ftp://ftp.linux.ncsu.edu/mirror/ftp.redhat.com/pub/redhat/linux/enterprise/4/en/os...

[xscreensaver] / utils / grabscreen.h

diff --git a/utils/grabscreen.h b/utils/grabscreen.h
index 20a5ce408d6928d71a34805b783b729fdb6089e1..19d01e2aa2e165df4add8aeb37cf9426d1e98875 100644 (file)
--- a/utils/grabscreen.h
+++ b/utils/grabscreen.h
@@ -1,5 +1,5 @@
-/* xscreensaver, Copyright (c) 1992, 1993, 1994, 1997
- *  Jamie Zawinski <jwz@netscape.com>
+/* xscreensaver, Copyright (c) 1992, 1993, 1994, 1997, 2001, 2003, 2004
+ *  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
@@ -13,10 +13,60 @@
 #ifndef __GRABSCREEN_H__
 #define __GRABSCREEN_H__
 
-/* This will write a snapshot of the screen image into the given window.
-   Beware that the colormap of the window may also be changed (to match
-   the bits that were drawn.)
+/* This will write an image onto the given Drawable.
+   The Drawable (arg 3) may be a Window or a Pixmap.
+
+   The Window must be the top-level window.  The image *may or may not*
+   be written to the window, though it will definitely be written to
+   the drawable.  It's fine for args 2 and 3 to be the same window, or
+   for arg 2 to be a Window, and arg 3 to be a Pixmap.
+
+   The loaded image might be from a file, or from a screen shot of the
+   desktop, or from the system's video input, depending on user
+   preferences.
+
+   If it is from a file, then it will be returned in `filename_return'.
+   filename_return may be NULL; also, NULL may be returned (e.g., if
+   it's a screenshot or video capture.)
+
+   Many colors may be allocated from the window's colormap.
  */
-extern void grab_screen_image (Screen *, Window);
+extern void load_random_image (Screen *screen,
+                               Window top_level_window,
+                               Drawable target_window_or_pixmap, 
+                               char **filename_return);
+
+/* Like the above, but loads the image in the background and runs the
+   given callback once it has been loaded.
+ */
+extern void fork_load_random_image (Screen *screen, Window window,
+                                    Drawable drawable,
+                                    void (*callback) (Screen *, Window,
+                                                      Drawable,
+                                                      const char *name,
+                                                      void *closure),
+                                    void *closure);
+
+
+/* Whether one should use GCSubwindowMode when drawing on this window
+   (assuming a screen image has been grabbed onto it.)  Yes, this is a
+   total kludge. */
+extern Bool use_subwindow_mode_p(Screen *screen, Window window);
+
+/* Whether the given window is:
+   - the real root window;
+   - the virtual root window;
+   - a direct child of the root window;
+   - a direct child of the window manager's decorations.
+ */
+extern Bool top_level_window_p(Screen *screen, Window window);
+
+
+/* Don't call this: this is for the "xscreensaver-getimage" program only. */
+extern void grab_screen_image_internal (Screen *, Window);
+
+/* Don't use this: this is how "xscreensaver-getimage" and "grabclient.c"
+   pass the file name around. */
+#define XA_XSCREENSAVER_IMAGE_FILENAME "_SCREENSAVER_IMAGE_FILENAME"
 
 #endif /* __GRABSCREEN_H__ */