bug 107018, alpha blending routines for anti-aliased scaled X bitmap fonts

(part of bug 90813), r=pavlov, sr=waterson

gfx/src/gtk/nsX11AlphaBlend.h

@@ -0,0 +1,93 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: NPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Netscape.com code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2001
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Brian Stell <bstell@netscape.com>
+ *
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the NPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the NPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef nsX11AlphaBlend_h__
+#define nsX11AlphaBlend_h__
+
+#include "X11/Xlib.h"
+#include "nsColor.h"
+
+class nsAntiAliasedGlyph;
+
+void AADrawBox(XImage *, PRInt32, PRInt32, PRInt32, PRInt32, nscolor, PRUint8);
+
+void     nsX11AlphaBlendFreeGlobals(void);
+nsresult nsX11AlphaBlendInitGlobals(Display *dsp);
+
+
+typedef void    (*blendGlyph)(XImage *, nsAntiAliasedGlyph *, PRUint8*,
+                              nscolor, int, int);
+typedef void    (*blendPixel)(XImage *, int, int, nscolor, int);
+typedef nscolor (*pixelToNSColor)(unsigned long aPixel);
+
+///////////////////////////////////////////////////////////////////////
+//
+// class nsX11AlphaBlend class definition
+//
+///////////////////////////////////////////////////////////////////////
+class nsX11AlphaBlend {
+public:
+  inline static PRBool     CanAntiAlias()      { return sAvailable; };
+  inline static blendPixel GetBlendPixel()     { return sBlendPixel; };
+  inline static blendGlyph GetBlendGlyph()     { return sBlendMonoImage; };
+
+  static XImage*  GetXImage(PRUint32 width, PRUint32 height);
+  static void     FreeGlobals();
+  static nsresult InitGlobals(Display *dsp);
+  static XImage*  GetBackground(Display *, int, Drawable,
+                                PRInt32, PRInt32, PRUint32, PRUint32);
+  static nscolor  PixelToNSColor(unsigned long aPixel);
+
+protected:
+  static void ClearGlobals();
+  static void ClearFunctions();
+  static PRBool InitLibrary(Display *dsp);
+
+  static PRBool         sAvailable;
+  static PRUint16       sBitmapPad;
+  static PRUint16       sBitsPerPixel;
+  static blendGlyph     sBlendMonoImage;
+  static blendPixel     sBlendPixel;
+  static PRUint16       sBytesPerPixel;
+  static int            sDepth;
+  static PRBool         sInited;
+  static pixelToNSColor sPixelToNSColor;
+};
+
+#endif /* nsX11AlphaBlend_h__ */