From http://www.jwz.org/xscreensaver/xscreensaver-5.35.tar.gz

[xscreensaver] / hacks / glx / bouncingcow.c

diff --git a/hacks/glx/bouncingcow.c b/hacks/glx/bouncingcow.c
index 968002c4f4d7c18c789a20af23ddb8ae529e8597..a2faf1f8190549e002987f681d8c53b082fdf8db 100644 (file)
--- a/hacks/glx/bouncingcow.c
+++ b/hacks/glx/bouncingcow.c
@@ -471,7 +471,16 @@ draw_cow (ModeInfo *mi)
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
   glPushMatrix ();
-  glRotatef(current_device_rotation(), 0, 0, 1);
+
+# ifdef HAVE_MOBILE    /* Keep it the same relative size when rotated. */
+  {
+    GLfloat h = MI_HEIGHT(mi) / (GLfloat) MI_WIDTH(mi);
+    int o = (int) current_device_rotation();
+    if (o != 0 && o != 180 && o != -180)
+      glScalef (1/h, 1/h, 1/h);
+    glRotatef(o, 0, 0, 1);
+  }
+# endif
 
   glScalef (0.5, 0.5, 0.5);