commit 92fa022

Only recompute bounds when they are needed

 1@@ -581,8 +581,8 @@ screen_draw_pixel(void)
 2 static void
 3 screen_draw_sprite(void)
 4 {
 5-	int i, x1, x2, y1, y2, ay, by, qy, x = rX, y = rY, layer_mask;
 6-	int fx, fy, qfx, qfy, dxy, dyx;
 7+	int i, qy, x = rX, y = rY, layer_mask;
 8+	int fx, fy, qfx, qfy, dxy, dyx, row;
 9 	const Uint8 *table;
10 	const int ctrl = dev[0x2f];
11 	const int blend = ctrl & 0xf;
12@@ -606,9 +606,10 @@ screen_draw_sprite(void)
13 			if(xmar2 == xmar + 8 && xmar2 < screen_wmar2 && ymar2 < screen_hmar2) {
14 				const Uint8 *sprite = &ram[rA];
15 				const Uint16 ymar = y + 8;
16-				for(ay = ymar * screen_wmar2, by = ymar2 * screen_wmar2, qy = qfy; ay < by; ay += screen_wmar2, qy += fy) {
17+				const int height = ymar2 - ymar;
18+				Uint8 *dst = &screen_layers[xmar + ymar * screen_wmar2];
19+				for(row = 0, qy = qfy; row < height; row++, dst += screen_wmar2, qy += fy) {
20 					const int ch1 = sprite[qy], ch2 = sprite[qy + 8] << 1;
21-					Uint8 *dst = &screen_layers[xmar + ay];
22 					if(opaque) {
23 						o2BPP(0) o2BPP(1) o2BPP(2) o2BPP(3) o2BPP(4) o2BPP(5) o2BPP(6) o2BPP(7)
24 					} else {
25@@ -624,9 +625,10 @@ screen_draw_sprite(void)
26 			if(xmar2 == xmar + 8 && xmar2 < screen_wmar2 && ymar2 < screen_hmar2) {
27 				const Uint8 *sprite = &ram[rA];
28 				const Uint16 ymar = y + 8;
29-				for(ay = ymar * screen_wmar2, by = ymar2 * screen_wmar2, qy = qfy; ay < by; ay += screen_wmar2, qy += fy) {
30+				const int height = ymar2 - ymar;
31+				Uint8 *dst = &screen_layers[xmar + ymar * screen_wmar2];
32+				for(row = 0, qy = qfy; row < height; row++, dst += screen_wmar2, qy += fy) {
33 					const int ch1 = sprite[qy];
34-					Uint8 *dst = &screen_layers[xmar + ay];
35 					if(opaque) {
36 						o1BPP(0) o1BPP(1) o1BPP(2) o1BPP(3) o1BPP(4) o1BPP(5) o1BPP(6) o1BPP(7)
37 					} else {
38@@ -636,15 +638,18 @@ screen_draw_sprite(void)
39 			}
40 		}
41 	}
42-	if(fx < 0)
43-		x1 = x, x2 = rX;
44-	else
45-		x1 = rX, x2 = x;
46-	if(fy < 0)
47-		y1 = y, y2 = rY;
48-	else
49-		y1 = rY, y2 = y;
50-	if(!screen_reqdraw) screen_change(x1 - 8, y1 - 8, x2 + 8, y2 + 8);
51+	if(!screen_reqdraw) {
52+		int x1, x2, y1, y2;
53+		if(fx < 0)
54+			x1 = x, x2 = rX;
55+		else
56+			x1 = rX, x2 = x;
57+		if(fy < 0)
58+			y1 = y, y2 = rY;
59+		else
60+			y1 = rY, y2 = y;
61+		screen_change(x1 - 8, y1 - 8, x2 + 8, y2 + 8);
62+	}
63 	if(rMX) rX += rDX * fx;
64 	if(rMY) rY += rDY * fy;
65 }