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-rw-r--r--lpimage.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/lpimage.c b/lpimage.c
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+++ b/lpimage.c
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+/*
+ * $Id$
+ *
+ * Copyright © 2004 Keith Packard
+ *
+ * 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, and that the name of Keith Packard not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission. Keith Packard makes no
+ * representations about the suitability of this software for any purpose. It
+ * is provided "as is" without express or implied warranty.
+ *
+ * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "lpint.h"
+
+Bool
+create_window_image (light_pipe_window *lpw)
+{
+ int image_size;
+ XGCValues gcv;
+
+ lpw->public.image = XCreateImage (lpw->display,
+ lpw->visual,
+ lpw->depth,
+ ZPixmap,
+ 0,
+ 0,
+ lpw->public.geometry.width,
+ lpw->public.geometry.height,
+ 32,
+ 0);
+ if (!lpw->public.image)
+ return False;
+ image_size = (lpw->public.image->bytes_per_line *
+ lpw->public.geometry.height);
+ if (!image_size)
+ {
+ XDestroyImage (lpw->public.image);
+ return False;
+ }
+ lpw->shm_info.shmid = shmget (IPC_PRIVATE, image_size, IPC_CREAT|0600);
+ if (lpw->shm_info.shmid < 0)
+ {
+ XDestroyImage (lpw->public.image);
+ lpw->public.image = 0;
+ return False;
+ }
+ lpw->shm_info.shmaddr = (char *) shmat (lpw->shm_info.shmid, 0, 0);
+ if (lpw->shm_info.shmaddr == ((char *) -1))
+ {
+ XDestroyImage (lpw->public.image);
+ lpw->public.image = 0;
+ shmctl (lpw->shm_info.shmid, IPC_RMID, 0);
+ return False;
+ }
+ XShmAttach (lpw->display, &lpw->shm_info);
+ lpw->public.image->data = lpw->shm_info.shmaddr;
+ lpw->public.image->obdata = (char *) &lpw->shm_info;
+ lpw->shm_pixmap = XShmCreatePixmap (lpw->display,
+ lpw->window,
+ lpw->public.image->data,
+ &lpw->shm_info,
+ lpw->public.geometry.width,
+ lpw->public.geometry.height,
+ lpw->depth);
+ gcv.graphics_exposures = False;
+ gcv.subwindow_mode = IncludeInferiors;
+ lpw->shm_gc = XCreateGC (lpw->display,
+ lpw->window,
+ GCGraphicsExposures|GCSubwindowMode,
+ &gcv);
+ return True;
+}
+
+void
+destroy_window_image (light_pipe_window *lpw)
+{
+ if (lpw->public.image)
+ {
+ XShmDetach (lpw->display, &lpw->shm_info);
+ XSync (lpw->display, False);
+ (void) shmdt (&lpw->shm_info.shmaddr);
+ (void) shmctl (lpw->shm_info.shmid, IPC_RMID, 0);
+ lpw->public.image->data = 0;
+ lpw->public.image->obdata = 0;
+ XDestroyImage (lpw->public.image);
+ XFreePixmap (lpw->display, lpw->shm_pixmap);
+ XFreeGC (lpw->display, lpw->shm_gc);
+ lpw->public.image = 0;
+ }
+}
+
+void
+update_region (light_pipe_window *lpw, int x, int y, int width, int height)
+{
+ XCopyArea (lpw->display,
+ lpw->window,
+ lpw->shm_pixmap,
+ lpw->shm_gc,
+ x, y, width, height, x, y);
+}