commit 1328521

Faster screen redraw

 1@@ -507,18 +507,22 @@ screen_resize(int width, int height)
 2 static void
 3 screen_redraw(void)
 4 {
 5-	int x, y;
 6 	if(screen_zoom == 1) {
 7-		int colmar = (screen_y1 + 8) * screen_wmar2;
 8-		int *dst = &screen_pixels[screen_y1 * screen_width + screen_x1];
 9-		for(y = screen_y1; y < screen_y2; y++, dst += screen_width, colmar += screen_wmar2) {
10-			int i = (screen_x1 + 8) + colmar;
11-			int *a = dst, *b = a + (screen_x2 - screen_x1);
12-			while(a < b)
13-				*a++ = screen_palette[screen_layers[i++]];
14+		const int colmar = (screen_y1 + 8) * screen_wmar2 + (screen_x1 + 8);
15+		const int row_width = screen_x2 - screen_x1;
16+		const int src_stride = screen_wmar2 - row_width;
17+		const int dst_stride = screen_width - row_width;
18+		int y, *dst_ptr = &screen_pixels[screen_y1 * screen_width + screen_x1];
19+		Uint8 *src_ptr = &screen_layers[colmar];
20+		for(y = screen_y1; y < screen_y2; y++) {
21+			int *dst_end = dst_ptr + row_width;
22+			while(dst_ptr < dst_end)
23+				*dst_ptr++ = screen_palette[*src_ptr++];
24+			dst_ptr += dst_stride;
25+			src_ptr += src_stride;
26 		}
27 	} else {
28-		int i, k, l;
29+		int x, y, i, k, l;
30 		const int stride = screen_width * screen_zoom;
31 		for(y = screen_y1; y < screen_y2; y++) {
32 			const int ys = y * screen_zoom;