initial state (xorg-server 1.10.2)

1 files changed, 765 insertions, 0 deletions

diff --git a/exa/exa_unaccel.c b/exa/exa_unaccel.c
new file mode 100644
index 0000000..bd533c4
--- /dev/null
+++ b/exa/exa_unaccel.c
@@ -0,0 +1,765 @@
+/*
+ *
+ * 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.
+ */
+
+#include "exa_priv.h"
+
+#include "mipict.h"
+
+/*
+ * These functions wrap the low-level fb rendering functions and
+ * synchronize framebuffer/accelerated drawing by stalling until
+ * the accelerator is idle
+ */
+
+/**
+ * Calls exaPrepareAccess with EXA_PREPARE_SRC for the tile, if that is the
+ * current fill style.
+ *
+ * Solid doesn't use an extra pixmap source, and Stippled/OpaqueStippled are
+ * 1bpp and never in fb, so we don't worry about them.
+ * We should worry about them for completeness sake and going forward.
+ */
+void
+exaPrepareAccessGC(GCPtr pGC)
+{
+    if (pGC->stipple)
+        exaPrepareAccess(&pGC->stipple->drawable, EXA_PREPARE_MASK);
+    if (pGC->fillStyle == FillTiled)
+	exaPrepareAccess(&pGC->tile.pixmap->drawable, EXA_PREPARE_SRC);
+}
+
+/**
+ * Finishes access to the tile in the GC, if used.
+ */
+void
+exaFinishAccessGC(GCPtr pGC)
+{
+    if (pGC->fillStyle == FillTiled)
+	exaFinishAccess(&pGC->tile.pixmap->drawable, EXA_PREPARE_SRC);
+    if (pGC->stipple)
+        exaFinishAccess(&pGC->stipple->drawable, EXA_PREPARE_MASK);
+}
+
+#if DEBUG_TRACE_FALL
+char
+exaDrawableLocation(DrawablePtr pDrawable)
+{
+    return exaDrawableIsOffscreen(pDrawable) ? 's' : 'm';
+}
+#endif /* DEBUG_TRACE_FALL */
+
+void
+ExaCheckFillSpans (DrawablePtr pDrawable, GCPtr pGC, int nspans,
+		   DDXPointPtr ppt, int *pwidth, int fSorted)
+{
+    EXA_PRE_FALLBACK_GC(pGC);
+    EXA_FALLBACK(("to %p (%c)\n", pDrawable, exaDrawableLocation(pDrawable)));
+    exaPrepareAccess (pDrawable, EXA_PREPARE_DEST);
+    exaPrepareAccessGC (pGC);
+    pGC->ops->FillSpans (pDrawable, pGC, nspans, ppt, pwidth, fSorted);
+    exaFinishAccessGC (pGC);
+    exaFinishAccess (pDrawable, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK_GC(pGC);
+}
+
+void
+ExaCheckSetSpans (DrawablePtr pDrawable, GCPtr pGC, char *psrc,
+		 DDXPointPtr ppt, int *pwidth, int nspans, int fSorted)
+{
+    EXA_PRE_FALLBACK_GC(pGC);
+    EXA_FALLBACK(("to %p (%c)\n", pDrawable, exaDrawableLocation(pDrawable)));
+    exaPrepareAccess (pDrawable, EXA_PREPARE_DEST);
+    pGC->ops->SetSpans (pDrawable, pGC, psrc, ppt, pwidth, nspans, fSorted);
+    exaFinishAccess (pDrawable, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK_GC(pGC);
+}
+
+void
+ExaCheckPutImage (DrawablePtr pDrawable, GCPtr pGC, int depth,
+		 int x, int y, int w, int h, int leftPad, int format,
+		 char *bits)
+{
+    PixmapPtr pPixmap = exaGetDrawablePixmap(pDrawable);
+    ExaPixmapPriv(pPixmap);
+
+    EXA_PRE_FALLBACK_GC(pGC);
+    EXA_FALLBACK(("to %p (%c)\n", pDrawable, exaDrawableLocation(pDrawable)));
+    if (!pExaScr->prepare_access_reg || !pExaPixmap->pDamage ||
+	exaGCReadsDestination(pDrawable, pGC->planemask, pGC->fillStyle,
+			      pGC->alu, pGC->clientClipType))
+	exaPrepareAccess (pDrawable, EXA_PREPARE_DEST);
+    else
+	pExaScr->prepare_access_reg(pPixmap, EXA_PREPARE_DEST,
+				    DamagePendingRegion(pExaPixmap->pDamage));
+    pGC->ops->PutImage (pDrawable, pGC, depth, x, y, w, h, leftPad, format, bits);
+    exaFinishAccess (pDrawable, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK_GC(pGC);
+}
+
+void
+ExaCheckCopyNtoN (DrawablePtr pSrc, DrawablePtr pDst,  GCPtr pGC,
+	     BoxPtr	pbox, int nbox, int dx, int dy, Bool	reverse, 
+	     Bool upsidedown, Pixel bitplane, void *closure)
+{
+    RegionRec reg;
+    int xoff, yoff;
+    EXA_PRE_FALLBACK_GC(pGC);
+    EXA_FALLBACK(("from %p to %p (%c,%c)\n", pSrc, pDst,
+		  exaDrawableLocation(pSrc), exaDrawableLocation(pDst)));
+
+    if (pExaScr->prepare_access_reg) {
+	PixmapPtr pPixmap = exaGetDrawablePixmap(pSrc);
+
+	exaGetDrawableDeltas(pSrc, pPixmap, &xoff, &yoff);
+	RegionInit(&reg, pbox, nbox);
+	RegionTranslate(&reg, xoff + dx, yoff + dy);
+	pExaScr->prepare_access_reg(pPixmap, EXA_PREPARE_SRC, &reg);
+	RegionUninit(&reg);
+    } else
+	exaPrepareAccess (pSrc, EXA_PREPARE_SRC);
+
+    if (pExaScr->prepare_access_reg &&
+	!exaGCReadsDestination(pDst, pGC->planemask, pGC->fillStyle,
+			       pGC->alu, pGC->clientClipType)) {
+	PixmapPtr pPixmap = exaGetDrawablePixmap(pDst);
+
+	exaGetDrawableDeltas(pSrc, pPixmap, &xoff, &yoff);
+	RegionInit(&reg, pbox, nbox);
+	RegionTranslate(&reg, xoff, yoff);
+	pExaScr->prepare_access_reg(pPixmap, EXA_PREPARE_DEST, &reg);
+	RegionUninit(&reg);
+    } else
+	exaPrepareAccess (pDst, EXA_PREPARE_DEST);
+
+    /* This will eventually call fbCopyNtoN, with some calculation overhead. */
+    while (nbox--) {
+	pGC->ops->CopyArea (pSrc, pDst, pGC, pbox->x1 - pSrc->x + dx, pbox->y1 - pSrc->y + dy, 
+			pbox->x2 - pbox->x1, pbox->y2 - pbox->y1, pbox->x1 - pDst->x, pbox->y1 - pDst->y);
+	pbox++;
+    }
+    exaFinishAccess (pSrc, EXA_PREPARE_SRC);
+    exaFinishAccess (pDst, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK_GC(pGC);
+}
+
+static void
+ExaFallbackPrepareReg(DrawablePtr pDrawable,
+		      GCPtr pGC,
+		      int x, int y, int width, int height,
+		      int index, Bool checkReads)
+{
+    ScreenPtr pScreen = pDrawable->pScreen;
+    ExaScreenPriv(pScreen);
+
+    if (pExaScr->prepare_access_reg &&
+	!(checkReads && exaGCReadsDestination(pDrawable,
+					      pGC->planemask,
+					      pGC->fillStyle,
+					      pGC->alu,
+					      pGC->clientClipType))) {
+	BoxRec box;
+	RegionRec reg;
+	int xoff, yoff;
+	PixmapPtr pPixmap = exaGetDrawablePixmap(pDrawable);
+
+	exaGetDrawableDeltas(pDrawable, pPixmap, &xoff, &yoff);
+	box.x1 = pDrawable->x + x + xoff;
+	box.y1 = pDrawable->y + y + yoff;
+	box.x2 = box.x1 + width;
+	box.y2 = box.y1 + height;
+
+	RegionInit(&reg, &box, 1);
+	pExaScr->prepare_access_reg(pPixmap, index, &reg);
+	RegionUninit(&reg);
+    } else
+	exaPrepareAccess(pDrawable, index);
+}
+
+
+RegionPtr
+ExaCheckCopyArea (DrawablePtr pSrc, DrawablePtr pDst, GCPtr pGC,
+		 int srcx, int srcy, int w, int h, int dstx, int dsty)
+{
+    RegionPtr ret;
+
+    EXA_PRE_FALLBACK_GC(pGC);
+    EXA_FALLBACK(("from %p to %p (%c,%c)\n", pSrc, pDst,
+		  exaDrawableLocation(pSrc), exaDrawableLocation(pDst)));
+    ExaFallbackPrepareReg(pSrc, pGC, srcx, srcy, w, h,
+			  EXA_PREPARE_SRC, FALSE);
+    ExaFallbackPrepareReg(pDst, pGC, dstx, dsty, w, h,
+			  EXA_PREPARE_DEST, TRUE);
+    ret = pGC->ops->CopyArea (pSrc, pDst, pGC, srcx, srcy, w, h, dstx, dsty);
+    exaFinishAccess (pSrc, EXA_PREPARE_SRC);
+    exaFinishAccess (pDst, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK_GC(pGC);
+
+    return ret;
+}
+
+RegionPtr
+ExaCheckCopyPlane (DrawablePtr pSrc, DrawablePtr pDst, GCPtr pGC,
+		  int srcx, int srcy, int w, int h, int dstx, int dsty,
+		  unsigned long bitPlane)
+{
+    RegionPtr ret;
+
+    EXA_PRE_FALLBACK_GC(pGC);
+    EXA_FALLBACK(("from %p to %p (%c,%c)\n", pSrc, pDst,
+		  exaDrawableLocation(pSrc), exaDrawableLocation(pDst)));
+    ExaFallbackPrepareReg(pSrc, pGC, srcx, srcy, w, h,
+			  EXA_PREPARE_SRC, FALSE);
+    ExaFallbackPrepareReg(pDst, pGC, dstx, dsty, w, h,
+			  EXA_PREPARE_DEST, TRUE);
+    ret = pGC->ops->CopyPlane (pSrc, pDst, pGC, srcx, srcy, w, h, dstx, dsty,
+		       bitPlane);
+    exaFinishAccess (pSrc, EXA_PREPARE_SRC);
+    exaFinishAccess (pDst, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK_GC(pGC);
+
+    return ret;
+}
+
+void
+ExaCheckPolyPoint (DrawablePtr pDrawable, GCPtr pGC, int mode, int npt,
+		  DDXPointPtr pptInit)
+{
+    EXA_PRE_FALLBACK_GC(pGC);
+    EXA_FALLBACK(("to %p (%c)\n", pDrawable, exaDrawableLocation(pDrawable)));
+    exaPrepareAccess (pDrawable, EXA_PREPARE_DEST);
+    pGC->ops->PolyPoint (pDrawable, pGC, mode, npt, pptInit);
+    exaFinishAccess (pDrawable, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK_GC(pGC);
+}
+
+void
+ExaCheckPolylines (DrawablePtr pDrawable, GCPtr pGC,
+		  int mode, int npt, DDXPointPtr ppt)
+{
+    EXA_PRE_FALLBACK_GC(pGC);
+    EXA_FALLBACK(("to %p (%c), width %d, mode %d, count %d\n",
+		  pDrawable, exaDrawableLocation(pDrawable),
+		  pGC->lineWidth, mode, npt));
+
+    exaPrepareAccess (pDrawable, EXA_PREPARE_DEST);
+    exaPrepareAccessGC (pGC);
+    pGC->ops->Polylines (pDrawable, pGC, mode, npt, ppt);
+    exaFinishAccessGC (pGC);
+    exaFinishAccess (pDrawable, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK_GC(pGC);
+}
+
+void
+ExaCheckPolySegment (DrawablePtr pDrawable, GCPtr pGC,
+		    int nsegInit, xSegment *pSegInit)
+{
+    EXA_PRE_FALLBACK_GC(pGC);
+    EXA_FALLBACK(("to %p (%c) width %d, count %d\n", pDrawable,
+		  exaDrawableLocation(pDrawable), pGC->lineWidth, nsegInit));
+
+    exaPrepareAccess (pDrawable, EXA_PREPARE_DEST);
+    exaPrepareAccessGC (pGC);
+    pGC->ops->PolySegment (pDrawable, pGC, nsegInit, pSegInit);
+    exaFinishAccessGC (pGC);
+    exaFinishAccess (pDrawable, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK_GC(pGC);
+}
+
+void
+ExaCheckPolyArc (DrawablePtr pDrawable, GCPtr pGC,
+		int narcs, xArc *pArcs)
+{
+    EXA_PRE_FALLBACK_GC(pGC);
+    EXA_FALLBACK(("to %p (%c)\n", pDrawable, exaDrawableLocation(pDrawable)));
+
+    exaPrepareAccess (pDrawable, EXA_PREPARE_DEST);
+    exaPrepareAccessGC (pGC);
+    pGC->ops->PolyArc (pDrawable, pGC, narcs, pArcs);
+    exaFinishAccessGC (pGC);
+    exaFinishAccess (pDrawable, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK_GC(pGC);
+}
+
+void
+ExaCheckPolyFillRect (DrawablePtr pDrawable, GCPtr pGC,
+		     int nrect, xRectangle *prect)
+{
+    EXA_PRE_FALLBACK_GC(pGC);
+    EXA_FALLBACK(("to %p (%c)\n", pDrawable, exaDrawableLocation(pDrawable)));
+
+    exaPrepareAccess (pDrawable, EXA_PREPARE_DEST);
+    exaPrepareAccessGC (pGC);
+    pGC->ops->PolyFillRect (pDrawable, pGC, nrect, prect);
+    exaFinishAccessGC (pGC);
+    exaFinishAccess (pDrawable, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK_GC(pGC);
+}
+
+void
+ExaCheckImageGlyphBlt (DrawablePtr pDrawable, GCPtr pGC,
+		      int x, int y, unsigned int nglyph,
+		      CharInfoPtr *ppci, pointer pglyphBase)
+{
+    EXA_PRE_FALLBACK_GC(pGC);
+    EXA_FALLBACK(("to %p (%c)\n", pDrawable,
+		  exaDrawableLocation(pDrawable)));
+    exaPrepareAccess (pDrawable, EXA_PREPARE_DEST);
+    exaPrepareAccessGC (pGC);
+    pGC->ops->ImageGlyphBlt (pDrawable, pGC, x, y, nglyph, ppci, pglyphBase);
+    exaFinishAccessGC (pGC);
+    exaFinishAccess (pDrawable, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK_GC(pGC);
+}
+
+void
+ExaCheckPolyGlyphBlt (DrawablePtr pDrawable, GCPtr pGC,
+		     int x, int y, unsigned int nglyph,
+		     CharInfoPtr *ppci, pointer pglyphBase)
+{
+    EXA_PRE_FALLBACK_GC(pGC);
+    EXA_FALLBACK(("to %p (%c), style %d alu %d\n", pDrawable,
+		  exaDrawableLocation(pDrawable), pGC->fillStyle, pGC->alu));
+    exaPrepareAccess (pDrawable, EXA_PREPARE_DEST);
+    exaPrepareAccessGC (pGC);
+    pGC->ops->PolyGlyphBlt (pDrawable, pGC, x, y, nglyph, ppci, pglyphBase);
+    exaFinishAccessGC (pGC);
+    exaFinishAccess (pDrawable, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK_GC(pGC);
+}
+
+void
+ExaCheckPushPixels (GCPtr pGC, PixmapPtr pBitmap,
+		   DrawablePtr pDrawable,
+		   int w, int h, int x, int y)
+{
+    EXA_PRE_FALLBACK_GC(pGC);
+    EXA_FALLBACK(("from %p to %p (%c,%c)\n", pBitmap, pDrawable,
+		  exaDrawableLocation(&pBitmap->drawable),
+		  exaDrawableLocation(pDrawable)));
+    ExaFallbackPrepareReg(pDrawable, pGC, x, y, w, h,
+			  EXA_PREPARE_DEST, TRUE);
+    ExaFallbackPrepareReg(&pBitmap->drawable, pGC, 0, 0, w, h,
+			  EXA_PREPARE_SRC, FALSE);
+    exaPrepareAccessGC (pGC);
+    pGC->ops->PushPixels (pGC, pBitmap, pDrawable, w, h, x, y);
+    exaFinishAccessGC (pGC);
+    exaFinishAccess (&pBitmap->drawable, EXA_PREPARE_SRC);
+    exaFinishAccess (pDrawable, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK_GC(pGC);
+}
+
+void
+ExaCheckCopyWindow(WindowPtr pWin, DDXPointRec ptOldOrg, RegionPtr prgnSrc)
+{
+    DrawablePtr pDrawable = &pWin->drawable;
+    ScreenPtr pScreen = pDrawable->pScreen;
+    EXA_PRE_FALLBACK(pScreen);
+    EXA_FALLBACK(("from %p\n", pWin));
+
+    /* Only need the source bits, the destination region will be overwritten */
+    if (pExaScr->prepare_access_reg) {
+	PixmapPtr pPixmap = pScreen->GetWindowPixmap(pWin);
+	int xoff, yoff;
+
+	exaGetDrawableDeltas(&pWin->drawable, pPixmap, &xoff, &yoff);
+	RegionTranslate(prgnSrc, xoff, yoff);
+	pExaScr->prepare_access_reg(pPixmap, EXA_PREPARE_SRC, prgnSrc);
+	RegionTranslate(prgnSrc, -xoff, -yoff);
+    } else
+	exaPrepareAccess(pDrawable, EXA_PREPARE_SRC);
+
+    swap(pExaScr, pScreen, CopyWindow);
+    pScreen->CopyWindow (pWin, ptOldOrg, prgnSrc);
+    swap(pExaScr, pScreen, CopyWindow);
+    exaFinishAccess (pDrawable, EXA_PREPARE_SRC);
+    EXA_POST_FALLBACK(pScreen);
+}
+
+void
+ExaCheckGetImage(DrawablePtr pDrawable, int x, int y, int w, int h,
+		unsigned int format, unsigned long planeMask, char *d)
+{
+    ScreenPtr pScreen = pDrawable->pScreen;
+    EXA_PRE_FALLBACK(pScreen);
+    EXA_FALLBACK(("from %p (%c)\n", pDrawable,
+		  exaDrawableLocation(pDrawable)));
+
+    ExaFallbackPrepareReg(pDrawable, NULL, x, y, w, h,
+			  EXA_PREPARE_SRC, FALSE);
+    swap(pExaScr, pScreen, GetImage);
+    pScreen->GetImage (pDrawable, x, y, w, h, format, planeMask, d);
+    swap(pExaScr, pScreen, GetImage);
+    exaFinishAccess (pDrawable, EXA_PREPARE_SRC);
+    EXA_POST_FALLBACK(pScreen);
+}
+
+void
+ExaCheckGetSpans (DrawablePtr pDrawable,
+		 int wMax,
+		 DDXPointPtr ppt,
+		 int *pwidth,
+		 int nspans,
+		 char *pdstStart)
+{
+    ScreenPtr pScreen = pDrawable->pScreen;
+
+    EXA_PRE_FALLBACK(pScreen);
+    EXA_FALLBACK(("from %p (%c)\n", pDrawable, exaDrawableLocation(pDrawable)));
+    exaPrepareAccess (pDrawable, EXA_PREPARE_SRC);
+    swap(pExaScr, pScreen, GetSpans);
+    pScreen->GetSpans (pDrawable, wMax, ppt, pwidth, nspans, pdstStart);
+    swap(pExaScr, pScreen, GetSpans);
+    exaFinishAccess (pDrawable, EXA_PREPARE_SRC);
+    EXA_POST_FALLBACK(pScreen);
+}
+
+static void
+ExaSrcValidate(DrawablePtr pDrawable,
+	       int x,
+	       int y,
+	       int width,
+	       int height,
+	       unsigned int subWindowMode)
+{
+    ScreenPtr pScreen = pDrawable->pScreen;
+    ExaScreenPriv(pScreen);
+    PixmapPtr pPix = exaGetDrawablePixmap (pDrawable);
+    BoxRec box;
+    RegionRec reg;
+    RegionPtr dst;
+    int xoff, yoff;
+
+    exaGetDrawableDeltas(pDrawable, pPix, &xoff, &yoff);
+
+    box.x1 = x + xoff;
+    box.y1 = y + yoff;
+    box.x2 = box.x1 + width;
+    box.y2 = box.y1 + height;
+
+    dst = (pExaScr->srcPix == pPix) ? &pExaScr->srcReg :
+	&pExaScr->maskReg;
+
+    RegionInit(&reg, &box, 1);
+    RegionUnion(dst, dst, &reg);
+    RegionUninit(&reg);
+
+    if (pExaScr->SavedSourceValidate) {
+        swap(pExaScr, pScreen, SourceValidate);
+        pScreen->SourceValidate(pDrawable, x, y, width, height, subWindowMode);
+        swap(pExaScr, pScreen, SourceValidate);
+    }
+}
+
+static Bool
+ExaPrepareCompositeReg(ScreenPtr  pScreen,
+		       CARD8      op,
+		       PicturePtr pSrc,
+		       PicturePtr pMask,
+		       PicturePtr pDst,
+		       INT16      xSrc,
+		       INT16      ySrc,
+		       INT16      xMask,
+		       INT16      yMask,
+		       INT16      xDst,
+		       INT16      yDst,
+		       CARD16     width,
+		       CARD16     height)
+{
+    RegionRec region;
+    RegionPtr dstReg = NULL;
+    RegionPtr srcReg = NULL;
+    RegionPtr maskReg = NULL;
+    PixmapPtr pSrcPix = NULL;
+    PixmapPtr pMaskPix = NULL;
+    PixmapPtr pDstPix;
+    ExaScreenPriv(pScreen);
+    Bool ret;
+
+
+    RegionNull(&region);
+
+    if (pSrc->pDrawable) {
+	pSrcPix = exaGetDrawablePixmap(pSrc->pDrawable);
+	RegionNull(&pExaScr->srcReg);
+	srcReg = &pExaScr->srcReg;
+	pExaScr->srcPix = pSrcPix;
+	if (pSrc != pDst)
+	    RegionTranslate(pSrc->pCompositeClip,
+			     -pSrc->pDrawable->x,
+			     -pSrc->pDrawable->y);
+    }
+
+    if (pMask && pMask->pDrawable) {
+	pMaskPix = exaGetDrawablePixmap(pMask->pDrawable);
+	RegionNull(&pExaScr->maskReg);
+	maskReg = &pExaScr->maskReg;
+	if (pMask != pDst && pMask != pSrc)
+	    RegionTranslate(pMask->pCompositeClip,
+			     -pMask->pDrawable->x,
+			     -pMask->pDrawable->y);
+    }
+
+    RegionTranslate(pDst->pCompositeClip,
+		     -pDst->pDrawable->x,
+		     -pDst->pDrawable->y);
+
+    pExaScr->SavedSourceValidate = ExaSrcValidate;
+    swap(pExaScr, pScreen, SourceValidate);
+    ret = miComputeCompositeRegion (&region, pSrc, pMask, pDst,
+				    xSrc, ySrc, xMask, yMask,
+				    xDst,
+				    yDst,
+				    width, height);
+    swap(pExaScr, pScreen, SourceValidate);
+
+    RegionTranslate(pDst->pCompositeClip,
+		     pDst->pDrawable->x,
+		     pDst->pDrawable->y);
+    if (pSrc->pDrawable && pSrc != pDst)
+	RegionTranslate(pSrc->pCompositeClip,
+			 pSrc->pDrawable->x,
+			 pSrc->pDrawable->y);
+    if (pMask && pMask->pDrawable && pMask != pDst && pMask != pSrc)
+	RegionTranslate(pMask->pCompositeClip,
+			 pMask->pDrawable->x,
+			 pMask->pDrawable->y);
+
+    if (!ret) {
+	if (srcReg)
+	    RegionUninit(srcReg);
+	if (maskReg)
+	    RegionUninit(maskReg);
+
+	return FALSE;
+    }
+
+    /**
+     * Don't limit alphamaps readbacks for now until we've figured out how that
+     * should be done.
+     */
+
+    if (pSrc->alphaMap && pSrc->alphaMap->pDrawable)
+	pExaScr->prepare_access_reg(exaGetDrawablePixmap(pSrc->alphaMap->pDrawable),
+				    EXA_PREPARE_AUX_SRC,
+				    NULL);
+    if (pMask && pMask->alphaMap && pMask->alphaMap->pDrawable)
+	pExaScr->prepare_access_reg(exaGetDrawablePixmap(pMask->alphaMap->pDrawable),
+				    EXA_PREPARE_AUX_MASK,
+				    NULL);
+
+    if (pSrcPix)
+	pExaScr->prepare_access_reg(pSrcPix,
+				    EXA_PREPARE_SRC,
+				    srcReg);
+
+    if (pMaskPix)
+	pExaScr->prepare_access_reg(pMaskPix,
+				    EXA_PREPARE_MASK,
+				    maskReg);
+
+    if (srcReg)
+	RegionUninit(srcReg);
+    if (maskReg)
+	RegionUninit(maskReg);
+
+    pDstPix = exaGetDrawablePixmap(pDst->pDrawable);
+    if (!exaOpReadsDestination(op)) {
+	int xoff;
+	int yoff;
+
+	exaGetDrawableDeltas (pDst->pDrawable, pDstPix, &xoff, &yoff);
+	RegionTranslate(&region, pDst->pDrawable->x + xoff,
+			 pDst->pDrawable->y + yoff);
+	dstReg = &region;
+    }
+
+    if (pDst->alphaMap && pDst->alphaMap->pDrawable)
+	pExaScr->prepare_access_reg(exaGetDrawablePixmap(pDst->alphaMap->pDrawable),
+				    EXA_PREPARE_AUX_DEST,
+				    dstReg);
+    pExaScr->prepare_access_reg(pDstPix, EXA_PREPARE_DEST, dstReg);
+
+    RegionUninit(&region);
+    return TRUE;
+}
+
+void
+ExaCheckComposite (CARD8      op,
+                   PicturePtr pSrc,
+                   PicturePtr pMask,
+                   PicturePtr pDst,
+                   INT16      xSrc,
+                   INT16      ySrc,
+                   INT16      xMask,
+                   INT16      yMask,
+                   INT16      xDst,
+                   INT16      yDst,
+                   CARD16     width,
+                   CARD16     height)
+{
+    ScreenPtr pScreen = pDst->pDrawable->pScreen;
+    PictureScreenPtr	ps = GetPictureScreen(pScreen);
+    EXA_PRE_FALLBACK(pScreen);
+
+    if (pExaScr->prepare_access_reg) {
+	if (!ExaPrepareCompositeReg(pScreen, op, pSrc, pMask, pDst, xSrc,
+				   ySrc, xMask, yMask, xDst, yDst, width,
+				   height))
+	    goto out_no_clip;
+    } else {
+
+	/* We need to prepare access to any separate alpha maps first,
+	 * in case the driver doesn't support EXA_PREPARE_AUX*,
+	 * in which case EXA_PREPARE_SRC may be used for moving them out.
+	 */
+
+	if (pSrc->alphaMap && pSrc->alphaMap->pDrawable)
+	    exaPrepareAccess(pSrc->alphaMap->pDrawable, EXA_PREPARE_AUX_SRC);
+	if (pMask && pMask->alphaMap && pMask->alphaMap->pDrawable)
+	    exaPrepareAccess(pMask->alphaMap->pDrawable, EXA_PREPARE_AUX_MASK);
+	if (pDst->alphaMap && pDst->alphaMap->pDrawable)
+	    exaPrepareAccess(pDst->alphaMap->pDrawable, EXA_PREPARE_AUX_DEST);
+
+	exaPrepareAccess (pDst->pDrawable, EXA_PREPARE_DEST);
+
+	EXA_FALLBACK(("from picts %p/%p to pict %p\n",
+		      pSrc, pMask, pDst));
+
+	if (pSrc->pDrawable != NULL)
+	    exaPrepareAccess (pSrc->pDrawable, EXA_PREPARE_SRC);
+	if (pMask && pMask->pDrawable != NULL)
+	    exaPrepareAccess (pMask->pDrawable, EXA_PREPARE_MASK);
+    }
+
+    swap(pExaScr, ps, Composite);
+    ps->Composite (op,
+                 pSrc,
+                 pMask,
+                 pDst,
+                 xSrc,
+                 ySrc,
+                 xMask,
+                 yMask,
+                 xDst,
+                 yDst,
+                 width,
+                 height);
+    swap(pExaScr, ps, Composite);
+    if (pMask && pMask->pDrawable != NULL)
+	exaFinishAccess (pMask->pDrawable, EXA_PREPARE_MASK);
+    if (pSrc->pDrawable != NULL)
+	exaFinishAccess (pSrc->pDrawable, EXA_PREPARE_SRC);
+    exaFinishAccess (pDst->pDrawable, EXA_PREPARE_DEST);
+    if (pDst->alphaMap && pDst->alphaMap->pDrawable)
+	exaFinishAccess(pDst->alphaMap->pDrawable, EXA_PREPARE_AUX_DEST);
+    if (pSrc->alphaMap && pSrc->alphaMap->pDrawable)
+	exaFinishAccess(pSrc->alphaMap->pDrawable, EXA_PREPARE_AUX_SRC);
+    if (pMask && pMask->alphaMap && pMask->alphaMap->pDrawable)
+	exaFinishAccess(pMask->alphaMap->pDrawable, EXA_PREPARE_AUX_MASK);
+
+out_no_clip:
+    EXA_POST_FALLBACK(pScreen);
+}
+
+/**
+ * Avoid migration ping-pong when using a mask.
+ */
+void
+ExaCheckGlyphs (CARD8	      op,
+		PicturePtr    pSrc,
+		PicturePtr    pDst,
+		PictFormatPtr maskFormat,
+		INT16	      xSrc,
+		INT16	      ySrc,
+		int	      nlist,
+		GlyphListPtr  list,
+		GlyphPtr      *glyphs)
+{
+    ScreenPtr pScreen = pDst->pDrawable->pScreen;
+    EXA_PRE_FALLBACK(pScreen);
+
+    miGlyphs(op, pSrc, pDst, maskFormat, xSrc, ySrc, nlist, list, glyphs);
+
+    EXA_POST_FALLBACK(pScreen);
+}
+
+void
+ExaCheckAddTraps (PicturePtr	pPicture,
+		  INT16		x_off,
+		  INT16		y_off,
+		  int		ntrap,
+		  xTrap		*traps)
+{
+    ScreenPtr pScreen = pPicture->pDrawable->pScreen;
+    PictureScreenPtr	ps = GetPictureScreen(pScreen);
+    EXA_PRE_FALLBACK(pScreen);
+
+    EXA_FALLBACK(("to pict %p (%c)\n",
+		  exaDrawableLocation(pPicture->pDrawable)));
+    exaPrepareAccess(pPicture->pDrawable, EXA_PREPARE_DEST);
+    swap(pExaScr, ps, AddTraps);
+    ps->AddTraps (pPicture, x_off, y_off, ntrap, traps);
+    swap(pExaScr, ps, AddTraps);
+    exaFinishAccess(pPicture->pDrawable, EXA_PREPARE_DEST);
+    EXA_POST_FALLBACK(pScreen);
+}
+
+/**
+ * Gets the 0,0 pixel of a pixmap.  Used for doing solid fills of tiled pixmaps
+ * that happen to be 1x1.  Pixmap must be at least 8bpp.
+ */
+CARD32
+exaGetPixmapFirstPixel (PixmapPtr pPixmap)
+{
+    switch (pPixmap->drawable.bitsPerPixel) {
+    case 32:
+	{
+	    CARD32 pixel;
+
+	    pPixmap->drawable.pScreen->GetImage(&pPixmap->drawable, 0, 0, 1, 1,
+						ZPixmap, ~0, (char*)&pixel);
+	    return pixel;
+	}
+    case 16:
+	{
+	    CARD16 pixel;
+
+	    pPixmap->drawable.pScreen->GetImage(&pPixmap->drawable, 0, 0, 1, 1,
+						ZPixmap, ~0, (char*)&pixel);
+	    return pixel;
+	}
+    case 8:
+    case 4:
+    case 1:
+	{
+	    CARD8 pixel;
+
+	    pPixmap->drawable.pScreen->GetImage(&pPixmap->drawable, 0, 0, 1, 1,
+						ZPixmap, ~0, (char*)&pixel);
+	    return pixel;
+	}
+    default:
+	FatalError("%s called for invalid bpp %d\n", __func__,
+		   pPixmap->drawable.bitsPerPixel);
+    }
+}