gfx_damage.h

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#pragma once
 
#include <stdbool.h>
#include <stdint.h>
 
#include "gfx.h"
 
#ifdef __cplusplus
extern "C" {
#endif

#define GFX_DAMAGE_BAND_SHIFT 4
#define GFX_DAMAGE_BAND_H     (1 << GFX_DAMAGE_BAND_SHIFT)
#define GFX_DAMAGE_MAX_BANDS  64
#define GFX_DAMAGE_MAX_RECTS  8

typedef struct {
    uintptr_t base;    
    uintptr_t end;     
    int32_t stride;    
    int16_t width;     
    int16_t height;    
    int16_t bands;     
    bool all;          
    int16_t lo[GFX_DAMAGE_MAX_BANDS]; 
    int16_t hi[GFX_DAMAGE_MAX_BANDS]; 
    uintptr_t last;    
    int16_t last_x;    
    int16_t last_y;    
} gfx_damage_t;

extern gfx_damage_t *gfx_damage_sink;

void gfx_damage_init(gfx_damage_t *d, const gfx_canvas_t *root);

void gfx_damage_reset(gfx_damage_t *d);

void gfx_damage_all(gfx_damage_t *d);

void gfx_damage_mark(gfx_damage_t *d, const gfx_canvas_t *c, int x, int y,
                     int w, int h);

bool gfx_damage_empty(const gfx_damage_t *d);

int gfx_damage_rects(const gfx_damage_t *d, gfx_rect_t *out, int max);

gfx_rect_t gfx_damage_turn(gfx_rect_t r, int width, int height);

void gfx_damage_attach(gfx_damage_t *d);
 
#ifdef __cplusplus
}
#endif