本文整理汇总了C++中AutoBuffer::allocate方法的典型用法代码示例。如果您正苦于以下问题：C++ AutoBuffer::allocate方法的具体用法？C++ AutoBuffer::allocate怎么用？C++ AutoBuffer::allocate使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类AutoBuffer的用法示例。
在下文中一共展示了AutoBuffer::allocate方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: write
bool PngEncoder::write( const Mat& img, const vector<int>& params )
{
png_structp png_ptr = png_create_write_struct( PNG_LIBPNG_VER_STRING, 0, 0, 0 );
png_infop info_ptr = 0;
FILE* f = 0;
int y, width = img.cols, height = img.rows;
int depth = img.depth(), channels = img.channels();
bool result = false;
AutoBuffer<uchar*> buffer;
if( depth != CV_8U && depth != CV_16U )
return false;
if( png_ptr )
{
info_ptr = png_create_info_struct( png_ptr );
if( info_ptr )
{
if( setjmp( png_jmpbuf ( png_ptr ) ) == 0 )
{
if( m_buf )
{
png_set_write_fn(png_ptr, this,
(png_rw_ptr)writeDataToBuf, (png_flush_ptr)flushBuf);
}
else
{
f = fopen( m_filename.c_str(), "wb" );
if( f )
png_init_io( png_ptr, f );
}
int compression_level = -1; // Invalid value to allow setting 0-9 as valid
int compression_strategy = Z_RLE; // Default strategy
bool isBilevel = false;
for( size_t i = 0; i < params.size(); i += 2 )
{
if( params[i] == CV_IMWRITE_PNG_COMPRESSION )
{
compression_level = params[i+1];
compression_level = MIN(MAX(compression_level, 0), Z_BEST_COMPRESSION);
}
if( params[i] == CV_IMWRITE_PNG_STRATEGY )
{
compression_strategy = params[i+1];
compression_strategy = MIN(MAX(compression_strategy, 0), Z_FIXED);
}
if( params[i] == CV_IMWRITE_PNG_BILEVEL )
{
isBilevel = params[i+1] != 0;
}
}
if( m_buf || f )
{
if( compression_level >= 0 )
{
png_set_compression_level( png_ptr, compression_level );
}
else
{
// tune parameters for speed
// (see http://wiki.linuxquestions.org/wiki/Libpng)
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, compression_strategy);
png_set_IHDR( png_ptr, info_ptr, width, height, depth == CV_8U ? isBilevel?1:8 : 16,
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 );
if (isBilevel)
png_set_packing(png_ptr);
png_set_bgr( png_ptr );
if( !isBigEndian() )
png_set_swap( png_ptr );
buffer.allocate(height);
for( y = 0; y < height; y++ )
buffer[y] = img.data + y*img.step;
png_write_image( png_ptr, buffer );
png_write_end( png_ptr, info_ptr );
result = true;
}
}
}
}
png_destroy_write_struct( &png_ptr, &info_ptr );
if(f) fclose( f );
//.........这里部分代码省略.........