Add beginnings of offscreen memory manager.

hw/kdrive/src/koffscreen.c

@@ -0,0 +1,100 @@
+/*
+ * $Id$
+ *
+ * Copyright © 2003 Anders Carlsson
+ *
+ * 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 Anders Carlsson not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission.  Anders Carlsson makes no
+ * representations about the suitability of this software for any purpose.  It
+ * is provided "as is" without express or implied warranty.
+ *
+ * ANDERS CARLSSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL ANDERS CARLSSON 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.
+ */
+/* $Header$ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "kdrive.h"
+
+static unsigned long offGeneration = 0;
+static int offScreenPrivateIndex;
+static int offPixmapPrivateIndex;
+
+typedef struct
+{
+    CARD8 *base;
+    int size;
+
+    CreatePixmapProcPtr CreatePixmap;
+
+    DestroyPixmapProcPtr DestroyPixmap;
+} OffScreenPrivRec, *OffScreenPrivPtr;
+
+typedef struct
+{
+    int score;
+} OffPixmapPrivRec, *OffPixmapPrivPtr;
+
+#define offPixmapPtr(p) OffPixmapPrivPtr pOffPixmap = (OffPixmapPrivPtr) (p)->devPrivates[offPixmapPrivateIndex].ptr
+#define offScreenPriv(s) OffScreenPrivPtr pOffScr = (OffScreenPrivPtr) (s)->devPrivates[offScreenPrivateIndex].ptr
+
+static PixmapPtr
+KdOffscreenCreatePixmap (ScreenPtr pScreen, int w, int h, int depth)
+{
+    offScreenPriv (pScreen);
+    
+    fprintf (stderr, "creating pixmap: %dx%d with depth %d\n", w, h, depth);
+
+    return (* pOffScr->CreatePixmap) (pScreen, w, h, depth);
+}
+
+static Bool
+KdOffscreenDestroyPixmap (PixmapPtr pixmap)
+{
+    offScreenPriv (pixmap->drawable.pScreen);
+
+    return (* pOffScr->DestroyPixmap) (pixmap);
+}
+
+Bool
+KdOffscreenInit (ScreenPtr pScreen, CARD8 *off_screen_memory, int off_screen_size)
+{
+    OffScreenPrivPtr pOffScr;
+
+    fprintf (stderr, "Initializing offscreen manager, size is: %d\n", off_screen_size);
+    
+    if (offGeneration != serverGeneration)
+    {
+	offScreenPrivateIndex = AllocateScreenPrivateIndex ();
+	
+	offGeneration = serverGeneration;
+    }
+
+    AllocatePixmapPrivate (pScreen, offPixmapPrivateIndex, sizeof (OffPixmapPrivRec));
+    
+    pOffScr = xalloc (sizeof (OffScreenPrivRec));
+    pScreen->devPrivates[offScreenPrivateIndex].ptr = pOffScr;
+
+    pOffScr->base = off_screen_memory;
+    pOffScr->size = off_screen_size;
+
+    /* Override functions */
+    pOffScr->CreatePixmap = pScreen->CreatePixmap;
+    pScreen->CreatePixmap = KdOffscreenCreatePixmap;
+    pOffScr->DestroyPixmap = pScreen->DestroyPixmap;
+    pScreen->DestroyPixmap = KdOffscreenDestroyPixmap;
+    
+    return TRUE;
+}