From http://www.jwz.org/xscreensaver/xscreensaver-5.40.tar.gz

[xscreensaver] / hacks / ximage-loader.h

diff --git a/hacks/ximage-loader.h b/hacks/ximage-loader.h
index f5b714ae7451887ce1b3ebfa8f17b6cfd916ee29..bed163f3ccb556c69260d14b3b153956df8ba9d2 100644 (file)
--- a/hacks/ximage-loader.h
+++ b/hacks/ximage-loader.h
@@ -23,14 +23,15 @@ extern Pixmap image_data_to_pixmap (Display *, Window,
                                     int *width_ret, int *height_ret,
                                     Pixmap *mask_ret);
 
-extern XImage *image_data_to_ximage (Display *, Visual *,
-                                     const unsigned char *image_data,
-                                     unsigned long data_size);
-
 /* This XImage has RGBA data, which is what OpenGL code typically expects.
+   Also it is upside down: the origin is at the bottom left of the image.
    X11 typically expects 0RGB as it has no notion of alpha, only 1-bit masks.
    With X11 code, you should probably use the _pixmap routines instead.
  */
+extern XImage *image_data_to_ximage (Display *, Visual *,
+                                     const unsigned char *image_data,
+                                     unsigned long data_size);
+
 extern XImage *file_to_ximage (Display *, Visual *, const char *filename);
 
 #endif /* _XIMAGE_LOADER_H_ */