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/*
* Copyright (C) 2005 Maarten de Boer <maarten@resorama.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*/
#include "Loader.hxx"
#include <png.h>
#include <jpeglib.h>
void JpgLoader::Load(const std::string& filename,RGB& target,int x,int y)
{
FILE *infile = fopen(filename.c_str(), "rb");
if (!infile)
throw LoaderException(std::string("failed to open ")+filename);
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo, infile);
jpeg_read_header(&cinfo, TRUE);
jpeg_start_decompress(&cinfo);
width = cinfo.output_width;
height = cinfo.output_height;
unsigned char *line =
(unsigned char *) malloc(width *
cinfo.output_components);
int k = 0;
while (cinfo.output_scanline < height) {
unsigned char* ptr = target.Data() + (y+k)*target.Width()*3 + x*3;
jpeg_read_scanlines(&cinfo, &line, 1);
unsigned char *jpeg_ptr = line;
for (unsigned int i = 0; i < width; i++) {
*ptr++ = *jpeg_ptr++;
*ptr++ = *jpeg_ptr++;
*ptr++ = *jpeg_ptr++;
}
k++;
}
free(line);
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
fclose(infile);
}
void JpgLoader::Load(const std::string& filename,RGBA& target,int x,int y)
{
FILE *infile = fopen(filename.c_str(), "rb");
if (!infile)
throw LoaderException(std::string("failed to open ")+filename);
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo, infile);
jpeg_read_header(&cinfo, TRUE);
jpeg_start_decompress(&cinfo);
width = cinfo.output_width;
height = cinfo.output_height;
unsigned char *line =
(unsigned char *) malloc(width *
cinfo.output_components);
int k = 0;
while (cinfo.output_scanline < height) {
unsigned char* ptr = target.Data() + (y+k)*target.Width()*4 + x*4;
jpeg_read_scanlines(&cinfo, &line, 1);
unsigned char *jpeg_ptr = line;
for (unsigned int i = 0; i < width; i++) {
*ptr++ = *jpeg_ptr++;
*ptr++ = *jpeg_ptr++;
*ptr++ = *jpeg_ptr++;
*ptr++ = 255;
}
k++;
}
free(line);
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
fclose(infile);
}
void JpgLoader::Merge(const std::string& filename,RGBA& target,int x,int y)
{
FILE* infile = fopen(filename.c_str(), "rb");
if (!infile)
throw LoaderException(std::string("failed to open ")+filename);
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo, infile);
jpeg_read_header(&cinfo, TRUE);
jpeg_start_decompress(&cinfo);
unsigned char *line =
(unsigned char *) malloc(cinfo.output_width *
cinfo.output_components);
int k = 0;
while (cinfo.output_scanline < cinfo.output_height) {
unsigned char* ptr = target.Data() + (y+k)*target.Width()*4 + x*4;
jpeg_read_scanlines(&cinfo, &line, 1);
unsigned char *jpeg_ptr = line;
for (unsigned int i = 0; i < cinfo.output_width; i++) {
if (ptr[0] == 255 &&
ptr[1] == 255 && ptr[2] == 255 && ptr[3] == 255) {
*ptr++ = *jpeg_ptr++;
*ptr++ = *jpeg_ptr++;
*ptr++ = *jpeg_ptr++;
ptr++;
} else {
ptr += 4;
jpeg_ptr += 3;
}
}
k++;
}
free(line);
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
fclose(infile);
}
void PngLoader::Load(const std::string& filename,RGBA& target)
{
png_byte header[8];
int number = 8;
FILE *fp = fopen(filename.c_str(), "rb");
if (!fp) {
throw LoaderException(std::string("cannot open "+filename));
}
fread(header, 1, number, fp);
int is_png = !png_sig_cmp(header, 0, number);
if (!is_png) {
fclose(fp);
throw LoaderException(filename+" is not a png");
}
png_structp png_ptr = png_create_read_struct
(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
{
fclose(fp);
throw LoaderException("png_create_read_struct failed");
}
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr,
(png_infopp) NULL, (png_infopp) NULL);
fclose(fp);
throw LoaderException("png_create_info_struct failed");
}
png_infop end_info = png_create_info_struct(png_ptr);
if (!end_info) {
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
throw LoaderException("png_create_info_struct (end_info) failed");
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
fclose(fp);
throw LoaderException("png_create_info_struct (end_info) failed");
}
png_init_io(png_ptr, fp);
png_set_sig_bytes(png_ptr, number);
png_uint_32 width, height;
int bit_depth, color_type, interlace_type;
png_read_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
&color_type, &interlace_type, int_p_NULL, int_p_NULL);
int row_bytes = png_get_rowbytes(png_ptr, info_ptr);
png_bytep *row_pointers =
(png_bytep *) png_malloc(png_ptr, height * sizeof(png_bytep));
target.Alloc(width,height);
png_bytep ptr = target.Data();
for (unsigned int i = 0; i < height; i++) {
row_pointers[i] = ptr;
ptr += row_bytes;
}
png_read_image(png_ptr, row_pointers);
png_read_end(png_ptr, NULL);
png_free(png_ptr, row_pointers);
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
fclose(fp);
}
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