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<h1>SDL_rotozoom.c</h1><a href="_s_d_l__rotozoom_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* </span>
<a name="l00002"></a>00002 <span class="comment"></span>
<a name="l00003"></a>00003 <span class="comment">SDL_rotozoom.c - rotozoomer, zoomer and shrinker for 32bit or 8bit surfaces</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">LGPL (c) A. Schiffler</span>
<a name="l00006"></a>00006 <span class="comment"></span>
<a name="l00007"></a>00007 <span class="comment">*/</span>
<a name="l00008"></a>00008
<a name="l00009"></a>00009 <span class="preprocessor">#ifdef WIN32</span>
<a name="l00010"></a>00010 <span class="preprocessor"></span><span class="preprocessor">#include <windows.h></span>
<a name="l00011"></a>00011 <span class="preprocessor">#endif</span>
<a name="l00012"></a>00012 <span class="preprocessor"></span>
<a name="l00013"></a>00013 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00014"></a>00014 <span class="preprocessor">#include <string.h></span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="preprocessor">#include "<a class="code" href="_s_d_l__rotozoom_8h.html">SDL_rotozoom.h</a>"</span>
<a name="l00017"></a>00017
<a name="l00018"></a>00018 <span class="comment">/* ---- Internally used structures */</span>
<a name="l00019"></a>00019
<a name="l00023"></a><a class="code" href="structt_color_r_g_b_a.html">00023</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> {
<a name="l00024"></a><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">00024</a> Uint8 <a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>;
<a name="l00025"></a><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">00025</a> Uint8 <a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>;
<a name="l00026"></a><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">00026</a> Uint8 <a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>;
<a name="l00027"></a><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">00027</a> Uint8 <a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>;
<a name="l00028"></a>00028 } <a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a>;
<a name="l00029"></a>00029
<a name="l00033"></a><a class="code" href="structt_color_y.html">00033</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structt_color_y.html" title="A 8bit Y/palette pixel.">tColorY</a> {
<a name="l00034"></a><a class="code" href="structt_color_y.html#ace61c93d341a0b154df0e9923558a537">00034</a> Uint8 <a class="code" href="structt_color_y.html#ace61c93d341a0b154df0e9923558a537">y</a>;
<a name="l00035"></a>00035 } <a class="code" href="structt_color_y.html" title="A 8bit Y/palette pixel.">tColorY</a>;
<a name="l00036"></a>00036
<a name="l00040"></a><a class="code" href="_s_d_l__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f">00040</a> <span class="preprocessor">#define MAX(a,b) (((a) > (b)) ? (a) : (b))</span>
<a name="l00041"></a>00041 <span class="preprocessor"></span>
<a name="l00052"></a><a class="code" href="_s_d_l__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb">00052</a> <span class="preprocessor">#define GUARD_ROWS (2)</span>
<a name="l00053"></a>00053 <span class="preprocessor"></span>
<a name="l00057"></a><a class="code" href="_s_d_l__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9">00057</a> <span class="preprocessor">#define VALUE_LIMIT 0.001</span>
<a name="l00058"></a>00058 <span class="preprocessor"></span>
<a name="l00062"></a><a class="code" href="_s_d_l__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce">00062</a> Uint32 <a class="code" href="_s_d_l__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce" title="Returns colorkey info for a surface.">_colorkey</a>(SDL_Surface *src)
<a name="l00063"></a>00063 {
<a name="l00064"></a>00064 Uint32 key = 0;
<a name="l00065"></a>00065 <span class="preprocessor">#if (SDL_MINOR_VERSION == 3)</span>
<a name="l00066"></a>00066 <span class="preprocessor"></span> SDL_GetColorKey(src, &key);
<a name="l00067"></a>00067 <span class="preprocessor">#else</span>
<a name="l00068"></a>00068 <span class="preprocessor"></span> <span class="keywordflow">if</span> (src)
<a name="l00069"></a>00069 {
<a name="l00070"></a>00070 key = src->format->colorkey;
<a name="l00071"></a>00071 }
<a name="l00072"></a>00072 <span class="preprocessor">#endif</span>
<a name="l00073"></a>00073 <span class="preprocessor"></span> <span class="keywordflow">return</span> key;
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075
<a name="l00076"></a>00076
<a name="l00092"></a><a class="code" href="_s_d_l__rotozoom_8c.html#ac1bde824f44ae9a76930e9782b783512">00092</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l__rotozoom_8c.html#ac1bde824f44ae9a76930e9782b783512" title="Internal 32 bit integer-factor averaging Shrinker.">_shrinkSurfaceRGBA</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> factorx, <span class="keywordtype">int</span> factory)
<a name="l00093"></a>00093 {
<a name="l00094"></a>00094 <span class="keywordtype">int</span> x, y, dx, dy, sgap, dgap, ra, ga, ba, aa;
<a name="l00095"></a>00095 <span class="keywordtype">int</span> n_average;
<a name="l00096"></a>00096 <a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *sp, *osp, *oosp;
<a name="l00097"></a>00097 <a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *dp;
<a name="l00098"></a>00098
<a name="l00099"></a>00099 <span class="comment">/*</span>
<a name="l00100"></a>00100 <span class="comment"> * Averaging integer shrink</span>
<a name="l00101"></a>00101 <span class="comment"> */</span>
<a name="l00102"></a>00102
<a name="l00103"></a>00103 <span class="comment">/* Precalculate division factor */</span>
<a name="l00104"></a>00104 n_average = factorx*factory;
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="comment">/*</span>
<a name="l00107"></a>00107 <span class="comment"> * Scan destination</span>
<a name="l00108"></a>00108 <span class="comment"> */</span>
<a name="l00109"></a>00109 sp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) src->pixels;
<a name="l00110"></a>00110 sgap = src->pitch - src->w * 4;
<a name="l00111"></a>00111
<a name="l00112"></a>00112 dp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) dst->pixels;
<a name="l00113"></a>00113 dgap = dst->pitch - dst->w * 4;
<a name="l00114"></a>00114
<a name="l00115"></a>00115 <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {
<a name="l00116"></a>00116
<a name="l00117"></a>00117 osp=sp;
<a name="l00118"></a>00118 <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {
<a name="l00119"></a>00119
<a name="l00120"></a>00120 <span class="comment">/* Trace out source box and accumulate */</span>
<a name="l00121"></a>00121 oosp=sp;
<a name="l00122"></a>00122 ra=ga=ba=aa=0;
<a name="l00123"></a>00123 <span class="keywordflow">for</span> (dy=0; dy < factory; dy++) {
<a name="l00124"></a>00124 <span class="keywordflow">for</span> (dx=0; dx < factorx; dx++) {
<a name="l00125"></a>00125 ra += sp-><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a>;
<a name="l00126"></a>00126 ga += sp-><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a>;
<a name="l00127"></a>00127 ba += sp-><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a>;
<a name="l00128"></a>00128 aa += sp-><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a>;
<a name="l00129"></a>00129
<a name="l00130"></a>00130 sp++;
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132 <span class="comment">/* src dx loop */</span>
<a name="l00133"></a>00133 sp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *)((Uint8*)sp + (src->pitch - 4*factorx)); <span class="comment">// next y</span>
<a name="l00134"></a>00134 }
<a name="l00135"></a>00135 <span class="comment">/* src dy loop */</span>
<a name="l00136"></a>00136
<a name="l00137"></a>00137 <span class="comment">/* next box-x */</span>
<a name="l00138"></a>00138 sp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *)((Uint8*)oosp + 4*factorx);
<a name="l00139"></a>00139
<a name="l00140"></a>00140 <span class="comment">/* Store result in destination */</span>
<a name="l00141"></a>00141 dp-><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> = ra/n_average;
<a name="l00142"></a>00142 dp-><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> = ga/n_average;
<a name="l00143"></a>00143 dp-><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> = ba/n_average;
<a name="l00144"></a>00144 dp-><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> = aa/n_average;
<a name="l00145"></a>00145
<a name="l00146"></a>00146 <span class="comment">/*</span>
<a name="l00147"></a>00147 <span class="comment"> * Advance destination pointer </span>
<a name="l00148"></a>00148 <span class="comment"> */</span>
<a name="l00149"></a>00149 dp++;
<a name="l00150"></a>00150 }
<a name="l00151"></a>00151 <span class="comment">/* dst x loop */</span>
<a name="l00152"></a>00152
<a name="l00153"></a>00153 <span class="comment">/* next box-y */</span>
<a name="l00154"></a>00154 sp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *)((Uint8*)osp + src->pitch*factory);
<a name="l00155"></a>00155
<a name="l00156"></a>00156 <span class="comment">/*</span>
<a name="l00157"></a>00157 <span class="comment"> * Advance destination pointers </span>
<a name="l00158"></a>00158 <span class="comment"> */</span>
<a name="l00159"></a>00159 dp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) ((Uint8 *) dp + dgap);
<a name="l00160"></a>00160 }
<a name="l00161"></a>00161 <span class="comment">/* dst y loop */</span>
<a name="l00162"></a>00162
<a name="l00163"></a>00163 <span class="keywordflow">return</span> (0);
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165
<a name="l00181"></a><a class="code" href="_s_d_l__rotozoom_8c.html#aadb38a61ab6727e5fd621b63418399be">00181</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l__rotozoom_8c.html#aadb38a61ab6727e5fd621b63418399be" title="Internal 8 bit integer-factor averaging shrinker.">_shrinkSurfaceY</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> factorx, <span class="keywordtype">int</span> factory)
<a name="l00182"></a>00182 {
<a name="l00183"></a>00183 <span class="keywordtype">int</span> x, y, dx, dy, sgap, dgap, a;
<a name="l00184"></a>00184 <span class="keywordtype">int</span> n_average;
<a name="l00185"></a>00185 Uint8 *sp, *osp, *oosp;
<a name="l00186"></a>00186 Uint8 *dp;
<a name="l00187"></a>00187
<a name="l00188"></a>00188 <span class="comment">/*</span>
<a name="l00189"></a>00189 <span class="comment"> * Averaging integer shrink</span>
<a name="l00190"></a>00190 <span class="comment"> */</span>
<a name="l00191"></a>00191
<a name="l00192"></a>00192 <span class="comment">/* Precalculate division factor */</span>
<a name="l00193"></a>00193 n_average = factorx*factory;
<a name="l00194"></a>00194
<a name="l00195"></a>00195 <span class="comment">/*</span>
<a name="l00196"></a>00196 <span class="comment"> * Scan destination</span>
<a name="l00197"></a>00197 <span class="comment"> */</span>
<a name="l00198"></a>00198 sp = (Uint8 *) src->pixels;
<a name="l00199"></a>00199 sgap = src->pitch - src->w;
<a name="l00200"></a>00200
<a name="l00201"></a>00201 dp = (Uint8 *) dst->pixels;
<a name="l00202"></a>00202 dgap = dst->pitch - dst->w;
<a name="l00203"></a>00203
<a name="l00204"></a>00204 <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {
<a name="l00205"></a>00205
<a name="l00206"></a>00206 osp=sp;
<a name="l00207"></a>00207 <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {
<a name="l00208"></a>00208
<a name="l00209"></a>00209 <span class="comment">/* Trace out source box and accumulate */</span>
<a name="l00210"></a>00210 oosp=sp;
<a name="l00211"></a>00211 a=0;
<a name="l00212"></a>00212 <span class="keywordflow">for</span> (dy=0; dy < factory; dy++) {
<a name="l00213"></a>00213 <span class="keywordflow">for</span> (dx=0; dx < factorx; dx++) {
<a name="l00214"></a>00214 a += (*sp);
<a name="l00215"></a>00215 <span class="comment">/* next x */</span>
<a name="l00216"></a>00216 sp++;
<a name="l00217"></a>00217 }
<a name="l00218"></a>00218 <span class="comment">/* end src dx loop */</span>
<a name="l00219"></a>00219 <span class="comment">/* next y */</span>
<a name="l00220"></a>00220 sp = (Uint8 *)((Uint8*)sp + (src->pitch - factorx));
<a name="l00221"></a>00221 }
<a name="l00222"></a>00222 <span class="comment">/* end src dy loop */</span>
<a name="l00223"></a>00223
<a name="l00224"></a>00224 <span class="comment">/* next box-x */</span>
<a name="l00225"></a>00225 sp = (Uint8 *)((Uint8*)oosp + factorx);
<a name="l00226"></a>00226
<a name="l00227"></a>00227 <span class="comment">/* Store result in destination */</span>
<a name="l00228"></a>00228 *dp = a/n_average;
<a name="l00229"></a>00229
<a name="l00230"></a>00230 <span class="comment">/*</span>
<a name="l00231"></a>00231 <span class="comment"> * Advance destination pointer </span>
<a name="l00232"></a>00232 <span class="comment"> */</span>
<a name="l00233"></a>00233 dp++;
<a name="l00234"></a>00234 }
<a name="l00235"></a>00235 <span class="comment">/* end dst x loop */</span>
<a name="l00236"></a>00236
<a name="l00237"></a>00237 <span class="comment">/* next box-y */</span>
<a name="l00238"></a>00238 sp = (Uint8 *)((Uint8*)osp + src->pitch*factory);
<a name="l00239"></a>00239
<a name="l00240"></a>00240 <span class="comment">/*</span>
<a name="l00241"></a>00241 <span class="comment"> * Advance destination pointers </span>
<a name="l00242"></a>00242 <span class="comment"> */</span>
<a name="l00243"></a>00243 dp = (Uint8 *)((Uint8 *)dp + dgap);
<a name="l00244"></a>00244 }
<a name="l00245"></a>00245 <span class="comment">/* end dst y loop */</span>
<a name="l00246"></a>00246
<a name="l00247"></a>00247 <span class="keywordflow">return</span> (0);
<a name="l00248"></a>00248 }
<a name="l00249"></a>00249
<a name="l00265"></a><a class="code" href="_s_d_l__rotozoom_8c.html#a9898b12bb565c4075c2da4db4891fd81">00265</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l__rotozoom_8c.html#a9898b12bb565c4075c2da4db4891fd81" title="Internal 32 bit Zoomer with optional anti-aliasing by bilinear interpolation.">_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)
<a name="l00266"></a>00266 {
<a name="l00267"></a>00267 <span class="keywordtype">int</span> x, y, sx, sy, *sax, *say, *csax, *csay, csx, csy, ex, ey, t1, t2, sstep, lx, ly;
<a name="l00268"></a>00268 <a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *c00, *c01, *c10, *c11, *cswap;
<a name="l00269"></a>00269 <a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *sp, *csp, *dp;
<a name="l00270"></a>00270 <span class="keywordtype">int</span> dgap;
<a name="l00271"></a>00271
<a name="l00272"></a>00272 <span class="comment">/*</span>
<a name="l00273"></a>00273 <span class="comment"> * Variable setup </span>
<a name="l00274"></a>00274 <span class="comment"> */</span>
<a name="l00275"></a>00275 <span class="keywordflow">if</span> (smooth) {
<a name="l00276"></a>00276 <span class="comment">/*</span>
<a name="l00277"></a>00277 <span class="comment"> * For interpolation: assume source dimension is one pixel </span>
<a name="l00278"></a>00278 <span class="comment"> * smaller to avoid overflow on right and bottom edge. </span>
<a name="l00279"></a>00279 <span class="comment"> */</span>
<a name="l00280"></a>00280 sx = (int) (65536.0 * (<span class="keywordtype">float</span>) (src->w - 1) / (<span class="keywordtype">float</span>) dst->w);
<a name="l00281"></a>00281 sy = (int) (65536.0 * (<span class="keywordtype">float</span>) (src->h - 1) / (<span class="keywordtype">float</span>) dst->h);
<a name="l00282"></a>00282 } <span class="keywordflow">else</span> {
<a name="l00283"></a>00283 sx = (int) (65536.0 * (<span class="keywordtype">float</span>) src->w / (float) dst->w);
<a name="l00284"></a>00284 sy = (int) (65536.0 * (<span class="keywordtype">float</span>) src->h / (float) dst->h);
<a name="l00285"></a>00285 }
<a name="l00286"></a>00286
<a name="l00287"></a>00287 <span class="comment">/*</span>
<a name="l00288"></a>00288 <span class="comment"> * Allocate memory for row increments </span>
<a name="l00289"></a>00289 <span class="comment"> */</span>
<a name="l00290"></a>00290 <span class="keywordflow">if</span> ((sax = (<span class="keywordtype">int</span> *) malloc((dst->w + 1) * <span class="keyword">sizeof</span>(Uint32))) == NULL) {
<a name="l00291"></a>00291 <span class="keywordflow">return</span> (-1);
<a name="l00292"></a>00292 }
<a name="l00293"></a>00293 <span class="keywordflow">if</span> ((say = (<span class="keywordtype">int</span> *) malloc((dst->h + 1) * <span class="keyword">sizeof</span>(Uint32))) == NULL) {
<a name="l00294"></a>00294 free(sax);
<a name="l00295"></a>00295 <span class="keywordflow">return</span> (-1);
<a name="l00296"></a>00296 }
<a name="l00297"></a>00297
<a name="l00298"></a>00298 <span class="comment">/*</span>
<a name="l00299"></a>00299 <span class="comment"> * Precalculate row increments </span>
<a name="l00300"></a>00300 <span class="comment"> */</span>
<a name="l00301"></a>00301 sp = csp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) src->pixels;
<a name="l00302"></a>00302 dp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) dst->pixels;
<a name="l00303"></a>00303
<a name="l00304"></a>00304 <span class="keywordflow">if</span> (flipx) csp += (src->w-1);
<a name="l00305"></a>00305 <span class="keywordflow">if</span> (flipy) csp += ((src->pitch/4)*(src->h-1));
<a name="l00306"></a>00306
<a name="l00307"></a>00307 csx = 0;
<a name="l00308"></a>00308 csax = sax;
<a name="l00309"></a>00309 <span class="keywordflow">for</span> (x = 0; x <= dst->w; x++) {
<a name="l00310"></a>00310 *csax = csx;
<a name="l00311"></a>00311 csax++;
<a name="l00312"></a>00312 csx &= 0xffff;
<a name="l00313"></a>00313 csx += sx;
<a name="l00314"></a>00314 }
<a name="l00315"></a>00315 csy = 0;
<a name="l00316"></a>00316 csay = say;
<a name="l00317"></a>00317 <span class="keywordflow">for</span> (y = 0; y <= dst->h; y++) {
<a name="l00318"></a>00318 *csay = csy;
<a name="l00319"></a>00319 csay++;
<a name="l00320"></a>00320 csy &= 0xffff;
<a name="l00321"></a>00321 csy += sy;
<a name="l00322"></a>00322 }
<a name="l00323"></a>00323
<a name="l00324"></a>00324 dgap = dst->pitch - dst->w * 4;
<a name="l00325"></a>00325
<a name="l00326"></a>00326 <span class="comment">/*</span>
<a name="l00327"></a>00327 <span class="comment"> * Switch between interpolating and non-interpolating code </span>
<a name="l00328"></a>00328 <span class="comment"> */</span>
<a name="l00329"></a>00329 <span class="keywordflow">if</span> (smooth) {
<a name="l00330"></a>00330
<a name="l00331"></a>00331 <span class="comment">/*</span>
<a name="l00332"></a>00332 <span class="comment"> * Interpolating Zoom </span>
<a name="l00333"></a>00333 <span class="comment"> */</span>
<a name="l00334"></a>00334
<a name="l00335"></a>00335 <span class="comment">/*</span>
<a name="l00336"></a>00336 <span class="comment"> * Scan destination </span>
<a name="l00337"></a>00337 <span class="comment"> */</span>
<a name="l00338"></a>00338 csay = say;
<a name="l00339"></a>00339 ly = 0;
<a name="l00340"></a>00340 <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {
<a name="l00341"></a>00341 <span class="comment">/*</span>
<a name="l00342"></a>00342 <span class="comment"> * Setup color source pointers </span>
<a name="l00343"></a>00343 <span class="comment"> */</span>
<a name="l00344"></a>00344 c00 = csp;
<a name="l00345"></a>00345 c01 = csp;
<a name="l00346"></a>00346 c01++;
<a name="l00347"></a>00347 c10 = csp;
<a name="l00348"></a>00348 c10 += src->pitch/4;
<a name="l00349"></a>00349 c11 = c10;
<a name="l00350"></a>00350 c11++;
<a name="l00351"></a>00351 <span class="keywordflow">if</span> (flipx) {
<a name="l00352"></a>00352 cswap = c00; c00=c01; c01=cswap;
<a name="l00353"></a>00353 cswap = c10; c10=c11; c11=cswap;
<a name="l00354"></a>00354 }
<a name="l00355"></a>00355 <span class="keywordflow">if</span> (flipy) {
<a name="l00356"></a>00356 cswap = c00; c00=c10; c10=cswap;
<a name="l00357"></a>00357 cswap = c01; c01=c11; c11=cswap;
<a name="l00358"></a>00358 }
<a name="l00359"></a>00359
<a name="l00360"></a>00360 csax = sax;
<a name="l00361"></a>00361 lx = 0;
<a name="l00362"></a>00362 <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {
<a name="l00363"></a>00363 <span class="comment">/*</span>
<a name="l00364"></a>00364 <span class="comment"> * Draw and interpolate colors </span>
<a name="l00365"></a>00365 <span class="comment"> */</span>
<a name="l00366"></a>00366 ex = (*csax & 0xffff);
<a name="l00367"></a>00367 ey = (*csay & 0xffff);
<a name="l00368"></a>00368 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;
<a name="l00369"></a>00369 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;
<a name="l00370"></a>00370 dp-><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> = (((t2 - t1) * ey) >> 16) + t1;
<a name="l00371"></a>00371 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;
<a name="l00372"></a>00372 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;
<a name="l00373"></a>00373 dp-><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> = (((t2 - t1) * ey) >> 16) + t1;
<a name="l00374"></a>00374 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;
<a name="l00375"></a>00375 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;
<a name="l00376"></a>00376 dp-><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> = (((t2 - t1) * ey) >> 16) + t1;
<a name="l00377"></a>00377 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;
<a name="l00378"></a>00378 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;
<a name="l00379"></a>00379 dp-><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> = (((t2 - t1) * ey) >> 16) + t1;
<a name="l00380"></a>00380
<a name="l00381"></a>00381 <span class="comment">/*</span>
<a name="l00382"></a>00382 <span class="comment"> * Advance source pointers </span>
<a name="l00383"></a>00383 <span class="comment"> */</span>
<a name="l00384"></a>00384 csax++;
<a name="l00385"></a>00385 <span class="keywordflow">if</span> (*csax > 0)
<a name="l00386"></a>00386 {
<a name="l00387"></a>00387 sstep = (*csax >> 16);
<a name="l00388"></a>00388 lx += sstep;
<a name="l00389"></a>00389 <span class="keywordflow">if</span> (flipx) sstep = -sstep;
<a name="l00390"></a>00390 <span class="keywordflow">if</span> (lx <= src->w)
<a name="l00391"></a>00391 {
<a name="l00392"></a>00392 c00 += sstep;
<a name="l00393"></a>00393 c01 += sstep;
<a name="l00394"></a>00394 c10 += sstep;
<a name="l00395"></a>00395 c11 += sstep;
<a name="l00396"></a>00396 }
<a name="l00397"></a>00397 }
<a name="l00398"></a>00398
<a name="l00399"></a>00399 <span class="comment">/*</span>
<a name="l00400"></a>00400 <span class="comment"> * Advance destination pointer </span>
<a name="l00401"></a>00401 <span class="comment"> */</span>
<a name="l00402"></a>00402 dp++;
<a name="l00403"></a>00403 }
<a name="l00404"></a>00404
<a name="l00405"></a>00405 <span class="comment">/*</span>
<a name="l00406"></a>00406 <span class="comment"> * Advance source pointer </span>
<a name="l00407"></a>00407 <span class="comment"> */</span>
<a name="l00408"></a>00408 csay++;
<a name="l00409"></a>00409 <span class="keywordflow">if</span> (*csay > 0)
<a name="l00410"></a>00410 {
<a name="l00411"></a>00411 sstep = (*csay >> 16);
<a name="l00412"></a>00412 ly += sstep;
<a name="l00413"></a>00413 <span class="keywordflow">if</span> (flipy) sstep = -sstep;
<a name="l00414"></a>00414 <span class="keywordflow">if</span> (ly < src->h)
<a name="l00415"></a>00415 {
<a name="l00416"></a>00416 csp += (sstep * (src->pitch/4));
<a name="l00417"></a>00417 }
<a name="l00418"></a>00418 }
<a name="l00419"></a>00419
<a name="l00420"></a>00420 <span class="comment">/*</span>
<a name="l00421"></a>00421 <span class="comment"> * Advance destination pointers </span>
<a name="l00422"></a>00422 <span class="comment"> */</span>
<a name="l00423"></a>00423 dp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) ((Uint8 *) dp + dgap);
<a name="l00424"></a>00424 }
<a name="l00425"></a>00425 } <span class="keywordflow">else</span> {
<a name="l00426"></a>00426
<a name="l00427"></a>00427 <span class="comment">/*</span>
<a name="l00428"></a>00428 <span class="comment"> * Non-Interpolating Zoom </span>
<a name="l00429"></a>00429 <span class="comment"> */</span>
<a name="l00430"></a>00430 csay = say;
<a name="l00431"></a>00431 <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {
<a name="l00432"></a>00432 sp = csp;
<a name="l00433"></a>00433 csax = sax;
<a name="l00434"></a>00434 <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {
<a name="l00435"></a>00435 <span class="comment">/*</span>
<a name="l00436"></a>00436 <span class="comment"> * Draw </span>
<a name="l00437"></a>00437 <span class="comment"> */</span>
<a name="l00438"></a>00438 *dp = *sp;
<a name="l00439"></a>00439 <span class="comment">/*</span>
<a name="l00440"></a>00440 <span class="comment"> * Advance source pointers </span>
<a name="l00441"></a>00441 <span class="comment"> */</span>
<a name="l00442"></a>00442 csax++;
<a name="l00443"></a>00443 <span class="keywordflow">if</span> (*csax > 0)
<a name="l00444"></a>00444 {
<a name="l00445"></a>00445 sstep = (*csax >> 16);
<a name="l00446"></a>00446 <span class="keywordflow">if</span> (flipx) sstep = -sstep;
<a name="l00447"></a>00447 sp += sstep;
<a name="l00448"></a>00448 }
<a name="l00449"></a>00449 <span class="comment">/*</span>
<a name="l00450"></a>00450 <span class="comment"> * Advance destination pointer </span>
<a name="l00451"></a>00451 <span class="comment"> */</span>
<a name="l00452"></a>00452 dp++;
<a name="l00453"></a>00453 }
<a name="l00454"></a>00454 <span class="comment">/*</span>
<a name="l00455"></a>00455 <span class="comment"> * Advance source pointer </span>
<a name="l00456"></a>00456 <span class="comment"> */</span>
<a name="l00457"></a>00457 csay++;
<a name="l00458"></a>00458 <span class="keywordflow">if</span> (*csay > 0)
<a name="l00459"></a>00459 {
<a name="l00460"></a>00460 sstep = (*csay >> 16) * (src->pitch/4);
<a name="l00461"></a>00461 <span class="keywordflow">if</span> (flipy) sstep = -sstep;
<a name="l00462"></a>00462 csp += sstep;
<a name="l00463"></a>00463 }
<a name="l00464"></a>00464
<a name="l00465"></a>00465 <span class="comment">/*</span>
<a name="l00466"></a>00466 <span class="comment"> * Advance destination pointers </span>
<a name="l00467"></a>00467 <span class="comment"> */</span>
<a name="l00468"></a>00468 dp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) ((Uint8 *) dp + dgap);
<a name="l00469"></a>00469 }
<a name="l00470"></a>00470 }
<a name="l00471"></a>00471
<a name="l00472"></a>00472 <span class="comment">/*</span>
<a name="l00473"></a>00473 <span class="comment"> * Remove temp arrays </span>
<a name="l00474"></a>00474 <span class="comment"> */</span>
<a name="l00475"></a>00475 free(sax);
<a name="l00476"></a>00476 free(say);
<a name="l00477"></a>00477
<a name="l00478"></a>00478 <span class="keywordflow">return</span> (0);
<a name="l00479"></a>00479 }
<a name="l00480"></a>00480
<a name="l00496"></a><a class="code" href="_s_d_l__rotozoom_8c.html#acfeb5a322cbb575f105f1762d9d21c29">00496</a> <span class="keywordtype">int</span> <a class="code" href="_s_d_l__rotozoom_8c.html#acfeb5a322cbb575f105f1762d9d21c29" title="Internal 8 bit Zoomer without smoothing.">_zoomSurfaceY</a>(SDL_Surface * src, SDL_Surface * dst, <span class="keywordtype">int</span> flipx, <span class="keywordtype">int</span> flipy)
<a name="l00497"></a>00497 {
<a name="l00498"></a>00498 <span class="keywordtype">int</span> x, y;
<a name="l00499"></a>00499 Uint32 *sax, *say, *csax, *csay;
<a name="l00500"></a>00500 <span class="keywordtype">int</span> csx, csy;
<a name="l00501"></a>00501 Uint8 *sp, *dp, *csp;
<a name="l00502"></a>00502 <span class="keywordtype">int</span> dgap;
<a name="l00503"></a>00503
<a name="l00504"></a>00504 <span class="comment">/*</span>
<a name="l00505"></a>00505 <span class="comment"> * Allocate memory for row increments </span>
<a name="l00506"></a>00506 <span class="comment"> */</span>
<a name="l00507"></a>00507 <span class="keywordflow">if</span> ((sax = (Uint32 *) malloc((dst->w + 1) * <span class="keyword">sizeof</span>(Uint32))) == NULL) {
<a name="l00508"></a>00508 <span class="keywordflow">return</span> (-1);
<a name="l00509"></a>00509 }
<a name="l00510"></a>00510 <span class="keywordflow">if</span> ((say = (Uint32 *) malloc((dst->h + 1) * <span class="keyword">sizeof</span>(Uint32))) == NULL) {
<a name="l00511"></a>00511 free(sax);
<a name="l00512"></a>00512 <span class="keywordflow">return</span> (-1);
<a name="l00513"></a>00513 }
<a name="l00514"></a>00514
<a name="l00515"></a>00515 <span class="comment">/*</span>
<a name="l00516"></a>00516 <span class="comment"> * Pointer setup </span>
<a name="l00517"></a>00517 <span class="comment"> */</span>
<a name="l00518"></a>00518 sp = csp = (Uint8 *) src->pixels;
<a name="l00519"></a>00519 dp = (Uint8 *) dst->pixels;
<a name="l00520"></a>00520 dgap = dst->pitch - dst->w;
<a name="l00521"></a>00521
<a name="l00522"></a>00522 <span class="keywordflow">if</span> (flipx) csp += (src->w-1);
<a name="l00523"></a>00523 <span class="keywordflow">if</span> (flipy) csp = ( (Uint8*)csp + src->pitch*(src->h-1) );
<a name="l00524"></a>00524
<a name="l00525"></a>00525 <span class="comment">/*</span>
<a name="l00526"></a>00526 <span class="comment"> * Precalculate row increments </span>
<a name="l00527"></a>00527 <span class="comment"> */</span>
<a name="l00528"></a>00528 csx = 0;
<a name="l00529"></a>00529 csax = sax;
<a name="l00530"></a>00530 <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {
<a name="l00531"></a>00531 csx += src->w;
<a name="l00532"></a>00532 *csax = 0;
<a name="l00533"></a>00533 <span class="keywordflow">while</span> (csx >= dst->w) {
<a name="l00534"></a>00534 csx -= dst->w;
<a name="l00535"></a>00535 (*csax)++;
<a name="l00536"></a>00536 }
<a name="l00537"></a>00537 csax++;
<a name="l00538"></a>00538 }
<a name="l00539"></a>00539 csy = 0;
<a name="l00540"></a>00540 csay = say;
<a name="l00541"></a>00541 <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {
<a name="l00542"></a>00542 csy += src->h;
<a name="l00543"></a>00543 *csay = 0;
<a name="l00544"></a>00544 <span class="keywordflow">while</span> (csy >= dst->h) {
<a name="l00545"></a>00545 csy -= dst->h;
<a name="l00546"></a>00546 (*csay)++;
<a name="l00547"></a>00547 }
<a name="l00548"></a>00548 csay++;
<a name="l00549"></a>00549 }
<a name="l00550"></a>00550
<a name="l00551"></a>00551 <span class="comment">/*</span>
<a name="l00552"></a>00552 <span class="comment"> * Draw </span>
<a name="l00553"></a>00553 <span class="comment"> */</span>
<a name="l00554"></a>00554 csay = say;
<a name="l00555"></a>00555 <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {
<a name="l00556"></a>00556 csax = sax;
<a name="l00557"></a>00557 sp = csp;
<a name="l00558"></a>00558 <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {
<a name="l00559"></a>00559 <span class="comment">/*</span>
<a name="l00560"></a>00560 <span class="comment"> * Draw </span>
<a name="l00561"></a>00561 <span class="comment"> */</span>
<a name="l00562"></a>00562 *dp = *sp;
<a name="l00563"></a>00563 <span class="comment">/*</span>
<a name="l00564"></a>00564 <span class="comment"> * Advance source pointers </span>
<a name="l00565"></a>00565 <span class="comment"> */</span>
<a name="l00566"></a>00566 sp += (*csax) * (flipx ? -1 : 1);
<a name="l00567"></a>00567 csax++;
<a name="l00568"></a>00568 <span class="comment">/*</span>
<a name="l00569"></a>00569 <span class="comment"> * Advance destination pointer </span>
<a name="l00570"></a>00570 <span class="comment"> */</span>
<a name="l00571"></a>00571 dp++;
<a name="l00572"></a>00572 }
<a name="l00573"></a>00573 <span class="comment">/*</span>
<a name="l00574"></a>00574 <span class="comment"> * Advance source pointer (for row) </span>
<a name="l00575"></a>00575 <span class="comment"> */</span>
<a name="l00576"></a>00576 csp += ((*csay) * src->pitch) * (flipy ? -1 : 1);
<a name="l00577"></a>00577 csay++;
<a name="l00578"></a>00578
<a name="l00579"></a>00579 <span class="comment">/*</span>
<a name="l00580"></a>00580 <span class="comment"> * Advance destination pointers </span>
<a name="l00581"></a>00581 <span class="comment"> */</span>
<a name="l00582"></a>00582 dp += dgap;
<a name="l00583"></a>00583 }
<a name="l00584"></a>00584
<a name="l00585"></a>00585 <span class="comment">/*</span>
<a name="l00586"></a>00586 <span class="comment"> * Remove temp arrays </span>
<a name="l00587"></a>00587 <span class="comment"> */</span>
<a name="l00588"></a>00588 free(sax);
<a name="l00589"></a>00589 free(say);
<a name="l00590"></a>00590
<a name="l00591"></a>00591 <span class="keywordflow">return</span> (0);
<a name="l00592"></a>00592 }
<a name="l00593"></a>00593
<a name="l00613"></a><a class="code" href="_s_d_l__rotozoom_8c.html#aae634e7b5e6ec1622fec361ecbd0d1b7">00613</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l__rotozoom_8c.html#aae634e7b5e6ec1622fec361ecbd0d1b7" title="Internal 32 bit rotozoomer with optional anti-aliasing.">_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)
<a name="l00614"></a>00614 {
<a name="l00615"></a>00615 <span class="keywordtype">int</span> x, y, t1, t2, dx, dy, xd, yd, sdx, sdy, ax, ay, ex, ey, sw, sh;
<a name="l00616"></a>00616 <a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> c00, c01, c10, c11, cswap;
<a name="l00617"></a>00617 <a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *pc, *sp;
<a name="l00618"></a>00618 <span class="keywordtype">int</span> gap;
<a name="l00619"></a>00619
<a name="l00620"></a>00620 <span class="comment">/*</span>
<a name="l00621"></a>00621 <span class="comment"> * Variable setup </span>
<a name="l00622"></a>00622 <span class="comment"> */</span>
<a name="l00623"></a>00623 xd = ((src->w - dst->w) << 15);
<a name="l00624"></a>00624 yd = ((src->h - dst->h) << 15);
<a name="l00625"></a>00625 ax = (cx << 16) - (icos * cx);
<a name="l00626"></a>00626 ay = (cy << 16) - (isin * cx);
<a name="l00627"></a>00627 sw = src->w - 1;
<a name="l00628"></a>00628 sh = src->h - 1;
<a name="l00629"></a>00629 pc = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a>*) dst->pixels;
<a name="l00630"></a>00630 gap = dst->pitch - dst->w * 4;
<a name="l00631"></a>00631
<a name="l00632"></a>00632 <span class="comment">/*</span>
<a name="l00633"></a>00633 <span class="comment"> * Switch between interpolating and non-interpolating code </span>
<a name="l00634"></a>00634 <span class="comment"> */</span>
<a name="l00635"></a>00635 if (smooth) {
<a name="l00636"></a>00636 <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {
<a name="l00637"></a>00637 dy = cy - y;
<a name="l00638"></a>00638 sdx = (ax + (isin * dy)) + xd;
<a name="l00639"></a>00639 sdy = (ay - (icos * dy)) + yd;
<a name="l00640"></a>00640 <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {
<a name="l00641"></a>00641 dx = (sdx >> 16);
<a name="l00642"></a>00642 dy = (sdy >> 16);
<a name="l00643"></a>00643 <span class="keywordflow">if</span> (flipx) dx = sw - dx;
<a name="l00644"></a>00644 <span class="keywordflow">if</span> (flipy) dy = sh - dy;
<a name="l00645"></a>00645 <span class="keywordflow">if</span> ((dx > -1) && (dy > -1) && (dx < (src->w-1)) && (dy < (src->h-1))) {
<a name="l00646"></a>00646 sp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *)src->pixels;;
<a name="l00647"></a>00647 sp += ((src->pitch/4) * dy);
<a name="l00648"></a>00648 sp += dx;
<a name="l00649"></a>00649 c00 = *sp;
<a name="l00650"></a>00650 sp += 1;
<a name="l00651"></a>00651 c01 = *sp;
<a name="l00652"></a>00652 sp += (src->pitch/4);
<a name="l00653"></a>00653 c11 = *sp;
<a name="l00654"></a>00654 sp -= 1;
<a name="l00655"></a>00655 c10 = *sp;
<a name="l00656"></a>00656 <span class="keywordflow">if</span> (flipx) {
<a name="l00657"></a>00657 cswap = c00; c00=c01; c01=cswap;
<a name="l00658"></a>00658 cswap = c10; c10=c11; c11=cswap;
<a name="l00659"></a>00659 }
<a name="l00660"></a>00660 <span class="keywordflow">if</span> (flipy) {
<a name="l00661"></a>00661 cswap = c00; c00=c10; c10=cswap;
<a name="l00662"></a>00662 cswap = c01; c01=c11; c11=cswap;
<a name="l00663"></a>00663 }
<a name="l00664"></a>00664 <span class="comment">/*</span>
<a name="l00665"></a>00665 <span class="comment"> * Interpolate colors </span>
<a name="l00666"></a>00666 <span class="comment"> */</span>
<a name="l00667"></a>00667 ex = (sdx & 0xffff);
<a name="l00668"></a>00668 ey = (sdy & 0xffff);
<a name="l00669"></a>00669 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;
<a name="l00670"></a>00670 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;
<a name="l00671"></a>00671 pc-><a class="code" href="structt_color_r_g_b_a.html#a91b464c8eae5ece8465e150e16086acd">r</a> = (((t2 - t1) * ey) >> 16) + t1;
<a name="l00672"></a>00672 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;
<a name="l00673"></a>00673 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;
<a name="l00674"></a>00674 pc-><a class="code" href="structt_color_r_g_b_a.html#ab4c6f97b95a6d0a8058a62eab9c78c43">g</a> = (((t2 - t1) * ey) >> 16) + t1;
<a name="l00675"></a>00675 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;
<a name="l00676"></a>00676 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;
<a name="l00677"></a>00677 pc-><a class="code" href="structt_color_r_g_b_a.html#a3d03a0372246e40434fc7a8a928c1e92">b</a> = (((t2 - t1) * ey) >> 16) + t1;
<a name="l00678"></a>00678 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;
<a name="l00679"></a>00679 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;
<a name="l00680"></a>00680 pc-><a class="code" href="structt_color_r_g_b_a.html#ababb728b2453c31cab11523817407956">a</a> = (((t2 - t1) * ey) >> 16) + t1;
<a name="l00681"></a>00681 }
<a name="l00682"></a>00682 sdx += icos;
<a name="l00683"></a>00683 sdy += isin;
<a name="l00684"></a>00684 pc++;
<a name="l00685"></a>00685 }
<a name="l00686"></a>00686 pc = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) ((Uint8 *) pc + gap);
<a name="l00687"></a>00687 }
<a name="l00688"></a>00688 } <span class="keywordflow">else</span> {
<a name="l00689"></a>00689 <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {
<a name="l00690"></a>00690 dy = cy - y;
<a name="l00691"></a>00691 sdx = (ax + (isin * dy)) + xd;
<a name="l00692"></a>00692 sdy = (ay - (icos * dy)) + yd;
<a name="l00693"></a>00693 <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {
<a name="l00694"></a>00694 dx = (short) (sdx >> 16);
<a name="l00695"></a>00695 dy = (short) (sdy >> 16);
<a name="l00696"></a>00696 <span class="keywordflow">if</span> (flipx) dx = (src->w-1)-dx;
<a name="l00697"></a>00697 <span class="keywordflow">if</span> (flipy) dy = (src->h-1)-dy;
<a name="l00698"></a>00698 <span class="keywordflow">if</span> ((dx >= 0) && (dy >= 0) && (dx < src->w) && (dy < src->h)) {
<a name="l00699"></a>00699 sp = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) ((Uint8 *) src->pixels + src->pitch * dy);
<a name="l00700"></a>00700 sp += dx;
<a name="l00701"></a>00701 *pc = *sp;
<a name="l00702"></a>00702 }
<a name="l00703"></a>00703 sdx += icos;
<a name="l00704"></a>00704 sdy += isin;
<a name="l00705"></a>00705 pc++;
<a name="l00706"></a>00706 }
<a name="l00707"></a>00707 pc = (<a class="code" href="structt_color_r_g_b_a.html" title="A 32 bit RGBA pixel.">tColorRGBA</a> *) ((Uint8 *) pc + gap);
<a name="l00708"></a>00708 }
<a name="l00709"></a>00709 }
<a name="l00710"></a>00710 }
<a name="l00711"></a>00711
<a name="l00730"></a><a class="code" href="_s_d_l__rotozoom_8c.html#a126e3b96b22cc18e78e33cc1f8eb6c3c">00730</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l__rotozoom_8c.html#a126e3b96b22cc18e78e33cc1f8eb6c3c" title="Rotates and zooms 8 bit palette/Y &#39;src&#39; surface to &#39;dst&#39; surface...">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)
<a name="l00731"></a>00731 {
<a name="l00732"></a>00732 <span class="keywordtype">int</span> x, y, dx, dy, xd, yd, sdx, sdy, ax, ay, sw, sh;
<a name="l00733"></a>00733 <a class="code" href="structt_color_y.html" title="A 8bit Y/palette pixel.">tColorY</a> *pc, *sp;
<a name="l00734"></a>00734 <span class="keywordtype">int</span> gap;
<a name="l00735"></a>00735
<a name="l00736"></a>00736 <span class="comment">/*</span>
<a name="l00737"></a>00737 <span class="comment"> * Variable setup </span>
<a name="l00738"></a>00738 <span class="comment"> */</span>
<a name="l00739"></a>00739 xd = ((src->w - dst->w) << 15);
<a name="l00740"></a>00740 yd = ((src->h - dst->h) << 15);
<a name="l00741"></a>00741 ax = (cx << 16) - (icos * cx);
<a name="l00742"></a>00742 ay = (cy << 16) - (isin * cx);
<a name="l00743"></a>00743 sw = src->w - 1;
<a name="l00744"></a>00744 sh = src->h - 1;
<a name="l00745"></a>00745 pc = (<a class="code" href="structt_color_y.html" title="A 8bit Y/palette pixel.">tColorY</a>*) dst->pixels;
<a name="l00746"></a>00746 gap = dst->pitch - dst->w;
<a name="l00747"></a>00747 <span class="comment">/*</span>
<a name="l00748"></a>00748 <span class="comment"> * Clear surface to colorkey </span>
<a name="l00749"></a>00749 <span class="comment"> */</span>
<a name="l00750"></a>00750 memset(pc, (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>) (<a class="code" href="_s_d_l__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce" title="Returns colorkey info for a surface.">_colorkey</a>(src) & 0xff), dst->pitch * dst->h);
<a name="l00751"></a>00751 <span class="comment">/*</span>
<a name="l00752"></a>00752 <span class="comment"> * Iterate through destination surface </span>
<a name="l00753"></a>00753 <span class="comment"> */</span>
<a name="l00754"></a>00754 <span class="keywordflow">for</span> (y = 0; y < dst->h; y++) {
<a name="l00755"></a>00755 dy = cy - y;
<a name="l00756"></a>00756 sdx = (ax + (isin * dy)) + xd;
<a name="l00757"></a>00757 sdy = (ay - (icos * dy)) + yd;
<a name="l00758"></a>00758 <span class="keywordflow">for</span> (x = 0; x < dst->w; x++) {
<a name="l00759"></a>00759 dx = (short) (sdx >> 16);
<a name="l00760"></a>00760 dy = (short) (sdy >> 16);
<a name="l00761"></a>00761 <span class="keywordflow">if</span> (flipx) dx = (src->w-1)-dx;
<a name="l00762"></a>00762 <span class="keywordflow">if</span> (flipy) dy = (src->h-1)-dy;
<a name="l00763"></a>00763 <span class="keywordflow">if</span> ((dx >= 0) && (dy >= 0) && (dx < src->w) && (dy < src->h)) {
<a name="l00764"></a>00764 sp = (<a class="code" href="structt_color_y.html" title="A 8bit Y/palette pixel.">tColorY</a> *) (src->pixels);
<a name="l00765"></a>00765 sp += (src->pitch * dy + dx);
<a name="l00766"></a>00766 *pc = *sp;
<a name="l00767"></a>00767 }
<a name="l00768"></a>00768 sdx += icos;
<a name="l00769"></a>00769 sdy += isin;
<a name="l00770"></a>00770 pc++;
<a name="l00771"></a>00771 }
<a name="l00772"></a>00772 pc += gap;
<a name="l00773"></a>00773 }
<a name="l00774"></a>00774 }
<a name="l00775"></a>00775
<a name="l00789"></a><a class="code" href="_s_d_l__rotozoom_8h.html#ac06e9fa4fce6a1dbae45462529be581e">00789</a> SDL_Surface* <a class="code" href="_s_d_l__rotozoom_8c.html#a77563d68634cb2624d4f2f0bcdc19e73" title="Rotates a 32 bit surface in increments of 90 degrees.">rotateSurface90Degrees</a>(SDL_Surface* src, <span class="keywordtype">int</span> numClockwiseTurns)
<a name="l00790"></a>00790 {
<a name="l00791"></a>00791 <span class="keywordtype">int</span> row, col, newWidth, newHeight;
<a name="l00792"></a>00792 <span class="keywordtype">int</span> bpp, src_ipr, dst_ipr;
<a name="l00793"></a>00793 SDL_Surface* dst;
<a name="l00794"></a>00794 Uint32* srcBuf;
<a name="l00795"></a>00795 Uint32* dstBuf;
<a name="l00796"></a>00796
<a name="l00797"></a>00797 <span class="comment">/* Has to be a valid surface pointer and only 32-bit surfaces (for now) */</span>
<a name="l00798"></a>00798 <span class="keywordflow">if</span> (!src || src->format->BitsPerPixel != 32) { <span class="keywordflow">return</span> NULL; }
<a name="l00799"></a>00799
<a name="l00800"></a>00800 <span class="comment">/* normalize numClockwiseTurns */</span>
<a name="l00801"></a>00801 <span class="keywordflow">while</span>(numClockwiseTurns < 0) { numClockwiseTurns += 4; }
<a name="l00802"></a>00802 numClockwiseTurns = (numClockwiseTurns % 4);
<a name="l00803"></a>00803
<a name="l00804"></a>00804 <span class="comment">/* if it's even, our new width will be the same as the source surface */</span>
<a name="l00805"></a>00805 newWidth = (numClockwiseTurns % 2) ? (src->h) : (src->w);
<a name="l00806"></a>00806 newHeight = (numClockwiseTurns % 2) ? (src->w) : (src->h);
<a name="l00807"></a>00807 dst = SDL_CreateRGBSurface( src->flags, newWidth, newHeight, src->format->BitsPerPixel,
<a name="l00808"></a>00808 src->format->Rmask,
<a name="l00809"></a>00809 src->format->Gmask,
<a name="l00810"></a>00810 src->format->Bmask,
<a name="l00811"></a>00811 src->format->Amask);
<a name="l00812"></a>00812 <span class="keywordflow">if</span>(!dst) {
<a name="l00813"></a>00813 <span class="keywordflow">return</span> NULL;
<a name="l00814"></a>00814 }
<a name="l00815"></a>00815
<a name="l00816"></a>00816 <span class="keywordflow">if</span> (SDL_MUSTLOCK(dst)) {
<a name="l00817"></a>00817 SDL_LockSurface(dst);
<a name="l00818"></a>00818 }
<a name="l00819"></a>00819 <span class="keywordflow">if</span> (SDL_MUSTLOCK(dst)) {
<a name="l00820"></a>00820 SDL_LockSurface(dst);
<a name="l00821"></a>00821 }
<a name="l00822"></a>00822
<a name="l00823"></a>00823 <span class="comment">/* Calculate int-per-row */</span>
<a name="l00824"></a>00824 bpp = src->format->BitsPerPixel / 8;
<a name="l00825"></a>00825 src_ipr = src->pitch / bpp;
<a name="l00826"></a>00826 dst_ipr = dst->pitch / bpp;
<a name="l00827"></a>00827
<a name="l00828"></a>00828 <span class="keywordflow">switch</span>(numClockwiseTurns) {
<a name="l00829"></a>00829 <span class="keywordflow">case</span> 0: <span class="comment">/* Make a copy of the surface */</span>
<a name="l00830"></a>00830 {
<a name="l00831"></a>00831 <span class="comment">/* Unfortunately SDL_BlitSurface cannot be used to make a copy of the surface</span>
<a name="l00832"></a>00832 <span class="comment"> since it does not preserve alpha. */</span>
<a name="l00833"></a>00833
<a name="l00834"></a>00834 <span class="keywordflow">if</span> (src->pitch == dst->pitch) {
<a name="l00835"></a>00835 <span class="comment">/* If the pitch is the same for both surfaces, the memory can be copied all at once. */</span>
<a name="l00836"></a>00836 memcpy(dst->pixels, src->pixels, (src->h * src->pitch));
<a name="l00837"></a>00837 }
<a name="l00838"></a>00838 <span class="keywordflow">else</span>
<a name="l00839"></a>00839 {
<a name="l00840"></a>00840 <span class="comment">/* If the pitch differs, copy each row separately */</span>
<a name="l00841"></a>00841 srcBuf = (Uint32*)(src->pixels);
<a name="l00842"></a>00842 dstBuf = (Uint32*)(dst->pixels);
<a name="l00843"></a>00843 <span class="keywordflow">for</span> (row = 0; row < src->h; row++) {
<a name="l00844"></a>00844 memcpy(dstBuf, srcBuf, dst->w * bpp);
<a name="l00845"></a>00845 srcBuf += src_ipr;
<a name="l00846"></a>00846 dstBuf += dst_ipr;
<a name="l00847"></a>00847 } <span class="comment">/* end for(col) */</span>
<a name="l00848"></a>00848 } <span class="comment">/* end for(row) */</span>
<a name="l00849"></a>00849 }
<a name="l00850"></a>00850 <span class="keywordflow">break</span>;
<a name="l00851"></a>00851
<a name="l00852"></a>00852 <span class="comment">/* rotate clockwise */</span>
<a name="l00853"></a>00853 <span class="keywordflow">case</span> 1: <span class="comment">/* rotated 90 degrees clockwise */</span>
<a name="l00854"></a>00854 {
<a name="l00855"></a>00855 <span class="keywordflow">for</span> (row = 0; row < src->h; ++row) {
<a name="l00856"></a>00856 srcBuf = (Uint32*)(src->pixels) + (row * src_ipr);
<a name="l00857"></a>00857 dstBuf = (Uint32*)(dst->pixels) + (dst->w - row - 1);
<a name="l00858"></a>00858 <span class="keywordflow">for</span> (col = 0; col < src->w; ++col) {
<a name="l00859"></a>00859 *dstBuf = *srcBuf;
<a name="l00860"></a>00860 ++srcBuf;
<a name="l00861"></a>00861 dstBuf += dst_ipr;
<a name="l00862"></a>00862 }
<a name="l00863"></a>00863 <span class="comment">/* end for(col) */</span>
<a name="l00864"></a>00864 }
<a name="l00865"></a>00865 <span class="comment">/* end for(row) */</span>
<a name="l00866"></a>00866 }
<a name="l00867"></a>00867 <span class="keywordflow">break</span>;
<a name="l00868"></a>00868
<a name="l00869"></a>00869 <span class="keywordflow">case</span> 2: <span class="comment">/* rotated 180 degrees clockwise */</span>
<a name="l00870"></a>00870 {
<a name="l00871"></a>00871 <span class="keywordflow">for</span> (row = 0; row < src->h; ++row) {
<a name="l00872"></a>00872 srcBuf = (Uint32*)(src->pixels) + (row * src_ipr);
<a name="l00873"></a>00873 dstBuf = (Uint32*)(dst->pixels) + ((dst->h - row - 1) * dst_ipr) + (dst->w - 1);
<a name="l00874"></a>00874 <span class="keywordflow">for</span> (col = 0; col < src->w; ++col) {
<a name="l00875"></a>00875 *dstBuf = *srcBuf;
<a name="l00876"></a>00876 ++srcBuf;
<a name="l00877"></a>00877 --dstBuf;
<a name="l00878"></a>00878 }
<a name="l00879"></a>00879 }
<a name="l00880"></a>00880 }
<a name="l00881"></a>00881 <span class="keywordflow">break</span>;
<a name="l00882"></a>00882
<a name="l00883"></a>00883 <span class="keywordflow">case</span> 3:
<a name="l00884"></a>00884 {
<a name="l00885"></a>00885 <span class="keywordflow">for</span> (row = 0; row < src->h; ++row) {
<a name="l00886"></a>00886 srcBuf = (Uint32*)(src->pixels) + (row * src_ipr);
<a name="l00887"></a>00887 dstBuf = (Uint32*)(dst->pixels) + row + ((dst->h - 1) * dst_ipr);
<a name="l00888"></a>00888 <span class="keywordflow">for</span> (col = 0; col < src->w; ++col) {
<a name="l00889"></a>00889 *dstBuf = *srcBuf;
<a name="l00890"></a>00890 ++srcBuf;
<a name="l00891"></a>00891 dstBuf -= dst_ipr;
<a name="l00892"></a>00892 }
<a name="l00893"></a>00893 }
<a name="l00894"></a>00894 }
<a name="l00895"></a>00895 <span class="keywordflow">break</span>;
<a name="l00896"></a>00896 }
<a name="l00897"></a>00897 <span class="comment">/* end switch */</span>
<a name="l00898"></a>00898
<a name="l00899"></a>00899 <span class="keywordflow">if</span> (SDL_MUSTLOCK(src)) {
<a name="l00900"></a>00900 SDL_UnlockSurface(src);
<a name="l00901"></a>00901 }
<a name="l00902"></a>00902 <span class="keywordflow">if</span> (SDL_MUSTLOCK(dst)) {
<a name="l00903"></a>00903 SDL_UnlockSurface(dst);
<a name="l00904"></a>00904 }
<a name="l00905"></a>00905
<a name="l00906"></a>00906 <span class="keywordflow">return</span> dst;
<a name="l00907"></a>00907 }
<a name="l00908"></a>00908
<a name="l00909"></a>00909
<a name="l00924"></a><a class="code" href="_s_d_l__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8">00924</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8" title="Internal target surface sizing function for rotozooms with trig result return.">_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,
<a name="l00925"></a>00925 <span class="keywordtype">int</span> *dstwidth, <span class="keywordtype">int</span> *dstheight,
<a name="l00926"></a>00926 <span class="keywordtype">double</span> *canglezoom, <span class="keywordtype">double</span> *sanglezoom)
<a name="l00927"></a>00927 {
<a name="l00928"></a>00928 <span class="keywordtype">double</span> x, y, cx, cy, sx, sy;
<a name="l00929"></a>00929 <span class="keywordtype">double</span> radangle;
<a name="l00930"></a>00930 <span class="keywordtype">int</span> dstwidthhalf, dstheighthalf;
<a name="l00931"></a>00931
<a name="l00932"></a>00932 <span class="comment">/*</span>
<a name="l00933"></a>00933 <span class="comment"> * Determine destination width and height by rotating a centered source box </span>
<a name="l00934"></a>00934 <span class="comment"> */</span>
<a name="l00935"></a>00935 radangle = angle * (M_PI / 180.0);
<a name="l00936"></a>00936 *sanglezoom = sin(radangle);
<a name="l00937"></a>00937 *canglezoom = cos(radangle);
<a name="l00938"></a>00938 *sanglezoom *= zoomx;
<a name="l00939"></a>00939 *canglezoom *= zoomx;
<a name="l00940"></a>00940 x = width / 2;
<a name="l00941"></a>00941 y = height / 2;
<a name="l00942"></a>00942 cx = *canglezoom * x;
<a name="l00943"></a>00943 cy = *canglezoom * y;
<a name="l00944"></a>00944 sx = *sanglezoom * x;
<a name="l00945"></a>00945 sy = *sanglezoom * y;
<a name="l00946"></a>00946
<a name="l00947"></a>00947 dstwidthhalf = <a class="code" href="_s_d_l__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>((<span class="keywordtype">int</span>)
<a name="l00948"></a>00948 ceil(<a class="code" href="_s_d_l__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>(<a class="code" href="_s_d_l__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>(<a class="code" href="_s_d_l__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>(fabs(cx + sy), fabs(cx - sy)), fabs(-cx + sy)), fabs(-cx - sy))), 1);
<a name="l00949"></a>00949 dstheighthalf = <a class="code" href="_s_d_l__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>((<span class="keywordtype">int</span>)
<a name="l00950"></a>00950 ceil(<a class="code" href="_s_d_l__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>(<a class="code" href="_s_d_l__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>(<a class="code" href="_s_d_l__rotozoom_8c.html#afa99ec4acc4ecb2dc3c2d05da15d0e3f" title="Returns maximum of two numbers a and b.">MAX</a>(fabs(sx + cy), fabs(sx - cy)), fabs(-sx + cy)), fabs(-sx - cy))), 1);
<a name="l00951"></a>00951 *dstwidth = 2 * dstwidthhalf;
<a name="l00952"></a>00952 *dstheight = 2 * dstheighthalf;
<a name="l00953"></a>00953 }
<a name="l00954"></a>00954
<a name="l00966"></a><a class="code" href="_s_d_l__rotozoom_8h.html#a612334fa642f672af953f544da6245d0">00966</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l__rotozoom_8c.html#aee64992d26c818d9975610754d5c929b" title="Returns the size of the resulting target surface for a rotozoomSurfaceXY() call.">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)
<a name="l00967"></a>00967 {
<a name="l00968"></a>00968 <span class="keywordtype">double</span> dummy_sanglezoom, dummy_canglezoom;
<a name="l00969"></a>00969
<a name="l00970"></a>00970 <a class="code" href="_s_d_l__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8" title="Internal target surface sizing function for rotozooms with trig result return.">_rotozoomSurfaceSizeTrig</a>(width, height, angle, zoomx, zoomy, dstwidth, dstheight, &dummy_sanglezoom, &dummy_canglezoom);
<a name="l00971"></a>00971 }
<a name="l00972"></a>00972
<a name="l00983"></a><a class="code" href="_s_d_l__rotozoom_8h.html#a3ca2316375d6faf4f19b26c2f1f14bbc">00983</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l__rotozoom_8c.html#a9886c783255edfd70a4974f8f3dd5a8c" title="Returns the size of the resulting target surface for a rotozoomSurface() call.">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)
<a name="l00984"></a>00984 {
<a name="l00985"></a>00985 <span class="keywordtype">double</span> dummy_sanglezoom, dummy_canglezoom;
<a name="l00986"></a>00986
<a name="l00987"></a>00987 <a class="code" href="_s_d_l__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8" title="Internal target surface sizing function for rotozooms with trig result return.">_rotozoomSurfaceSizeTrig</a>(width, height, angle, zoom, zoom, dstwidth, dstheight, &dummy_sanglezoom, &dummy_canglezoom);
<a name="l00988"></a>00988 }
<a name="l00989"></a>00989
<a name="l01005"></a><a class="code" href="_s_d_l__rotozoom_8h.html#a3cb0c11d5edc929579c807dc7612348c">01005</a> SDL_Surface *<a class="code" href="_s_d_l__rotozoom_8c.html#a5f64ed53eeee5f2667971c857698d1e5" title="Rotates and zooms a surface and optional anti-aliasing.">rotozoomSurface</a>(SDL_Surface * src, <span class="keywordtype">double</span> angle, <span class="keywordtype">double</span> zoom, <span class="keywordtype">int</span> smooth)
<a name="l01006"></a>01006 {
<a name="l01007"></a>01007 <span class="keywordflow">return</span> <a class="code" href="_s_d_l__rotozoom_8c.html#aab98b5b0da4ea468bacf47f7b85f0ee2" title="Rotates and zooms a surface with different horizontal and vertival scaling factors...">rotozoomSurfaceXY</a>(src, angle, zoom, zoom, smooth);
<a name="l01008"></a>01008 }
<a name="l01009"></a>01009
<a name="l01026"></a><a class="code" href="_s_d_l__rotozoom_8h.html#a454d4234a45eab6ec238a40cc44051d4">01026</a> SDL_Surface *<a class="code" href="_s_d_l__rotozoom_8c.html#aab98b5b0da4ea468bacf47f7b85f0ee2" title="Rotates and zooms a surface with different horizontal and vertival scaling factors...">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)
<a name="l01027"></a>01027 {
<a name="l01028"></a>01028 SDL_Surface *rz_src;
<a name="l01029"></a>01029 SDL_Surface *rz_dst;
<a name="l01030"></a>01030 <span class="keywordtype">double</span> zoominv;
<a name="l01031"></a>01031 <span class="keywordtype">double</span> sanglezoom, canglezoom, sanglezoominv, canglezoominv;
<a name="l01032"></a>01032 <span class="keywordtype">int</span> dstwidthhalf, dstwidth, dstheighthalf, dstheight;
<a name="l01033"></a>01033 <span class="keywordtype">int</span> is32bit;
<a name="l01034"></a>01034 <span class="keywordtype">int</span> i, src_converted;
<a name="l01035"></a>01035 <span class="keywordtype">int</span> flipx,flipy;
<a name="l01036"></a>01036 Uint8 r,g,b;
<a name="l01037"></a>01037 Uint32 colorkey = 0;
<a name="l01038"></a>01038 <span class="keywordtype">int</span> colorKeyAvailable = 0;
<a name="l01039"></a>01039
<a name="l01040"></a>01040 <span class="comment">/*</span>
<a name="l01041"></a>01041 <span class="comment"> * Sanity check </span>
<a name="l01042"></a>01042 <span class="comment"> */</span>
<a name="l01043"></a>01043 <span class="keywordflow">if</span> (src == NULL)
<a name="l01044"></a>01044 <span class="keywordflow">return</span> (NULL);
<a name="l01045"></a>01045
<a name="l01046"></a>01046 <span class="keywordflow">if</span> (src->flags & SDL_SRCCOLORKEY)
<a name="l01047"></a>01047 {
<a name="l01048"></a>01048 colorkey = <a class="code" href="_s_d_l__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce" title="Returns colorkey info for a surface.">_colorkey</a>(src);
<a name="l01049"></a>01049 SDL_GetRGB(colorkey, src->format, &r, &g, &b);
<a name="l01050"></a>01050 colorKeyAvailable = 1;
<a name="l01051"></a>01051 }
<a name="l01052"></a>01052 <span class="comment">/*</span>
<a name="l01053"></a>01053 <span class="comment"> * Determine if source surface is 32bit or 8bit </span>
<a name="l01054"></a>01054 <span class="comment"> */</span>
<a name="l01055"></a>01055 is32bit = (src->format->BitsPerPixel == 32);
<a name="l01056"></a>01056 <span class="keywordflow">if</span> ((is32bit) || (src->format->BitsPerPixel == 8)) {
<a name="l01057"></a>01057 <span class="comment">/*</span>
<a name="l01058"></a>01058 <span class="comment"> * Use source surface 'as is' </span>
<a name="l01059"></a>01059 <span class="comment"> */</span>
<a name="l01060"></a>01060 rz_src = src;
<a name="l01061"></a>01061 src_converted = 0;
<a name="l01062"></a>01062 } <span class="keywordflow">else</span> {
<a name="l01063"></a>01063 <span class="comment">/*</span>
<a name="l01064"></a>01064 <span class="comment"> * New source surface is 32bit with a defined RGBA ordering </span>
<a name="l01065"></a>01065 <span class="comment"> */</span>
<a name="l01066"></a>01066 rz_src =
<a name="l01067"></a>01067 SDL_CreateRGBSurface(SDL_SWSURFACE, src->w, src->h, 32,
<a name="l01068"></a>01068 #<span class="keywordflow">if</span> SDL_BYTEORDER == SDL_LIL_ENDIAN
<a name="l01069"></a>01069 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
<a name="l01070"></a>01070 #<span class="keywordflow">else</span>
<a name="l01071"></a>01071 0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff
<a name="l01072"></a>01072 #endif
<a name="l01073"></a>01073 );
<a name="l01074"></a>01074 <span class="keywordflow">if</span>(colorKeyAvailable)
<a name="l01075"></a>01075 SDL_SetColorKey(src, 0, 0);
<a name="l01076"></a>01076
<a name="l01077"></a>01077 SDL_BlitSurface(src, NULL, rz_src, NULL);
<a name="l01078"></a>01078
<a name="l01079"></a>01079 <span class="keywordflow">if</span>(colorKeyAvailable)
<a name="l01080"></a>01080 SDL_SetColorKey(src, SDL_SRCCOLORKEY, colorkey);
<a name="l01081"></a>01081 src_converted = 1;
<a name="l01082"></a>01082 is32bit = 1;
<a name="l01083"></a>01083 }
<a name="l01084"></a>01084
<a name="l01085"></a>01085 <span class="comment">/*</span>
<a name="l01086"></a>01086 <span class="comment"> * Sanity check zoom factor </span>
<a name="l01087"></a>01087 <span class="comment"> */</span>
<a name="l01088"></a>01088 flipx = (zoomx<0.0);
<a name="l01089"></a>01089 <span class="keywordflow">if</span> (flipx) zoomx=-zoomx;
<a name="l01090"></a>01090 flipy = (zoomy<0.0);
<a name="l01091"></a>01091 <span class="keywordflow">if</span> (flipy) zoomy=-zoomy;
<a name="l01092"></a>01092 <span class="keywordflow">if</span> (zoomx < <a class="code" href="_s_d_l__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>) zoomx = <a class="code" href="_s_d_l__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>;
<a name="l01093"></a>01093 <span class="keywordflow">if</span> (zoomy < <a class="code" href="_s_d_l__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>) zoomy = <a class="code" href="_s_d_l__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>;
<a name="l01094"></a>01094 zoominv = 65536.0 / (zoomx * zoomx);
<a name="l01095"></a>01095
<a name="l01096"></a>01096 <span class="comment">/*</span>
<a name="l01097"></a>01097 <span class="comment"> * Check if we have a rotozoom or just a zoom </span>
<a name="l01098"></a>01098 <span class="comment"> */</span>
<a name="l01099"></a>01099 <span class="keywordflow">if</span> (fabs(angle) > <a class="code" href="_s_d_l__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>) {
<a name="l01100"></a>01100
<a name="l01101"></a>01101 <span class="comment">/*</span>
<a name="l01102"></a>01102 <span class="comment"> * Angle!=0: full rotozoom </span>
<a name="l01103"></a>01103 <span class="comment"> */</span>
<a name="l01104"></a>01104 <span class="comment">/*</span>
<a name="l01105"></a>01105 <span class="comment"> * ----------------------- </span>
<a name="l01106"></a>01106 <span class="comment"> */</span>
<a name="l01107"></a>01107
<a name="l01108"></a>01108 <span class="comment">/* Determine target size */</span>
<a name="l01109"></a>01109 <a class="code" href="_s_d_l__rotozoom_8c.html#af48638a298820d4d1dd24a13896963d8" title="Internal target surface sizing function for rotozooms with trig result return.">_rotozoomSurfaceSizeTrig</a>(rz_src->w, rz_src->h, angle, zoomx, zoomy, &dstwidth, &dstheight, &canglezoom, &sanglezoom);
<a name="l01110"></a>01110
<a name="l01111"></a>01111 <span class="comment">/*</span>
<a name="l01112"></a>01112 <span class="comment"> * Calculate target factors from sin/cos and zoom </span>
<a name="l01113"></a>01113 <span class="comment"> */</span>
<a name="l01114"></a>01114 sanglezoominv = sanglezoom;
<a name="l01115"></a>01115 canglezoominv = canglezoom;
<a name="l01116"></a>01116 sanglezoominv *= zoominv;
<a name="l01117"></a>01117 canglezoominv *= zoominv;
<a name="l01118"></a>01118
<a name="l01119"></a>01119 <span class="comment">/* Calculate half size */</span>
<a name="l01120"></a>01120 dstwidthhalf = dstwidth / 2;
<a name="l01121"></a>01121 dstheighthalf = dstheight / 2;
<a name="l01122"></a>01122
<a name="l01123"></a>01123 <span class="comment">/*</span>
<a name="l01124"></a>01124 <span class="comment"> * Alloc space to completely contain the rotated surface </span>
<a name="l01125"></a>01125 <span class="comment"> */</span>
<a name="l01126"></a>01126 rz_dst = NULL;
<a name="l01127"></a>01127 <span class="keywordflow">if</span> (is32bit) {
<a name="l01128"></a>01128 <span class="comment">/*</span>
<a name="l01129"></a>01129 <span class="comment"> * Target surface is 32bit with source RGBA/ABGR ordering </span>
<a name="l01130"></a>01130 <span class="comment"> */</span>
<a name="l01131"></a>01131 rz_dst =
<a name="l01132"></a>01132 SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 32,
<a name="l01133"></a>01133 rz_src->format->Rmask, rz_src->format->Gmask,
<a name="l01134"></a>01134 rz_src->format->Bmask, rz_src->format->Amask);
<a name="l01135"></a>01135 } <span class="keywordflow">else</span> {
<a name="l01136"></a>01136 <span class="comment">/*</span>
<a name="l01137"></a>01137 <span class="comment"> * Target surface is 8bit </span>
<a name="l01138"></a>01138 <span class="comment"> */</span>
<a name="l01139"></a>01139 rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 8, 0, 0, 0, 0);
<a name="l01140"></a>01140 }
<a name="l01141"></a>01141
<a name="l01142"></a>01142 <span class="comment">/* Check target */</span>
<a name="l01143"></a>01143 <span class="keywordflow">if</span> (rz_dst == NULL)
<a name="l01144"></a>01144 <span class="keywordflow">return</span> NULL;
<a name="l01145"></a>01145
<a name="l01146"></a>01146 <span class="comment">/* Adjust for guard rows */</span>
<a name="l01147"></a>01147 rz_dst->h = dstheight;
<a name="l01148"></a>01148
<a name="l01149"></a>01149 <span class="keywordflow">if</span> (colorKeyAvailable == 1){
<a name="l01150"></a>01150 colorkey = SDL_MapRGB(rz_dst->format, r, g, b);
<a name="l01151"></a>01151
<a name="l01152"></a>01152 SDL_FillRect(rz_dst, NULL, colorkey );
<a name="l01153"></a>01153 }
<a name="l01154"></a>01154
<a name="l01155"></a>01155 <span class="comment">/*</span>
<a name="l01156"></a>01156 <span class="comment"> * Lock source surface </span>
<a name="l01157"></a>01157 <span class="comment"> */</span>
<a name="l01158"></a>01158 <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01159"></a>01159 SDL_LockSurface(rz_src);
<a name="l01160"></a>01160 }
<a name="l01161"></a>01161
<a name="l01162"></a>01162 <span class="comment">/*</span>
<a name="l01163"></a>01163 <span class="comment"> * Check which kind of surface we have </span>
<a name="l01164"></a>01164 <span class="comment"> */</span>
<a name="l01165"></a>01165 <span class="keywordflow">if</span> (is32bit) {
<a name="l01166"></a>01166 <span class="comment">/*</span>
<a name="l01167"></a>01167 <span class="comment"> * Call the 32bit transformation routine to do the rotation (using alpha) </span>
<a name="l01168"></a>01168 <span class="comment"> */</span>
<a name="l01169"></a>01169 <a class="code" href="_s_d_l__rotozoom_8c.html#aae634e7b5e6ec1622fec361ecbd0d1b7" title="Internal 32 bit rotozoomer with optional anti-aliasing.">_transformSurfaceRGBA</a>(rz_src, rz_dst, dstwidthhalf, dstheighthalf,
<a name="l01170"></a>01170 (<span class="keywordtype">int</span>) (sanglezoominv), (<span class="keywordtype">int</span>) (canglezoominv),
<a name="l01171"></a>01171 flipx, flipy,
<a name="l01172"></a>01172 smooth);
<a name="l01173"></a>01173 <span class="comment">/*</span>
<a name="l01174"></a>01174 <span class="comment"> * Turn on source-alpha support </span>
<a name="l01175"></a>01175 <span class="comment"> */</span>
<a name="l01176"></a>01176 SDL_SetAlpha(rz_dst, SDL_SRCALPHA, 255);
<a name="l01177"></a>01177 SDL_SetColorKey(rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL, <a class="code" href="_s_d_l__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce" title="Returns colorkey info for a surface.">_colorkey</a>(rz_src));
<a name="l01178"></a>01178 } <span class="keywordflow">else</span> {
<a name="l01179"></a>01179 <span class="comment">/*</span>
<a name="l01180"></a>01180 <span class="comment"> * Copy palette and colorkey info </span>
<a name="l01181"></a>01181 <span class="comment"> */</span>
<a name="l01182"></a>01182 <span class="keywordflow">for</span> (i = 0; i < rz_src->format->palette->ncolors; i++) {
<a name="l01183"></a>01183 rz_dst->format->palette->colors[i] = rz_src->format->palette->colors[i];
<a name="l01184"></a>01184 }
<a name="l01185"></a>01185 rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
<a name="l01186"></a>01186 <span class="comment">/*</span>
<a name="l01187"></a>01187 <span class="comment"> * Call the 8bit transformation routine to do the rotation </span>
<a name="l01188"></a>01188 <span class="comment"> */</span>
<a name="l01189"></a>01189 <a class="code" href="_s_d_l__rotozoom_8c.html#a126e3b96b22cc18e78e33cc1f8eb6c3c" title="Rotates and zooms 8 bit palette/Y &#39;src&#39; surface to &#39;dst&#39; surface...">transformSurfaceY</a>(rz_src, rz_dst, dstwidthhalf, dstheighthalf,
<a name="l01190"></a>01190 (<span class="keywordtype">int</span>) (sanglezoominv), (<span class="keywordtype">int</span>) (canglezoominv),
<a name="l01191"></a>01191 flipx, flipy);
<a name="l01192"></a>01192 SDL_SetColorKey(rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL, <a class="code" href="_s_d_l__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce" title="Returns colorkey info for a surface.">_colorkey</a>(rz_src));
<a name="l01193"></a>01193 }
<a name="l01194"></a>01194 <span class="comment">/*</span>
<a name="l01195"></a>01195 <span class="comment"> * Unlock source surface </span>
<a name="l01196"></a>01196 <span class="comment"> */</span>
<a name="l01197"></a>01197 <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01198"></a>01198 SDL_UnlockSurface(rz_src);
<a name="l01199"></a>01199 }
<a name="l01200"></a>01200
<a name="l01201"></a>01201 } <span class="keywordflow">else</span> {
<a name="l01202"></a>01202
<a name="l01203"></a>01203 <span class="comment">/*</span>
<a name="l01204"></a>01204 <span class="comment"> * Angle=0: Just a zoom </span>
<a name="l01205"></a>01205 <span class="comment"> */</span>
<a name="l01206"></a>01206 <span class="comment">/*</span>
<a name="l01207"></a>01207 <span class="comment"> * -------------------- </span>
<a name="l01208"></a>01208 <span class="comment"> */</span>
<a name="l01209"></a>01209
<a name="l01210"></a>01210 <span class="comment">/*</span>
<a name="l01211"></a>01211 <span class="comment"> * Calculate target size</span>
<a name="l01212"></a>01212 <span class="comment"> */</span>
<a name="l01213"></a>01213 <a class="code" href="_s_d_l__rotozoom_8c.html#a8ba40859c1a977dae87488dd8be1bf9a" title="Calculates the size of the target surface for a zoomSurface() call.">zoomSurfaceSize</a>(rz_src->w, rz_src->h, zoomx, zoomy, &dstwidth, &dstheight);
<a name="l01214"></a>01214
<a name="l01215"></a>01215 <span class="comment">/*</span>
<a name="l01216"></a>01216 <span class="comment"> * Alloc space to completely contain the zoomed surface </span>
<a name="l01217"></a>01217 <span class="comment"> */</span>
<a name="l01218"></a>01218 rz_dst = NULL;
<a name="l01219"></a>01219 <span class="keywordflow">if</span> (is32bit) {
<a name="l01220"></a>01220 <span class="comment">/*</span>
<a name="l01221"></a>01221 <span class="comment"> * Target surface is 32bit with source RGBA/ABGR ordering </span>
<a name="l01222"></a>01222 <span class="comment"> */</span>
<a name="l01223"></a>01223 rz_dst =
<a name="l01224"></a>01224 SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 32,
<a name="l01225"></a>01225 rz_src->format->Rmask, rz_src->format->Gmask,
<a name="l01226"></a>01226 rz_src->format->Bmask, rz_src->format->Amask);
<a name="l01227"></a>01227 } <span class="keywordflow">else</span> {
<a name="l01228"></a>01228 <span class="comment">/*</span>
<a name="l01229"></a>01229 <span class="comment"> * Target surface is 8bit </span>
<a name="l01230"></a>01230 <span class="comment"> */</span>
<a name="l01231"></a>01231 rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 8, 0, 0, 0, 0);
<a name="l01232"></a>01232 }
<a name="l01233"></a>01233
<a name="l01234"></a>01234 <span class="comment">/* Check target */</span>
<a name="l01235"></a>01235 <span class="keywordflow">if</span> (rz_dst == NULL)
<a name="l01236"></a>01236 <span class="keywordflow">return</span> NULL;
<a name="l01237"></a>01237
<a name="l01238"></a>01238 <span class="comment">/* Adjust for guard rows */</span>
<a name="l01239"></a>01239 rz_dst->h = dstheight;
<a name="l01240"></a>01240
<a name="l01241"></a>01241 <span class="keywordflow">if</span> (colorKeyAvailable == 1){
<a name="l01242"></a>01242 colorkey = SDL_MapRGB(rz_dst->format, r, g, b);
<a name="l01243"></a>01243
<a name="l01244"></a>01244 SDL_FillRect(rz_dst, NULL, colorkey );
<a name="l01245"></a>01245 }
<a name="l01246"></a>01246
<a name="l01247"></a>01247 <span class="comment">/*</span>
<a name="l01248"></a>01248 <span class="comment"> * Lock source surface </span>
<a name="l01249"></a>01249 <span class="comment"> */</span>
<a name="l01250"></a>01250 <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01251"></a>01251 SDL_LockSurface(rz_src);
<a name="l01252"></a>01252 }
<a name="l01253"></a>01253
<a name="l01254"></a>01254 <span class="comment">/*</span>
<a name="l01255"></a>01255 <span class="comment"> * Check which kind of surface we have </span>
<a name="l01256"></a>01256 <span class="comment"> */</span>
<a name="l01257"></a>01257 <span class="keywordflow">if</span> (is32bit) {
<a name="l01258"></a>01258 <span class="comment">/*</span>
<a name="l01259"></a>01259 <span class="comment"> * Call the 32bit transformation routine to do the zooming (using alpha) </span>
<a name="l01260"></a>01260 <span class="comment"> */</span>
<a name="l01261"></a>01261 <a class="code" href="_s_d_l__rotozoom_8c.html#a9898b12bb565c4075c2da4db4891fd81" title="Internal 32 bit Zoomer with optional anti-aliasing by bilinear interpolation.">_zoomSurfaceRGBA</a>(rz_src, rz_dst, flipx, flipy, smooth);
<a name="l01262"></a>01262
<a name="l01263"></a>01263 <span class="comment">/*</span>
<a name="l01264"></a>01264 <span class="comment"> * Turn on source-alpha support </span>
<a name="l01265"></a>01265 <span class="comment"> */</span>
<a name="l01266"></a>01266 SDL_SetAlpha(rz_dst, SDL_SRCALPHA, 255);
<a name="l01267"></a>01267 SDL_SetColorKey(rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL, <a class="code" href="_s_d_l__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce" title="Returns colorkey info for a surface.">_colorkey</a>(rz_src));
<a name="l01268"></a>01268 } <span class="keywordflow">else</span> {
<a name="l01269"></a>01269 <span class="comment">/*</span>
<a name="l01270"></a>01270 <span class="comment"> * Copy palette and colorkey info </span>
<a name="l01271"></a>01271 <span class="comment"> */</span>
<a name="l01272"></a>01272 <span class="keywordflow">for</span> (i = 0; i < rz_src->format->palette->ncolors; i++) {
<a name="l01273"></a>01273 rz_dst->format->palette->colors[i] = rz_src->format->palette->colors[i];
<a name="l01274"></a>01274 }
<a name="l01275"></a>01275 rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
<a name="l01276"></a>01276
<a name="l01277"></a>01277 <span class="comment">/*</span>
<a name="l01278"></a>01278 <span class="comment"> * Call the 8bit transformation routine to do the zooming </span>
<a name="l01279"></a>01279 <span class="comment"> */</span>
<a name="l01280"></a>01280 <a class="code" href="_s_d_l__rotozoom_8c.html#acfeb5a322cbb575f105f1762d9d21c29" title="Internal 8 bit Zoomer without smoothing.">_zoomSurfaceY</a>(rz_src, rz_dst, flipx, flipy);
<a name="l01281"></a>01281 SDL_SetColorKey(rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL, <a class="code" href="_s_d_l__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce" title="Returns colorkey info for a surface.">_colorkey</a>(rz_src));
<a name="l01282"></a>01282 }
<a name="l01283"></a>01283
<a name="l01284"></a>01284 <span class="comment">/*</span>
<a name="l01285"></a>01285 <span class="comment"> * Unlock source surface </span>
<a name="l01286"></a>01286 <span class="comment"> */</span>
<a name="l01287"></a>01287 <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01288"></a>01288 SDL_UnlockSurface(rz_src);
<a name="l01289"></a>01289 }
<a name="l01290"></a>01290 }
<a name="l01291"></a>01291
<a name="l01292"></a>01292 <span class="comment">/*</span>
<a name="l01293"></a>01293 <span class="comment"> * Cleanup temp surface </span>
<a name="l01294"></a>01294 <span class="comment"> */</span>
<a name="l01295"></a>01295 <span class="keywordflow">if</span> (src_converted) {
<a name="l01296"></a>01296 SDL_FreeSurface(rz_src);
<a name="l01297"></a>01297 }
<a name="l01298"></a>01298
<a name="l01299"></a>01299 <span class="comment">/*</span>
<a name="l01300"></a>01300 <span class="comment"> * Return destination surface </span>
<a name="l01301"></a>01301 <span class="comment"> */</span>
<a name="l01302"></a>01302 <span class="keywordflow">return</span> (rz_dst);
<a name="l01303"></a>01303 }
<a name="l01304"></a>01304
<a name="l01317"></a><a class="code" href="_s_d_l__rotozoom_8h.html#a7927e415d87ea7856794cd4cc77e0a25">01317</a> <span class="keywordtype">void</span> <a class="code" href="_s_d_l__rotozoom_8c.html#a8ba40859c1a977dae87488dd8be1bf9a" title="Calculates the size of the target surface for a zoomSurface() call.">zoomSurfaceSize</a>(<span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">double</span> zoomx, <span class="keywordtype">double</span> zoomy, <span class="keywordtype">int</span> *dstwidth, <span class="keywordtype">int</span> *dstheight)
<a name="l01318"></a>01318 {
<a name="l01319"></a>01319 <span class="comment">/*</span>
<a name="l01320"></a>01320 <span class="comment"> * Make zoom factors positive </span>
<a name="l01321"></a>01321 <span class="comment"> */</span>
<a name="l01322"></a>01322 <span class="keywordtype">int</span> flipx, flipy;
<a name="l01323"></a>01323 flipx = (zoomx<0.0);
<a name="l01324"></a>01324 <span class="keywordflow">if</span> (flipx) zoomx = -zoomx;
<a name="l01325"></a>01325 flipy = (zoomy<0.0);
<a name="l01326"></a>01326 <span class="keywordflow">if</span> (flipy) zoomy = -zoomy;
<a name="l01327"></a>01327
<a name="l01328"></a>01328 <span class="comment">/*</span>
<a name="l01329"></a>01329 <span class="comment"> * Sanity check zoom factors </span>
<a name="l01330"></a>01330 <span class="comment"> */</span>
<a name="l01331"></a>01331 <span class="keywordflow">if</span> (zoomx < <a class="code" href="_s_d_l__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>) {
<a name="l01332"></a>01332 zoomx = <a class="code" href="_s_d_l__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>;
<a name="l01333"></a>01333 }
<a name="l01334"></a>01334 <span class="keywordflow">if</span> (zoomy < <a class="code" href="_s_d_l__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>) {
<a name="l01335"></a>01335 zoomy = <a class="code" href="_s_d_l__rotozoom_8c.html#a98a929bd64d660c1860c7b60b4fe5bd9" title="Lower limit of absolute zoom factor or rotation degrees.">VALUE_LIMIT</a>;
<a name="l01336"></a>01336 }
<a name="l01337"></a>01337
<a name="l01338"></a>01338 <span class="comment">/*</span>
<a name="l01339"></a>01339 <span class="comment"> * Calculate target size </span>
<a name="l01340"></a>01340 <span class="comment"> */</span>
<a name="l01341"></a>01341 *dstwidth = (int) ((<span class="keywordtype">double</span>) width * zoomx);
<a name="l01342"></a>01342 *dstheight = (int) ((<span class="keywordtype">double</span>) height * zoomy);
<a name="l01343"></a>01343 <span class="keywordflow">if</span> (*dstwidth < 1) {
<a name="l01344"></a>01344 *dstwidth = 1;
<a name="l01345"></a>01345 }
<a name="l01346"></a>01346 <span class="keywordflow">if</span> (*dstheight < 1) {
<a name="l01347"></a>01347 *dstheight = 1;
<a name="l01348"></a>01348 }
<a name="l01349"></a>01349 }
<a name="l01350"></a>01350
<a name="l01367"></a><a class="code" href="_s_d_l__rotozoom_8h.html#a06c8108f8fe8de77cf841c176ee64850">01367</a> SDL_Surface *<a class="code" href="_s_d_l__rotozoom_8c.html#abdd772b2f6b1f26134e4e90cda657a21" title="Zoom a surface by independent horizontal and vertical factors with optional smoothing...">zoomSurface</a>(SDL_Surface * src, <span class="keywordtype">double</span> zoomx, <span class="keywordtype">double</span> zoomy, <span class="keywordtype">int</span> smooth)
<a name="l01368"></a>01368 {
<a name="l01369"></a>01369 SDL_Surface *rz_src;
<a name="l01370"></a>01370 SDL_Surface *rz_dst;
<a name="l01371"></a>01371 <span class="keywordtype">int</span> dstwidth, dstheight;
<a name="l01372"></a>01372 <span class="keywordtype">int</span> is32bit;
<a name="l01373"></a>01373 <span class="keywordtype">int</span> i, src_converted;
<a name="l01374"></a>01374 <span class="keywordtype">int</span> flipx, flipy;
<a name="l01375"></a>01375
<a name="l01376"></a>01376 <span class="comment">/*</span>
<a name="l01377"></a>01377 <span class="comment"> * Sanity check </span>
<a name="l01378"></a>01378 <span class="comment"> */</span>
<a name="l01379"></a>01379 <span class="keywordflow">if</span> (src == NULL)
<a name="l01380"></a>01380 <span class="keywordflow">return</span> (NULL);
<a name="l01381"></a>01381
<a name="l01382"></a>01382 <span class="comment">/*</span>
<a name="l01383"></a>01383 <span class="comment"> * Determine if source surface is 32bit or 8bit </span>
<a name="l01384"></a>01384 <span class="comment"> */</span>
<a name="l01385"></a>01385 is32bit = (src->format->BitsPerPixel == 32);
<a name="l01386"></a>01386 <span class="keywordflow">if</span> ((is32bit) || (src->format->BitsPerPixel == 8)) {
<a name="l01387"></a>01387 <span class="comment">/*</span>
<a name="l01388"></a>01388 <span class="comment"> * Use source surface 'as is' </span>
<a name="l01389"></a>01389 <span class="comment"> */</span>
<a name="l01390"></a>01390 rz_src = src;
<a name="l01391"></a>01391 src_converted = 0;
<a name="l01392"></a>01392 } <span class="keywordflow">else</span> {
<a name="l01393"></a>01393 <span class="comment">/*</span>
<a name="l01394"></a>01394 <span class="comment"> * New source surface is 32bit with a defined RGBA ordering </span>
<a name="l01395"></a>01395 <span class="comment"> */</span>
<a name="l01396"></a>01396 rz_src =
<a name="l01397"></a>01397 SDL_CreateRGBSurface(SDL_SWSURFACE, src->w, src->h, 32,
<a name="l01398"></a>01398 #<span class="keywordflow">if</span> SDL_BYTEORDER == SDL_LIL_ENDIAN
<a name="l01399"></a>01399 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
<a name="l01400"></a>01400 #<span class="keywordflow">else</span>
<a name="l01401"></a>01401 0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff
<a name="l01402"></a>01402 #endif
<a name="l01403"></a>01403 );
<a name="l01404"></a>01404 SDL_BlitSurface(src, NULL, rz_src, NULL);
<a name="l01405"></a>01405 src_converted = 1;
<a name="l01406"></a>01406 is32bit = 1;
<a name="l01407"></a>01407 }
<a name="l01408"></a>01408
<a name="l01409"></a>01409 flipx = (zoomx<0.0);
<a name="l01410"></a>01410 <span class="keywordflow">if</span> (flipx) zoomx = -zoomx;
<a name="l01411"></a>01411 flipy = (zoomy<0.0);
<a name="l01412"></a>01412 <span class="keywordflow">if</span> (flipy) zoomy = -zoomy;
<a name="l01413"></a>01413
<a name="l01414"></a>01414 <span class="comment">/* Get size if target */</span>
<a name="l01415"></a>01415 <a class="code" href="_s_d_l__rotozoom_8c.html#a8ba40859c1a977dae87488dd8be1bf9a" title="Calculates the size of the target surface for a zoomSurface() call.">zoomSurfaceSize</a>(rz_src->w, rz_src->h, zoomx, zoomy, &dstwidth, &dstheight);
<a name="l01416"></a>01416
<a name="l01417"></a>01417 <span class="comment">/*</span>
<a name="l01418"></a>01418 <span class="comment"> * Alloc space to completely contain the zoomed surface </span>
<a name="l01419"></a>01419 <span class="comment"> */</span>
<a name="l01420"></a>01420 rz_dst = NULL;
<a name="l01421"></a>01421 <span class="keywordflow">if</span> (is32bit) {
<a name="l01422"></a>01422 <span class="comment">/*</span>
<a name="l01423"></a>01423 <span class="comment"> * Target surface is 32bit with source RGBA/ABGR ordering </span>
<a name="l01424"></a>01424 <span class="comment"> */</span>
<a name="l01425"></a>01425 rz_dst =
<a name="l01426"></a>01426 SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 32,
<a name="l01427"></a>01427 rz_src->format->Rmask, rz_src->format->Gmask,
<a name="l01428"></a>01428 rz_src->format->Bmask, rz_src->format->Amask);
<a name="l01429"></a>01429 } <span class="keywordflow">else</span> {
<a name="l01430"></a>01430 <span class="comment">/*</span>
<a name="l01431"></a>01431 <span class="comment"> * Target surface is 8bit </span>
<a name="l01432"></a>01432 <span class="comment"> */</span>
<a name="l01433"></a>01433 rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 8, 0, 0, 0, 0);
<a name="l01434"></a>01434 }
<a name="l01435"></a>01435
<a name="l01436"></a>01436 <span class="comment">/* Check target */</span>
<a name="l01437"></a>01437 <span class="keywordflow">if</span> (rz_dst == NULL)
<a name="l01438"></a>01438 <span class="keywordflow">return</span> NULL;
<a name="l01439"></a>01439
<a name="l01440"></a>01440 <span class="comment">/* Adjust for guard rows */</span>
<a name="l01441"></a>01441 rz_dst->h = dstheight;
<a name="l01442"></a>01442
<a name="l01443"></a>01443 <span class="comment">/*</span>
<a name="l01444"></a>01444 <span class="comment"> * Lock source surface </span>
<a name="l01445"></a>01445 <span class="comment"> */</span>
<a name="l01446"></a>01446 <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01447"></a>01447 SDL_LockSurface(rz_src);
<a name="l01448"></a>01448 }
<a name="l01449"></a>01449
<a name="l01450"></a>01450 <span class="comment">/*</span>
<a name="l01451"></a>01451 <span class="comment"> * Check which kind of surface we have </span>
<a name="l01452"></a>01452 <span class="comment"> */</span>
<a name="l01453"></a>01453 <span class="keywordflow">if</span> (is32bit) {
<a name="l01454"></a>01454 <span class="comment">/*</span>
<a name="l01455"></a>01455 <span class="comment"> * Call the 32bit transformation routine to do the zooming (using alpha) </span>
<a name="l01456"></a>01456 <span class="comment"> */</span>
<a name="l01457"></a>01457 <a class="code" href="_s_d_l__rotozoom_8c.html#a9898b12bb565c4075c2da4db4891fd81" title="Internal 32 bit Zoomer with optional anti-aliasing by bilinear interpolation.">_zoomSurfaceRGBA</a>(rz_src, rz_dst, flipx, flipy, smooth);
<a name="l01458"></a>01458 <span class="comment">/*</span>
<a name="l01459"></a>01459 <span class="comment"> * Turn on source-alpha support </span>
<a name="l01460"></a>01460 <span class="comment"> */</span>
<a name="l01461"></a>01461 SDL_SetAlpha(rz_dst, SDL_SRCALPHA, 255);
<a name="l01462"></a>01462 } <span class="keywordflow">else</span> {
<a name="l01463"></a>01463 <span class="comment">/*</span>
<a name="l01464"></a>01464 <span class="comment"> * Copy palette and colorkey info </span>
<a name="l01465"></a>01465 <span class="comment"> */</span>
<a name="l01466"></a>01466 <span class="keywordflow">for</span> (i = 0; i < rz_src->format->palette->ncolors; i++) {
<a name="l01467"></a>01467 rz_dst->format->palette->colors[i] = rz_src->format->palette->colors[i];
<a name="l01468"></a>01468 }
<a name="l01469"></a>01469 rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
<a name="l01470"></a>01470 <span class="comment">/*</span>
<a name="l01471"></a>01471 <span class="comment"> * Call the 8bit transformation routine to do the zooming </span>
<a name="l01472"></a>01472 <span class="comment"> */</span>
<a name="l01473"></a>01473 <a class="code" href="_s_d_l__rotozoom_8c.html#acfeb5a322cbb575f105f1762d9d21c29" title="Internal 8 bit Zoomer without smoothing.">_zoomSurfaceY</a>(rz_src, rz_dst, flipx, flipy);
<a name="l01474"></a>01474 SDL_SetColorKey(rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL, <a class="code" href="_s_d_l__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce" title="Returns colorkey info for a surface.">_colorkey</a>(rz_src));
<a name="l01475"></a>01475 }
<a name="l01476"></a>01476 <span class="comment">/*</span>
<a name="l01477"></a>01477 <span class="comment"> * Unlock source surface </span>
<a name="l01478"></a>01478 <span class="comment"> */</span>
<a name="l01479"></a>01479 <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01480"></a>01480 SDL_UnlockSurface(rz_src);
<a name="l01481"></a>01481 }
<a name="l01482"></a>01482
<a name="l01483"></a>01483 <span class="comment">/*</span>
<a name="l01484"></a>01484 <span class="comment"> * Cleanup temp surface </span>
<a name="l01485"></a>01485 <span class="comment"> */</span>
<a name="l01486"></a>01486 <span class="keywordflow">if</span> (src_converted) {
<a name="l01487"></a>01487 SDL_FreeSurface(rz_src);
<a name="l01488"></a>01488 }
<a name="l01489"></a>01489
<a name="l01490"></a>01490 <span class="comment">/*</span>
<a name="l01491"></a>01491 <span class="comment"> * Return destination surface </span>
<a name="l01492"></a>01492 <span class="comment"> */</span>
<a name="l01493"></a>01493 <span class="keywordflow">return</span> (rz_dst);
<a name="l01494"></a>01494 }
<a name="l01495"></a>01495
<a name="l01512"></a><a class="code" href="_s_d_l__rotozoom_8h.html#a7a7ac2cc0d79d282b5a4c76143b7e7a9">01512</a> SDL_Surface *<a class="code" href="_s_d_l__rotozoom_8c.html#aad3bf0cd89cc39ff874ffa778fa1495d" title="Shrink a surface by an integer ratio using averaging.">shrinkSurface</a>(SDL_Surface *src, <span class="keywordtype">int</span> factorx, <span class="keywordtype">int</span> factory)
<a name="l01513"></a>01513 {
<a name="l01514"></a>01514 SDL_Surface *rz_src;
<a name="l01515"></a>01515 SDL_Surface *rz_dst;
<a name="l01516"></a>01516 <span class="keywordtype">int</span> dstwidth, dstheight;
<a name="l01517"></a>01517 <span class="keywordtype">int</span> is32bit;
<a name="l01518"></a>01518 <span class="keywordtype">int</span> i, src_converted;
<a name="l01519"></a>01519
<a name="l01520"></a>01520 <span class="comment">/*</span>
<a name="l01521"></a>01521 <span class="comment"> * Sanity check </span>
<a name="l01522"></a>01522 <span class="comment"> */</span>
<a name="l01523"></a>01523 <span class="keywordflow">if</span> (src == NULL)
<a name="l01524"></a>01524 <span class="keywordflow">return</span> (NULL);
<a name="l01525"></a>01525
<a name="l01526"></a>01526 <span class="comment">/*</span>
<a name="l01527"></a>01527 <span class="comment"> * Determine if source surface is 32bit or 8bit </span>
<a name="l01528"></a>01528 <span class="comment"> */</span>
<a name="l01529"></a>01529 is32bit = (src->format->BitsPerPixel == 32);
<a name="l01530"></a>01530 <span class="keywordflow">if</span> ((is32bit) || (src->format->BitsPerPixel == 8)) {
<a name="l01531"></a>01531 <span class="comment">/*</span>
<a name="l01532"></a>01532 <span class="comment"> * Use source surface 'as is' </span>
<a name="l01533"></a>01533 <span class="comment"> */</span>
<a name="l01534"></a>01534 rz_src = src;
<a name="l01535"></a>01535 src_converted = 0;
<a name="l01536"></a>01536 } <span class="keywordflow">else</span> {
<a name="l01537"></a>01537 <span class="comment">/*</span>
<a name="l01538"></a>01538 <span class="comment"> * New source surface is 32bit with a defined RGBA ordering </span>
<a name="l01539"></a>01539 <span class="comment"> */</span>
<a name="l01540"></a>01540 rz_src =
<a name="l01541"></a>01541 SDL_CreateRGBSurface(SDL_SWSURFACE, src->w, src->h, 32,
<a name="l01542"></a>01542 #<span class="keywordflow">if</span> SDL_BYTEORDER == SDL_LIL_ENDIAN
<a name="l01543"></a>01543 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
<a name="l01544"></a>01544 #<span class="keywordflow">else</span>
<a name="l01545"></a>01545 0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff
<a name="l01546"></a>01546 #endif
<a name="l01547"></a>01547 );
<a name="l01548"></a>01548 SDL_BlitSurface(src, NULL, rz_src, NULL);
<a name="l01549"></a>01549 src_converted = 1;
<a name="l01550"></a>01550 is32bit = 1;
<a name="l01551"></a>01551 }
<a name="l01552"></a>01552
<a name="l01553"></a>01553 <span class="comment">/* Get size for target */</span>
<a name="l01554"></a>01554 dstwidth=rz_src->w/factorx;
<a name="l01555"></a>01555 <span class="keywordflow">while</span> (dstwidth*factorx>rz_src->w) { dstwidth--; }
<a name="l01556"></a>01556 dstheight=rz_src->h/factory;
<a name="l01557"></a>01557 <span class="keywordflow">while</span> (dstheight*factory>rz_src->h) { dstheight--; }
<a name="l01558"></a>01558
<a name="l01559"></a>01559 <span class="comment">/*</span>
<a name="l01560"></a>01560 <span class="comment"> * Alloc space to completely contain the shrunken surface</span>
<a name="l01561"></a>01561 <span class="comment"> * (with added guard rows)</span>
<a name="l01562"></a>01562 <span class="comment"> */</span>
<a name="l01563"></a>01563 rz_dst = NULL;
<a name="l01564"></a>01564 <span class="keywordflow">if</span> (is32bit) {
<a name="l01565"></a>01565 <span class="comment">/*</span>
<a name="l01566"></a>01566 <span class="comment"> * Target surface is 32bit with source RGBA/ABGR ordering </span>
<a name="l01567"></a>01567 <span class="comment"> */</span>
<a name="l01568"></a>01568 rz_dst =
<a name="l01569"></a>01569 SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 32,
<a name="l01570"></a>01570 rz_src->format->Rmask, rz_src->format->Gmask,
<a name="l01571"></a>01571 rz_src->format->Bmask, rz_src->format->Amask);
<a name="l01572"></a>01572 } <span class="keywordflow">else</span> {
<a name="l01573"></a>01573 <span class="comment">/*</span>
<a name="l01574"></a>01574 <span class="comment"> * Target surface is 8bit </span>
<a name="l01575"></a>01575 <span class="comment"> */</span>
<a name="l01576"></a>01576 rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + <a class="code" href="_s_d_l__rotozoom_8c.html#a05a2601b7ea2906858ccc31b45fdc6eb" title="Number of guard rows added to destination surfaces.">GUARD_ROWS</a>, 8, 0, 0, 0, 0);
<a name="l01577"></a>01577 }
<a name="l01578"></a>01578
<a name="l01579"></a>01579 <span class="comment">/* Check target */</span>
<a name="l01580"></a>01580 <span class="keywordflow">if</span> (rz_dst == NULL)
<a name="l01581"></a>01581 <span class="keywordflow">return</span> NULL;
<a name="l01582"></a>01582
<a name="l01583"></a>01583 <span class="comment">/* Adjust for guard rows */</span>
<a name="l01584"></a>01584 rz_dst->h = dstheight;
<a name="l01585"></a>01585
<a name="l01586"></a>01586 <span class="comment">/*</span>
<a name="l01587"></a>01587 <span class="comment"> * Lock source surface </span>
<a name="l01588"></a>01588 <span class="comment"> */</span>
<a name="l01589"></a>01589 <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01590"></a>01590 SDL_LockSurface(rz_src);
<a name="l01591"></a>01591 }
<a name="l01592"></a>01592
<a name="l01593"></a>01593 <span class="comment">/*</span>
<a name="l01594"></a>01594 <span class="comment"> * Check which kind of surface we have </span>
<a name="l01595"></a>01595 <span class="comment"> */</span>
<a name="l01596"></a>01596 <span class="keywordflow">if</span> (is32bit) {
<a name="l01597"></a>01597 <span class="comment">/*</span>
<a name="l01598"></a>01598 <span class="comment"> * Call the 32bit transformation routine to do the shrinking (using alpha) </span>
<a name="l01599"></a>01599 <span class="comment"> */</span>
<a name="l01600"></a>01600 <a class="code" href="_s_d_l__rotozoom_8c.html#ac1bde824f44ae9a76930e9782b783512" title="Internal 32 bit integer-factor averaging Shrinker.">_shrinkSurfaceRGBA</a>(rz_src, rz_dst, factorx, factory);
<a name="l01601"></a>01601 <span class="comment">/*</span>
<a name="l01602"></a>01602 <span class="comment"> * Turn on source-alpha support </span>
<a name="l01603"></a>01603 <span class="comment"> */</span>
<a name="l01604"></a>01604 SDL_SetAlpha(rz_dst, SDL_SRCALPHA, 255);
<a name="l01605"></a>01605 } <span class="keywordflow">else</span> {
<a name="l01606"></a>01606 <span class="comment">/*</span>
<a name="l01607"></a>01607 <span class="comment"> * Copy palette and colorkey info </span>
<a name="l01608"></a>01608 <span class="comment"> */</span>
<a name="l01609"></a>01609 <span class="keywordflow">for</span> (i = 0; i < rz_src->format->palette->ncolors; i++) {
<a name="l01610"></a>01610 rz_dst->format->palette->colors[i] = rz_src->format->palette->colors[i];
<a name="l01611"></a>01611 }
<a name="l01612"></a>01612 rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
<a name="l01613"></a>01613 <span class="comment">/*</span>
<a name="l01614"></a>01614 <span class="comment"> * Call the 8bit transformation routine to do the shrinking </span>
<a name="l01615"></a>01615 <span class="comment"> */</span>
<a name="l01616"></a>01616 <a class="code" href="_s_d_l__rotozoom_8c.html#aadb38a61ab6727e5fd621b63418399be" title="Internal 8 bit integer-factor averaging shrinker.">_shrinkSurfaceY</a>(rz_src, rz_dst, factorx, factory);
<a name="l01617"></a>01617 SDL_SetColorKey(rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL, <a class="code" href="_s_d_l__rotozoom_8c.html#afe2a2e4dc6cc462c5fc98a2110b8e1ce" title="Returns colorkey info for a surface.">_colorkey</a>(rz_src));
<a name="l01618"></a>01618 }
<a name="l01619"></a>01619
<a name="l01620"></a>01620 <span class="comment">/*</span>
<a name="l01621"></a>01621 <span class="comment"> * Unlock source surface </span>
<a name="l01622"></a>01622 <span class="comment"> */</span>
<a name="l01623"></a>01623 <span class="keywordflow">if</span> (SDL_MUSTLOCK(rz_src)) {
<a name="l01624"></a>01624 SDL_UnlockSurface(rz_src);
<a name="l01625"></a>01625 }
<a name="l01626"></a>01626
<a name="l01627"></a>01627 <span class="comment">/*</span>
<a name="l01628"></a>01628 <span class="comment"> * Cleanup temp surface </span>
<a name="l01629"></a>01629 <span class="comment"> */</span>
<a name="l01630"></a>01630 <span class="keywordflow">if</span> (src_converted) {
<a name="l01631"></a>01631 SDL_FreeSurface(rz_src);
<a name="l01632"></a>01632 }
<a name="l01633"></a>01633
<a name="l01634"></a>01634 <span class="comment">/*</span>
<a name="l01635"></a>01635 <span class="comment"> * Return destination surface </span>
<a name="l01636"></a>01636 <span class="comment"> */</span>
<a name="l01637"></a>01637 <span class="keywordflow">return</span> (rz_dst);
<a name="l01638"></a>01638 }
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