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nsX11AlphaBlend.h
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is Netscape.com code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 2001
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Brian Stell <bstell@netscape.com>
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either of the GNU General Public License Version 2 or later (the "GPL"),
00027  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
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00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #ifndef nsX11AlphaBlend_h__
00040 #define nsX11AlphaBlend_h__
00041 
00042 #include <X11/Xlib.h>
00043 #include "nsColor.h"
00044 
00045 class nsAntiAliasedGlyph;
00046 
00047 #ifdef DEBUG
00048 #ifndef DEBUG_SHOW_GLYPH_BOX
00049 # define DEBUG_SHOW_GLYPH_BOX 0
00050 #endif
00051 void AADrawBox(XImage *, PRInt32, PRInt32, PRInt32, PRInt32, nscolor, PRUint8);
00052 #if DEBUG_SHOW_GLYPH_BOX
00053 # define DEBUG_AADRAWBOX(i,x,y,w,h,r,g,b,a) \
00054     PR_BEGIN_MACRO \
00055       nscolor color NS_RGB((r),(g),(b)); \
00056       AADrawBox((i), (x), (y), (w), (h), color, (a)); \
00057     PR_END_MACRO
00058 #else
00059 # define DEBUG_AADRAWBOX(i,x,y,w,h,r,g,b,a)
00060 #endif
00061 #endif
00062 
00063 void     nsX11AlphaBlendFreeGlobals(void);
00064 nsresult nsX11AlphaBlendInitGlobals(Display *dsp);
00065 
00066 
00067 typedef void    (*blendGlyph)(XImage *, nsAntiAliasedGlyph *, PRUint8*,
00068                               nscolor, int, int);
00069 typedef void    (*blendPixel)(XImage *, int, int, nscolor, int);
00070 typedef nscolor (*pixelToNSColor)(unsigned long aPixel);
00071 
00073 //
00074 // class nsX11AlphaBlend class definition
00075 //
00077 class nsX11AlphaBlend {
00078 public:
00079   inline static PRBool     CanAntiAlias()      { return sAvailable; };
00080   inline static blendPixel GetBlendPixel()     { return sBlendPixel; };
00081   inline static blendGlyph GetBlendGlyph()     { return sBlendMonoImage; };
00082 
00083   static XImage*  GetXImage(PRUint32 width, PRUint32 height);
00084   static void     FreeGlobals();
00085   static nsresult InitGlobals(Display *dsp);
00086   static XImage*  GetBackground(Display *, int, Drawable,
00087                                 PRInt32, PRInt32, PRUint32, PRUint32);
00088   static nscolor  PixelToNSColor(unsigned long aPixel);
00089 
00090 protected:
00091   static void ClearGlobals();
00092   static void ClearFunctions();
00093   static PRBool InitLibrary(Display *dsp);
00094 
00095   static PRBool         sAvailable;
00096   static PRUint16       sBitmapPad;
00097   static PRUint16       sBitsPerPixel;
00098   static blendGlyph     sBlendMonoImage;
00099   static blendPixel     sBlendPixel;
00100   static PRUint16       sBytesPerPixel;
00101   static int            sDepth;
00102   static PRBool         sInited;
00103   static pixelToNSColor sPixelToNSColor;
00104 };
00105 
00106 #endif /* nsX11AlphaBlend_h__ */