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  23 <h1>bmp.cc</h1><a href="bmp_8cc.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">///</span>
  24 <a name="l00002"></a>00002 <span class="comment"></span><span class="comment">/// \file       bmp.cc</span>
  25 <a name="l00003"></a>00003 <span class="comment"></span><span class="comment">///             BMP conversion routines</span>
  26 <a name="l00004"></a>00004 <span class="comment"></span><span class="comment">///</span>
  27 <a name="l00005"></a>00005 <span class="comment"></span>
  28 <a name="l00006"></a>00006 <span class="comment">/*</span>
  29 <a name="l00007"></a>00007 <span class="comment">    Copyright (C) 2009-2011, Net Direct Inc. (http://www.netdirect.ca/)</span>
  30 <a name="l00008"></a>00008 <span class="comment">    Copyright (C) 2008-2009, Nicolas VIVIEN</span>
  31 <a name="l00009"></a>00009 <span class="comment"></span>
  32 <a name="l00010"></a>00010 <span class="comment">    This program is free software; you can redistribute it and/or modify</span>
  33 <a name="l00011"></a>00011 <span class="comment">    it under the terms of the GNU General Public License as published by</span>
  34 <a name="l00012"></a>00012 <span class="comment">    the Free Software Foundation; either version 2 of the License, or</span>
  35 <a name="l00013"></a>00013 <span class="comment">    (at your option) any later version.</span>
  36 <a name="l00014"></a>00014 <span class="comment"></span>
  37 <a name="l00015"></a>00015 <span class="comment">    This program is distributed in the hope that it will be useful,</span>
  38 <a name="l00016"></a>00016 <span class="comment">    but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
  39 <a name="l00017"></a>00017 <span class="comment">    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.</span>
  40 <a name="l00018"></a>00018 <span class="comment"></span>
  41 <a name="l00019"></a>00019 <span class="comment">    See the GNU General Public License in the COPYING file at the</span>
  42 <a name="l00020"></a>00020 <span class="comment">    root directory of this project for more details.</span>
  43 <a name="l00021"></a>00021 <span class="comment">*/</span>
  44 <a name="l00022"></a>00022
  45 <a name="l00023"></a>00023 <span class="preprocessor">#include "<a class="code" href="bmp_8h.html" title="BMP conversion routines.">bmp.h</a>"</span>
  46 <a name="l00024"></a>00024 <span class="preprocessor">#include "<a class="code" href="bmp-internal_8h.html" title="BMP structures.">bmp-internal.h</a>"</span>
  47 <a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="error_8h.html" title="Common exception classes for the Barry library.">error.h</a>"</span>
  48 <a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="endian_8h.html" title="Endian conversion macros.">endian.h</a>"</span>
  49 <a name="l00027"></a>00027
  50 <a name="l00028"></a>00028 <span class="keyword">namespace </span>Barry {
  51 <a name="l00029"></a>00029
  52 <a name="l00030"></a>00030 <span class="comment">//</span>
  53 <a name="l00031"></a>00031 <span class="comment">// GetTotalBitmapSize</span>
  54 <a name="l00032"></a>00032 <span class="comment">//</span><span class="comment"></span>
  55 <a name="l00033"></a>00033 <span class="comment">/// Returns the total number of bytes needed to convert a</span>
  56 <a name="l00034"></a>00034 <span class="comment">/// screenshot of the given dimensions into a bitmap,</span>
  57 <a name="l00035"></a>00035 <span class="comment">/// using the ScreenshotToBitmap() function.</span>
  58 <a name="l00036"></a>00036 <span class="comment">///</span>
  59 <a name="l00037"></a><a class="code" href="namespaceBarry.html#e9d92a617771de40f7bb5a15b8da1807">00037</a> <span class="comment"></span>BXEXPORT <span class="keywordtype">size_t</span> <a class="code" href="namespaceBarry.html#e9d92a617771de40f7bb5a15b8da1807" title="Returns the total number of bytes needed to convert a screenshot of the given dimensions...">GetTotalBitmapSize</a>(<span class="keyword">const</span> JLScreenInfo &amp;info)
  60 <a name="l00038"></a>00038 {
  61 <a name="l00039"></a>00039         <span class="keywordflow">return</span> <span class="keyword">sizeof</span>(bmp_file_header_t) +
  62 <a name="l00040"></a>00040                 <span class="keyword">sizeof</span>(bmp_info_header_t) +
  63 <a name="l00041"></a>00041                 (info.width * info.height * 4); <span class="comment">// 4 byte RGB per pixel</span>
  64 <a name="l00042"></a>00042
  65 <a name="l00043"></a>00043 }
  66 <a name="l00044"></a>00044
  67 <a name="l00045"></a>00045 <span class="comment">//</span>
  68 <a name="l00046"></a>00046 <span class="comment">// ScreenshotToBitmap</span>
  69 <a name="l00047"></a>00047 <span class="comment">//</span><span class="comment"></span>
  70 <a name="l00048"></a>00048 <span class="comment">/// Converts screenshot data obtained via JavaLoader::GetScreenshot()</span>
  71 <a name="l00049"></a>00049 <span class="comment">/// into uncompressed bitmap format, suitable for writing BMP files.</span>
  72 <a name="l00050"></a>00050 <span class="comment">/// Arguments info and screenshot come from GetScreenshot() and the</span>
  73 <a name="l00051"></a>00051 <span class="comment">/// converted data is stored in bitmap.</span>
  74 <a name="l00052"></a>00052 <span class="comment">///</span>
  75 <a name="l00053"></a>00053 <span class="comment"></span><span class="comment">//</span>
  76 <a name="l00054"></a>00054 <span class="comment">// This function assumes that the btoh() converter functions match</span>
  77 <a name="l00055"></a>00055 <span class="comment">// the needs of the bitmap file format.  Namely: little endian.</span>
  78 <a name="l00056"></a>00056 <span class="comment">//</span>
  79 <a name="l00057"></a><a class="code" href="namespaceBarry.html#9da780aab46e04d16fddd855c85933ba">00057</a> BXEXPORT <span class="keywordtype">void</span> <a class="code" href="namespaceBarry.html#9da780aab46e04d16fddd855c85933ba" title="Converts screenshot data obtained via JavaLoader::GetScreenshot() into uncompressed...">ScreenshotToBitmap</a>(<span class="keyword">const</span> JLScreenInfo &amp;info,
  80 <a name="l00058"></a>00058                                  <span class="keyword">const</span> Data &amp;screenshot,
  81 <a name="l00059"></a>00059                                  Data &amp;bitmap)
  82 <a name="l00060"></a>00060 {
  83 <a name="l00061"></a>00061         <span class="comment">// Read screen info</span>
  84 <a name="l00062"></a>00062         <span class="keywordtype">size_t</span> width = info.width;
  85 <a name="l00063"></a>00063         <span class="keywordtype">size_t</span> height = info.height;
  86 <a name="l00064"></a>00064         <span class="keywordtype">size_t</span> total_bitmap_size = <a class="code" href="namespaceBarry.html#e9d92a617771de40f7bb5a15b8da1807" title="Returns the total number of bytes needed to convert a screenshot of the given dimensions...">GetTotalBitmapSize</a>(info);
  87 <a name="l00065"></a>00065
  88 <a name="l00066"></a>00066         <span class="comment">// make sure there is enough screeshot pixel data for the</span>
  89 <a name="l00067"></a>00067         <span class="comment">// given width and height</span>
  90 <a name="l00068"></a>00068         <span class="keywordflow">if</span>( screenshot.GetSize() &lt; (width * height * 2) ) <span class="comment">// 2 byte screenshot pixel data</span>
  91 <a name="l00069"></a>00069                 <span class="keywordflow">throw</span> <a class="code" href="classBarry_1_1Error.html" title="The base class for any future derived exceptions.">Error</a>(<span class="stringliteral">"Screenshot data size is too small for given width+height"</span>);
  92 <a name="l00070"></a>00070
  93 <a name="l00071"></a>00071
  94 <a name="l00072"></a>00072         <span class="comment">// setup write pointer</span>
  95 <a name="l00073"></a>00073         <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *write = bitmap.GetBuffer(total_bitmap_size);
  96 <a name="l00074"></a>00074
  97 <a name="l00075"></a>00075         <span class="comment">//</span>
  98 <a name="l00076"></a>00076         <span class="comment">// Build header BMP file</span>
  99 <a name="l00077"></a>00077         <span class="comment">//</span>
 100 <a name="l00078"></a>00078         bmp_file_header_t *fileheader = (bmp_file_header_t*) write;
 101 <a name="l00079"></a>00079         write += <span class="keyword">sizeof</span>(bmp_file_header_t);
 102 <a name="l00080"></a>00080
 103 <a name="l00081"></a>00081         <span class="comment">// BMP</span>
 104 <a name="l00082"></a>00082         fileheader-&gt;bfType[0] = <span class="charliteral">'B'</span>;
 105 <a name="l00083"></a>00083         fileheader-&gt;bfType[1] = <span class="charliteral">'M'</span>;
 106 <a name="l00084"></a>00084
 107 <a name="l00085"></a>00085         <span class="comment">// Size of file</span>
 108 <a name="l00086"></a>00086         fileheader-&gt;bfSize = btohl(total_bitmap_size);
 109 <a name="l00087"></a>00087
 110 <a name="l00088"></a>00088         <span class="comment">// Always 0x00</span>
 111 <a name="l00089"></a>00089         fileheader-&gt;bfReserved1 = 0;
 112 <a name="l00090"></a>00090         fileheader-&gt;bfReserved2 = 0;
 113 <a name="l00091"></a>00091
 114 <a name="l00092"></a>00092         <span class="comment">// Offset to find the data</span>
 115 <a name="l00093"></a>00093         fileheader-&gt;bfOffBits = btohl(<span class="keyword">sizeof</span>(bmp_file_header_t) + <span class="keyword">sizeof</span>(bmp_info_header_t));
 116 <a name="l00094"></a>00094
 117 <a name="l00095"></a>00095
 118 <a name="l00096"></a>00096         <span class="comment">//</span>
 119 <a name="l00097"></a>00097         <span class="comment">// Build info BMP file</span>
 120 <a name="l00098"></a>00098         <span class="comment">//</span>
 121 <a name="l00099"></a>00099         bmp_info_header_t *infoheader = (bmp_info_header_t*) write;
 122 <a name="l00100"></a>00100         write += <span class="keyword">sizeof</span>(bmp_info_header_t);
 123 <a name="l00101"></a>00101
 124 <a name="l00102"></a>00102         <span class="comment">// Size of info section</span>
 125 <a name="l00103"></a>00103         infoheader-&gt;biSize = btohl(<span class="keyword">sizeof</span>(bmp_info_header_t));
 126 <a name="l00104"></a>00104
 127 <a name="l00105"></a>00105         <span class="comment">// Width x Height</span>
 128 <a name="l00106"></a>00106         infoheader-&gt;biWidth = btohl(width);
 129 <a name="l00107"></a>00107         infoheader-&gt;biHeight = btohl(height);
 130 <a name="l00108"></a>00108
 131 <a name="l00109"></a>00109         <span class="comment">// Planes number</span>
 132 <a name="l00110"></a>00110         infoheader-&gt;biPlanes = btohs(0x01);
 133 <a name="l00111"></a>00111
 134 <a name="l00112"></a>00112         <span class="comment">// Bit count</span>
 135 <a name="l00113"></a>00113         infoheader-&gt;biBitCount = btohs(0x20);
 136 <a name="l00114"></a>00114
 137 <a name="l00115"></a>00115         <span class="comment">// Compression : No</span>
 138 <a name="l00116"></a>00116         infoheader-&gt;biCompression = 0;
 139 <a name="l00117"></a>00117
 140 <a name="l00118"></a>00118         <span class="comment">// Size of image</span>
 141 <a name="l00119"></a>00119         infoheader-&gt;biSizeImage = btohl(4 * width * height);
 142 <a name="l00120"></a>00120
 143 <a name="l00121"></a>00121         <span class="comment">// Pels Per Meter</span>
 144 <a name="l00122"></a>00122         infoheader-&gt;biXPelsPerMeter = 0;
 145 <a name="l00123"></a>00123         infoheader-&gt;biYPelsPerMeter = 0;
 146 <a name="l00124"></a>00124
 147 <a name="l00125"></a>00125         <span class="comment">// Color palette used : None</span>
 148 <a name="l00126"></a>00126         infoheader-&gt;biClrUsed = 0;
 149 <a name="l00127"></a>00127
 150 <a name="l00128"></a>00128         <span class="comment">// Color palette important : None</span>
 151 <a name="l00129"></a>00129         infoheader-&gt;biClrImportant = 0;
 152 <a name="l00130"></a>00130
 153 <a name="l00131"></a>00131
 154 <a name="l00132"></a>00132         <span class="comment">// I work with 2 bytes (see the pixel format)</span>
 155 <a name="l00133"></a>00133         <span class="keyword">const</span> uint16_t *data = (<span class="keyword">const</span> uint16_t*) screenshot.GetData();
 156 <a name="l00134"></a>00134         <span class="keywordtype">size_t</span> pixel_count = width * height;
 157 <a name="l00135"></a>00135
 158 <a name="l00136"></a>00136         <span class="comment">// For each pixel... (note BMP format is up and backwards, hence</span>
 159 <a name="l00137"></a>00137         <span class="comment">// offset calculation for each pixel in for loop)</span>
 160 <a name="l00138"></a>00138         <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j=0; j&lt;height; j++) {
 161 <a name="l00139"></a>00139                 <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i=0; i&lt;width; i++) {
 162 <a name="l00140"></a>00140                         <span class="comment">// Read one pixel in the picture</span>
 163 <a name="l00141"></a>00141                         <span class="keywordtype">short</span> value = data[(pixel_count - 1) - ((width-1 - i) + (width * j))];
 164 <a name="l00142"></a>00142
 165 <a name="l00143"></a>00143                         <span class="comment">// Pixel format used by the handheld is : 16 bits</span>
 166 <a name="l00144"></a>00144                         <span class="comment">// MSB &lt; .... .... .... .... &gt; LSB</span>
 167 <a name="l00145"></a>00145                         <span class="comment">//                    ^^^^^^ : Blue (between 0x00 and 0x1F)</span>
 168 <a name="l00146"></a>00146                         <span class="comment">//             ^^^^^^^ : Green (between 0x00 and 0x3F)</span>
 169 <a name="l00147"></a>00147                         <span class="comment">//       ^^^^^^ : Red (between 0x00 and 0x1F)</span>
 170 <a name="l00148"></a>00148
 171 <a name="l00149"></a>00149                         write[3] = 0x00;                                        <span class="comment">// alpha</span>
 172 <a name="l00150"></a>00150                         write[2] = (((value &gt;&gt; 11) &amp; 0x1F) * 0xFF) / 0x1F;      <span class="comment">// red</span>
 173 <a name="l00151"></a>00151                         write[1] = (((value &gt;&gt; 5) &amp; 0x3F) * 0xFF) / 0x3F;       <span class="comment">// green</span>
 174 <a name="l00152"></a>00152                         write[0] = ((value &amp; 0x1F) * 0xFF) / 0x1F;              <span class="comment">// blue</span>
 175 <a name="l00153"></a>00153
 176 <a name="l00154"></a>00154                         write += 4;
 177 <a name="l00155"></a>00155                 }
 178 <a name="l00156"></a>00156         }
 179 <a name="l00157"></a>00157
 180 <a name="l00158"></a>00158         bitmap.ReleaseBuffer(total_bitmap_size);
 181 <a name="l00159"></a>00159 }
 182 <a name="l00160"></a>00160
 183 <a name="l00161"></a>00161 } <span class="comment">// namespace Barry</span>
 184 <a name="l00162"></a>00162
 185 </pre></div></div>
 186 <hr size="1"><address style="text-align: right;"><small>Generated on Thu Feb 10 16:13:57 2011 for Barry by&nbsp;
 187 <a href="http://www.doxygen.org/index.html">
 188 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address>
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