From bc272f3edd079d2c9883c8ac34ed842d0d3dfe0f Mon Sep 17 00:00:00 2001
From: Magnus Olsen <magnus@greatlord.com>
Date: Wed, 8 Aug 2007 23:03:46 +0000
Subject: [PATCH] Implement NtGdiEngAlphaBlend Implement EngAlphaBlend

svn path=/trunk/; revision=28251
---
 reactos/dll/win32/gdi32/gdi32.def            |  2 +-
 reactos/dll/win32/gdi32/misc/stubs.c         | 10 -------
 reactos/subsystems/win32/win32k/eng/bitblt.c | 31 ++++++++++++++++++++
 reactos/subsystems/win32/win32k/w32ksvc.db   |  2 +-
 4 files changed, 33 insertions(+), 12 deletions(-)

diff --git a/reactos/dll/win32/gdi32/gdi32.def b/reactos/dll/win32/gdi32/gdi32.def
index 0b31ee02d34..68aebe712ab 100644
--- a/reactos/dll/win32/gdi32/gdi32.def
+++ b/reactos/dll/win32/gdi32/gdi32.def
@@ -162,7 +162,7 @@ EndFormPage@4
 EndPage@4
 EndPath@4
 EngAcquireSemaphore@4
-EngAlphaBlend@28
+EngAlphaBlend@28=NtGdiEngAlphaBlend@28;
 EngAssociateSurface@12
 EngBitBlt@44
 EngCheckAbort@4
diff --git a/reactos/dll/win32/gdi32/misc/stubs.c b/reactos/dll/win32/gdi32/misc/stubs.c
index fbe553494e1..586bd82dde6 100644
--- a/reactos/dll/win32/gdi32/misc/stubs.c
+++ b/reactos/dll/win32/gdi32/misc/stubs.c
@@ -2534,16 +2534,6 @@ EngAcquireSemaphore ( IN HSEMAPHORE hsem )
 	SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
 }
 
-/*
- * @unimplemented
- */
-BOOL STDCALL 
-EngAlphaBlend(SURFOBJ *psoDest,SURFOBJ *psoSrc,CLIPOBJ *pco,XLATEOBJ *pxlo,RECTL *prclDest,RECTL *prclSrc,BLENDOBJ *pBlendObj)
-{
-	UNIMPLEMENTED;
-	SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
-	return 0;
-}
 
 /*
  * @unimplemented
diff --git a/reactos/subsystems/win32/win32k/eng/bitblt.c b/reactos/subsystems/win32/win32k/eng/bitblt.c
index efdf51d4bc1..6e18f4d3565 100644
--- a/reactos/subsystems/win32/win32k/eng/bitblt.c
+++ b/reactos/subsystems/win32/win32k/eng/bitblt.c
@@ -892,6 +892,37 @@ IntEngStretchBlt(SURFOBJ *DestSurf,
     return ret;
 }
 
+
+BOOL
+STDCALL
+NtGdiEngAlphaBlend(IN SURFOBJ *Dest,
+                   IN SURFOBJ *Source,
+                   IN CLIPOBJ *ClipRegion,
+                   IN XLATEOBJ *ColorTranslation,
+                   IN PRECTL upDestRect,
+                   IN PRECTL upSourceRect,
+                   IN BLENDOBJ *BlendObj)
+{
+    RECTL DestRect;
+    RECTL SourceRect;
+
+    _SEH_TRY
+    {
+        ProbeForRead(upDestRect, sizeof(RECTL), 1);
+        RtlCopyMemory(&DestRect,upDestRect, sizeof(RECTL));
+        ProbeForRead(upSourceRect, sizeof(RECTL), 1);
+        RtlCopyMemory(&Source, upSourceRect, sizeof(RECTL));
+
+    }
+    _SEH_HANDLE
+    {
+        _SEH_YIELD(return FALSE);
+    }
+    _SEH_END;
+
+    return EngAlphaBlend(Dest, Source, ClipRegion, ColorTranslation, &DestRect, &SourceRect, BlendObj);
+}
+
 BOOL
 STDCALL
 EngAlphaBlend(IN SURFOBJ *Dest,
diff --git a/reactos/subsystems/win32/win32k/w32ksvc.db b/reactos/subsystems/win32/win32k/w32ksvc.db
index 88bd0000fed..e283e5f1f35 100644
--- a/reactos/subsystems/win32/win32k/w32ksvc.db
+++ b/reactos/subsystems/win32/win32k/w32ksvc.db
@@ -626,7 +626,7 @@ NtUserYieldTask                                  0
 # NtGdiEngStrokeAndFillPath                       10
 # NtGdiEngPaint                                    5
 # NtGdiEngLineTo                                   9
-# NtGdiEngAlphaBlend                               7
+NtGdiEngAlphaBlend                               7
 # NtGdiEngGradientFill                            10
 # NtGdiEngTransparentBlt                           8
 # NtGdiEngTextOut                                 10