mirror of https://github.com/edeproject/ede.git
105 lines
2.3 KiB
C++
105 lines
2.3 KiB
C++
//
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// PImageLoaderJpeg.cc for pekwm
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// Copyright © 2005-2009 Claes Nästén <me@pekdon.net>
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//
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// This program is licensed under the GNU GPL.
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// See the LICENSE file for more information.
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//
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif // HAVE_CONFIG_H
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#ifdef HAVE_IMAGE_JPEG
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#include "PImageLoaderJpeg.hh"
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#include <iostream>
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extern "C" {
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#include <stdio.h>
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#include <jpeglib.h>
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}
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using std::string;
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using std::cerr;
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using std::endl;
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//! @brief PImageLoaderJpeg constructor.
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PImageLoaderJpeg::PImageLoaderJpeg(void)
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: PImageLoader("JPG")
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{
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}
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//! @brief PImageLoaderJpeg destructor.
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PImageLoaderJpeg::~PImageLoaderJpeg(void)
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{
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}
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//! @brief Loads file into data.
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//! @param file File to load data from.
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//! @param width Set to the width of image.
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//! @param height Set to the height of image.
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//! @param alpha Set to wheter image has alpha channel.
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//! @return Pointer to data on success, else 0.
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uchar*
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PImageLoaderJpeg::load(const std::string &file, uint &width, uint &height,
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bool &alpha, bool &use_alpha)
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{
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FILE *fp;
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fp= fopen(file.c_str(), "rb");
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if (! fp) {
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cerr << " *** WARNING: unable to open " << file << " for reading!" << endl;
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return 0;
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}
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struct jpeg_decompress_struct cinfo;
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struct jpeg_error_mgr jerr;
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cinfo.err = jpeg_std_error(&jerr);
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jpeg_create_decompress(&cinfo);
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jpeg_stdio_src(&cinfo, fp);
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// Read jpeg header.
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jpeg_read_header(&cinfo, TRUE);
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// Make sure we get data in 24bit RGB.
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if (cinfo.out_color_space != JCS_RGB)
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cinfo.out_color_space = JCS_RGB;
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jpeg_start_decompress(&cinfo);
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uint channels;
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uint rowbytes;
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width = cinfo.output_width;
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height = cinfo.output_height;
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channels = cinfo.output_components;
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rowbytes = width * channels;
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// Allocate image data.
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uchar *data = new uchar[width * height * channels];
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// Read image.
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JSAMPROW row;
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for (uint i = 0; i < height; ++i) {
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row = data + i * rowbytes;
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jpeg_read_scanlines(&cinfo, &row, 1);
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}
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// Clean up.
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jpeg_finish_decompress(&cinfo);
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jpeg_destroy_decompress(&cinfo);
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fclose(fp);
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alpha = false; // Jpeg doesn't support alpha.
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use_alpha = false; // Jpeg doesn't support alpha.
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return data;
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}
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#endif // HAVE_IMAGE_JPEG
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