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<div class="title">src/libUnuk/ImageLoader.cpp</div> </div>
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<a href="_image_loader_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#include <cstdio></span>
<a name="l00002"></a>00002 <span class="preprocessor">#include <cstring></span>
<a name="l00003"></a>00003 <span class="preprocessor">#include <errno.h></span>
<a name="l00004"></a>00004 <span class="preprocessor">#include "<a class="code" href="_image_loader_8h.html">ImageLoader.h</a>"</span>
<a name="l00005"></a>00005 <span class="preprocessor">#include "<a class="code" href="_debug_8h.html">Debug.h</a>"</span>
<a name="l00006"></a><a class="code" href="_image_loader_8cpp.html#a645997b03c18d647bf8e3c4fe29b19ba">00006</a> <span class="preprocessor">#define BITMAP_TYPE 19778</span>
<a name="l00007"></a>00007 <span class="preprocessor"></span>
<a name="l00008"></a>00008 <span class="comment">// Initialize an empty image.</span>
<a name="l00009"></a><a class="code" href="class_image_loader.html#aff8e0ecf1611ba1c2d9f1fbf6f4efb38">00009</a> <a class="code" href="class_image_loader.html#aff8e0ecf1611ba1c2d9f1fbf6f4efb38">ImageLoader::ImageLoader</a>(<span class="keywordtype">void</span>) {
<a name="l00010"></a>00010 Reset();
<a name="l00011"></a>00011 }
<a name="l00012"></a>00012
<a name="l00013"></a>00013 <span class="comment">// Initializes an image with an image from the disk.</span>
<a name="l00014"></a><a class="code" href="class_image_loader.html#aa68025bde21fa6566ad43d04b61fa211">00014</a> <a class="code" href="class_image_loader.html#aff8e0ecf1611ba1c2d9f1fbf6f4efb38">ImageLoader::ImageLoader</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *filename) {
<a name="l00015"></a>00015 Reset();
<a name="l00016"></a>00016 <a class="code" href="class_image_loader.html#a24fdb991574efb5d45afc1aae608f9d0">LoadBMP</a>(filename);
<a name="l00017"></a>00017 }
<a name="l00018"></a>00018
<a name="l00019"></a><a class="code" href="class_image_loader.html#acce398271fc04e6a5ab9707d9210cb3e">00019</a> <a class="code" href="class_image_loader.html#acce398271fc04e6a5ab9707d9210cb3e">ImageLoader::~ImageLoader</a>(<span class="keywordtype">void</span>) {
<a name="l00020"></a>00020 <span class="keywordflow">if</span>(colors != <a class="code" href="_node_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {
<a name="l00021"></a>00021 <span class="keyword">delete</span> [] colors;
<a name="l00022"></a>00022 }
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="keywordflow">if</span>(pixelData != <a class="code" href="_node_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {
<a name="l00025"></a>00025 <span class="keyword">delete</span> [] pixelData;
<a name="l00026"></a>00026 }
<a name="l00027"></a>00027 }
<a name="l00028"></a>00028
<a name="l00029"></a><a class="code" href="class_image_loader.html#a24fdb991574efb5d45afc1aae608f9d0">00029</a> <span class="keywordtype">bool</span> <a class="code" href="class_image_loader.html#a24fdb991574efb5d45afc1aae608f9d0">ImageLoader::LoadBMP</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* filename) {
<a name="l00030"></a>00030 FILE *in = <a class="code" href="_node_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00031"></a>00031 <span class="keywordtype">bool</span> result = <span class="keyword">false</span>;
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="comment">// Open the file for reading in binary mode.</span>
<a name="l00034"></a>00034 in = fopen(filename, <span class="stringliteral">"rb"</span>);
<a name="l00035"></a>00035 <span class="keywordflow">if</span>(in == <a class="code" href="_node_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {
<a name="l00036"></a>00036 perror(<span class="stringliteral">"Error"</span>);
<a name="l00037"></a>00037 <a class="code" href="class_debug.html#ace75e2aa3105e64f9fc82c537b45135d">Debug::logger</a>-><a class="code" href="class_debug.html#a7f171818a11f4d6b8dee3b44c4d6f0a7">message</a>(<span class="stringliteral">"\nError Number: %d"</span>, errno);
<a name="l00038"></a>00038 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00039"></a>00039 }
<a name="l00040"></a>00040
<a name="l00041"></a>00041 fread(&bmfh, <span class="keyword">sizeof</span>(<a class="code" href="_image_loader_8h.html#acadbbb4e8926d8a036801178bca44e72">BITMAPFILEHEADER</a>), 1, in);
<a name="l00042"></a>00042
<a name="l00043"></a>00043 <span class="comment">// Check if this is even the right type of file.</span>
<a name="l00044"></a>00044 <span class="keywordflow">if</span>(bmfh.bfType != <a class="code" href="_image_loader_8cpp.html#a645997b03c18d647bf8e3c4fe29b19ba">BITMAP_TYPE</a>) {
<a name="l00045"></a>00045 perror(<span class="stringliteral">"Error"</span>);
<a name="l00046"></a>00046 <a class="code" href="class_debug.html#ace75e2aa3105e64f9fc82c537b45135d">Debug::logger</a>-><a class="code" href="class_debug.html#a7f171818a11f4d6b8dee3b44c4d6f0a7">message</a>(<span class="stringliteral">"\nError Number: %d"</span>, errno);
<a name="l00047"></a>00047 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00048"></a>00048 }
<a name="l00049"></a>00049
<a name="l00050"></a>00050 fread(&bmih, <span class="keyword">sizeof</span>(<a class="code" href="_image_loader_8h.html#a972105880bedaaf893cd19754f3f6758">BITMAPINFOHEADER</a>), 1, in);
<a name="l00051"></a>00051 <a class="code" href="wglext_8h.html#ae6531b1788ca42a9ae8155b0c52e7630">width</a> = bmih.biWidth;
<a name="l00052"></a>00052 <a class="code" href="wglext_8h.html#ab2e63df950c3789599e1e43f477bc9e3">height</a> = bmih.biHeight;
<a name="l00053"></a>00053 bpp = bmih.biBitCount;
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="comment">// TODO: Get this running on 24-bit images too, right now it will seg fault if it is 24-bit.</span>
<a name="l00056"></a>00056 <span class="comment">// Set the number of colors.</span>
<a name="l00057"></a>00057 <a class="code" href="_image_loader_8h.html#a9154c0d0c21af4686624543215b4e5f2">LONG</a> numColors = 1 << bmih.biBitCount;
<a name="l00058"></a>00058
<a name="l00059"></a>00059 <span class="comment">// The bitmap is not yet loaded.</span>
<a name="l00060"></a>00060 loaded = <span class="keyword">false</span>;
<a name="l00061"></a>00061 <span class="comment">// Make sure memory is not lost.</span>
<a name="l00062"></a>00062 <span class="keywordflow">if</span>(colors != <a class="code" href="_node_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {
<a name="l00063"></a>00063 <span class="keyword">delete</span> [] colors;
<a name="l00064"></a>00064 }
<a name="l00065"></a>00065
<a name="l00066"></a>00066 <span class="keywordflow">if</span>(pixelData != <a class="code" href="_node_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {
<a name="l00067"></a>00067 <span class="keyword">delete</span> [] pixelData;
<a name="l00068"></a>00068 }
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="comment">// Load the palette for 8 bits per pixel.</span>
<a name="l00071"></a>00071 <span class="keywordflow">if</span>(bmih.biBitCount < 24) {
<a name="l00072"></a>00072 colors = <span class="keyword">new</span> <a class="code" href="_image_loader_8h.html#ae6f8a4686bbcb20bd72057e00143b167">RGBQUAD</a>[numColors];
<a name="l00073"></a>00073 fread(colors, <span class="keyword">sizeof</span>(<a class="code" href="_image_loader_8h.html#ae6f8a4686bbcb20bd72057e00143b167">RGBQUAD</a>), numColors, in);
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075
<a name="l00076"></a>00076 <a class="code" href="_image_loader_8h.html#a798af1e30bc65f319c1a246cecf59e39">DWORD</a> size = bmfh.bfSize - bmfh.bfOffBits;
<a name="l00077"></a>00077
<a name="l00078"></a>00078 <a class="code" href="_image_loader_8h.html#a4ae1dab0fb4b072a66584546209e7d58">BYTE</a> *tempPixelData = <a class="code" href="_node_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00079"></a>00079 tempPixelData = <span class="keyword">new</span> <a class="code" href="_image_loader_8h.html#a4ae1dab0fb4b072a66584546209e7d58">BYTE</a>[size];
<a name="l00080"></a>00080
<a name="l00081"></a>00081 <span class="keywordflow">if</span>(tempPixelData == <a class="code" href="_node_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {
<a name="l00082"></a>00082 <a class="code" href="class_debug.html#ace75e2aa3105e64f9fc82c537b45135d">Debug::logger</a>-><a class="code" href="class_debug.html#a7f171818a11f4d6b8dee3b44c4d6f0a7">message</a>(<span class="stringliteral">"\nError: Out of memory. Cannot find space to load image into memory."</span>);
<a name="l00083"></a>00083 fclose(in);
<a name="l00084"></a>00084 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00085"></a>00085 }
<a name="l00086"></a>00086
<a name="l00087"></a>00087 fread(tempPixelData, <span class="keyword">sizeof</span>(<a class="code" href="_image_loader_8h.html#a4ae1dab0fb4b072a66584546209e7d58">BYTE</a>), size, in);
<a name="l00088"></a>00088
<a name="l00089"></a>00089 result = FixPadding(tempPixelData, size);
<a name="l00090"></a>00090 loaded = result;
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <span class="keyword">delete</span> [] tempPixelData;
<a name="l00093"></a>00093 fclose(in);
<a name="l00094"></a>00094
<a name="l00095"></a>00095 <span class="keywordflow">return</span> result;
<a name="l00096"></a>00096 }
<a name="l00097"></a>00097
<a name="l00098"></a>00098 <span class="keywordtype">bool</span> ImageLoader::FixPadding(<a class="code" href="_image_loader_8h.html#a4ae1dab0fb4b072a66584546209e7d58">BYTE</a> <span class="keyword">const</span> * <span class="keyword">const</span> tempPixelData, <a class="code" href="_image_loader_8h.html#a798af1e30bc65f319c1a246cecf59e39">DWORD</a> size) {
<a name="l00099"></a>00099 <span class="comment">// byteWidth is the width of the actual image in bytes. padWidth is</span>
<a name="l00100"></a>00100 <span class="comment">// the width of the image plus the extrapadding.</span>
<a name="l00101"></a>00101 <a class="code" href="_image_loader_8h.html#a9154c0d0c21af4686624543215b4e5f2">LONG</a> byteWidth, padWidth;
<a name="l00102"></a>00102
<a name="l00103"></a>00103 <span class="comment">// Set both to the width of the image.</span>
<a name="l00104"></a>00104 byteWidth = padWidth = (<a class="code" href="_image_loader_8h.html#a9154c0d0c21af4686624543215b4e5f2">LONG</a>)((<span class="keywordtype">float</span>)<a class="code" href="wglext_8h.html#ae6531b1788ca42a9ae8155b0c52e7630">width</a> * (float)bpp / 8.0);
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="comment">// Add any extra space to bring each line to a DWORD boundary.</span>
<a name="l00107"></a>00107 <span class="keywordtype">short</span> padding = padWidth % 4 != 0;
<a name="l00108"></a>00108 padWidth += padding;
<a name="l00109"></a>00109
<a name="l00110"></a>00110 <a class="code" href="_image_loader_8h.html#a798af1e30bc65f319c1a246cecf59e39">DWORD</a> diff;
<a name="l00111"></a>00111 <span class="keywordtype">int</span> offset;
<a name="l00112"></a>00112
<a name="l00113"></a>00113 <a class="code" href="wglext_8h.html#ab2e63df950c3789599e1e43f477bc9e3">height</a> = bmih.biHeight;
<a name="l00114"></a>00114 <span class="comment">// Set the diff to the actual image size (without any padding).</span>
<a name="l00115"></a>00115 diff = <a class="code" href="wglext_8h.html#ab2e63df950c3789599e1e43f477bc9e3">height</a> * byteWidth;
<a name="l00116"></a>00116 <span class="comment">// allocate memory for the image.</span>
<a name="l00117"></a>00117 pixelData = <span class="keyword">new</span> <a class="code" href="_image_loader_8h.html#a4ae1dab0fb4b072a66584546209e7d58">BYTE</a>[diff];
<a name="l00118"></a>00118
<a name="l00119"></a>00119 <span class="keywordflow">if</span>(pixelData == <a class="code" href="_node_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {
<a name="l00120"></a>00120 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00121"></a>00121 }
<a name="l00122"></a>00122
<a name="l00123"></a>00123 <span class="comment">// ===================================================================</span>
<a name="l00124"></a>00124 <span class="comment">// Bitmap is inverted, so the paddind needs to be removed and the</span>
<a name="l00125"></a>00125 <span class="comment">// image reversed. Here you can start from the back of the file or</span>
<a name="l00126"></a>00126 <span class="comment">// the front, after the header. The only problem is that some programs</span>
<a name="l00127"></a>00127 <span class="comment">// will pad not only the data, but also the file size to be divisiaible</span>
<a name="l00128"></a>00128 <span class="comment">// by 4 bytes.</span>
<a name="l00129"></a>00129 <span class="comment">// ===================================================================</span>
<a name="l00130"></a>00130 <span class="keywordflow">if</span>(<a class="code" href="wglext_8h.html#ab2e63df950c3789599e1e43f477bc9e3">height</a> > 0) {
<a name="l00131"></a>00131 offset = padWidth - byteWidth;
<a name="l00132"></a>00132 <span class="keywordflow">for</span>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i = 0; i < size - 2; i += 4) {
<a name="l00133"></a>00133 <span class="keywordflow">if</span>((i + 1) % padWidth == 0) {
<a name="l00134"></a>00134 i += offset;
<a name="l00135"></a>00135 }
<a name="l00136"></a>00136 <span class="comment">// Now we need to swap the data for it to have the right order.</span>
<a name="l00137"></a>00137 *(pixelData + i) = *(tempPixelData + i + 2); <span class="comment">// R</span>
<a name="l00138"></a>00138 *(pixelData + i + 1) = *(tempPixelData + i + 1); <span class="comment">// G</span>
<a name="l00139"></a>00139 *(pixelData + i + 2) = *(tempPixelData + i); <span class="comment">// B</span>
<a name="l00140"></a>00140 *(pixelData + i + 3) = *(tempPixelData + i + 3); <span class="comment">// A</span>
<a name="l00141"></a>00141 }
<a name="l00142"></a>00142 } <span class="keywordflow">else</span> {
<a name="l00143"></a>00143 <span class="comment">// The image is not reserved. Only the padding needs to be removed.</span>
<a name="l00144"></a>00144 <a class="code" href="wglext_8h.html#ab2e63df950c3789599e1e43f477bc9e3">height</a> = <a class="code" href="wglext_8h.html#ab2e63df950c3789599e1e43f477bc9e3">height</a> * -1;
<a name="l00145"></a>00145 offset = 0;
<a name="l00146"></a>00146 <span class="keywordflow">while</span>(offset < <a class="code" href="wglext_8h.html#ab2e63df950c3789599e1e43f477bc9e3">height</a>) {
<a name="l00147"></a>00147 memcpy((pixelData + (offset * byteWidth)), (tempPixelData + (offset * padWidth)), byteWidth);
<a name="l00148"></a>00148 offset++;
<a name="l00149"></a>00149 }
<a name="l00150"></a>00150 }
<a name="l00151"></a>00151 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153
<a name="l00154"></a>00154 <span class="keywordtype">void</span> ImageLoader::Reset(<span class="keywordtype">void</span>) {
<a name="l00155"></a>00155 <a class="code" href="wglext_8h.html#ae6531b1788ca42a9ae8155b0c52e7630">width</a> = 0;
<a name="l00156"></a>00156 <a class="code" href="wglext_8h.html#ab2e63df950c3789599e1e43f477bc9e3">height</a> = 0;
<a name="l00157"></a>00157 pixelData = <a class="code" href="_node_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00158"></a>00158 colors = <a class="code" href="_node_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00159"></a>00159 loaded = <span class="keyword">false</span>;
<a name="l00160"></a>00160 }
<a name="l00161"></a>00161
<a name="l00162"></a>00162 <span class="comment">// Get the alpha channel as an array of bytes.</span>
<a name="l00163"></a>00163 <span class="comment">// The size of the array will return -1 on failure.</span>
<a name="l00164"></a><a class="code" href="class_image_loader.html#a216f7a6ba0bd49a673de772e0e6dca29">00164</a> <a class="code" href="_image_loader_8h.html#a4ae1dab0fb4b072a66584546209e7d58">BYTE</a> *<a class="code" href="class_image_loader.html#a216f7a6ba0bd49a673de772e0e6dca29">ImageLoader::GetAlpha</a>()<span class="keyword"> const </span>{
<a name="l00165"></a>00165 <a class="code" href="_image_loader_8h.html#a9154c0d0c21af4686624543215b4e5f2">LONG</a> arraySize = <a class="code" href="wglext_8h.html#ae6531b1788ca42a9ae8155b0c52e7630">width</a> * <a class="code" href="wglext_8h.html#ab2e63df950c3789599e1e43f477bc9e3">height</a>;
<a name="l00166"></a>00166 <a class="code" href="_image_loader_8h.html#a4ae1dab0fb4b072a66584546209e7d58">BYTE</a> *array = <span class="keyword">new</span> <a class="code" href="_image_loader_8h.html#a4ae1dab0fb4b072a66584546209e7d58">BYTE</a>[arraySize];
<a name="l00167"></a>00167
<a name="l00168"></a>00168 <span class="keywordflow">if</span>(array == <a class="code" href="_node_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {
<a name="l00169"></a>00169 <span class="keyword">delete</span> [] array;
<a name="l00170"></a>00170 <span class="keywordflow">return</span> <a class="code" href="_node_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00171"></a>00171 }
<a name="l00172"></a>00172
<a name="l00173"></a>00173 <span class="keywordflow">for</span>(<span class="keywordtype">long</span> i = 0; i < arraySize; i++) {
<a name="l00174"></a>00174 <span class="comment">// Jump to the alpha and extract it everytime.</span>
<a name="l00175"></a>00175 array[i] = pixelData[i * 4 + 3];
<a name="l00176"></a>00176 }
<a name="l00177"></a>00177 <span class="keywordflow">return</span> array;
<a name="l00178"></a>00178 }
</pre></div></div>
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