+void TrueRenderControl::reduceDepth(Surface &sf, XImage *im) const
+{
+ // since pixel32 is the largest possible pixel size, we can share the array
+ int r, g, b;
+ int x,y;
+ pixel32 *data = sf.pixelData();
+ pixel16 *p = (pixel16*) data;
+ switch (im->bits_per_pixel) {
+ case 32:
+ if ((_red_offset != default_red_shift) ||
+ (_blue_offset != default_blue_shift) ||
+ (_green_offset != default_green_shift)) {
+ printf("cross endian conversion\n");
+ for (y = 0; y < im->height; y++) {
+ for (x = 0; x < im->width; x++) {
+ r = (data[x] >> default_red_shift) & 0xFF;
+ g = (data[x] >> default_green_shift) & 0xFF;
+ b = (data[x] >> default_blue_shift) & 0xFF;
+ data[x] = (r << _red_offset) + (g << _green_offset) +
+ (b << _blue_offset);
+ }
+ data += im->width;
+ }
+ }
+ return;
+ case 16:
+ for (y = 0; y < im->height; y++) {
+ for (x = 0; x < im->width; x++) {
+ r = (data[x] >> default_red_shift) & 0xFF;
+ r = r >> _red_shift;
+ g = (data[x] >> default_green_shift) & 0xFF;
+ g = g >> _green_shift;
+ b = (data[x] >> default_blue_shift) & 0xFF;
+ b = b >> _blue_shift;
+ p[x] = (r << _red_offset) + (g << _green_offset) + (b << _blue_offset);
+ }
+ data += im->width;
+ p += im->bytes_per_line/2;
+ }
+ break;
+ default:
+ printf("your bit depth is currently unhandled\n");
+ }