graphics.h

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#ifndef __LIBDRAGON_GRAPHICS_H
#define __LIBDRAGON_GRAPHICS_H
 
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef struct surface_s surface_t;
typedef struct sprite_s sprite_t;
 
typedef struct __attribute__((packed))
{
    uint8_t r;
    uint8_t g;
    uint8_t b;
    uint8_t a;
} color_t;
 
#ifndef __cplusplus
_Static_assert(sizeof(color_t) == 4, "invalid sizeof for color_t");
#endif
 
#define RGBA16(rx,gx,bx,ax) ({ \
    int rx1 = rx, gx1 = gx, bx1 = bx; \
    (color_t){.r=(rx1<<3)|(rx1>>3), .g=(gx1<<3)|(gx1>>3), .b=(bx1<<3)|(bx1>>3), .a=ax ? 0xFF : 0}; \
})
 
#define RGBA32(rx,gx,bx,ax) ({ \
    (color_t){.r=rx, .g=gx, .b=bx, .a=ax}; \
})
 
inline uint16_t color_to_packed16(color_t c) {
    return (((int)c.r >> 3) << 11) | (((int)c.g >> 3) << 6) | (((int)c.b >> 3) << 1) | (c.a >> 7);
}
 
inline uint32_t color_to_packed32(color_t c) {
    return *(uint32_t*)&c;
}
inline color_t color_from_packed16(uint16_t c) {
    int r = (c >> 11) & 0x1F;
    int g = (c >> 6) & 0x1F;
    int b = (c >> 1) & 0x1F;
    return (color_t){ .r=(uint8_t)((r << 3) | (r >> 2)), .g=(uint8_t)((g << 3) | (g >> 2)), .b=(uint8_t)((b << 3) | (b >> 2)), .a=(uint8_t)((c&0x1) ? 0xFF : 0) };
}
 
inline color_t color_from_packed32(uint32_t c) {
    return (color_t){ .r=(uint8_t)(c>>24), .g=(uint8_t)(c>>16), .b=(uint8_t)(c>>8), .a=(uint8_t)c };
}
 
uint32_t graphics_make_color( int r, int g, int b, int a );
 
uint32_t graphics_convert_color( color_t color );
 
void graphics_draw_pixel( surface_t* surf, int x, int y, uint32_t color );
 
void graphics_draw_pixel_trans( surface_t* surf, int x, int y, uint32_t color );
 
void graphics_draw_line( surface_t* surf, int x0, int y0, int x1, int y1, uint32_t color );
 
void graphics_draw_line_trans( surface_t* surf, int x0, int y0, int x1, int y1, uint32_t color );
 
void graphics_draw_box( surface_t* surf, int x, int y, int width, int height, uint32_t color );
 
void graphics_draw_box_trans( surface_t* surf, int x, int y, int width, int height, uint32_t color );
 
void graphics_fill_screen( surface_t* surf, uint32_t c );
 
void graphics_set_color( uint32_t forecolor, uint32_t backcolor );
 
void graphics_set_default_font( void );
 
void graphics_set_font_sprite( sprite_t *font );
 
void graphics_draw_character( surface_t* surf, int x, int y, char ch );
 
void graphics_draw_text( surface_t* surf, int x, int y, const char * const msg );
 
void graphics_draw_sprite( surface_t* surf, int x, int y, sprite_t *sprite );
 
void graphics_draw_sprite_stride( surface_t* surf, int x, int y, sprite_t *sprite, int offset );
 
void graphics_draw_sprite_trans( surface_t* surf, int x, int y, sprite_t *sprite );
 
void graphics_draw_sprite_trans_stride( surface_t* surf, int x, int y, sprite_t *sprite, int offset );
 
#ifdef __cplusplus
}
#endif
 
 
#endif