commit 0123b40

Faster 2bpp function

 1@@ -58,18 +58,16 @@ screen_rect(Uint8 *layer, Uint16 x1, Uint16 y1, Uint16 x2, Uint16 y2, int color)
 2 static void
 3 screen_2bpp(Uint8 *layer, Uint8 *ram, Uint16 addr, Uint16 x1, Uint16 y1, Uint16 color, int fx, int fy)
 4 {
 5-	int h, width = uxn_screen.width, height = uxn_screen.height, opaque = (color % 5);
 6-	Uint8 *ch1 = &ram[addr], *ch2 = ch1 + 8, mx = (fx > 0 ? 8 : 0);
 7+	int width = uxn_screen.width, height = uxn_screen.height, opaque = (color % 5);
 8+	Uint8 *ch1 = &ram[addr], *ch2 = ch1 + 8;
 9 	Uint16 y, ymod = (fy < 0 ? 8 : 0), ymax = y1 + ymod + fy * 8;
10-	// Uint16 x, xmod = (fx < 0 ? 8 : 0), xmax = x1 + xmod + fx * 8;
11+	Uint16 x, xmod = (fx > 0 ? 8 : 0), xmax = x1 + xmod - fx * 8;
12 	for(y = y1 + ymod; y != ymax; y += fy) {
13 		Uint16 c = *ch1++ | (*ch2++ << 8);
14-		Uint16 xx = x1 + mx;
15-		for(h = 7; h >= 0; --h, c >>= 1) {
16+		for(x = x1 + xmod; x != xmax; x -= fx, c >>= 1) {
17 			Uint8 ch = (c & 1) | ((c >> 7) & 2);
18-			xx += -fx;
19-			if((opaque || ch) && xx < width && y < height)
20-				layer[xx + y * width] = blending[ch][color];
21+			if((opaque || ch) && x < width && y < height)
22+				layer[x + y * width] = blending[ch][color];
23 		}
24 	}
25 }