pagespeed::image_compression::FrameToScanlineReaderAdapter Class Reference

MultipleFrame API to Scanline API adapters. More...

#include "scanline_interface_frame_adapter.h"

Inheritance diagram for pagespeed::image_compression::FrameToScanlineReaderAdapter:

Public Member Functions
	FrameToScanlineReaderAdapter (MultipleFrameReader *frame_reader)
	Acquires ownership of 'frame_reader'.
virtual bool	Reset ()
virtual size_t	GetBytesPerScanline ()
	Returns number of bytes that required to store a scanline.
virtual bool	HasMoreScanLines ()
	Returns true if there are more scanlines to read.
virtual bool	IsProgressive ()
virtual ScanlineStatus	InitializeWithStatus (const void *image_buffer, size_t buffer_length)
virtual ScanlineStatus	ReadNextScanlineWithStatus (void **out_scanline_bytes)
virtual size_t	GetImageHeight ()
	Returns the height of the image.
virtual size_t	GetImageWidth ()
	Returns the width of the image.
virtual PixelFormat	GetPixelFormat ()
	Returns the pixel format that need to be used by writer.
Public Member Functions inherited from pagespeed::image_compression::ScanlineReaderInterface
bool	Initialize (const void *image_buffer, size_t buffer_length)
bool	ReadNextScanline (void **out_scanline_bytes)

Detailed Description

MultipleFrame API to Scanline API adapters.

The class FrameToScanlineReaderAdapter takes ownership of a MultipleFrameReader and exposes ScanlineReaderInterface methods.

Member Function Documentation

virtual ScanlineStatus pagespeed::image_compression::FrameToScanlineReaderAdapter::InitializeWithStatus ( const void *  image_buffer, size_t  buffer_length  )

virtual

Will return an error status if the underlying MultipleFrameReader is processing an animated image.

Implements pagespeed::image_compression::ScanlineReaderInterface.

virtual bool pagespeed::image_compression::FrameToScanlineReaderAdapter::IsProgressive ( )

virtual

Returns true if the original image was encoded progressively by the origin site, so that it could be progressively rendered while the image contents were being transferred

Implements pagespeed::image_compression::ScanlineReaderInterface.

virtual ScanlineStatus pagespeed::image_compression::FrameToScanlineReaderAdapter::ReadNextScanlineWithStatus ( void **  out_scanline_bytes )

virtual

Reads the next available scanline. Returns the ScanlineStatus of the conversion.

Implements pagespeed::image_compression::ScanlineReaderInterface.

virtual bool pagespeed::image_compression::FrameToScanlineReaderAdapter::Reset ( )

virtual

Reset the ScanlineReaderIngterface to its initial state. This will only return false as a result of an unhandled error condition, such as a longjmp due to a libpng error.

Implements pagespeed::image_compression::ScanlineReaderInterface.

---

The documentation for this class was generated from the following file:

• pagespeed/kernel/image/scanline_interface_frame_adapter.h