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110 lines
4.6 KiB
C++
110 lines
4.6 KiB
C++
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/*
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#
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# File : use_jpeg_buffer.cpp
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# ( C++ source file )
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#
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# Description : Example of use for the CImg plugin 'plugins/jpeg_buffer.h'.
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# This file is a part of the CImg Library project.
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# ( http://cimg.eu )
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#
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# Copyright : Paolo Prete
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# ( p4olo_prete(at)yahoo.it )
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#
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# License : CeCILL v2.0
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# ( http://www.cecill.info/licences/Licence_CeCILL_V2-en.html )
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#
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# This software is governed by the CeCILL license under French law and
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# abiding by the rules of distribution of free software. You can use,
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# modify and/ or redistribute the software under the terms of the CeCILL
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# license as circulated by CEA, CNRS and INRIA at the following URL
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# "http://www.cecill.info".
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#
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# As a counterpart to the access to the source code and rights to copy,
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# modify and redistribute granted by the license, users are provided only
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# with a limited warranty and the software's author, the holder of the
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# economic rights, and the successive licensors have only limited
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# liability.
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#
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# In this respect, the user's attention is drawn to the risks associated
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# with loading, using, modifying and/or developing or reproducing the
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# software by the user in light of its specific status of free software,
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# that may mean that it is complicated to manipulate, and that also
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# therefore means that it is reserved for developers and experienced
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# professionals having in-depth computer knowledge. Users are therefore
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# encouraged to load and test the software's suitability as regards their
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# requirements in conditions enabling the security of their systems and/or
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# data to be ensured and, more generally, to use and operate it in the
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# same conditions as regards security.
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#
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# The fact that you are presently reading this means that you have had
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# knowledge of the CeCILL license and that you accept its terms.
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#
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*/
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// These includes are necessary to get the plug-in compile !
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#include <cstdio>
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#include <jpeglib.h>
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#include <jerror.h>
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// Define plugin and include the CImg Library.
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#define cimg_plugin "plugins/jpeg_buffer.h"
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#include "CImg.h"
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using namespace cimg_library;
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// Main procedure
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//----------------
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int main() {
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// Create a jpeg memory buffer from the content of a jpeg file.
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// (this is for testing purposes only)
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const char *filename_input = "foo.jpg";
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std::fprintf(stderr," - Reading file '%s'\n",filename_input);
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std::FILE *file_input = std::fopen(filename_input,"rb");
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if (!file_input) { std::fprintf(stderr,"Input JPEG file not found !"); std::exit(0); }
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std::fprintf(stderr," - Construct input JPEG-coded buffer\n");
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unsigned buf_size = 500000; // Put the file size here !
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JOCTET *buffer_input = new JOCTET[buf_size];
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if (std::fread(buffer_input,sizeof(JOCTET),buf_size,file_input)) std::fclose(file_input);
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// -> 'buffer_input' is now a valid jpeg-coded memory buffer.
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// Create a CImg instance from the jpeg-coded buffer using the plug-in function.
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std::fprintf(stderr," - Create CImg instance from JPEG-coded buffer\n");
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CImg<unsigned char> img;
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img.load_jpeg_buffer(buffer_input, buf_size);
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delete[] buffer_input;
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// Do you image processing stuff here ....
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// Here, we just mirror the image and write "hello".
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std::fprintf(stderr," - Do simple processing\n");
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const unsigned char purple[] = { 255, 0, 0 };
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const unsigned char black[] = { 0, 0, 0 };
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img.mirror('y').draw_text(0,0," Hello! ",purple,black,1,57);
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// Display image to see if everything's fine.
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img.display("Using 'jpeg_buffer.h' plugin");
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// Define a new JOCTET array where the processed image has to be saved
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// (we don't know its dimension before compressing it, therefore we have to allocate enough memory )
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std::fprintf(stderr," - Construct output JPEG-coded buffer\n");
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JOCTET *buffer_output = new JOCTET[2*buf_size];
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// Save processed image into this JOCTET buffer, compressed as jpeg.
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// This is done again by using the plug-in function.
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img.save_jpeg_buffer(buffer_output,buf_size,60);
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// Note that here, the variable 'buf_size' contains the length of the
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// data which have been written in the given output buffer.
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// Copy the content of the above array into a new file
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// (it should give you a valid JPEG file then !)
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const char *filename_output = "foo_output.jpg";
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std::fprintf(stderr," - Save output file '%s'\n",filename_output);
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std::FILE* file_output = std::fopen(filename_output,"wb");
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std::fwrite(buffer_output, sizeof(JOCTET), buf_size, file_output);
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std::fclose(file_output);
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delete[] buffer_output;
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std::fprintf(stderr," - All done !\n");
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return 0;
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}
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