<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<title>Barry: bmp.cc Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<link href="doxygen.css" rel="stylesheet" type="text/css"/>
</head>
<body>
<!-- Generated by Doxygen 1.6.2-20100208 -->
<div class="navigation" id="top">
<div class="tabs">
<ul>
<li><a href="index.html"><span>Main Page</span></a></li>
<li><a href="modules.html"><span>Modules</span></a></li>
<li><a href="namespaces.html"><span>Namespaces</span></a></li>
<li><a href="annotated.html"><span>Classes</span></a></li>
<li class="current"><a href="files.html"><span>Files</span></a></li>
<li><a href="dirs.html"><span>Directories</span></a></li>
</ul>
</div>
<div class="tabs">
<ul>
<li><a href="files.html"><span>File List</span></a></li>
</ul>
</div>
<div class="navpath"><a class="el" href="dir_65781e9408669bb8d7d9c025fdb5fe86.html">src</a>
</div>
</div>
<div class="contents">
<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>
<a name="l00002"></a>00002 <span class="comment"></span><span class="comment">/// \file bmp.cc</span>
<a name="l00003"></a>00003 <span class="comment"></span><span class="comment">/// BMP conversion routines</span>
<a name="l00004"></a>00004 <span class="comment"></span><span class="comment">///</span>
<a name="l00005"></a>00005 <span class="comment"></span>
<a name="l00006"></a>00006 <span class="comment">/*</span>
<a name="l00007"></a>00007 <span class="comment"> Copyright (C) 2009-2010, Net Direct Inc. (http://www.netdirect.ca/)</span>
<a name="l00008"></a>00008 <span class="comment"> Copyright (C) 2008-2009, Nicolas VIVIEN</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment"> This program is free software; you can redistribute it and/or modify</span>
<a name="l00011"></a>00011 <span class="comment"> it under the terms of the GNU General Public License as published by</span>
<a name="l00012"></a>00012 <span class="comment"> the Free Software Foundation; either version 2 of the License, or</span>
<a name="l00013"></a>00013 <span class="comment"> (at your option) any later version.</span>
<a name="l00014"></a>00014 <span class="comment"></span>
<a name="l00015"></a>00015 <span class="comment"> This program is distributed in the hope that it will be useful,</span>
<a name="l00016"></a>00016 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00017"></a>00017 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.</span>
<a name="l00018"></a>00018 <span class="comment"></span>
<a name="l00019"></a>00019 <span class="comment"> See the GNU General Public License in the COPYING file at the</span>
<a name="l00020"></a>00020 <span class="comment"> root directory of this project for more details.</span>
<a name="l00021"></a>00021 <span class="comment">*/</span>
<a name="l00022"></a>00022
<a name="l00023"></a>00023 <span class="preprocessor">#include "<a class="code" href="bmp_8h.html" title="BMP conversion routines.">bmp.h</a>"</span>
<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>
<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>
<a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="endian_8h.html" title="Endian conversion macros.">endian.h</a>"</span>
<a name="l00027"></a>00027
<a name="l00028"></a><a class="code" href="namespaceBarry.html">00028</a> <span class="keyword">namespace </span>Barry {
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="comment">//</span>
<a name="l00031"></a>00031 <span class="comment">// GetTotalBitmapSize</span>
<a name="l00032"></a>00032 <span class="comment">//</span><span class="comment"></span>
<a name="l00033"></a>00033 <span class="comment">/// Returns the total number of bytes needed to convert a</span>
<a name="l00034"></a>00034 <span class="comment">/// screenshot of the given dimensions into a bitmap,</span>
<a name="l00035"></a>00035 <span class="comment">/// using the ScreenshotToBitmap() function.</span>
<a name="l00036"></a>00036 <span class="comment">///</span>
<a name="l00037"></a>00037 <span class="comment"></span>BXEXPORT <span class="keywordtype">size_t</span> <a class="code" href="namespaceBarry.html#ae9d92a617771de40f7bb5a15b8da1807" title="Returns the total number of bytes needed to convert a screenshot of the given dimensions...">GetTotalBitmapSize</a>(<span class="keyword">const</span> <a class="code" href="classBarry_1_1JLScreenInfo.html">JLScreenInfo</a> &info)
<a name="l00038"></a>00038 {
<a name="l00039"></a>00039 <span class="keywordflow">return</span> <span class="keyword">sizeof</span>(<a class="code" href="structBXLOCAL.html">bmp_file_header_t</a>) +
<a name="l00040"></a>00040 <span class="keyword">sizeof</span>(<a class="code" href="structBXLOCAL.html">bmp_info_header_t</a>) +
<a name="l00041"></a>00041 (info.width * info.height * 4); <span class="comment">// 4 byte RGB per pixel</span>
<a name="l00042"></a>00042
<a name="l00043"></a>00043 }
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="comment">//</span>
<a name="l00046"></a>00046 <span class="comment">// ScreenshotToBitmap</span>
<a name="l00047"></a>00047 <span class="comment">//</span><span class="comment"></span>
<a name="l00048"></a>00048 <span class="comment">/// Converts screenshot data obtained via JavaLoader::GetScreenshot()</span>
<a name="l00049"></a>00049 <span class="comment">/// into uncompressed bitmap format, suitable for writing BMP files.</span>
<a name="l00050"></a>00050 <span class="comment">/// Arguments info and screenshot come from GetScreenshot() and the</span>
<a name="l00051"></a>00051 <span class="comment">/// converted data is stored in bitmap.</span>
<a name="l00052"></a>00052 <span class="comment">///</span>
<a name="l00053"></a>00053 <span class="comment"></span><span class="comment">//</span>
<a name="l00054"></a>00054 <span class="comment">// This function assumes that the btoh() converter functions match</span>
<a name="l00055"></a>00055 <span class="comment">// the needs of the bitmap file format. Namely: little endian.</span>
<a name="l00056"></a>00056 <span class="comment">//</span>
<a name="l00057"></a>00057 BXEXPORT <span class="keywordtype">void</span> <a class="code" href="namespaceBarry.html#a9da780aab46e04d16fddd855c85933ba" title="Converts screenshot data obtained via JavaLoader::GetScreenshot() into uncompressed...">ScreenshotToBitmap</a>(<span class="keyword">const</span> <a class="code" href="classBarry_1_1JLScreenInfo.html">JLScreenInfo</a> &info,
<a name="l00058"></a>00058 <span class="keyword">const</span> <a class="code" href="classBarry_1_1Data.html">Data</a> &screenshot,
<a name="l00059"></a>00059 <a class="code" href="classBarry_1_1Data.html">Data</a> &bitmap)
<a name="l00060"></a>00060 {
<a name="l00061"></a>00061 <span class="comment">// Read screen info</span>
<a name="l00062"></a>00062 <span class="keywordtype">size_t</span> width = info.width;
<a name="l00063"></a>00063 <span class="keywordtype">size_t</span> height = info.height;
<a name="l00064"></a>00064 <span class="keywordtype">size_t</span> total_bitmap_size = <a class="code" href="namespaceBarry.html#ae9d92a617771de40f7bb5a15b8da1807" title="Returns the total number of bytes needed to convert a screenshot of the given dimensions...">GetTotalBitmapSize</a>(info);
<a name="l00065"></a>00065
<a name="l00066"></a>00066 <span class="comment">// make sure there is enough screeshot pixel data for the</span>
<a name="l00067"></a>00067 <span class="comment">// given width and height</span>
<a name="l00068"></a>00068 <span class="keywordflow">if</span>( screenshot.GetSize() < (width * height * 2) ) <span class="comment">// 2 byte screenshot pixel data</span>
<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>);
<a name="l00070"></a>00070
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="comment">// setup write pointer</span>
<a name="l00073"></a>00073 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *write = bitmap.GetBuffer(total_bitmap_size);
<a name="l00074"></a>00074
<a name="l00075"></a>00075 <span class="comment">//</span>
<a name="l00076"></a>00076 <span class="comment">// Build header BMP file</span>
<a name="l00077"></a>00077 <span class="comment">//</span>
<a name="l00078"></a>00078 <a class="code" href="structBXLOCAL.html">bmp_file_header_t</a> *fileheader = (<a class="code" href="structBXLOCAL.html">bmp_file_header_t</a>*) write;
<a name="l00079"></a>00079 write += <span class="keyword">sizeof</span>(<a class="code" href="structBXLOCAL.html">bmp_file_header_t</a>);
<a name="l00080"></a>00080
<a name="l00081"></a>00081 <span class="comment">// BMP</span>
<a name="l00082"></a>00082 fileheader->bfType[0] = <span class="charliteral">'B'</span>;
<a name="l00083"></a>00083 fileheader->bfType[1] = <span class="charliteral">'M'</span>;
<a name="l00084"></a>00084
<a name="l00085"></a>00085 <span class="comment">// Size of file</span>
<a name="l00086"></a>00086 fileheader->bfSize = btohl(total_bitmap_size);
<a name="l00087"></a>00087
<a name="l00088"></a>00088 <span class="comment">// Always 0x00</span>
<a name="l00089"></a>00089 fileheader->bfReserved1 = 0;
<a name="l00090"></a>00090 fileheader->bfReserved2 = 0;
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <span class="comment">// Offset to find the data</span>
<a name="l00093"></a>00093 fileheader->bfOffBits = btohl(<span class="keyword">sizeof</span>(<a class="code" href="structBXLOCAL.html">bmp_file_header_t</a>) + <span class="keyword">sizeof</span>(<a class="code" href="structBXLOCAL.html">bmp_info_header_t</a>));
<a name="l00094"></a>00094
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <span class="comment">//</span>
<a name="l00097"></a>00097 <span class="comment">// Build info BMP file</span>
<a name="l00098"></a>00098 <span class="comment">//</span>
<a name="l00099"></a>00099 <a class="code" href="structBXLOCAL.html">bmp_info_header_t</a> *infoheader = (<a class="code" href="structBXLOCAL.html">bmp_info_header_t</a>*) write;
<a name="l00100"></a>00100 write += <span class="keyword">sizeof</span>(<a class="code" href="structBXLOCAL.html">bmp_info_header_t</a>);
<a name="l00101"></a>00101
<a name="l00102"></a>00102 <span class="comment">// Size of info section</span>
<a name="l00103"></a>00103 infoheader->biSize = btohl(<span class="keyword">sizeof</span>(<a class="code" href="structBXLOCAL.html">bmp_info_header_t</a>));
<a name="l00104"></a>00104
<a name="l00105"></a>00105 <span class="comment">// Width x Height</span>
<a name="l00106"></a>00106 infoheader->biWidth = btohl(width);
<a name="l00107"></a>00107 infoheader->biHeight = btohl(height);
<a name="l00108"></a>00108
<a name="l00109"></a>00109 <span class="comment">// Planes number</span>
<a name="l00110"></a>00110 infoheader->biPlanes = btohs(0x01);
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="comment">// Bit count</span>
<a name="l00113"></a>00113 infoheader->biBitCount = btohs(0x20);
<a name="l00114"></a>00114
<a name="l00115"></a>00115 <span class="comment">// Compression : No</span>
<a name="l00116"></a>00116 infoheader->biCompression = 0;
<a name="l00117"></a>00117
<a name="l00118"></a>00118 <span class="comment">// Size of image</span>
<a name="l00119"></a>00119 infoheader->biSizeImage = btohl(4 * width * height);
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <span class="comment">// Pels Per Meter</span>
<a name="l00122"></a>00122 infoheader->biXPelsPerMeter = 0;
<a name="l00123"></a>00123 infoheader->biYPelsPerMeter = 0;
<a name="l00124"></a>00124
<a name="l00125"></a>00125 <span class="comment">// Color palette used : None</span>
<a name="l00126"></a>00126 infoheader->biClrUsed = 0;
<a name="l00127"></a>00127
<a name="l00128"></a>00128 <span class="comment">// Color palette important : None</span>
<a name="l00129"></a>00129 infoheader->biClrImportant = 0;
<a name="l00130"></a>00130
<a name="l00131"></a>00131
<a name="l00132"></a>00132 <span class="comment">// I work with 2 bytes (see the pixel format)</span>
<a name="l00133"></a>00133 <span class="keyword">const</span> uint16_t *data = (<span class="keyword">const</span> uint16_t*) screenshot.GetData();
<a name="l00134"></a>00134 <span class="keywordtype">size_t</span> pixel_count = width * height;
<a name="l00135"></a>00135
<a name="l00136"></a>00136 <span class="comment">// For each pixel... (note BMP format is up and backwards, hence</span>
<a name="l00137"></a>00137 <span class="comment">// offset calculation for each pixel in for loop)</span>
<a name="l00138"></a>00138 <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j=0; j<height; j++) {
<a name="l00139"></a>00139 <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i=0; i<width; i++) {
<a name="l00140"></a>00140 <span class="comment">// Read one pixel in the picture</span>
<a name="l00141"></a>00141 <span class="keywordtype">short</span> value = data[(pixel_count - 1) - ((width-1 - i) + (width * j))];
<a name="l00142"></a>00142
<a name="l00143"></a>00143 <span class="comment">// Pixel format used by the handheld is : 16 bits</span>
<a name="l00144"></a>00144 <span class="comment">// MSB < .... .... .... .... > LSB</span>
<a name="l00145"></a>00145 <span class="comment">// ^^^^^^ : Blue (between 0x00 and 0x1F)</span>
<a name="l00146"></a>00146 <span class="comment">// ^^^^^^^ : Green (between 0x00 and 0x3F)</span>
<a name="l00147"></a>00147 <span class="comment">// ^^^^^^ : Red (between 0x00 and 0x1F)</span>
<a name="l00148"></a>00148
<a name="l00149"></a>00149 write[3] = 0x00; <span class="comment">// alpha</span>
<a name="l00150"></a>00150 write[2] = (((value >> 11) & 0x1F) * 0xFF) / 0x1F; <span class="comment">// red</span>
<a name="l00151"></a>00151 write[1] = (((value >> 5) & 0x3F) * 0xFF) / 0x3F; <span class="comment">// green</span>
<a name="l00152"></a>00152 write[0] = ((value & 0x1F) * 0xFF) / 0x1F; <span class="comment">// blue</span>
<a name="l00153"></a>00153
<a name="l00154"></a>00154 write += 4;
<a name="l00155"></a>00155 }
<a name="l00156"></a>00156 }
<a name="l00157"></a>00157
<a name="l00158"></a>00158 bitmap.ReleaseBuffer(total_bitmap_size);
<a name="l00159"></a>00159 }
<a name="l00160"></a>00160
<a name="l00161"></a>00161 } <span class="comment">// namespace Barry</span>
<a name="l00162"></a>00162
</pre></div></div>
<hr class="footer"/><address style="text-align: right;"><small>Generated by
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2-20100208 </small></address>
</body>
</html>
