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<div class="title">sdlblendingfunctions.cpp</div> </div>
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<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) 2005-2008 by the FIFE team *</span>
<a name="l00003"></a>00003 <span class="comment"> * http://www.fifengine.de *</span>
<a name="l00004"></a>00004 <span class="comment"> * This file is part of FIFE. *</span>
<a name="l00005"></a>00005 <span class="comment"> * *</span>
<a name="l00006"></a>00006 <span class="comment"> * FIFE is free software; you can redistribute it and/or *</span>
<a name="l00007"></a>00007 <span class="comment"> * modify it under the terms of the GNU Lesser General Public *</span>
<a name="l00008"></a>00008 <span class="comment"> * License as published by the Free Software Foundation; either *</span>
<a name="l00009"></a>00009 <span class="comment"> * version 2.1 of the License, or (at your option) any later version. *</span>
<a name="l00010"></a>00010 <span class="comment"> * *</span>
<a name="l00011"></a>00011 <span class="comment"> * This library is distributed in the hope that it will be useful, *</span>
<a name="l00012"></a>00012 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of *</span>
<a name="l00013"></a>00013 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *</span>
<a name="l00014"></a>00014 <span class="comment"> * Lesser General Public License for more details. *</span>
<a name="l00015"></a>00015 <span class="comment"> * *</span>
<a name="l00016"></a>00016 <span class="comment"> * You should have received a copy of the GNU Lesser General Public *</span>
<a name="l00017"></a>00017 <span class="comment"> * License along with this library; if not, write to the *</span>
<a name="l00018"></a>00018 <span class="comment"> * Free Software Foundation, Inc., *</span>
<a name="l00019"></a>00019 <span class="comment"> * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *</span>
<a name="l00020"></a>00020 <span class="comment"> ***************************************************************************/</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="comment">// Standard C++ library includes</span>
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="comment">// 3rd party library includes</span>
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="comment">// FIFE includes</span>
<a name="l00027"></a>00027 <span class="comment">// These includes are split up in two parts, separated by one empty line</span>
<a name="l00028"></a>00028 <span class="comment">// First block: files included from the FIFE root src directory</span>
<a name="l00029"></a>00029 <span class="comment">// Second block: files included from the same folder</span>
<a name="l00030"></a>00030 <span class="preprocessor">#include "sdlblendingfunctions.h"</span>
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="keyword">namespace </span>FIFE {
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="keyword">struct </span>ColorRGB8 {
<a name="l00035"></a>00035 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> r, g, b;
<a name="l00036"></a>00036 };
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="keyword">struct </span>ColorRGBA8 {
<a name="l00039"></a>00039 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> r, g, b, a;
<a name="l00040"></a>00040 };
<a name="l00041"></a>00041
<a name="l00042"></a><a class="code" href="namespace_f_i_f_e.html#aa908327fc69912ecd09e830b24e2aadf">00042</a> <span class="keywordtype">void</span> <a class="code" href="namespace_f_i_f_e.html#aa908327fc69912ecd09e830b24e2aadf">SDL_BlendRow_RGBA8_to_RGBA8</a>( <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>* src, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>* dst, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> alpha, <span class="keywordtype">int</span> n ) {
<a name="l00043"></a>00043 <span class="keyword">const</span> ColorRGBA8* srcColor = <span class="keyword">reinterpret_cast<</span> <span class="keyword">const </span>ColorRGBA8* <span class="keyword">></span>( src );
<a name="l00044"></a>00044 ColorRGBA8* dstColor = <span class="keyword">reinterpret_cast<</span> ColorRGBA8* <span class="keyword">></span>( dst );
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="keywordflow">for</span>( <span class="keywordtype">int</span> i = n; 0 < i; --i ) {
<a name="l00047"></a>00047 <span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> aMulA = alpha * srcColor->a;
<a name="l00048"></a>00048
<a name="l00049"></a>00049 <span class="keywordflow">if</span>( aMulA ) {
<a name="l00050"></a>00050 <span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> OneMin_aMulA = 65535 - aMulA;
<a name="l00051"></a>00051 dstColor->r = ( aMulA * srcColor->r + OneMin_aMulA * dstColor->r ) >> 16;
<a name="l00052"></a>00052 dstColor->g = ( aMulA * srcColor->g + OneMin_aMulA * dstColor->g ) >> 16;
<a name="l00053"></a>00053 dstColor->b = ( aMulA * srcColor->b + OneMin_aMulA * dstColor->b ) >> 16;
<a name="l00054"></a>00054 dstColor->a = 255;
<a name="l00055"></a>00055 }
<a name="l00056"></a>00056 ++dstColor;
<a name="l00057"></a>00057 ++srcColor;
<a name="l00058"></a>00058 }
<a name="l00059"></a>00059 }
<a name="l00060"></a>00060
<a name="l00061"></a><a class="code" href="namespace_f_i_f_e.html#a3c507d7326dc83a40e23d19ed77b5bc2">00061</a> <span class="keywordtype">void</span> <a class="code" href="namespace_f_i_f_e.html#a3c507d7326dc83a40e23d19ed77b5bc2">SDL_BlendRow_RGBA8_to_RGB8</a>( <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>* src, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>* dst, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> alpha, <span class="keywordtype">int</span> n ) {
<a name="l00062"></a>00062 <span class="keyword">const</span> ColorRGBA8* srcColor = <span class="keyword">reinterpret_cast<</span> <span class="keyword">const </span>ColorRGBA8* <span class="keyword">></span>( src );
<a name="l00063"></a>00063 ColorRGB8* dstColor = <span class="keyword">reinterpret_cast<</span> ColorRGB8* <span class="keyword">></span>( dst );
<a name="l00064"></a>00064
<a name="l00065"></a>00065 <span class="keywordflow">for</span>( <span class="keywordtype">int</span> i = n; 0 < i; --i ) {
<a name="l00066"></a>00066 <span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> aMulA = alpha * srcColor->a;
<a name="l00067"></a>00067 <span class="keywordflow">if</span>( aMulA ) {
<a name="l00068"></a>00068 <span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> OneMin_aMulA = 65535 - aMulA;
<a name="l00069"></a>00069 dstColor->r = ( aMulA * srcColor->r + OneMin_aMulA * dstColor->r ) >> 16;
<a name="l00070"></a>00070 dstColor->g = ( aMulA * srcColor->g + OneMin_aMulA * dstColor->g ) >> 16;
<a name="l00071"></a>00071 dstColor->b = ( aMulA * srcColor->b + OneMin_aMulA * dstColor->b ) >> 16;
<a name="l00072"></a>00072 }
<a name="l00073"></a>00073
<a name="l00074"></a>00074 ++dstColor;
<a name="l00075"></a>00075 ++srcColor;
<a name="l00076"></a>00076 }
<a name="l00077"></a>00077 }
<a name="l00078"></a>00078
<a name="l00079"></a><a class="code" href="namespace_f_i_f_e.html#a2579a9c749d02396470a7119cb8d6b8c">00079</a> <span class="keywordtype">void</span> <a class="code" href="namespace_f_i_f_e.html#a2579a9c749d02396470a7119cb8d6b8c">SDL_BlendRow_RGBA8_to_RGB565</a>( <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>* src, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>* dst, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> alpha, <span class="keywordtype">int</span> n ) {
<a name="l00080"></a>00080 <span class="keyword">const</span> ColorRGBA8* srcColor = <span class="keyword">reinterpret_cast<</span> <span class="keyword">const </span>ColorRGBA8* <span class="keyword">></span>( src );
<a name="l00081"></a>00081 <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span>* dstColor = <span class="keyword">reinterpret_cast<</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span>* <span class="keyword">></span>( dst );
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="keywordflow">for</span>( <span class="keywordtype">int</span> i = n; 0 < i; --i ) {
<a name="l00084"></a>00084 <span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> aMulA = ( alpha * srcColor->a ) >> 8;
<a name="l00085"></a>00085 <span class="keywordflow">if</span>( aMulA ) {
<a name="l00086"></a>00086 <span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> OneMin_aMulA = 255 - aMulA;
<a name="l00087"></a>00087 <span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> c = *dstColor;
<a name="l00088"></a>00088 *dstColor = ( ( ( srcColor->b * aMulA ) +
<a name="l00089"></a>00089 ( ( ( c & 0xF800 ) >> 8 ) * OneMin_aMulA ) ) & 0xF800 ) |
<a name="l00090"></a>00090 ( ( ( ( srcColor->g * aMulA ) +
<a name="l00091"></a>00091 ( ( ( c & 0x07E0 ) >> 3 ) * OneMin_aMulA ) ) >> 5 ) & 0x07E0 ) |
<a name="l00092"></a>00092 ( ( ( ( srcColor->r * aMulA ) +
<a name="l00093"></a>00093 ( ( ( c & 0x001F ) << 3 ) * OneMin_aMulA ) ) >> 11 ) & 0x001F );
<a name="l00094"></a>00094 }
<a name="l00095"></a>00095
<a name="l00096"></a>00096 ++dstColor;
<a name="l00097"></a>00097 ++srcColor;
<a name="l00098"></a>00098 }
<a name="l00099"></a>00099 }
<a name="l00100"></a>00100
<a name="l00101"></a>00101
<a name="l00102"></a><a class="code" href="namespace_f_i_f_e.html#aca0c153dd3fac6b19d24e693f7781f53">00102</a> <span class="keywordtype">void</span> <a class="code" href="namespace_f_i_f_e.html#aca0c153dd3fac6b19d24e693f7781f53">SDL_BlendRow_RGBA4_to_RGB565</a>( <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>* src, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>* dst, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> alpha, <span class="keywordtype">int</span> n ) {
<a name="l00103"></a>00103 <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span>* srcColor = <span class="keyword">reinterpret_cast<</span> <span class="keyword">const </span><span class="keywordtype">unsigned</span> <span class="keywordtype">short</span>* <span class="keyword">></span>( src );
<a name="l00104"></a>00104 <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span>* dstColor = <span class="keyword">reinterpret_cast<</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span>* <span class="keyword">></span>( dst );
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="keywordflow">for</span>( <span class="keywordtype">int</span> i = n; 0 < i; --i ) {
<a name="l00107"></a>00107 <span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> c1 = *dstColor;
<a name="l00108"></a>00108 <span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> c2 = *srcColor;
<a name="l00109"></a>00109
<a name="l00110"></a>00110 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> aMulA = c2 & 0xF;
<a name="l00111"></a>00111 aMulA = ( alpha * aMulA ) / 15;
<a name="l00112"></a>00112 <span class="keywordflow">if</span>( aMulA ) {
<a name="l00113"></a>00113 <span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> OneMin_aMulA = 255 - aMulA;
<a name="l00114"></a>00114 <span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> result;
<a name="l00115"></a>00115 result = ( ( ( ( c2 & 0xF000 ) | 0x0800 ) * aMulA ) + ( ( c1 & 0xF800 ) * OneMin_aMulA ) ) & 0xF80000;
<a name="l00116"></a>00116 result |= ( ( ( ( ( c2 & 0x0F00 ) >> 1 ) | 0x0040 ) * aMulA ) + ( ( c1 & 0x07E0 ) * OneMin_aMulA ) ) & 0x07E000;
<a name="l00117"></a>00117 result |= ( ( ( ( ( c2 & 0x00F0 ) >> 3 ) | 0x0001 ) * aMulA ) + ( ( c1 & 0x001F ) * OneMin_aMulA ) ) & 0x001F00;
<a name="l00119"></a>00119 *dstColor = <span class="keyword">static_cast<</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> <span class="keywordtype">int</span> <span class="keyword">></span>( result >> 8 );
<a name="l00120"></a>00120 }
<a name="l00121"></a>00121
<a name="l00122"></a>00122 ++dstColor;
<a name="l00123"></a>00123 ++srcColor;
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125 }
<a name="l00126"></a>00126
<a name="l00127"></a>00127 }
</pre></div></div>
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