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<div id="projectname">Leptonica <span id="projectnumber">1.68</span></div>
<div id="projectbrief">C Image Processing Library</div>
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<h1>blend.c</h1> </div>
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<a href="blend_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"> - Copyright (C) 2001 Leptonica. All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment"> - This software is distributed in the hope that it will be</span>
<a name="l00004"></a>00004 <span class="comment"> - useful, but with NO WARRANTY OF ANY KIND.</span>
<a name="l00005"></a>00005 <span class="comment"> - No author or distributor accepts responsibility to anyone for the</span>
<a name="l00006"></a>00006 <span class="comment"> - consequences of using this software, or for whether it serves any</span>
<a name="l00007"></a>00007 <span class="comment"> - particular purpose or works at all, unless he or she says so in</span>
<a name="l00008"></a>00008 <span class="comment"> - writing. Everyone is granted permission to copy, modify and</span>
<a name="l00009"></a>00009 <span class="comment"> - redistribute this source code, for commercial or non-commercial</span>
<a name="l00010"></a>00010 <span class="comment"> - purposes, with the following restrictions: (1) the origin of this</span>
<a name="l00011"></a>00011 <span class="comment"> - source code must not be misrepresented; (2) modified versions must</span>
<a name="l00012"></a>00012 <span class="comment"> - be plainly marked as such; and (3) this notice may not be removed</span>
<a name="l00013"></a>00013 <span class="comment"> - or altered from any source or modified source distribution.</span>
<a name="l00014"></a>00014 <span class="comment"> *====================================================================*/</span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="comment">/*</span>
<a name="l00017"></a>00017 <span class="comment"> * blend.c</span>
<a name="l00018"></a>00018 <span class="comment"> *</span>
<a name="l00019"></a>00019 <span class="comment"> * Blending two images that are not colormapped</span>
<a name="l00020"></a>00020 <span class="comment"> * PIX *pixBlend()</span>
<a name="l00021"></a>00021 <span class="comment"> * PIX *pixBlendMask()</span>
<a name="l00022"></a>00022 <span class="comment"> * PIX *pixBlendGray()</span>
<a name="l00023"></a>00023 <span class="comment"> * PIX *pixBlendColor()</span>
<a name="l00024"></a>00024 <span class="comment"> * PIX *pixBlendColorByChannel()</span>
<a name="l00025"></a>00025 <span class="comment"> * PIX *pixBlendGrayAdapt()</span>
<a name="l00026"></a>00026 <span class="comment"> * static l_int32 blendComponents()</span>
<a name="l00027"></a>00027 <span class="comment"> * PIX *pixFadeWithGray()</span>
<a name="l00028"></a>00028 <span class="comment"> * PIX *pixBlendHardLight()</span>
<a name="l00029"></a>00029 <span class="comment"> * static l_int32 blendHardLightComponents()</span>
<a name="l00030"></a>00030 <span class="comment"> *</span>
<a name="l00031"></a>00031 <span class="comment"> * Blending two colormapped images</span>
<a name="l00032"></a>00032 <span class="comment"> * l_int32 pixBlendCmap()</span>
<a name="l00033"></a>00033 <span class="comment"> *</span>
<a name="l00034"></a>00034 <span class="comment"> * Blending two images using a third (alpha mask)</span>
<a name="l00035"></a>00035 <span class="comment"> * PIX *pixBlendWithGrayMask()</span>
<a name="l00036"></a>00036 <span class="comment"> *</span>
<a name="l00037"></a>00037 <span class="comment"> * Coloring "gray" pixels</span>
<a name="l00038"></a>00038 <span class="comment"> * l_int32 pixColorGray()</span>
<a name="l00039"></a>00039 <span class="comment"> *</span>
<a name="l00040"></a>00040 <span class="comment"> * Adjusting one or more colors to a target color</span>
<a name="l00041"></a>00041 <span class="comment"> * PIX *pixSnapColor()</span>
<a name="l00042"></a>00042 <span class="comment"> * PIX *pixSnapColorCmap()</span>
<a name="l00043"></a>00043 <span class="comment"> *</span>
<a name="l00044"></a>00044 <span class="comment"> * Mapping colors based on a source/target pair</span>
<a name="l00045"></a>00045 <span class="comment"> * PIX *pixLinearMapToTargetColor()</span>
<a name="l00046"></a>00046 <span class="comment"> * l_uint32 pixelLinearMapToTargetColor()</span>
<a name="l00047"></a>00047 <span class="comment"> *</span>
<a name="l00048"></a>00048 <span class="comment"> * Fractional shift of RGB towards black or white</span>
<a name="l00049"></a>00049 <span class="comment"> * l_uint32 pixelFractionalShift()</span>
<a name="l00050"></a>00050 <span class="comment"> *</span>
<a name="l00051"></a>00051 <span class="comment"> * In blending operations a new pix is produced where typically</span>
<a name="l00052"></a>00052 <span class="comment"> * a subset of pixels in src1 are changed by the set of pixels</span>
<a name="l00053"></a>00053 <span class="comment"> * in src2, when src2 is located in a given position relative</span>
<a name="l00054"></a>00054 <span class="comment"> * to src1. This is similar to rasterop, except that the</span>
<a name="l00055"></a>00055 <span class="comment"> * blending operations we allow are more complex, and typically</span>
<a name="l00056"></a>00056 <span class="comment"> * result in dest pixels that are a linear combination of two</span>
<a name="l00057"></a>00057 <span class="comment"> * pixels, such as src1 and its inverse. I find it convenient</span>
<a name="l00058"></a>00058 <span class="comment"> * to think of src2 as the "blender" (the one that takes the action)</span>
<a name="l00059"></a>00059 <span class="comment"> * and src1 as the "blendee" (the one that changes).</span>
<a name="l00060"></a>00060 <span class="comment"> *</span>
<a name="l00061"></a>00061 <span class="comment"> * Blending works best when src1 is 8 or 32 bpp. We also allow</span>
<a name="l00062"></a>00062 <span class="comment"> * src1 to be colormapped, but the colormap is removed before blending,</span>
<a name="l00063"></a>00063 <span class="comment"> * so if src1 is colormapped, we can't allow in-place blending.</span>
<a name="l00064"></a>00064 <span class="comment"> *</span>
<a name="l00065"></a>00065 <span class="comment"> * Because src2 is typically smaller than src1, we can implement by</span>
<a name="l00066"></a>00066 <span class="comment"> * clipping src2 to src1 and then transforming some of the dest</span>
<a name="l00067"></a>00067 <span class="comment"> * pixels that are under the support of src2. In practice, we</span>
<a name="l00068"></a>00068 <span class="comment"> * do the clipping in the inner pixel loop. For grayscale and</span>
<a name="l00069"></a>00069 <span class="comment"> * color src2, we also allow a simple form of transparency, where</span>
<a name="l00070"></a>00070 <span class="comment"> * pixels of a particular value in src2 are transparent; for those pixels,</span>
<a name="l00071"></a>00071 <span class="comment"> * no blending is done.</span>
<a name="l00072"></a>00072 <span class="comment"> *</span>
<a name="l00073"></a>00073 <span class="comment"> * The blending functions are categorized by the depth of src2,</span>
<a name="l00074"></a>00074 <span class="comment"> * the blender, and not that of src1, the blendee.</span>
<a name="l00075"></a>00075 <span class="comment"> *</span>
<a name="l00076"></a>00076 <span class="comment"> * - If src2 is 1 bpp, we can do one of three things:</span>
<a name="l00077"></a>00077 <span class="comment"> * (1) L_BLEND_WITH_INVERSE: Blend a given fraction of src1 with its</span>
<a name="l00078"></a>00078 <span class="comment"> * inverse color for those pixels in src2 that are fg (ON),</span>
<a name="l00079"></a>00079 <span class="comment"> * and leave the dest pixels unchanged for pixels in src2 that</span>
<a name="l00080"></a>00080 <span class="comment"> * are bg (OFF).</span>
<a name="l00081"></a>00081 <span class="comment"> * (2) L_BLEND_TO_WHITE: Fade the src1 pixels toward white by a</span>
<a name="l00082"></a>00082 <span class="comment"> * given fraction for those pixels in src2 that are fg (ON),</span>
<a name="l00083"></a>00083 <span class="comment"> * and leave the dest pixels unchanged for pixels in src2 that</span>
<a name="l00084"></a>00084 <span class="comment"> * are bg (OFF).</span>
<a name="l00085"></a>00085 <span class="comment"> * (3) L_BLEND_TO_BLACK: Fade the src1 pixels toward black by a</span>
<a name="l00086"></a>00086 <span class="comment"> * given fraction for those pixels in src2 that are fg (ON),</span>
<a name="l00087"></a>00087 <span class="comment"> * and leave the dest pixels unchanged for pixels in src2 that</span>
<a name="l00088"></a>00088 <span class="comment"> * are bg (OFF).</span>
<a name="l00089"></a>00089 <span class="comment"> * The blending function is pixBlendMask().</span>
<a name="l00090"></a>00090 <span class="comment"> *</span>
<a name="l00091"></a>00091 <span class="comment"> * - If src2 is 8 bpp grayscale, we can do one of two things</span>
<a name="l00092"></a>00092 <span class="comment"> * (but see pixFadeWithGray() below):</span>
<a name="l00093"></a>00093 <span class="comment"> * (1) L_BLEND_GRAY: If src1 is 8 bpp, mix the two values, using</span>
<a name="l00094"></a>00094 <span class="comment"> * a fraction of src2 and (1 - fraction) of src1.</span>
<a name="l00095"></a>00095 <span class="comment"> * If src1 is 32 bpp (rgb), mix the fraction of src2 with</span>
<a name="l00096"></a>00096 <span class="comment"> * each of the color components in src1.</span>
<a name="l00097"></a>00097 <span class="comment"> * (2) L_BLEND_GRAY_WITH_INVERSE: Use the grayscale value in src2</span>
<a name="l00098"></a>00098 <span class="comment"> * to determine how much of the inverse of a src1 pixel is</span>
<a name="l00099"></a>00099 <span class="comment"> * to be combined with the pixel value. The input fraction</span>
<a name="l00100"></a>00100 <span class="comment"> * further acts to scale the change in the src1 pixel.</span>
<a name="l00101"></a>00101 <span class="comment"> * The blending function is pixBlendGray().</span>
<a name="l00102"></a>00102 <span class="comment"> *</span>
<a name="l00103"></a>00103 <span class="comment"> * - If src2 is color, we blend a given fraction of src2 with</span>
<a name="l00104"></a>00104 <span class="comment"> * src1. If src1 is 8 bpp, the resulting image is 32 bpp.</span>
<a name="l00105"></a>00105 <span class="comment"> * The blending function is pixBlendColor().</span>
<a name="l00106"></a>00106 <span class="comment"> *</span>
<a name="l00107"></a>00107 <span class="comment"> * - For all three blending functions -- pixBlendMask(), pixBlendGray()</span>
<a name="l00108"></a>00108 <span class="comment"> * and pixBlendColor() -- you can apply the blender to the blendee</span>
<a name="l00109"></a>00109 <span class="comment"> * either in-place or generating a new pix. For the in-place</span>
<a name="l00110"></a>00110 <span class="comment"> * operation, this requires that the depth of the resulting pix</span>
<a name="l00111"></a>00111 <span class="comment"> * must equal that of the input pixs1.</span>
<a name="l00112"></a>00112 <span class="comment"> *</span>
<a name="l00113"></a>00113 <span class="comment"> * - We remove colormaps from src1 and src2 before blending.</span>
<a name="l00114"></a>00114 <span class="comment"> * Any quantization would have to be done after blending.</span>
<a name="l00115"></a>00115 <span class="comment"> *</span>
<a name="l00116"></a>00116 <span class="comment"> * We include another function, pixFadeWithGray(), that blends</span>
<a name="l00117"></a>00117 <span class="comment"> * a gray or color src1 with a gray src2. It does one of these things:</span>
<a name="l00118"></a>00118 <span class="comment"> * (1) L_BLEND_TO_WHITE: Fade the src1 pixels toward white by</span>
<a name="l00119"></a>00119 <span class="comment"> * a number times the value in src2.</span>
<a name="l00120"></a>00120 <span class="comment"> * (2) L_BLEND_TO_BLACK: Fade the src1 pixels toward black by</span>
<a name="l00121"></a>00121 <span class="comment"> * a number times the value in src2.</span>
<a name="l00122"></a>00122 <span class="comment"> *</span>
<a name="l00123"></a>00123 <span class="comment"> * Also included is a generalization of the so-called "hard light"</span>
<a name="l00124"></a>00124 <span class="comment"> * blending: pixBlendHardLight(). We generalize by allowing a fraction < 1.0</span>
<a name="l00125"></a>00125 <span class="comment"> * of the blender to be admixed with the blendee. The standard function</span>
<a name="l00126"></a>00126 <span class="comment"> * does full mixing.</span>
<a name="l00127"></a>00127 <span class="comment"> */</span>
<a name="l00128"></a>00128
<a name="l00129"></a>00129
<a name="l00130"></a>00130 <span class="preprocessor">#include <stdio.h></span>
<a name="l00131"></a>00131 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00132"></a>00132 <span class="preprocessor">#include "<a class="code" href="allheaders_8h.html" title="Includes all required Leptonica header files.">allheaders.h</a>"</span>
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="keyword">static</span> <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="blend_8c.html#ad12eec2ea8dff86628c6d5717214da66">blendComponents</a>(<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> a, <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> b, <a class="code" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract);
<a name="l00135"></a>00135 <span class="keyword">static</span> <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="blend_8c.html#aece01093947264a4b0363e6190875035">blendHardLightComponents</a>(<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> a, <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> b, <a class="code" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract);
<a name="l00136"></a>00136
<a name="l00137"></a>00137
<a name="l00138"></a>00138
<a name="l00139"></a>00139 <span class="comment">/*-------------------------------------------------------------*</span>
<a name="l00140"></a>00140 <span class="comment"> * Pixel blending *</span>
<a name="l00141"></a>00141 <span class="comment"> *-------------------------------------------------------------*/</span><span class="comment"></span>
<a name="l00142"></a>00142 <span class="comment">/*!</span>
<a name="l00143"></a>00143 <span class="comment"> * pixBlend()</span>
<a name="l00144"></a>00144 <span class="comment"> *</span>
<a name="l00145"></a>00145 <span class="comment"> * Input: pixs1 (blendee)</span>
<a name="l00146"></a>00146 <span class="comment"> * pixs2 (blender; typ. smaller)</span>
<a name="l00147"></a>00147 <span class="comment"> * x,y (origin (UL corner) of pixs2 relative to</span>
<a name="l00148"></a>00148 <span class="comment"> * the origin of pixs1; can be < 0)</span>
<a name="l00149"></a>00149 <span class="comment"> * fract (blending fraction)</span>
<a name="l00150"></a>00150 <span class="comment"> * Return: pixd (blended image), or null on error</span>
<a name="l00151"></a>00151 <span class="comment"> *</span>
<a name="l00152"></a>00152 <span class="comment"> * Notes:</span>
<a name="l00153"></a>00153 <span class="comment"> * (1) This is a simple top-level interface. For more flexibility,</span>
<a name="l00154"></a>00154 <span class="comment"> * call directly into pixBlendMask(), etc.</span>
<a name="l00155"></a>00155 <span class="comment"> */</span>
<a name="l00156"></a>00156 <a class="code" href="struct_pix.html">PIX</a> *
<a name="l00157"></a><a class="code" href="leptprotos_8h.html#aee74ab58c59919c60bdc45f82c807a2b">00157</a> <a class="code" href="blend_8c.html#aa54f843a3af2e59878454fe41d41a614">pixBlend</a>(<a class="code" href="struct_pix.html">PIX</a> *pixs1,
<a name="l00158"></a>00158 <a class="code" href="struct_pix.html">PIX</a> *pixs2,
<a name="l00159"></a>00159 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> x,
<a name="l00160"></a>00160 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> y,
<a name="l00161"></a>00161 <a class="code" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract)
<a name="l00162"></a>00162 {
<a name="l00163"></a>00163 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> w1, h1, d1, d2;
<a name="l00164"></a>00164 <a class="code" href="struct_box.html">BOX</a> *box;
<a name="l00165"></a>00165 <a class="code" href="struct_pix.html">PIX</a> *pixc, *pixt, *pixd;
<a name="l00166"></a>00166
<a name="l00167"></a>00167 <a class="code" href="environ_8h.html#a1a16952819bcbc526c998e3ac86f2e78">PROCNAME</a>(<span class="stringliteral">"pixBlend"</span>);
<a name="l00168"></a>00168
<a name="l00169"></a>00169 <span class="keywordflow">if</span> (!pixs1)
<a name="l00170"></a>00170 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs1 not defined"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00171"></a>00171 <span class="keywordflow">if</span> (!pixs2)
<a name="l00172"></a>00172 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs2 not defined"</span>, procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00173"></a>00173
<a name="l00174"></a>00174 <span class="comment">/* check relative depths */</span>
<a name="l00175"></a>00175 d1 = <a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs1);
<a name="l00176"></a>00176 d2 = <a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs2);
<a name="l00177"></a>00177 <span class="keywordflow">if</span> (d1 == 1 && d2 > 1)
<a name="l00178"></a>00178 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"mixing gray or color with 1 bpp"</span>,
<a name="l00179"></a>00179 procName, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00180"></a>00180
<a name="l00181"></a>00181 <span class="comment">/* remove colormap from pixs2 if necessary */</span>
<a name="l00182"></a>00182 pixt = <a class="code" href="leptprotos_8h.html#a422b2e45ac5ed1185c1804fdca9f7528">pixRemoveColormap</a>(pixs2, <a class="code" href="pix_8h.html#aabfcbcb5ac86a1edac4035264bc7d2b8a928326b36824c842a5b94c680eab098c">REMOVE_CMAP_BASED_ON_SRC</a>);
<a name="l00183"></a>00183 d2 = <a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixt);
<a name="l00184"></a>00184
<a name="l00185"></a>00185 <span class="comment">/* Check if pixs2 is clipped by its position with respect</span>
<a name="l00186"></a>00186 <span class="comment"> * to pixs1; if so, clip it and redefine x and y if necessary.</span>
<a name="l00187"></a>00187 <span class="comment"> * This actually isn't necessary, as the specific blending</span>
<a name="l00188"></a>00188 <span class="comment"> * functions do the clipping directly in the pixel loop</span>
<a name="l00189"></a>00189 <span class="comment"> * over pixs2, but it's included here to show how it can</span>
<a name="l00190"></a>00190 <span class="comment"> * easily be done on pixs2 first. */</span>
<a name="l00191"></a>00191 <a class="code" href="leptprotos_8h.html#a11b8bc890f3872b0a19307f4c5a9b41e">pixGetDimensions</a>(pixs1, &w1, &h1, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00192"></a>00192 box = <a class="code" href="boxbasic_8c.html#ad846c5f00e3aaed3dd4329347acac89d">boxCreate</a>(-x, -y, w1, h1); <span class="comment">/* box of pixs1 relative to pixs2 */</span>
<a name="l00193"></a>00193 pixc = <a class="code" href="leptprotos_8h.html#a679fd22fd63f9c368f4417c0a2a11b2a">pixClipRectangle</a>(pixt, box, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00194"></a>00194 <a class="code" href="boxbasic_8c.html#a494a2b1bf2e00d030dae5e11e12dbddb">boxDestroy</a>(&box);
<a name="l00195"></a>00195 <span class="keywordflow">if</span> (!pixc) {
<a name="l00196"></a>00196 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"box doesn't overlap pix"</span>, procName);
<a name="l00197"></a>00197 <span class="keywordflow">return</span> <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00198"></a>00198 }
<a name="l00199"></a>00199 x = <a class="code" href="environ_8h.html#a806d5df14d476263788e0a67d3615b4d">L_MAX</a>(0, x);
<a name="l00200"></a>00200 y = <a class="code" href="environ_8h.html#a806d5df14d476263788e0a67d3615b4d">L_MAX</a>(0, y);
<a name="l00201"></a>00201
<a name="l00202"></a>00202 <span class="keywordflow">if</span> (d2 == 1)
<a name="l00203"></a>00203 pixd = <a class="code" href="blend_8c.html#aa3711c698d4fb80d7129018b5162f9c6">pixBlendMask</a>(<a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, pixs1, pixc, x, y, fract,
<a name="l00204"></a>00204 <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291da8fd0f1d495f371c29d8175c6aac407da">L_BLEND_WITH_INVERSE</a>);
<a name="l00205"></a>00205 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (d2 == 8)
<a name="l00206"></a>00206 pixd = <a class="code" href="blend_8c.html#a4d49fe68f0b6f6c4b487a82a0a78fdd5">pixBlendGray</a>(<a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, pixs1, pixc, x, y, fract,
<a name="l00207"></a>00207 <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291da5f7056c3021d9af1f9cc65d9d1dbf7a2">L_BLEND_GRAY</a>, 0, 0);
<a name="l00208"></a>00208 <span class="keywordflow">else</span> <span class="comment">/* d2 == 32 */</span>
<a name="l00209"></a>00209 pixd = <a class="code" href="blend_8c.html#a35ed557a91a1ad527ef4a6c00e91e6a1">pixBlendColor</a>(<a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, pixs1, pixc, x, y, fract, 0, 0);
<a name="l00210"></a>00210
<a name="l00211"></a>00211 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixc);
<a name="l00212"></a>00212 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixt);
<a name="l00213"></a>00213 <span class="keywordflow">return</span> pixd;
<a name="l00214"></a>00214 }
<a name="l00215"></a>00215
<a name="l00216"></a>00216 <span class="comment"></span>
<a name="l00217"></a>00217 <span class="comment">/*!</span>
<a name="l00218"></a>00218 <span class="comment"> * pixBlendMask()</span>
<a name="l00219"></a>00219 <span class="comment"> *</span>
<a name="l00220"></a>00220 <span class="comment"> * Input: pixd (<optional>; either NULL or equal to pixs1 for in-place)</span>
<a name="l00221"></a>00221 <span class="comment"> * pixs1 (blendee; depth > 1)</span>
<a name="l00222"></a>00222 <span class="comment"> * pixs2 (blender; typ. smaller in size than pixs1)</span>
<a name="l00223"></a>00223 <span class="comment"> * x,y (origin (UL corner) of pixs2 relative to</span>
<a name="l00224"></a>00224 <span class="comment"> * the origin of pixs1; can be < 0)</span>
<a name="l00225"></a>00225 <span class="comment"> * fract (blending fraction)</span>
<a name="l00226"></a>00226 <span class="comment"> * type (L_BLEND_WITH_INVERSE, L_BLEND_TO_WHITE, L_BLEND_TO_BLACK)</span>
<a name="l00227"></a>00227 <span class="comment"> * Return: pixd if OK; pixs1 on error</span>
<a name="l00228"></a>00228 <span class="comment"> *</span>
<a name="l00229"></a>00229 <span class="comment"> * Notes:</span>
<a name="l00230"></a>00230 <span class="comment"> * (1) pixs2 must be 1 bpp</span>
<a name="l00231"></a>00231 <span class="comment"> * (2) Clipping of pixs2 to pixs1 is done in the inner pixel loop.</span>
<a name="l00232"></a>00232 <span class="comment"> * (3) If pixs1 has a colormap, it is removed.</span>
<a name="l00233"></a>00233 <span class="comment"> * (4) For inplace operation, call it this way:</span>
<a name="l00234"></a>00234 <span class="comment"> * pixBlendMask(pixs1, pixs1, pixs2, ...)</span>
<a name="l00235"></a>00235 <span class="comment"> * (5) For generating a new pixd:</span>
<a name="l00236"></a>00236 <span class="comment"> * pixd = pixBlendMask(NULL, pixs1, pixs2, ...)</span>
<a name="l00237"></a>00237 <span class="comment"> * (6) Only call in-place if pixs1 does not have a colormap.</span>
<a name="l00238"></a>00238 <span class="comment"> */</span>
<a name="l00239"></a>00239 <a class="code" href="struct_pix.html">PIX</a> *
<a name="l00240"></a><a class="code" href="leptprotos_8h.html#a2a65f65647346ab90330ee04c6d86a5b">00240</a> <a class="code" href="blend_8c.html#aa3711c698d4fb80d7129018b5162f9c6">pixBlendMask</a>(<a class="code" href="struct_pix.html">PIX</a> *pixd,
<a name="l00241"></a>00241 <a class="code" href="struct_pix.html">PIX</a> *pixs1,
<a name="l00242"></a>00242 <a class="code" href="struct_pix.html">PIX</a> *pixs2,
<a name="l00243"></a>00243 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> x,
<a name="l00244"></a>00244 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> y,
<a name="l00245"></a>00245 <a class="code" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract,
<a name="l00246"></a>00246 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> type)
<a name="l00247"></a>00247 {
<a name="l00248"></a>00248 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> i, j, d, wc, hc, w, h, wplc;
<a name="l00249"></a>00249 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> val, rval, gval, bval;
<a name="l00250"></a>00250 <a class="code" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> pixval;
<a name="l00251"></a>00251 <a class="code" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> *linec, *datac;
<a name="l00252"></a>00252 <a class="code" href="struct_pix.html">PIX</a> *pixc, *pixt1, *pixt2;
<a name="l00253"></a>00253
<a name="l00254"></a>00254 <a class="code" href="environ_8h.html#a1a16952819bcbc526c998e3ac86f2e78">PROCNAME</a>(<span class="stringliteral">"pixBlendMask"</span>);
<a name="l00255"></a>00255
<a name="l00256"></a>00256 <span class="keywordflow">if</span> (!pixs1)
<a name="l00257"></a>00257 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs1 not defined"</span>, procName, pixd);
<a name="l00258"></a>00258 <span class="keywordflow">if</span> (!pixs2)
<a name="l00259"></a>00259 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs2 not defined"</span>, procName, pixd);
<a name="l00260"></a>00260 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs1) == 1)
<a name="l00261"></a>00261 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs1 is 1 bpp"</span>, procName, pixd);
<a name="l00262"></a>00262 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs2) != 1)
<a name="l00263"></a>00263 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs2 not 1 bpp"</span>, procName, pixd);
<a name="l00264"></a>00264 <span class="keywordflow">if</span> (pixd == pixs1 && <a class="code" href="leptprotos_8h.html#a6c959f1c381ebe5a4abc867a3d8ae1e6">pixGetColormap</a>(pixs1))
<a name="l00265"></a>00265 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"inplace; pixs1 has colormap"</span>, procName, pixd);
<a name="l00266"></a>00266 <span class="keywordflow">if</span> (pixd && (pixd != pixs1))
<a name="l00267"></a>00267 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixd must be NULL or pixs1"</span>, procName, pixd);
<a name="l00268"></a>00268 <span class="keywordflow">if</span> (fract < 0.0 || fract > 1.0) {
<a name="l00269"></a>00269 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"fract must be in [0.0, 1.0]; setting to 0.5"</span>, procName);
<a name="l00270"></a>00270 fract = 0.5;
<a name="l00271"></a>00271 }
<a name="l00272"></a>00272 <span class="keywordflow">if</span> (type != <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291da8fd0f1d495f371c29d8175c6aac407da">L_BLEND_WITH_INVERSE</a> && type != <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291da885c98d30276d11068bd5b613cbb6510">L_BLEND_TO_WHITE</a> &&
<a name="l00273"></a>00273 type != <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291daa1ef08fc35a77d1716f7c3b7e39acb1c">L_BLEND_TO_BLACK</a>) {
<a name="l00274"></a>00274 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"invalid blend type; setting to L_BLEND_WITH_INVERSE"</span>,
<a name="l00275"></a>00275 procName);
<a name="l00276"></a>00276 type = <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291da8fd0f1d495f371c29d8175c6aac407da">L_BLEND_WITH_INVERSE</a>;
<a name="l00277"></a>00277 }
<a name="l00278"></a>00278
<a name="l00279"></a>00279
<a name="l00280"></a>00280 <span class="comment">/* If pixd != NULL, we know that it is equal to pixs1 and</span>
<a name="l00281"></a>00281 <span class="comment"> * that pixs1 does not have a colormap, so that an in-place operation</span>
<a name="l00282"></a>00282 <span class="comment"> * can be done. Otherwise, remove colormap from pixs1 if</span>
<a name="l00283"></a>00283 <span class="comment"> * it exists and unpack to at least 8 bpp if necessary,</span>
<a name="l00284"></a>00284 <span class="comment"> * to do the blending on a new pix. */</span>
<a name="l00285"></a>00285 <span class="keywordflow">if</span> (!pixd) {
<a name="l00286"></a>00286 pixt1 = <a class="code" href="leptprotos_8h.html#a422b2e45ac5ed1185c1804fdca9f7528">pixRemoveColormap</a>(pixs1, <a class="code" href="pix_8h.html#aabfcbcb5ac86a1edac4035264bc7d2b8a928326b36824c842a5b94c680eab098c">REMOVE_CMAP_BASED_ON_SRC</a>);
<a name="l00287"></a>00287 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixt1) < 8)
<a name="l00288"></a>00288 pixt2 = <a class="code" href="leptprotos_8h.html#a5e10c5c2eec6d2bdd4defa3c48d4331c">pixConvertTo8</a>(pixt1, <a class="code" href="environ_8h.html#aa93f0eb578d23995850d61f7d61c55c1">FALSE</a>);
<a name="l00289"></a>00289 <span class="keywordflow">else</span>
<a name="l00290"></a>00290 pixt2 = <a class="code" href="leptprotos_8h.html#a48c3df1b04f60de6d7fcabd8375250d8">pixClone</a>(pixt1);
<a name="l00291"></a>00291 pixd = <a class="code" href="leptprotos_8h.html#a421e342a65236aa6770965d34101e0ee">pixCopy</a>(<a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, pixt2);
<a name="l00292"></a>00292 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixt1);
<a name="l00293"></a>00293 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixt2);
<a name="l00294"></a>00294 }
<a name="l00295"></a>00295
<a name="l00296"></a>00296 <a class="code" href="leptprotos_8h.html#a11b8bc890f3872b0a19307f4c5a9b41e">pixGetDimensions</a>(pixd, &w, &h, &d); <span class="comment">/* d must be either 8 or 32 bpp */</span>
<a name="l00297"></a>00297 pixc = <a class="code" href="leptprotos_8h.html#a48c3df1b04f60de6d7fcabd8375250d8">pixClone</a>(pixs2);
<a name="l00298"></a>00298 wc = <a class="code" href="leptprotos_8h.html#aa71e0b02548a56e723c76996ab145257">pixGetWidth</a>(pixc);
<a name="l00299"></a>00299 hc = <a class="code" href="leptprotos_8h.html#a511e60efcf1d9f3f59b5308ef5f49a06">pixGetHeight</a>(pixc);
<a name="l00300"></a>00300 datac = <a class="code" href="leptprotos_8h.html#a44546f758f2cf71bb109bfc114e3ca7f">pixGetData</a>(pixc);
<a name="l00301"></a>00301 wplc = <a class="code" href="leptprotos_8h.html#af0b490472ab7999f208098dd37167d73">pixGetWpl</a>(pixc);
<a name="l00302"></a>00302
<a name="l00303"></a>00303 <span class="comment">/* Check limits for src1, in case clipping was not done. */</span>
<a name="l00304"></a>00304 <span class="keywordflow">switch</span> (type)
<a name="l00305"></a>00305 {
<a name="l00306"></a>00306 <span class="keywordflow">case</span> <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291da8fd0f1d495f371c29d8175c6aac407da">L_BLEND_WITH_INVERSE</a>:
<a name="l00307"></a>00307 <span class="comment">/*</span>
<a name="l00308"></a>00308 <span class="comment"> * The core logic for this blending is:</span>
<a name="l00309"></a>00309 <span class="comment"> * p --> (1 - f) * p + f * (1 - p)</span>
<a name="l00310"></a>00310 <span class="comment"> * where p is a normalized value: p = pixval / 255.</span>
<a name="l00311"></a>00311 <span class="comment"> * Thus,</span>
<a name="l00312"></a>00312 <span class="comment"> * p --> p + f * (1 - 2 * p)</span>
<a name="l00313"></a>00313 <span class="comment"> */</span>
<a name="l00314"></a>00314 <span class="keywordflow">for</span> (i = 0; i < hc; i++) {
<a name="l00315"></a>00315 <span class="keywordflow">if</span> (i + y < 0 || i + y >= h) <span class="keywordflow">continue</span>;
<a name="l00316"></a>00316 linec = datac + i * wplc;
<a name="l00317"></a>00317 <span class="keywordflow">for</span> (j = 0; j < wc; j++) {
<a name="l00318"></a>00318 <span class="keywordflow">if</span> (j + x < 0 || j + x >= w) <span class="keywordflow">continue</span>;
<a name="l00319"></a>00319 bval = <a class="code" href="arrayaccess_8h.html#ac76be298c81846741bd3106d13a027b2">GET_DATA_BIT</a>(linec, j);
<a name="l00320"></a>00320 <span class="keywordflow">if</span> (bval) {
<a name="l00321"></a>00321 <span class="keywordflow">switch</span> (d)
<a name="l00322"></a>00322 {
<a name="l00323"></a>00323 <span class="keywordflow">case</span> 8:
<a name="l00324"></a>00324 <a class="code" href="leptprotos_8h.html#a9888f4d973b7bf8516a579e5bdb67d21">pixGetPixel</a>(pixd, x + j, y + i, &pixval);
<a name="l00325"></a>00325 val = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)(pixval + fract * (255 - 2 * pixval));
<a name="l00326"></a>00326 <a class="code" href="leptprotos_8h.html#a1b7576238fbc20a2b6bf2aab8d8d7f6a">pixSetPixel</a>(pixd, x + j, y + i, val);
<a name="l00327"></a>00327 <span class="keywordflow">break</span>;
<a name="l00328"></a>00328 <span class="keywordflow">case</span> 32:
<a name="l00329"></a>00329 <a class="code" href="leptprotos_8h.html#a9888f4d973b7bf8516a579e5bdb67d21">pixGetPixel</a>(pixd, x + j, y + i, &pixval);
<a name="l00330"></a>00330 <a class="code" href="leptprotos_8h.html#a30bcb764e91f0bf1c90ab7fcd93fc33d">extractRGBValues</a>(pixval, &rval, &gval, &bval);
<a name="l00331"></a>00331 rval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)(rval + fract * (255 - 2 * rval));
<a name="l00332"></a>00332 gval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)(gval + fract * (255 - 2 * gval));
<a name="l00333"></a>00333 bval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)(bval + fract * (255 - 2 * bval));
<a name="l00334"></a>00334 <a class="code" href="leptprotos_8h.html#a6f300d6236978e9fba198c760c500c4b">composeRGBPixel</a>(rval, gval, bval, &pixval);
<a name="l00335"></a>00335 <a class="code" href="leptprotos_8h.html#a1b7576238fbc20a2b6bf2aab8d8d7f6a">pixSetPixel</a>(pixd, x + j, y + i, pixval);
<a name="l00336"></a>00336 <span class="keywordflow">break</span>;
<a name="l00337"></a>00337 <span class="keywordflow">default</span>:
<a name="l00338"></a>00338 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"d neither 8 nor 32 bpp; no blend"</span>, procName);
<a name="l00339"></a>00339 }
<a name="l00340"></a>00340 }
<a name="l00341"></a>00341 }
<a name="l00342"></a>00342 }
<a name="l00343"></a>00343 <span class="keywordflow">break</span>;
<a name="l00344"></a>00344 <span class="keywordflow">case</span> <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291da885c98d30276d11068bd5b613cbb6510">L_BLEND_TO_WHITE</a>:
<a name="l00345"></a>00345 <span class="keywordflow">for</span> (i = 0; i < hc; i++) {
<a name="l00346"></a>00346 <span class="keywordflow">if</span> (i + y < 0 || i + y >= h) <span class="keywordflow">continue</span>;
<a name="l00347"></a>00347 linec = datac + i * wplc;
<a name="l00348"></a>00348 <span class="keywordflow">for</span> (j = 0; j < wc; j++) {
<a name="l00349"></a>00349 <span class="keywordflow">if</span> (j + x < 0 || j + x >= w) <span class="keywordflow">continue</span>;
<a name="l00350"></a>00350 bval = <a class="code" href="arrayaccess_8h.html#ac76be298c81846741bd3106d13a027b2">GET_DATA_BIT</a>(linec, j);
<a name="l00351"></a>00351 <span class="keywordflow">if</span> (bval) {
<a name="l00352"></a>00352 <span class="keywordflow">switch</span> (d)
<a name="l00353"></a>00353 {
<a name="l00354"></a>00354 <span class="keywordflow">case</span> 8:
<a name="l00355"></a>00355 <a class="code" href="leptprotos_8h.html#a9888f4d973b7bf8516a579e5bdb67d21">pixGetPixel</a>(pixd, x + j, y + i, &pixval);
<a name="l00356"></a>00356 val = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)(pixval + fract * (255 - pixval));
<a name="l00357"></a>00357 <a class="code" href="leptprotos_8h.html#a1b7576238fbc20a2b6bf2aab8d8d7f6a">pixSetPixel</a>(pixd, x + j, y + i, val);
<a name="l00358"></a>00358 <span class="keywordflow">break</span>;
<a name="l00359"></a>00359 <span class="keywordflow">case</span> 32:
<a name="l00360"></a>00360 <a class="code" href="leptprotos_8h.html#a9888f4d973b7bf8516a579e5bdb67d21">pixGetPixel</a>(pixd, x + j, y + i, &pixval);
<a name="l00361"></a>00361 <a class="code" href="leptprotos_8h.html#a30bcb764e91f0bf1c90ab7fcd93fc33d">extractRGBValues</a>(pixval, &rval, &gval, &bval);
<a name="l00362"></a>00362 rval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)(rval + fract * (255 - rval));
<a name="l00363"></a>00363 gval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)(gval + fract * (255 - gval));
<a name="l00364"></a>00364 bval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)(bval + fract * (255 - bval));
<a name="l00365"></a>00365 <a class="code" href="leptprotos_8h.html#a6f300d6236978e9fba198c760c500c4b">composeRGBPixel</a>(rval, gval, bval, &pixval);
<a name="l00366"></a>00366 <a class="code" href="leptprotos_8h.html#a1b7576238fbc20a2b6bf2aab8d8d7f6a">pixSetPixel</a>(pixd, x + j, y + i, pixval);
<a name="l00367"></a>00367 <span class="keywordflow">break</span>;
<a name="l00368"></a>00368 <span class="keywordflow">default</span>:
<a name="l00369"></a>00369 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"d neither 8 nor 32 bpp; no blend"</span>, procName);
<a name="l00370"></a>00370 }
<a name="l00371"></a>00371 }
<a name="l00372"></a>00372 }
<a name="l00373"></a>00373 }
<a name="l00374"></a>00374 <span class="keywordflow">break</span>;
<a name="l00375"></a>00375 <span class="keywordflow">case</span> <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291daa1ef08fc35a77d1716f7c3b7e39acb1c">L_BLEND_TO_BLACK</a>:
<a name="l00376"></a>00376 <span class="keywordflow">for</span> (i = 0; i < hc; i++) {
<a name="l00377"></a>00377 <span class="keywordflow">if</span> (i + y < 0 || i + y >= h) <span class="keywordflow">continue</span>;
<a name="l00378"></a>00378 linec = datac + i * wplc;
<a name="l00379"></a>00379 <span class="keywordflow">for</span> (j = 0; j < wc; j++) {
<a name="l00380"></a>00380 <span class="keywordflow">if</span> (j + x < 0 || j + x >= w) <span class="keywordflow">continue</span>;
<a name="l00381"></a>00381 bval = <a class="code" href="arrayaccess_8h.html#ac76be298c81846741bd3106d13a027b2">GET_DATA_BIT</a>(linec, j);
<a name="l00382"></a>00382 <span class="keywordflow">if</span> (bval) {
<a name="l00383"></a>00383 <span class="keywordflow">switch</span> (d)
<a name="l00384"></a>00384 {
<a name="l00385"></a>00385 <span class="keywordflow">case</span> 8:
<a name="l00386"></a>00386 <a class="code" href="leptprotos_8h.html#a9888f4d973b7bf8516a579e5bdb67d21">pixGetPixel</a>(pixd, x + j, y + i, &pixval);
<a name="l00387"></a>00387 val = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)((1. - fract) * pixval);
<a name="l00388"></a>00388 <a class="code" href="leptprotos_8h.html#a1b7576238fbc20a2b6bf2aab8d8d7f6a">pixSetPixel</a>(pixd, x + j, y + i, val);
<a name="l00389"></a>00389 <span class="keywordflow">break</span>;
<a name="l00390"></a>00390 <span class="keywordflow">case</span> 32:
<a name="l00391"></a>00391 <a class="code" href="leptprotos_8h.html#a9888f4d973b7bf8516a579e5bdb67d21">pixGetPixel</a>(pixd, x + j, y + i, &pixval);
<a name="l00392"></a>00392 <a class="code" href="leptprotos_8h.html#a30bcb764e91f0bf1c90ab7fcd93fc33d">extractRGBValues</a>(pixval, &rval, &gval, &bval);
<a name="l00393"></a>00393 rval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)((1. - fract) * rval);
<a name="l00394"></a>00394 gval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)((1. - fract) * gval);
<a name="l00395"></a>00395 bval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)((1. - fract) * bval);
<a name="l00396"></a>00396 <a class="code" href="leptprotos_8h.html#a6f300d6236978e9fba198c760c500c4b">composeRGBPixel</a>(rval, gval, bval, &pixval);
<a name="l00397"></a>00397 <a class="code" href="leptprotos_8h.html#a1b7576238fbc20a2b6bf2aab8d8d7f6a">pixSetPixel</a>(pixd, x + j, y + i, pixval);
<a name="l00398"></a>00398 <span class="keywordflow">break</span>;
<a name="l00399"></a>00399 <span class="keywordflow">default</span>:
<a name="l00400"></a>00400 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"d neither 8 nor 32 bpp; no blend"</span>, procName);
<a name="l00401"></a>00401 }
<a name="l00402"></a>00402 }
<a name="l00403"></a>00403 }
<a name="l00404"></a>00404 }
<a name="l00405"></a>00405 <span class="keywordflow">break</span>;
<a name="l00406"></a>00406 <span class="keywordflow">default</span>:
<a name="l00407"></a>00407 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"invalid binary mask blend type"</span>, procName);
<a name="l00408"></a>00408 <span class="keywordflow">break</span>;
<a name="l00409"></a>00409 }
<a name="l00410"></a>00410
<a name="l00411"></a>00411 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixc);
<a name="l00412"></a>00412 <span class="keywordflow">return</span> pixd;
<a name="l00413"></a>00413 }
<a name="l00414"></a>00414
<a name="l00415"></a>00415 <span class="comment"></span>
<a name="l00416"></a>00416 <span class="comment">/*!</span>
<a name="l00417"></a>00417 <span class="comment"> * pixBlendGray()</span>
<a name="l00418"></a>00418 <span class="comment"> *</span>
<a name="l00419"></a>00419 <span class="comment"> * Input: pixd (<optional>; either NULL or equal to pixs1 for in-place)</span>
<a name="l00420"></a>00420 <span class="comment"> * pixs1 (blendee; depth > 1)</span>
<a name="l00421"></a>00421 <span class="comment"> * pixs2 (blender, 8 bpp; typ. smaller in size than pixs1)</span>
<a name="l00422"></a>00422 <span class="comment"> * x,y (origin (UL corner) of pixs2 relative to</span>
<a name="l00423"></a>00423 <span class="comment"> * the origin of pixs1; can be < 0)</span>
<a name="l00424"></a>00424 <span class="comment"> * fract (blending fraction)</span>
<a name="l00425"></a>00425 <span class="comment"> * type (L_BLEND_GRAY, L_BLEND_GRAY_WITH_INVERSE)</span>
<a name="l00426"></a>00426 <span class="comment"> * transparent (1 to use transparency; 0 otherwise)</span>
<a name="l00427"></a>00427 <span class="comment"> * transpix (pixel grayval in pixs2 that is to be transparent)</span>
<a name="l00428"></a>00428 <span class="comment"> * Return: pixd if OK; pixs1 on error</span>
<a name="l00429"></a>00429 <span class="comment"> *</span>
<a name="l00430"></a>00430 <span class="comment"> * Notes:</span>
<a name="l00431"></a>00431 <span class="comment"> * (1) pixs2 must be 8 bpp, and have no colormap.</span>
<a name="l00432"></a>00432 <span class="comment"> * (2) Clipping of pixs2 to pixs1 is done in the inner pixel loop.</span>
<a name="l00433"></a>00433 <span class="comment"> * (3) If pixs1 has a colormap, it is removed.</span>
<a name="l00434"></a>00434 <span class="comment"> * (4) If pixs1 has depth < 8, it is unpacked to generate a 8 bpp pix.</span>
<a name="l00435"></a>00435 <span class="comment"> * (5) For inplace operation, call it this way:</span>
<a name="l00436"></a>00436 <span class="comment"> * pixBlendGray(pixs1, pixs1, pixs2, ...)</span>
<a name="l00437"></a>00437 <span class="comment"> * (6) For generating a new pixd:</span>
<a name="l00438"></a>00438 <span class="comment"> * pixd = pixBlendGray(NULL, pixs1, pixs2, ...)</span>
<a name="l00439"></a>00439 <span class="comment"> * (7) Only call in-place if pixs1 does not have a colormap;</span>
<a name="l00440"></a>00440 <span class="comment"> * otherwise it is an error.</span>
<a name="l00441"></a>00441 <span class="comment"> * (8) If transparent = 0, the blending fraction (fract) is</span>
<a name="l00442"></a>00442 <span class="comment"> * applied equally to all pixels.</span>
<a name="l00443"></a>00443 <span class="comment"> * (9) If transparent = 1, all pixels of value transpix (typically</span>
<a name="l00444"></a>00444 <span class="comment"> * either 0 or 0xff) in pixs2 are transparent in the blend.</span>
<a name="l00445"></a>00445 <span class="comment"> * (10) After processing pixs1, it is either 8 bpp or 32 bpp:</span>
<a name="l00446"></a>00446 <span class="comment"> * - if 8 bpp, the fraction of pixs2 is mixed with pixs1.</span>
<a name="l00447"></a>00447 <span class="comment"> * - if 32 bpp, each component of pixs1 is mixed with</span>
<a name="l00448"></a>00448 <span class="comment"> * the same fraction of pixs2.</span>
<a name="l00449"></a>00449 <span class="comment"> * (11) For L_BLEND_GRAY_WITH_INVERSE, the white values of the blendee</span>
<a name="l00450"></a>00450 <span class="comment"> * (cval == 255 in the code below) result in a delta of 0.</span>
<a name="l00451"></a>00451 <span class="comment"> * Thus, these pixels are intrinsically transparent!</span>
<a name="l00452"></a>00452 <span class="comment"> * The "pivot" value of the src, at which no blending occurs, is</span>
<a name="l00453"></a>00453 <span class="comment"> * 128. Compare with the adaptive pivot in pixBlendGrayAdapt().</span>
<a name="l00454"></a>00454 <span class="comment"> */</span>
<a name="l00455"></a>00455 <a class="code" href="struct_pix.html">PIX</a> *
<a name="l00456"></a><a class="code" href="leptprotos_8h.html#ad47ff8cbe4b933fd7eec5f32efc0e7ba">00456</a> <a class="code" href="blend_8c.html#a4d49fe68f0b6f6c4b487a82a0a78fdd5">pixBlendGray</a>(<a class="code" href="struct_pix.html">PIX</a> *pixd,
<a name="l00457"></a>00457 <a class="code" href="struct_pix.html">PIX</a> *pixs1,
<a name="l00458"></a>00458 <a class="code" href="struct_pix.html">PIX</a> *pixs2,
<a name="l00459"></a>00459 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> x,
<a name="l00460"></a>00460 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> y,
<a name="l00461"></a>00461 <a class="code" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract,
<a name="l00462"></a>00462 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> type,
<a name="l00463"></a>00463 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> transparent,
<a name="l00464"></a>00464 <a class="code" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> transpix)
<a name="l00465"></a>00465 {
<a name="l00466"></a>00466 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> i, j, d, wc, hc, w, h, wplc, wpld, delta;
<a name="l00467"></a>00467 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> ival, irval, igval, ibval, cval, dval;
<a name="l00468"></a>00468 <a class="code" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> val32;
<a name="l00469"></a>00469 <a class="code" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> *linec, *lined, *datac, *datad;
<a name="l00470"></a>00470 <a class="code" href="struct_pix.html">PIX</a> *pixc, *pixt1, *pixt2;
<a name="l00471"></a>00471
<a name="l00472"></a>00472 <a class="code" href="environ_8h.html#a1a16952819bcbc526c998e3ac86f2e78">PROCNAME</a>(<span class="stringliteral">"pixBlendGray"</span>);
<a name="l00473"></a>00473
<a name="l00474"></a>00474 <span class="keywordflow">if</span> (!pixs1)
<a name="l00475"></a>00475 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs1 not defined"</span>, procName, pixd);
<a name="l00476"></a>00476 <span class="keywordflow">if</span> (!pixs2)
<a name="l00477"></a>00477 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs2 not defined"</span>, procName, pixd);
<a name="l00478"></a>00478 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs1) == 1)
<a name="l00479"></a>00479 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs1 is 1 bpp"</span>, procName, pixd);
<a name="l00480"></a>00480 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs2) != 8)
<a name="l00481"></a>00481 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs2 not 8 bpp"</span>, procName, pixd);
<a name="l00482"></a>00482 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a6c959f1c381ebe5a4abc867a3d8ae1e6">pixGetColormap</a>(pixs2))
<a name="l00483"></a>00483 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs2 has a colormap"</span>, procName, pixd);
<a name="l00484"></a>00484 <span class="keywordflow">if</span> (pixd == pixs1 && <a class="code" href="leptprotos_8h.html#a6c959f1c381ebe5a4abc867a3d8ae1e6">pixGetColormap</a>(pixs1))
<a name="l00485"></a>00485 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"can't do in-place with cmap"</span>, procName, pixd);
<a name="l00486"></a>00486 <span class="keywordflow">if</span> (pixd && (pixd != pixs1))
<a name="l00487"></a>00487 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixd must be NULL or pixs1"</span>, procName, pixd);
<a name="l00488"></a>00488 <span class="keywordflow">if</span> (fract < 0.0 || fract > 1.0) {
<a name="l00489"></a>00489 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"fract must be in [0.0, 1.0]; setting to 0.5"</span>, procName);
<a name="l00490"></a>00490 fract = 0.5;
<a name="l00491"></a>00491 }
<a name="l00492"></a>00492 <span class="keywordflow">if</span> (type != <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291da5f7056c3021d9af1f9cc65d9d1dbf7a2">L_BLEND_GRAY</a> && type != <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291dad8b010b4a7f8372a4b36ef2df3dee05f">L_BLEND_GRAY_WITH_INVERSE</a>) {
<a name="l00493"></a>00493 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"invalid blend type; setting to L_BLEND_GRAY"</span>, procName);
<a name="l00494"></a>00494 type = <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291da5f7056c3021d9af1f9cc65d9d1dbf7a2">L_BLEND_GRAY</a>;
<a name="l00495"></a>00495 }
<a name="l00496"></a>00496
<a name="l00497"></a>00497 <span class="comment">/* If pixd != NULL, we know that it is equal to pixs1 and</span>
<a name="l00498"></a>00498 <span class="comment"> * that pixs1 does not have a colormap, so that an in-place operation</span>
<a name="l00499"></a>00499 <span class="comment"> * can be done. Otherwise, remove colormap from pixs1 if</span>
<a name="l00500"></a>00500 <span class="comment"> * it exists and unpack to at least 8 bpp if necessary,</span>
<a name="l00501"></a>00501 <span class="comment"> * to do the blending on a new pix. */</span>
<a name="l00502"></a>00502 <span class="keywordflow">if</span> (!pixd) {
<a name="l00503"></a>00503 pixt1 = <a class="code" href="leptprotos_8h.html#a422b2e45ac5ed1185c1804fdca9f7528">pixRemoveColormap</a>(pixs1, <a class="code" href="pix_8h.html#aabfcbcb5ac86a1edac4035264bc7d2b8a928326b36824c842a5b94c680eab098c">REMOVE_CMAP_BASED_ON_SRC</a>);
<a name="l00504"></a>00504 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixt1) < 8)
<a name="l00505"></a>00505 pixt2 = <a class="code" href="leptprotos_8h.html#a5e10c5c2eec6d2bdd4defa3c48d4331c">pixConvertTo8</a>(pixt1, <a class="code" href="environ_8h.html#aa93f0eb578d23995850d61f7d61c55c1">FALSE</a>);
<a name="l00506"></a>00506 <span class="keywordflow">else</span>
<a name="l00507"></a>00507 pixt2 = <a class="code" href="leptprotos_8h.html#a48c3df1b04f60de6d7fcabd8375250d8">pixClone</a>(pixt1);
<a name="l00508"></a>00508 pixd = <a class="code" href="leptprotos_8h.html#a421e342a65236aa6770965d34101e0ee">pixCopy</a>(<a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, pixt2);
<a name="l00509"></a>00509 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixt1);
<a name="l00510"></a>00510 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixt2);
<a name="l00511"></a>00511 }
<a name="l00512"></a>00512
<a name="l00513"></a>00513 <a class="code" href="leptprotos_8h.html#a11b8bc890f3872b0a19307f4c5a9b41e">pixGetDimensions</a>(pixd, &w, &h, &d); <span class="comment">/* 8 or 32 bpp */</span>
<a name="l00514"></a>00514 wpld = <a class="code" href="leptprotos_8h.html#af0b490472ab7999f208098dd37167d73">pixGetWpl</a>(pixd);
<a name="l00515"></a>00515 datad = <a class="code" href="leptprotos_8h.html#a44546f758f2cf71bb109bfc114e3ca7f">pixGetData</a>(pixd);
<a name="l00516"></a>00516 pixc = <a class="code" href="leptprotos_8h.html#a48c3df1b04f60de6d7fcabd8375250d8">pixClone</a>(pixs2);
<a name="l00517"></a>00517 <a class="code" href="leptprotos_8h.html#a11b8bc890f3872b0a19307f4c5a9b41e">pixGetDimensions</a>(pixc, &wc, &hc, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00518"></a>00518 datac = <a class="code" href="leptprotos_8h.html#a44546f758f2cf71bb109bfc114e3ca7f">pixGetData</a>(pixc);
<a name="l00519"></a>00519 wplc = <a class="code" href="leptprotos_8h.html#af0b490472ab7999f208098dd37167d73">pixGetWpl</a>(pixc);
<a name="l00520"></a>00520
<a name="l00521"></a>00521 <span class="comment">/* check limits for src1, in case clipping was not done */</span>
<a name="l00522"></a>00522 <span class="keywordflow">if</span> (type == <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291da5f7056c3021d9af1f9cc65d9d1dbf7a2">L_BLEND_GRAY</a>) {
<a name="l00523"></a>00523 <span class="keywordflow">for</span> (i = 0; i < hc; i++) {
<a name="l00524"></a>00524 <span class="keywordflow">if</span> (i + y < 0 || i + y >= h) <span class="keywordflow">continue</span>;
<a name="l00525"></a>00525 linec = datac + i * wplc;
<a name="l00526"></a>00526 lined = datad + (i + y) * wpld;
<a name="l00527"></a>00527 <span class="keywordflow">switch</span> (d)
<a name="l00528"></a>00528 {
<a name="l00529"></a>00529 <span class="keywordflow">case</span> 8:
<a name="l00530"></a>00530 <span class="keywordflow">for</span> (j = 0; j < wc; j++) {
<a name="l00531"></a>00531 <span class="keywordflow">if</span> (j + x < 0 || j + x >= w) <span class="keywordflow">continue</span>;
<a name="l00532"></a>00532 cval = <a class="code" href="arrayaccess_8h.html#a9b285094ef3b18d30d8ad13262e61faf">GET_DATA_BYTE</a>(linec, j);
<a name="l00533"></a>00533 <span class="keywordflow">if</span> (transparent == 0 ||
<a name="l00534"></a>00534 (transparent != 0 && cval != transpix)) {
<a name="l00535"></a>00535 dval = <a class="code" href="arrayaccess_8h.html#a9b285094ef3b18d30d8ad13262e61faf">GET_DATA_BYTE</a>(lined, j + x);
<a name="l00536"></a>00536 ival = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)((1. - fract) * dval + fract * cval);
<a name="l00537"></a>00537 <a class="code" href="arrayaccess_8h.html#ab5257b730a14910443765f70e6c3d428">SET_DATA_BYTE</a>(lined, j + x, ival);
<a name="l00538"></a>00538 }
<a name="l00539"></a>00539 }
<a name="l00540"></a>00540 <span class="keywordflow">break</span>;
<a name="l00541"></a>00541 <span class="keywordflow">case</span> 32:
<a name="l00542"></a>00542 <span class="keywordflow">for</span> (j = 0; j < wc; j++) {
<a name="l00543"></a>00543 <span class="keywordflow">if</span> (j + x < 0 || j + x >= w) <span class="keywordflow">continue</span>;
<a name="l00544"></a>00544 cval = <a class="code" href="arrayaccess_8h.html#a9b285094ef3b18d30d8ad13262e61faf">GET_DATA_BYTE</a>(linec, j);
<a name="l00545"></a>00545 <span class="keywordflow">if</span> (transparent == 0 ||
<a name="l00546"></a>00546 (transparent != 0 && cval != transpix)) {
<a name="l00547"></a>00547 val32 = *(lined + j + x);
<a name="l00548"></a>00548 <a class="code" href="leptprotos_8h.html#a30bcb764e91f0bf1c90ab7fcd93fc33d">extractRGBValues</a>(val32, &irval, &igval, &ibval);
<a name="l00549"></a>00549 irval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)((1. - fract) * irval + fract * cval);
<a name="l00550"></a>00550 igval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)((1. - fract) * igval + fract * cval);
<a name="l00551"></a>00551 ibval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)((1. - fract) * ibval + fract * cval);
<a name="l00552"></a>00552 <a class="code" href="leptprotos_8h.html#a6f300d6236978e9fba198c760c500c4b">composeRGBPixel</a>(irval, igval, ibval, &val32);
<a name="l00553"></a>00553 *(lined + j + x) = val32;
<a name="l00554"></a>00554 }
<a name="l00555"></a>00555 }
<a name="l00556"></a>00556 <span class="keywordflow">break</span>;
<a name="l00557"></a>00557 <span class="keywordflow">default</span>:
<a name="l00558"></a>00558 <span class="keywordflow">break</span>; <span class="comment">/* shouldn't happen */</span>
<a name="l00559"></a>00559 }
<a name="l00560"></a>00560 }
<a name="l00561"></a>00561 }
<a name="l00562"></a>00562 <span class="keywordflow">else</span> { <span class="comment">/* L_BLEND_GRAY_WITH_INVERSE */</span>
<a name="l00563"></a>00563 <span class="keywordflow">for</span> (i = 0; i < hc; i++) {
<a name="l00564"></a>00564 <span class="keywordflow">if</span> (i + y < 0 || i + y >= h) <span class="keywordflow">continue</span>;
<a name="l00565"></a>00565 linec = datac + i * wplc;
<a name="l00566"></a>00566 lined = datad + (i + y) * wpld;
<a name="l00567"></a>00567 <span class="keywordflow">switch</span> (d)
<a name="l00568"></a>00568 {
<a name="l00569"></a>00569 <span class="keywordflow">case</span> 8:
<a name="l00570"></a>00570 <span class="comment">/*</span>
<a name="l00571"></a>00571 <span class="comment"> * For 8 bpp, the dest pix is shifted by a signed amount</span>
<a name="l00572"></a>00572 <span class="comment"> * proportional to the distance from 128 (the pivot value),</span>
<a name="l00573"></a>00573 <span class="comment"> * and to the darkness of src2. If the dest is darker</span>
<a name="l00574"></a>00574 <span class="comment"> * than 128, it becomes lighter, and v.v.</span>
<a name="l00575"></a>00575 <span class="comment"> * The basic logic is:</span>
<a name="l00576"></a>00576 <span class="comment"> * d --> d + f * (0.5 - d) * (1 - c)</span>
<a name="l00577"></a>00577 <span class="comment"> * where d and c are normalized pixel values for src1 and</span>
<a name="l00578"></a>00578 <span class="comment"> * src2, respectively, with normalization to 255.</span>
<a name="l00579"></a>00579 <span class="comment"> */</span>
<a name="l00580"></a>00580 <span class="keywordflow">for</span> (j = 0; j < wc; j++) {
<a name="l00581"></a>00581 <span class="keywordflow">if</span> (j + x < 0 || j + x >= w) <span class="keywordflow">continue</span>;
<a name="l00582"></a>00582 cval = <a class="code" href="arrayaccess_8h.html#a9b285094ef3b18d30d8ad13262e61faf">GET_DATA_BYTE</a>(linec, j);
<a name="l00583"></a>00583 <span class="keywordflow">if</span> (transparent == 0 ||
<a name="l00584"></a>00584 (transparent != 0 && cval != transpix)) {
<a name="l00585"></a>00585 ival = <a class="code" href="arrayaccess_8h.html#a9b285094ef3b18d30d8ad13262e61faf">GET_DATA_BYTE</a>(lined, j + x);
<a name="l00586"></a>00586 delta = (128 - ival) * (255 - cval) / 256;
<a name="l00587"></a>00587 ival += (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)(fract * delta + 0.5);
<a name="l00588"></a>00588 <a class="code" href="arrayaccess_8h.html#ab5257b730a14910443765f70e6c3d428">SET_DATA_BYTE</a>(lined, j + x, ival);
<a name="l00589"></a>00589 }
<a name="l00590"></a>00590 }
<a name="l00591"></a>00591 <span class="keywordflow">break</span>;
<a name="l00592"></a>00592 <span class="keywordflow">case</span> 32:
<a name="l00593"></a>00593 <span class="comment">/* Each component is shifted by the same formula for 8 bpp */</span>
<a name="l00594"></a>00594 <span class="keywordflow">for</span> (j = 0; j < wc; j++) {
<a name="l00595"></a>00595 <span class="keywordflow">if</span> (j + x < 0 || j + x >= w) <span class="keywordflow">continue</span>;
<a name="l00596"></a>00596 cval = <a class="code" href="arrayaccess_8h.html#a9b285094ef3b18d30d8ad13262e61faf">GET_DATA_BYTE</a>(linec, j);
<a name="l00597"></a>00597 <span class="keywordflow">if</span> (transparent == 0 ||
<a name="l00598"></a>00598 (transparent != 0 && cval != transpix)) {
<a name="l00599"></a>00599 val32 = *(lined + j + x);
<a name="l00600"></a>00600 <a class="code" href="leptprotos_8h.html#a30bcb764e91f0bf1c90ab7fcd93fc33d">extractRGBValues</a>(val32, &irval, &igval, &ibval);
<a name="l00601"></a>00601 delta = (128 - irval) * (255 - cval) / 256;
<a name="l00602"></a>00602 irval += (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)(fract * delta + 0.5);
<a name="l00603"></a>00603 delta = (128 - igval) * (255 - cval) / 256;
<a name="l00604"></a>00604 igval += (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)(fract * delta + 0.5);
<a name="l00605"></a>00605 delta = (128 - ibval) * (255 - cval) / 256;
<a name="l00606"></a>00606 ibval += (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)(fract * delta + 0.5);
<a name="l00607"></a>00607 <a class="code" href="leptprotos_8h.html#a6f300d6236978e9fba198c760c500c4b">composeRGBPixel</a>(irval, igval, ibval, &val32);
<a name="l00608"></a>00608 *(lined + j + x) = val32;
<a name="l00609"></a>00609 }
<a name="l00610"></a>00610 }
<a name="l00611"></a>00611 <span class="keywordflow">break</span>;
<a name="l00612"></a>00612 <span class="keywordflow">default</span>:
<a name="l00613"></a>00613 <span class="keywordflow">break</span>; <span class="comment">/* shouldn't happen */</span>
<a name="l00614"></a>00614 }
<a name="l00615"></a>00615 }
<a name="l00616"></a>00616 }
<a name="l00617"></a>00617
<a name="l00618"></a>00618 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixc);
<a name="l00619"></a>00619 <span class="keywordflow">return</span> pixd;
<a name="l00620"></a>00620 }
<a name="l00621"></a>00621
<a name="l00622"></a>00622 <span class="comment"></span>
<a name="l00623"></a>00623 <span class="comment">/*!</span>
<a name="l00624"></a>00624 <span class="comment"> * pixBlendColor()</span>
<a name="l00625"></a>00625 <span class="comment"> *</span>
<a name="l00626"></a>00626 <span class="comment"> * Input: pixd (<optional>; either NULL or equal to pixs1 for in-place)</span>
<a name="l00627"></a>00627 <span class="comment"> * pixs1 (blendee; depth > 1)</span>
<a name="l00628"></a>00628 <span class="comment"> * pixs2 (blender, 32 bpp; typ. smaller in size than pixs1)</span>
<a name="l00629"></a>00629 <span class="comment"> * x,y (origin (UL corner) of pixs2 relative to</span>
<a name="l00630"></a>00630 <span class="comment"> * the origin of pixs1)</span>
<a name="l00631"></a>00631 <span class="comment"> * fract (blending fraction)</span>
<a name="l00632"></a>00632 <span class="comment"> * transparent (1 to use transparency; 0 otherwise)</span>
<a name="l00633"></a>00633 <span class="comment"> * transpix (pixel color in pixs2 that is to be transparent)</span>
<a name="l00634"></a>00634 <span class="comment"> * Return: pixd if OK; pixs1 on error</span>
<a name="l00635"></a>00635 <span class="comment"> *</span>
<a name="l00636"></a>00636 <span class="comment"> * Notes:</span>
<a name="l00637"></a>00637 <span class="comment"> * (1) pixs2 must be 32 bpp, and have no colormap.</span>
<a name="l00638"></a>00638 <span class="comment"> * (2) Clipping of pixs2 to pixs1 is done in the inner pixel loop.</span>
<a name="l00639"></a>00639 <span class="comment"> * (3) If pixs1 has a colormap, it is removed to generate a 32 bpp pix.</span>
<a name="l00640"></a>00640 <span class="comment"> * (4) If pixs1 has depth < 32, it is unpacked to generate a 32 bpp pix.</span>
<a name="l00641"></a>00641 <span class="comment"> * (5) For inplace operation, call it this way:</span>
<a name="l00642"></a>00642 <span class="comment"> * pixBlendColor(pixs1, pixs1, pixs2, ...)</span>
<a name="l00643"></a>00643 <span class="comment"> * (6) For generating a new pixd:</span>
<a name="l00644"></a>00644 <span class="comment"> * pixd = pixBlendColor(NULL, pixs1, pixs2, ...)</span>
<a name="l00645"></a>00645 <span class="comment"> * (7) Only call in-place if pixs1 is 32 bpp; otherwise it is an error.</span>
<a name="l00646"></a>00646 <span class="comment"> * (8) If transparent = 0, the blending fraction (fract) is</span>
<a name="l00647"></a>00647 <span class="comment"> * applied equally to all pixels.</span>
<a name="l00648"></a>00648 <span class="comment"> * (9) If transparent = 1, all pixels of value transpix (typically</span>
<a name="l00649"></a>00649 <span class="comment"> * either 0 or 0xffffff00) in pixs2 are transparent in the blend.</span>
<a name="l00650"></a>00650 <span class="comment"> */</span>
<a name="l00651"></a>00651 <a class="code" href="struct_pix.html">PIX</a> *
<a name="l00652"></a><a class="code" href="leptprotos_8h.html#aaca0d5850385bb1cf5338b656cde0c85">00652</a> <a class="code" href="blend_8c.html#a35ed557a91a1ad527ef4a6c00e91e6a1">pixBlendColor</a>(<a class="code" href="struct_pix.html">PIX</a> *pixd,
<a name="l00653"></a>00653 <a class="code" href="struct_pix.html">PIX</a> *pixs1,
<a name="l00654"></a>00654 <a class="code" href="struct_pix.html">PIX</a> *pixs2,
<a name="l00655"></a>00655 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> x,
<a name="l00656"></a>00656 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> y,
<a name="l00657"></a>00657 <a class="code" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract,
<a name="l00658"></a>00658 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> transparent,
<a name="l00659"></a>00659 <a class="code" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> transpix)
<a name="l00660"></a>00660 {
<a name="l00661"></a>00661 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> i, j, wc, hc, w, h, wplc, wpld;
<a name="l00662"></a>00662 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> rval, gval, bval, rcval, gcval, bcval;
<a name="l00663"></a>00663 <a class="code" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> cval32, val32;
<a name="l00664"></a>00664 <a class="code" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> *linec, *lined, *datac, *datad;
<a name="l00665"></a>00665 <a class="code" href="struct_pix.html">PIX</a> *pixc, *pixt1, *pixt2;
<a name="l00666"></a>00666
<a name="l00667"></a>00667 <a class="code" href="environ_8h.html#a1a16952819bcbc526c998e3ac86f2e78">PROCNAME</a>(<span class="stringliteral">"pixBlendColor"</span>);
<a name="l00668"></a>00668
<a name="l00669"></a>00669 <span class="keywordflow">if</span> (!pixs1)
<a name="l00670"></a>00670 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs1 not defined"</span>, procName, pixd);
<a name="l00671"></a>00671 <span class="keywordflow">if</span> (!pixs2)
<a name="l00672"></a>00672 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs2 not defined"</span>, procName, pixd);
<a name="l00673"></a>00673 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs1) == 1)
<a name="l00674"></a>00674 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs1 is 1 bpp"</span>, procName, pixd);
<a name="l00675"></a>00675 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs2) != 32)
<a name="l00676"></a>00676 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs2 not 32 bpp"</span>, procName, pixd);
<a name="l00677"></a>00677 <span class="keywordflow">if</span> (pixd == pixs1 && <a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs1) != 32)
<a name="l00678"></a>00678 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"inplace; pixs1 not 32 bpp"</span>, procName, pixd);
<a name="l00679"></a>00679 <span class="keywordflow">if</span> (pixd && (pixd != pixs1))
<a name="l00680"></a>00680 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixd must be NULL or pixs1"</span>, procName, pixd);
<a name="l00681"></a>00681 <span class="keywordflow">if</span> (fract < 0.0 || fract > 1.0) {
<a name="l00682"></a>00682 <a class="code" href="environ_8h.html#a80ea4add6888dc55f0f6af9c488f1f21">L_WARNING</a>(<span class="stringliteral">"fract must be in [0.0, 1.0]; setting to 0.5"</span>, procName);
<a name="l00683"></a>00683 fract = 0.5;
<a name="l00684"></a>00684 }
<a name="l00685"></a>00685
<a name="l00686"></a>00686 <span class="comment">/* If pixd != NULL, we know that it is equal to pixs1 and</span>
<a name="l00687"></a>00687 <span class="comment"> * that pixs1 is 32 bpp rgb, so that an in-place operation</span>
<a name="l00688"></a>00688 <span class="comment"> * can be done. Otherwise, remove colormap from pixs1 if</span>
<a name="l00689"></a>00689 <span class="comment"> * it exists and unpack to 32 bpp if necessary, to do the</span>
<a name="l00690"></a>00690 <span class="comment"> * blending on a new 32 bpp Pix. */</span>
<a name="l00691"></a>00691 <span class="keywordflow">if</span> (!pixd) {
<a name="l00692"></a>00692 pixt1 = <a class="code" href="leptprotos_8h.html#a422b2e45ac5ed1185c1804fdca9f7528">pixRemoveColormap</a>(pixs1, <a class="code" href="pix_8h.html#aabfcbcb5ac86a1edac4035264bc7d2b8a117378efb1cef9ca7f34edcfb6363544">REMOVE_CMAP_TO_FULL_COLOR</a>);
<a name="l00693"></a>00693 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixt1) < 32)
<a name="l00694"></a>00694 pixt2 = <a class="code" href="leptprotos_8h.html#a14716dd95fae40ec7838dc3db6783473">pixConvertTo32</a>(pixt1);
<a name="l00695"></a>00695 <span class="keywordflow">else</span>
<a name="l00696"></a>00696 pixt2 = <a class="code" href="leptprotos_8h.html#a48c3df1b04f60de6d7fcabd8375250d8">pixClone</a>(pixt1);
<a name="l00697"></a>00697 pixd = <a class="code" href="leptprotos_8h.html#a421e342a65236aa6770965d34101e0ee">pixCopy</a>(<a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, pixt2);
<a name="l00698"></a>00698 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixt1);
<a name="l00699"></a>00699 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixt2);
<a name="l00700"></a>00700 }
<a name="l00701"></a>00701
<a name="l00702"></a>00702 <a class="code" href="leptprotos_8h.html#a11b8bc890f3872b0a19307f4c5a9b41e">pixGetDimensions</a>(pixd, &w, &h, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00703"></a>00703 wpld = <a class="code" href="leptprotos_8h.html#af0b490472ab7999f208098dd37167d73">pixGetWpl</a>(pixd);
<a name="l00704"></a>00704 datad = <a class="code" href="leptprotos_8h.html#a44546f758f2cf71bb109bfc114e3ca7f">pixGetData</a>(pixd);
<a name="l00705"></a>00705 pixc = <a class="code" href="leptprotos_8h.html#a48c3df1b04f60de6d7fcabd8375250d8">pixClone</a>(pixs2);
<a name="l00706"></a>00706 <a class="code" href="leptprotos_8h.html#a11b8bc890f3872b0a19307f4c5a9b41e">pixGetDimensions</a>(pixc, &wc, &hc, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00707"></a>00707 datac = <a class="code" href="leptprotos_8h.html#a44546f758f2cf71bb109bfc114e3ca7f">pixGetData</a>(pixc);
<a name="l00708"></a>00708 wplc = <a class="code" href="leptprotos_8h.html#af0b490472ab7999f208098dd37167d73">pixGetWpl</a>(pixc);
<a name="l00709"></a>00709
<a name="l00710"></a>00710 <span class="comment">/* check limits for src1, in case clipping was not done */</span>
<a name="l00711"></a>00711 <span class="keywordflow">for</span> (i = 0; i < hc; i++) {
<a name="l00712"></a>00712 <span class="keywordflow">if</span> (i + y < 0 || i + y >= h) <span class="keywordflow">continue</span>;
<a name="l00713"></a>00713 linec = datac + i * wplc;
<a name="l00714"></a>00714 lined = datad + (i + y) * wpld;
<a name="l00715"></a>00715 <span class="keywordflow">for</span> (j = 0; j < wc; j++) {
<a name="l00716"></a>00716 <span class="keywordflow">if</span> (j + x < 0 || j + x >= w) <span class="keywordflow">continue</span>;
<a name="l00717"></a>00717 cval32 = *(linec + j);
<a name="l00718"></a>00718 <span class="keywordflow">if</span> (transparent == 0 ||
<a name="l00719"></a>00719 (transparent != 0 &&
<a name="l00720"></a>00720 ((cval32 & 0xffffff00) != (transpix & 0xffffff00)))) {
<a name="l00721"></a>00721 val32 = *(lined + j + x);
<a name="l00722"></a>00722 <a class="code" href="leptprotos_8h.html#a30bcb764e91f0bf1c90ab7fcd93fc33d">extractRGBValues</a>(cval32, &rcval, &gcval, &bcval);
<a name="l00723"></a>00723 <a class="code" href="leptprotos_8h.html#a30bcb764e91f0bf1c90ab7fcd93fc33d">extractRGBValues</a>(val32, &rval, &gval, &bval);
<a name="l00724"></a>00724 rval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)((1. - fract) * rval + fract * rcval);
<a name="l00725"></a>00725 gval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)((1. - fract) * gval + fract * gcval);
<a name="l00726"></a>00726 bval = (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)((1. - fract) * bval + fract * bcval);
<a name="l00727"></a>00727 <a class="code" href="leptprotos_8h.html#a6f300d6236978e9fba198c760c500c4b">composeRGBPixel</a>(rval, gval, bval, &val32);
<a name="l00728"></a>00728 *(lined + j + x) = val32;
<a name="l00729"></a>00729 }
<a name="l00730"></a>00730 }
<a name="l00731"></a>00731 }
<a name="l00732"></a>00732
<a name="l00733"></a>00733 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixc);
<a name="l00734"></a>00734 <span class="keywordflow">return</span> pixd;
<a name="l00735"></a>00735 }
<a name="l00736"></a>00736
<a name="l00737"></a>00737
<a name="l00738"></a>00738 <span class="comment">/*</span>
<a name="l00739"></a>00739 <span class="comment"> * pixBlendColorByChannel()</span>
<a name="l00740"></a>00740 <span class="comment"> *</span>
<a name="l00741"></a>00741 <span class="comment"> * This is an extended version of pixBlendColor. All parameters have the</span>
<a name="l00742"></a>00742 <span class="comment"> * same meaning except it takes one mixing fraction per channel, and the</span>
<a name="l00743"></a>00743 <span class="comment"> * mixing fraction may be < 0 or > 1, in which case, the min or max of two</span>
<a name="l00744"></a>00744 <span class="comment"> * images are taken. More specifically,</span>
<a name="l00745"></a>00745 <span class="comment"> *</span>
<a name="l00746"></a>00746 <span class="comment"> * for a = pixs1[i], b = pixs2[i]:</span>
<a name="l00747"></a>00747 <span class="comment"> * frac < 0.0 --> min(a, b)</span>
<a name="l00748"></a>00748 <span class="comment"> * frac > 1.0 --> max(a, b)</span>
<a name="l00749"></a>00749 <span class="comment"> * else --> (1-frac)*a + frac*b</span>
<a name="l00750"></a>00750 <span class="comment"> * frac == 0 --> a</span>
<a name="l00751"></a>00751 <span class="comment"> * frac == 1 --> b</span>
<a name="l00752"></a>00752 <span class="comment"> *</span>
<a name="l00753"></a>00753 <span class="comment"> * Notes:</span>
<a name="l00754"></a>00754 <span class="comment"> * (1) See usage notes in pixBlendColor()</span>
<a name="l00755"></a>00755 <span class="comment"> * (2) pixBlendColor() would be equivalent to</span>
<a name="l00756"></a>00756 <span class="comment"> * pixBlendColorChannel(..., fract, fract, fract, ...);</span>
<a name="l00757"></a>00757 <span class="comment"> * at a small cost of efficiency.</span>
<a name="l00758"></a>00758 <span class="comment"> */</span>
<a name="l00759"></a>00759 <a class="code" href="struct_pix.html">PIX</a> *
<a name="l00760"></a><a class="code" href="leptprotos_8h.html#a4a1560de9d681b6d28ba861861e4ac2f">00760</a> <a class="code" href="blend_8c.html#a73515ff61cf772d6f6d93579a876b53e">pixBlendColorByChannel</a>(<a class="code" href="struct_pix.html">PIX</a> *pixd,
<a name="l00761"></a>00761 <a class="code" href="struct_pix.html">PIX</a> *pixs1,
<a name="l00762"></a>00762 <a class="code" href="struct_pix.html">PIX</a> *pixs2,
<a name="l00763"></a>00763 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> x,
<a name="l00764"></a>00764 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> y,
<a name="l00765"></a>00765 <a class="code" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> rfract,
<a name="l00766"></a>00766 <a class="code" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> gfract,
<a name="l00767"></a>00767 <a class="code" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> bfract,
<a name="l00768"></a>00768 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> transparent,
<a name="l00769"></a>00769 <a class="code" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> transpix)
<a name="l00770"></a>00770 {
<a name="l00771"></a>00771 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> i, j, wc, hc, w, h, wplc, wpld;
<a name="l00772"></a>00772 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> rval, gval, bval, rcval, gcval, bcval;
<a name="l00773"></a>00773 <a class="code" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> cval32, val32;
<a name="l00774"></a>00774 <a class="code" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> *linec, *lined, *datac, *datad;
<a name="l00775"></a>00775 <a class="code" href="struct_pix.html">PIX</a> *pixc, *pixt1, *pixt2;
<a name="l00776"></a>00776
<a name="l00777"></a>00777 <a class="code" href="environ_8h.html#a1a16952819bcbc526c998e3ac86f2e78">PROCNAME</a>(<span class="stringliteral">"pixBlendColorByChannel"</span>);
<a name="l00778"></a>00778
<a name="l00779"></a>00779 <span class="keywordflow">if</span> (!pixs1)
<a name="l00780"></a>00780 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs1 not defined"</span>, procName, pixd);
<a name="l00781"></a>00781 <span class="keywordflow">if</span> (!pixs2)
<a name="l00782"></a>00782 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs2 not defined"</span>, procName, pixd);
<a name="l00783"></a>00783 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs1) == 1)
<a name="l00784"></a>00784 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs1 is 1 bpp"</span>, procName, pixd);
<a name="l00785"></a>00785 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs2) != 32)
<a name="l00786"></a>00786 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixs2 not 32 bpp"</span>, procName, pixd);
<a name="l00787"></a>00787 <span class="keywordflow">if</span> (pixd == pixs1 && <a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixs1) != 32)
<a name="l00788"></a>00788 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"inplace; pixs1 not 32 bpp"</span>, procName, pixd);
<a name="l00789"></a>00789 <span class="keywordflow">if</span> (pixd && (pixd != pixs1))
<a name="l00790"></a>00790 <span class="keywordflow">return</span> (<a class="code" href="struct_pix.html">PIX</a> *)<a class="code" href="environ_8h.html#a38a8310a83847948c9ce6620983be468">ERROR_PTR</a>(<span class="stringliteral">"pixd must be NULL or pixs1"</span>, procName, pixd);
<a name="l00791"></a>00791
<a name="l00792"></a>00792 <span class="comment">/* If pixd != NULL, we know that it is equal to pixs1 and</span>
<a name="l00793"></a>00793 <span class="comment"> * that pixs1 is 32 bpp rgb, so that an in-place operation</span>
<a name="l00794"></a>00794 <span class="comment"> * can be done. Otherwise, remove colormap from pixs1 if</span>
<a name="l00795"></a>00795 <span class="comment"> * it exists and unpack to 32 bpp if necessary, to do the</span>
<a name="l00796"></a>00796 <span class="comment"> * blending on a new 32 bpp Pix. */</span>
<a name="l00797"></a>00797 <span class="keywordflow">if</span> (!pixd) {
<a name="l00798"></a>00798 pixt1 = <a class="code" href="leptprotos_8h.html#a422b2e45ac5ed1185c1804fdca9f7528">pixRemoveColormap</a>(pixs1, <a class="code" href="pix_8h.html#aabfcbcb5ac86a1edac4035264bc7d2b8a117378efb1cef9ca7f34edcfb6363544">REMOVE_CMAP_TO_FULL_COLOR</a>);
<a name="l00799"></a>00799 <span class="keywordflow">if</span> (<a class="code" href="leptprotos_8h.html#a1646270a1eae38cd7af74c68351ce513">pixGetDepth</a>(pixt1) < 32)
<a name="l00800"></a>00800 pixt2 = <a class="code" href="leptprotos_8h.html#a14716dd95fae40ec7838dc3db6783473">pixConvertTo32</a>(pixt1);
<a name="l00801"></a>00801 <span class="keywordflow">else</span>
<a name="l00802"></a>00802 pixt2 = <a class="code" href="leptprotos_8h.html#a48c3df1b04f60de6d7fcabd8375250d8">pixClone</a>(pixt1);
<a name="l00803"></a>00803 pixd = <a class="code" href="leptprotos_8h.html#a421e342a65236aa6770965d34101e0ee">pixCopy</a>(<a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, pixt2);
<a name="l00804"></a>00804 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixt1);
<a name="l00805"></a>00805 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixt2);
<a name="l00806"></a>00806 }
<a name="l00807"></a>00807
<a name="l00808"></a>00808 <a class="code" href="leptprotos_8h.html#a11b8bc890f3872b0a19307f4c5a9b41e">pixGetDimensions</a>(pixd, &w, &h, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00809"></a>00809 wpld = <a class="code" href="leptprotos_8h.html#af0b490472ab7999f208098dd37167d73">pixGetWpl</a>(pixd);
<a name="l00810"></a>00810 datad = <a class="code" href="leptprotos_8h.html#a44546f758f2cf71bb109bfc114e3ca7f">pixGetData</a>(pixd);
<a name="l00811"></a>00811 pixc = <a class="code" href="leptprotos_8h.html#a48c3df1b04f60de6d7fcabd8375250d8">pixClone</a>(pixs2);
<a name="l00812"></a>00812 <a class="code" href="leptprotos_8h.html#a11b8bc890f3872b0a19307f4c5a9b41e">pixGetDimensions</a>(pixc, &wc, &hc, <a class="code" href="environ_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);
<a name="l00813"></a>00813 datac = <a class="code" href="leptprotos_8h.html#a44546f758f2cf71bb109bfc114e3ca7f">pixGetData</a>(pixc);
<a name="l00814"></a>00814 wplc = <a class="code" href="leptprotos_8h.html#af0b490472ab7999f208098dd37167d73">pixGetWpl</a>(pixc);
<a name="l00815"></a>00815
<a name="l00816"></a>00816 <span class="comment">/* Check limits for src1, in case clipping was not done */</span>
<a name="l00817"></a>00817 <span class="keywordflow">for</span> (i = 0; i < hc; i++) {
<a name="l00818"></a>00818 <span class="keywordflow">if</span> (i + y < 0 || i + y >= h) <span class="keywordflow">continue</span>;
<a name="l00819"></a>00819 linec = datac + i * wplc;
<a name="l00820"></a>00820 lined = datad + (i + y) * wpld;
<a name="l00821"></a>00821 <span class="keywordflow">for</span> (j = 0; j < wc; j++) {
<a name="l00822"></a>00822 <span class="keywordflow">if</span> (j + x < 0 || j + x >= w) <span class="keywordflow">continue</span>;
<a name="l00823"></a>00823 cval32 = *(linec + j);
<a name="l00824"></a>00824 <span class="keywordflow">if</span> (transparent == 0 ||
<a name="l00825"></a>00825 (transparent != 0 &&
<a name="l00826"></a>00826 ((cval32 & 0xffffff00) != (transpix & 0xffffff00)))) {
<a name="l00827"></a>00827 val32 = *(lined + j + x);
<a name="l00828"></a>00828 <a class="code" href="leptprotos_8h.html#a30bcb764e91f0bf1c90ab7fcd93fc33d">extractRGBValues</a>(cval32, &rcval, &gcval, &bcval);
<a name="l00829"></a>00829 <a class="code" href="leptprotos_8h.html#a30bcb764e91f0bf1c90ab7fcd93fc33d">extractRGBValues</a>(val32, &rval, &gval, &bval);
<a name="l00830"></a>00830 rval = <a class="code" href="blend_8c.html#ad12eec2ea8dff86628c6d5717214da66">blendComponents</a>(rval, rcval, rfract);
<a name="l00831"></a>00831 gval = <a class="code" href="blend_8c.html#ad12eec2ea8dff86628c6d5717214da66">blendComponents</a>(gval, gcval, gfract);
<a name="l00832"></a>00832 bval = <a class="code" href="blend_8c.html#ad12eec2ea8dff86628c6d5717214da66">blendComponents</a>(bval, bcval, bfract);
<a name="l00833"></a>00833 <a class="code" href="leptprotos_8h.html#a6f300d6236978e9fba198c760c500c4b">composeRGBPixel</a>(rval, gval, bval, &val32);
<a name="l00834"></a>00834 *(lined + j + x) = val32;
<a name="l00835"></a>00835 }
<a name="l00836"></a>00836 }
<a name="l00837"></a>00837 }
<a name="l00838"></a>00838
<a name="l00839"></a>00839 <a class="code" href="leptprotos_8h.html#a1b238e61b64e4e5c62f44849cddb9658">pixDestroy</a>(&pixc);
<a name="l00840"></a>00840 <span class="keywordflow">return</span> pixd;
<a name="l00841"></a>00841 }
<a name="l00842"></a>00842
<a name="l00843"></a>00843
<a name="l00844"></a>00844 <span class="keyword">static</span> <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>
<a name="l00845"></a><a class="code" href="blend_8c.html#ad12eec2ea8dff86628c6d5717214da66">00845</a> <a class="code" href="blend_8c.html#ad12eec2ea8dff86628c6d5717214da66">blendComponents</a>(<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> a,
<a name="l00846"></a>00846 <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> b,
<a name="l00847"></a>00847 <a class="code" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract)
<a name="l00848"></a>00848 {
<a name="l00849"></a>00849 <span class="keywordflow">if</span> (fract < 0.)
<a name="l00850"></a>00850 <span class="keywordflow">return</span> ((a < b) ? a : b);
<a name="l00851"></a>00851 <span class="keywordflow">if</span> (fract > 1.)
<a name="l00852"></a>00852 <span class="keywordflow">return</span> ((a > b) ? a : b);
<a name="l00853"></a>00853 <span class="keywordflow">return</span> (<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a>)((1. - fract) * a + fract * b);
<a name="l00854"></a>00854 }
<a name="l00855"></a>00855
<a name="l00856"></a>00856 <span class="comment"></span>
<a name="l00857"></a>00857 <span class="comment">/*!</span>
<a name="l00858"></a>00858 <span class="comment"> * pixBlendGrayAdapt()</span>
<a name="l00859"></a>00859 <span class="comment"> *</span>
<a name="l00860"></a>00860 <span class="comment"> * Input: pixd (<optional>; either NULL or equal to pixs1 for in-place)</span>
<a name="l00861"></a>00861 <span class="comment"> * pixs1 (blendee; depth > 1)</span>
<a name="l00862"></a>00862 <span class="comment"> * pixs2 (blender, 8 bpp; typ. smaller in size than pixs1)</span>
<a name="l00863"></a>00863 <span class="comment"> * x,y (origin (UL corner) of pixs2 relative to</span>
<a name="l00864"></a>00864 <span class="comment"> * the origin of pixs1; can be < 0)</span>
<a name="l00865"></a>00865 <span class="comment"> * fract (blending fraction)</span>
<a name="l00866"></a>00866 <span class="comment"> * shift (>= 0 but <= 128: shift of zero blend value from</span>
<a name="l00867"></a>00867 <span class="comment"> * median source; use -1 for default value; )</span>
<a name="l00868"></a>00868 <span class="comment"> * Return: pixd if OK; pixs1 on error</span>
<a name="l00869"></a>00869 <span class="comment"> *</span>
<a name="l00870"></a>00870 <span class="comment"> * Notes:</span>
<a name="l00871"></a>00871 <span class="comment"> * (1) pixs2 must be 8 bpp, and have no colormap.</span>
<a name="l00872"></a>00872 <span class="comment"> * (2) Clipping of pixs2 to pixs1 is done in the inner pixel loop.</span>
<a name="l00873"></a>00873 <span class="comment"> * (3) If pixs1 has a colormap, it is removed.</span>
<a name="l00874"></a>00874 <span class="comment"> * (4) If pixs1 has depth < 8, it is unpacked to generate a 8 bpp pix.</span>
<a name="l00875"></a>00875 <span class="comment"> * (5) For inplace operation, call it this way:</span>
<a name="l00876"></a>00876 <span class="comment"> * pixBlendGray(pixs1, pixs1, pixs2, ...)</span>
<a name="l00877"></a>00877 <span class="comment"> * For generating a new pixd:</span>
<a name="l00878"></a>00878 <span class="comment"> * pixd = pixBlendGray(NULL, pixs1, pixs2, ...)</span>