利用CxImage实现编解码Gif图像代码举例

来源：互联网发布：ipv6网络电视编辑：程序博客网时间：2024/06/05 09:10

Gif(GraphicsInterchange Format，图形交换格式)是由CompuServe公司在1987年开发的图像文件格式，分为87a和89a两种版本。Gif是基于LZW算法的无损压缩算法。Gif图像是基于颜色表的，最多只支持8位(256色)。Gif减少了图像调色板中的色彩数量，从而在存储时达到减少图像文件大小的目的。Gif分为静态Gif和动画Gif两种，扩展名为.gif，是一种压缩位图格式，支持透明背景图像，适用于多种操作系统。

下面利用CxImage开源库，实现对Gif图像进行编解码，主要包括3个文件：

1. funset.h :

#ifndef _FUNSET_H_#define _FUNSET_H_#include <string>using namespace std;void decoding_gif(string strGifName, string strSavePath);void encoding_gif(string strImgPath, string strGifName);#endif //_FUNSET_H_

2. funset.cpp:

#include "stdafx.h"#include "funset.h"#include <iostream>#include "../CxImage/ximagif.h"#include <io.h>using namespace std;void decoding_gif(string strGifName, string strSavePath){CxImage img;img.Load(strGifName.c_str(), CXIMAGE_FORMAT_GIF);int iNumFrames = img.GetNumFrames();cout<<"frames num = "<<iNumFrames<<endl;CxImage* newImage = new CxImage();for (int i = 0; i < iNumFrames; i++) {newImage->SetFrame(i);newImage->Load(strGifName.c_str(), CXIMAGE_FORMAT_GIF);char tmp[64];sprintf(tmp, "%d", i);string tmp1;tmp1 = tmp1.insert(0, tmp);tmp1 = strSavePath + tmp1 + ".png";newImage->Save(tmp1.c_str(), CXIMAGE_FORMAT_PNG);}if (newImage) delete newImage;}int TraverseFolder(const string strFilePath, string strImageNameSets[]){int iImageCount=0;_finddata_t fileInfo;long handle = _findfirst(strFilePath.c_str(), &fileInfo);if (handle == -1L) {cerr << "failed to transfer files" << endl;return -1;}do {//cout << fileInfo.name <<endl;strImageNameSets[iImageCount] = (string)fileInfo.name;iImageCount ++;} while (_findnext(handle, &fileInfo) == 0);return iImageCount;}void encoding_gif(string strImgPath, string strGifName){string strImgSets[100] = {};int iImgCount = TraverseFolder(strImgPath, strImgSets);string strTmp = strImgPath.substr(0, strImgPath.find_last_of("/") +1);CxImage** img = new CxImage*[iImgCount];if (img == NULL) {cout<<"new Cximage error!"<<endl;return;}for (int i = 0; i < iImgCount; i++) {string tmp1;tmp1 = strTmp + strImgSets[i];img[i] = new CxImage;img[i]->Load(tmp1.c_str(), CXIMAGE_FORMAT_PNG);}CxIOFile hFile;hFile.Open(strGifName.c_str(), "wb");CxImageGIF multiimage;multiimage.SetLoops(3);multiimage.SetDisposalMethod(2);multiimage.Encode(&hFile, img, iImgCount, false, false);hFile.Close();delete [] img;}

3. main.cpp:

#include "stdafx.h"#include <iostream>#include "funset.h"using namespace std;int main(int argc, char* argv[]){string strGifName = "../../Data/fire.gif";string strSavaPath = "../../Data/";decoding_gif(strGifName, strSavaPath);string strImgPath = "../../Data/*.png";strGifName = "../../Data/tmp.gif";encoding_gif(strImgPath, strGifName);cout<<"ok!!!"<<endl;return 0;}

利用CxImage实现起来简单吧！！！^_^

GitHub：https://github.com/fengbingchun/CxImage_Test

0 0