void CopyBuffer () {
mOutput.append (mTmpBuf, BUF_SIZE);
pub.next_output_byte = mTmpBuf;
pub.free_in_buffer = BUF_SIZE;
}
void user_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
QuickVec<unsigned char> *buffer = (QuickVec<unsigned char> *)png_get_io_ptr(png_ptr);
buffer->append((unsigned char *)data,(int)length);
}
void TermBuffer()
{
mOutput.append( mTmpBuf, BUF_SIZE - pub.free_in_buffer );
}