ref: 41dbcbf6285901c9e1fcc7605cf996341af2ac3e
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 */