+++ /dev/null
-/*M///////////////////////////////////////////////////////////////////////////////////////
-//
-// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
-//
-// By downloading, copying, installing or using the software you agree to this license.
-// If you do not agree to this license, do not download, install,
-// copy or use the software.
-//
-//
-// Intel License Agreement
-// For Open Source Computer Vision Library
-//
-// Copyright (C) 2000, Intel Corporation, all rights reserved.
-// Third party copyrights are property of their respective owners.
-//
-// Redistribution and use in source and binary forms, with or without modification,
-// are permitted provided that the following conditions are met:
-//
-// * Redistribution's of source code must retain the above copyright notice,
-// this list of conditions and the following disclaimer.
-//
-// * Redistribution's in binary form must reproduce the above copyright notice,
-// this list of conditions and the following disclaimer in the documentation
-// and/or other materials provided with the distribution.
-//
-// * The name of Intel Corporation may not be used to endorse or promote products
-// derived from this software without specific prior written permission.
-//
-// This software is provided by the copyright holders and contributors "as is" and
-// any express or implied warranties, including, but not limited to, the implied
-// warranties of merchantability and fitness for a particular purpose are disclaimed.
-// In no event shall the Intel Corporation or contributors be liable for any direct,
-// indirect, incidental, special, exemplary, or consequential damages
-// (including, but not limited to, procurement of substitute goods or services;
-// loss of use, data, or profits; or business interruption) however caused
-// and on any theory of liability, whether in contract, strict liability,
-// or tort (including negligence or otherwise) arising in any way out of
-// the use of this software, even if advised of the possibility of such damage.
-//
-//M*/
-
-#include "_highgui.h"
-
-#ifdef HAVE_PNG
-
-/****************************************************************************************\
- This part of the file implements PNG codec on base of libpng library,
- in particular, this code is based on example.c from libpng
- (see otherlibs/_graphics/readme.txt for copyright notice)
- and png2bmp sample from libpng distribution (Copyright (C) 1999-2001 MIYASAKA Masaru)
-\****************************************************************************************/
-
-#if defined WIN32 || defined HAVE_PNG_H
-#include <png.h>
-#else
-#include <libpng/png.h>
-#endif
-#include "grfmt_png.h"
-
-// PNG Filter Factory
-GrFmtPng::GrFmtPng()
-{
- m_sign_len = 8;
- m_signature = "\x89\x50\x4e\x47\xd\xa\x1a\xa";
- m_description = "Portable Network Graphics files (*.png)";
-}
-
-
-GrFmtPng::~GrFmtPng()
-{
-}
-
-
-GrFmtReader* GrFmtPng::NewReader( const char* filename )
-{
- return new GrFmtPngReader( filename );
-}
-
-
-GrFmtWriter* GrFmtPng::NewWriter( const char* filename )
-{
- return new GrFmtPngWriter( filename );
-}
-
-
-bool GrFmtPng::CheckSignature( const char* signature )
-{
- return png_check_sig( (uchar*)signature, m_sign_len ) != 0;
-}
-
-/////////////////////// GrFmtPngReader ///////////////////
-
-GrFmtPngReader::GrFmtPngReader( const char* filename ) : GrFmtReader( filename )
-{
- m_color_type = m_bit_depth = 0;
- m_png_ptr = 0;
- m_info_ptr = m_end_info = 0;
- m_f = 0;
-}
-
-
-GrFmtPngReader::~GrFmtPngReader()
-{
-}
-
-
-void GrFmtPngReader::Close()
-{
- if( m_f )
- {
- fclose( m_f );
- m_f = 0;
- }
-
- if( m_png_ptr )
- {
- png_structp png_ptr = (png_structp)m_png_ptr;
- png_infop info_ptr = (png_infop)m_info_ptr;
- png_infop end_info = (png_infop)m_end_info;
- png_destroy_read_struct( &png_ptr, &info_ptr, &end_info );
- m_png_ptr = m_info_ptr = m_end_info = 0;
- }
- GrFmtReader::Close();
-}
-
-
-bool GrFmtPngReader::ReadHeader()
-{
- bool result = false;
-
- Close();
-
- png_structp png_ptr = png_create_read_struct( PNG_LIBPNG_VER_STRING, 0, 0, 0 );
-
- if( png_ptr )
- {
- png_infop info_ptr = png_create_info_struct( png_ptr );
- png_infop end_info = png_create_info_struct( png_ptr );
-
- m_png_ptr = png_ptr;
- m_info_ptr = info_ptr;
- m_end_info = end_info;
-
- if( info_ptr && end_info )
- {
- if( setjmp( png_ptr->jmpbuf ) == 0 )
- {
- m_f = fopen( m_filename, "rb" );
- if( m_f )
- {
- png_uint_32 width, height;
- int bit_depth, color_type;
-
- png_init_io( png_ptr, m_f );
- png_read_info( png_ptr, info_ptr );
-
- png_get_IHDR( png_ptr, info_ptr, &width, &height,
- &bit_depth, &color_type, 0, 0, 0 );
-
- m_iscolor = color_type == PNG_COLOR_TYPE_RGB ||
- color_type == PNG_COLOR_TYPE_RGB_ALPHA ||
- color_type == PNG_COLOR_TYPE_PALETTE;
-
- m_width = (int)width;
- m_height = (int)height;
- m_color_type = color_type;
- m_bit_depth = bit_depth;
-
- result = true;
- }
- }
- }
- }
-
- if( !result )
- Close();
-
- return result;
-}
-
-
-bool GrFmtPngReader::ReadData( uchar* data, int step, int color )
-{
- bool result = false;
- uchar** buffer = 0;
-
- color = color > 0 || ( m_iscolor && color < 0 );
-
- if( m_png_ptr && m_info_ptr && m_end_info && m_width && m_height )
- {
- png_structp png_ptr = (png_structp)m_png_ptr;
- png_infop info_ptr = (png_infop)m_info_ptr;
- png_infop end_info = (png_infop)m_end_info;
-
- if( setjmp(png_ptr->jmpbuf) == 0 )
- {
- int y;
-
- if( m_bit_depth > 8 && !m_native_depth )
- png_set_strip_16( png_ptr );
- else if( !isBigEndian() )
- png_set_swap( png_ptr );
-
- /* observation: png_read_image() writes 400 bytes beyond
- * end of data when reading a 400x118 color png
- * "mpplus_sand.png". OpenCV crashes even with demo
- * programs. Looking at the loaded image I'd say we get 4
- * bytes per pixel instead of 3 bytes per pixel. Test
- * indicate that it is a good idea to always ask for
- * stripping alpha.. 18.11.2004 Axel Walthelm
- */
- png_set_strip_alpha( png_ptr );
-
- if( m_color_type == PNG_COLOR_TYPE_PALETTE )
- png_set_palette_to_rgb( png_ptr );
-
- if( m_color_type == PNG_COLOR_TYPE_GRAY && m_bit_depth < 8 )
- png_set_gray_1_2_4_to_8( png_ptr );
-
- if( m_iscolor && color )
- png_set_bgr( png_ptr ); // convert RGB to BGR
- else if( color )
- png_set_gray_to_rgb( png_ptr ); // Gray->RGB
- else
- png_set_rgb_to_gray( png_ptr, 1, -1, -1 ); // RGB->Gray
-
- png_read_update_info( png_ptr, info_ptr );
-
- buffer = new uchar*[m_height];
-
- for( y = 0; y < m_height; y++ )
- buffer[y] = data + y*step;
-
- png_read_image( png_ptr, buffer );
- png_read_end( png_ptr, end_info );
-
- result = true;
- }
- }
-
- Close();
- delete[] buffer;
-
- return result;
-}
-
-
-/////////////////////// GrFmtPngWriter ///////////////////
-
-
-GrFmtPngWriter::GrFmtPngWriter( const char* filename ) : GrFmtWriter( filename )
-{
-}
-
-
-GrFmtPngWriter::~GrFmtPngWriter()
-{
-}
-
-
-bool GrFmtPngWriter::IsFormatSupported( int depth )
-{
- return depth == IPL_DEPTH_8U || depth == IPL_DEPTH_16U;
-}
-
-bool GrFmtPngWriter::WriteImage( const uchar* data, int step,
- int width, int height, int depth, int channels )
-{
- png_structp png_ptr = png_create_write_struct( PNG_LIBPNG_VER_STRING, 0, 0, 0 );
- png_infop info_ptr = 0;
- FILE* f = 0;
- uchar** buffer = 0;
- int y;
- bool result = false;
-
- if( depth != IPL_DEPTH_8U && depth != IPL_DEPTH_16U )
- return false;
-
- if( png_ptr )
- {
- info_ptr = png_create_info_struct( png_ptr );
-
- if( info_ptr )
- {
- if( setjmp( png_ptr->jmpbuf ) == 0 )
- {
- f = fopen( m_filename, "wb" );
-
- if( f )
- {
- png_init_io( png_ptr, f );
-
- png_set_compression_mem_level( png_ptr, MAX_MEM_LEVEL );
-
- png_set_IHDR( png_ptr, info_ptr, width, height, depth,
- channels == 1 ? PNG_COLOR_TYPE_GRAY :
- channels == 3 ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGBA,
- PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
- PNG_FILTER_TYPE_DEFAULT );
-
- png_write_info( png_ptr, info_ptr );
-
- png_set_bgr( png_ptr );
- if( !isBigEndian() )
- png_set_swap( png_ptr );
-
- buffer = new uchar*[height];
- for( y = 0; y < height; y++ )
- buffer[y] = (uchar*)(data + y*step);
-
- png_write_image( png_ptr, buffer );
- png_write_end( png_ptr, info_ptr );
-
- delete[] buffer;
-
- result = true;
- }
- }
- }
- }
-
- png_destroy_write_struct( &png_ptr, &info_ptr );
-
- if(f) fclose( f );
-
- return result;
-}
-
-#endif
-
-/* End of file. */
-
-
projects / opencv / blobdiff