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POHow to compress image on linux?
 

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  1. POHow to compress image on linux?
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    <p>I am writing function to compress image using GDI+ on windows, and it's working well,</p> <pre><code>void ImageProcessorImpl::compressImpl(const std::string&amp; path, int size, UInt8 quality) { HBITMAP hbmReturn = NULL; Bitmap* bmPhoto = NULL; std::wstring upath; UnicodeConverter::toUTF16(path, upath); // make source file close automatically, Bitmap detructor will be called { Bitmap image(upath.c_str()); int srcWidth = image.GetWidth(); int srcHeight = image.GetHeight(); float percent = 0; int destX = 0, destY = 0; if (srcWidth &gt; srcHeight) { percent = ((float)size/(float)srcWidth); destX = (int)((size - (srcWidth * percent))/2); } else { percent = ((float)size/(float)srcHeight); destY = (int)((size - (srcHeight * percent))/2); } if (percent &gt;= 1.0f) return; // skip compress int destWidth = (int)(srcWidth * percent); int destHeight = (int)(srcHeight * percent); bmPhoto = new Bitmap(destWidth, destHeight, PixelFormat24bppRGB); bmPhoto-&gt;SetResolution(image.GetHorizontalResolution(), image.GetVerticalResolution()); Graphics *grPhoto = Graphics::FromImage(bmPhoto); Color colorW(255, 255, 255, 255); grPhoto-&gt;Clear(colorW); grPhoto-&gt;SetInterpolationMode(InterpolationModeHighQualityBicubic); grPhoto-&gt;DrawImage(&amp;image, Rect(destX, destY, destWidth, destHeight)); bmPhoto-&gt;GetHBITMAP(colorW, &amp;hbmReturn); delete grPhoto; } // end source image file, Bitmap image(upath.c_str()); // find appropriate encoder, jpeg CLSID encoderClsid; getEncoderClsid(L"image/jpeg", &amp;encoderClsid); // set output quality for jpeg alone EncoderParameters encoderParameters; setEncoderQuality(&amp;encoderParameters, &amp;quality); // output to image file with desired quality bmPhoto-&gt;Save(upath.c_str(), &amp;encoderClsid, &amp;encoderParameters); // release resources delete bmPhoto; DeleteObject(hbmReturn); } int ImageProcessorImpl::getEncoderClsid(const WCHAR* format, void* clsid) { UINT num = 0; // number of image encoders UINT size = 0; // size of the image encoder array in bytes ImageCodecInfo* pImageCodecInfo = NULL; GetImageEncodersSize(&amp;num, &amp;size); if(size == 0) return -1; // Failure pImageCodecInfo = (ImageCodecInfo*)(malloc(size)); if(pImageCodecInfo == NULL) return -1; // Failure GetImageEncoders(num, size, pImageCodecInfo); for (UINT j = 0; j &lt; num; ++j) { if (wcscmp(pImageCodecInfo[j].MimeType, format) == 0) { *(CLSID*)clsid = pImageCodecInfo[j].Clsid; free(pImageCodecInfo); return j; //Success } } free(pImageCodecInfo); return -1; // Failure } void ImageProcessorImpl::setEncoderQuality(void* params, UInt8* quality) { EncoderParameters* encoderParams = (EncoderParameters*)params; encoderParams-&gt;Count = 1; encoderParams-&gt;Parameter[0].Guid = EncoderQuality; encoderParams-&gt;Parameter[0].Type = EncoderParameterValueTypeLong; encoderParams-&gt;Parameter[0].NumberOfValues = 1; encoderParams-&gt;Parameter[0].Value = quality; } </code></pre> <p>But, I want to have this function on linux, I don't know what lib I can use to implement such function on linux, who can help me? Thnx</p>
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