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+/* $Xorg: pixmap.c,v 1.4 2001/02/09 02:04:40 xorgcvs Exp $ */
+/*
+
+Copyright 1993, 1998 The Open Group
+
+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.
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall
+not be used in advertising or otherwise to promote the sale, use or
+other dealings in this Software without prior written authorization
+from The Open Group.
+
+*/
+/* $XFree86: xc/programs/Xserver/dix/pixmap.c,v 3.4 2001/01/17 22:36:44 dawes Exp $ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <X11/X.h>
+#include "scrnintstr.h"
+#include "misc.h"
+#include "os.h"
+#include "windowstr.h"
+#include "resource.h"
+#include "dixstruct.h"
+#include "gcstruct.h"
+#include "servermd.h"
+#include "site.h"
+
+
+/*
+ * Scratch pixmap management and device independent pixmap allocation
+ * function.
+ */
+
+
+/* callable by ddx */
+PixmapPtr
+GetScratchPixmapHeader(ScreenPtr pScreen, int width, int height, int depth,
+ int bitsPerPixel, int devKind, pointer pPixData)
+{
+ PixmapPtr pPixmap = pScreen->pScratchPixmap;
+
+ if (pPixmap)
+ pScreen->pScratchPixmap = NULL;
+ else
+ /* width and height of 0 means don't allocate any pixmap data */
+ pPixmap = (*pScreen->CreatePixmap)(pScreen, 0, 0, depth);
+
+ if (pPixmap) {
+ if ((*pScreen->ModifyPixmapHeader)(pPixmap, width, height, depth,
+ bitsPerPixel, devKind, pPixData))
+ return pPixmap;
+ (*pScreen->DestroyPixmap)(pPixmap);
+ }
+ return NullPixmap;
+}
+
+
+/* callable by ddx */
+void
+FreeScratchPixmapHeader(PixmapPtr pPixmap)
+{
+ if (pPixmap)
+ {
+ ScreenPtr pScreen = pPixmap->drawable.pScreen;
+
+ pPixmap->devPrivate.ptr = NULL; /* lest ddx chases bad ptr */
+ if (pScreen->pScratchPixmap)
+ (*pScreen->DestroyPixmap)(pPixmap);
+ else
+ pScreen->pScratchPixmap = pPixmap;
+ }
+}
+
+
+Bool
+CreateScratchPixmapsForScreen(int scrnum)
+{
+ /* let it be created on first use */
+ screenInfo.screens[scrnum]->pScratchPixmap = NULL;
+ return TRUE;
+}
+
+
+void
+FreeScratchPixmapsForScreen(int scrnum)
+{
+ FreeScratchPixmapHeader(screenInfo.screens[scrnum]->pScratchPixmap);
+}
+
+
+/* callable by ddx */
+PixmapPtr
+AllocatePixmap(ScreenPtr pScreen, int pixDataSize)
+{
+ PixmapPtr pPixmap;
+#ifdef PIXPRIV
+ char *ptr;
+ DevUnion *ppriv;
+ unsigned *sizes;
+ unsigned size;
+ int i;
+
+ if (pScreen->totalPixmapSize > ((size_t)-1) - pixDataSize)
+ return NullPixmap;
+
+ /*
+ * FIXME: Allocate 4 bytes at the end of each pixmap. This
+ * is a quick workaround intended to fix a problem reported
+ * by Valgrind due to fbBlt() writing just after the end of
+ * the pixmap buffer. This may be a RENDER bug.
+ */
+
+ pPixmap = (PixmapPtr)xalloc(pScreen->totalPixmapSize + pixDataSize + 4);
+ if (!pPixmap)
+ return NullPixmap;
+ ppriv = (DevUnion *)(pPixmap + 1);
+ pPixmap->devPrivates = ppriv;
+ sizes = pScreen->PixmapPrivateSizes;
+ ptr = (char *)(ppriv + pScreen->PixmapPrivateLen);
+ for (i = pScreen->PixmapPrivateLen; --i >= 0; ppriv++, sizes++)
+ {
+ if ((size = *sizes) != 0)
+ {
+ ppriv->ptr = (pointer)ptr;
+ ptr += size;
+ }
+ else
+ ppriv->ptr = (pointer)NULL;
+ }
+#else
+ pPixmap = (PixmapPtr)xalloc(sizeof(PixmapRec) + pixDataSize);
+#endif
+ return pPixmap;
+}