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/*
Copyright 2005-2007 Adobe Systems Incorporated
Use, modification and distribution are subject to the Boost Software License,
Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt).
See http://stlab.adobe.com/gil for most recent version including documentation.
*/
/*************************************************************************************************/
#ifndef GIL_PNG_IO_PRIVATE_H
#define GIL_PNG_IO_PRIVATE_H
/// \file
/// \brief Internal support for reading and writing PNG files
/// \author Hailin Jin and Lubomir Bourdev \n
/// Adobe Systems Incorporated
/// \date 2005-2007 \n Last updated August 14, 2007
#include <algorithm>
#include <vector>
#include <boost/static_assert.hpp>
#include "../../gil_all.hpp"
#include "io_error.hpp"
#include <png.h>
namespace boost { namespace gil {
namespace detail {
static const std::size_t PNG_BYTES_TO_CHECK = 4;
// lbourdev: These can be greatly simplified, for example:
template <typename Cs> struct png_color_type {BOOST_STATIC_CONSTANT(int,color_type=0);};
template<> struct png_color_type<gray_t> { BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_GRAY); };
template<> struct png_color_type<rgb_t> { BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_RGB); };
template<> struct png_color_type<rgba_t> { BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_RGBA); };
template <typename Channel,typename ColorSpace> struct png_is_supported {BOOST_STATIC_CONSTANT(bool,value=false);};
template <> struct png_is_supported<bits8,gray_t> {BOOST_STATIC_CONSTANT(bool,value=true);};
template <> struct png_is_supported<bits8,rgb_t> {BOOST_STATIC_CONSTANT(bool,value=true);};
template <> struct png_is_supported<bits8,rgba_t> {BOOST_STATIC_CONSTANT(bool,value=true);};
template <> struct png_is_supported<bits16,gray_t> {BOOST_STATIC_CONSTANT(bool,value=true);};
template <> struct png_is_supported<bits16,rgb_t> {BOOST_STATIC_CONSTANT(bool,value=true);};
template <> struct png_is_supported<bits16,rgba_t> {BOOST_STATIC_CONSTANT(bool,value=true);};
template <typename Channel> struct png_bit_depth {BOOST_STATIC_CONSTANT(int,bit_depth=sizeof(Channel)*8);};
template <typename Channel,typename ColorSpace>
struct png_read_support_private {
BOOST_STATIC_CONSTANT(bool,is_supported=false);
BOOST_STATIC_CONSTANT(int,bit_depth=0);
BOOST_STATIC_CONSTANT(int,color_type=0);
};
template <>
struct png_read_support_private<bits8,gray_t> {
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(int,bit_depth=8);
BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_GRAY);
};
template <>
struct png_read_support_private<bits8,rgb_t> {
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(int,bit_depth=8);
BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_RGB);
};
template <>
struct png_read_support_private<bits8,rgba_t> {
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(int,bit_depth=8);
BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_RGBA);
};
template <>
struct png_read_support_private<bits16,gray_t> {
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(int,bit_depth=16);
BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_GRAY);
};
template <>
struct png_read_support_private<bits16,rgb_t> {
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(int,bit_depth=16);
BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_RGB);
};
template <>
struct png_read_support_private<bits16,rgba_t> {
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(int,bit_depth=16);
BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_RGBA);
};
template <typename Channel,typename ColorSpace>
struct png_write_support_private {
BOOST_STATIC_CONSTANT(bool,is_supported=false);
BOOST_STATIC_CONSTANT(int,bit_depth=0);
BOOST_STATIC_CONSTANT(int,color_type=0);
};
template <>
struct png_write_support_private<bits8,gray_t> {
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(int,bit_depth=8);
BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_GRAY);
};
template <>
struct png_write_support_private<bits8,rgb_t> {
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(int,bit_depth=8);
BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_RGB);
};
template <>
struct png_write_support_private<bits8,rgba_t> {
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(int,bit_depth=8);
BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_RGBA);
};
template <>
struct png_write_support_private<bits16,gray_t> {
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(int,bit_depth=16);
BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_GRAY);
};
template <>
struct png_write_support_private<bits16,rgb_t> {
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(int,bit_depth=16);
BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_RGB);
};
template <>
struct png_write_support_private<bits16,rgba_t> {
BOOST_STATIC_CONSTANT(bool,is_supported=true);
BOOST_STATIC_CONSTANT(int,bit_depth=16);
BOOST_STATIC_CONSTANT(int,color_type=PNG_COLOR_TYPE_RGBA);
};
class png_reader : public file_mgr {
protected:
png_structp _png_ptr;
png_infop _info_ptr;
void init() {
char buf[PNG_BYTES_TO_CHECK];
// read in some of the signature bytes
io_error_if(fread(buf, 1, PNG_BYTES_TO_CHECK, get()) != detail::PNG_BYTES_TO_CHECK,
"png_check_validity: fail to read file");
// compare the first PNG_BYTES_TO_CHECK bytes of the signature.
io_error_if(png_sig_cmp((png_bytep)buf, (png_size_t)0, detail::PNG_BYTES_TO_CHECK)!=0,
"png_check_validity: invalid png file");
_png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
io_error_if(_png_ptr==NULL,"png_get_file_size: fail to call png_create_write_struct()");
// allocate/initialize the image information data
_info_ptr = png_create_info_struct(_png_ptr);
if (_info_ptr == NULL) {
png_destroy_read_struct(&_png_ptr,NULL,NULL);
io_error("png_get_file_size: fail to call png_create_info_struct()");
}
if (setjmp(png_jmpbuf(_png_ptr))) {
//free all of the memory associated with the png_ptr and info_ptr
png_destroy_read_struct(&_png_ptr, &_info_ptr, NULL);
io_error("png_get_file_size: fail to call setjmp()");
}
png_init_io(_png_ptr, get());
png_set_sig_bytes(_png_ptr,PNG_BYTES_TO_CHECK);
png_read_info(_png_ptr, _info_ptr);
if (little_endian() && png_get_bit_depth(_png_ptr,_info_ptr)>8)
png_set_swap(_png_ptr);
}
public:
png_reader(FILE* file ) : file_mgr(file) { init(); }
png_reader(const char* filename) : file_mgr(filename, "rb") { init(); }
~png_reader() {
png_destroy_read_struct(&_png_ptr,&_info_ptr,NULL);
}
point2<std::ptrdiff_t> get_dimensions() {
return point2<std::ptrdiff_t>(png_get_image_width(_png_ptr,_info_ptr),
png_get_image_height(_png_ptr,_info_ptr));
}
template <typename View>
void apply(const View& view) {
png_uint_32 width, height;
int bit_depth, color_type, interlace_type;
png_get_IHDR(_png_ptr, _info_ptr,
&width, &height,&bit_depth,&color_type,&interlace_type,
NULL, NULL);
io_error_if(((png_uint_32)view.width()!=width || (png_uint_32)view.height()!= height),
"png_read_view: input view size does not match PNG file size");
if(png_read_support_private<typename channel_type<View>::type,
typename color_space_type<View>::type>::bit_depth!=bit_depth ||
png_read_support_private<typename channel_type<View>::type,
typename color_space_type<View>::type>::color_type!=color_type)
io_error("png_read_view: input view type is incompatible with the image type");
std::vector<pixel<typename channel_type<View>::type,
layout<typename color_space_type<View>::type> > > row(width);
for(png_uint_32 y=0;y<height;++y) {
png_read_row(_png_ptr,(png_bytep)&row.front(),NULL);
std::copy(row.begin(),row.end(),view.row_begin(y));
}
png_read_end(_png_ptr,NULL);
}
template <typename Image>
void read_image(Image& im) {
im.recreate(get_dimensions());
apply(view(im));
}
};
// This code will be simplified...
template <typename CC>
class png_reader_color_convert : public png_reader {
private:
CC _cc;
public:
png_reader_color_convert(FILE* file ,CC cc_in) : png_reader(file),_cc(cc_in) {}
png_reader_color_convert(FILE* file ) : png_reader(file) {}
png_reader_color_convert(const char* filename,CC cc_in) : png_reader(filename),_cc(cc_in) {}
png_reader_color_convert(const char* filename) : png_reader(filename) {}
template <typename View>
void apply(const View& view) {
png_uint_32 width, height;
int bit_depth, color_type, interlace_type;
png_get_IHDR(_png_ptr, _info_ptr,
&width, &height,&bit_depth,&color_type,&interlace_type,
int_p_NULL, int_p_NULL);
io_error_if(((png_uint_32)view.width()!=width || (png_uint_32)view.height()!= height),
"png_reader_color_convert::apply(): input view size does not match PNG file size");
switch (color_type) {
case PNG_COLOR_TYPE_GRAY:
switch (bit_depth) {
case 8: {
std::vector<gray8_pixel_t> row(width);
for(png_uint_32 y=0;y<height;++y) {
png_read_row(_png_ptr,(png_bytep)&row.front(),NULL);
std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<gray8_ref_t,typename View::value_type,CC>(_cc));
}
break;
}
case 16: {
std::vector<gray16_pixel_t> row(width);
for(png_uint_32 y=0;y<height;++y) {
png_read_row(_png_ptr,(png_bytep)&row.front(),NULL);
std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<gray16_ref_t,typename View::value_type,CC>(_cc));
}
break;
}
default: io_error("png_reader_color_convert::apply(): unknown combination of color type and bit depth");
}
break;
case PNG_COLOR_TYPE_RGB:
switch (bit_depth) {
case 8: {
std::vector<rgb8_pixel_t> row(width);
for(png_uint_32 y=0;y<height;++y) {
png_read_row(_png_ptr,(png_bytep)&row.front(),NULL);
std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<rgb8_ref_t,typename View::value_type,CC>(_cc));
}
break;
}
case 16: {
std::vector<rgb16_pixel_t> row(width);
for(png_uint_32 y=0;y<height;++y) {
png_read_row(_png_ptr,(png_bytep)&row.front(),NULL);
std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<rgb16_ref_t,typename View::value_type,CC>(_cc));
}
break;
}
default: io_error("png_reader_color_convert::apply(): unknown combination of color type and bit depth");
}
break;
case PNG_COLOR_TYPE_RGBA:
switch (bit_depth) {
case 8: {
std::vector<rgba8_pixel_t> row(width);
for(png_uint_32 y=0;y<height;++y) {
png_read_row(_png_ptr,(png_bytep)&row.front(),NULL);
std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<rgba8_ref_t,typename View::value_type,CC>(_cc));
}
break;
}
case 16: {
std::vector<rgba16_pixel_t> row(width);
for(png_uint_32 y=0;y<height;++y) {
png_read_row(_png_ptr,(png_bytep)&row.front(),NULL);
std::transform(row.begin(),row.end(),view.row_begin(y),color_convert_deref_fn<rgba16_ref_t,typename View::value_type,CC>(_cc));
}
break;
}
default: io_error("png_reader_color_convert::apply(): unknown combination of color type and bit depth");
}
break;
default: io_error("png_reader_color_convert::apply(): unknown color type");
}
png_read_end(_png_ptr,NULL);
}
template <typename Image>
void read_image(Image& im) {
im.recreate(get_dimensions());
apply(view(im));
}
};
class png_writer : public file_mgr {
protected:
png_structp _png_ptr;
png_infop _info_ptr;
void init() {
_png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
io_error_if(!_png_ptr,"png_write_initialize: fail to call png_create_write_struct()");
_info_ptr = png_create_info_struct(_png_ptr);
if (!_info_ptr) {
png_destroy_write_struct(&_png_ptr,NULL);
io_error("png_write_initialize: fail to call png_create_info_struct()");
}
if (setjmp(png_jmpbuf(_png_ptr))) {
png_destroy_write_struct(&_png_ptr, &_info_ptr);
io_error("png_write_initialize: fail to call setjmp(png_jmpbuf())");
}
png_init_io(_png_ptr,get());
}
public:
png_writer(FILE* file ) : file_mgr(file) { init(); }
png_writer(const char* filename) : file_mgr(filename, "wb") { init(); }
~png_writer() {
png_destroy_write_struct(&_png_ptr,&_info_ptr);
}
template <typename View>
void apply(const View& view) {
png_set_IHDR(_png_ptr, _info_ptr, view.width(), view.height(),
png_write_support_private<typename channel_type<View>::type,
typename color_space_type<View>::type>::bit_depth,
png_write_support_private<typename channel_type<View>::type,
typename color_space_type<View>::type>::color_type,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,PNG_FILTER_TYPE_DEFAULT);
png_write_info(_png_ptr,_info_ptr);
if (little_endian() &&
png_write_support_private<typename channel_type<View>::type,
typename color_space_type<View>::type>::bit_depth>8)
png_set_swap(_png_ptr);
std::vector<pixel<typename channel_type<View>::type,
layout<typename color_space_type<View>::type> > > row(view.width());
for(int y=0;y<view.height();++y) {
std::copy(view.row_begin(y),view.row_end(y),row.begin());
png_write_row(_png_ptr,(png_bytep)&row.front());
}
png_write_end(_png_ptr,_info_ptr);
}
};
} // namespace detail
} } // namespace boost::gil
#endif