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/***************************************************************************/
/* */
/* ftcimage.h */
/* */
/* FreeType Image cache (body). */
/* */
/* Copyright 2000-2001 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
/*************************************************************************/
/* */
/* Each image cache really manages FT_Glyph objects. */
/* */
/*************************************************************************/
#ifndef __FTCIMAGE_H__
#define __FTCIMAGE_H__
#include <ft2build.h>
#include FT_CACHE_H
FT_BEGIN_HEADER
/*************************************************************************/
/* */
/* <Section> */
/* cache_subsystem */
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** IMAGE CACHE OBJECT *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
#define FTC_IMAGE_FORMAT( x ) ( (x) & 7 )
#define ftc_image_format_bitmap 0
#define ftc_image_format_outline 1
#define ftc_image_flag_monochrome 16
#define ftc_image_flag_unhinted 32
#define ftc_image_flag_autohinted 64
#define ftc_image_flag_unscaled 128
#define ftc_image_flag_no_sbits 256
/* monochrome bitmap */
#define ftc_image_mono ftc_image_format_bitmap | \
ftc_image_flag_monochrome
/* anti-aliased bitmap */
#define ftc_image_grays ftc_image_format_bitmap
/* scaled outline */
#define ftc_image_outline ftc_image_format_outline
/*************************************************************************/
/* */
/* <Struct> */
/* FTC_Image_Desc */
/* */
/* <Description> */
/* A simple structure used to describe a given glyph image category. */
/* */
/* <Fields> */
/* size :: An FTC_SizeRec used to describe the glyph's face & */
/* size. */
/* */
/* image_type :: The glyph image's type. */
/* */
typedef struct FTC_Image_Desc_
{
FTC_FontRec font;
FT_UInt image_type;
} FTC_Image_Desc;
/* */
#define FTC_IMAGE_DESC_COMPARE( d1, d2 ) \
( FTC_FONT_COMPARE( &(d1)->font, &(d2)->font ) && \
(d1)->image_type == (d2)->image_type )
#define FTC_IMAGE_DESC_HASH( d ) \
(FT_UFast)( FTC_FONT_HASH(&(d)->font) ^ \
((d)->image_type << 4) )
/*************************************************************************/
/* */
/* <Type> */
/* FTC_Image_Cache */
/* */
/* <Description> */
/* A handle to an glyph image cache object. They are designed to */
/* hold many distinct glyph images, while not exceeding a certain */
/* memory threshold. */
/* */
typedef struct FTC_Image_CacheRec_* FTC_Image_Cache;
/*************************************************************************/
/* */
/* <Function> */
/* FTC_Image_Cache_New */
/* */
/* <Description> */
/* Creates a new glyph image cache. */
/* */
/* <Input> */
/* manager :: The parent manager for the image cache. */
/* */
/* <Output> */
/* acache :: A handle to the new glyph image cache object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT( FT_Error )
FTC_Image_Cache_New( FTC_Manager manager,
FTC_Image_Cache *acache );
/*************************************************************************/
/* */
/* <Function> */
/* FTC_Image_Cache_Lookup */
/* */
/* <Description> */
/* Retrieves a given glyph image from a glyph image cache. */
/* */
/* <Input> */
/* cache :: A handle to the source glyph image cache. */
/* */
/* desc :: A pointer to a glyph image descriptor. */
/* */
/* gindex :: The glyph index to retrieve. */
/* */
/* <Output> */
/* aglyph :: The corresponding FT_Glyph object. 0 in case of */
/* failure. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The returned glyph is owned and managed by the glyph image cache. */
/* Never try to transform or discard it manually! You can however */
/* create a copy with FT_Glyph_Copy() and modify the new one. */
/* */
/* Because the glyph image cache limits the total amount of memory */
/* taken by the glyphs it holds, the returned glyph might disappear */
/* on a later invocation of this function! It's a cache after all... */
/* */
FT_EXPORT( FT_Error )
FTC_Image_Cache_Lookup( FTC_Image_Cache cache,
FTC_Image_Desc* desc,
FT_UInt gindex,
FT_Glyph *aglyph );
/* */
FT_END_HEADER
#endif /* __FTCIMAGE_H__ */
/* END */
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