390 lines
12 KiB
C++
390 lines
12 KiB
C++
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/*M///////////////////////////////////////////////////////////////////////////////////////
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//
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// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
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//
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// By downloading, copying, installing or using the software you agree to this license.
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// If you do not agree to this license, do not download, install,
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// copy or use the software.
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//
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//
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// License Agreement
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// For Open Source Computer Vision Library
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//
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// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
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// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
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// Third party copyrights are property of their respective owners.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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//
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// * Redistribution's of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// * Redistribution's in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// * The name of the copyright holders may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// This software is provided by the copyright holders and contributors "as is" and
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// any express or implied warranties, including, but not limited to, the implied
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// warranties of merchantability and fitness for a particular purpose are disclaimed.
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// In no event shall the Intel Corporation or contributors be liable for any direct,
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// indirect, incidental, special, exemplary, or consequential damages
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// (including, but not limited to, procurement of substitute goods or services;
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// loss of use, data, or profits; or business interruption) however caused
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// and on any theory of liability, whether in contract, strict liability,
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// or tort (including negligence or otherwise) arising in any way out of
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// the use of this software, even if advised of the possibility of such damage.
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//
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//M*/
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#include "precomp.hpp"
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#ifdef HAVE_PNG
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/****************************************************************************************\
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This part of the file implements PNG codec on base of libpng library,
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in particular, this code is based on example.c from libpng
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(see otherlibs/_graphics/readme.txt for copyright notice)
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and png2bmp sample from libpng distribution (Copyright (C) 1999-2001 MIYASAKA Masaru)
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\****************************************************************************************/
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#ifdef HAVE_LIBPNG_PNG_H
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#include <libpng/png.h>
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#else
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#include <png.h>
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#endif
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#include "grfmt_png.hpp"
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namespace cv
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{
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/////////////////////// PngDecoder ///////////////////
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PngDecoder::PngDecoder()
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{
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m_signature = "\x89\x50\x4e\x47\xd\xa\x1a\xa";
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m_color_type = 0;
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m_png_ptr = 0;
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m_info_ptr = m_end_info = 0;
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m_f = 0;
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m_buf_supported = true;
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m_buf_pos = 0;
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}
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PngDecoder::~PngDecoder()
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{
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close();
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}
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ImageDecoder PngDecoder::newDecoder() const
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{
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return new PngDecoder;
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}
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void PngDecoder::close()
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{
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if( m_f )
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{
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fclose( m_f );
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m_f = 0;
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}
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if( m_png_ptr )
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{
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png_structp png_ptr = (png_structp)m_png_ptr;
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png_infop info_ptr = (png_infop)m_info_ptr;
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png_infop end_info = (png_infop)m_end_info;
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png_destroy_read_struct( &png_ptr, &info_ptr, &end_info );
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m_png_ptr = m_info_ptr = m_end_info = 0;
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}
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}
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void PngDecoder::readDataFromBuf( void* _png_ptr, uchar* dst, size_t size )
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{
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png_structp png_ptr = (png_structp)_png_ptr;
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PngDecoder* decoder = (PngDecoder*)(png_ptr->io_ptr);
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CV_Assert( decoder );
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const Mat& buf = decoder->m_buf;
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if( decoder->m_buf_pos + size > buf.cols*buf.rows*buf.elemSize() )
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{
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png_error(png_ptr, "PNG input buffer is incomplete");
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return;
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}
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memcpy( dst, &decoder->m_buf.data[decoder->m_buf_pos], size );
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decoder->m_buf_pos += size;
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}
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bool PngDecoder::readHeader()
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{
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bool result = false;
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close();
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png_structp png_ptr = png_create_read_struct( PNG_LIBPNG_VER_STRING, 0, 0, 0 );
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if( png_ptr )
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{
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png_infop info_ptr = png_create_info_struct( png_ptr );
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png_infop end_info = png_create_info_struct( png_ptr );
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m_png_ptr = png_ptr;
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m_info_ptr = info_ptr;
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m_end_info = end_info;
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m_buf_pos = 0;
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if( info_ptr && end_info )
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{
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if( setjmp( png_ptr->jmpbuf ) == 0 )
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{
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if( !m_buf.empty() )
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png_set_read_fn(png_ptr, this, (png_rw_ptr)readDataFromBuf );
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else
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{
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m_f = fopen( m_filename.c_str(), "rb" );
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if( m_f )
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png_init_io( png_ptr, m_f );
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}
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if( !m_buf.empty() || m_f )
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{
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png_uint_32 width, height;
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int bit_depth, color_type;
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png_read_info( png_ptr, info_ptr );
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png_get_IHDR( png_ptr, info_ptr, &width, &height,
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&bit_depth, &color_type, 0, 0, 0 );
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m_width = (int)width;
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m_height = (int)height;
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m_color_type = color_type;
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m_bit_depth = bit_depth;
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if( bit_depth <= 8 || bit_depth == 16 )
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{
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m_type = color_type == PNG_COLOR_TYPE_RGB ||
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color_type == PNG_COLOR_TYPE_RGB_ALPHA ||
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color_type == PNG_COLOR_TYPE_PALETTE ? CV_8UC3 : CV_8UC1;
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if( bit_depth == 16 )
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m_type = CV_MAKETYPE(CV_16U, CV_MAT_CN(m_type));
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result = true;
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}
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}
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}
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}
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}
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if( !result )
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close();
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return result;
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}
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bool PngDecoder::readData( Mat& img )
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{
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bool result = false;
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AutoBuffer<uchar*> _buffer(m_height);
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uchar** buffer = _buffer;
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int color = img.channels() > 1;
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uchar* data = img.data;
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int step = img.step;
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if( m_png_ptr && m_info_ptr && m_end_info && m_width && m_height )
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{
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png_structp png_ptr = (png_structp)m_png_ptr;
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png_infop info_ptr = (png_infop)m_info_ptr;
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png_infop end_info = (png_infop)m_end_info;
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if( setjmp(png_ptr->jmpbuf) == 0 )
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{
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int y;
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if( img.depth() == CV_8U && m_bit_depth == 16 )
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png_set_strip_16( png_ptr );
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else if( !isBigEndian() )
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png_set_swap( png_ptr );
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/* observation: png_read_image() writes 400 bytes beyond
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* end of data when reading a 400x118 color png
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* "mpplus_sand.png". OpenCV crashes even with demo
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* programs. Looking at the loaded image I'd say we get 4
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* bytes per pixel instead of 3 bytes per pixel. Test
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* indicate that it is a good idea to always ask for
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* stripping alpha.. 18.11.2004 Axel Walthelm
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*/
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png_set_strip_alpha( png_ptr );
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if( m_color_type == PNG_COLOR_TYPE_PALETTE )
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png_set_palette_to_rgb( png_ptr );
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if( m_color_type == PNG_COLOR_TYPE_GRAY && m_bit_depth < 8 )
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png_set_gray_1_2_4_to_8( png_ptr );
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if( CV_MAT_CN(m_type) > 1 && color )
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png_set_bgr( png_ptr ); // convert RGB to BGR
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else if( color )
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png_set_gray_to_rgb( png_ptr ); // Gray->RGB
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else
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png_set_rgb_to_gray( png_ptr, 1, -1, -1 ); // RGB->Gray
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png_read_update_info( png_ptr, info_ptr );
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for( y = 0; y < m_height; y++ )
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buffer[y] = data + y*step;
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png_read_image( png_ptr, buffer );
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png_read_end( png_ptr, end_info );
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result = true;
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}
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}
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close();
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return result;
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}
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/////////////////////// PngEncoder ///////////////////
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PngEncoder::PngEncoder()
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{
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m_description = "Portable Network Graphics files (*.png)";
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m_buf_supported = true;
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}
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PngEncoder::~PngEncoder()
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{
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}
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bool PngEncoder::isFormatSupported( int depth ) const
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{
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return depth == CV_8U || depth == CV_16U;
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}
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ImageEncoder PngEncoder::newEncoder() const
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{
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return new PngEncoder;
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}
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void PngEncoder::writeDataToBuf(void* _png_ptr, uchar* src, size_t size)
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{
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if( size == 0 )
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return;
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png_structp png_ptr = (png_structp)_png_ptr;
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PngEncoder* encoder = (PngEncoder*)(png_ptr->io_ptr);
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CV_Assert( encoder && encoder->m_buf );
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size_t cursz = encoder->m_buf->size();
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encoder->m_buf->resize(cursz + size);
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memcpy( &(*encoder->m_buf)[cursz], src, size );
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}
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void PngEncoder::flushBuf(void*)
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{
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}
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bool PngEncoder::write( const Mat& img, const vector<int>& params )
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{
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int compression_level = 0;
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for( size_t i = 0; i < params.size(); i += 2 )
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{
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if( params[i] == CV_IMWRITE_PNG_COMPRESSION )
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{
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compression_level = params[i+1];
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compression_level = MIN(MAX(compression_level, 0), MAX_MEM_LEVEL);
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}
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}
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png_structp png_ptr = png_create_write_struct( PNG_LIBPNG_VER_STRING, 0, 0, 0 );
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png_infop info_ptr = 0;
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FILE* f = 0;
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int y, width = img.cols, height = img.rows;
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int depth = img.depth(), channels = img.channels();
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bool result = false;
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AutoBuffer<uchar*> buffer;
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if( depth != CV_8U && depth != CV_16U )
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return false;
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if( png_ptr )
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{
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info_ptr = png_create_info_struct( png_ptr );
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if( info_ptr )
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{
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if( setjmp( png_ptr->jmpbuf ) == 0 )
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{
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if( m_buf )
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{
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png_set_write_fn(png_ptr, this,
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(png_rw_ptr)writeDataToBuf, (png_flush_ptr)flushBuf);
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}
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else
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{
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f = fopen( m_filename.c_str(), "wb" );
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if( f )
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png_init_io( png_ptr, f );
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}
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if( m_buf || f )
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{
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if( compression_level > 0 )
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{
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png_set_compression_mem_level( png_ptr, compression_level );
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}
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else
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{
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// tune parameters for speed
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// (see http://wiki.linuxquestions.org/wiki/Libpng)
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png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_FILTER_SUB);
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png_set_compression_level(png_ptr, Z_BEST_SPEED);
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}
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png_set_compression_strategy(png_ptr, Z_HUFFMAN_ONLY);
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png_set_IHDR( png_ptr, info_ptr, width, height, depth == CV_8U ? 8 : 16,
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channels == 1 ? PNG_COLOR_TYPE_GRAY :
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channels == 3 ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGBA,
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PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
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PNG_FILTER_TYPE_DEFAULT );
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png_write_info( png_ptr, info_ptr );
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png_set_bgr( png_ptr );
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if( !isBigEndian() )
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png_set_swap( png_ptr );
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buffer.allocate(height);
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for( y = 0; y < height; y++ )
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buffer[y] = img.data + y*img.step;
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png_write_image( png_ptr, buffer );
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png_write_end( png_ptr, info_ptr );
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result = true;
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}
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}
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}
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}
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png_destroy_write_struct( &png_ptr, &info_ptr );
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if(f) fclose( f );
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* End of file. */
|