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/*
*
* Copyright (C) 2001-2005 Ichiro Fujinaga, Michael Droettboom, Karl MacMillan
* 2015 Christoph Dalitz
*
* 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.
*/
/*
Resolution support graciously donated by Damon Li.
*/
#ifndef mgd_png_support
#define mgd_png_support
#include "image_utilities.hpp"
#include <png.h>
#include <stdio.h>
#include <stdint.h>
// TODO: Get/Save resolution information
using namespace Gamera;
#define PNG_BYTES_TO_CHECK 8
#define METER_PER_INCH 0.0254
void PNG_info_specific(const char* filename, FILE* & fp, png_structp& png_ptr, png_infop& info_ptr, png_infop& end_info, png_uint_32& width, png_uint_32& height, int& bit_depth, int& color_type, double& x_resolution, double& y_resolution) {
fp = fopen(filename, "rb");
if (!fp)
throw std::invalid_argument("Failed to open image");
// Check if a PNG file
char buf[PNG_BYTES_TO_CHECK];
if (fread(buf, 1, PNG_BYTES_TO_CHECK, fp) != PNG_BYTES_TO_CHECK) {
fclose(fp);
throw std::runtime_error("Image file too small");
}
if (png_sig_cmp((png_byte*)buf, 0, PNG_BYTES_TO_CHECK)) {
fclose(fp);
throw std::runtime_error("Not a PNG file");
}
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
NULL, NULL);
if (!png_ptr) {
fclose(fp);
throw std::runtime_error("Could not read PNG header");
}
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 std::runtime_error("Could not read PNG info");
}
end_info = png_create_info_struct(png_ptr);
if (!end_info) {
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
fclose(fp);
throw std::runtime_error("Could not read PNG info");
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
fclose(fp);
throw std::runtime_error("error in reading PNG header");
}
png_set_sig_bytes(png_ptr, PNG_BYTES_TO_CHECK);
// Initialize IO
png_init_io(png_ptr, fp);
// Read in info
png_read_info(png_ptr, info_ptr);
int dummy;
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &dummy, &dummy, &dummy);
//Damon
x_resolution = (double)png_get_x_pixels_per_meter(png_ptr, info_ptr) * METER_PER_INCH;
y_resolution = (double)png_get_y_pixels_per_meter(png_ptr, info_ptr) * METER_PER_INCH;
//Damon: end
}
void PNG_close(FILE* fp, png_structp png_ptr, png_infop info_ptr, png_infop end_info) {
// As PNG_close() might be called when png_read_image() has not yet been
// used (premature termination), png_read_end() might crash.
// We therefore omit the call to png_read_end(), as we are not
// interested in the comment texts following the image data anyway.
//png_read_end(png_ptr, end_info);
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
fclose(fp);
}
ImageInfo* PNG_info(char* filename) {
FILE* fp;
png_structp png_ptr;
png_infop info_ptr, end_info;
png_uint_32 width, height;
int bit_depth, color_type;
double x_resolution, y_resolution;
PNG_info_specific(filename, fp, png_ptr, info_ptr, end_info, width, height, bit_depth, color_type, x_resolution, y_resolution);
ImageInfo* info = new ImageInfo();
try {
// Copy to our own ImageInfo object
info->m_nrows = height;
info->m_ncols = width;
info->m_depth = bit_depth;
info->m_x_resolution = x_resolution;
info->m_y_resolution = y_resolution;
if (color_type == PNG_COLOR_TYPE_PALETTE || color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA)
info->m_ncolors = 3;
else if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
info->m_ncolors = 1;
} catch (std::exception e) {
delete info;
throw;
}
// PNG_close(fp, png_ptr, info_ptr, end_info);
return info;
}
template<class T>
void load_PNG_simple(T& image, png_structp& png_ptr) {
typename T::row_iterator r = image.row_begin();
for (; r != image.row_end(); ++r)
png_read_row(png_ptr, (png_bytep)(&(*r)), NULL);
}
template<class T>
void load_PNG_grey16(T& image, png_structp& png_ptr) {
uint16_t* row = new uint16_t[image.ncols()];
if (byte_order_little_endian())
png_set_swap(png_ptr);
try {
typename T::row_iterator r = image.row_begin();
for (; r != image.row_end(); ++r) {
png_read_row(png_ptr, (png_bytep)row, NULL);
uint16_t* from = row;
typename T::col_iterator c = r.begin();
for (; c != r.end(); ++c, ++from) {
c.set((int)*from);
}
}
} catch (std::exception e) {
delete[] row;
throw;
}
delete[] row;
}
template<class T>
void load_PNG_onebit(T& image, png_structp& png_ptr) {
png_set_invert_mono(png_ptr);
#if PNG_LIBPNG_VER > 10399
png_set_expand_gray_1_2_4_to_8(png_ptr);
#else
png_set_gray_1_2_4_to_8(png_ptr);
#endif
png_bytep row = new png_byte[image.ncols()];
try {
typename T::row_iterator r = image.row_begin();
for (; r != image.row_end(); ++r) {
png_read_row(png_ptr, row, NULL);
png_bytep from = row;
typename T::col_iterator c = r.begin();
for (; c != r.end(); ++c, ++from) {
if (*from)
c.set(pixel_traits<OneBitPixel>::black());
else
c.set(pixel_traits<OneBitPixel>::white());
}
}
} catch (std::exception e) {
delete[] row;
throw;
}
delete[] row;
}
Image* load_PNG(const char* filename, int storage) {
FILE* fp;
png_structp png_ptr;
png_infop info_ptr, end_info;
png_uint_32 width, height;
int bit_depth, color_type;
double x_resolution, y_resolution;
PNG_info_specific(filename, fp, png_ptr, info_ptr, end_info, width, height, bit_depth, color_type, x_resolution, y_resolution);
// libpng exception handling
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
fclose(fp);
throw std::runtime_error("error in reading PNG data");
}
//Damon
double reso = (x_resolution + y_resolution) / 2.0;
//Damon: end
// if (color_type & PNG_COLOR_MASK_ALPHA)
png_set_strip_alpha(png_ptr);
if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_PALETTE ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
if (storage == RLE) {
PNG_close(fp, png_ptr, info_ptr, end_info);
throw std::runtime_error("Pixel type must be OneBit to use RLE data.");
}
if (bit_depth > 8) {
#if PNG_LIBPNG_VER >= 10504
png_set_scale_16(png_ptr);
#else
png_set_strip_16(png_ptr);
#endif
}
else if (bit_depth < 8) {
png_set_expand(png_ptr);
}
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb(png_ptr);
typedef TypeIdImageFactory<RGB, DENSE> fact;
fact::image_type* image =
fact::create(Point(0, 0), Dim(width, height));
load_PNG_simple(*image, png_ptr);
//Damon
image->resolution(reso);
//Damon: end
PNG_close(fp, png_ptr, info_ptr, end_info);
return image;
} else if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
if (bit_depth == 1) {
if (storage == DENSE) {
typedef TypeIdImageFactory<ONEBIT, DENSE> fact;
fact::image_type* image =
fact::create(Point(0, 0), Dim(width, height));
load_PNG_onebit(*image, png_ptr);
//Damon
image->resolution(reso);
//Damon: end
PNG_close(fp, png_ptr, info_ptr, end_info);
return image;
} else {
typedef TypeIdImageFactory<ONEBIT, RLE> fact;
fact::image_type* image =
fact::create(Point(0, 0), Dim(width, height));
load_PNG_onebit(*image, png_ptr);
//Damon
image->resolution(reso);
//Damon: end
PNG_close(fp, png_ptr, info_ptr, end_info);
return image;
}
} else if (bit_depth <= 8) {
if (storage == RLE) {
PNG_close(fp, png_ptr, info_ptr, end_info);
throw std::runtime_error("Pixel type must be OneBit to use RLE data.");
}
if (bit_depth < 8) {
#if PNG_LIBPNG_VER > 10399
png_set_expand_gray_1_2_4_to_8(png_ptr);
#else
png_set_gray_1_2_4_to_8(png_ptr);
#endif
}
typedef TypeIdImageFactory<GREYSCALE, DENSE> fact_type;
fact_type::image_type*
image = fact_type::create(Point(0, 0), Dim(width, height));
load_PNG_simple(*image, png_ptr);
//Damon
image->resolution(reso);
//Damon: end
PNG_close(fp, png_ptr, info_ptr, end_info);
return image;
} else if (bit_depth == 16) {
if (storage == RLE) {
PNG_close(fp, png_ptr, info_ptr, end_info);
throw std::runtime_error("Pixel type must be OneBit to use RLE data.");
}
typedef TypeIdImageFactory<GREY16, DENSE> fact_type;
fact_type::image_type*
image = fact_type::create(Point(0, 0), Dim(width, height));
load_PNG_grey16(*image, png_ptr);
//Damon
image->resolution(reso);
//Damon: end
PNG_close(fp, png_ptr, info_ptr, end_info);
return image;
}
}
PNG_close(fp, png_ptr, info_ptr, end_info);
throw std::runtime_error("PNG file is an unsupported type");
}
template<class P>
struct PNG_saver {
template<class T>
void operator()(T& image, png_structp png_ptr) {
typename T::row_iterator r = image.row_begin();
for (; r != image.row_end(); ++r)
png_write_row(png_ptr, (png_bytep)(&(*r)));
}
};
template<>
struct PNG_saver<OneBitPixel> {
template<class T>
void operator()(T& image, png_structp png_ptr) {
png_bytep row = new png_byte[image.ncols()];
try {
typename T::row_iterator r = image.row_begin();
for (; r != image.row_end(); ++r) {
png_bytep from = row;
typename T::col_iterator c = r.begin();
for (; c != r.end(); ++c, ++from) {
if (is_black(c.get()))
*from = 0;
else
*from = 255;
}
png_write_row(png_ptr, row);
}
} catch (std::exception e) {
delete[] row;
throw;
}
delete[] row;
}
};
template<>
struct PNG_saver<FloatPixel> {
template<class T>
void operator()(T& image, png_structp png_ptr) {
FloatPixel max = 0;
max = find_max(image.parent());
if (max > 0)
max = 255.0 / max;
else
max = 0;
png_bytep row = new png_byte[image.ncols()];
try {
typename T::row_iterator r = image.row_begin();
for (; r != image.row_end(); ++r) {
png_bytep from = row;
typename T::col_iterator c = r.begin();
for (; c != r.end(); ++c, ++from) {
*from = (png_byte)(*c * max);
}
png_write_row(png_ptr, row);
}
} catch (std::exception e) {
delete[] row;
throw;
}
delete[] row;
}
};
template<>
struct PNG_saver<ComplexPixel> {
template<class T>
void operator()(T& image, png_structp png_ptr) {
ComplexPixel temp = find_max(image.parent());
FloatPixel max;
if (temp.real() > 0)
max = 255.0 / temp.real();
else
max = 0;
png_bytep row = new png_byte[image.ncols()];
try {
typename T::row_iterator r = image.row_begin();
for (; r != image.row_end(); ++r) {
png_bytep from = row;
typename T::col_iterator c = r.begin();
for (; c != r.end(); ++c, ++from) {
*from = (png_byte)((*c).real() * max);
}
png_write_row(png_ptr, row);
}
} catch (std::exception e) {
delete[] row;
throw;
}
delete[] row;
}
};
template<>
struct PNG_saver<Grey16Pixel> {
template<class T>
void operator()(T& image, png_structp png_ptr) {
//png_bytep row = new png_byte[image.ncols() * 2];
uint16_t* row = new uint16_t[image.ncols()];
if (byte_order_little_endian())
png_set_swap(png_ptr);
try {
typename T::row_iterator r = image.row_begin();
for (; r != image.row_end(); ++r) {
typename T::col_iterator c = r.begin();
uint16_t* from = (uint16_t*)row;
for (; c != r.end(); ++c, ++from)
*from = (uint16_t)(*c);
png_write_row(png_ptr, (png_bytep)row);
}
} catch (std::exception e) {
delete[] row;
throw;
}
delete[] row;
}
};
template<class T>
void save_PNG(T& image, const char* filename) {
FILE* fp = fopen(filename, "wb");
if (!fp)
throw std::invalid_argument("Failed to open image");
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
fclose(fp);
throw std::runtime_error("Couldn't create PNG header");
}
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
fclose(fp);
throw std::runtime_error("Couldn't create PNG header");
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);
throw std::runtime_error("Unknown PNG error");
}
png_uint_32 width = image.ncols();
png_uint_32 height = image.nrows();
int bit_depth;
if (image.depth() == 32)
bit_depth = 16;
else if (image.depth() == 64)
bit_depth = 8;
else if (image.depth() == 128)
bit_depth = 8;
else
bit_depth = image.depth();
int color_type = (image.ncolors() == 3) ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_GRAY;
png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth, color_type,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
//Damon
png_uint_32 res_x = (png_uint_32)(image.resolution() / METER_PER_INCH);
png_uint_32 res_y = (png_uint_32)(image.resolution() / METER_PER_INCH);
int unit_type = PNG_RESOLUTION_METER;
png_set_pHYs(png_ptr, info_ptr, res_x, res_y, unit_type);
//Damon:end
png_init_io(png_ptr, fp);
png_write_info(png_ptr, info_ptr);
png_set_packing(png_ptr);
PNG_saver<typename T::value_type> saver;
saver(image, png_ptr);
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);
}
#endif
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