mirror of
https://github.com/edeproject/ede.git
synced 2023-08-10 21:13:03 +03:00
105 lines
2.3 KiB
C++
105 lines
2.3 KiB
C++
//
|
|
// PImageLoaderJpeg.cc for pekwm
|
|
// Copyright © 2005-2009 Claes Nästén <me@pekdon.net>
|
|
//
|
|
// This program is licensed under the GNU GPL.
|
|
// See the LICENSE file for more information.
|
|
//
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif // HAVE_CONFIG_H
|
|
|
|
#ifdef HAVE_IMAGE_JPEG
|
|
|
|
#include "PImageLoaderJpeg.hh"
|
|
|
|
#include <iostream>
|
|
|
|
extern "C" {
|
|
#include <stdio.h>
|
|
#include <jpeglib.h>
|
|
}
|
|
|
|
using std::string;
|
|
using std::cerr;
|
|
using std::endl;
|
|
|
|
//! @brief PImageLoaderJpeg constructor.
|
|
PImageLoaderJpeg::PImageLoaderJpeg(void)
|
|
: PImageLoader("JPG")
|
|
{
|
|
}
|
|
|
|
//! @brief PImageLoaderJpeg destructor.
|
|
PImageLoaderJpeg::~PImageLoaderJpeg(void)
|
|
{
|
|
}
|
|
|
|
//! @brief Loads file into data.
|
|
//! @param file File to load data from.
|
|
//! @param width Set to the width of image.
|
|
//! @param height Set to the height of image.
|
|
//! @param alpha Set to wheter image has alpha channel.
|
|
//! @return Pointer to data on success, else 0.
|
|
uchar*
|
|
PImageLoaderJpeg::load(const std::string &file, uint &width, uint &height,
|
|
bool &alpha, bool &use_alpha)
|
|
{
|
|
FILE *fp;
|
|
|
|
fp= fopen(file.c_str(), "rb");
|
|
if (! fp) {
|
|
cerr << " *** WARNING: unable to open " << file << " for reading!" << endl;
|
|
return 0;
|
|
}
|
|
|
|
struct jpeg_decompress_struct cinfo;
|
|
struct jpeg_error_mgr jerr;
|
|
|
|
cinfo.err = jpeg_std_error(&jerr);
|
|
jpeg_create_decompress(&cinfo);
|
|
|
|
jpeg_stdio_src(&cinfo, fp);
|
|
|
|
// Read jpeg header.
|
|
jpeg_read_header(&cinfo, TRUE);
|
|
|
|
// Make sure we get data in 24bit RGB.
|
|
if (cinfo.out_color_space != JCS_RGB)
|
|
cinfo.out_color_space = JCS_RGB;
|
|
|
|
jpeg_start_decompress(&cinfo);
|
|
|
|
uint channels;
|
|
uint rowbytes;
|
|
|
|
width = cinfo.output_width;
|
|
height = cinfo.output_height;
|
|
channels = cinfo.output_components;
|
|
rowbytes = width * channels;
|
|
|
|
// Allocate image data.
|
|
uchar *data = new uchar[width * height * channels];
|
|
|
|
// Read image.
|
|
JSAMPROW row;
|
|
for (uint i = 0; i < height; ++i) {
|
|
row = data + i * rowbytes;
|
|
jpeg_read_scanlines(&cinfo, &row, 1);
|
|
}
|
|
|
|
// Clean up.
|
|
jpeg_finish_decompress(&cinfo);
|
|
jpeg_destroy_decompress(&cinfo);
|
|
|
|
fclose(fp);
|
|
|
|
alpha = false; // Jpeg doesn't support alpha.
|
|
use_alpha = false; // Jpeg doesn't support alpha.
|
|
|
|
return data;
|
|
}
|
|
|
|
#endif // HAVE_IMAGE_JPEG
|