pagespeed::image_compression::ScanlineReaderInterface Class Reference

Inheritance diagram for pagespeed::image_compression::ScanlineReaderInterface:

Public Member Functions
virtual bool	Reset ()=0
virtual size_t	GetBytesPerScanline ()=0
	Returns number of bytes that required to store a scanline.
virtual bool	HasMoreScanLines ()=0
	Returns true if there are more scanlines to read.
virtual ScanlineStatus	InitializeWithStatus (const void *image_buffer, size_t buffer_length)=0
bool	Initialize (const void *image_buffer, size_t buffer_length)
virtual ScanlineStatus	ReadNextScanlineWithStatus (void **out_scanline_bytes)=0
bool	ReadNextScanline (void **out_scanline_bytes)
virtual size_t	GetImageHeight ()=0
	Returns the height of the image.
virtual size_t	GetImageWidth ()=0
	Returns the width of the image.
virtual PixelFormat	GetPixelFormat ()=0
	Returns the pixel format that need to be used by writer.
virtual bool	IsProgressive ()=0

Member Function Documentation

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

pure 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

Implemented in pagespeed::image_compression::PngScanlineReaderRaw, pagespeed::image_compression::WebpScanlineReader, pagespeed::image_compression::PngScanlineReader, pagespeed::image_compression::JpegScanlineReader, pagespeed::image_compression::ScanlineResizer, pagespeed::image_compression::PixelFormatOptimizer, and pagespeed::image_compression::FrameToScanlineReaderAdapter.

bool pagespeed::image_compression::ScanlineReaderInterface::ReadNextScanline ( void **  out_scanline_bytes )

inline

Reads the next available scanline. Returns false if the scan fails.

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

pure virtual

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

Implemented in pagespeed::image_compression::PngScanlineReaderRaw, pagespeed::image_compression::WebpScanlineReader, pagespeed::image_compression::PngScanlineReader, pagespeed::image_compression::JpegScanlineReader, pagespeed::image_compression::FrameToScanlineReaderAdapter, pagespeed::image_compression::ScanlineResizer, and pagespeed::image_compression::PixelFormatOptimizer.

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

pure 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.

Implemented in pagespeed::image_compression::PngScanlineReaderRaw, pagespeed::image_compression::WebpScanlineReader, pagespeed::image_compression::PngScanlineReader, pagespeed::image_compression::JpegScanlineReader, pagespeed::image_compression::ScanlineResizer, pagespeed::image_compression::FrameToScanlineReaderAdapter, and pagespeed::image_compression::PixelFormatOptimizer.

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

• pagespeed/kernel/image/scanline_interface.h