From 85f46e0bcdf60d145a6868ee71d10688c9113e6e Mon Sep 17 00:00:00 2001
From: Eric Anholt <anholt@freebsd.org>
Date: Mon, 17 May 2004 07:14:23 +0000
Subject: [PATCH] Add new CheckComposite hook. This allows a driver to avoid
 the migration of     pixmaps for a Composite operation if the operation can't
 be supported.     This hook is optional.

---
 hw/kdrive/src/kaapict.c | 5 +++++
 hw/kdrive/src/kdrive.h  | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/hw/kdrive/src/kaapict.c b/hw/kdrive/src/kaapict.c
index cca0d466e..5c4696dec 100644
--- a/hw/kdrive/src/kaapict.c
+++ b/hw/kdrive/src/kaapict.c
@@ -426,6 +426,11 @@ kaaTryDriverComposite(CARD8		op,
 				   width, height))
 	return 1;
 
+    if (pKaaScr->info->CheckComposite &&
+	!(*pKaaScr->info->CheckComposite) (op, pSrc, pMask, pDst))
+    {
+	return -1;
+    }
 
     if (pSrc->pDrawable->type == DRAWABLE_PIXMAP)
 	kaaPixmapUseScreen ((PixmapPtr) pSrc->pDrawable);
diff --git a/hw/kdrive/src/kdrive.h b/hw/kdrive/src/kdrive.h
index 7981c7e54..8dc6606ef 100644
--- a/hw/kdrive/src/kdrive.h
+++ b/hw/kdrive/src/kdrive.h
@@ -348,6 +348,10 @@ typedef struct _KaaScreenInfo {
 			  int	height);
     void	(*DoneBlend) (void);
 
+    Bool        (*CheckComposite) (int		op,
+				   PicturePtr	pSrcPicture,
+				   PicturePtr	pMaskPicture,
+				   PicturePtr	pDstPicture);
     Bool        (*PrepareComposite) (int		op,
 				     PicturePtr		pSrcPicture,
 				     PicturePtr		pMaskPicture,