Index: gtk/image.c
===================================================================
RCS file: /cvsroot/crossfire/client/gtk/image.c,v
retrieving revision 1.26
diff -u -w -r1.26 image.c
--- gtk/image.c	5 Sep 2005 20:16:53 -0000	1.26
+++ gtk/image.c	17 Oct 2005 22:26:23 -0000
@@ -131,8 +131,6 @@
 #if defined(HAVE_SDL)
 	int i;
 	SDL_Surface *fog;
-	uint32 g,*p;
-	uint8 *l;
 
     #if SDL_BYTEORDER == SDL_LIL_ENDIAN
 	pi->map_image = SDL_CreateRGBSurfaceFrom(data, pi->map_width,
@@ -145,7 +143,6 @@
 	SDL_LockSurface(fog);
 
 	for (i=0; i < pi->map_width * pi->map_height; i++) {
-	    l = (uint8 *) (data + i*4);
             /* The effective luminance of a pixel is calculated with the following formula:
              *      Y=0.3RED+0.59GREEN+0.11Blue
              * This is the way you are supposed to convert color to grayscale
@@ -156,9 +153,11 @@
              *
              *                          Tchize 22 May 2004
              */
-            g=(77*(*l)+151*(*(l+1))+28*(*(l+2)))>>8;
-	    p = (uint32*) fog->pixels + i;
-	    *(uint32*) p = g | (g << 8) | (g << 16) | (*(l + 3) << 24);
+	    uint8 g = (77*data[i*4+0]+151*data[i*4+1]+28*data[i*4+2])/256;
+	    ((uint8 *)fog->pixels)[i*4+0] = 0;
+	    ((uint8 *)fog->pixels)[i*4+1] = 0;
+	    ((uint8 *)fog->pixels)[i*4+2] = g;
+	    ((uint8 *)fog->pixels)[i*4+3] = data[i*4+3];
 	}
 
 	SDL_UnlockSurface(fog);
@@ -180,7 +179,6 @@
 	 * on teh screen are reversed.
 	 */
 	for (i=0; i < pi->map_width * pi->map_height; i++) {
-	    l = (uint8 *) (data + i*4);
             /* The effective luminance of a pixel is calculated with the following formula:
              *      Y=0.3RED+0.59GREEN+0.11Blue
              * This is the way you are supposed to convert color to grayscale
@@ -191,9 +189,11 @@
              *
              *                          Tchize 22 May 2004
              */
-            g=(77*(*l)+151*(*(l+1))+28*(*(l+2)))>>8;
-	    p = (uint32*) fog->pixels + i;
-	    *(uint32*) p = (g << 8) | (g << 16) | (g << 24) | *(l + 3);
+	    uint8 g = (77*data[i*4+0]+151*data[i*4+1]+28*data[i*4+2])/256;
+	    ((uint8 *)fog->pixels)[i*4+0] = 0;
+	    ((uint8 *)fog->pixels)[i*4+1] = 0;
+	    ((uint8 *)fog->pixels)[i*4+2] = g;
+	    ((uint8 *)fog->pixels)[i*4+3] = data[i*4+3];
 	}
 
 	for (i=0; i < pi->map_width * pi->map_height; i+= 4) {