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<div class="title">C:/Users/Andreas Schiffler/Desktop/Sources/sdlgfx/SDL_gfxBlitFunc.c</div> </div>
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<a href="_s_d_l__gfx_blit_func_8c.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"></span>
<a name="l00003"></a>00003 <span class="comment">SDL_gfxBlitFunc.c: custom blitters</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">Copyright (C) 2001-2012 Andreas Schiffler</span>
<a name="l00006"></a>00006 <span class="comment"></span>
<a name="l00007"></a>00007 <span class="comment">This software is provided 'as-is', without any express or implied</span>
<a name="l00008"></a>00008 <span class="comment">warranty. In no event will the authors be held liable for any damages</span>
<a name="l00009"></a>00009 <span class="comment">arising from the use of this software.</span>
<a name="l00010"></a>00010 <span class="comment"></span>
<a name="l00011"></a>00011 <span class="comment">Permission is granted to anyone to use this software for any purpose,</span>
<a name="l00012"></a>00012 <span class="comment">including commercial applications, and to alter it and redistribute it</span>
<a name="l00013"></a>00013 <span class="comment">freely, subject to the following restrictions:</span>
<a name="l00014"></a>00014 <span class="comment"></span>
<a name="l00015"></a>00015 <span class="comment">1. The origin of this software must not be misrepresented; you must not</span>
<a name="l00016"></a>00016 <span class="comment">claim that you wrote the original software. If you use this software</span>
<a name="l00017"></a>00017 <span class="comment">in a product, an acknowledgment in the product documentation would be</span>
<a name="l00018"></a>00018 <span class="comment">appreciated but is not required.</span>
<a name="l00019"></a>00019 <span class="comment"></span>
<a name="l00020"></a>00020 <span class="comment">2. Altered source versions must be plainly marked as such, and must not be</span>
<a name="l00021"></a>00021 <span class="comment">misrepresented as being the original software.</span>
<a name="l00022"></a>00022 <span class="comment"></span>
<a name="l00023"></a>00023 <span class="comment">3. This notice may not be removed or altered from any source</span>
<a name="l00024"></a>00024 <span class="comment">distribution.</span>
<a name="l00025"></a>00025 <span class="comment"></span>
<a name="l00026"></a>00026 <span class="comment">Andreas Schiffler -- aschiffler at ferzkopp dot net</span>
<a name="l00027"></a>00027 <span class="comment"></span>
<a name="l00028"></a>00028 <span class="comment">*/</span>
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="preprocessor">#include "<a class="code" href="_s_d_l__gfx_blit_func_8h.html">SDL_gfxBlitFunc.h</a>"</span>
<a name="l00031"></a>00031
<a name="l00039"></a><a class="code" href="_s_d_l__gfx_blit_func_8h.html#a6d0c17342154e14322a281603960691a">00039</a> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="_s_d_l__gfx_blit_func_8c.html#a6d0c17342154e14322a281603960691a" title="Alpha adjustment table for custom blitter.">GFX_ALPHA_ADJUST_ARRAY</a>[256] = {
<a name="l00040"></a>00040 0, <span class="comment">/* 0 */</span>
<a name="l00041"></a>00041 15, <span class="comment">/* 1 */</span>
<a name="l00042"></a>00042 22, <span class="comment">/* 2 */</span>
<a name="l00043"></a>00043 27, <span class="comment">/* 3 */</span>
<a name="l00044"></a>00044 31, <span class="comment">/* 4 */</span>
<a name="l00045"></a>00045 35, <span class="comment">/* 5 */</span>
<a name="l00046"></a>00046 39, <span class="comment">/* 6 */</span>
<a name="l00047"></a>00047 42, <span class="comment">/* 7 */</span>
<a name="l00048"></a>00048 45, <span class="comment">/* 8 */</span>
<a name="l00049"></a>00049 47, <span class="comment">/* 9 */</span>
<a name="l00050"></a>00050 50, <span class="comment">/* 10 */</span>
<a name="l00051"></a>00051 52, <span class="comment">/* 11 */</span>
<a name="l00052"></a>00052 55, <span class="comment">/* 12 */</span>
<a name="l00053"></a>00053 57, <span class="comment">/* 13 */</span>
<a name="l00054"></a>00054 59, <span class="comment">/* 14 */</span>
<a name="l00055"></a>00055 61, <span class="comment">/* 15 */</span>
<a name="l00056"></a>00056 63, <span class="comment">/* 16 */</span>
<a name="l00057"></a>00057 65, <span class="comment">/* 17 */</span>
<a name="l00058"></a>00058 67, <span class="comment">/* 18 */</span>
<a name="l00059"></a>00059 69, <span class="comment">/* 19 */</span>
<a name="l00060"></a>00060 71, <span class="comment">/* 20 */</span>
<a name="l00061"></a>00061 73, <span class="comment">/* 21 */</span>
<a name="l00062"></a>00062 74, <span class="comment">/* 22 */</span>
<a name="l00063"></a>00063 76, <span class="comment">/* 23 */</span>
<a name="l00064"></a>00064 78, <span class="comment">/* 24 */</span>
<a name="l00065"></a>00065 79, <span class="comment">/* 25 */</span>
<a name="l00066"></a>00066 81, <span class="comment">/* 26 */</span>
<a name="l00067"></a>00067 82, <span class="comment">/* 27 */</span>
<a name="l00068"></a>00068 84, <span class="comment">/* 28 */</span>
<a name="l00069"></a>00069 85, <span class="comment">/* 29 */</span>
<a name="l00070"></a>00070 87, <span class="comment">/* 30 */</span>
<a name="l00071"></a>00071 88, <span class="comment">/* 31 */</span>
<a name="l00072"></a>00072 90, <span class="comment">/* 32 */</span>
<a name="l00073"></a>00073 91, <span class="comment">/* 33 */</span>
<a name="l00074"></a>00074 93, <span class="comment">/* 34 */</span>
<a name="l00075"></a>00075 94, <span class="comment">/* 35 */</span>
<a name="l00076"></a>00076 95, <span class="comment">/* 36 */</span>
<a name="l00077"></a>00077 97, <span class="comment">/* 37 */</span>
<a name="l00078"></a>00078 98, <span class="comment">/* 38 */</span>
<a name="l00079"></a>00079 99, <span class="comment">/* 39 */</span>
<a name="l00080"></a>00080 100, <span class="comment">/* 40 */</span>
<a name="l00081"></a>00081 102, <span class="comment">/* 41 */</span>
<a name="l00082"></a>00082 103, <span class="comment">/* 42 */</span>
<a name="l00083"></a>00083 104, <span class="comment">/* 43 */</span>
<a name="l00084"></a>00084 105, <span class="comment">/* 44 */</span>
<a name="l00085"></a>00085 107, <span class="comment">/* 45 */</span>
<a name="l00086"></a>00086 108, <span class="comment">/* 46 */</span>
<a name="l00087"></a>00087 109, <span class="comment">/* 47 */</span>
<a name="l00088"></a>00088 110, <span class="comment">/* 48 */</span>
<a name="l00089"></a>00089 111, <span class="comment">/* 49 */</span>
<a name="l00090"></a>00090 112, <span class="comment">/* 50 */</span>
<a name="l00091"></a>00091 114, <span class="comment">/* 51 */</span>
<a name="l00092"></a>00092 115, <span class="comment">/* 52 */</span>
<a name="l00093"></a>00093 116, <span class="comment">/* 53 */</span>
<a name="l00094"></a>00094 117, <span class="comment">/* 54 */</span>
<a name="l00095"></a>00095 118, <span class="comment">/* 55 */</span>
<a name="l00096"></a>00096 119, <span class="comment">/* 56 */</span>
<a name="l00097"></a>00097 120, <span class="comment">/* 57 */</span>
<a name="l00098"></a>00098 121, <span class="comment">/* 58 */</span>
<a name="l00099"></a>00099 122, <span class="comment">/* 59 */</span>
<a name="l00100"></a>00100 123, <span class="comment">/* 60 */</span>
<a name="l00101"></a>00101 124, <span class="comment">/* 61 */</span>
<a name="l00102"></a>00102 125, <span class="comment">/* 62 */</span>
<a name="l00103"></a>00103 126, <span class="comment">/* 63 */</span>
<a name="l00104"></a>00104 127, <span class="comment">/* 64 */</span>
<a name="l00105"></a>00105 128, <span class="comment">/* 65 */</span>
<a name="l00106"></a>00106 129, <span class="comment">/* 66 */</span>
<a name="l00107"></a>00107 130, <span class="comment">/* 67 */</span>
<a name="l00108"></a>00108 131, <span class="comment">/* 68 */</span>
<a name="l00109"></a>00109 132, <span class="comment">/* 69 */</span>
<a name="l00110"></a>00110 133, <span class="comment">/* 70 */</span>
<a name="l00111"></a>00111 134, <span class="comment">/* 71 */</span>
<a name="l00112"></a>00112 135, <span class="comment">/* 72 */</span>
<a name="l00113"></a>00113 136, <span class="comment">/* 73 */</span>
<a name="l00114"></a>00114 137, <span class="comment">/* 74 */</span>
<a name="l00115"></a>00115 138, <span class="comment">/* 75 */</span>
<a name="l00116"></a>00116 139, <span class="comment">/* 76 */</span>
<a name="l00117"></a>00117 140, <span class="comment">/* 77 */</span>
<a name="l00118"></a>00118 141, <span class="comment">/* 78 */</span>
<a name="l00119"></a>00119 141, <span class="comment">/* 79 */</span>
<a name="l00120"></a>00120 142, <span class="comment">/* 80 */</span>
<a name="l00121"></a>00121 143, <span class="comment">/* 81 */</span>
<a name="l00122"></a>00122 144, <span class="comment">/* 82 */</span>
<a name="l00123"></a>00123 145, <span class="comment">/* 83 */</span>
<a name="l00124"></a>00124 146, <span class="comment">/* 84 */</span>
<a name="l00125"></a>00125 147, <span class="comment">/* 85 */</span>
<a name="l00126"></a>00126 148, <span class="comment">/* 86 */</span>
<a name="l00127"></a>00127 148, <span class="comment">/* 87 */</span>
<a name="l00128"></a>00128 149, <span class="comment">/* 88 */</span>
<a name="l00129"></a>00129 150, <span class="comment">/* 89 */</span>
<a name="l00130"></a>00130 151, <span class="comment">/* 90 */</span>
<a name="l00131"></a>00131 152, <span class="comment">/* 91 */</span>
<a name="l00132"></a>00132 153, <span class="comment">/* 92 */</span>
<a name="l00133"></a>00133 153, <span class="comment">/* 93 */</span>
<a name="l00134"></a>00134 154, <span class="comment">/* 94 */</span>
<a name="l00135"></a>00135 155, <span class="comment">/* 95 */</span>
<a name="l00136"></a>00136 156, <span class="comment">/* 96 */</span>
<a name="l00137"></a>00137 157, <span class="comment">/* 97 */</span>
<a name="l00138"></a>00138 158, <span class="comment">/* 98 */</span>
<a name="l00139"></a>00139 158, <span class="comment">/* 99 */</span>
<a name="l00140"></a>00140 159, <span class="comment">/* 100 */</span>
<a name="l00141"></a>00141 160, <span class="comment">/* 101 */</span>
<a name="l00142"></a>00142 161, <span class="comment">/* 102 */</span>
<a name="l00143"></a>00143 162, <span class="comment">/* 103 */</span>
<a name="l00144"></a>00144 162, <span class="comment">/* 104 */</span>
<a name="l00145"></a>00145 163, <span class="comment">/* 105 */</span>
<a name="l00146"></a>00146 164, <span class="comment">/* 106 */</span>
<a name="l00147"></a>00147 165, <span class="comment">/* 107 */</span>
<a name="l00148"></a>00148 165, <span class="comment">/* 108 */</span>
<a name="l00149"></a>00149 166, <span class="comment">/* 109 */</span>
<a name="l00150"></a>00150 167, <span class="comment">/* 110 */</span>
<a name="l00151"></a>00151 168, <span class="comment">/* 111 */</span>
<a name="l00152"></a>00152 168, <span class="comment">/* 112 */</span>
<a name="l00153"></a>00153 169, <span class="comment">/* 113 */</span>
<a name="l00154"></a>00154 170, <span class="comment">/* 114 */</span>
<a name="l00155"></a>00155 171, <span class="comment">/* 115 */</span>
<a name="l00156"></a>00156 171, <span class="comment">/* 116 */</span>
<a name="l00157"></a>00157 172, <span class="comment">/* 117 */</span>
<a name="l00158"></a>00158 173, <span class="comment">/* 118 */</span>
<a name="l00159"></a>00159 174, <span class="comment">/* 119 */</span>
<a name="l00160"></a>00160 174, <span class="comment">/* 120 */</span>
<a name="l00161"></a>00161 175, <span class="comment">/* 121 */</span>
<a name="l00162"></a>00162 176, <span class="comment">/* 122 */</span>
<a name="l00163"></a>00163 177, <span class="comment">/* 123 */</span>
<a name="l00164"></a>00164 177, <span class="comment">/* 124 */</span>
<a name="l00165"></a>00165 178, <span class="comment">/* 125 */</span>
<a name="l00166"></a>00166 179, <span class="comment">/* 126 */</span>
<a name="l00167"></a>00167 179, <span class="comment">/* 127 */</span>
<a name="l00168"></a>00168 180, <span class="comment">/* 128 */</span>
<a name="l00169"></a>00169 181, <span class="comment">/* 129 */</span>
<a name="l00170"></a>00170 182, <span class="comment">/* 130 */</span>
<a name="l00171"></a>00171 182, <span class="comment">/* 131 */</span>
<a name="l00172"></a>00172 183, <span class="comment">/* 132 */</span>
<a name="l00173"></a>00173 184, <span class="comment">/* 133 */</span>
<a name="l00174"></a>00174 184, <span class="comment">/* 134 */</span>
<a name="l00175"></a>00175 185, <span class="comment">/* 135 */</span>
<a name="l00176"></a>00176 186, <span class="comment">/* 136 */</span>
<a name="l00177"></a>00177 186, <span class="comment">/* 137 */</span>
<a name="l00178"></a>00178 187, <span class="comment">/* 138 */</span>
<a name="l00179"></a>00179 188, <span class="comment">/* 139 */</span>
<a name="l00180"></a>00180 188, <span class="comment">/* 140 */</span>
<a name="l00181"></a>00181 189, <span class="comment">/* 141 */</span>
<a name="l00182"></a>00182 190, <span class="comment">/* 142 */</span>
<a name="l00183"></a>00183 190, <span class="comment">/* 143 */</span>
<a name="l00184"></a>00184 191, <span class="comment">/* 144 */</span>
<a name="l00185"></a>00185 192, <span class="comment">/* 145 */</span>
<a name="l00186"></a>00186 192, <span class="comment">/* 146 */</span>
<a name="l00187"></a>00187 193, <span class="comment">/* 147 */</span>
<a name="l00188"></a>00188 194, <span class="comment">/* 148 */</span>
<a name="l00189"></a>00189 194, <span class="comment">/* 149 */</span>
<a name="l00190"></a>00190 195, <span class="comment">/* 150 */</span>
<a name="l00191"></a>00191 196, <span class="comment">/* 151 */</span>
<a name="l00192"></a>00192 196, <span class="comment">/* 152 */</span>
<a name="l00193"></a>00193 197, <span class="comment">/* 153 */</span>
<a name="l00194"></a>00194 198, <span class="comment">/* 154 */</span>
<a name="l00195"></a>00195 198, <span class="comment">/* 155 */</span>
<a name="l00196"></a>00196 199, <span class="comment">/* 156 */</span>
<a name="l00197"></a>00197 200, <span class="comment">/* 157 */</span>
<a name="l00198"></a>00198 200, <span class="comment">/* 158 */</span>
<a name="l00199"></a>00199 201, <span class="comment">/* 159 */</span>
<a name="l00200"></a>00200 201, <span class="comment">/* 160 */</span>
<a name="l00201"></a>00201 202, <span class="comment">/* 161 */</span>
<a name="l00202"></a>00202 203, <span class="comment">/* 162 */</span>
<a name="l00203"></a>00203 203, <span class="comment">/* 163 */</span>
<a name="l00204"></a>00204 204, <span class="comment">/* 164 */</span>
<a name="l00205"></a>00205 205, <span class="comment">/* 165 */</span>
<a name="l00206"></a>00206 205, <span class="comment">/* 166 */</span>
<a name="l00207"></a>00207 206, <span class="comment">/* 167 */</span>
<a name="l00208"></a>00208 206, <span class="comment">/* 168 */</span>
<a name="l00209"></a>00209 207, <span class="comment">/* 169 */</span>
<a name="l00210"></a>00210 208, <span class="comment">/* 170 */</span>
<a name="l00211"></a>00211 208, <span class="comment">/* 171 */</span>
<a name="l00212"></a>00212 209, <span class="comment">/* 172 */</span>
<a name="l00213"></a>00213 210, <span class="comment">/* 173 */</span>
<a name="l00214"></a>00214 210, <span class="comment">/* 174 */</span>
<a name="l00215"></a>00215 211, <span class="comment">/* 175 */</span>
<a name="l00216"></a>00216 211, <span class="comment">/* 176 */</span>
<a name="l00217"></a>00217 212, <span class="comment">/* 177 */</span>
<a name="l00218"></a>00218 213, <span class="comment">/* 178 */</span>
<a name="l00219"></a>00219 213, <span class="comment">/* 179 */</span>
<a name="l00220"></a>00220 214, <span class="comment">/* 180 */</span>
<a name="l00221"></a>00221 214, <span class="comment">/* 181 */</span>
<a name="l00222"></a>00222 215, <span class="comment">/* 182 */</span>
<a name="l00223"></a>00223 216, <span class="comment">/* 183 */</span>
<a name="l00224"></a>00224 216, <span class="comment">/* 184 */</span>
<a name="l00225"></a>00225 217, <span class="comment">/* 185 */</span>
<a name="l00226"></a>00226 217, <span class="comment">/* 186 */</span>
<a name="l00227"></a>00227 218, <span class="comment">/* 187 */</span>
<a name="l00228"></a>00228 218, <span class="comment">/* 188 */</span>
<a name="l00229"></a>00229 219, <span class="comment">/* 189 */</span>
<a name="l00230"></a>00230 220, <span class="comment">/* 190 */</span>
<a name="l00231"></a>00231 220, <span class="comment">/* 191 */</span>
<a name="l00232"></a>00232 221, <span class="comment">/* 192 */</span>
<a name="l00233"></a>00233 221, <span class="comment">/* 193 */</span>
<a name="l00234"></a>00234 222, <span class="comment">/* 194 */</span>
<a name="l00235"></a>00235 222, <span class="comment">/* 195 */</span>
<a name="l00236"></a>00236 223, <span class="comment">/* 196 */</span>
<a name="l00237"></a>00237 224, <span class="comment">/* 197 */</span>
<a name="l00238"></a>00238 224, <span class="comment">/* 198 */</span>
<a name="l00239"></a>00239 225, <span class="comment">/* 199 */</span>
<a name="l00240"></a>00240 225, <span class="comment">/* 200 */</span>
<a name="l00241"></a>00241 226, <span class="comment">/* 201 */</span>
<a name="l00242"></a>00242 226, <span class="comment">/* 202 */</span>
<a name="l00243"></a>00243 227, <span class="comment">/* 203 */</span>
<a name="l00244"></a>00244 228, <span class="comment">/* 204 */</span>
<a name="l00245"></a>00245 228, <span class="comment">/* 205 */</span>
<a name="l00246"></a>00246 229, <span class="comment">/* 206 */</span>
<a name="l00247"></a>00247 229, <span class="comment">/* 207 */</span>
<a name="l00248"></a>00248 230, <span class="comment">/* 208 */</span>
<a name="l00249"></a>00249 230, <span class="comment">/* 209 */</span>
<a name="l00250"></a>00250 231, <span class="comment">/* 210 */</span>
<a name="l00251"></a>00251 231, <span class="comment">/* 211 */</span>
<a name="l00252"></a>00252 232, <span class="comment">/* 212 */</span>
<a name="l00253"></a>00253 233, <span class="comment">/* 213 */</span>
<a name="l00254"></a>00254 233, <span class="comment">/* 214 */</span>
<a name="l00255"></a>00255 234, <span class="comment">/* 215 */</span>
<a name="l00256"></a>00256 234, <span class="comment">/* 216 */</span>
<a name="l00257"></a>00257 235, <span class="comment">/* 217 */</span>
<a name="l00258"></a>00258 235, <span class="comment">/* 218 */</span>
<a name="l00259"></a>00259 236, <span class="comment">/* 219 */</span>
<a name="l00260"></a>00260 236, <span class="comment">/* 220 */</span>
<a name="l00261"></a>00261 237, <span class="comment">/* 221 */</span>
<a name="l00262"></a>00262 237, <span class="comment">/* 222 */</span>
<a name="l00263"></a>00263 238, <span class="comment">/* 223 */</span>
<a name="l00264"></a>00264 238, <span class="comment">/* 224 */</span>
<a name="l00265"></a>00265 239, <span class="comment">/* 225 */</span>
<a name="l00266"></a>00266 240, <span class="comment">/* 226 */</span>
<a name="l00267"></a>00267 240, <span class="comment">/* 227 */</span>
<a name="l00268"></a>00268 241, <span class="comment">/* 228 */</span>
<a name="l00269"></a>00269 241, <span class="comment">/* 229 */</span>
<a name="l00270"></a>00270 242, <span class="comment">/* 230 */</span>
<a name="l00271"></a>00271 242, <span class="comment">/* 231 */</span>
<a name="l00272"></a>00272 243, <span class="comment">/* 232 */</span>
<a name="l00273"></a>00273 243, <span class="comment">/* 233 */</span>
<a name="l00274"></a>00274 244, <span class="comment">/* 234 */</span>
<a name="l00275"></a>00275 244, <span class="comment">/* 235 */</span>
<a name="l00276"></a>00276 245, <span class="comment">/* 236 */</span>
<a name="l00277"></a>00277 245, <span class="comment">/* 237 */</span>
<a name="l00278"></a>00278 246, <span class="comment">/* 238 */</span>
<a name="l00279"></a>00279 246, <span class="comment">/* 239 */</span>
<a name="l00280"></a>00280 247, <span class="comment">/* 240 */</span>
<a name="l00281"></a>00281 247, <span class="comment">/* 241 */</span>
<a name="l00282"></a>00282 248, <span class="comment">/* 242 */</span>
<a name="l00283"></a>00283 248, <span class="comment">/* 243 */</span>
<a name="l00284"></a>00284 249, <span class="comment">/* 244 */</span>
<a name="l00285"></a>00285 249, <span class="comment">/* 245 */</span>
<a name="l00286"></a>00286 250, <span class="comment">/* 246 */</span>
<a name="l00287"></a>00287 250, <span class="comment">/* 247 */</span>
<a name="l00288"></a>00288 251, <span class="comment">/* 248 */</span>
<a name="l00289"></a>00289 251, <span class="comment">/* 249 */</span>
<a name="l00290"></a>00290 252, <span class="comment">/* 250 */</span>
<a name="l00291"></a>00291 252, <span class="comment">/* 251 */</span>
<a name="l00292"></a>00292 253, <span class="comment">/* 252 */</span>
<a name="l00293"></a>00293 253, <span class="comment">/* 253 */</span>
<a name="l00294"></a>00294 254, <span class="comment">/* 254 */</span>
<a name="l00295"></a>00295 255 <span class="comment">/* 255 */</span>
<a name="l00296"></a>00296 };
<a name="l00297"></a>00297
<a name="l00306"></a><a class="code" href="_s_d_l__gfx_blit_func_8c.html#a7ec9cde56a58eee4e6182c32dd8cbee7">00306</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l__gfx_blit_func_8c.html#a7ec9cde56a58eee4e6182c32dd8cbee7" title="Internal blitter using adjusted destination alpha during RGBA->RGBA blits.">_SDL_gfxBlitBlitterRGBA</a>(<a class="code" href="struct_s_d_l__gfx_blit_info.html" title="The structure passed to the low level blit functions.">SDL_gfxBlitInfo</a> * info)
<a name="l00307"></a>00307 {
<a name="l00308"></a>00308 <span class="keywordtype">int</span> width = info-><a class="code" href="struct_s_d_l__gfx_blit_info.html#ad49412925c79a9894ea598530ea39b00">d_width</a>;
<a name="l00309"></a>00309 <span class="keywordtype">int</span> height = info-><a class="code" href="struct_s_d_l__gfx_blit_info.html#ad31494204fdd3d2cb30faba527cfb9fa">d_height</a>;
<a name="l00310"></a>00310 Uint8 *src = info-><a class="code" href="struct_s_d_l__gfx_blit_info.html#a03dd1de15b100cd491eff7d823284189">s_pixels</a>;
<a name="l00311"></a>00311 <span class="keywordtype">int</span> srcskip = info-><a class="code" href="struct_s_d_l__gfx_blit_info.html#a25b822e4773e1db6d38aadc5c0bb126f">s_skip</a>;
<a name="l00312"></a>00312 Uint8 *dst = info-><a class="code" href="struct_s_d_l__gfx_blit_info.html#ae9146d0f8b236274984127a7a1528966">d_pixels</a>;
<a name="l00313"></a>00313 <span class="keywordtype">int</span> dstskip = info-><a class="code" href="struct_s_d_l__gfx_blit_info.html#a9055858de99c49d16ef903fed31715b7">d_skip</a>;
<a name="l00314"></a>00314 SDL_PixelFormat *srcfmt = info-><a class="code" href="struct_s_d_l__gfx_blit_info.html#a1ce90142d08a06fede5e2a13d66d17f6">src</a>;
<a name="l00315"></a>00315 SDL_PixelFormat *dstfmt = info-><a class="code" href="struct_s_d_l__gfx_blit_info.html#a177d476cb937246853b74253490436db">dst</a>;
<a name="l00316"></a>00316 Uint8 srcbpp = srcfmt->BytesPerPixel;
<a name="l00317"></a>00317 Uint8 dstbpp = dstfmt->BytesPerPixel;
<a name="l00318"></a>00318
<a name="l00319"></a>00319 <span class="keywordflow">while</span> (height--) {
<a name="l00320"></a>00320 <a class="code" href="_s_d_l__gfx_blit_func_8h.html#a44c498dca765a515f40eecad8f19aac4" title="4-times unrolled DUFFs loop.">GFX_DUFFS_LOOP4</a>( {
<a name="l00321"></a>00321 Uint32 pixel;
<a name="l00322"></a>00322 <span class="keywordtype">unsigned</span> sR;
<a name="l00323"></a>00323 <span class="keywordtype">unsigned</span> sG;
<a name="l00324"></a>00324 <span class="keywordtype">unsigned</span> sB;
<a name="l00325"></a>00325 <span class="keywordtype">unsigned</span> sA;
<a name="l00326"></a>00326 <span class="keywordtype">unsigned</span> dR;
<a name="l00327"></a>00327 <span class="keywordtype">unsigned</span> dG;
<a name="l00328"></a>00328 <span class="keywordtype">unsigned</span> dB;
<a name="l00329"></a>00329 <span class="keywordtype">unsigned</span> dA;
<a name="l00330"></a>00330 <span class="keywordtype">unsigned</span> sAA;
<a name="l00331"></a>00331 <a class="code" href="_s_d_l__gfx_blit_func_8h.html#a7dda3984ca04929e2ea0a3679f7452a9" title="Disassemble buffer pointer into a pixel and separate RGBA values.">GFX_DISASSEMBLE_RGBA</a>(src, srcbpp, srcfmt, pixel, sR, sG, sB, sA);
<a name="l00332"></a>00332 <a class="code" href="_s_d_l__gfx_blit_func_8h.html#a7dda3984ca04929e2ea0a3679f7452a9" title="Disassemble buffer pointer into a pixel and separate RGBA values.">GFX_DISASSEMBLE_RGBA</a>(dst, dstbpp, dstfmt, pixel, dR, dG, dB, dA);
<a name="l00333"></a>00333 sAA=<a class="code" href="_s_d_l__gfx_blit_func_8c.html#a6d0c17342154e14322a281603960691a" title="Alpha adjustment table for custom blitter.">GFX_ALPHA_ADJUST_ARRAY</a>[sA & 255];
<a name="l00334"></a>00334 <a class="code" href="_s_d_l__gfx_blit_func_8h.html#ae3efb9e67172838c394c148a62822da6" title="Blend the RGB values of two pixels based on a source alpha value.">GFX_ALPHA_BLEND</a>(sR, sG, sB, sAA, dR, dG, dB);
<a name="l00335"></a>00335 dA |= sAA;
<a name="l00336"></a>00336 <a class="code" href="_s_d_l__gfx_blit_func_8h.html#a4e59f926fb98a86c01a4ffc5cc20e8d5" title="Assemble pixel into buffer pointer from separate RGBA values.">GFX_ASSEMBLE_RGBA</a>(dst, dstbpp, dstfmt, dR, dG, dB, dA);
<a name="l00337"></a>00337 src += srcbpp; dst += dstbpp;
<a name="l00338"></a>00338 }, width);
<a name="l00339"></a>00339 src += srcskip;
<a name="l00340"></a>00340 dst += dstskip;
<a name="l00341"></a>00341 }
<a name="l00342"></a>00342 }
<a name="l00343"></a>00343
<a name="l00356"></a><a class="code" href="_s_d_l__gfx_blit_func_8c.html#a9375eac21cc799258f971034a3be57b5">00356</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l__gfx_blit_func_8c.html#a9375eac21cc799258f971034a3be57b5" title="Internal blitter setup wrapper for RGBA->RGBA blits.">_SDL_gfxBlitRGBACall</a>(SDL_Surface * src, SDL_Rect * srcrect, SDL_Surface * dst, SDL_Rect * dstrect)
<a name="l00357"></a>00357 {
<a name="l00358"></a>00358 <span class="comment">/*</span>
<a name="l00359"></a>00359 <span class="comment"> * Set up source and destination buffer pointers, then blit </span>
<a name="l00360"></a>00360 <span class="comment"> */</span>
<a name="l00361"></a>00361 <span class="keywordflow">if</span> (srcrect->w && srcrect->h) {
<a name="l00362"></a>00362 <a class="code" href="struct_s_d_l__gfx_blit_info.html" title="The structure passed to the low level blit functions.">SDL_gfxBlitInfo</a> info;
<a name="l00363"></a>00363
<a name="l00364"></a>00364 <span class="comment">/*</span>
<a name="l00365"></a>00365 <span class="comment"> * Set up the blit information </span>
<a name="l00366"></a>00366 <span class="comment"> */</span>
<a name="l00367"></a>00367 <span class="preprocessor">#if (SDL_MINOR_VERSION == 3)</span>
<a name="l00368"></a>00368 <span class="preprocessor"></span> info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#a03dd1de15b100cd491eff7d823284189">s_pixels</a> = (Uint8 *) src->pixels + (Uint16) srcrect->y * src->pitch + (Uint16) srcrect->x * src->format->BytesPerPixel;
<a name="l00369"></a>00369 #<span class="keywordflow">else</span>
<a name="l00370"></a>00370 info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#a03dd1de15b100cd491eff7d823284189">s_pixels</a> = (Uint8 *) src->pixels + src->offset + (Uint16) srcrect->y * src->pitch + (Uint16) srcrect->x * src->format->BytesPerPixel;
<a name="l00371"></a>00371 <span class="preprocessor">#endif</span>
<a name="l00372"></a>00372 <span class="preprocessor"></span> info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#ad2f7fa9a764e75639fdb6e3b0f8a68fc">s_width</a> = srcrect->w;
<a name="l00373"></a>00373 info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#aeeec65f001e54fb93ba97cb85cb61592">s_height</a> = srcrect->h;
<a name="l00374"></a>00374 info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#a25b822e4773e1db6d38aadc5c0bb126f">s_skip</a> = (int)(src->pitch - info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#ad2f7fa9a764e75639fdb6e3b0f8a68fc">s_width</a> * src->format->BytesPerPixel);
<a name="l00375"></a>00375 <span class="preprocessor">#if (SDL_MINOR_VERSION == 3)</span>
<a name="l00376"></a>00376 <span class="preprocessor"></span> info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#ae9146d0f8b236274984127a7a1528966">d_pixels</a> = (Uint8 *) dst->pixels + (Uint16) dstrect->y * dst->pitch + (Uint16) dstrect->x * dst->format->BytesPerPixel;
<a name="l00377"></a>00377 #<span class="keywordflow">else</span>
<a name="l00378"></a>00378 info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#ae9146d0f8b236274984127a7a1528966">d_pixels</a> = (Uint8 *) dst->pixels + dst->offset + (Uint16) dstrect->y * dst->pitch + (Uint16) dstrect->x * dst->format->BytesPerPixel;
<a name="l00379"></a>00379 <span class="preprocessor">#endif</span>
<a name="l00380"></a>00380 <span class="preprocessor"></span> info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#ad49412925c79a9894ea598530ea39b00">d_width</a> = dstrect->w;
<a name="l00381"></a>00381 info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#ad31494204fdd3d2cb30faba527cfb9fa">d_height</a> = dstrect->h;
<a name="l00382"></a>00382 info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#a9055858de99c49d16ef903fed31715b7">d_skip</a> = (int)(dst->pitch - info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#ad49412925c79a9894ea598530ea39b00">d_width</a> * dst->format->BytesPerPixel);
<a name="l00383"></a>00383 info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#a4b938ad61daa0a9625c6892fd46f32a2">aux_data</a> = NULL;
<a name="l00384"></a>00384 info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#a1ce90142d08a06fede5e2a13d66d17f6">src</a> = src->format;
<a name="l00385"></a>00385 info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#a9596f5ea6998964e6240fae7ac17ce1e">table</a> = NULL;
<a name="l00386"></a>00386 info.<a class="code" href="struct_s_d_l__gfx_blit_info.html#a177d476cb937246853b74253490436db">dst</a> = dst->format;
<a name="l00387"></a>00387
<a name="l00388"></a>00388 <span class="comment">/*</span>
<a name="l00389"></a>00389 <span class="comment"> * Run the actual software blitter </span>
<a name="l00390"></a>00390 <span class="comment"> */</span>
<a name="l00391"></a>00391 <a class="code" href="_s_d_l__gfx_blit_func_8c.html#a7ec9cde56a58eee4e6182c32dd8cbee7" title="Internal blitter using adjusted destination alpha during RGBA->RGBA blits.">_SDL_gfxBlitBlitterRGBA</a>(&info);
<a name="l00392"></a>00392 <span class="keywordflow">return</span> 1;
<a name="l00393"></a>00393 }
<a name="l00394"></a>00394
<a name="l00395"></a>00395 <span class="keywordflow">return</span> (0);
<a name="l00396"></a>00396 }
<a name="l00397"></a>00397
<a name="l00411"></a><a class="code" href="_s_d_l__gfx_blit_func_8h.html#ab49c560e89b8305051b2e6b347215f03">00411</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l__gfx_blit_func_8c.html#ac51ff40d39f3dd0bd08116e8953960f8" title="Blitter for RGBA->RGBA blits with alpha adjustment.">SDL_gfxBlitRGBA</a>(SDL_Surface * src, SDL_Rect * srcrect, SDL_Surface * dst, SDL_Rect * dstrect)
<a name="l00412"></a>00412 {
<a name="l00413"></a>00413 SDL_Rect sr, dr;
<a name="l00414"></a>00414 <span class="keywordtype">int</span> srcx, srcy, w, h;
<a name="l00415"></a>00415
<a name="l00416"></a>00416 <span class="comment">/*</span>
<a name="l00417"></a>00417 <span class="comment"> * Make sure the surfaces aren't locked </span>
<a name="l00418"></a>00418 <span class="comment"> */</span>
<a name="l00419"></a>00419 <span class="keywordflow">if</span> (!src || !dst) {
<a name="l00420"></a>00420 SDL_SetError(<span class="stringliteral">"SDL_UpperBlit: passed a NULL surface"</span>);
<a name="l00421"></a>00421 <span class="keywordflow">return</span> (-1);
<a name="l00422"></a>00422 }
<a name="l00423"></a>00423 <span class="keywordflow">if</span> ((src->locked) || (dst->locked)) {
<a name="l00424"></a>00424 SDL_SetError(<span class="stringliteral">"Surfaces must not be locked during blit"</span>);
<a name="l00425"></a>00425 <span class="keywordflow">return</span> (-1);
<a name="l00426"></a>00426 }
<a name="l00427"></a>00427
<a name="l00428"></a>00428 <span class="comment">/*</span>
<a name="l00429"></a>00429 <span class="comment"> * If the destination rectangle is NULL, use the entire dest surface </span>
<a name="l00430"></a>00430 <span class="comment"> */</span>
<a name="l00431"></a>00431 <span class="keywordflow">if</span> (dstrect == NULL) {
<a name="l00432"></a>00432 dr.x = dr.y = 0;
<a name="l00433"></a>00433 dr.w = dst->w;
<a name="l00434"></a>00434 dr.h = dst->h;
<a name="l00435"></a>00435 } <span class="keywordflow">else</span> {
<a name="l00436"></a>00436 dr = *dstrect;
<a name="l00437"></a>00437 }
<a name="l00438"></a>00438
<a name="l00439"></a>00439 <span class="comment">/*</span>
<a name="l00440"></a>00440 <span class="comment"> * Clip the source rectangle to the source surface </span>
<a name="l00441"></a>00441 <span class="comment"> */</span>
<a name="l00442"></a>00442 <span class="keywordflow">if</span> (srcrect) {
<a name="l00443"></a>00443 <span class="keywordtype">int</span> maxw, maxh;
<a name="l00444"></a>00444
<a name="l00445"></a>00445 srcx = srcrect->x;
<a name="l00446"></a>00446 w = srcrect->w;
<a name="l00447"></a>00447 <span class="keywordflow">if</span> (srcx < 0) {
<a name="l00448"></a>00448 w += srcx;
<a name="l00449"></a>00449 dr.x -= srcx;
<a name="l00450"></a>00450 srcx = 0;
<a name="l00451"></a>00451 }
<a name="l00452"></a>00452 maxw = src->w - srcx;
<a name="l00453"></a>00453 <span class="keywordflow">if</span> (maxw < w)
<a name="l00454"></a>00454 w = maxw;
<a name="l00455"></a>00455
<a name="l00456"></a>00456 srcy = srcrect->y;
<a name="l00457"></a>00457 h = srcrect->h;
<a name="l00458"></a>00458 <span class="keywordflow">if</span> (srcy < 0) {
<a name="l00459"></a>00459 h += srcy;
<a name="l00460"></a>00460 dr.y -= srcy;
<a name="l00461"></a>00461 srcy = 0;
<a name="l00462"></a>00462 }
<a name="l00463"></a>00463 maxh = src->h - srcy;
<a name="l00464"></a>00464 <span class="keywordflow">if</span> (maxh < h)
<a name="l00465"></a>00465 h = maxh;
<a name="l00466"></a>00466
<a name="l00467"></a>00467 } <span class="keywordflow">else</span> {
<a name="l00468"></a>00468 srcx = srcy = 0;
<a name="l00469"></a>00469 w = src->w;
<a name="l00470"></a>00470 h = src->h;
<a name="l00471"></a>00471 }
<a name="l00472"></a>00472
<a name="l00473"></a>00473 <span class="comment">/*</span>
<a name="l00474"></a>00474 <span class="comment"> * Clip the destination rectangle against the clip rectangle </span>
<a name="l00475"></a>00475 <span class="comment"> */</span>
<a name="l00476"></a>00476 {
<a name="l00477"></a>00477 SDL_Rect *clip = &dst->clip_rect;
<a name="l00478"></a>00478 <span class="keywordtype">int</span> dx, dy;
<a name="l00479"></a>00479
<a name="l00480"></a>00480 dx = clip->x - dr.x;
<a name="l00481"></a>00481 <span class="keywordflow">if</span> (dx > 0) {
<a name="l00482"></a>00482 w -= dx;
<a name="l00483"></a>00483 dr.x += dx;
<a name="l00484"></a>00484 srcx += dx;
<a name="l00485"></a>00485 }
<a name="l00486"></a>00486 dx = dr.x + w - clip->x - clip->w;
<a name="l00487"></a>00487 <span class="keywordflow">if</span> (dx > 0)
<a name="l00488"></a>00488 w -= dx;
<a name="l00489"></a>00489
<a name="l00490"></a>00490 dy = clip->y - dr.y;
<a name="l00491"></a>00491 <span class="keywordflow">if</span> (dy > 0) {
<a name="l00492"></a>00492 h -= dy;
<a name="l00493"></a>00493 dr.y += dy;
<a name="l00494"></a>00494 srcy += dy;
<a name="l00495"></a>00495 }
<a name="l00496"></a>00496 dy = dr.y + h - clip->y - clip->h;
<a name="l00497"></a>00497 <span class="keywordflow">if</span> (dy > 0)
<a name="l00498"></a>00498 h -= dy;
<a name="l00499"></a>00499 }
<a name="l00500"></a>00500
<a name="l00501"></a>00501 <span class="keywordflow">if</span> (w > 0 && h > 0) {
<a name="l00502"></a>00502 sr.x = srcx;
<a name="l00503"></a>00503 sr.y = srcy;
<a name="l00504"></a>00504 sr.w = dr.w = w;
<a name="l00505"></a>00505 sr.h = dr.h = h;
<a name="l00506"></a>00506 <span class="keywordflow">return</span> (<a class="code" href="_s_d_l__gfx_blit_func_8c.html#a9375eac21cc799258f971034a3be57b5" title="Internal blitter setup wrapper for RGBA->RGBA blits.">_SDL_gfxBlitRGBACall</a>(src, &sr, dst, &dr));
<a name="l00507"></a>00507 }
<a name="l00508"></a>00508
<a name="l00509"></a>00509 <span class="keywordflow">return</span> 0;
<a name="l00510"></a>00510 }
<a name="l00511"></a>00511
<a name="l00524"></a><a class="code" href="_s_d_l__gfx_blit_func_8h.html#a4627ae4a0037d0b248bed87f3c294735">00524</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l__gfx_blit_func_8c.html#a09a376775f9d8c933c7121e34fe5ecfc" title="Sets the alpha channel in a 32 bit surface.">SDL_gfxSetAlpha</a>(SDL_Surface *src, Uint8 a)
<a name="l00525"></a>00525 {
<a name="l00526"></a>00526 <span class="preprocessor">#if SDL_BYTEORDER == SDL_BIG_ENDIAN</span>
<a name="l00527"></a>00527 <span class="preprocessor"></span> <span class="keyword">const</span> <span class="keywordtype">int</span> alpha_offset = 0;
<a name="l00528"></a>00528 <span class="preprocessor">#else</span>
<a name="l00529"></a>00529 <span class="preprocessor"></span> <span class="keyword">const</span> <span class="keywordtype">int</span> alpha_offset = 3;
<a name="l00530"></a>00530 <span class="preprocessor">#endif</span>
<a name="l00531"></a>00531 <span class="preprocessor"></span> <span class="keywordtype">int</span> i, j, row_skip;
<a name="l00532"></a>00532 Uint8 *pixels;
<a name="l00533"></a>00533
<a name="l00534"></a>00534 <span class="comment">/* Check if we have a 32bit surface */</span>
<a name="l00535"></a>00535 <span class="keywordflow">if</span> ( (src==NULL) ||
<a name="l00536"></a>00536 (src->format==NULL) ||
<a name="l00537"></a>00537 (src->format->BytesPerPixel!=4) ) {
<a name="l00538"></a>00538 SDL_SetError(<span class="stringliteral">"SDL_gfxSetAlpha: Invalid input surface."</span>);
<a name="l00539"></a>00539 <span class="keywordflow">return</span> -1;
<a name="l00540"></a>00540 }
<a name="l00541"></a>00541
<a name="l00542"></a>00542 <span class="comment">/*</span>
<a name="l00543"></a>00543 <span class="comment"> * Lock the surface </span>
<a name="l00544"></a>00544 <span class="comment"> */</span>
<a name="l00545"></a>00545 <span class="keywordflow">if</span> (SDL_MUSTLOCK(src)) {
<a name="l00546"></a>00546 <span class="keywordflow">if</span> (SDL_LockSurface(src) < 0) {
<a name="l00547"></a>00547 <span class="keywordflow">return</span> (-1);
<a name="l00548"></a>00548 }
<a name="l00549"></a>00549 }
<a name="l00550"></a>00550
<a name="l00551"></a>00551 <span class="comment">/* Process */</span>
<a name="l00552"></a>00552 pixels = (Uint8 *)src->pixels;
<a name="l00553"></a>00553 row_skip = (src->pitch - (4*src->w));
<a name="l00554"></a>00554 pixels += alpha_offset;
<a name="l00555"></a>00555 <span class="keywordflow">for</span> ( i=0; i<src->h; i++ ) {
<a name="l00556"></a>00556 <span class="keywordflow">for</span> ( j=0; j<src->w; j++ ) {
<a name="l00557"></a>00557 *pixels = a;
<a name="l00558"></a>00558 pixels += 4;
<a name="l00559"></a>00559 }
<a name="l00560"></a>00560 pixels += row_skip;
<a name="l00561"></a>00561 }
<a name="l00562"></a>00562
<a name="l00563"></a>00563 <span class="comment">/*</span>
<a name="l00564"></a>00564 <span class="comment"> * Unlock surface </span>
<a name="l00565"></a>00565 <span class="comment"> */</span>
<a name="l00566"></a>00566 <span class="keywordflow">if</span> (SDL_MUSTLOCK(src)) {
<a name="l00567"></a>00567 SDL_UnlockSurface(src);
<a name="l00568"></a>00568 }
<a name="l00569"></a>00569
<a name="l00570"></a>00570 <span class="keywordflow">return</span> 1;
<a name="l00571"></a>00571 }
<a name="l00572"></a>00572
<a name="l00587"></a><a class="code" href="_s_d_l__gfx_blit_func_8h.html#a7c93594525ae349b5cef0156b8f758fc">00587</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l__gfx_blit_func_8c.html#a4ece530dca0ae46b1f5a780f85371687" title="Multiply the alpha channel in a 32bit surface.">SDL_gfxMultiplyAlpha</a>(SDL_Surface *src, Uint8 a)
<a name="l00588"></a>00588 {
<a name="l00589"></a>00589 <span class="preprocessor">#if SDL_BYTEORDER == SDL_BIG_ENDIAN</span>
<a name="l00590"></a>00590 <span class="preprocessor"></span> <span class="keyword">const</span> <span class="keywordtype">int</span> alpha_offset = 0;
<a name="l00591"></a>00591 <span class="preprocessor">#else</span>
<a name="l00592"></a>00592 <span class="preprocessor"></span> <span class="keyword">const</span> <span class="keywordtype">int</span> alpha_offset = 3;
<a name="l00593"></a>00593 <span class="preprocessor">#endif</span>
<a name="l00594"></a>00594 <span class="preprocessor"></span> <span class="keywordtype">int</span> i, j, row_skip;
<a name="l00595"></a>00595 Uint8 *pixels;
<a name="l00596"></a>00596
<a name="l00597"></a>00597 <span class="comment">/* Check if we have a 32bit surface */</span>
<a name="l00598"></a>00598 <span class="keywordflow">if</span> ( (src==NULL) ||
<a name="l00599"></a>00599 (src->format==NULL) ||
<a name="l00600"></a>00600 (src->format->BytesPerPixel!=4) ) {
<a name="l00601"></a>00601 SDL_SetError(<span class="stringliteral">"SDL_gfxMultiplyAlpha: Invalid input surface."</span>);
<a name="l00602"></a>00602 <span class="keywordflow">return</span> -1;
<a name="l00603"></a>00603 }
<a name="l00604"></a>00604
<a name="l00605"></a>00605 <span class="comment">/* Check if multiplication is needed */</span>
<a name="l00606"></a>00606 <span class="keywordflow">if</span> (a==255) {
<a name="l00607"></a>00607 <span class="keywordflow">return</span> 0;
<a name="l00608"></a>00608 }
<a name="l00609"></a>00609
<a name="l00610"></a>00610 <span class="comment">/*</span>
<a name="l00611"></a>00611 <span class="comment"> * Lock the surface </span>
<a name="l00612"></a>00612 <span class="comment"> */</span>
<a name="l00613"></a>00613 <span class="keywordflow">if</span> (SDL_MUSTLOCK(src)) {
<a name="l00614"></a>00614 <span class="keywordflow">if</span> (SDL_LockSurface(src) < 0) {
<a name="l00615"></a>00615 <span class="keywordflow">return</span> (-1);
<a name="l00616"></a>00616 }
<a name="l00617"></a>00617 }
<a name="l00618"></a>00618
<a name="l00619"></a>00619 <span class="comment">/* Process */</span>
<a name="l00620"></a>00620 pixels = (Uint8 *)src->pixels;
<a name="l00621"></a>00621 row_skip = (src->pitch - (4*src->w));
<a name="l00622"></a>00622 pixels += alpha_offset;
<a name="l00623"></a>00623 <span class="keywordflow">for</span> ( i=0; i<src->h; i++ ) {
<a name="l00624"></a>00624 <span class="keywordflow">for</span> ( j=0; j<src->w; j++ ) {
<a name="l00625"></a>00625 *pixels = (Uint8)(((<span class="keywordtype">int</span>)(*pixels)*a)>>8);
<a name="l00626"></a>00626 pixels += 4;
<a name="l00627"></a>00627 }
<a name="l00628"></a>00628 pixels += row_skip;
<a name="l00629"></a>00629 }
<a name="l00630"></a>00630
<a name="l00631"></a>00631 <span class="comment">/*</span>
<a name="l00632"></a>00632 <span class="comment"> * Unlock surface </span>
<a name="l00633"></a>00633 <span class="comment"> */</span>
<a name="l00634"></a>00634 <span class="keywordflow">if</span> (SDL_MUSTLOCK(src)) {
<a name="l00635"></a>00635 SDL_UnlockSurface(src);
<a name="l00636"></a>00636 }
<a name="l00637"></a>00637
<a name="l00638"></a>00638 <span class="keywordflow">return</span> 1;
<a name="l00639"></a>00639 }
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