cache* acache );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FTC_Image_Cache_Lookup */
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/* */
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/* <Description> */
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/* Retrieves a given glyph image from a glyph image cache. */
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/* */
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/* <Input> */
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/* cache :: A handle to the source glyph image cache. */
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/* */
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/* desc :: A pointer to a glyph image descriptor. */
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/* */
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/* gindex :: The glyph index to retrieve. */
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/* */
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/* <Output> */
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/* aglyph :: The corresponding FT_Glyph object. 0 in case of */
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/* failure. */
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/* */
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/* <Return> */
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/* error code, 0 means success */
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/* */
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/* <Note> */
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/* the returned glyph is owned and manager by the glyph image cache. */
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/* Never try to transform or discard it manually! You can however */
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/* create a copy with FT_Glyph_Copy() and modify the new one. */
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/* */
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/* Because the glyph image cache limits the total amount of memory */
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/* taken by the glyphs it holds, the returned glyph might disappear */
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/* on a later invocation of this function! It's a cache after all... */
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/* */
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FT_EXPORT_DEF( FT_Error )
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FTC_Image_Cache_Lookup( FTC_Image_Cache cache,
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FTC_Image_Desc* desc,
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FT_UInt gindex,
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FT_Glyph* aglyph );
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#ifdef __cplusplus
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}
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#endif
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#endif /* FTCIMAGE_H */
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/* END */
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