From 93d65fa6f93f905d1494e5aac73d41b57661b066 Mon Sep 17 00:00:00 2001
From: Fred Kiefer <fredkiefer@gmx.de>
Date: Fri, 17 Sep 2004 17:52:28 +0000
Subject: [PATCH] Disable use of AlphaBlend for windows backend.

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/back/trunk@20080 72102866-910b-0410-8b05-ffd578937521
---
 ChangeLog                   |  5 +++++
 Source/winlib/WIN32GState.m | 10 ++++++++++
 2 files changed, 15 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index b880bae..ba4e47f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2004-09-17  Fred Kiefer <FredKiefer@gmx.de>
+
+	* Source/winlib/Win32GState.m (-_compositeGState:...fraction:):
+	Made the use of AlphaBlend depend on a define, which by default is missing.
+
 2004-09-09  Fred Kiefer <FredKiefer@gmx.de>
 
 	* Tools/xpbs.m (-[XPbOwner getSelectionData:type:], -[XPbOwner
diff --git a/Source/winlib/WIN32GState.m b/Source/winlib/WIN32GState.m
index 4895a09..424edf2 100644
--- a/Source/winlib/WIN32GState.m
+++ b/Source/winlib/WIN32GState.m
@@ -28,8 +28,13 @@
 #include <AppKit/NSFont.h>
 #include <AppKit/NSGraphics.h>
 
+// Currently the use of alpha blending is switched off by default.
+//#define USE_ALPHABLEND
+
 // Define this so we pick up AlphaBlend, when loading windows.h
+#ifdef USE_ALPHABLEND
 #define WINVER 0x0500
+#endif
 #include "winlib/WIN32GState.h"
 #include "winlib/WIN32Context.h"
 #include "winlib/WIN32FontInfo.h"
@@ -46,6 +51,7 @@
 // before and after a bezier path forming an oblique
 // angle. The solution is to insert extra MoveToEx()'s
 // before and after the PolyBezierTo().
+// FK: I switched this off, as I think the treatment is worse than the illness.
 #define GDI_WIDELINE_BEZIERPATH_BUG 0
 
 static inline
@@ -230,6 +236,7 @@ RECT GSViewRectToWin(WIN32GState *s, NSRect r)
     {
     case NSCompositeSourceOver:
       {
+#ifdef USE_ALPHABLEND
 	// Use (0..1) fraction to set a (0..255) alpha constant value
 	BYTE SourceCosntantAlpha = (BYTE)(delta * 255);
 	BLENDFUNCTION blendFunc = {AC_SRC_OVER, 0, SourceCosntantAlpha, AC_SRC_ALPHA};
@@ -239,6 +246,7 @@ RECT GSViewRectToWin(WIN32GState *s, NSRect r)
 			     rectFrom.left, rectFrom.top,
 			     (rectFrom.right - rectFrom.left), h, blendFunc);
 	break;
+#endif
       }
 
     default:
@@ -474,6 +482,7 @@ HBITMAP GSCreateBitmap(HDC hDC, int pixelsWide, int pixelsHigh,
   int h;
   int y1;
 
+/*
   NSDebugLLog(@"WIN32GState", @"DPSImage : pixelsWide = %d : pixelsHigh = %d"
 	      ": bitsPerSample = %d : samplesPerPixel = %d"
 	      ": bitsPerPixel = %d : bytesPerRow = %d "
@@ -483,6 +492,7 @@ HBITMAP GSCreateBitmap(HDC hDC, int pixelsWide, int pixelsHigh,
 	      bitsPerSample, samplesPerPixel,
 	      bitsPerPixel, bytesPerRow,
 	      isPlanar, hasAlpha, colorSpaceName);
+*/
 
   if (window == NULL)
     {