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/*
render/pngfile.cc
This file is part of the Osirion project and is distributed under
the terms of the GNU General Public License version 2
*/
/*
Notes:
http://www.zarb.org/~gc/html/libpng.html
*/
#include "png.h"
#include <string.h>
#include <iostream>
#include "filesystem/filesystem.h"
#include "render/pngfile.h"
#include "sys/sys.h"
namespace render
{
Image *PNG::load(const char *filename)
{
Image *image = 0;
if (!filename)
return 0;
filesystem::File *png_file = filesystem::open(filename);
if (!png_file) {
//con_warn << "Could not open " << filename << std::endl;
return 0;
}
png_byte header[8];
memset(header, 0, sizeof(header));
if (!png_file->read(header, 8)) {
con_warn << "Error reading " << filename << std::endl;
filesystem::close(png_file);
return 0;
}
if (png_sig_cmp(header, 0, 8)) {
con_warn << "Error reading " << filename << ": not a PNG file!" << std::endl;
filesystem::close(png_file);
return 0;
}
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
con_warn << "Error reading " << filename << ": png_create_read_struct failed!" << std::endl;
filesystem::close(png_file);
return 0;
}
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
con_warn << "Error reading " << filename << ": png_create_info_struct failed!" << std::endl;
filesystem::close(png_file);
png_destroy_read_struct(&png_ptr, 0, 0);
return 0;
}
if (setjmp(png_jmpbuf(png_ptr))) {
con_warn << "Error reading " << filename << ": error during init_io!" << std::endl;
filesystem::close(png_file);
png_destroy_read_struct(&png_ptr, &info_ptr, 0);
return 0;
}
/* read the PNG header */
png_init_io(png_ptr, png_file->handle());
png_set_sig_bytes(png_ptr, 8);
png_read_info(png_ptr, info_ptr);
int png_width = info_ptr->width;
int png_height = info_ptr->height;
//int png_color_type = info_ptr->color_type;
int png_depth = info_ptr->bit_depth;
//int number_of_passes = png_set_interlace_handling(png_ptr);
png_set_interlace_handling(png_ptr);
png_read_update_info(png_ptr, info_ptr);
if (png_depth != 8) {
con_warn << "Error reading " << filename << ": bits per channel must be 8!" << std::endl;
filesystem::close(png_file);
png_destroy_read_struct(&png_ptr, &info_ptr, 0);
return 0;
}
unsigned int channels = info_ptr->rowbytes / png_width;
image = new Image(png_width, png_height, channels);
/* read image data */
if (setjmp(png_jmpbuf(png_ptr))) {
con_warn << "Error reading " << filename << std::endl;
filesystem::close(png_file);
delete image;
png_destroy_read_struct(&png_ptr, &info_ptr, 0);
return 0;
}
png_bytep row_pointers[png_height];
for (size_t i = 0; i < (size_t)png_height; i++)
row_pointers[i] = (png_bytep)(*image)[i * info_ptr->rowbytes];
// read pixel data
png_read_image(png_ptr, row_pointers);
filesystem::close(png_file);
png_destroy_read_struct(&png_ptr, &info_ptr, 0);
con_debug << " " << filename << " " << image->width() << "x" << image->height() << "x" << image->bpp() << "bpp" << std::endl;
return image;
}
void PNG::save(const char *filename, Image & image)
{
FILE *png_file = fopen(filename, "wb");
if (!png_file) {
con_warn << "Could not write " << filename << std::endl;
return;
}
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
fclose(png_file);
con_warn << "Error writing " << filename << ": png_create_write_struct failed!" << std::endl;
return;
}
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
con_warn << "Error writing " << filename << ": png_create_info_struct failed!" << std::endl;
fclose(png_file);
png_destroy_write_struct(&png_ptr, 0);
return;
}
if (setjmp(png_jmpbuf(png_ptr))) {
con_warn << "Error reading " << filename << ": error during init_io!" << std::endl;
fclose(png_file);
png_destroy_write_struct(&png_ptr, &info_ptr);
return;
}
png_init_io(png_ptr, png_file);
/* write header */
if (setjmp(png_jmpbuf(png_ptr))) {
con_warn << "Error writing " << filename << ": error writing header!" << std::endl;
fclose(png_file);
png_destroy_write_struct(&png_ptr, &info_ptr);
return;
}
png_set_IHDR(png_ptr, info_ptr, image.width(), image.height(), 8, PNG_COLOR_TYPE_RGB,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
png_write_info(png_ptr, info_ptr);
/* write image data */
if (setjmp(png_jmpbuf(png_ptr))) {
con_warn << "Error writing " << filename << ": error writing header!" << std::endl;
fclose(png_file);
png_destroy_write_struct(&png_ptr, &info_ptr);
return;
}
png_bytep row_pointers[image.height()];
for (size_t i = 0; i < image.height(); i++)
row_pointers[i] = (png_bytep) image[i * image.width() * image.channels()];
png_write_image(png_ptr, row_pointers);
/* end write */
if (setjmp(png_jmpbuf(png_ptr))) {
con_warn << "Error writing " << filename << std::endl;
fclose(png_file);
png_destroy_write_struct(&png_ptr, &info_ptr);
return;
}
png_write_end(png_ptr, NULL);
fclose(png_file);
png_destroy_write_struct(&png_ptr, &info_ptr);
con_print << "Wrote " << filename << std::endl;
}
}
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