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<div class="title">PngImage.cpp</div>  </div>
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<div class="contents">
<a href="_png_image_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*  Project nGenEx</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">        Destroyer Studios LLC</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">        Copyright © 1997-2004. All Rights Reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">        SUBSYSTEM:    nGenEx.lib</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">        FILE:         PngImage.cpp</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">        AUTHOR:       John DiCamillo</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment">        OVERVIEW</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment">        ========</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment">        BMP image file loader</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment">*/</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;</div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;</div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="_mem_debug_8h.html">MemDebug.h</a>&quot;</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="_png_image_8h.html">PngImage.h</a>&quot;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;</div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="preprocessor">#include &lt;stdio.h&gt;</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment">// Needed for compatibility with libpng 1.4++</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"><a class="code" href="_png_image_8cpp.html#acad208b3e5753b679e6ef8d761d53d9f">   24</a></span>&#160;<span class="preprocessor">#define png_infopp_NULL (png_infopp)NULL</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"><a class="code" href="_png_image_8cpp.html#a4fd4a14c32e2bbab39b1deac1ccd28ec">   25</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define png_voidp_NULL (png_voidp)NULL</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"><a class="code" href="_png_image_8cpp.html#a82a90dbcb3c65be802dccb31f909bd02">   26</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define int_p_NULL (int*)NULL</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="preprocessor">#include &quot;png.h&quot;</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment">// +--------------------------------------------------------------------+</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;</div>
<div class="line"><a name="l00032"></a><span class="lineno"><a class="code" href="struct_png_image.html#ae3f602ac30a4e1909bb1b9fd7619c699">   32</a></span>&#160;<a class="code" href="struct_png_image.html#ae3f602ac30a4e1909bb1b9fd7619c699">PngImage::PngImage</a>()</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;: width(0), height(0), bpp(0), alpha_loaded(false), image(0)</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;{ }</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;</div>
<div class="line"><a name="l00036"></a><span class="lineno"><a class="code" href="struct_png_image.html#ad2a2196589ecd9b5b8b748b8272707c6">   36</a></span>&#160;<a class="code" href="struct_png_image.html#ad2a2196589ecd9b5b8b748b8272707c6">PngImage::~PngImage</a>()</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;{</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;        <span class="keyword">delete</span> [] <a class="code" href="struct_png_image.html#a82bdc04b944ce9904da0412cc4dc1e95">image</a>;</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;}</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment">// +--------------------------------------------------------------------+</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;</div>
<div class="line"><a name="l00043"></a><span class="lineno"><a class="code" href="struct_png_image.html#a0d2d083dfb611fdb1fdb056511bf415f">   43</a></span>&#160;<span class="keywordtype">int</span> <a class="code" href="struct_png_image.html#a0d2d083dfb611fdb1fdb056511bf415f">PngImage::Load</a>(<span class="keywordtype">char</span> *filename)</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;{</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;        <span class="keywordtype">int</span>   status = <a class="code" href="_png_image_8h.html#af9bdc3014f3d54c426b6d2df10de4960ad9f4cfad551953f9023df788acc5f637">PNG_INVALID</a>;</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;        FILE* f;</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;        fopen_s(&amp;f, filename,<span class="stringliteral">&quot;rb&quot;</span>);</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;        <span class="keywordflow">if</span> (f == NULL)</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;        <span class="keywordflow">return</span> <a class="code" href="_png_image_8h.html#af9bdc3014f3d54c426b6d2df10de4960a28ce36360f8107c765133608e0ea627e">PNG_NOFILE</a>;</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;        BYTE buf[12];</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;        fread(buf, 8, 1, f);</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;        fseek(f, 0, SEEK_SET);</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;        <span class="keywordflow">if</span> (png_sig_cmp(buf, (png_size_t)0, 8))</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;        <span class="keywordflow">return</span> <a class="code" href="_png_image_8h.html#af9bdc3014f3d54c426b6d2df10de4960ad9f4cfad551953f9023df788acc5f637">PNG_INVALID</a>;</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;        png_structp png_ptr;</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;        png_infop   info_ptr;</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;        <span class="comment">/* Create and initialize the png_struct with the desired error handler</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment">        * functions.  If you want to use the default stderr and longjump method,</span></div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment">        * you can supply NULL for the last three parameters.  We also supply the</span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment">        * the compiler header file version, so that we know if the application</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="comment">        * was compiled with a compatible version of the library.  REQUIRED</span></div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="comment">        */</span></div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;        png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;        <span class="keywordflow">if</span> (!png_ptr) {</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;                <span class="keywordflow">return</span> <a class="code" href="_png_image_8h.html#af9bdc3014f3d54c426b6d2df10de4960a38ac1640a270d3de4edb0d4c552d2b83">PNG_NOMEM</a>;</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;        }</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;        <span class="comment">/* Allocate/initialize the memory for image information.  REQUIRED. */</span></div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;        info_ptr = png_create_info_struct(png_ptr);</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;        <span class="keywordflow">if</span> (!info_ptr) {</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;                png_destroy_read_struct(&amp;png_ptr, <a class="code" href="_png_image_8cpp.html#acad208b3e5753b679e6ef8d761d53d9f">png_infopp_NULL</a>, <a class="code" href="_png_image_8cpp.html#acad208b3e5753b679e6ef8d761d53d9f">png_infopp_NULL</a>);</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;                <span class="keywordflow">return</span> <a class="code" href="_png_image_8h.html#af9bdc3014f3d54c426b6d2df10de4960a38ac1640a270d3de4edb0d4c552d2b83">PNG_NOMEM</a>;</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;        }</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        png_init_io(png_ptr, f);</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;        png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, <a class="code" href="_png_image_8cpp.html#a4fd4a14c32e2bbab39b1deac1ccd28ec">png_voidp_NULL</a>);</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;        status = <a class="code" href="struct_png_image.html#ae7af2b78e9d7afbb021310a4ee6a8b0a">CreateImage</a>(png_ptr, info_ptr);</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;        png_destroy_read_struct(&amp;png_ptr, &amp;info_ptr, <a class="code" href="_png_image_8cpp.html#acad208b3e5753b679e6ef8d761d53d9f">png_infopp_NULL</a>);</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;        fclose(f);</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;        <span class="keywordflow">return</span> status;</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;}</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="comment">// +--------------------------------------------------------------------+</span></div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;</div>
<div class="line"><a name="l00094"></a><span class="lineno"><a class="code" href="struct_png_i_o_struct.html">   94</a></span>&#160;<span class="keyword">struct </span><a class="code" href="struct_png_i_o_struct.html">PngIOStruct</a></div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;{</div>
<div class="line"><a name="l00096"></a><span class="lineno"><a class="code" href="struct_png_i_o_struct.html#aeb37c55d6d62735219e6c55e338b0a1e">   96</a></span>&#160;        BYTE* <a class="code" href="struct_png_i_o_struct.html#aeb37c55d6d62735219e6c55e338b0a1e">fp</a>;</div>
<div class="line"><a name="l00097"></a><span class="lineno"><a class="code" href="struct_png_i_o_struct.html#a494dc19955d31c1794a64aba2188e3ed">   97</a></span>&#160;        BYTE* <a class="code" href="struct_png_i_o_struct.html#a494dc19955d31c1794a64aba2188e3ed">buffer</a>;</div>
<div class="line"><a name="l00098"></a><span class="lineno"><a class="code" href="struct_png_i_o_struct.html#af6f9c509543d5b093452046569c78525">   98</a></span>&#160;        DWORD <a class="code" href="struct_png_i_o_struct.html#af6f9c509543d5b093452046569c78525">length</a>;</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;};</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;<span class="keyword">static</span> <span class="keywordtype">void</span> png_user_read_data(png_structp read_ptr, png_bytep data, png_size_t length)</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;{</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;        <a class="code" href="struct_png_i_o_struct.html">PngIOStruct</a>* read_io_ptr = (<a class="code" href="struct_png_i_o_struct.html">PngIOStruct</a>*) png_get_io_ptr(read_ptr);</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;        <span class="keywordflow">if</span> (!read_io_ptr)</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;        <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;        <span class="keywordflow">if</span> (read_io_ptr-&gt;<a class="code" href="struct_png_i_o_struct.html#aeb37c55d6d62735219e6c55e338b0a1e">fp</a> + length &lt; read_io_ptr-&gt;buffer + read_io_ptr-&gt;<a class="code" href="struct_png_i_o_struct.html#af6f9c509543d5b093452046569c78525">length</a>) {</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;                memcpy(data, read_io_ptr-&gt;<a class="code" href="struct_png_i_o_struct.html#aeb37c55d6d62735219e6c55e338b0a1e">fp</a>, length);</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;                read_io_ptr-&gt;<a class="code" href="struct_png_i_o_struct.html#aeb37c55d6d62735219e6c55e338b0a1e">fp</a> += length;</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;        }</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;}</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;<span class="keyword">static</span> <span class="keywordtype">void</span> png_user_write_data(png_structp png_ptr, png_bytep data, png_size_t length)</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;{</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;}</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;<span class="keyword">static</span> <span class="keywordtype">void</span> png_user_flush_data(png_structp png_ptr)</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;{</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;}</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;</div>
<div class="line"><a name="l00122"></a><span class="lineno"><a class="code" href="struct_png_image.html#a37be6e0c0c387ca94303b614746f1f98">  122</a></span>&#160;<span class="keywordtype">int</span> <a class="code" href="struct_png_image.html#a37be6e0c0c387ca94303b614746f1f98">PngImage::LoadBuffer</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>* buf, <span class="keywordtype">int</span> len)</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;{</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;        <span class="keywordtype">int</span> status = <a class="code" href="_png_image_8h.html#af9bdc3014f3d54c426b6d2df10de4960ad9f4cfad551953f9023df788acc5f637">PNG_INVALID</a>;</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;        <a class="code" href="struct_png_i_o_struct.html">PngIOStruct</a> io;</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;        <span class="keywordflow">if</span> (buf == NULL)</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;        <span class="keywordflow">return</span> <a class="code" href="_png_image_8h.html#af9bdc3014f3d54c426b6d2df10de4960a28ce36360f8107c765133608e0ea627e">PNG_NOFILE</a>;</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;        <span class="keywordflow">if</span> (png_sig_cmp(buf, (png_size_t)0, 8))</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;        <span class="keywordflow">return</span> <a class="code" href="_png_image_8h.html#af9bdc3014f3d54c426b6d2df10de4960ad9f4cfad551953f9023df788acc5f637">PNG_INVALID</a>;</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;        io.<a class="code" href="struct_png_i_o_struct.html#a494dc19955d31c1794a64aba2188e3ed">buffer</a> = buf;</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;        io.<a class="code" href="struct_png_i_o_struct.html#aeb37c55d6d62735219e6c55e338b0a1e">fp</a>     = buf;</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;        io.<a class="code" href="struct_png_i_o_struct.html#af6f9c509543d5b093452046569c78525">length</a> = len;</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;        png_structp png_ptr;</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;        png_infop   info_ptr;</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;        <span class="comment">/* Create and initialize the png_struct with the desired error handler</span></div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;<span class="comment">        * functions.  If you want to use the default stderr and longjump method,</span></div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;<span class="comment">        * you can supply NULL for the last three parameters.  We also supply the</span></div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;<span class="comment">        * the compiler header file version, so that we know if the application</span></div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;<span class="comment">        * was compiled with a compatible version of the library.  REQUIRED</span></div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;<span class="comment">        */</span></div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;        png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;        <span class="keywordflow">if</span> (!png_ptr) {</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;                <span class="keywordflow">return</span> <a class="code" href="_png_image_8h.html#af9bdc3014f3d54c426b6d2df10de4960a38ac1640a270d3de4edb0d4c552d2b83">PNG_NOMEM</a>;</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;        }</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;        <span class="comment">/* Allocate/initialize the memory for image information.  REQUIRED. */</span></div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;        info_ptr = png_create_info_struct(png_ptr);</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;        <span class="keywordflow">if</span> (!info_ptr) {</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;                png_destroy_read_struct(&amp;png_ptr, <a class="code" href="_png_image_8cpp.html#acad208b3e5753b679e6ef8d761d53d9f">png_infopp_NULL</a>, <a class="code" href="_png_image_8cpp.html#acad208b3e5753b679e6ef8d761d53d9f">png_infopp_NULL</a>);</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;                <span class="keywordflow">return</span> <a class="code" href="_png_image_8h.html#af9bdc3014f3d54c426b6d2df10de4960a38ac1640a270d3de4edb0d4c552d2b83">PNG_NOMEM</a>;</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;        }</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;        png_set_read_fn(png_ptr, (<span class="keywordtype">void</span> *) (&amp;io), png_user_read_data);</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;        png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, <a class="code" href="_png_image_8cpp.html#a4fd4a14c32e2bbab39b1deac1ccd28ec">png_voidp_NULL</a>);</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;        status = <a class="code" href="struct_png_image.html#ae7af2b78e9d7afbb021310a4ee6a8b0a">CreateImage</a>(png_ptr, info_ptr);</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;        png_destroy_read_struct(&amp;png_ptr, &amp;info_ptr, <a class="code" href="_png_image_8cpp.html#acad208b3e5753b679e6ef8d761d53d9f">png_infopp_NULL</a>);</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;        <span class="keywordflow">return</span> status;</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;}</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;<span class="comment">// +--------------------------------------------------------------------+</span></div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;<span class="keywordtype">int</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"><a class="code" href="struct_png_image.html#ae7af2b78e9d7afbb021310a4ee6a8b0a">  172</a></span>&#160;<a class="code" href="struct_png_image.html#ae7af2b78e9d7afbb021310a4ee6a8b0a">PngImage::CreateImage</a>(png_structp png_ptr, png_infop info_ptr)</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;{</div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;        <span class="keywordtype">int</span> status = <a class="code" href="_png_image_8h.html#af9bdc3014f3d54c426b6d2df10de4960ad9f4cfad551953f9023df788acc5f637">PNG_INVALID</a>;</div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;        <a class="code" href="struct_png_image.html#a30a29d1b55f7d7957b0eda28f9fc3388">width</a>  = png_get_image_width(png_ptr, info_ptr);</div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;        <a class="code" href="struct_png_image.html#a2ed0578c07fc93fab6901524f8f264a4">height</a> = png_get_image_height(png_ptr, info_ptr);</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;        <a class="code" href="struct_png_image.html#a645eb77dbd2ab2cf59bb0d3e18fe11e8">bpp</a>    = png_get_bit_depth(png_ptr, info_ptr);</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;        <span class="keywordflow">if</span> (<a class="code" href="struct_png_image.html#a30a29d1b55f7d7957b0eda28f9fc3388">width</a> &gt; 0 &amp;&amp; width &lt; 32768 &amp;&amp; height &gt; 0 &amp;&amp; <a class="code" href="struct_png_image.html#a2ed0578c07fc93fab6901524f8f264a4">height</a> &lt; 32768) {</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;                <span class="comment">// true-color:</span></div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;                <span class="keywordflow">if</span> (<a class="code" href="struct_png_image.html#a645eb77dbd2ab2cf59bb0d3e18fe11e8">bpp</a> &gt;= 24) {</div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;                        status = <a class="code" href="_png_image_8h.html#af9bdc3014f3d54c426b6d2df10de4960a4dd699113fbe010c8db17e53d985ee36">PNG_OK</a>;</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;                        <span class="keywordflow">if</span> ( png_get_channels(png_ptr, info_ptr) == 4)</div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;                        <a class="code" href="struct_png_image.html#a3569e4f89bc7cf87e5f51a9daa5e3ded">alpha_loaded</a> = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;</div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;                        <a class="code" href="struct_png_image.html#a82bdc04b944ce9904da0412cc4dc1e95">image</a> = <span class="keyword">new</span> DWORD[<a class="code" href="struct_png_image.html#a30a29d1b55f7d7957b0eda28f9fc3388">width</a>*<a class="code" href="struct_png_image.html#a2ed0578c07fc93fab6901524f8f264a4">height</a>];</div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;                        BYTE** rows = png_get_rows(png_ptr, info_ptr);</div>
<div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;</div>
<div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;                        <span class="keywordflow">for</span> (DWORD row = 0; row &lt; <a class="code" href="struct_png_image.html#a2ed0578c07fc93fab6901524f8f264a4">height</a>; row++) {</div>
<div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;                                BYTE* p = rows[row];</div>
<div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;</div>
<div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;                                <span class="keywordflow">for</span> (DWORD col = 0; col &lt; <a class="code" href="struct_png_image.html#a30a29d1b55f7d7957b0eda28f9fc3388">width</a>; col++) {</div>
<div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;                                        DWORD red   = *p++;</div>
<div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;                                        DWORD green = *p++;</div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;                                        DWORD blue  = *p++;</div>
<div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;                                        DWORD alpha = 0xff;</div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;</div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;                                        <span class="keywordflow">if</span> ( png_get_channels(png_ptr, info_ptr) == 4)</div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;                                        alpha = *p++;</div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;</div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;                                        <a class="code" href="struct_png_image.html#a82bdc04b944ce9904da0412cc4dc1e95">image</a>[row*width+col] = (alpha &lt;&lt; 24) | (red &lt;&lt; 16) | (green &lt;&lt; 8) | blue;</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;                                }</div>
<div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;                        }</div>
<div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;                }</div>
<div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;</div>
<div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;                <span class="comment">// paletted:</span></div>
<div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;                <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="struct_png_image.html#a645eb77dbd2ab2cf59bb0d3e18fe11e8">bpp</a> == 8) {</div>
<div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;                        DWORD pal[256];</div>
<div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;                        </div>
<div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;                        png_bytep trans_alpha; <span class="keywordtype">int</span> num_trans; png_color_16p trans_color;</div>
<div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;                        png_colorp palette;</div>
<div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;                        <span class="keywordtype">int</span> num_palette;</div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;</div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;                        png_get_tRNS(png_ptr, info_ptr, &amp;trans_alpha, &amp;num_trans, &amp;trans_color);</div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;                        png_get_PLTE(png_ptr, info_ptr, &amp;palette, &amp;num_palette);</div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;</div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;                        <span class="keywordflow">if</span> (num_trans &gt; 0)</div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;                        <a class="code" href="struct_png_image.html#a3569e4f89bc7cf87e5f51a9daa5e3ded">alpha_loaded</a> = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;</div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;                        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; 256; i++) {</div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;                                <span class="keywordflow">if</span> (i &lt; num_palette) {</div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;                                        DWORD red   = palette[i].red;</div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;                                        DWORD green = palette[i].green;</div>
<div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;                                        DWORD blue  = palette[i].blue;</div>
<div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;                                        DWORD alpha = 0xff;</div>
<div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;</div>
<div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;                                        <span class="keywordflow">if</span> (i &lt; num_trans)</div>
<div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;                                        alpha = trans_alpha[i];</div>
<div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;                                        </div>
<div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;                                        pal[i] = (alpha &lt;&lt; 24) | (red &lt;&lt; 16) | (green &lt;&lt; 8) | blue;</div>
<div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;                                }</div>
<div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;</div>
<div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;                                <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;                                        pal[i] = 0;</div>
<div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;                                }</div>
<div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;                        }</div>
<div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;</div>
<div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;                        <a class="code" href="struct_png_image.html#a82bdc04b944ce9904da0412cc4dc1e95">image</a> = <span class="keyword">new</span> DWORD[<a class="code" href="struct_png_image.html#a30a29d1b55f7d7957b0eda28f9fc3388">width</a>*<a class="code" href="struct_png_image.html#a2ed0578c07fc93fab6901524f8f264a4">height</a>];</div>
<div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;                        BYTE** rows = png_get_rows(png_ptr, info_ptr);</div>
<div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;</div>
<div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;                        <span class="keywordflow">for</span> (DWORD row = 0; row &lt; <a class="code" href="struct_png_image.html#a2ed0578c07fc93fab6901524f8f264a4">height</a>; row++) {</div>
<div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;                                BYTE* p = rows[row];</div>
<div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;</div>
<div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;                                <span class="keywordflow">for</span> (DWORD col = 0; col &lt; <a class="code" href="struct_png_image.html#a30a29d1b55f7d7957b0eda28f9fc3388">width</a>; col++) {</div>
<div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;                                        BYTE index = *p++;</div>
<div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;                                        <a class="code" href="struct_png_image.html#a82bdc04b944ce9904da0412cc4dc1e95">image</a>[row*width+col] = pal[index];</div>
<div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;                                }</div>
<div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;                        }</div>
<div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;                }</div>
<div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;        }</div>
<div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;</div>
<div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160;        <span class="keywordflow">return</span> status;</div>
<div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;}</div>
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