From http://www.jwz.org/xscreensaver/xscreensaver-5.39.tar.gz

[xscreensaver] / hacks / ximage-loader.h

diff --git a/hacks/ximage-loader.h b/hacks/ximage-loader.h
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+/* ximage-loader.h --- converts XPM data to Pixmaps.
+ * xscreensaver, Copyright (c) 1998-2018 Jamie Zawinski <jwz@jwz.org>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation.  No representations are made about the suitability of this
+ * software for any purpose.  It is provided "as is" without express or 
+ * implied warranty.
+ */
+
+#ifndef _XIMAGE_LOADER_H_
+#define _XIMAGE_LOADER_H_
+
+extern Pixmap file_to_pixmap (Display *, Window, const char *filename,
+                              int *width_ret, int *height_ret,
+                              Pixmap *mask_ret);
+
+extern Pixmap image_data_to_pixmap (Display *, Window, 
+                                    const unsigned char *image_data,
+                                    unsigned long data_size,
+                                    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.
+   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 *file_to_ximage (Display *, Visual *, const char *filename);
+
+#endif /* _XIMAGE_LOADER_H_ */