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