commit 557b581

Pre-compute opaque mask

 1@@ -606,7 +606,7 @@ screen_deo_sprite(void)
 2 	const int addr_incr = rMA << (is_2bpp ? 2 : 1);
 3 	const int stride = screen_wmar2;
 4 	const int blend = ctrl & 0xf;
 5-	const int opaque = blend % 5;
 6+	const Uint8 opaque_mask = (blend % 5) ? 0xff : 0x00;
 7 	const Uint8 *table = blend_lut[blend][layer >> 6];
 8 	for(i = 0; i <= rML; i++, x += dx, y += dy, rA += addr_incr) {
 9 		const Uint16 x0 = x + 8, y0 = y + 8;
10@@ -619,7 +619,7 @@ screen_deo_sprite(void)
11 			for(int px = 0, row = row_start; px < 8; px++, d++, row += row_delta) {
12 				const int bit = 1 << row;
13 				const int color = ((ch1 & bit) ? 1 : 0) | ((ch2 & (bit << 1)) ? 2 : 0);
14-				const Uint8 mask = (color | opaque) ? 0xff : 0x00;
15+				const Uint8 mask = -(!!(color | opaque_mask));
16 				const Uint8 value = *d;
17 				*d = (value & ~mask) | (((value & layer_mask) | table[color]) & mask);
18 			}