savebmp.c

void savebmp(char *name,HI_U8 *buffer,int w,int h) {
    FILE *f=fopen(name,"wb");
    if(!f) {
        printf("Error writing image to disk.\n");
        return;
    }
    unsigned int size=w*h*3+54;
    HI_U8 header[54]={'B','M',size&255,(size>>8)&255,(size>>16)&255,size>>24,0,
                      0,0,0,54,0,0,0,40,0,0,0,w&255,w>>8,0,0,h&255,h>>8,0,0,1,0,24,0,0,0,0,0,0,
                      0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
    fwrite(header,1,54,f);
    fwrite(buffer,1,w*h*3,f);
    fclose(f);
}