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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>SDL2_gfx: /cygdrive/i/Sources/sdl2gfx/SDL2_rotozoom.c Source File</title>
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<td id="projectalign" style="padding-left: 0.5em;">
<div id="projectname">SDL2_gfx
 <span id="projectnumber">1.0.2</span>
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<div id="projectbrief">GraphicsprimitivesandsurfacefunctionsforSDL2</div>
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<li><a href="annotated.html"><span>Data Structures</span></a></li>
<li class="current"><a href="files.html"><span>Files</span></a></li>
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<div class="headertitle">
<div class="title">/cygdrive/i/Sources/sdl2gfx/SDL2_rotozoom.c</div> </div>
</div><!--header-->
<div class="contents">
<a href="_s_d_l2__rotozoom_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/* </span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"></span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">SDL2_rotozoom.c: rotozoomer, zoomer and shrinker for 32bit or 8bit surfaces</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"></span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">Copyright (C) 2012-2014 Andreas Schiffler</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"></span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">This software is provided 'as-is', without any express or implied</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">warranty. In no event will the authors be held liable for any damages</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">arising from the use of this software.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"></span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">Permission is granted to anyone to use this software for any purpose,</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">including commercial applications, and to alter it and redistribute it</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">freely, subject to the following restrictions:</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"></span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">1. The origin of this software must not be misrepresented; you must not</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">claim that you wrote the original software. If you use this software</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">in a product, an acknowledgment in the product documentation would be</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">appreciated but is not required.</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"></span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">2. Altered source versions must be plainly marked as such, and must not be</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">misrepresented as being the original software.</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">3. This notice may not be removed or altered from any source</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment">distribution.</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"></span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">Andreas Schiffler -- aschiffler at ferzkopp dot net</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#ifdef WIN32</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#include <windows.h></span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor">#include <string.h></span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#include "<a class="code" href="_s_d_l2__rotozoom_8h.html">SDL2_rotozoom.h</a>"</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">/* ---- Internally used structures */</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div>
<div class="line"><a name="l00044"></a><span class="lineno"><a class="line" href="structt_color_r_g_b_a.html"> 44</a></span> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> {</div>
<div class="line"><a name="l00045"></a><span class="lineno"><a class="line" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd"> 45</a></span>  Uint8 <a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>;</div>
<div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43"> 46</a></span>  Uint8 <a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>;</div>
<div class="line"><a name="l00047"></a><span class="lineno"><a class="line" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92"> 47</a></span>  Uint8 <a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>;</div>
<div class="line"><a name="l00048"></a><span class="lineno"><a class="line" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956"> 48</a></span>  Uint8 <a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> } <a class="code" href="_s_d_l2__rotozoom_8c.html#ac91ff95383d3a6c0df046a42e23baf04">tColorRGBA</a>;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div>
<div class="line"><a name="l00054"></a><span class="lineno"><a class="line" href="structt_color_y.html"> 54</a></span> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structt_color_y.html">tColorY</a> {</div>
<div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="structt_color_y.html#ace61c93d341a0b154df0e9923558a537"> 55</a></span>  Uint8 <a class="code" href="structt_color_y.html#ace61c93d341a0b154df0e9923558a537">y</a>;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> } <a class="code" href="_s_d_l2__rotozoom_8c.html#a9db27e25d1a6e93c64eb768007dcf3da">tColorY</a>;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div>
<div class="line"><a name="l00061"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8c.html#a6480bf180457e531eba02b6a66d84dad"> 61</a></span> <span class="preprocessor">#define MAX(a,b) (((a) > (b)) ? (a) : (b))</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
<div class="line"><a name="l00073"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb"> 73</a></span> <span class="preprocessor">#define GUARD_ROWS (2)</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> </div>
<div class="line"><a name="l00078"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9"> 78</a></span> <span class="preprocessor">#define VALUE_LIMIT 0.001</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div>
<div class="line"><a name="l00083"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce"> 83</a></span> Uint32 <a class="code" href="_s_d_l2__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce">_colorkey</a>(SDL_Surface *src)</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> {</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  Uint32 key = 0; </div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  SDL_GetColorKey(src, &key);</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">return</span> key;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> }</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div>
<div class="line"><a name="l00106"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8c.html#ac1bde824f44ae9a76930e9782b783512"> 106</a></span> <span class="keywordtype">int</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#ac1bde824f44ae9a76930e9782b783512">_shrinkSurfaceRGBA</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> factorx, <span class="keywordtype">int</span> factory)</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> {</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordtype">int</span> x, y, dx, dy, dgap, ra, ga, ba, aa;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordtype">int</span> n_average;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *sp, *osp, *oosp;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *dp;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"> * Averaging integer shrink</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="comment">/* Precalculate division factor */</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  n_average = factorx*factory;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> </div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> * Scan destination</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  sp = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *) src->pixels;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  </div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  dp = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *) dst->pixels;</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  dgap = dst->pitch - dst->w * 4;</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  osp=sp;</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> </div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="comment">/* Trace out source box and accumulate */</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  oosp=sp;</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  ra=ga=ba=aa=0;</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">for</span> (dy=0; dy < factory; dy++) {</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordflow">for</span> (dx=0; dx < factorx; dx++) {</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  ra += sp-><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>;</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  ga += sp-><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  ba += sp-><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>;</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  aa += sp-><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>;</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> </div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  sp++;</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  } </div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="comment">/* src dx loop */</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  sp = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *)((Uint8*)sp + (src->pitch - 4*factorx)); <span class="comment">// next y</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  }</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="comment">/* src dy loop */</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> </div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="comment">/* next box-x */</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  sp = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *)((Uint8*)oosp + 4*factorx);</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> </div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="comment">/* Store result in destination */</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  dp-><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> = ra/n_average;</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  dp-><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> = ga/n_average;</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  dp-><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> = ba/n_average;</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  dp-><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> = aa/n_average;</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="comment"> * Advance destination pointer </span></div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  dp++;</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  } </div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="comment">/* dst x loop */</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> </div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="comment">/* next box-y */</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  sp = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *)((Uint8*)osp + src->pitch*factory);</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> </div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> <span class="comment"> * Advance destination pointers </span></div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  dp = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *) ((Uint8 *) dp + dgap);</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  } </div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="comment">/* dst y loop */</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> </div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">return</span> (0);</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> }</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> </div>
<div class="line"><a name="l00194"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8c.html#aadb38a61ab6727e5fd621b63418399be"> 194</a></span> <span class="keywordtype">int</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#aadb38a61ab6727e5fd621b63418399be">_shrinkSurfaceY</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> factorx, <span class="keywordtype">int</span> factory)</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> {</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="keywordtype">int</span> x, y, dx, dy, dgap, a;</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keywordtype">int</span> n_average;</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  Uint8 *sp, *osp, *oosp;</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  Uint8 *dp;</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> </div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="comment"> * Averaging integer shrink</span></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> </div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="comment">/* Precalculate division factor */</span></div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  n_average = factorx*factory;</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> </div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> <span class="comment"> * Scan destination</span></div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  sp = (Uint8 *) src->pixels;</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> </div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  dp = (Uint8 *) dst->pixels;</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  dgap = dst->pitch - dst->w;</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> </div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) { </div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> </div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  osp=sp;</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> </div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="comment">/* Trace out source box and accumulate */</span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  oosp=sp;</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  a=0;</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="keywordflow">for</span> (dy=0; dy < factory; dy++) {</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="keywordflow">for</span> (dx=0; dx < factorx; dx++) {</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  a += (*sp);</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="comment">/* next x */</span> </div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  sp++;</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  } </div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="comment">/* end src dx loop */</span> </div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="comment">/* next y */</span></div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  sp = (Uint8 *)((Uint8*)sp + (src->pitch - factorx)); </div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  } </div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <span class="comment">/* end src dy loop */</span></div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> </div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="comment">/* next box-x */</span></div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  sp = (Uint8 *)((Uint8*)oosp + factorx);</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> </div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="comment">/* Store result in destination */</span></div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  *dp = a/n_average;</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> </div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span> <span class="comment"> * Advance destination pointer </span></div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  dp++;</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  } </div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="comment">/* end dst x loop */</span></div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> </div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="comment">/* next box-y */</span></div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  sp = (Uint8 *)((Uint8*)osp + src->pitch*factory);</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> </div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> <span class="comment"> * Advance destination pointers </span></div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  dp = (Uint8 *)((Uint8 *)dp + dgap);</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  } </div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="comment">/* end dst y loop */</span></div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> </div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keywordflow">return</span> (0);</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> }</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> </div>
<div class="line"><a name="l00277"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8c.html#a9898b12bb565c4075c2da4db4891fd81"> 277</a></span> <span class="keywordtype">int</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#a9898b12bb565c4075c2da4db4891fd81">_zoomSurfaceRGBA</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> flipx, <span class="keywordtype">int</span> flipy, <span class="keywordtype">int</span> smooth)</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span> {</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keywordtype">int</span> x, y, sx, sy, ssx, ssy, *sax, *say, *csax, *csay, *salast, csx, csy, ex, ey, cx, cy, sstep, sstepx, sstepy;</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *c00, *c01, *c10, *c11;</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *sp, *csp, *dp;</div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="keywordtype">int</span> spixelgap, spixelw, spixelh, dgap, t1, t2;</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span> </div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span> <span class="comment"> * Allocate memory for row/column increments </span></div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="keywordflow">if</span> ((sax = (<span class="keywordtype">int</span> *) malloc((dst->w + 1) * <span class="keyword">sizeof</span>(Uint32))) == NULL) {</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="keywordflow">return</span> (-1);</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  }</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  <span class="keywordflow">if</span> ((say = (<span class="keywordtype">int</span> *) malloc((dst->h + 1) * <span class="keyword">sizeof</span>(Uint32))) == NULL) {</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  free(sax);</div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="keywordflow">return</span> (-1);</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  }</div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span> </div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span> <span class="comment"> * Precalculate row increments </span></div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  spixelw = (src->w - 1);</div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  spixelh = (src->h - 1);</div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="keywordflow">if</span> (smooth) {</div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  sx = (int) (65536.0 * (<span class="keywordtype">float</span>) spixelw / (float) (dst->w - 1));</div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  sy = (int) (65536.0 * (<span class="keywordtype">float</span>) spixelh / (float) (dst->h - 1));</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  sx = (int) (65536.0 * (<span class="keywordtype">float</span>) (src->w) / (<span class="keywordtype">float</span>) (dst->w));</div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  sy = (int) (65536.0 * (<span class="keywordtype">float</span>) (src->h) / (<span class="keywordtype">float</span>) (dst->h));</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  }</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> </div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  <span class="comment">/* Maximum scaled source size */</span></div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  ssx = (src->w << 16) - 1;</div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  ssy = (src->h << 16) - 1;</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span> </div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  <span class="comment">/* Precalculate horizontal row increments */</span></div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  csx = 0;</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  csax = sax;</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="keywordflow">for</span> (x = 0; x <= dst->w; x++) {</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  *csax = csx;</div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  csax++;</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  csx += sx;</div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> </div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  <span class="comment">/* Guard from overflows */</span></div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  <span class="keywordflow">if</span> (csx > ssx) { </div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  csx = ssx; </div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  }</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  }</div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span> </div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  <span class="comment">/* Precalculate vertical row increments */</span></div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  csy = 0;</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  csay = say;</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  <span class="keywordflow">for</span> (y = 0; y <= dst->h; y++) {</div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  *csay = csy;</div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  csay++;</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  csy += sy;</div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span> </div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  <span class="comment">/* Guard from overflows */</span></div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  <span class="keywordflow">if</span> (csy > ssy) {</div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  csy = ssy;</div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  }</div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  }</div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span> </div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  sp = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *) src->pixels;</div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  dp = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *) dst->pixels;</div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  dgap = dst->pitch - dst->w * 4;</div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  spixelgap = src->pitch/4;</div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span> </div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  <span class="keywordflow">if</span> (flipx) sp += spixelw;</div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  <span class="keywordflow">if</span> (flipy) sp += (spixelgap * spixelh);</div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span> </div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span> <span class="comment"> * Switch between interpolating and non-interpolating code </span></div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  <span class="keywordflow">if</span> (smooth) {</div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span> </div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span> <span class="comment"> * Interpolating Zoom </span></div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  csay = say;</div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  csp = sp;</div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  csax = sax;</div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {</div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span> <span class="comment"> * Setup color source pointers </span></div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  ex = (*csax & 0xffff);</div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  ey = (*csay & 0xffff);</div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  cx = (*csax >> 16);</div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  cy = (*csay >> 16);</div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  sstepx = cx < spixelw;</div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  sstepy = cy < spixelh;</div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  c00 = sp;</div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  c01 = sp;</div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  c10 = sp;</div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  <span class="keywordflow">if</span> (sstepy) {</div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  <span class="keywordflow">if</span> (flipy) {</div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  c10 -= spixelgap;</div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  c10 += spixelgap;</div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  }</div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  }</div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  c11 = c10;</div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  <span class="keywordflow">if</span> (sstepx) {</div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  <span class="keywordflow">if</span> (flipx) {</div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  c01--;</div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  c11--;</div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  c01++;</div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  c11++;</div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  }</div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  }</div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span> </div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span> <span class="comment"> * Draw and interpolate colors </span></div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  t1 = ((((c01-><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> - c00-><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) * ex) >> 16) + c00-><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) & 0xff;</div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  t2 = ((((c11-><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> - c10-><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) * ex) >> 16) + c10-><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) & 0xff;</div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  dp-><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> = (((t2 - t1) * ey) >> 16) + t1;</div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  t1 = ((((c01-><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> - c00-><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) * ex) >> 16) + c00-><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) & 0xff;</div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  t2 = ((((c11-><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> - c10-><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) * ex) >> 16) + c10-><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) & 0xff;</div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  dp-><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> = (((t2 - t1) * ey) >> 16) + t1;</div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  t1 = ((((c01-><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> - c00-><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) * ex) >> 16) + c00-><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) & 0xff;</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  t2 = ((((c11-><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> - c10-><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) * ex) >> 16) + c10-><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) & 0xff;</div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  dp-><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> = (((t2 - t1) * ey) >> 16) + t1;</div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  t1 = ((((c01-><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> - c00-><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) * ex) >> 16) + c00-><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) & 0xff;</div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  t2 = ((((c11-><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> - c10-><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) * ex) >> 16) + c10-><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) & 0xff;</div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  dp-><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> = (((t2 - t1) * ey) >> 16) + t1; </div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span> <span class="comment"> * Advance source pointer x</span></div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  salast = csax;</div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span>  csax++; </div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  sstep = (*csax >> 16) - (*salast >> 16);</div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  <span class="keywordflow">if</span> (flipx) {</div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  sp -= sstep;</div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  sp += sstep;</div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  }</div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span> </div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span> <span class="comment"> * Advance destination pointer x</span></div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  dp++;</div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  }</div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span> <span class="comment"> * Advance source pointer y</span></div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  salast = csay;</div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  csay++;</div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  sstep = (*csay >> 16) - (*salast >> 16);</div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  sstep *= spixelgap;</div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  <span class="keywordflow">if</span> (flipy) { </div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  sp = csp - sstep;</div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  sp = csp + sstep;</div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  }</div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span> </div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span> <span class="comment"> * Advance destination pointer y</span></div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  dp = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *) ((Uint8 *) dp + dgap);</div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  }</div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span> <span class="comment"> * Non-Interpolating Zoom </span></div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span> <span class="comment"> */</span> </div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  csay = say;</div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span>  <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {</div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  csp = sp;</div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  csax = sax;</div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span>  <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {</div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span> <span class="comment"> * Draw </span></div>
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  *dp = *sp;</div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span> </div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span> <span class="comment"> * Advance source pointer x</span></div>
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  salast = csax;</div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  csax++; </div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  sstep = (*csax >> 16) - (*salast >> 16);</div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  <span class="keywordflow">if</span> (flipx) sstep = -sstep;</div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  sp += sstep;</div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span> </div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span> <span class="comment"> * Advance destination pointer x</span></div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  dp++;</div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  }</div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span> <span class="comment"> * Advance source pointer y</span></div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span>  salast = csay;</div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  csay++;</div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  sstep = (*csay >> 16) - (*salast >> 16);</div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  sstep *= spixelgap;</div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  <span class="keywordflow">if</span> (flipy) sstep = -sstep; </div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span>  sp = csp + sstep;</div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span> </div>
<div class="line"><a name="l00479"></a><span class="lineno"> 479</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00480"></a><span class="lineno"> 480</span> <span class="comment"> * Advance destination pointer y</span></div>
<div class="line"><a name="l00481"></a><span class="lineno"> 481</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00482"></a><span class="lineno"> 482</span>  dp = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *) ((Uint8 *) dp + dgap);</div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  }</div>
<div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  }</div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span> </div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span> <span class="comment"> * Remove temp arrays </span></div>
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  free(sax);</div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span>  free(say);</div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span> </div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  <span class="keywordflow">return</span> (0);</div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span> }</div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span> </div>
<div class="line"><a name="l00510"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8c.html#acfeb5a322cbb575f105f1762d9d21c29"> 510</a></span> <span class="keywordtype">int</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#acfeb5a322cbb575f105f1762d9d21c29">_zoomSurfaceY</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> flipx, <span class="keywordtype">int</span> flipy)</div>
<div class="line"><a name="l00511"></a><span class="lineno"> 511</span> {</div>
<div class="line"><a name="l00512"></a><span class="lineno"> 512</span>  <span class="keywordtype">int</span> x, y;</div>
<div class="line"><a name="l00513"></a><span class="lineno"> 513</span>  Uint32 *sax, *say, *csax, *csay;</div>
<div class="line"><a name="l00514"></a><span class="lineno"> 514</span>  <span class="keywordtype">int</span> csx, csy;</div>
<div class="line"><a name="l00515"></a><span class="lineno"> 515</span>  Uint8 *sp, *dp, *csp;</div>
<div class="line"><a name="l00516"></a><span class="lineno"> 516</span>  <span class="keywordtype">int</span> dgap;</div>
<div class="line"><a name="l00517"></a><span class="lineno"> 517</span> </div>
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00519"></a><span class="lineno"> 519</span> <span class="comment"> * Allocate memory for row increments </span></div>
<div class="line"><a name="l00520"></a><span class="lineno"> 520</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00521"></a><span class="lineno"> 521</span>  <span class="keywordflow">if</span> ((sax = (Uint32 *) malloc((dst->w + 1) * <span class="keyword">sizeof</span>(Uint32))) == NULL) {</div>
<div class="line"><a name="l00522"></a><span class="lineno"> 522</span>  <span class="keywordflow">return</span> (-1);</div>
<div class="line"><a name="l00523"></a><span class="lineno"> 523</span>  }</div>
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span>  <span class="keywordflow">if</span> ((say = (Uint32 *) malloc((dst->h + 1) * <span class="keyword">sizeof</span>(Uint32))) == NULL) {</div>
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span>  free(sax);</div>
<div class="line"><a name="l00526"></a><span class="lineno"> 526</span>  <span class="keywordflow">return</span> (-1);</div>
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span>  }</div>
<div class="line"><a name="l00528"></a><span class="lineno"> 528</span> </div>
<div class="line"><a name="l00529"></a><span class="lineno"> 529</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00530"></a><span class="lineno"> 530</span> <span class="comment"> * Pointer setup </span></div>
<div class="line"><a name="l00531"></a><span class="lineno"> 531</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00532"></a><span class="lineno"> 532</span>  sp = csp = (Uint8 *) src->pixels;</div>
<div class="line"><a name="l00533"></a><span class="lineno"> 533</span>  dp = (Uint8 *) dst->pixels;</div>
<div class="line"><a name="l00534"></a><span class="lineno"> 534</span>  dgap = dst->pitch - dst->w;</div>
<div class="line"><a name="l00535"></a><span class="lineno"> 535</span> </div>
<div class="line"><a name="l00536"></a><span class="lineno"> 536</span>  <span class="keywordflow">if</span> (flipx) csp += (src->w-1);</div>
<div class="line"><a name="l00537"></a><span class="lineno"> 537</span>  <span class="keywordflow">if</span> (flipy) csp = ( (Uint8*)csp + src->pitch*(src->h-1) );</div>
<div class="line"><a name="l00538"></a><span class="lineno"> 538</span> </div>
<div class="line"><a name="l00539"></a><span class="lineno"> 539</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00540"></a><span class="lineno"> 540</span> <span class="comment"> * Precalculate row increments </span></div>
<div class="line"><a name="l00541"></a><span class="lineno"> 541</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00542"></a><span class="lineno"> 542</span>  csx = 0;</div>
<div class="line"><a name="l00543"></a><span class="lineno"> 543</span>  csax = sax;</div>
<div class="line"><a name="l00544"></a><span class="lineno"> 544</span>  <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {</div>
<div class="line"><a name="l00545"></a><span class="lineno"> 545</span>  csx += src->w;</div>
<div class="line"><a name="l00546"></a><span class="lineno"> 546</span>  *csax = 0;</div>
<div class="line"><a name="l00547"></a><span class="lineno"> 547</span>  <span class="keywordflow">while</span> (csx >= dst->w) {</div>
<div class="line"><a name="l00548"></a><span class="lineno"> 548</span>  csx -= dst->w;</div>
<div class="line"><a name="l00549"></a><span class="lineno"> 549</span>  (*csax)++;</div>
<div class="line"><a name="l00550"></a><span class="lineno"> 550</span>  }</div>
<div class="line"><a name="l00551"></a><span class="lineno"> 551</span>  (*csax) = (*csax) * (flipx ? -1 : 1);</div>
<div class="line"><a name="l00552"></a><span class="lineno"> 552</span>  csax++;</div>
<div class="line"><a name="l00553"></a><span class="lineno"> 553</span>  }</div>
<div class="line"><a name="l00554"></a><span class="lineno"> 554</span>  csy = 0;</div>
<div class="line"><a name="l00555"></a><span class="lineno"> 555</span>  csay = say;</div>
<div class="line"><a name="l00556"></a><span class="lineno"> 556</span>  <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {</div>
<div class="line"><a name="l00557"></a><span class="lineno"> 557</span>  csy += src->h;</div>
<div class="line"><a name="l00558"></a><span class="lineno"> 558</span>  *csay = 0;</div>
<div class="line"><a name="l00559"></a><span class="lineno"> 559</span>  <span class="keywordflow">while</span> (csy >= dst->h) {</div>
<div class="line"><a name="l00560"></a><span class="lineno"> 560</span>  csy -= dst->h;</div>
<div class="line"><a name="l00561"></a><span class="lineno"> 561</span>  (*csay)++;</div>
<div class="line"><a name="l00562"></a><span class="lineno"> 562</span>  }</div>
<div class="line"><a name="l00563"></a><span class="lineno"> 563</span>  (*csay) = (*csay) * (flipy ? -1 : 1);</div>
<div class="line"><a name="l00564"></a><span class="lineno"> 564</span>  csay++;</div>
<div class="line"><a name="l00565"></a><span class="lineno"> 565</span>  }</div>
<div class="line"><a name="l00566"></a><span class="lineno"> 566</span> </div>
<div class="line"><a name="l00567"></a><span class="lineno"> 567</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00568"></a><span class="lineno"> 568</span> <span class="comment"> * Draw </span></div>
<div class="line"><a name="l00569"></a><span class="lineno"> 569</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00570"></a><span class="lineno"> 570</span>  csay = say;</div>
<div class="line"><a name="l00571"></a><span class="lineno"> 571</span>  <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {</div>
<div class="line"><a name="l00572"></a><span class="lineno"> 572</span>  csax = sax;</div>
<div class="line"><a name="l00573"></a><span class="lineno"> 573</span>  sp = csp;</div>
<div class="line"><a name="l00574"></a><span class="lineno"> 574</span>  <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {</div>
<div class="line"><a name="l00575"></a><span class="lineno"> 575</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00576"></a><span class="lineno"> 576</span> <span class="comment"> * Draw </span></div>
<div class="line"><a name="l00577"></a><span class="lineno"> 577</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00578"></a><span class="lineno"> 578</span>  *dp = *sp;</div>
<div class="line"><a name="l00579"></a><span class="lineno"> 579</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00580"></a><span class="lineno"> 580</span> <span class="comment"> * Advance source pointers </span></div>
<div class="line"><a name="l00581"></a><span class="lineno"> 581</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00582"></a><span class="lineno"> 582</span>  sp += (*csax);</div>
<div class="line"><a name="l00583"></a><span class="lineno"> 583</span>  csax++;</div>
<div class="line"><a name="l00584"></a><span class="lineno"> 584</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00585"></a><span class="lineno"> 585</span> <span class="comment"> * Advance destination pointer </span></div>
<div class="line"><a name="l00586"></a><span class="lineno"> 586</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00587"></a><span class="lineno"> 587</span>  dp++;</div>
<div class="line"><a name="l00588"></a><span class="lineno"> 588</span>  }</div>
<div class="line"><a name="l00589"></a><span class="lineno"> 589</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00590"></a><span class="lineno"> 590</span> <span class="comment"> * Advance source pointer (for row) </span></div>
<div class="line"><a name="l00591"></a><span class="lineno"> 591</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00592"></a><span class="lineno"> 592</span>  csp += ((*csay) * src->pitch);</div>
<div class="line"><a name="l00593"></a><span class="lineno"> 593</span>  csay++;</div>
<div class="line"><a name="l00594"></a><span class="lineno"> 594</span> </div>
<div class="line"><a name="l00595"></a><span class="lineno"> 595</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00596"></a><span class="lineno"> 596</span> <span class="comment"> * Advance destination pointers </span></div>
<div class="line"><a name="l00597"></a><span class="lineno"> 597</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00598"></a><span class="lineno"> 598</span>  dp += dgap;</div>
<div class="line"><a name="l00599"></a><span class="lineno"> 599</span>  }</div>
<div class="line"><a name="l00600"></a><span class="lineno"> 600</span> </div>
<div class="line"><a name="l00601"></a><span class="lineno"> 601</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00602"></a><span class="lineno"> 602</span> <span class="comment"> * Remove temp arrays </span></div>
<div class="line"><a name="l00603"></a><span class="lineno"> 603</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00604"></a><span class="lineno"> 604</span>  free(sax);</div>
<div class="line"><a name="l00605"></a><span class="lineno"> 605</span>  free(say);</div>
<div class="line"><a name="l00606"></a><span class="lineno"> 606</span> </div>
<div class="line"><a name="l00607"></a><span class="lineno"> 607</span>  <span class="keywordflow">return</span> (0);</div>
<div class="line"><a name="l00608"></a><span class="lineno"> 608</span> }</div>
<div class="line"><a name="l00609"></a><span class="lineno"> 609</span> </div>
<div class="line"><a name="l00629"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8c.html#aae634e7b5e6ec1622fec361ecbd0d1b7"> 629</a></span> <span class="keywordtype">void</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#aae634e7b5e6ec1622fec361ecbd0d1b7">_transformSurfaceRGBA</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> cx, <span class="keywordtype">int</span> cy, <span class="keywordtype">int</span> isin, <span class="keywordtype">int</span> icos, <span class="keywordtype">int</span> flipx, <span class="keywordtype">int</span> flipy, <span class="keywordtype">int</span> smooth)</div>
<div class="line"><a name="l00630"></a><span class="lineno"> 630</span> {</div>
<div class="line"><a name="l00631"></a><span class="lineno"> 631</span>  <span class="keywordtype">int</span> x, y, t1, t2, dx, dy, xd, yd, sdx, sdy, ax, ay, ex, ey, sw, sh;</div>
<div class="line"><a name="l00632"></a><span class="lineno"> 632</span>  <a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> c00, c01, c10, c11, cswap;</div>
<div class="line"><a name="l00633"></a><span class="lineno"> 633</span>  <a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *pc, *sp;</div>
<div class="line"><a name="l00634"></a><span class="lineno"> 634</span>  <span class="keywordtype">int</span> gap;</div>
<div class="line"><a name="l00635"></a><span class="lineno"> 635</span> </div>
<div class="line"><a name="l00636"></a><span class="lineno"> 636</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00637"></a><span class="lineno"> 637</span> <span class="comment"> * Variable setup </span></div>
<div class="line"><a name="l00638"></a><span class="lineno"> 638</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00639"></a><span class="lineno"> 639</span>  xd = ((src->w - dst->w) << 15);</div>
<div class="line"><a name="l00640"></a><span class="lineno"> 640</span>  yd = ((src->h - dst->h) << 15);</div>
<div class="line"><a name="l00641"></a><span class="lineno"> 641</span>  ax = (cx << 16) - (icos * cx);</div>
<div class="line"><a name="l00642"></a><span class="lineno"> 642</span>  ay = (cy << 16) - (isin * cx);</div>
<div class="line"><a name="l00643"></a><span class="lineno"> 643</span>  sw = src->w - 1;</div>
<div class="line"><a name="l00644"></a><span class="lineno"> 644</span>  sh = src->h - 1;</div>
<div class="line"><a name="l00645"></a><span class="lineno"> 645</span>  pc = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a>*) dst->pixels;</div>
<div class="line"><a name="l00646"></a><span class="lineno"> 646</span>  gap = dst->pitch - dst->w * 4;</div>
<div class="line"><a name="l00647"></a><span class="lineno"> 647</span> </div>
<div class="line"><a name="l00648"></a><span class="lineno"> 648</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00649"></a><span class="lineno"> 649</span> <span class="comment"> * Switch between interpolating and non-interpolating code </span></div>
<div class="line"><a name="l00650"></a><span class="lineno"> 650</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00651"></a><span class="lineno"> 651</span>  if (smooth) {</div>
<div class="line"><a name="l00652"></a><span class="lineno"> 652</span>  <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {</div>
<div class="line"><a name="l00653"></a><span class="lineno"> 653</span>  dy = cy - y;</div>
<div class="line"><a name="l00654"></a><span class="lineno"> 654</span>  sdx = (ax + (isin * dy)) + xd;</div>
<div class="line"><a name="l00655"></a><span class="lineno"> 655</span>  sdy = (ay - (icos * dy)) + yd;</div>
<div class="line"><a name="l00656"></a><span class="lineno"> 656</span>  <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {</div>
<div class="line"><a name="l00657"></a><span class="lineno"> 657</span>  dx = (sdx >> 16);</div>
<div class="line"><a name="l00658"></a><span class="lineno"> 658</span>  dy = (sdy >> 16);</div>
<div class="line"><a name="l00659"></a><span class="lineno"> 659</span>  <span class="keywordflow">if</span> (flipx) dx = sw - dx;</div>
<div class="line"><a name="l00660"></a><span class="lineno"> 660</span>  <span class="keywordflow">if</span> (flipy) dy = sh - dy;</div>
<div class="line"><a name="l00661"></a><span class="lineno"> 661</span>  <span class="keywordflow">if</span> ((dx > -1) && (dy > -1) && (dx < (src->w-1)) && (dy < (src->h-1))) {</div>
<div class="line"><a name="l00662"></a><span class="lineno"> 662</span>  sp = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *)src->pixels;;</div>
<div class="line"><a name="l00663"></a><span class="lineno"> 663</span>  sp += ((src->pitch/4) * dy);</div>
<div class="line"><a name="l00664"></a><span class="lineno"> 664</span>  sp += dx;</div>
<div class="line"><a name="l00665"></a><span class="lineno"> 665</span>  c00 = *sp;</div>
<div class="line"><a name="l00666"></a><span class="lineno"> 666</span>  sp += 1;</div>
<div class="line"><a name="l00667"></a><span class="lineno"> 667</span>  c01 = *sp;</div>
<div class="line"><a name="l00668"></a><span class="lineno"> 668</span>  sp += (src->pitch/4);</div>
<div class="line"><a name="l00669"></a><span class="lineno"> 669</span>  c11 = *sp;</div>
<div class="line"><a name="l00670"></a><span class="lineno"> 670</span>  sp -= 1;</div>
<div class="line"><a name="l00671"></a><span class="lineno"> 671</span>  c10 = *sp;</div>
<div class="line"><a name="l00672"></a><span class="lineno"> 672</span>  <span class="keywordflow">if</span> (flipx) {</div>
<div class="line"><a name="l00673"></a><span class="lineno"> 673</span>  cswap = c00; c00=c01; c01=cswap;</div>
<div class="line"><a name="l00674"></a><span class="lineno"> 674</span>  cswap = c10; c10=c11; c11=cswap;</div>
<div class="line"><a name="l00675"></a><span class="lineno"> 675</span>  }</div>
<div class="line"><a name="l00676"></a><span class="lineno"> 676</span>  <span class="keywordflow">if</span> (flipy) {</div>
<div class="line"><a name="l00677"></a><span class="lineno"> 677</span>  cswap = c00; c00=c10; c10=cswap;</div>
<div class="line"><a name="l00678"></a><span class="lineno"> 678</span>  cswap = c01; c01=c11; c11=cswap;</div>
<div class="line"><a name="l00679"></a><span class="lineno"> 679</span>  }</div>
<div class="line"><a name="l00680"></a><span class="lineno"> 680</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00681"></a><span class="lineno"> 681</span> <span class="comment"> * Interpolate colors </span></div>
<div class="line"><a name="l00682"></a><span class="lineno"> 682</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00683"></a><span class="lineno"> 683</span>  ex = (sdx & 0xffff);</div>
<div class="line"><a name="l00684"></a><span class="lineno"> 684</span>  ey = (sdy & 0xffff);</div>
<div class="line"><a name="l00685"></a><span class="lineno"> 685</span>  t1 = ((((c01.<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> - c00.<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) * ex) >> 16) + c00.<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) & 0xff;</div>
<div class="line"><a name="l00686"></a><span class="lineno"> 686</span>  t2 = ((((c11.<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> - c10.<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) * ex) >> 16) + c10.<a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>) & 0xff;</div>
<div class="line"><a name="l00687"></a><span class="lineno"> 687</span>  pc-><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> = (((t2 - t1) * ey) >> 16) + t1;</div>
<div class="line"><a name="l00688"></a><span class="lineno"> 688</span>  t1 = ((((c01.<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> - c00.<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) * ex) >> 16) + c00.<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) & 0xff;</div>
<div class="line"><a name="l00689"></a><span class="lineno"> 689</span>  t2 = ((((c11.<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> - c10.<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) * ex) >> 16) + c10.<a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>) & 0xff;</div>
<div class="line"><a name="l00690"></a><span class="lineno"> 690</span>  pc-><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> = (((t2 - t1) * ey) >> 16) + t1;</div>
<div class="line"><a name="l00691"></a><span class="lineno"> 691</span>  t1 = ((((c01.<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> - c00.<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) * ex) >> 16) + c00.<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) & 0xff;</div>
<div class="line"><a name="l00692"></a><span class="lineno"> 692</span>  t2 = ((((c11.<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> - c10.<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) * ex) >> 16) + c10.<a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>) & 0xff;</div>
<div class="line"><a name="l00693"></a><span class="lineno"> 693</span>  pc-><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> = (((t2 - t1) * ey) >> 16) + t1;</div>
<div class="line"><a name="l00694"></a><span class="lineno"> 694</span>  t1 = ((((c01.<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> - c00.<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) * ex) >> 16) + c00.<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) & 0xff;</div>
<div class="line"><a name="l00695"></a><span class="lineno"> 695</span>  t2 = ((((c11.<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> - c10.<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) * ex) >> 16) + c10.<a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>) & 0xff;</div>
<div class="line"><a name="l00696"></a><span class="lineno"> 696</span>  pc-><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> = (((t2 - t1) * ey) >> 16) + t1;</div>
<div class="line"><a name="l00697"></a><span class="lineno"> 697</span>  }</div>
<div class="line"><a name="l00698"></a><span class="lineno"> 698</span>  sdx += icos;</div>
<div class="line"><a name="l00699"></a><span class="lineno"> 699</span>  sdy += isin;</div>
<div class="line"><a name="l00700"></a><span class="lineno"> 700</span>  pc++;</div>
<div class="line"><a name="l00701"></a><span class="lineno"> 701</span>  }</div>
<div class="line"><a name="l00702"></a><span class="lineno"> 702</span>  pc = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *) ((Uint8 *) pc + gap);</div>
<div class="line"><a name="l00703"></a><span class="lineno"> 703</span>  }</div>
<div class="line"><a name="l00704"></a><span class="lineno"> 704</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00705"></a><span class="lineno"> 705</span>  <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {</div>
<div class="line"><a name="l00706"></a><span class="lineno"> 706</span>  dy = cy - y;</div>
<div class="line"><a name="l00707"></a><span class="lineno"> 707</span>  sdx = (ax + (isin * dy)) + xd;</div>
<div class="line"><a name="l00708"></a><span class="lineno"> 708</span>  sdy = (ay - (icos * dy)) + yd;</div>
<div class="line"><a name="l00709"></a><span class="lineno"> 709</span>  <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {</div>
<div class="line"><a name="l00710"></a><span class="lineno"> 710</span>  dx = (short) (sdx >> 16);</div>
<div class="line"><a name="l00711"></a><span class="lineno"> 711</span>  dy = (short) (sdy >> 16);</div>
<div class="line"><a name="l00712"></a><span class="lineno"> 712</span>  <span class="keywordflow">if</span> (flipx) dx = (src->w-1)-dx;</div>
<div class="line"><a name="l00713"></a><span class="lineno"> 713</span>  <span class="keywordflow">if</span> (flipy) dy = (src->h-1)-dy;</div>
<div class="line"><a name="l00714"></a><span class="lineno"> 714</span>  <span class="keywordflow">if</span> ((dx >= 0) && (dy >= 0) && (dx < src->w) && (dy < src->h)) {</div>
<div class="line"><a name="l00715"></a><span class="lineno"> 715</span>  sp = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *) ((Uint8 *) src->pixels + src->pitch * dy);</div>
<div class="line"><a name="l00716"></a><span class="lineno"> 716</span>  sp += dx;</div>
<div class="line"><a name="l00717"></a><span class="lineno"> 717</span>  *pc = *sp;</div>
<div class="line"><a name="l00718"></a><span class="lineno"> 718</span>  }</div>
<div class="line"><a name="l00719"></a><span class="lineno"> 719</span>  sdx += icos;</div>
<div class="line"><a name="l00720"></a><span class="lineno"> 720</span>  sdy += isin;</div>
<div class="line"><a name="l00721"></a><span class="lineno"> 721</span>  pc++;</div>
<div class="line"><a name="l00722"></a><span class="lineno"> 722</span>  }</div>
<div class="line"><a name="l00723"></a><span class="lineno"> 723</span>  pc = (<a class="code" href="structt_color_r_g_b_a.html">tColorRGBA</a> *) ((Uint8 *) pc + gap);</div>
<div class="line"><a name="l00724"></a><span class="lineno"> 724</span>  }</div>
<div class="line"><a name="l00725"></a><span class="lineno"> 725</span>  }</div>
<div class="line"><a name="l00726"></a><span class="lineno"> 726</span> }</div>
<div class="line"><a name="l00727"></a><span class="lineno"> 727</span> </div>
<div class="line"><a name="l00746"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8c.html#a126e3b96b22cc18e78e33cc1f8eb6c3c"> 746</a></span> <span class="keywordtype">void</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#a126e3b96b22cc18e78e33cc1f8eb6c3c">transformSurfaceY</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> cx, <span class="keywordtype">int</span> cy, <span class="keywordtype">int</span> isin, <span class="keywordtype">int</span> icos, <span class="keywordtype">int</span> flipx, <span class="keywordtype">int</span> flipy)</div>
<div class="line"><a name="l00747"></a><span class="lineno"> 747</span> {</div>
<div class="line"><a name="l00748"></a><span class="lineno"> 748</span>  <span class="keywordtype">int</span> x, y, dx, dy, xd, yd, sdx, sdy, ax, ay;</div>
<div class="line"><a name="l00749"></a><span class="lineno"> 749</span>  <a class="code" href="structt_color_y.html">tColorY</a> *pc, *sp;</div>
<div class="line"><a name="l00750"></a><span class="lineno"> 750</span>  <span class="keywordtype">int</span> gap;</div>
<div class="line"><a name="l00751"></a><span class="lineno"> 751</span> </div>
<div class="line"><a name="l00752"></a><span class="lineno"> 752</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00753"></a><span class="lineno"> 753</span> <span class="comment"> * Variable setup </span></div>
<div class="line"><a name="l00754"></a><span class="lineno"> 754</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00755"></a><span class="lineno"> 755</span>  xd = ((src->w - dst->w) << 15);</div>
<div class="line"><a name="l00756"></a><span class="lineno"> 756</span>  yd = ((src->h - dst->h) << 15);</div>
<div class="line"><a name="l00757"></a><span class="lineno"> 757</span>  ax = (cx << 16) - (icos * cx);</div>
<div class="line"><a name="l00758"></a><span class="lineno"> 758</span>  ay = (cy << 16) - (isin * cx);</div>
<div class="line"><a name="l00759"></a><span class="lineno"> 759</span>  pc = (<a class="code" href="structt_color_y.html">tColorY</a>*) dst->pixels;</div>
<div class="line"><a name="l00760"></a><span class="lineno"> 760</span>  gap = dst->pitch - dst->w;</div>
<div class="line"><a name="l00761"></a><span class="lineno"> 761</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00762"></a><span class="lineno"> 762</span> <span class="comment"> * Clear surface to colorkey </span></div>
<div class="line"><a name="l00763"></a><span class="lineno"> 763</span> <span class="comment"> */</span> </div>
<div class="line"><a name="l00764"></a><span class="lineno"> 764</span>  memset(pc, (<span class="keywordtype">int</span>)(<a class="code" href="_s_d_l2__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce">_colorkey</a>(src) & 0xff), dst->pitch * dst->h);</div>
<div class="line"><a name="l00765"></a><span class="lineno"> 765</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00766"></a><span class="lineno"> 766</span> <span class="comment"> * Iterate through destination surface </span></div>
<div class="line"><a name="l00767"></a><span class="lineno"> 767</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00768"></a><span class="lineno"> 768</span>  <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {</div>
<div class="line"><a name="l00769"></a><span class="lineno"> 769</span>  dy = cy - y;</div>
<div class="line"><a name="l00770"></a><span class="lineno"> 770</span>  sdx = (ax + (isin * dy)) + xd;</div>
<div class="line"><a name="l00771"></a><span class="lineno"> 771</span>  sdy = (ay - (icos * dy)) + yd;</div>
<div class="line"><a name="l00772"></a><span class="lineno"> 772</span>  <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {</div>
<div class="line"><a name="l00773"></a><span class="lineno"> 773</span>  dx = (short) (sdx >> 16);</div>
<div class="line"><a name="l00774"></a><span class="lineno"> 774</span>  dy = (short) (sdy >> 16);</div>
<div class="line"><a name="l00775"></a><span class="lineno"> 775</span>  <span class="keywordflow">if</span> (flipx) dx = (src->w-1)-dx;</div>
<div class="line"><a name="l00776"></a><span class="lineno"> 776</span>  <span class="keywordflow">if</span> (flipy) dy = (src->h-1)-dy;</div>
<div class="line"><a name="l00777"></a><span class="lineno"> 777</span>  <span class="keywordflow">if</span> ((dx >= 0) && (dy >= 0) && (dx < src->w) && (dy < src->h)) {</div>
<div class="line"><a name="l00778"></a><span class="lineno"> 778</span>  sp = (<a class="code" href="structt_color_y.html">tColorY</a> *) (src->pixels);</div>
<div class="line"><a name="l00779"></a><span class="lineno"> 779</span>  sp += (src->pitch * dy + dx);</div>
<div class="line"><a name="l00780"></a><span class="lineno"> 780</span>  *pc = *sp;</div>
<div class="line"><a name="l00781"></a><span class="lineno"> 781</span>  }</div>
<div class="line"><a name="l00782"></a><span class="lineno"> 782</span>  sdx += icos;</div>
<div class="line"><a name="l00783"></a><span class="lineno"> 783</span>  sdy += isin;</div>
<div class="line"><a name="l00784"></a><span class="lineno"> 784</span>  pc++;</div>
<div class="line"><a name="l00785"></a><span class="lineno"> 785</span>  }</div>
<div class="line"><a name="l00786"></a><span class="lineno"> 786</span>  pc += gap;</div>
<div class="line"><a name="l00787"></a><span class="lineno"> 787</span>  }</div>
<div class="line"><a name="l00788"></a><span class="lineno"> 788</span> }</div>
<div class="line"><a name="l00789"></a><span class="lineno"> 789</span> </div>
<div class="line"><a name="l00803"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8h.html#ac2858dec47549c8f82360568b5a29363"> 803</a></span> SDL_Surface* <a class="code" href="_s_d_l2__rotozoom_8c.html#a77563d68634cb2624d4f2f0bcdc19e73">rotateSurface90Degrees</a>(SDL_Surface* src, <span class="keywordtype">int</span> numClockwiseTurns) </div>
<div class="line"><a name="l00804"></a><span class="lineno"> 804</span> {</div>
<div class="line"><a name="l00805"></a><span class="lineno"> 805</span>  <span class="keywordtype">int</span> row, col, newWidth, newHeight;</div>
<div class="line"><a name="l00806"></a><span class="lineno"> 806</span>  <span class="keywordtype">int</span> bpp, bpr;</div>
<div class="line"><a name="l00807"></a><span class="lineno"> 807</span>  SDL_Surface* dst;</div>
<div class="line"><a name="l00808"></a><span class="lineno"> 808</span>  Uint8* srcBuf;</div>
<div class="line"><a name="l00809"></a><span class="lineno"> 809</span>  Uint8* dstBuf;</div>
<div class="line"><a name="l00810"></a><span class="lineno"> 810</span>  <span class="keywordtype">int</span> normalizedClockwiseTurns;</div>
<div class="line"><a name="l00811"></a><span class="lineno"> 811</span> </div>
<div class="line"><a name="l00812"></a><span class="lineno"> 812</span>  <span class="comment">/* Has to be a valid surface pointer and be a Nbit surface where n is divisible by 8 */</span></div>
<div class="line"><a name="l00813"></a><span class="lineno"> 813</span>  <span class="keywordflow">if</span> (!src || </div>
<div class="line"><a name="l00814"></a><span class="lineno"> 814</span>  !src->format) {</div>
<div class="line"><a name="l00815"></a><span class="lineno"> 815</span>  SDL_SetError(<span class="stringliteral">"NULL source surface or source surface format"</span>);</div>
<div class="line"><a name="l00816"></a><span class="lineno"> 816</span>  <span class="keywordflow">return</span> NULL; </div>
<div class="line"><a name="l00817"></a><span class="lineno"> 817</span>  }</div>
<div class="line"><a name="l00818"></a><span class="lineno"> 818</span> </div>
<div class="line"><a name="l00819"></a><span class="lineno"> 819</span>  <span class="keywordflow">if</span> ((src->format->BitsPerPixel % 8) != 0) {</div>
<div class="line"><a name="l00820"></a><span class="lineno"> 820</span>  SDL_SetError(<span class="stringliteral">"Invalid source surface bit depth"</span>);</div>
<div class="line"><a name="l00821"></a><span class="lineno"> 821</span>  <span class="keywordflow">return</span> NULL; </div>
<div class="line"><a name="l00822"></a><span class="lineno"> 822</span>  }</div>
<div class="line"><a name="l00823"></a><span class="lineno"> 823</span> </div>
<div class="line"><a name="l00824"></a><span class="lineno"> 824</span>  <span class="comment">/* normalize numClockwiseTurns */</span></div>
<div class="line"><a name="l00825"></a><span class="lineno"> 825</span>  normalizedClockwiseTurns = (numClockwiseTurns % 4);</div>
<div class="line"><a name="l00826"></a><span class="lineno"> 826</span>  <span class="keywordflow">if</span> (normalizedClockwiseTurns < 0) {</div>
<div class="line"><a name="l00827"></a><span class="lineno"> 827</span>  normalizedClockwiseTurns += 4;</div>
<div class="line"><a name="l00828"></a><span class="lineno"> 828</span>  }</div>
<div class="line"><a name="l00829"></a><span class="lineno"> 829</span> </div>
<div class="line"><a name="l00830"></a><span class="lineno"> 830</span>  <span class="comment">/* If turns are even, our new width/height will be the same as the source surface */</span></div>
<div class="line"><a name="l00831"></a><span class="lineno"> 831</span>  <span class="keywordflow">if</span> (normalizedClockwiseTurns % 2) {</div>
<div class="line"><a name="l00832"></a><span class="lineno"> 832</span>  newWidth = src->h;</div>
<div class="line"><a name="l00833"></a><span class="lineno"> 833</span>  newHeight = src->w;</div>
<div class="line"><a name="l00834"></a><span class="lineno"> 834</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00835"></a><span class="lineno"> 835</span>  newWidth = src->w;</div>
<div class="line"><a name="l00836"></a><span class="lineno"> 836</span>  newHeight = src->h;</div>
<div class="line"><a name="l00837"></a><span class="lineno"> 837</span>  }</div>
<div class="line"><a name="l00838"></a><span class="lineno"> 838</span> </div>
<div class="line"><a name="l00839"></a><span class="lineno"> 839</span>  dst = SDL_CreateRGBSurface( src->flags, newWidth, newHeight, src->format->BitsPerPixel,</div>
<div class="line"><a name="l00840"></a><span class="lineno"> 840</span>  src->format->Rmask,</div>
<div class="line"><a name="l00841"></a><span class="lineno"> 841</span>  src->format->Gmask, </div>
<div class="line"><a name="l00842"></a><span class="lineno"> 842</span>  src->format->Bmask, </div>
<div class="line"><a name="l00843"></a><span class="lineno"> 843</span>  src->format->Amask);</div>
<div class="line"><a name="l00844"></a><span class="lineno"> 844</span>  <span class="keywordflow">if</span>(!dst) {</div>
<div class="line"><a name="l00845"></a><span class="lineno"> 845</span>  SDL_SetError(<span class="stringliteral">"Could not create destination surface"</span>); </div>
<div class="line"><a name="l00846"></a><span class="lineno"> 846</span>  <span class="keywordflow">return</span> NULL;</div>
<div class="line"><a name="l00847"></a><span class="lineno"> 847</span>  }</div>
<div class="line"><a name="l00848"></a><span class="lineno"> 848</span> </div>
<div class="line"><a name="l00849"></a><span class="lineno"> 849</span>  <span class="keywordflow">if</span> (SDL_MUSTLOCK(src)) {</div>
<div class="line"><a name="l00850"></a><span class="lineno"> 850</span>  SDL_LockSurface(src);</div>
<div class="line"><a name="l00851"></a><span class="lineno"> 851</span>  }</div>
<div class="line"><a name="l00852"></a><span class="lineno"> 852</span>  <span class="keywordflow">if</span> (SDL_MUSTLOCK(dst)) {</div>
<div class="line"><a name="l00853"></a><span class="lineno"> 853</span>  SDL_LockSurface(dst);</div>
<div class="line"><a name="l00854"></a><span class="lineno"> 854</span>  }</div>
<div class="line"><a name="l00855"></a><span class="lineno"> 855</span> </div>
<div class="line"><a name="l00856"></a><span class="lineno"> 856</span>  <span class="comment">/* Calculate byte-per-pixel */</span></div>
<div class="line"><a name="l00857"></a><span class="lineno"> 857</span>  bpp = src->format->BitsPerPixel / 8;</div>
<div class="line"><a name="l00858"></a><span class="lineno"> 858</span> </div>
<div class="line"><a name="l00859"></a><span class="lineno"> 859</span>  <span class="keywordflow">switch</span>(normalizedClockwiseTurns) {</div>
<div class="line"><a name="l00860"></a><span class="lineno"> 860</span>  <span class="keywordflow">case</span> 0: <span class="comment">/* Make a copy of the surface */</span></div>
<div class="line"><a name="l00861"></a><span class="lineno"> 861</span>  {</div>
<div class="line"><a name="l00862"></a><span class="lineno"> 862</span>  <span class="comment">/* Unfortunately SDL_BlitSurface cannot be used to make a copy of the surface</span></div>
<div class="line"><a name="l00863"></a><span class="lineno"> 863</span> <span class="comment"> since it does not preserve alpha. */</span></div>
<div class="line"><a name="l00864"></a><span class="lineno"> 864</span> </div>
<div class="line"><a name="l00865"></a><span class="lineno"> 865</span>  <span class="keywordflow">if</span> (src->pitch == dst->pitch) {</div>
<div class="line"><a name="l00866"></a><span class="lineno"> 866</span>  <span class="comment">/* If the pitch is the same for both surfaces, the memory can be copied all at once. */</span></div>
<div class="line"><a name="l00867"></a><span class="lineno"> 867</span>  memcpy(dst->pixels, src->pixels, (src->h * src->pitch));</div>
<div class="line"><a name="l00868"></a><span class="lineno"> 868</span>  }</div>
<div class="line"><a name="l00869"></a><span class="lineno"> 869</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00870"></a><span class="lineno"> 870</span>  {</div>
<div class="line"><a name="l00871"></a><span class="lineno"> 871</span>  <span class="comment">/* If the pitch differs, copy each row separately */</span></div>
<div class="line"><a name="l00872"></a><span class="lineno"> 872</span>  srcBuf = (Uint8*)(src->pixels);</div>
<div class="line"><a name="l00873"></a><span class="lineno"> 873</span>  dstBuf = (Uint8*)(dst->pixels);</div>
<div class="line"><a name="l00874"></a><span class="lineno"> 874</span>  bpr = src->w * bpp;</div>
<div class="line"><a name="l00875"></a><span class="lineno"> 875</span>  <span class="keywordflow">for</span> (row = 0; row < src->h; row++) {</div>
<div class="line"><a name="l00876"></a><span class="lineno"> 876</span>  memcpy(dstBuf, srcBuf, bpr);</div>
<div class="line"><a name="l00877"></a><span class="lineno"> 877</span>  srcBuf += src->pitch;</div>
<div class="line"><a name="l00878"></a><span class="lineno"> 878</span>  dstBuf += dst->pitch;</div>
<div class="line"><a name="l00879"></a><span class="lineno"> 879</span>  }</div>
<div class="line"><a name="l00880"></a><span class="lineno"> 880</span>  }</div>
<div class="line"><a name="l00881"></a><span class="lineno"> 881</span>  }</div>
<div class="line"><a name="l00882"></a><span class="lineno"> 882</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00883"></a><span class="lineno"> 883</span> </div>
<div class="line"><a name="l00884"></a><span class="lineno"> 884</span>  <span class="comment">/* rotate clockwise */</span></div>
<div class="line"><a name="l00885"></a><span class="lineno"> 885</span>  <span class="keywordflow">case</span> 1: <span class="comment">/* rotated 90 degrees clockwise */</span></div>
<div class="line"><a name="l00886"></a><span class="lineno"> 886</span>  {</div>
<div class="line"><a name="l00887"></a><span class="lineno"> 887</span>  <span class="keywordflow">for</span> (row = 0; row < src->h; ++row) {</div>
<div class="line"><a name="l00888"></a><span class="lineno"> 888</span>  srcBuf = (Uint8*)(src->pixels) + (row * src->pitch);</div>
<div class="line"><a name="l00889"></a><span class="lineno"> 889</span>  dstBuf = (Uint8*)(dst->pixels) + (dst->w - row - 1) * bpp;</div>
<div class="line"><a name="l00890"></a><span class="lineno"> 890</span>  <span class="keywordflow">for</span> (col = 0; col < src->w; ++col) {</div>
<div class="line"><a name="l00891"></a><span class="lineno"> 891</span>  memcpy (dstBuf, srcBuf, bpp);</div>
<div class="line"><a name="l00892"></a><span class="lineno"> 892</span>  srcBuf += bpp;</div>
<div class="line"><a name="l00893"></a><span class="lineno"> 893</span>  dstBuf += dst->pitch;</div>
<div class="line"><a name="l00894"></a><span class="lineno"> 894</span>  } </div>
<div class="line"><a name="l00895"></a><span class="lineno"> 895</span>  } </div>
<div class="line"><a name="l00896"></a><span class="lineno"> 896</span>  }</div>
<div class="line"><a name="l00897"></a><span class="lineno"> 897</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00898"></a><span class="lineno"> 898</span> </div>
<div class="line"><a name="l00899"></a><span class="lineno"> 899</span>  <span class="keywordflow">case</span> 2: <span class="comment">/* rotated 180 degrees clockwise */</span></div>
<div class="line"><a name="l00900"></a><span class="lineno"> 900</span>  {</div>
<div class="line"><a name="l00901"></a><span class="lineno"> 901</span>  <span class="keywordflow">for</span> (row = 0; row < src->h; ++row) {</div>
<div class="line"><a name="l00902"></a><span class="lineno"> 902</span>  srcBuf = (Uint8*)(src->pixels) + (row * src->pitch);</div>
<div class="line"><a name="l00903"></a><span class="lineno"> 903</span>  dstBuf = (Uint8*)(dst->pixels) + ((dst->h - row - 1) * dst->pitch) + (dst->w - 1) * bpp;</div>
<div class="line"><a name="l00904"></a><span class="lineno"> 904</span>  <span class="keywordflow">for</span> (col = 0; col < src->w; ++col) {</div>
<div class="line"><a name="l00905"></a><span class="lineno"> 905</span>  memcpy (dstBuf, srcBuf, bpp);</div>
<div class="line"><a name="l00906"></a><span class="lineno"> 906</span>  srcBuf += bpp;</div>
<div class="line"><a name="l00907"></a><span class="lineno"> 907</span>  dstBuf -= bpp;</div>
<div class="line"><a name="l00908"></a><span class="lineno"> 908</span>  } </div>
<div class="line"><a name="l00909"></a><span class="lineno"> 909</span>  } </div>
<div class="line"><a name="l00910"></a><span class="lineno"> 910</span>  }</div>
<div class="line"><a name="l00911"></a><span class="lineno"> 911</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00912"></a><span class="lineno"> 912</span> </div>
<div class="line"><a name="l00913"></a><span class="lineno"> 913</span>  <span class="keywordflow">case</span> 3: <span class="comment">/* rotated 270 degrees clockwise */</span></div>
<div class="line"><a name="l00914"></a><span class="lineno"> 914</span>  {</div>
<div class="line"><a name="l00915"></a><span class="lineno"> 915</span>  <span class="keywordflow">for</span> (row = 0; row < src->h; ++row) {</div>
<div class="line"><a name="l00916"></a><span class="lineno"> 916</span>  srcBuf = (Uint8*)(src->pixels) + (row * src->pitch);</div>
<div class="line"><a name="l00917"></a><span class="lineno"> 917</span>  dstBuf = (Uint8*)(dst->pixels) + (row * bpp) + (dst->h * dst->pitch);</div>
<div class="line"><a name="l00918"></a><span class="lineno"> 918</span>  <span class="keywordflow">for</span> (col = 0; col < src->w; ++col) {</div>
<div class="line"><a name="l00919"></a><span class="lineno"> 919</span>  memcpy (dstBuf, srcBuf, bpp);</div>
<div class="line"><a name="l00920"></a><span class="lineno"> 920</span>  srcBuf += bpp;</div>
<div class="line"><a name="l00921"></a><span class="lineno"> 921</span>  dstBuf -= dst->pitch;</div>
<div class="line"><a name="l00922"></a><span class="lineno"> 922</span>  } </div>
<div class="line"><a name="l00923"></a><span class="lineno"> 923</span>  } </div>
<div class="line"><a name="l00924"></a><span class="lineno"> 924</span>  }</div>
<div class="line"><a name="l00925"></a><span class="lineno"> 925</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00926"></a><span class="lineno"> 926</span>  } </div>
<div class="line"><a name="l00927"></a><span class="lineno"> 927</span>  <span class="comment">/* end switch */</span></div>
<div class="line"><a name="l00928"></a><span class="lineno"> 928</span> </div>
<div class="line"><a name="l00929"></a><span class="lineno"> 929</span>  <span class="keywordflow">if</span> (SDL_MUSTLOCK(src)) {</div>
<div class="line"><a name="l00930"></a><span class="lineno"> 930</span>  SDL_UnlockSurface(src);</div>
<div class="line"><a name="l00931"></a><span class="lineno"> 931</span>  }</div>
<div class="line"><a name="l00932"></a><span class="lineno"> 932</span>  <span class="keywordflow">if</span> (SDL_MUSTLOCK(dst)) {</div>
<div class="line"><a name="l00933"></a><span class="lineno"> 933</span>  SDL_UnlockSurface(dst);</div>
<div class="line"><a name="l00934"></a><span class="lineno"> 934</span>  }</div>
<div class="line"><a name="l00935"></a><span class="lineno"> 935</span> </div>
<div class="line"><a name="l00936"></a><span class="lineno"> 936</span>  <span class="keywordflow">return</span> dst;</div>
<div class="line"><a name="l00937"></a><span class="lineno"> 937</span> }</div>
<div class="line"><a name="l00938"></a><span class="lineno"> 938</span> </div>
<div class="line"><a name="l00939"></a><span class="lineno"> 939</span> </div>
<div class="line"><a name="l00954"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8"> 954</a></span> <span class="keywordtype">void</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8">_rotozoomSurfaceSizeTrig</a>(<span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">double</span> angle, <span class="keywordtype">double</span> zoomx, <span class="keywordtype">double</span> zoomy, </div>
<div class="line"><a name="l00955"></a><span class="lineno"> 955</span>  <span class="keywordtype">int</span> *dstwidth, <span class="keywordtype">int</span> *dstheight, </div>
<div class="line"><a name="l00956"></a><span class="lineno"> 956</span>  <span class="keywordtype">double</span> *canglezoom, <span class="keywordtype">double</span> *sanglezoom)</div>
<div class="line"><a name="l00957"></a><span class="lineno"> 957</span> {</div>
<div class="line"><a name="l00958"></a><span class="lineno"> 958</span>  <span class="keywordtype">double</span> x, y, cx, cy, sx, sy;</div>
<div class="line"><a name="l00959"></a><span class="lineno"> 959</span>  <span class="keywordtype">double</span> radangle;</div>
<div class="line"><a name="l00960"></a><span class="lineno"> 960</span>  <span class="keywordtype">int</span> dstwidthhalf, dstheighthalf;</div>
<div class="line"><a name="l00961"></a><span class="lineno"> 961</span> </div>
<div class="line"><a name="l00962"></a><span class="lineno"> 962</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00963"></a><span class="lineno"> 963</span> <span class="comment"> * Determine destination width and height by rotating a centered source box </span></div>
<div class="line"><a name="l00964"></a><span class="lineno"> 964</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00965"></a><span class="lineno"> 965</span>  radangle = angle * (<a class="code" href="_s_d_l2__gfx_primitives_8h.html#ae71449b1cc6e6250b91f539153a7a0d3">M_PI</a> / 180.0);</div>
<div class="line"><a name="l00966"></a><span class="lineno"> 966</span>  *sanglezoom = sin(radangle);</div>
<div class="line"><a name="l00967"></a><span class="lineno"> 967</span>  *canglezoom = cos(radangle);</div>
<div class="line"><a name="l00968"></a><span class="lineno"> 968</span>  *sanglezoom *= zoomx;</div>
<div class="line"><a name="l00969"></a><span class="lineno"> 969</span>  *canglezoom *= zoomx;</div>
<div class="line"><a name="l00970"></a><span class="lineno"> 970</span>  x = (double)(width / 2);</div>
<div class="line"><a name="l00971"></a><span class="lineno"> 971</span>  y = (double)(height / 2);</div>
<div class="line"><a name="l00972"></a><span class="lineno"> 972</span>  cx = *canglezoom * x;</div>
<div class="line"><a name="l00973"></a><span class="lineno"> 973</span>  cy = *canglezoom * y;</div>
<div class="line"><a name="l00974"></a><span class="lineno"> 974</span>  sx = *sanglezoom * x;</div>
<div class="line"><a name="l00975"></a><span class="lineno"> 975</span>  sy = *sanglezoom * y;</div>
<div class="line"><a name="l00976"></a><span class="lineno"> 976</span> </div>
<div class="line"><a name="l00977"></a><span class="lineno"> 977</span>  dstwidthhalf = <a class="code" href="_s_d_l2__rotozoom_8c.html#a6480bf180457e531eba02b6a66d84dad">MAX</a>((<span class="keywordtype">int</span>)</div>
<div class="line"><a name="l00978"></a><span class="lineno"> 978</span>  ceil(<a class="code" href="_s_d_l2__rotozoom_8c.html#a6480bf180457e531eba02b6a66d84dad">MAX</a>(<a class="code" href="_s_d_l2__rotozoom_8c.html#a6480bf180457e531eba02b6a66d84dad">MAX</a>(<a class="code" href="_s_d_l2__rotozoom_8c.html#a6480bf180457e531eba02b6a66d84dad">MAX</a>(fabs(cx + sy), fabs(cx - sy)), fabs(-cx + sy)), fabs(-cx - sy))), 1);</div>
<div class="line"><a name="l00979"></a><span class="lineno"> 979</span>  dstheighthalf = <a class="code" href="_s_d_l2__rotozoom_8c.html#a6480bf180457e531eba02b6a66d84dad">MAX</a>((<span class="keywordtype">int</span>)</div>
<div class="line"><a name="l00980"></a><span class="lineno"> 980</span>  ceil(<a class="code" href="_s_d_l2__rotozoom_8c.html#a6480bf180457e531eba02b6a66d84dad">MAX</a>(<a class="code" href="_s_d_l2__rotozoom_8c.html#a6480bf180457e531eba02b6a66d84dad">MAX</a>(<a class="code" href="_s_d_l2__rotozoom_8c.html#a6480bf180457e531eba02b6a66d84dad">MAX</a>(fabs(sx + cy), fabs(sx - cy)), fabs(-sx + cy)), fabs(-sx - cy))), 1);</div>
<div class="line"><a name="l00981"></a><span class="lineno"> 981</span>  *dstwidth = 2 * dstwidthhalf;</div>
<div class="line"><a name="l00982"></a><span class="lineno"> 982</span>  *dstheight = 2 * dstheighthalf;</div>
<div class="line"><a name="l00983"></a><span class="lineno"> 983</span> }</div>
<div class="line"><a name="l00984"></a><span class="lineno"> 984</span> </div>
<div class="line"><a name="l00996"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8h.html#aa0126562efa572575e3962fe51d69e7c"> 996</a></span> <span class="keywordtype">void</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#aee64992d26c818d9975610754d5c929b">rotozoomSurfaceSizeXY</a>(<span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">double</span> angle, <span class="keywordtype">double</span> zoomx, <span class="keywordtype">double</span> zoomy, <span class="keywordtype">int</span> *dstwidth, <span class="keywordtype">int</span> *dstheight)</div>
<div class="line"><a name="l00997"></a><span class="lineno"> 997</span> {</div>
<div class="line"><a name="l00998"></a><span class="lineno"> 998</span>  <span class="keywordtype">double</span> dummy_sanglezoom, dummy_canglezoom;</div>
<div class="line"><a name="l00999"></a><span class="lineno"> 999</span> </div>
<div class="line"><a name="l01000"></a><span class="lineno"> 1000</span>  <a class="code" href="_s_d_l2__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8">_rotozoomSurfaceSizeTrig</a>(width, height, angle, zoomx, zoomy, dstwidth, dstheight, &dummy_sanglezoom, &dummy_canglezoom);</div>
<div class="line"><a name="l01001"></a><span class="lineno"> 1001</span> }</div>
<div class="line"><a name="l01002"></a><span class="lineno"> 1002</span> </div>
<div class="line"><a name="l01013"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8h.html#a9097c513174e2d97603292c08a9db923"> 1013</a></span> <span class="keywordtype">void</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#a9886c783255edfd70a4974f8f3dd5a8c">rotozoomSurfaceSize</a>(<span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">double</span> angle, <span class="keywordtype">double</span> zoom, <span class="keywordtype">int</span> *dstwidth, <span class="keywordtype">int</span> *dstheight)</div>
<div class="line"><a name="l01014"></a><span class="lineno"> 1014</span> {</div>
<div class="line"><a name="l01015"></a><span class="lineno"> 1015</span>  <span class="keywordtype">double</span> dummy_sanglezoom, dummy_canglezoom;</div>
<div class="line"><a name="l01016"></a><span class="lineno"> 1016</span> </div>
<div class="line"><a name="l01017"></a><span class="lineno"> 1017</span>  <a class="code" href="_s_d_l2__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8">_rotozoomSurfaceSizeTrig</a>(width, height, angle, zoom, zoom, dstwidth, dstheight, &dummy_sanglezoom, &dummy_canglezoom);</div>
<div class="line"><a name="l01018"></a><span class="lineno"> 1018</span> }</div>
<div class="line"><a name="l01019"></a><span class="lineno"> 1019</span> </div>
<div class="line"><a name="l01035"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8h.html#a6f5f31a362f63370dc60049df14d6856"> 1035</a></span> SDL_Surface *<a class="code" href="_s_d_l2__rotozoom_8c.html#a5f64ed53eeee5f2667971c857698d1e5">rotozoomSurface</a>(SDL_Surface * src, <span class="keywordtype">double</span> angle, <span class="keywordtype">double</span> zoom, <span class="keywordtype">int</span> smooth)</div>
<div class="line"><a name="l01036"></a><span class="lineno"> 1036</span> {</div>
<div class="line"><a name="l01037"></a><span class="lineno"> 1037</span>  <span class="keywordflow">return</span> <a class="code" href="_s_d_l2__rotozoom_8c.html#aab98b5b0da4ea468bacf47f7b85f0ee2">rotozoomSurfaceXY</a>(src, angle, zoom, zoom, smooth);</div>
<div class="line"><a name="l01038"></a><span class="lineno"> 1038</span> }</div>
<div class="line"><a name="l01039"></a><span class="lineno"> 1039</span> </div>
<div class="line"><a name="l01056"></a><span class="lineno"><a class="line" href="_s_d_l2__rotozoom_8h.html#a592d84489ce544c050a9f3fe0e04f3f6"> 1056</a></span> SDL_Surface *<a class="code" href="_s_d_l2__rotozoom_8c.html#aab98b5b0da4ea468bacf47f7b85f0ee2">rotozoomSurfaceXY</a>(SDL_Surface * src, <span class="keywordtype">double</span> angle, <span class="keywordtype">double</span> zoomx, <span class="keywordtype">double</span> zoomy, <span class="keywordtype">int</span> smooth)</div>
<div class="line"><a name="l01057"></a><span class="lineno"> 1057</span> {</div>
<div class="line"><a name="l01058"></a><span class="lineno"> 1058</span>  SDL_Surface *rz_src;</div>
<div class="line"><a name="l01059"></a><span class="lineno"> 1059</span>  SDL_Surface *rz_dst;</div>
<div class="line"><a name="l01060"></a><span class="lineno"> 1060</span>  <span class="keywordtype">double</span> zoominv;</div>
<div class="line"><a name="l01061"></a><span class="lineno"> 1061</span>  <span class="keywordtype">double</span> sanglezoom, canglezoom, sanglezoominv, canglezoominv;</div>
<div class="line"><a name="l01062"></a><span class="lineno"> 1062</span>  <span class="keywordtype">int</span> dstwidthhalf, dstwidth, dstheighthalf, dstheight;</div>
<div class="line"><a name="l01063"></a><span class="lineno"> 1063</span>  <span class="keywordtype">int</span> is32bit;</div>
<div class="line"><a name="l01064"></a><span class="lineno"> 1064</span>  <span class="keywordtype">int</span> i, src_converted;</div>
<div class="line"><a name="l01065"></a><span class="lineno"> 1065</span>  <span class="keywordtype">int</span> flipx,flipy;</div>
<div class="line"><a name="l01066"></a><span class="lineno"> 1066</span> </div>
<div class="line"><a name="l01067"></a><span class="lineno"> 1067</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l01068"></a><span class="lineno"> 1068</span> <span class="comment"> * Sanity check </span></div>
<div class="line"><a name="l01069"></a><span class="lineno"> 1069</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01070"></a><span class="lineno"> 1070</span>  <span class="keywordflow">if</span> (src == NULL) {</div>
<div class="line"><a name="l01071"></a><span class="lineno"> 1071</span>  <span class="keywordflow">return</span> (NULL);</div>
<div class="line"><a name="l01072"></a><span class="lineno"> 1072</span>  }</div>
<div class="line"><a name="l01073"></a><span class="lineno"> 1073</span> </div>
<div class="line"><a name="l01074"></a><span class="lineno"> 1074</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l01075"></a><span class="lineno"> 1075</span> <span class="comment"> * Determine if source surface is 32bit or 8bit </span></div>
<div class="line"><a name="l01076"></a><span class="lineno"> 1076</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01077"></a><span class="lineno"> 1077</span>  is32bit = (src->format->BitsPerPixel == 32);</div>
<div class="line"><a name="l01078"></a><span class="lineno"> 1078</span>  <span class="keywordflow">if</span> ((is32bit) || (src->format->BitsPerPixel == 8)) {</div>
<div class="line"><a name="l01079"></a><span class="lineno"> 1079</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l01080"></a><span class="lineno"> 1080</span> <span class="comment"> * Use source surface 'as is' </span></div>
<div class="line"><a name="l01081"></a><span class="lineno"> 1081</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01082"></a><span class="lineno"> 1082</span>  rz_src = src;</div>
<div class="line"><a name="l01083"></a><span class="lineno"> 1083</span>  src_converted = 0;</div>
<div class="line"><a name="l01084"></a><span class="lineno"> 1084</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01085"></a><span class="lineno"> 1085</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l01086"></a><span class="lineno"> 1086</span> <span class="comment"> * New source surface is 32bit with a defined RGBA ordering </span></div>
<div class="line"><a name="l01087"></a><span class="lineno"> 1087</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01088"></a><span class="lineno"> 1088</span>  rz_src =</div>
<div class="line"><a name="l01089"></a><span class="lineno"> 1089</span>  SDL_CreateRGBSurface(SDL_SWSURFACE, src->w, src->h, 32, </div>
<div class="line"><a name="l01090"></a><span class="lineno"> 1090</span> #<span class="keywordflow">if</span> SDL_BYTEORDER == SDL_LIL_ENDIAN</div>
<div class="line"><a name="l01091"></a><span class="lineno"> 1091</span>  0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000</div>
<div class="line"><a name="l01092"></a><span class="lineno"> 1092</span> #<span class="keywordflow">else</span></div>
<div class="line"><a name="l01093"></a><span class="lineno"> 1093</span>  0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff</div>
<div class="line"><a name="l01094"></a><span class="lineno"> 1094</span> #endif</div>
<div class="line"><a name="l01095"></a><span class="lineno"> 1095</span>  );</div>
<div class="line"><a name="l01096"></a><span class="lineno"> 1096</span> </div>
<div class="line"><a name="l01097"></a><span class="lineno"> 1097</span>  SDL_BlitSurface(src, NULL, rz_src, NULL);</div>
<div class="line"><a name="l01098"></a><span class="lineno"> 1098</span> </div>
<div class="line"><a name="l01099"></a><span class="lineno"> 1099</span>  src_converted = 1;</div>
<div class="line"><a name="l01100"></a><span class="lineno"> 1100</span>  is32bit = 1;</div>
<div class="line"><a name="l01101"></a><span class="lineno"> 1101</span>  }</div>
<div class="line"><a name="l01102"></a><span class="lineno"> 1102</span> </div>
<div class="line"><a name="l01103"></a><span class="lineno"> 1103</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l01104"></a><span class="lineno"> 1104</span> <span class="comment"> * Sanity check zoom factor </span></div>
<div class="line"><a name="l01105"></a><span class="lineno"> 1105</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01106"></a><span class="lineno"> 1106</span>  flipx = (zoomx<0.0);</div>
<div class="line"><a name="l01107"></a><span class="lineno"> 1107</span>  <span class="keywordflow">if</span> (flipx) zoomx=-zoomx;</div>
<div class="line"><a name="l01108"></a><span class="lineno"> 1108</span>  flipy = (zoomy<0.0);</div>
<div class="line"><a name="l01109"></a><span class="lineno"> 1109</span>  <span class="keywordflow">if</span> (flipy) zoomy=-zoomy;</div>
<div class="line"><a name="l01110"></a><span class="lineno"> 1110</span>  <span class="keywordflow">if</span> (zoomx < <a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9">VALUE_LIMIT</a>) zoomx = <a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9">VALUE_LIMIT</a>;</div>
<div class="line"><a name="l01111"></a><span class="lineno"> 1111</span>  <span class="keywordflow">if</span> (zoomy < <a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9">VALUE_LIMIT</a>) zoomy = <a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9">VALUE_LIMIT</a>;</div>
<div class="line"><a name="l01112"></a><span class="lineno"> 1112</span>  zoominv = 65536.0 / (zoomx * zoomx);</div>
<div class="line"><a name="l01113"></a><span class="lineno"> 1113</span> </div>
<div class="line"><a name="l01114"></a><span class="lineno"> 1114</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l01115"></a><span class="lineno"> 1115</span> <span class="comment"> * Check if we have a rotozoom or just a zoom </span></div>
<div class="line"><a name="l01116"></a><span class="lineno"> 1116</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01117"></a><span class="lineno"> 1117</span>  <span class="keywordflow">if</span> (fabs(angle) > <a class="code" href="_s_d_l2__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9">VALUE_LIMIT</a>) {</div>
<div class="line"><a name="l01118"></a><span class="lineno"> 1118</span> </div>
<div class="line"><a name="l01119"></a><span class="lineno"> 1119</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l01120"></a><span class="lineno"> 1120</span> <span class="comment"> * Angle!=0: full rotozoom </span></div>
<div class="line"><a name="l01121"></a><span class="lineno"> 1121</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01122"></a><span class="lineno"> 1122</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l01123"></a><span class="lineno"> 1123</span> <span class="comment"> * ----------------------- </span></div>
<div class="line"><a name="l01124"></a><span class="lineno"> 1124</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01125"></a><span class="lineno"> 1125</span> </div>
<div class="line"><a name="l01126"></a><span class="lineno"> 1126</span>  <span class="comment">/* Determine target size */</span></div>
<div class="line"><a name="l01127"></a><span class="lineno"> 1127</span>  <a class="code" href="_s_d_l2__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8">_rotozoomSurfaceSizeTrig</a>(rz_src->w, rz_src->h, angle, zoomx, zoomy, &dstwidth, &dstheight, &canglezoom, &sanglezoom);</div>
<div class="line"><a name="l01128"></a><span class="lineno"> 1128</span> </div>
<div class="line"><a name="l01129"></a><span class="lineno"> 1129</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l01130"></a><span class="lineno"> 1130</span> <span class="comment"> * Calculate target factors from sin/cos and zoom </span></div>
<div class="line"><a name="l01131"></a><span class="lineno"> 1131</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01132"></a><span class="lineno"> 1132</span>  sanglezoominv = sanglezoom;</div>
<div class="line"><a name="l01133"></a><span class="lineno"> 1133</span>  canglezoominv = canglezoom;</div>
<div class="line"><a name="l01134"></a><span class="lineno"> 1134</span>  sanglezoominv *= zoominv;</div>
<div class="line"><a name="l01135"></a><span class="lineno"> 1135</span>  canglezoominv *= zoominv;</div>
<div class="line"><a name="l01136"></a><span class="lineno"> 1136</span> </div>
<div class="line"><a name="l01137"></a><span class="lineno"> 1137</span>  <span class="comment">/* Calculate half size */</span></div>
<div class="line"><a name="l01138"></a><span class="lineno"> 1138</span>  dstwidthhalf = dstwidth / 2;</div>
<div class="line"><a name="l01139"></a><span class="lineno"> 1139</span>  dstheighthalf = dstheight / 2;</div>
<div class="line"><a name="l01140"></a><span class="lineno"> 1140</span> </div>
<div class="line"><a name="l01141"></a><span class="lineno"> 1141</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l01142"></a><span class="lineno"> 1142</span> <span class="comment"> * Alloc space to completely contain the rotated surface </span></div>
<div class="line"><a name="l01143"></a><span class="lineno"> 1143</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01144"></a><span class="lineno"> 1144</span>  rz_dst = NULL;</div>
<div class="line"><a name="l01145"></a><span class="lineno"> 1145</span>  <span class="keywordflow">if</span> (is32bit) {</div>
<div class="line"><a name="l01146"></a><span class="lineno"> 1146</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l01147"></a><span class="lineno"> 1147</span> <span class="comment"> * Target surface is 32bit with source RGBA/ABGR ordering </span></div>
<div class="line"><a name="l01148"></a><span class="lineno"> 1148</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01149"></a><span class="lineno"> 1149</span>  rz_dst =</div>
<div class="line"><a name="l01150"></a><span class="lineno"> 1150</span>  SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l2__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb">GUARD_ROWS</a>, 32,</div>
<div class="line"><a name="l01151"></a><span class="lineno"> 1151</span>  rz_src->format->Rmask, rz_src->format->Gmask,</div>
<div class="line"><a name="l01152"></a><span class="lineno"> 1152</span>  rz_src->format->Bmask, rz_src->format->Amask);</div>