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<div class="title">PngImage.cpp</div> </div>
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<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> <span class="comment">/* Project nGenEx</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> Destroyer Studios LLC</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> Copyright © 1997-2004. All Rights Reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"></span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> SUBSYSTEM: nGenEx.lib</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> FILE: PngImage.cpp</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> AUTHOR: John DiCamillo</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"></span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"></span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> OVERVIEW</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> ========</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> BMP image file loader</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include "<a class="code" href="_mem_debug_8h.html">MemDebug.h</a>"</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include "<a class="code" href="_png_image_8h.html">PngImage.h</a>"</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include <string.h></span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <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> <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> <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> <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> <span class="preprocessor"></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include "png.h"</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">// +--------------------------------------------------------------------+</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
<div class="line"><a name="l00032"></a><span class="lineno"><a class="code" href="struct_png_image.html#ae3f602ac30a4e1909bb1b9fd7619c699"> 32</a></span> <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> : width(0), height(0), bpp(0), alpha_loaded(false), image(0)</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> { }</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div>
<div class="line"><a name="l00036"></a><span class="lineno"><a class="code" href="struct_png_image.html#ad2a2196589ecd9b5b8b748b8272707c6"> 36</a></span> <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> {</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <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> }</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment">// +--------------------------------------------------------------------+</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div>
<div class="line"><a name="l00043"></a><span class="lineno"><a class="code" href="struct_png_image.html#a0d2d083dfb611fdb1fdb056511bf415f"> 43</a></span> <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> {</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <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>  FILE* f;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  fopen_s(&f, filename,<span class="stringliteral">"rb"</span>);</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">if</span> (f == NULL)</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <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> </div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  BYTE buf[12];</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  fread(buf, 8, 1, f);</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  fseek(f, 0, SEEK_SET);</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <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>  <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> </div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  png_structp png_ptr;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  png_infop info_ptr;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <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> <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> <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> <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> <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> <span class="comment"> */</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  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> </div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">if</span> (!png_ptr) {</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <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>  }</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <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>  info_ptr = png_create_info_struct(png_ptr);</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">if</span> (!info_ptr) {</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  png_destroy_read_struct(&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>  <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>  }</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  png_init_io(png_ptr, f);</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  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> </div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  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> </div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  png_destroy_read_struct(&png_ptr, &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> </div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  fclose(f);</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">return</span> status;</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> }</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment">// +--------------------------------------------------------------------+</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> </div>
<div class="line"><a name="l00094"></a><span class="lineno"><a class="code" href="struct_png_i_o_struct.html"> 94</a></span> <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> {</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>  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>  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>  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> };</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <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> {</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <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> </div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">if</span> (!read_io_ptr)</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">if</span> (read_io_ptr-><a class="code" href="struct_png_i_o_struct.html#aeb37c55d6d62735219e6c55e338b0a1e">fp</a> + length < read_io_ptr->buffer + read_io_ptr-><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>  memcpy(data, read_io_ptr-><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>  read_io_ptr-><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>  }</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> }</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <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> {</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> }</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <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> {</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> }</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> </div>
<div class="line"><a name="l00122"></a><span class="lineno"><a class="code" href="struct_png_image.html#a37be6e0c0c387ca94303b614746f1f98"> 122</a></span> <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> {</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <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>  <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> </div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">if</span> (buf == NULL)</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <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> </div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <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>  <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> </div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  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>  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>  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> </div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  png_structp png_ptr;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  png_infop info_ptr;</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> </div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <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> <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> <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> <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> <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> <span class="comment"> */</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  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> </div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordflow">if</span> (!png_ptr) {</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <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>  }</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> </div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <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>  info_ptr = png_create_info_struct(png_ptr);</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">if</span> (!info_ptr) {</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  png_destroy_read_struct(&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>  <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>  }</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  png_set_read_fn(png_ptr, (<span class="keywordtype">void</span> *) (&io), png_user_read_data);</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  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> </div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  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> </div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  png_destroy_read_struct(&png_ptr, &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> </div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordflow">return</span> status;</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> }</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> </div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="comment">// +--------------------------------------------------------------------+</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> </div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <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> <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> {</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <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> </div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <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>  <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>  <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> </div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordflow">if</span> (<a class="code" href="struct_png_image.html#a30a29d1b55f7d7957b0eda28f9fc3388">width</a> > 0 && width < 32768 && height > 0 && <a class="code" href="struct_png_image.html#a2ed0578c07fc93fab6901524f8f264a4">height</a> < 32768) {</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="comment">// true-color:</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keywordflow">if</span> (<a class="code" href="struct_png_image.html#a645eb77dbd2ab2cf59bb0d3e18fe11e8">bpp</a> >= 24) {</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  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> </div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <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>  <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> </div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <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>  BYTE** rows = png_get_rows(png_ptr, info_ptr);</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> </div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="keywordflow">for</span> (DWORD row = 0; row < <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>  BYTE* p = rows[row];</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> </div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="keywordflow">for</span> (DWORD col = 0; col < <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>  DWORD red = *p++;</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  DWORD green = *p++;</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  DWORD blue = *p++;</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  DWORD alpha = 0xff;</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> </div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <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>  alpha = *p++;</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> </div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <a class="code" href="struct_png_image.html#a82bdc04b944ce9904da0412cc4dc1e95">image</a>[row*width+col] = (alpha << 24) | (red << 16) | (green << 8) | blue;</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  }</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  }</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  }</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> </div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="comment">// paletted:</span></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <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>  DWORD pal[256];</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  </div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  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>  png_colorp palette;</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keywordtype">int</span> num_palette;</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> </div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  png_get_tRNS(png_ptr, info_ptr, &trans_alpha, &num_trans, &trans_color);</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette);</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> </div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="keywordflow">if</span> (num_trans > 0)</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <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> </div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < 256; i++) {</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="keywordflow">if</span> (i < num_palette) {</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  DWORD red = palette[i].red;</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  DWORD green = palette[i].green;</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  DWORD blue = palette[i].blue;</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  DWORD alpha = 0xff;</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> </div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="keywordflow">if</span> (i < num_trans)</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  alpha = trans_alpha[i];</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  </div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  pal[i] = (alpha << 24) | (red << 16) | (green << 8) | blue;</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  }</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> </div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  pal[i] = 0;</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  }</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  }</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> </div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <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>  BYTE** rows = png_get_rows(png_ptr, info_ptr);</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> </div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keywordflow">for</span> (DWORD row = 0; row < <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>  BYTE* p = rows[row];</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span> </div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keywordflow">for</span> (DWORD col = 0; col < <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>  BYTE index = *p++;</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <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>  }</div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  }</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  }</div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  }</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> </div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="keywordflow">return</span> status;</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> }</div>
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