input_impl ( tu_file *in )
:
m_compressor_opened ( false )
// Constructor. Read the header data from in, and
// prepare to read data.
{
setup_jpeg_err ( &m_jerr );
m_cinfo.err = &m_jerr;
// Initialize decompression object.
jpeg_create_decompress ( &m_cinfo );
setup_rw_source ( &m_cinfo, in );
start_image();
}
JpegImageInput::JpegImageInput(boost::shared_ptr<IOChannel> in)
:
ImageInput(in),
_errorOccurred(0),
_compressorOpened(false)
{
setup_jpeg_err(&m_jerr);
m_cinfo.err = &m_jerr;
m_cinfo.client_data = this;
// Initialize decompression object.
jpeg_create_decompress(&m_cinfo);
rw_source_IOChannel::setup(&m_cinfo, in);
}
input_impl ( SWF_DEFINE_BITS_JPEG2_HEADER_ONLY e, tu_file *in )
:
m_compressor_opened ( false )
// The SWF file format stores JPEG images with the
// encoding tables separate from the image data. This
// constructor reads the encoding table only and keeps
// them in this object. You need to call
// start_image() and finish_image() around any calls
// to get_width/height/components and read_scanline.
{
setup_jpeg_err ( &m_jerr );
m_cinfo.err = &m_jerr;
// Initialize decompression object.
jpeg_create_decompress ( &m_cinfo );
setup_rw_source ( &m_cinfo, in );
// Read the encoding tables.
jpeg_read_header ( &m_cinfo, FALSE );
// Don't start reading any image data!
// App does that manually using start_image.
}