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<h1>csplugincommon/canvas/draw_common.h</h1><a href="draw__common_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment">    Copyright (C) 2004 by Jorrit Tyberghein</span>
<a name="l00003"></a>00003 <span class="comment">              (C) 2004 by Frank Richter</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">    This library is free software; you can redistribute it and/or</span>
<a name="l00006"></a>00006 <span class="comment">    modify it under the terms of the GNU Library General Public</span>
<a name="l00007"></a>00007 <span class="comment">    License as published by the Free Software Foundation; either</span>
<a name="l00008"></a>00008 <span class="comment">    version 2 of the License, or (at your option) any later version.</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment">    This library is distributed in the hope that it will be useful,</span>
<a name="l00011"></a>00011 <span class="comment">    but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00012"></a>00012 <span class="comment">    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU</span>
<a name="l00013"></a>00013 <span class="comment">    Library General Public License for more details.</span>
<a name="l00014"></a>00014 <span class="comment"></span>
<a name="l00015"></a>00015 <span class="comment">    You should have received a copy of the GNU Library General Public</span>
<a name="l00016"></a>00016 <span class="comment">    License along with this library; if not, write to the Free</span>
<a name="l00017"></a>00017 <span class="comment">    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.</span>
<a name="l00018"></a>00018 <span class="comment">*/</span>
<a name="l00019"></a>00019 
<a name="l00020"></a>00020 <span class="preprocessor">#ifndef __CS_CSPLUGINCOMMON_CANVAS_DRAW_COMMON_H__</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span><span class="preprocessor">#define __CS_CSPLUGINCOMMON_CANVAS_DRAW_COMMON_H__</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span>
<a name="l00027"></a>00027 <span class="preprocessor">#include "<a class="code" href="csplugincommon_2canvas_2graph2d_8h.html" title="Base class for 2D canvases.">csplugincommon/canvas/graph2d.h</a>"</span>
<a name="l00028"></a>00028 
<a name="l00033"></a>00033 
<a name="l00034"></a>00034 <span class="keyword">template</span>&lt;<span class="keyword">class</span> Tpixel&gt;
<a name="l00035"></a><a class="code" href="group__plugincommon.html#g40ff3488d7cc871d2646a3039cab5929">00035</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__plugincommon.html#g40ff3488d7cc871d2646a3039cab5929" title="Split a g2d color into the color and alpha part.">SplitAlpha</a> (<span class="keyword">const</span> <span class="keywordtype">int</span> color, Tpixel&amp; colorPart, <a class="code" href="group__util.html#gdde6aaee8457bee49c2a92621fe22b79" title="unsigned 8-bit integer (0..255)">uint8</a>&amp; alphaPart)
<a name="l00036"></a>00036 {
<a name="l00037"></a>00037   colorPart = color ^ 0xff000000;
<a name="l00038"></a>00038   alphaPart = 255 - (color &gt;&gt; 24);
<a name="l00039"></a>00039 }
<a name="l00040"></a>00040 
<a name="l00042"></a>00042 <span class="keyword">template</span>&lt;<span class="keyword">class</span> Tpixel&gt;
<a name="l00043"></a><a class="code" href="classcsPixMixerCopy.html">00043</a> <span class="keyword">class </span><a class="code" href="classcsPixMixerCopy.html" title="PixMixer that ignores alpha.">csPixMixerCopy</a>
<a name="l00044"></a>00044 {
<a name="l00045"></a>00045   Tpixel color;
<a name="l00046"></a>00046 <span class="keyword">public</span>:
<a name="l00047"></a><a class="code" href="classcsPixMixerCopy.html#f3f92f5fa37bd4e8c4cc93d54d1fc158">00047</a>   <a class="code" href="classcsPixMixerCopy.html#f3f92f5fa37bd4e8c4cc93d54d1fc158">csPixMixerCopy</a> (<a class="code" href="classcsGraphics2D.html" title="This is the base class for 2D canvases.">csGraphics2D</a>* <span class="comment">/*G2D*/</span>, Tpixel color, <a class="code" href="group__util.html#gdde6aaee8457bee49c2a92621fe22b79" title="unsigned 8-bit integer (0..255)">uint8</a> <span class="comment">/*alpha*/</span>)
<a name="l00048"></a>00048   {
<a name="l00049"></a>00049     csPixMixerCopy::color = color;
<a name="l00050"></a>00050   }
<a name="l00051"></a><a class="code" href="classcsPixMixerCopy.html#c21bdce6f55356aff2b5a0201e60481d">00051</a>   <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classcsPixMixerCopy.html#c21bdce6f55356aff2b5a0201e60481d">Mix</a> (Tpixel&amp; dest)
<a name="l00052"></a>00052   {
<a name="l00053"></a>00053     dest = color;
<a name="l00054"></a>00054   }
<a name="l00055"></a>00055 };
<a name="l00056"></a>00056 
<a name="l00058"></a>00058 <span class="keyword">template</span>&lt;<span class="keyword">class</span> Tpixel&gt;
<a name="l00059"></a><a class="code" href="classcsPixMixerRGBA.html">00059</a> <span class="keyword">class </span><a class="code" href="classcsPixMixerRGBA.html" title="PixMixer that mixes the pixel into the background with alpha.">csPixMixerRGBA</a>
<a name="l00060"></a>00060 {
<a name="l00061"></a>00061   <a class="code" href="group__util.html#g1134b580f8da4de94ca6b1de4d37975e" title="unsigned 32-bit integer (0..4 294 967 295)">uint32</a> rbMask, gaMask;
<a name="l00062"></a>00062   <span class="keywordtype">int</span> intAlphaInv;
<a name="l00063"></a>00063   <a class="code" href="group__util.html#g1134b580f8da4de94ca6b1de4d37975e" title="unsigned 32-bit integer (0..4 294 967 295)">uint32</a> intRB, intGA;
<a name="l00064"></a>00064   <span class="keywordtype">int</span> gShift, gShift2;
<a name="l00065"></a>00065   <span class="keywordtype">int</span> alphaPrec;
<a name="l00066"></a>00066 <span class="keyword">public</span>:
<a name="l00067"></a><a class="code" href="classcsPixMixerRGBA.html#8be8df1c2a19b7ccae58904301a2781f">00067</a>   <a class="code" href="classcsPixMixerRGBA.html#8be8df1c2a19b7ccae58904301a2781f">csPixMixerRGBA</a> (<a class="code" href="classcsGraphics2D.html" title="This is the base class for 2D canvases.">csGraphics2D</a>* G2D, Tpixel color, <a class="code" href="group__util.html#gdde6aaee8457bee49c2a92621fe22b79" title="unsigned 8-bit integer (0..255)">uint8</a> alpha)
<a name="l00068"></a>00068   {
<a name="l00069"></a>00069     alphaPrec = G2D-&gt;<a class="code" href="classcsGraphics2D.html#118dd580babe3a8416c1e7b89f6dfdfe" title="The pixel format.">pfmt</a>.<a class="code" href="structcsPixelFormat.html#4ac98dd68e5529a831a85e0af15f2202">GreenBits</a>;
<a name="l00070"></a>00070     <span class="keyword">const</span> <span class="keywordtype">int</span> alphaShift = 8 - alphaPrec;
<a name="l00071"></a>00071     <span class="keyword">const</span> <span class="keywordtype">int</span> intAlpha = (alpha + 1) &gt;&gt; alphaShift;
<a name="l00072"></a>00072     intAlphaInv = (255 - alpha + 1) &gt;&gt; alphaShift;
<a name="l00073"></a>00073     gShift = G2D-&gt;<a class="code" href="classcsGraphics2D.html#118dd580babe3a8416c1e7b89f6dfdfe" title="The pixel format.">pfmt</a>.<a class="code" href="structcsPixelFormat.html#38b92fd903f6010730e88a36fd60c0da">GreenShift</a>;
<a name="l00074"></a>00074     gShift2 = alphaPrec - gShift;
<a name="l00075"></a>00075     <span class="comment">// Makes the assumption that colors are laid out ARGB ...</span>
<a name="l00076"></a>00076     rbMask = G2D-&gt;<a class="code" href="classcsGraphics2D.html#118dd580babe3a8416c1e7b89f6dfdfe" title="The pixel format.">pfmt</a>.<a class="code" href="structcsPixelFormat.html#604edca9430a5d5b4e812baa49e7fbf1" title="The masks to extract the color information from a pixel (truecolor mode only).">RedMask</a> | G2D-&gt;<a class="code" href="classcsGraphics2D.html#118dd580babe3a8416c1e7b89f6dfdfe" title="The pixel format.">pfmt</a>.<a class="code" href="structcsPixelFormat.html#344c300262e89a13626c644d2ddb5865">BlueMask</a>;
<a name="l00077"></a>00077     intRB = ((color &amp; rbMask) * intAlpha) &gt;&gt; alphaPrec;
<a name="l00078"></a>00078     gaMask = G2D-&gt;<a class="code" href="classcsGraphics2D.html#118dd580babe3a8416c1e7b89f6dfdfe" title="The pixel format.">pfmt</a>.<a class="code" href="structcsPixelFormat.html#f15b67458e85bdf86cf2c2aa6a2c298c">GreenMask</a> | G2D-&gt;<a class="code" href="classcsGraphics2D.html#118dd580babe3a8416c1e7b89f6dfdfe" title="The pixel format.">pfmt</a>.<a class="code" href="structcsPixelFormat.html#7bc610c1f073b232fe4ae22f6696baa2">AlphaMask</a>;
<a name="l00079"></a>00079     intGA = (((color &amp; gaMask) &gt;&gt; gShift) * intAlpha) &gt;&gt; gShift2;
<a name="l00080"></a>00080   }
<a name="l00081"></a><a class="code" href="classcsPixMixerRGBA.html#eb2e69b4c72efb0f87624a42515f297c">00081</a>   <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classcsPixMixerRGBA.html#eb2e69b4c72efb0f87624a42515f297c">Mix</a> (Tpixel&amp; dest)<span class="keyword"> const</span>
<a name="l00082"></a>00082 <span class="keyword">  </span>{
<a name="l00083"></a>00083     <span class="keyword">const</span> Tpixel destCol = dest;
<a name="l00084"></a>00084     <span class="keyword">const</span> Tpixel newRB = 
<a name="l00085"></a>00085       ((intRB + (((destCol &amp; rbMask) * intAlphaInv) &gt;&gt; alphaPrec)) &amp; rbMask);
<a name="l00086"></a>00086     <span class="keyword">const</span> Tpixel newGA = 
<a name="l00087"></a>00087       ((intGA + (((((destCol &amp; gaMask) &gt;&gt; gShift) * intAlphaInv)) &gt;&gt; gShift2)) 
<a name="l00088"></a>00088         &amp; gaMask);
<a name="l00089"></a>00089     dest = newRB | newGA;
<a name="l00090"></a>00090   }
<a name="l00091"></a>00091 };
<a name="l00092"></a>00092 
<a name="l00094"></a>00094 <span class="keyword">template</span>&lt;<span class="keyword">class</span> Tpixel&gt;
<a name="l00095"></a><a class="code" href="classcsPixMixerNoop.html">00095</a> <span class="keyword">class </span><a class="code" href="classcsPixMixerNoop.html" title="PixMixer that doesn&amp;#39;t do anything.">csPixMixerNoop</a>
<a name="l00096"></a>00096 {
<a name="l00097"></a>00097 <span class="keyword">public</span>:
<a name="l00098"></a><a class="code" href="classcsPixMixerNoop.html#7318d7318418ce3204571d7debbf5ceb">00098</a>   <a class="code" href="classcsPixMixerNoop.html#7318d7318418ce3204571d7debbf5ceb">csPixMixerNoop</a> (<a class="code" href="classcsGraphics2D.html" title="This is the base class for 2D canvases.">csGraphics2D</a>* <span class="comment">/*G2D*/</span>, Tpixel <span class="comment">/*color*/</span>, <a class="code" href="group__util.html#gdde6aaee8457bee49c2a92621fe22b79" title="unsigned 8-bit integer (0..255)">uint8</a> <span class="comment">/*alpha*/</span>)
<a name="l00099"></a>00099   { }
<a name="l00100"></a><a class="code" href="classcsPixMixerNoop.html#91b848c447a155423c16e3d00ef39e0f">00100</a>   <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classcsPixMixerNoop.html#91b848c447a155423c16e3d00ef39e0f">Mix</a> (Tpixel&amp; <span class="comment">/*dest*/</span>)
<a name="l00101"></a>00101   { }
<a name="l00102"></a>00102 };
<a name="l00103"></a>00103 
<a name="l00106"></a>00106 <span class="preprocessor">#endif // __CS_CSPLUGINCOMMON_CANVAS_DRAW_COMMON_H__</span>
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