generic-library/opencv
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added compression strategy as a parameter (another request from ticket #1452)

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This commit is contained in:
Vadim Pisarevsky 2011-10-28 04:11:02 +00:00
parent 17c3102705
commit 448a252776
3 changed files with 19 additions and 1 deletions
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6
modules/highgui/include/opencv2/highgui/highgui.hpp
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@ -150,6 +150,12 @@ enum
{
IMWRITE_JPEG_QUALITY =1,
IMWRITE_PNG_COMPRESSION =16,
IMWRITE_PNG_STRATEGY =17,
IMWRITE_PNG_STRATEGY_DEFAULT =0,
IMWRITE_PNG_STRATEGY_FILTERED =1,
IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY =2,
IMWRITE_PNG_STRATEGY_RLE =3,
IMWRITE_PNG_STRATEGY_FIXED =4,
IMWRITE_PXM_BINARY =32
};

6
modules/highgui/include/opencv2/highgui/highgui_c.h
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@ -217,6 +217,12 @@ enum
{
CV_IMWRITE_JPEG_QUALITY =1,
CV_IMWRITE_PNG_COMPRESSION =16,
CV_IMWRITE_PNG_STRATEGY =17,
CV_IMWRITE_PNG_STRATEGY_DEFAULT =0,
CV_IMWRITE_PNG_STRATEGY_FILTERED =1,
CV_IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY =2,
CV_IMWRITE_PNG_STRATEGY_RLE =3,
CV_IMWRITE_PNG_STRATEGY_FIXED =4,
CV_IMWRITE_PXM_BINARY =32
};

8
modules/highgui/src/grfmt_png.cpp
View File

@ -312,6 +312,7 @@ void PngEncoder::flushBuf(void*)
bool PngEncoder::write( const Mat& img, const vector<int>& params )
{
int compression_level = 0;
int compression_strategy = Z_RLE;
for( size_t i = 0; i < params.size(); i += 2 )
{
@ -320,6 +321,11 @@ bool PngEncoder::write( const Mat& img, const vector<int>& params )
compression_level = params[i+1];
compression_level = MIN(MAX(compression_level, 0), MAX_MEM_LEVEL);
}
if( params[i] == CV_IMWRITE_PNG_STRATEGY )
{
compression_strategy = params[i+1];
compression_strategy = MIN(MAX(compression_strategy, 0), Z_FIXED);
}
}
png_structp png_ptr = png_create_write_struct( PNG_LIBPNG_VER_STRING, 0, 0, 0 );
@ -366,7 +372,7 @@ bool PngEncoder::write( const Mat& img, const vector<int>& params )
png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_FILTER_SUB);
png_set_compression_level(png_ptr, Z_BEST_SPEED);
}
png_set_compression_strategy(png_ptr, Z_FILTERED);
png_set_compression_strategy(png_ptr, compression_strategy);
png_set_IHDR( png_ptr, info_ptr, width, height, depth == CV_8U ? 8 : 16,
channels == 1 ? PNG_COLOR_TYPE_GRAY :