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POHow to load Photoshop png with LIBPNG?
 

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  1. POHow to load Photoshop png with LIBPNG?
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    <p>I am facing some problems to load some specific png images. Here are some helpful images.</p> <ol> <li>Image #1 www.silexars.com/image.png (Doesn't load properly)</li> <li>Image #2 www.silexars.com/image2.png (Loads fine)</li> <li>Screenshot of Image #1 rendered with OpenGL <a href="http://www.silexars.com/screenshot.jpg" rel="nofollow">http://www.silexars.com/screenshot.jpg</a></li> <li>Screenshot of PNG Analyzer with both images open: <a href="http://www.silexars.com/screenshot.png" rel="nofollow">http://www.silexars.com/screenshot.png</a> Image #1 @ Left, Image #2 @ Right</li> </ol> <p>I've noticed that the left image has a chunk called cHRM and I believe I have to convert it somehow. Would someone help me with this issue?</p> <p>The code that I am using for loading the png file is:</p> <pre><code>uint8 Graphics::Image::loadPNG(FILE *fp) { uint8 header[8]; fread(header,sizeof(header),1,fp); if (png_sig_cmp(header,0,sizeof(header))) return INVALID_FILE; png_structp png; png_infop info; png = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0); if (!png) return FAILURE; info = png_create_info_struct(png); if (!info) { png_destroy_read_struct(&amp;png,0,0); return FAILURE; } png_init_io(png,fp);\ png_set_sig_bytes(png,sizeof(header)); png_read_info(png,info); delete[] data; data = 0; int32 bitdepth,colortype; png_get_IHDR(png,info,&amp;width,&amp;height,&amp;bitdepth,&amp;colortype,0,0,0); if (colortype == PNG_COLOR_TYPE_PALETTE) { png_set_palette_to_rgb(png); } if (colortype == PNG_COLOR_TYPE_GRAY &amp;&amp; bitdepth &lt; 8) { png_set_expand_gray_1_2_4_to_8(png); } if (colortype == PNG_COLOR_TYPE_GRAY || colortype == PNG_COLOR_TYPE_GRAY_ALPHA) { png_set_gray_to_rgb(png); } if (png_get_valid(png, info, PNG_INFO_tRNS)) { png_set_tRNS_to_alpha(png); } if (colortype == PNG_COLOR_TYPE_RGB) { png_set_filler(png, 0xff, PNG_FILLER_AFTER); } if (bitdepth == 16) { png_set_strip_16(png); } if (bitdepth &lt; 8) png_set_packing(png); png_read_update_info(png,info); png_get_IHDR(png,info,&amp;width,&amp;height,0,0,0,0,0); int32 rowbytes = png_get_rowbytes(png,info); std::cout &lt;&lt; rowbytes/bpp &lt;&lt; std::endl; data = new uint8[rowbytes*height]; png_bytep *row_pointers = new png_bytep[height*sizeof(png_bytep)]; for (int i = 0; i &lt; height; i++) row_pointers[height-1-i] = data + i * rowbytes; png_read_image(png, row_pointers); png_read_end(png,0); delete[] row_pointers; png_destroy_read_struct(&amp;png,&amp;info,0); return OK; } </code></pre> <p>Hope the info is enough. But if you need any extra data, just ask me.</p>
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