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#define MAX(x,y) ((x)>(y)?(x):(y))
#define MIN(x,y) ((x)<(y)?(x):(y))
#define KEY_EOF -1 /* ^D */
#define KEY_ESC -2
#define KEY_SPACE -3
#define KEY_Q -4
#define KEY_PGUP -5
#define KEY_PGDN -6
#define KEY_TIMEOUT -7
vga_modeinfo *svga_guess_mode(int width, int height, int colors, int mode);
void svga_list_modes(void);
void svga_display_image(vga_modeinfo * vgamode, char *image,
int width, int height, int xoff, int yoff);
void svga_gray_palette();
void svga_dither_palette(int r, int g, int b);
void svga_cls(vga_modeinfo * vgamode);
int svga_show(vga_modeinfo * vgamode, char *image,
int width, int height, int timeout);
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