Patch to force a certain window/screen size in SDL games

SDL-1.2.14-x11modes.patch

--- SDL-1.2.14/src/video/x11/SDL_x11modes.c	2009-10-13 01:07:15.000000000 +0200
+++ SDL-1.2.14/src/video/x11/SDL_x11modes.c	2011-12-04 12:34:55.000000000 +0100
@@ -33,7 +33,7 @@
 #include "SDL_x11modes_c.h"
 #include "SDL_x11image_c.h"
 
-/*#define X11MODES_DEBUG*/
+#define X11MODES_DEBUG
 
 #define MAX(a, b)        (a > b ? a : b)
 
@@ -538,6 +538,9 @@
     use_xme = 0;
     screen_w = DisplayWidth(SDL_Display, SDL_Screen);
     screen_h = DisplayHeight(SDL_Display, SDL_Screen);
+#ifdef X11MODES_DEBUG
+    printf("screen_w=%d screen_h=%d\n", screen_w, screen_h);
+#endif
 
 #if SDL_VIDEO_DRIVER_X11_XINERAMA
     /* Query Xinerama extention */
@@ -556,7 +559,7 @@
                 desired = SDL_atoi(variable);
         }
 #ifdef X11MODES_DEBUG
-        printf("X11 detected Xinerama:\n");
+        printf("X11 detected Xinerama. desired=%d\n", desired);
 #endif
         xinerama = SDL_NAME(XineramaQueryScreens)(SDL_Display, &screens);
         for ( i = 0; i < screens; i++ ) {
@@ -841,6 +844,43 @@
         XFree(pf);
     }
 
+    char * videoSize = getenv( "SDL_VIDEO_SIZE" );
+    if ( videoSize ) {
+	char * splitPos = strchr( videoSize, 'x' );
+	if( ! splitPos ) {
+	    fprintf(stderr, "Unexpected value in SDL_VIDEO_SIZE: Missing 'x' %s\n", videoSize);
+	}
+	char buffer[64];
+	strncpy( buffer, videoSize, sizeof( buffer ) - 1 );
+	char * ptr = strtok(buffer, "x");
+
+	int width = atoi(ptr);
+	ptr = strtok(NULL, "x");
+	int height = atoi(ptr);
+
+	printf("Overriding size: %d x %d\n", width, height);
+
+        if ( SDL_modelist ) {
+            for ( i = 0; SDL_modelist[i]; ++i ) {
+                SDL_free(SDL_modelist[i]);
+            }
+            SDL_free(SDL_modelist);
+        }
+        SDL_modelist = (SDL_Rect **)SDL_malloc(2*sizeof(SDL_Rect *));
+        if ( !SDL_modelist ) {
+            SDL_OutOfMemory();
+            return -1;
+        }
+
+	SDL_modelist[0] = (SDL_Rect *)SDL_malloc(sizeof(SDL_Rect));
+        SDL_modelist[0]->x = 0;
+        SDL_modelist[0]->y = 0;
+        SDL_modelist[0]->w = width;
+        SDL_modelist[0]->h = height;
+
+	SDL_modelist[1] = NULL;
+    }
+
     if ( SDL_modelist == NULL ) {
         SDL_modelist = (SDL_Rect **)SDL_malloc((1+1)*sizeof(SDL_Rect *));
         if ( !SDL_modelist ) {