ref: b466a7650ce97d3843bcbb4b145bda323a201022
dir: /src/cache/ftcimage.h/
#ifndef FTCIMAGE_H
#define FTCIMAGE_H
#include <cache/ftcmanag.h>
#include <freetype/ftglyph.h>
typedef struct FTC_Image_QueueRec_* FTC_Image_Queue;
typedef struct FTC_Image_CacheRec_* FTC_Image_Cache;
typedef struct FTC_ImageNodeRec_* FTC_ImageNode;
/* types of glyph images */
typedef enum FTC_Image_Type_
{
ftc_image_mono = 0, /* monochrome bitmap */
ftc_image_grays, /* anti-aliased bitmap */
ftc_image_outline, /* scaled outline */
ftc_image_master_outline, /* original outline */
} FTC_Image_Type;
/* a descriptor used to describe all glyphs in a given queue */
typedef struct FTC_Image_Desc_
{
FTC_FaceID face_id;
FT_UInt pix_width;
FT_UInt pix_height;
FT_UInt image_type;
} FTC_Image_Desc;
/* macros used to pack a glyph index and a queue index in a single ptr */
#define FTC_PTR_TO_GINDEX(p) ((FT_UInt)((FT_ULong)(p) >> 16))
#define FTC_PTR_TO_QINDEX(p) ((FT_UInt)((FT_ULong)(p) & 0xFFFF))
#define FTC_INDICES_TO_PTR(g,q) ((FT_Pointer)(((FT_ULong)(g) << 16) | \
((FT_ULong)(q) & 0xFFFF)))
typedef struct FTC_ImageNodeRec_
{
FT_ListNodeRec root1; /* root1.data contains a FT_Glyph handle */
FT_ListNodeRec root2; /* root2.data contains a glyph index + queue index */
} FTC_ImageNodeRec;
/* macros to read/set the glyph & queue index in a FTC_ImageNode */
#define FTC_IMAGENODE_GET_GINDEX(n) FTC_PTR_TO_GINDEX((n)->root2.data)
#define FTC_IMAGENODE_GET_QINDEX(n) FTC_PTR_TO_QINDEX((n)->root2.data)
#define FTC_IMAGENODE_SET_INDICES(g,q) \
do { (n)->root2.data = FTC_INDICES_TO_PTR(g,q); } while (0)
typedef struct FTC_Image_CacheRec_
{
FTC_Manager manager;
FT_Memory memory;
FT_ULong max_bytes; /* maximum size of cache in bytes */
FT_ULong num_bytes; /* current size of cache in bytes */
FT_Lru queues_lru; /* static queues lru list */
} FTC_Image_Cache;
/* a table of functions used to generate/manager glyph images */
typedef struct FTC_Image_Class_
{
FT_Error (*init_image)( FTC_Image_Queue queue,
FTC_Image_Node node );
void (*done_image)( FTC_Image_Queue queue,
FTC_Image_Node node );
FT_ULong (*size_image)( FTC_Image_Queue queue,
FTC_Image_Node node );
} FTC_Image_Class;
typedef struct FTC_Image_QueueRec_
{
FTC_Image_Cache cache;
FTC_Manager manager;
FT_Memory memory;
FTC_Image_Class* clazz;
FTC_Image_Desc descriptor;
FT_UInt hash_size;
FT_List buckets;
} FTC_Image_SubCacheRec;
FT_EXPORT_DEF(FT_Error) FTC_Image_Cache_New( FTC_Manager manager,
FT_ULong max_bytes,
FTC_Image_Cache *acache );
FT_EXPORT_DEF(void) FTC_Image_Cache_Done( FTC_Image_Cache cache );
FT_EXPORT_DEF(FT_Error) FTC_Image_Cache_Lookup( FTC_Image_Cache cache,
FTC_Image_Desc* desc,
FT_UInt gindex,
FT_Glyph *aglyph );
#endif /* FTCIMAGE_H */