crop_resize
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crop_resize [2014/01/25 11:28] (current) admin created |
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| + | This was adapted from a php script to do the same by Mike Zriel (http://www.zriel.com/lamp/54-crop-and-rescale-images-function-using-gd-library) | ||
| + | <code> | ||
| + | bool CompareImages::cropImageAndRescale (Image image) { | ||
| + | gdImagePtr imageOld, imageNew; | ||
| + | Split splt; | ||
| + | FILE *sourceFd; | ||
| + | vector<string> elements = splt.split(image.sourceImage,'.'); | ||
| + | | ||
| + | string ext = elements.back(); | ||
| + | if (ext == "jpg" || ext == "jpeg") { | ||
| + | sourceFd = fopen(image.sourceImage.c_str(),"r"); | ||
| + | imageOld = gdImageCreateFromJpeg( sourceFd ); | ||
| + | } else if (ext == "gif") { | ||
| + | imageOld = gdImageCreateFromGif( sourceFd ); | ||
| + | } else if (ext == "png") { | ||
| + | imageOld = gdImageCreateFromPng( sourceFd ); | ||
| + | } else { | ||
| + | return false; | ||
| + | } | ||
| + | int widthOld = gdImageSX(imageOld); | ||
| + | int heightOld = gdImageSY(imageOld); | ||
| + | imageNew = gdImageCreateTrueColor(image.outputWidth, image.outputHeight); | ||
| + | image.print(); | ||
| + | gdImageCopyResized(imageNew, imageOld, 0, 0, image.posX, image.posY, image.outputWidth, image.outputHeight, image.cropWidth, image.cropHeight); | ||
| + | FILE *out = fopen(image.targetImage.c_str(), "wb"); | ||
| + | gdImagePng(imageNew, out); | ||
| + | fclose(out); | ||
| + | fclose(sourceFd); | ||
| + | gdImageDestroy(imageNew); | ||
| + | gdImageDestroy(imageOld); | ||
| + | } | ||
| + | </code> | ||
| + | |||
| + | <code> | ||
| + | #ifndef IMAGE_H | ||
| + | #define IMAGE_H | ||
| + | #include <string> | ||
| + | |||
| + | using namespace std; | ||
| + | |||
| + | |||
| + | class Image | ||
| + | { | ||
| + | public: | ||
| + | string sourceImage; | ||
| + | string targetImage; | ||
| + | int cropWidth; | ||
| + | int cropHeight; | ||
| + | int posX; | ||
| + | int posY; | ||
| + | int outputWidth; | ||
| + | int outputHeight; | ||
| + | void set( string m_sourceImage, string m_targetImage, int m_cropWidth, int m_cropHeight, int m_posX, int m_posY, int m_outputWidth, int m_outputHeight) | ||
| + | { | ||
| + | sourceImage=m_sourceImage; | ||
| + | targetImage=m_targetImage; | ||
| + | cropWidth=m_cropWidth; | ||
| + | cropHeight=m_cropHeight; | ||
| + | posX=m_posX; | ||
| + | posY=m_posY; | ||
| + | outputWidth=m_outputWidth; | ||
| + | outputHeight=m_outputHeight; | ||
| + | } | ||
| + | void print () | ||
| + | { | ||
| + | cout <<"cropWidth "<< cropWidth<<endl; | ||
| + | cout <<"cropHeight "<< cropHeight <<endl; | ||
| + | cout <<"posX "<< posX<<endl; | ||
| + | cout <<"posY "<< posY<<endl; | ||
| + | cout <<"outputWidth "<< outputWidth<<endl; | ||
| + | cout <<"outputHeight "<< outputHeight<<endl; | ||
| + | } | ||
| + | }; | ||
| + | #endif | ||
| + | </code> | ||
| + | |||
| + | Examples | ||
| + | |||
| + | <code> | ||
| + | Image im; | ||
| + | //void set( string m_sourceImage, string m_targetImage, int m_cropWidth, int m_cropHeight, int m_posX, int m_posY, int m_outputWidth, int m_outputHeight) | ||
| + | im.set("/run/shm/goal.jpg","/home/pi/smgoal.jpg",450,130,0,70,450,333); | ||
| + | compareImages.cropImageAndRescale(im); | ||
| + | im.set("/run/shm/goal.jpg","/home/pi/xsmgoal.jpg",450,330,0,0,225,166); | ||
| + | compareImages.cropImageAndRescale(im); | ||
| + | </code> | ||
crop_resize.txt ยท Last modified: 2014/01/25 11:28 by admin
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