forked from minhngoc25a/freetype2
312 lines
18 KiB
C
312 lines
18 KiB
C
/***************************************************************************/
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/* */
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/* ftcimage.h */
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/* */
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/* FreeType Image cache (specification). */
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/* */
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/* Copyright 2000-2001 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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/*************************************************************************/
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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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#ifndef __FTCIMAGE_H__
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#define __FTCIMAGE_H__
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#include <ft2build.h>
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#include FT_CACHE_H
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FT_BEGIN_HEADER
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/*************************************************************************/
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/* */
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/* <Section> */
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/* cache_subsystem */
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/* */
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/*************************************************************************/
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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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#define ftc_image_format_bitmap 0x0000
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#define ftc_image_format_outline 0x0001
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#define ftc_image_format_mask 0x000F
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#define ftc_image_flag_monochrome 0x0010
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#define ftc_image_flag_unhinted 0x0020
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#define ftc_image_flag_autohinted 0x0040
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#define ftc_image_flag_unscaled 0x0080
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#define ftc_image_flag_no_sbits 0x0100
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/* monochrome bitmap */
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#define ftc_image_mono ftc_image_format_bitmap | \
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ftc_image_flag_monochrome
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/* anti-aliased bitmap */
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#define ftc_image_grays ftc_image_format_bitmap
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/* scaled outline */
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#define ftc_image_outline ftc_image_format_outline
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FTC_ImageDesc */
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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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/* Note that this is different from @FTC_Image_Desc. */
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/* */
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/* <Fields> */
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/* size :: An @FTC_SizeRec used to describe the glyph's face and */
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/* size. */
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/* */
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/* type :: The glyph image's type. Note that it is a 32-bit uint. */
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/* */
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/* <Note> */
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/* This type deprecates @FTC_Image_Desc. */
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/* */
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typedef struct FTC_ImageDesc_
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{
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FTC_FontRec font;
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FT_UInt32 type;
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} FTC_ImageDesc;
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/* */
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#define FTC_IMAGE_DESC_COMPARE( d1, d2 ) \
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( FTC_FONT_COMPARE( &(d1)->font, &(d2)->font ) && \
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(d1)->type == (d2)->type )
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#define FTC_IMAGE_DESC_HASH( d ) \
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(FT_UFast)( FTC_FONT_HASH( &(d)->font ) ^ \
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( (d)->type << 4 ) )
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/*************************************************************************/
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/* */
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/* <Type> */
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/* FTC_ImageCache */
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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_ImageCacheRec_* FTC_ImageCache;
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FTC_ImageCache_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( FT_Error )
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FTC_ImageCache_New( FTC_Manager manager,
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FTC_ImageCache *acache );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FTC_ImageCache_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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/* anode :: Used to return the address of of the corresponding cache */
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/* node after incrementing its reference count (see note */
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/* below). */
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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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/* <Note> */
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/* The returned glyph is owned and managed 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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/* If "anode" is _not_ NULL, it receives the address of the cache */
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/* node containing the glyph image, after increasing its reference */
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/* count. This ensures that the node (as well as the FT_Glyph) will */
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/* always be kept in the cache until you call @FTC_Node_Unref to */
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/* "release" it. */
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/* */
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/* If "anode" is NULL, the cache node is left unchanged, which means */
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/* that the FT_Glyph could be flushed out of the cache on the next */
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/* call to one of the caching sub-system APIs. Don't assume that it */
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/* is persistent! */
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/* */
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FT_EXPORT( FT_Error )
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FTC_ImageCache_Lookup( FTC_ImageCache cache,
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FTC_ImageDesc* desc,
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FT_UInt gindex,
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FT_Glyph *aglyph,
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FTC_Node *anode );
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/* */
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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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/* THIS TYPE IS DEPRECATED. Use @FTC_ImageDesc instead. */
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/* */
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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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/* and 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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/* THIS TYPE IS DEPRECATED. Use @FTC_ImageCache instead. */
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/* */
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typedef FTC_ImageCache 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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/* THIS FUNCTION IS DEPRECATED. Use @FTC_ImageCache_New instead. */
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/* */
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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( FT_Error )
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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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/* THIS FUNCTION IS DEPRECATED. Use @FTC_ImageCache_Lookup instead. */
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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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/* FreeType error code. 0 means success. */
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/* */
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/* <Note> */
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/* The returned glyph is owned and managed 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 is a cache after */
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/* all... */
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/* */
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/* Use this function to "lock" the glyph as long as it is needed. */
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/* */
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FT_EXPORT( 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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/* */
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FT_END_HEADER
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#endif /* __FTCIMAGE_H__ */
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/* END */
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