bitmap.c

DC的SEGA_GG模拟器源代码

/* bitmap.c */

#include <dream.h>
#include <bitmap.h>


void load_bmp (char * pic_name, uint8 *pic_buffer) {

	file_header bmfh;
	info_header bmih;

	int fp;
        fp = iso_open (pic_name, O_RDONLY);
    
        if(fp < 0) {
                serial_printf("Error opening picture file");
                return;
	}

        if (iso_read (fp, &bmfh, 14) != 14) {
                serial_printf("Error reading file header");
		return;
	}
        if (iso_read (fp, &bmih, 40) != 40) {
                serial_printf("Error reading info header");
		return;
	}

        if (iso_read (fp, pic_buffer, bmih.biHeight*bmih.biWidth*3) != (bmih.biHeight*bmih.biWidth*3)) {
                serial_printf("Error reading picture data");
		return;
	}

        iso_close (fp);

}

void blit(uint8 *source, uint16 *dest, int source_x, int source_y, int dest_x, int dest_y, int width, int height) {
        unsigned short *vram = vram_s + (width*(height-1));
        unsigned char *pic_ptr = source;

	uint16 r, g, b;
        int i, j;

        for (i=dest_y; i<height; i++) {

                for (j=dest_x; j<width; j++) {

			b = (uint16)(*pic_ptr++ * 32) / 256;
			g = (uint16)(*pic_ptr++ * 64) / 256;
			r = (uint16)(*pic_ptr++ * 32) / 256;

			*vram++ = (r << 11) | (g << 5) | (b << 0);
		}

                vram -= 640;
	}
}