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43 #include "precomp.hpp"
47 /****************************************************************************************\
48 This part of the file implements PNG codec on base of libpng library,
49 in particular, this code is based on example.c from libpng
50 (see otherlibs/_graphics/readme.txt for copyright notice)
51 and png2bmp sample from libpng distribution (Copyright (C) 1999-2001 MIYASAKA Masaru)
52 \****************************************************************************************/
54 #ifndef _LFS64_LARGEFILE
55 # define _LFS64_LARGEFILE 0
57 #ifndef _FILE_OFFSET_BITS
58 # define _FILE_OFFSET_BITS 0
61 #ifdef HAVE_LIBPNG_PNG_H
62 #include <libpng/png.h>
68 #include "grfmt_png.hpp"
70 #if defined _MSC_VER && _MSC_VER >= 1200
71 // interaction between '_setjmp' and C++ object destruction is non-portable
72 #pragma warning( disable: 4611 )
75 // the following defines are a hack to avoid multiple problems with frame ponter handling and setjmp
76 // see http://gcc.gnu.org/ml/gcc/2011-10/msg00324.html for some details
77 #define mingw_getsp(...) 0
78 #define __builtin_frame_address(...) 0
83 /////////////////////// PngDecoder ///////////////////
85 PngDecoder::PngDecoder()
87 m_signature = "\x89\x50\x4e\x47\xd\xa\x1a\xa";
90 m_info_ptr = m_end_info = 0;
92 m_buf_supported = true;
97 PngDecoder::~PngDecoder()
102 ImageDecoder PngDecoder::newDecoder() const
104 return new PngDecoder;
107 void PngDecoder::close()
117 png_structp png_ptr = (png_structp)m_png_ptr;
118 png_infop info_ptr = (png_infop)m_info_ptr;
119 png_infop end_info = (png_infop)m_end_info;
120 png_destroy_read_struct( &png_ptr, &info_ptr, &end_info );
121 m_png_ptr = m_info_ptr = m_end_info = 0;
126 void PngDecoder::readDataFromBuf( void* _png_ptr, uchar* dst, size_t size )
128 png_structp png_ptr = (png_structp)_png_ptr;
129 PngDecoder* decoder = (PngDecoder*)(png_get_io_ptr(png_ptr));
130 CV_Assert( decoder );
131 const Mat& buf = decoder->m_buf;
132 if( decoder->m_buf_pos + size > buf.cols*buf.rows*buf.elemSize() )
134 png_error(png_ptr, "PNG input buffer is incomplete");
137 memcpy( dst, &decoder->m_buf.data[decoder->m_buf_pos], size );
138 decoder->m_buf_pos += size;
141 bool PngDecoder::readHeader()
146 png_structp png_ptr = png_create_read_struct( PNG_LIBPNG_VER_STRING, 0, 0, 0 );
150 png_infop info_ptr = png_create_info_struct( png_ptr );
151 png_infop end_info = png_create_info_struct( png_ptr );
154 m_info_ptr = info_ptr;
155 m_end_info = end_info;
158 if( info_ptr && end_info )
160 if( setjmp( png_jmpbuf( png_ptr ) ) == 0 )
163 png_set_read_fn(png_ptr, this, (png_rw_ptr)readDataFromBuf );
166 m_f = fopen( m_filename.c_str(), "rb" );
168 png_init_io( png_ptr, m_f );
171 if( !m_buf.empty() || m_f )
173 png_uint_32 wdth, hght;
174 int bit_depth, color_type;
176 png_read_info( png_ptr, info_ptr );
178 png_get_IHDR( png_ptr, info_ptr, &wdth, &hght,
179 &bit_depth, &color_type, 0, 0, 0 );
182 m_height = (int)hght;
183 m_color_type = color_type;
184 m_bit_depth = bit_depth;
186 if( bit_depth <= 8 || bit_depth == 16 )
190 case PNG_COLOR_TYPE_RGB:
191 case PNG_COLOR_TYPE_PALETTE:
194 case PNG_COLOR_TYPE_RGB_ALPHA:
200 if( bit_depth == 16 )
201 m_type = CV_MAKETYPE(CV_16U, CV_MAT_CN(m_type));
216 bool PngDecoder::readData( Mat& img )
219 AutoBuffer<uchar*> _buffer(m_height);
220 uchar** buffer = _buffer;
221 int color = img.channels() > 1;
222 uchar* data = img.data;
223 int step = (int)img.step;
225 if( m_png_ptr && m_info_ptr && m_end_info && m_width && m_height )
227 png_structp png_ptr = (png_structp)m_png_ptr;
228 png_infop info_ptr = (png_infop)m_info_ptr;
229 png_infop end_info = (png_infop)m_end_info;
231 if( setjmp( png_jmpbuf ( png_ptr ) ) == 0 )
235 if( img.depth() == CV_8U && m_bit_depth == 16 )
236 png_set_strip_16( png_ptr );
237 else if( !isBigEndian() )
238 png_set_swap( png_ptr );
240 if(img.channels() < 4)
242 /* observation: png_read_image() writes 400 bytes beyond
243 * end of data when reading a 400x118 color png
244 * "mpplus_sand.png". OpenCV crashes even with demo
245 * programs. Looking at the loaded image I'd say we get 4
246 * bytes per pixel instead of 3 bytes per pixel. Test
247 * indicate that it is a good idea to always ask for
248 * stripping alpha.. 18.11.2004 Axel Walthelm
250 png_set_strip_alpha( png_ptr );
253 if( m_color_type == PNG_COLOR_TYPE_PALETTE )
254 png_set_palette_to_rgb( png_ptr );
256 if( m_color_type == PNG_COLOR_TYPE_GRAY && m_bit_depth < 8 )
257 #if (PNG_LIBPNG_VER_MAJOR*10000 + PNG_LIBPNG_VER_MINOR*100 + PNG_LIBPNG_VER_RELEASE >= 10209) || \
258 (PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR == 0 && PNG_LIBPNG_VER_RELEASE >= 18)
259 png_set_expand_gray_1_2_4_to_8( png_ptr );
261 png_set_gray_1_2_4_to_8( png_ptr );
264 if( CV_MAT_CN(m_type) > 1 && color )
265 png_set_bgr( png_ptr ); // convert RGB to BGR
267 png_set_gray_to_rgb( png_ptr ); // Gray->RGB
269 png_set_rgb_to_gray( png_ptr, 1, 0.299, 0.587 ); // RGB->Gray
271 png_read_update_info( png_ptr, info_ptr );
273 for( y = 0; y < m_height; y++ )
274 buffer[y] = data + y*step;
276 png_read_image( png_ptr, buffer );
277 png_read_end( png_ptr, end_info );
288 /////////////////////// PngEncoder ///////////////////
291 PngEncoder::PngEncoder()
293 m_description = "Portable Network Graphics files (*.png)";
294 m_buf_supported = true;
298 PngEncoder::~PngEncoder()
303 bool PngEncoder::isFormatSupported( int depth ) const
305 return depth == CV_8U || depth == CV_16U;
308 ImageEncoder PngEncoder::newEncoder() const
310 return new PngEncoder;
314 void PngEncoder::writeDataToBuf(void* _png_ptr, uchar* src, size_t size)
318 png_structp png_ptr = (png_structp)_png_ptr;
319 PngEncoder* encoder = (PngEncoder*)(png_get_io_ptr(png_ptr));
320 CV_Assert( encoder && encoder->m_buf );
321 size_t cursz = encoder->m_buf->size();
322 encoder->m_buf->resize(cursz + size);
323 memcpy( &(*encoder->m_buf)[cursz], src, size );
327 void PngEncoder::flushBuf(void*)
331 bool PngEncoder::write( const Mat& img, const vector<int>& params )
333 png_structp png_ptr = png_create_write_struct( PNG_LIBPNG_VER_STRING, 0, 0, 0 );
334 png_infop info_ptr = 0;
336 int y, width = img.cols, height = img.rows;
337 int depth = img.depth(), channels = img.channels();
339 AutoBuffer<uchar*> buffer;
341 if( depth != CV_8U && depth != CV_16U )
346 info_ptr = png_create_info_struct( png_ptr );
350 if( setjmp( png_jmpbuf ( png_ptr ) ) == 0 )
354 png_set_write_fn(png_ptr, this,
355 (png_rw_ptr)writeDataToBuf, (png_flush_ptr)flushBuf);
359 f = fopen( m_filename.c_str(), "wb" );
361 png_init_io( png_ptr, f );
364 int compression_level = -1; // Invalid value to allow setting 0-9 as valid
365 int compression_strategy = Z_RLE; // Default strategy
366 bool isBilevel = false;
368 for( size_t i = 0; i < params.size(); i += 2 )
370 if( params[i] == CV_IMWRITE_PNG_COMPRESSION )
372 compression_level = params[i+1];
373 compression_level = MIN(MAX(compression_level, 0), Z_BEST_COMPRESSION);
375 if( params[i] == CV_IMWRITE_PNG_STRATEGY )
377 compression_strategy = params[i+1];
378 compression_strategy = MIN(MAX(compression_strategy, 0), Z_FIXED);
380 if( params[i] == CV_IMWRITE_PNG_BILEVEL )
382 isBilevel = params[i+1] != 0;
388 if( compression_level >= 0 )
390 png_set_compression_level( png_ptr, compression_level );
394 // tune parameters for speed
395 // (see http://wiki.linuxquestions.org/wiki/Libpng)
396 png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_FILTER_SUB);
397 png_set_compression_level(png_ptr, Z_BEST_SPEED);
399 png_set_compression_strategy(png_ptr, compression_strategy);
401 png_set_IHDR( png_ptr, info_ptr, width, height, depth == CV_8U ? isBilevel?1:8 : 16,
402 channels == 1 ? PNG_COLOR_TYPE_GRAY :
403 channels == 3 ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGBA,
404 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
405 PNG_FILTER_TYPE_DEFAULT );
407 png_write_info( png_ptr, info_ptr );
410 png_set_packing(png_ptr);
412 png_set_bgr( png_ptr );
414 png_set_swap( png_ptr );
416 buffer.allocate(height);
417 for( y = 0; y < height; y++ )
418 buffer[y] = img.data + y*img.step;
420 png_write_image( png_ptr, buffer );
421 png_write_end( png_ptr, info_ptr );
429 png_destroy_write_struct( &png_ptr, &info_ptr );