1 files changed, 83 insertions, 0 deletions
diff --git a/xorg-server/hw/kdrive/src/kshadow.c b/xorg-server/hw/kdrive/src/kshadow.c
new file mode 100644
index 000000000..ea44812db
--- /dev/null
+++ b/xorg-server/hw/kdrive/src/kshadow.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright © 1999 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <kdrive-config.h>
+#endif
+#include "kdrive.h"
+
+Bool
+KdShadowFbAlloc (KdScreenInfo *screen, int fb, Bool rotate)
+{
+    int	    paddedWidth;
+    void    *buf;
+    int	    width = rotate ? screen->height : screen->width;
+    int	    height = rotate ? screen->width : screen->height;
+    int	    bpp = screen->fb[fb].bitsPerPixel;
+
+    /* use fb computation for width */
+    paddedWidth = ((width * bpp + FB_MASK) >> FB_SHIFT) * sizeof (FbBits);
+    buf = xalloc (paddedWidth * height);
+    if (!buf)
+	return FALSE;
+    if (screen->fb[fb].shadow)
+	xfree (screen->fb[fb].frameBuffer);
+    screen->fb[fb].shadow = TRUE;
+    screen->fb[fb].frameBuffer = buf;
+    screen->fb[fb].byteStride = paddedWidth;
+    screen->fb[fb].pixelStride = paddedWidth * 8 / bpp;
+    return TRUE;
+}
+
+void
+KdShadowFbFree (KdScreenInfo *screen, int fb)
+{
+    if (screen->fb[fb].shadow)
+    {
+	xfree (screen->fb[fb].frameBuffer);
+	screen->fb[fb].frameBuffer = 0;
+	screen->fb[fb].shadow = FALSE;
+    }
+}
+
+Bool
+KdShadowSet (ScreenPtr pScreen, int randr, ShadowUpdateProc update, ShadowWindowProc window)
+{
+    KdScreenPriv(pScreen);
+    KdScreenInfo *screen = pScreenPriv->screen;
+    int	 fb;
+
+    shadowRemove (pScreen, pScreen->GetScreenPixmap(pScreen));
+    for (fb = 0; fb < KD_MAX_FB && screen->fb[fb].depth; fb++)
+    {
+	if (screen->fb[fb].shadow)
+            return shadowAdd (pScreen, pScreen->GetScreenPixmap(pScreen),
+                              update, window, randr, 0);
+    }
+    return TRUE;
+}
+
+void
+KdShadowUnset (ScreenPtr pScreen)
+{
+    shadowRemove(pScreen, pScreen->GetScreenPixmap(pScreen));
+}