Class WebPImageReader

java.lang.Object

javax.imageio.ImageReader

com.twelvemonkeys.imageio.ImageReaderBase

com.twelvemonkeys.imageio.plugins.webp.WebPImageReader

final class WebPImageReader
extends ImageReaderBase

WebPImageReader

Field Summary

Fields

Modifier and Type	Field	Description
private ICC_Profile	containedICCP
(package private) static final boolean	DEBUG
private long	fileSize
private final List<AnimationFrame>	frames
private VP8xChunk	header
private ICC_Profile	iccProfile
private LSBBitReader	lsbBitReader

Fields inherited from class ImageReaderBase

imageInput

Fields inherited from class ImageReader

availableLocales, ignoreMetadata, input, locale, minIndex, originatingProvider, progressListeners, seekForwardOnly, updateListeners, warningListeners, warningLocales

Constructor Summary

Constructors

Constructor	Description
WebPImageReader(ImageReaderSpi provider)

Method Summary

Modifier and Type	Method	Description
private void	alphaFilter(WritableRaster alphaRaster, int filtering)
private void	applyICCProfileIfNeeded(BufferedImage destination)
(package private) static String	fourCC(int value)
int	getHeight(int imageIndex)
IIOMetadata	getImageMetadata(int imageIndex)	Default implementation that always returns null.
Iterator<ImageTypeSpecifier>	getImageTypes(int imageIndex)
int	getNumImages(boolean allowSearch)	Default implementation that always returns 1.
private int	getPredictorAlpha(WritableRaster alphaRaster, int filtering, int y, int x)
ImageTypeSpecifier	getRawImageType(int imageIndex)
int	getWidth(int imageIndex)
private void	opaqueAlpha(WritableRaster alphaRaster)
BufferedImage	read(int imageIndex, ImageReadParam param)
private void	readAllFrames()
private void	readAlpha(BufferedImage destination, ImageReadParam param, int width, int height)
private void	readFrame(int frameIndex)
private void	readHeader()
private void	readHeader(int imageIndex)
private void	readMeta()
private void	readUncompressedAlpha(WritableRaster alphaRaster)
private void	readVP8(WritableRaster raster, ImageReadParam param)
private void	readVP8Extended(BufferedImage destination, ImageReadParam param, long streamEnd)
private void	readVP8Extended(BufferedImage destination, ImageReadParam param, long streamEnd, int width, int height)
private void	readVP8Lossless(WritableRaster raster, ImageReadParam param)
private void	readVP8Lossless(WritableRaster raster, ImageReadParam param, int width, int height)
protected void	resetMembers()	Resets all member variables.
void	setInput(Object input, boolean seekForwardOnly, boolean ignoreMetadata)	Overrides setInput, to allow easy access to the input, in case it is an ImageInputStream.

Methods inherited from class ImageReaderBase

assertInput, checkBounds, dispose, fakeAOI, fakeSubsampling, getDestination, getStreamMetadata, hasExplicitDestination, main, reset, showIt

Methods inherited from class ImageReader

abort, abortRequested, addIIOReadProgressListener, addIIOReadUpdateListener, addIIOReadWarningListener, canReadRaster, checkReadParamBandSettings, clearAbortRequest, computeRegions, getAspectRatio, getAvailableLocales, getDefaultReadParam, getFormatName, getImageMetadata, getInput, getLocale, getMinIndex, getNumThumbnails, getOriginatingProvider, getSourceRegion, getStreamMetadata, getThumbnailHeight, getThumbnailWidth, getTileGridXOffset, getTileGridYOffset, getTileHeight, getTileWidth, hasThumbnails, isIgnoringMetadata, isImageTiled, isRandomAccessEasy, isSeekForwardOnly, processImageComplete, processImageProgress, processImageStarted, processImageUpdate, processPassComplete, processPassStarted, processReadAborted, processSequenceComplete, processSequenceStarted, processThumbnailComplete, processThumbnailPassComplete, processThumbnailPassStarted, processThumbnailProgress, processThumbnailStarted, processThumbnailUpdate, processWarningOccurred, processWarningOccurred, read, readAll, readAll, readAsRenderedImage, readerSupportsThumbnails, readRaster, readThumbnail, readTile, readTileRaster, removeAllIIOReadProgressListeners, removeAllIIOReadUpdateListeners, removeAllIIOReadWarningListeners, removeIIOReadProgressListener, removeIIOReadUpdateListener, removeIIOReadWarningListener, setInput, setInput, setLocale

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

DEBUG

static final boolean DEBUG

lsbBitReader

private LSBBitReader lsbBitReader

fileSize

private long fileSize

header

private VP8xChunk header

containedICCP

private ICC_Profile containedICCP

iccProfile

private ICC_Profile iccProfile

frames

private final List<AnimationFrame> frames

Constructor Details

WebPImageReader

WebPImageReader(ImageReaderSpi provider)

Method Details

resetMembers

protected void resetMembers()

Description copied from class: ImageReaderBase

Resets all member variables. This method is by default invoked from:

• ImageReaderBase.setInput(Object, boolean, boolean)
• ImageReaderBase.dispose()
• ImageReaderBase.reset()

Specified by:

resetMembers in class ImageReaderBase

setInput

public void setInput(Object input,
 boolean seekForwardOnly,
 boolean ignoreMetadata)

Description copied from class: ImageReaderBase

Overrides setInput, to allow easy access to the input, in case it is an ImageInputStream.

Overrides:

setInput in class ImageReaderBase

Parameters:

input - the ImageInputStream or other Object to use for future decoding.

seekForwardOnly - if true, images and metadata may only be read in ascending order from this input source.

ignoreMetadata - if true, metadata may be ignored during reads.

See Also:

• ImageInputStream

readHeader

private void readHeader(int imageIndex)
                 throws IOException

Throws:

IOException

readFrame

private void readFrame(int frameIndex)
                throws IOException

Throws:

IOException

readHeader

private void readHeader()
                 throws IOException

Throws:

IOException

fourCC

static String fourCC(int value)

getNumImages

public int getNumImages(boolean allowSearch)
                 throws IOException

Description copied from class: ImageReaderBase

Default implementation that always returns 1.

Overrides:

getNumImages in class ImageReaderBase

Parameters:

allowSearch - ignored, unless overridden

Returns:

1, unless overridden

Throws:

IOException - never, unless overridden

readAllFrames

private void readAllFrames()
                    throws IOException

Throws:

IOException

getWidth

public int getWidth(int imageIndex)
             throws IOException

Specified by:

getWidth in class ImageReader

Throws:

IOException

getHeight

public int getHeight(int imageIndex)
              throws IOException

Specified by:

getHeight in class ImageReader

Throws:

IOException

getRawImageType

public ImageTypeSpecifier getRawImageType(int imageIndex)
                                   throws IOException

Overrides:

getRawImageType in class ImageReader

Throws:

IOException

getImageTypes

public Iterator<ImageTypeSpecifier> getImageTypes(int imageIndex)
                                           throws IOException

Specified by:

getImageTypes in class ImageReader

Throws:

IOException

read

public BufferedImage read(int imageIndex,
 ImageReadParam param)
                   throws IOException

Specified by:

read in class ImageReader

Throws:

IOException

readVP8Extended

private void readVP8Extended(BufferedImage destination,
 ImageReadParam param,
 long streamEnd)
                      throws IOException

Throws:

IOException

readVP8Extended

private void readVP8Extended(BufferedImage destination,
 ImageReadParam param,
 long streamEnd,
 int width,
 int height)
                      throws IOException

Throws:

IOException

readAlpha

private void readAlpha(BufferedImage destination,
 ImageReadParam param,
 int width,
 int height)
                throws IOException

Throws:

IOException

alphaFilter

private void alphaFilter(WritableRaster alphaRaster,
 int filtering)

getPredictorAlpha

private int getPredictorAlpha(WritableRaster alphaRaster,
 int filtering,
 int y,
 int x)

applyICCProfileIfNeeded

private void applyICCProfileIfNeeded(BufferedImage destination)

opaqueAlpha

private void opaqueAlpha(WritableRaster alphaRaster)

readUncompressedAlpha

private void readUncompressedAlpha(WritableRaster alphaRaster)
                            throws IOException

Throws:

IOException

readVP8Lossless

private void readVP8Lossless(WritableRaster raster,
 ImageReadParam param)
                      throws IOException

Throws:

IOException

readVP8Lossless

private void readVP8Lossless(WritableRaster raster,
 ImageReadParam param,
 int width,
 int height)
                      throws IOException

Throws:

IOException

readVP8

private void readVP8(WritableRaster raster,
 ImageReadParam param)
              throws IOException

Throws:

IOException

getImageMetadata

public IIOMetadata getImageMetadata(int imageIndex)
                             throws IOException

Description copied from class: ImageReaderBase

Default implementation that always returns null.

Overrides:

getImageMetadata in class ImageReaderBase

Parameters:

imageIndex - ignored, unless overridden

Returns:

null, unless overridden

Throws:

IOException - never, unless overridden.

readMeta

private void readMeta()
               throws IOException

Throws:

IOException