exa: A simple 3rd backend implementation.

- Based on driver pixmaps with some changes (completely transparent to driver).
- It helps with the problem of known software fallbacks, such as trapezoids.
- exaDoMigration is now called for all cases that provide a do_migration hook.
- exa_migration.c is renamed to exa_migration_classic.c

10 files changed, 460 insertions, 58 deletions

diff --git a/exa/Makefile.am b/exa/Makefile.am
index bf2c138d8..8b759cd76 100644
--- a/exa/Makefile.am
+++ b/exa/Makefile.am
@@ -18,8 +18,10 @@ libexa_la_SOURCES = \
 	exa.c \
 	exa.h \
 	exa_classic.c \
-	exa_migration.c \
+	exa_migration_classic.c \
 	exa_driver.c \
+	exa_mixed.c \
+	exa_migration_mixed.c \
 	exa_accel.c \
 	exa_glyphs.c \
 	exa_offscreen.c \
diff --git a/exa/exa.c b/exa/exa.c
index 0f3716894..fd9ba9001 100644
--- a/exa/exa.c
+++ b/exa/exa.c
@@ -217,6 +217,22 @@ exaSetFbPitch(ExaScreenPrivPtr pExaScr, ExaPixmapPrivPtr pExaPixmap,
 }
 
 /**
+ * Returns TRUE if the pixmap is not movable.  This is the case where it's a
+ * pixmap which has no private (almost always bad) or it's a scratch pixmap created by
+ * some X Server internal component (the score says it's pinned).
+ */
+Bool
+exaPixmapIsPinned (PixmapPtr pPix)
+{
+    ExaPixmapPriv (pPix);
+
+    if (pExaPixmap == NULL)
+	EXA_FatalErrorDebugWithRet(("EXA bug: exaPixmapIsPinned was called on a non-exa pixmap.\n"), TRUE);
+
+    return pExaPixmap->score == EXA_PIXMAP_SCORE_PINNED;
+}
+
+/**
  * exaPixmapIsOffscreen() is used to determine if a pixmap is in offscreen
  * memory, meaning that acceleration could probably be done to it, and that it
  * will need to be wrapped by PrepareAccess()/FinishAccess() when accessing it
@@ -237,7 +253,7 @@ exaPixmapIsOffscreen(PixmapPtr pPixmap)
     if (!(pExaScr->info->flags & EXA_OFFSCREEN_PIXMAPS))
 	return FALSE;
 
-    return pExaScr->pixmap_is_offscreen(pPixmap);
+    return (*pExaScr->pixmap_is_offscreen)(pPixmap);
 }
 
 /**
@@ -348,9 +364,9 @@ void
 exaPrepareAccessReg(DrawablePtr pDrawable, int index, RegionPtr pReg)
 {
     PixmapPtr pPixmap = exaGetDrawablePixmap (pDrawable);
-    ExaPixmapPriv(pPixmap);
+    ExaScreenPriv(pPixmap->drawable.pScreen);
 
-    if (pExaPixmap->pDamage) {
+    if (pExaScr->do_migration) {
 	ExaMigrationRec pixmaps[1];
 
 	if (index == EXA_PREPARE_DEST || index == EXA_PREPARE_AUX_DEST) {
@@ -1037,11 +1053,19 @@ exaDriverInit (ScreenPtr		pScreen,
 	    return FALSE;
         }
 	if (pExaScr->info->flags & EXA_HANDLES_PIXMAPS) {
-	    wrap(pExaScr, pScreen, CreatePixmap, exaCreatePixmap_driver);
-	    wrap(pExaScr, pScreen, DestroyPixmap, exaDestroyPixmap_driver);
-	    wrap(pExaScr, pScreen, ModifyPixmapHeader, exaModifyPixmapHeader_driver);
-	    pExaScr->do_migration = NULL;
-	    pExaScr->pixmap_is_offscreen = exaPixmapIsOffscreen_driver;
+	    if (pExaScr->info->flags & EXA_MIXED_PIXMAPS) {
+		wrap(pExaScr, pScreen, CreatePixmap, exaCreatePixmap_mixed);
+		wrap(pExaScr, pScreen, DestroyPixmap, exaDestroyPixmap_mixed);
+		wrap(pExaScr, pScreen, ModifyPixmapHeader, exaModifyPixmapHeader_mixed);
+		pExaScr->do_migration = exaDoMigration_mixed;
+		pExaScr->pixmap_is_offscreen = exaPixmapIsOffscreen_mixed;
+	    } else {
+		wrap(pExaScr, pScreen, CreatePixmap, exaCreatePixmap_driver);
+		wrap(pExaScr, pScreen, DestroyPixmap, exaDestroyPixmap_driver);
+		wrap(pExaScr, pScreen, ModifyPixmapHeader, exaModifyPixmapHeader_driver);
+		pExaScr->do_migration = NULL;
+		pExaScr->pixmap_is_offscreen = exaPixmapIsOffscreen_driver;
+	    }
 	} else {
 	    wrap(pExaScr, pScreen, CreatePixmap, exaCreatePixmap_classic);
 	    wrap(pExaScr, pScreen, DestroyPixmap, exaDestroyPixmap_classic);
@@ -1162,5 +1186,5 @@ exaDoMigration (ExaMigrationPtr pixmaps, int npixmaps, Bool can_accel)
 	return;
 
     if (pExaScr->do_migration)
-	pExaScr->do_migration(pixmaps, npixmaps, can_accel);
+	(*pExaScr->do_migration)(pixmaps, npixmaps, can_accel);
 }
diff --git a/exa/exa.h b/exa/exa.h
index 1d2c6a9e6..40ac1ddba 100644
--- a/exa/exa.h
+++ b/exa/exa.h
@@ -758,6 +758,13 @@ typedef struct _ExaDriver {
  */
 #define EXA_SUPPORTS_OFFSCREEN_OVERLAPS (1 << 5)
 
+/**
+ * EXA_MIXED_PIXMAPS will hide unacceleratable pixmaps from drivers and manage the
+ * problem known software fallbacks like trapezoids. This only migrates pixmaps one way
+ * into a driver pixmap and then pins it.
+ */
+#define EXA_MIXED_PIXMAPS (1 << 6)
+
 /** @} */
 
 /* in exa.c */
diff --git a/exa/exa_accel.c b/exa/exa_accel.c
index bc970bbe1..33fbb9843 100644
--- a/exa/exa_accel.c
+++ b/exa/exa_accel.c
@@ -57,7 +57,9 @@ exaFillSpans(DrawablePtr pDrawable, GCPtr pGC, int n,
     {
 	ExaCheckFillSpans (pDrawable, pGC, n, ppt, pwidth, fSorted);
 	return;
-    } else if (pExaPixmap->pDamage) {
+    }
+
+    if (pExaScr->do_migration) {
 	ExaMigrationRec pixmaps[1];
 
 	pixmaps[0].as_dst = TRUE;
@@ -165,10 +167,10 @@ exaDoPutImage (DrawablePtr pDrawable, GCPtr pGC, int depth, int x, int y,
     if (pExaScr->swappedOut)
 	return FALSE;
 
-    if (pExaPixmap->pDamage) {
+    if (pExaScr->do_migration) {
 	ExaMigrationRec pixmaps[1];
 
- 	pixmaps[0].as_dst = TRUE;
+	pixmaps[0].as_dst = TRUE;
 	pixmaps[0].as_src = FALSE;
 	pixmaps[0].pPix = pPix;
 	pixmaps[0].pReg = DamagePendingRegion(pExaPixmap->pDamage);
@@ -455,7 +457,7 @@ exaHWCopyNtoN (DrawablePtr    pSrcDrawable,
         }
     }
 
-    if (pDstExaPixmap->pDamage || pSrcExaPixmap->pDamage) {
+    if (pExaScr->do_migration) {
 	ExaMigrationRec pixmaps[2];
 
 	pixmaps[0].as_dst = TRUE;
@@ -466,6 +468,7 @@ exaHWCopyNtoN (DrawablePtr    pSrcDrawable,
 	pixmaps[1].as_src = TRUE;
 	pixmaps[1].pPix = pSrcPixmap;
 	pixmaps[1].pReg = srcregion;
+
 	exaDoMigration (pixmaps, 2, TRUE);
     }
 
@@ -809,7 +812,7 @@ exaPolyFillRect(DrawablePtr pDrawable,
 	goto fallback;
     }
 
-    if (pExaPixmap->pDamage) {
+    if (pExaScr->do_migration) {
 	ExaMigrationRec pixmaps[1];
 
 	pixmaps[0].as_dst = TRUE;
@@ -982,17 +985,16 @@ exaFillRegionSolid (DrawablePtr	pDrawable, RegionPtr pRegion, Pixel pixel,
     REGION_TRANSLATE(pScreen, pRegion, xoff, yoff);
 
     if (pExaPixmap->accel_blocked)
-    {
 	goto out;
-    } else if (pExaPixmap->pDamage) {
+
+    if (pExaScr->do_migration) {
 	ExaMigrationRec pixmaps[1];
 
 	pixmaps[0].as_dst = TRUE;
 	pixmaps[0].as_src = FALSE;
 	pixmaps[0].pPix = pPixmap;
 	pixmaps[0].pReg = exaGCReadsDestination(pDrawable, planemask, FillSolid,
-						alu, clientClipType)
-	    ? NULL : pRegion;
+						alu, clientClipType) ? NULL : pRegion;
 
 	exaDoMigration (pixmaps, 1, TRUE);
     }
@@ -1078,17 +1080,16 @@ exaFillRegionTiled (DrawablePtr pDrawable, RegionPtr pRegion, PixmapPtr pTile,
     pExaPixmap = ExaGetPixmapPriv (pPixmap);
 
     if (pExaPixmap->accel_blocked || pTileExaPixmap->accel_blocked)
-    {
 	return FALSE;
-    } else if (pExaPixmap->pDamage || pTileExaPixmap->pDamage) {
+
+    if (pExaScr->do_migration) {
 	ExaMigrationRec pixmaps[2];
 
 	pixmaps[0].as_dst = TRUE;
 	pixmaps[0].as_src = FALSE;
 	pixmaps[0].pPix = pPixmap;
 	pixmaps[0].pReg = exaGCReadsDestination(pDrawable, planemask, FillTiled,
-						alu, clientClipType)
-	    ? NULL : pRegion;
+						alu, clientClipType) ? NULL : pRegion;
 	pixmaps[1].as_dst = FALSE;
 	pixmaps[1].as_src = TRUE;
 	pixmaps[1].pPix = pTile;
@@ -1233,20 +1234,19 @@ exaGetImage (DrawablePtr pDrawable, int x, int y, int w, int h,
 {
     ExaScreenPriv (pDrawable->pScreen);
     PixmapPtr pPix = exaGetDrawablePixmap (pDrawable);
-    ExaPixmapPrivPtr pExaPixmap = ExaGetPixmapPriv (pPix);
     int xoff, yoff;
     Bool ok;
 
     if (pExaScr->swappedOut)
 	goto fallback;
 
-    if (pExaPixmap->pDamage) {
+    exaGetDrawableDeltas (pDrawable, pPix, &xoff, &yoff);
+
+    if (pExaScr->do_migration) {
 	BoxRec Box;
 	RegionRec Reg;
 	ExaMigrationRec pixmaps[1];
 
-	exaGetDrawableDeltas (pDrawable, pPix, &xoff, &yoff);
-
 	Box.x1 = pDrawable->y + x + xoff;
 	Box.y1 = pDrawable->y + y + yoff;
 	Box.x2 = Box.x1 + w;
diff --git a/exa/exa_glyphs.c b/exa/exa_glyphs.c
index 1855de1b1..d621ccf76 100644
--- a/exa/exa_glyphs.c
+++ b/exa/exa_glyphs.c
@@ -385,10 +385,10 @@ exaGlyphCacheUploadGlyph(ScreenPtr         pScreen,
     if (pGlyphPixmap->drawable.bitsPerPixel != pCachePixmap->drawable.bitsPerPixel)
 	goto composite;
 
-    /* cache pixmap must be offscreen. */
-    if (pExaPixmap->pDamage) {
+    if (pExaScr->do_migration) {
 	ExaMigrationRec pixmaps[1];
 
+	/* cache pixmap must be offscreen. */
 	pixmaps[0].as_dst = TRUE;
 	pixmaps[0].as_src = FALSE;
 	pixmaps[0].pPix = pCachePixmap;
diff --git a/exa/exa_migration.c b/exa/exa_migration_classic.c
index afab9d2f4..83559593f 100644
--- a/exa/exa_migration.c
+++ b/exa/exa_migration_classic.c
@@ -42,22 +42,6 @@
 #endif
 
 /**
- * Returns TRUE if the pixmap is not movable.  This is the case where it's a
- * pixmap which has no private (almost always bad) or it's a scratch pixmap created by
- * some X Server internal component (the score says it's pinned).
- */
-static Bool
-exaPixmapIsPinned (PixmapPtr pPix)
-{
-    ExaPixmapPriv (pPix);
-
-    if (pExaPixmap == NULL)
-	EXA_FatalErrorDebugWithRet(("EXA bug: exaPixmapIsPinned was called on a non-exa pixmap.\n"), TRUE);
-
-    return pExaPixmap->score == EXA_PIXMAP_SCORE_PINNED;
-}
-
-/**
  * The fallback path for UTS/DFS failing is to just memcpy.  exaCopyDirtyToSys
  * and exaCopyDirtyToFb both needed to do this loop.
  */
@@ -77,7 +61,7 @@ exaMemcpyBox (PixmapPtr pPixmap, BoxPtr pbox, CARD8 *src, int src_pitch,
 	dst += dst_pitch;
     }
 }
- 
+
 /**
  * Returns TRUE if the pixmap is dirty (has been modified in its current
  * location compared to the other), or lacks a private for tracking
diff --git a/exa/exa_migration_mixed.c b/exa/exa_migration_mixed.c
new file mode 100644
index 000000000..475b76a63
--- /dev/null
+++ b/exa/exa_migration_mixed.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright © 2009 Maarten Maathuis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <string.h>
+
+#include "exa_priv.h"
+#include "exa.h"
+
+static void
+exaUploadFallback(PixmapPtr pPixmap, CARD8 *src, int src_pitch,
+	      CARD8 *dst, int dst_pitch)
+ {
+    int i;
+
+    for (i = pPixmap->drawable.height; i; i--) {
+	memcpy (dst, src, min(src_pitch, dst_pitch));
+	src += src_pitch;
+	dst += dst_pitch;
+    }
+}
+
+void
+exaCreateDriverPixmap_mixed(PixmapPtr pPixmap)
+{
+    ScreenPtr pScreen = pPixmap->drawable.pScreen;
+    ExaScreenPriv(pScreen);
+    ExaPixmapPriv(pPixmap);
+    void *sys_buffer = pExaPixmap->sys_ptr;
+    int w = pPixmap->drawable.width, h = pPixmap->drawable.height;
+    int depth = pPixmap->drawable.depth, bpp = pPixmap->drawable.bitsPerPixel;
+    int usage_hint = pPixmap->usage_hint;
+    int sys_pitch = pExaPixmap->sys_pitch;
+    int paddedWidth = sys_pitch;
+
+    /* Already done. */
+    if (pExaPixmap->driverPriv)
+	return;
+
+    if (exaPixmapIsPinned(pPixmap))
+	return;
+
+    /* Can't accel 1/4 bpp. */
+    if (pExaPixmap->accel_blocked || bpp < 8)
+	return;
+
+    if (paddedWidth < pExaPixmap->fb_pitch)
+        paddedWidth = pExaPixmap->fb_pitch;
+
+    if (pExaScr->info->CreatePixmap2)
+	pExaPixmap->driverPriv = pExaScr->info->CreatePixmap2(pScreen, w, h, depth, usage_hint, bpp);
+    else
+	pExaPixmap->driverPriv = pExaScr->info->CreatePixmap(pScreen, paddedWidth*h, 0);
+
+    if (!pExaPixmap->driverPriv)
+	return;
+
+    pExaPixmap->offscreen = TRUE;
+    pExaPixmap->sys_ptr = NULL;
+
+    pExaPixmap->score = EXA_PIXMAP_SCORE_PINNED;
+    (*pScreen->ModifyPixmapHeader)(pPixmap, w, h, 0, 0,
+				paddedWidth, NULL);
+
+    /* scratch pixmaps */
+    if (!w || !h)
+	goto finish;
+
+    if (!pExaScr->info->UploadToScreen)
+	goto fallback;
+
+    if (pExaScr->info->UploadToScreen(pPixmap, 0, 0, w, h, sys_buffer, sys_pitch))
+	goto finish;
+
+fallback:
+    ExaDoPrepareAccess(&pPixmap->drawable, EXA_PREPARE_DEST);
+    exaUploadFallback(pPixmap, sys_buffer, sys_pitch, pPixmap->devPrivate.ptr,
+	exaGetPixmapPitch(pPixmap));
+    exaFinishAccess(&pPixmap->drawable, EXA_PREPARE_DEST);
+
+finish:
+    free(sys_buffer);
+}
+
+void
+exaDoMigration_mixed(ExaMigrationPtr pixmaps, int npixmaps, Bool can_accel)
+{
+    int i;
+
+    /* If anything is pinned in system memory, we won't be able to
+     * accelerate.
+     */
+    for (i = 0; i < npixmaps; i++) {
+	if (exaPixmapIsPinned (pixmaps[i].pPix) &&
+	    !exaPixmapIsOffscreen (pixmaps[i].pPix))
+	{
+	    can_accel = FALSE;
+	    break;
+	}
+    }
+
+    /* We can do nothing. */
+    if (!can_accel)
+	return;
+
+    for (i = 0; i < npixmaps; i++) {
+	PixmapPtr pPixmap = pixmaps[i].pPix;
+	ExaPixmapPriv(pPixmap);
+	if (!pExaPixmap->driverPriv)
+	    exaCreateDriverPixmap_mixed(pPixmap);
+    }
+}
diff --git a/exa/exa_mixed.c b/exa/exa_mixed.c
new file mode 100644
index 000000000..26406c42f
--- /dev/null
+++ b/exa/exa_mixed.c
@@ -0,0 +1,229 @@
+/*
+ * Copyright © 2009 Maarten Maathuis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <string.h>
+
+#include "exa_priv.h"
+#include "exa.h"
+
+/* This file holds the driver allocated pixmaps + better initial placement code.
+ * A pinned pixmap implies one that is either driver based already or otherwise altered.
+ * Proper care is taken to free the initially allocated buffer.
+ */
+
+static _X_INLINE void*
+ExaGetPixmapAddress(PixmapPtr p)
+{
+    ExaPixmapPriv(p);
+
+    return pExaPixmap->sys_ptr;
+}
+
+/**
+ * exaCreatePixmap() creates a new pixmap.
+ *
+ * Pixmaps are always marked as pinned, unless the pixmap can still be transfered to a
+ * driver pixmaps.
+ */
+PixmapPtr
+exaCreatePixmap_mixed(ScreenPtr pScreen, int w, int h, int depth,
+		unsigned usage_hint)
+{
+    PixmapPtr pPixmap;
+    ExaPixmapPrivPtr	pExaPixmap;
+    int bpp;
+    size_t paddedWidth, datasize;
+    ExaScreenPriv(pScreen);
+
+    if (w > 32767 || h > 32767)
+	return NullPixmap;
+
+    swap(pExaScr, pScreen, CreatePixmap);
+    pPixmap = pScreen->CreatePixmap(pScreen, 0, 0, depth, usage_hint);
+    swap(pExaScr, pScreen, CreatePixmap);
+
+    if (!pPixmap)
+        return NULL;
+
+    pExaPixmap = ExaGetPixmapPriv(pPixmap);
+    pExaPixmap->driverPriv = NULL;
+
+    bpp = pPixmap->drawable.bitsPerPixel;
+
+    paddedWidth = ((w * bpp + FB_MASK) >> FB_SHIFT) * sizeof(FbBits);
+    if (paddedWidth / 4 > 32767 || h > 32767)
+        return NullPixmap;
+
+    datasize = h * paddedWidth;
+
+    /* Allocate temporary pixmap. */
+    pExaPixmap->sys_ptr = malloc(datasize);
+    pExaPixmap->sys_pitch = paddedWidth;
+
+    if (!pExaPixmap->sys_ptr) {
+	swap(pExaScr, pScreen, DestroyPixmap);
+	pScreen->DestroyPixmap (pPixmap);
+	swap(pExaScr, pScreen, DestroyPixmap);
+	return NULL;
+    }
+
+    pExaPixmap->area = NULL;
+    pExaPixmap->offscreen = FALSE;
+    pExaPixmap->score = EXA_PIXMAP_SCORE_INIT;
+    pExaPixmap->fb_ptr = NULL;
+    pExaPixmap->pDamage = NULL;
+
+    exaSetFbPitch(pExaScr, pExaPixmap, w, h, bpp);
+    exaSetAccelBlock(pExaScr, pExaPixmap,
+	w, h, bpp);
+
+    /* A scratch pixmap will become a driver pixmap right away. */
+    if (!w || !h) {
+	exaCreateDriverPixmap_mixed(pPixmap);
+    } else {
+	/* Avoid freeing sys_ptr. */
+	pExaPixmap->score = EXA_PIXMAP_SCORE_PINNED;
+
+	(*pScreen->ModifyPixmapHeader)(pPixmap, w, h, 0, 0,
+					paddedWidth, NULL);
+
+	/* We want to be able to copy the pixmap to driver memory later on. */
+	pExaPixmap->score = EXA_PIXMAP_SCORE_INIT;
+    }
+
+    return pPixmap;
+}
+
+Bool
+exaModifyPixmapHeader_mixed(PixmapPtr pPixmap, int width, int height, int depth,
+		      int bitsPerPixel, int devKind, pointer pPixData)
+{
+    ScreenPtr pScreen = pPixmap->drawable.pScreen;
+    ExaScreenPrivPtr pExaScr;
+    ExaPixmapPrivPtr pExaPixmap;
+    Bool ret;
+
+    if (!pPixmap)
+        return FALSE;
+
+    pExaScr = ExaGetScreenPriv(pScreen);
+    pExaPixmap = ExaGetPixmapPriv(pPixmap);
+
+    if (pExaPixmap) {
+        if (pPixData) {
+	    if (!exaPixmapIsPinned(pPixmap))
+		free(pExaPixmap->sys_ptr);
+            pExaPixmap->sys_ptr = pPixData;
+	}
+
+        if (devKind > 0)
+            pExaPixmap->sys_pitch = devKind;
+
+        if (width > 0 && height > 0 && bitsPerPixel > 0) {
+            exaSetFbPitch(pExaScr, pExaPixmap,
+                          width, height, bitsPerPixel);
+
+            exaSetAccelBlock(pExaScr, pExaPixmap,
+                             width, height, bitsPerPixel);
+        }
+
+	/* Anything can happen, don't try to predict it all. */
+	pExaPixmap->score = EXA_PIXMAP_SCORE_PINNED;
+    }
+
+    /* Only pass driver pixmaps to the driver. */
+    if (pExaScr->info->ModifyPixmapHeader && pExaPixmap->driverPriv) {
+	ret = pExaScr->info->ModifyPixmapHeader(pPixmap, width, height, depth,
+						bitsPerPixel, devKind, pPixData);
+	/* For EXA_HANDLES_PIXMAPS, we set pPixData to NULL.
+	 * If pPixmap->devPrivate.ptr is non-NULL, then we've got a non-offscreen pixmap.
+	 * We need to store the pointer, because PrepareAccess won't be called.
+	 */
+	if (!pPixData && pPixmap->devPrivate.ptr && pPixmap->devKind) {
+	    pExaPixmap->sys_ptr = pPixmap->devPrivate.ptr;
+	    pExaPixmap->sys_pitch = pPixmap->devKind;
+	}
+	if (ret == TRUE)
+	    goto out;
+    }
+
+    swap(pExaScr, pScreen, ModifyPixmapHeader);
+    ret = pScreen->ModifyPixmapHeader(pPixmap, width, height, depth,
+					    bitsPerPixel, devKind, pPixData);
+    swap(pExaScr, pScreen, ModifyPixmapHeader);
+
+out:
+    /* Always NULL this, we don't want lingering pointers. */
+    pPixmap->devPrivate.ptr = NULL;
+
+    return ret;
+}
+
+Bool
+exaDestroyPixmap_mixed(PixmapPtr pPixmap)
+{
+    ScreenPtr	pScreen = pPixmap->drawable.pScreen;
+    ExaScreenPriv(pScreen);
+    Bool ret;
+
+    if (pPixmap->refcnt == 1)
+    {
+	ExaPixmapPriv (pPixmap);
+
+	if (pExaPixmap->driverPriv)
+	    pExaScr->info->DestroyPixmap(pScreen, pExaPixmap->driverPriv);
+	else if (pExaPixmap->sys_ptr && !exaPixmapIsPinned(pPixmap))
+	    free(pExaPixmap->sys_ptr);
+	pExaPixmap->driverPriv = NULL;
+	pExaPixmap->sys_ptr = NULL;
+    }
+
+    swap(pExaScr, pScreen, DestroyPixmap);
+    ret = pScreen->DestroyPixmap (pPixmap);
+    swap(pExaScr, pScreen, DestroyPixmap);
+
+    return ret;
+}
+
+Bool
+exaPixmapIsOffscreen_mixed(PixmapPtr pPixmap)
+{
+    ScreenPtr pScreen = pPixmap->drawable.pScreen;
+    ExaScreenPriv(pScreen);
+    ExaPixmapPriv(pPixmap);
+    Bool ret;
+
+    if (!pExaPixmap->driverPriv)
+	return FALSE;
+
+    pPixmap->devPrivate.ptr = ExaGetPixmapAddress(pPixmap);
+    ret = pExaScr->info->PixmapIsOffscreen(pPixmap);
+    pPixmap->devPrivate.ptr = NULL;
+
+    return ret;
+}
diff --git a/exa/exa_priv.h b/exa/exa_priv.h
index 3c3451377..620bc67a4 100644
--- a/exa/exa_priv.h
+++ b/exa/exa_priv.h
@@ -547,6 +547,9 @@ exaSetAccelBlock(ExaScreenPrivPtr pExaScr, ExaPixmapPrivPtr pExaPixmap,
 void
 exaDoMigration (ExaMigrationPtr pixmaps, int npixmaps, Bool can_accel);
 
+Bool
+exaPixmapIsPinned (PixmapPtr pPix);
+
 extern const GCFuncs exaGCFuncs;
 
 /* exa_classic.c */
@@ -579,6 +582,28 @@ exaDestroyPixmap_driver (PixmapPtr pPixmap);
 Bool
 exaPixmapIsOffscreen_driver(PixmapPtr pPixmap);
 
+/* exa_mixed.c */
+PixmapPtr
+exaCreatePixmap_mixed(ScreenPtr pScreen, int w, int h, int depth,
+		unsigned usage_hint);
+
+Bool
+exaModifyPixmapHeader_mixed(PixmapPtr pPixmap, int width, int height, int depth,
+		      int bitsPerPixel, int devKind, pointer pPixData);
+
+Bool
+exaDestroyPixmap_mixed(PixmapPtr pPixmap);
+
+Bool
+exaPixmapIsOffscreen_mixed(PixmapPtr pPixmap);
+
+/* exa_migration_mixed.c */
+void
+exaCreateDriverPixmap_mixed(PixmapPtr pPixmap);
+
+void
+exaDoMigration_mixed(ExaMigrationPtr pixmaps, int npixmaps, Bool can_accel);
+
 /* exa_render.c */
 Bool
 exaOpReadsDestination (CARD8 op);
@@ -633,7 +658,7 @@ exaGlyphs (CARD8	op,
 	  GlyphListPtr	list,
 	  GlyphPtr	*glyphs);
 
-/* exa_migration.c */
+/* exa_migration_classic.c */
 void
 exaDoMigration_classic (ExaMigrationPtr pixmaps, int npixmaps, Bool can_accel);
 
diff --git a/exa/exa_render.c b/exa/exa_render.c
index 3c822d16b..1ac29f233 100644
--- a/exa/exa_render.c
+++ b/exa/exa_render.c
@@ -301,7 +301,7 @@ exaTryDriverSolidFill(PicturePtr	pSrc,
 
     pixel = exaGetPixmapFirstPixel (pSrcPix);
 
-    if (pDstExaPix->pDamage) {
+    if (pExaScr->do_migration) {
 	ExaMigrationRec pixmaps[1];
 
 	pixmaps[0].as_dst = TRUE;
@@ -395,8 +395,7 @@ exaTryDriverCompositeRects(CARD8	       op,
 	return -1;
     }
 
-    if (pSrcExaPix->pDamage || pDstExaPix->pDamage ||
-	(pMask && pMaskExaPix->pDamage)) {
+    if (pExaScr->do_migration) {
 	ExaMigrationRec pixmaps[3];
 
 	pixmaps[0].as_dst = TRUE;
@@ -507,8 +506,6 @@ exaCompositeRects(CARD8	              op,
 		  ExaCompositeRectPtr rects)
 {
     ExaScreenPriv (pDst->pDrawable->pScreen);
-    PixmapPtr pPixmap = exaGetDrawablePixmap(pDst->pDrawable);
-    ExaPixmapPriv(pPixmap);
     int n;
     ExaCompositeRectPtr r;
     int ret;
@@ -516,7 +513,7 @@ exaCompositeRects(CARD8	              op,
     /* If we get a mask, that means we're rendering to the exaGlyphs
      * destination directly, so the damage layer takes care of this.
      */
-    if (!pMask && pExaPixmap->pDamage) {
+    if (!pMask) {
 	RegionRec region;
 	int x1 = MAXSHORT;
 	int y1 = MAXSHORT;
@@ -610,7 +607,7 @@ exaCompositeRects(CARD8	              op,
     
     /************************************************************/
 
-    if (!pMask && pExaPixmap->pDamage) {
+    if (!pMask) {
 	/* Now we have to flush the damage out from pendingDamage => damage 
 	 * Calling DamageRegionProcessPending has that effect.
 	 */
@@ -689,8 +686,7 @@ exaTryDriverComposite(CARD8		op,
 
     REGION_TRANSLATE(pScreen, &region, dst_off_x, dst_off_y);
 
-    if (pSrcExaPix->pDamage || pDstExaPix->pDamage ||
-	(pMask && pMaskExaPix->pDamage)) {
+    if (pExaScr->do_migration) {
 	ExaMigrationRec pixmaps[3];
 
 	pixmaps[0].as_dst = TRUE;
@@ -707,9 +703,8 @@ exaTryDriverComposite(CARD8		op,
 	    pixmaps[2].pPix = pMaskPix;
 	    pixmaps[2].pReg = NULL;
 	    exaDoMigration(pixmaps, 3, TRUE);
-	} else {
+	} else
 	    exaDoMigration(pixmaps, 2, TRUE);
-	}
     }
 
     pSrcPix = exaGetOffscreenPixmap (pSrc->pDrawable, &src_off_x, &src_off_y);