ref: 60402683ba9b64de99c5c31d029eb3b564404d97
dir: /demos/graph/grobjs.h/
/*************************************************************************** * * grobjs.h * * basic object classes defintions * * Copyright 1999 - The FreeType Development Team - www.freetype.org * * * * ***************************************************************************/ #ifndef GROBJS_H #define GROBJS_H #include "graph.h" #include "grconfig.h" #include "grtypes.h" typedef struct grBiColor_ { grColor foreground; grColor background; int num_levels; int max_levels; grColor* levels; } grBiColor; /********************************************************************** * * Technical note : explaining how the blitter works. * * The blitter is used to "draw" a given source bitmap into * a given target bitmap. * * The function called 'compute_clips' is used to compute clipping * constraints. These lead us to compute two areas : * * - the read area : is the rectangle, within the source bitmap, * which will be effectively "drawn" in the * target bitmap. * * - the write area : is the rectangle, within the target bitmap, * which will effectively "receive" the pixels * from the read area * * Note that both areas have the same dimensions, but are * located in distinct surfaces. * * These areas are computed by 'compute_clips' which is called * by each blitting function. * * Note that we use the Y-downwards convention within the blitter * **********************************************************************/ typedef struct grBlitter_ { int width; /* width in pixels of the areas */ int height; /* height in pixels of the areas */ int xread; /* x position of start point in read area */ int yread; /* y position of start point in read area */ int xwrite; /* x position of start point in write area */ int ywrite; /* y position of start point in write area */ int right_clip; /* amount of right clip */ unsigned char* read; /* top left corner of read area in source map */ unsigned char* write; /* top left corner of write area in target map */ int read_line; /* byte increment to go down one row in read area */ int write_line; /* byte increment to go down one row in write area */ grBitmap source; /* source bitmap descriptor */ grBitmap target; /* target bitmap descriptor */ } grBlitter; typedef void (*grBlitterFunc)( grBlitter* blitter, grColor color ); typedef void (*grSetTitleFunc)( grSurface* surface, const char* title_string ); typedef void (*grRefreshRectFunc)( grSurface* surface, int x, int y, int width, int height ); typedef void (*grDoneSurfaceFunc)( grSurface* surface ); typedef int (*grListenEventFunc)( grSurface* surface, int event_mode, grEvent *event ); struct grSurface_ { grDevice* device; grBitmap bitmap; grBool refresh; grBool owner; const byte* saturation; /* used for gray surfaces only */ grBlitterFunc blit_mono; /* 0 by default, set by grBlit.. */ grRefreshRectFunc refresh_rect; grSetTitleFunc set_title; grListenEventFunc listen_event; grDoneSurfaceFunc done; }; /******************************************************************** * * <Function> * grAlloc * * <Description> * Simple memory allocation. The returned block is always zero-ed * * <Input> * size :: size in bytes of the requested block * * <Return> * the memory block address. 0 in case of error * ********************************************************************/ extern char* grAlloc( long size ); /******************************************************************** * * <Function> * grRealloc * * <Description> * Simple memory re-allocation. * * <Input> * block :: original memory block address * size :: new requested block size in bytes * * <Return> * the memory block address. 0 in case of error * ********************************************************************/ extern char* grRealloc( const char* block, long size ); /******************************************************************** * * <Function> * grFree * * <Description> * Simple memory release * * <Input> * block :: target block * ********************************************************************/ extern void grFree( const void* block ); extern grDevice* gr_devices[]; extern int gr_num_devices; extern int gr_max_devices; #endif /* GROBJS_H */