Class PngIhdrChunk

java.lang.Object

org.eclipse.swt.internal.image.PngChunk

org.eclipse.swt.internal.image.PngIhdrChunk

class PngIhdrChunk
extends PngChunk

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final int	BIT_DEPTH_OFFSET
(package private) byte	bitDepth
(package private) static final byte	COLOR_TYPE_GRAYSCALE
(package private) static final byte	COLOR_TYPE_GRAYSCALE_WITH_ALPHA
(package private) static final int	COLOR_TYPE_OFFSET
(package private) static final byte	COLOR_TYPE_PALETTE
(package private) static final byte	COLOR_TYPE_RGB
(package private) static final byte	COLOR_TYPE_RGB_WITH_ALPHA
(package private) byte	colorType
(package private) static final int	COMPRESSION_METHOD_OFFSET
(package private) byte	compressionMethod
(package private) static final int	FILTER_AVERAGE
(package private) static final int	FILTER_METHOD_OFFSET
(package private) static final int	FILTER_NONE
(package private) static final int	FILTER_PAETH
(package private) static final int	FILTER_SUB
(package private) static final int	FILTER_UP
(package private) byte	filterMethod
(package private) int	height
(package private) static final int	HEIGHT_DATA_OFFSET
(package private) static final int	IHDR_DATA_LENGTH
(package private) static final int	INTERLACE_METHOD_ADAM7
(package private) static final int	INTERLACE_METHOD_NONE
(package private) static final int	INTERLACE_METHOD_OFFSET
(package private) byte	interlaceMethod
(package private) static final byte[]	ValidBitDepths
(package private) static final byte[]	ValidColorTypes
(package private) int	width
(package private) static final int	WIDTH_DATA_OFFSET

Fields inherited from class PngChunk

CHUNK_IDAT, CHUNK_IEND, CHUNK_IHDR, CHUNK_PLTE, CHUNK_tRNS, CHUNK_UNKNOWN, CRC_TABLE, DATA_OFFSET, length, LENGTH_FIELD_LENGTH, LENGTH_OFFSET, MIN_LENGTH, reference, TYPE_FIELD_LENGTH, TYPE_IDAT, TYPE_IEND, TYPE_IHDR, TYPE_OFFSET, TYPE_PLTE, TYPE_tRNS

Constructor Summary

Constructors

Constructor	Description
PngIhdrChunk(byte[] reference)	Construct a PNGChunk using the reference bytes given.
PngIhdrChunk(int width, int height, byte bitDepth, byte colorType, byte compressionMethod, byte filterMethod, byte interlaceMethod)

Method Summary

Modifier and Type	Method	Description
(package private) void	contributeToString(StringBuilder buffer)	Provided so that subclasses can override and add data to the toString() call.
(package private) PaletteData	createGrayscalePalette()
(package private) byte	getBitDepth()	Get the image's bit depth.
(package private) int	getBitsPerPixel()	Answer the pixel size in bits based on the color type and bit depth.
(package private) boolean	getCanHavePalette()
(package private) int	getChunkType()
(package private) byte	getColorType()	Get the image's color type.
(package private) String	getColorTypeString()
(package private) byte	getCompressionMethod()	Get the image's compression method.
(package private) int	getFilterByteOffset()
(package private) byte	getFilterMethod()	Get the image's filter method.
(package private) String	getFilterMethodString()
(package private) int	getHeight()	Get the image's height in pixels.
(package private) byte	getInterlaceMethod()	Get the image's interlace method.
(package private) String	getInterlaceMethodString()
(package private) boolean	getMustHavePalette()
(package private) PaletteData	getPaletteData()
(package private) int	getSwtBitsPerPixel()	Answer the pixel size in bits based on the color type and bit depth.
(package private) int	getWidth()	Get the image's width in pixels.
(package private) void	setBitDepth(byte value)	Set the image's bit depth.
(package private) void	setColorType(byte value)	Set the image's color type.
(package private) void	setCompressionMethod(byte value)	Set the image's compression method.
(package private) void	setFilterMethod(byte value)	Set the image's filter method.
(package private) void	setHeight(int value)	Set the image's height in pixels.
(package private) void	setInterlaceMethod(byte value)	Set the image's interlace method.
(package private) void	setWidth(int value)	Set the image's width in pixels.
(package private) boolean	usesDirectColor()
(package private) void	validate(PngFileReadState readState, PngIhdrChunk headerChunk)	Answer whether the chunk is a valid IHDR chunk.

Methods inherited from class PngChunk

checkCRC, computeCRC, getCRC, getData, getInt16, getInt32, getLength, getReference, getSize, getTypeBytes, isCritical, readNextFromStream, setCRC, setData, setInt16, setInt32, setLength, setReference, setType, toString, typeMatchesArray

Methods inherited from class Object

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

Field Details

IHDR_DATA_LENGTH

static final int IHDR_DATA_LENGTH

See Also:

• Constant Field Values

WIDTH_DATA_OFFSET

static final int WIDTH_DATA_OFFSET

See Also:

• Constant Field Values

HEIGHT_DATA_OFFSET

static final int HEIGHT_DATA_OFFSET

See Also:

• Constant Field Values

BIT_DEPTH_OFFSET

static final int BIT_DEPTH_OFFSET

See Also:

• Constant Field Values

COLOR_TYPE_OFFSET

static final int COLOR_TYPE_OFFSET

See Also:

• Constant Field Values

COMPRESSION_METHOD_OFFSET

static final int COMPRESSION_METHOD_OFFSET

See Also:

• Constant Field Values

FILTER_METHOD_OFFSET

static final int FILTER_METHOD_OFFSET

See Also:

• Constant Field Values

INTERLACE_METHOD_OFFSET

static final int INTERLACE_METHOD_OFFSET

See Also:

• Constant Field Values

COLOR_TYPE_GRAYSCALE

static final byte COLOR_TYPE_GRAYSCALE

See Also:

• Constant Field Values

COLOR_TYPE_RGB

static final byte COLOR_TYPE_RGB

See Also:

• Constant Field Values

COLOR_TYPE_PALETTE

static final byte COLOR_TYPE_PALETTE

See Also:

• Constant Field Values

COLOR_TYPE_GRAYSCALE_WITH_ALPHA

static final byte COLOR_TYPE_GRAYSCALE_WITH_ALPHA

See Also:

• Constant Field Values

COLOR_TYPE_RGB_WITH_ALPHA

static final byte COLOR_TYPE_RGB_WITH_ALPHA

See Also:

• Constant Field Values

INTERLACE_METHOD_NONE

static final int INTERLACE_METHOD_NONE

See Also:

• Constant Field Values

INTERLACE_METHOD_ADAM7

static final int INTERLACE_METHOD_ADAM7

See Also:

• Constant Field Values

FILTER_NONE

static final int FILTER_NONE

See Also:

• Constant Field Values

FILTER_SUB

static final int FILTER_SUB

See Also:

• Constant Field Values

FILTER_UP

static final int FILTER_UP

See Also:

• Constant Field Values

FILTER_AVERAGE

static final int FILTER_AVERAGE

See Also:

• Constant Field Values

FILTER_PAETH

static final int FILTER_PAETH

See Also:

• Constant Field Values

ValidBitDepths

static final byte[] ValidBitDepths

ValidColorTypes

static final byte[] ValidColorTypes

width

int width

height

int height

bitDepth

byte bitDepth

colorType

byte colorType

compressionMethod

byte compressionMethod

filterMethod

byte filterMethod

interlaceMethod

byte interlaceMethod

Constructor Details

PngIhdrChunk

PngIhdrChunk(int width,
 int height,
 byte bitDepth,
 byte colorType,
 byte compressionMethod,
 byte filterMethod,
 byte interlaceMethod)

PngIhdrChunk

PngIhdrChunk(byte[] reference)

Construct a PNGChunk using the reference bytes given.

Method Details

getChunkType

int getChunkType()

Overrides:

getChunkType in class PngChunk

getWidth

int getWidth()

Get the image's width in pixels.

setWidth

void setWidth(int value)

Set the image's width in pixels.

getHeight

int getHeight()

Get the image's height in pixels.

setHeight

void setHeight(int value)

Set the image's height in pixels.

getBitDepth

byte getBitDepth()

Get the image's bit depth. This is limited to the values 1, 2, 4, 8, or 16.

setBitDepth

void setBitDepth(byte value)

Set the image's bit depth. This is limited to the values 1, 2, 4, 8, or 16.

getColorType

byte getColorType()

Get the image's color type. This is limited to the values: 0 - Grayscale image. 2 - RGB triple. 3 - Palette. 4 - Grayscale with Alpha channel. 6 - RGB with Alpha channel.

setColorType

void setColorType(byte value)

Set the image's color type. This is limited to the values: 0 - Grayscale image. 2 - RGB triple. 3 - Palette. 4 - Grayscale with Alpha channel. 6 - RGB with Alpha channel.

getCompressionMethod

byte getCompressionMethod()

Get the image's compression method. This value must be 0.

setCompressionMethod

void setCompressionMethod(byte value)

Set the image's compression method. This value must be 0.

getFilterMethod

byte getFilterMethod()

Get the image's filter method. This value must be 0.

setFilterMethod

void setFilterMethod(byte value)

Set the image's filter method. This value must be 0.

getInterlaceMethod

byte getInterlaceMethod()

Get the image's interlace method. This value is limited to: 0 - No interlacing used. 1 - Adam7 interlacing used.

setInterlaceMethod

void setInterlaceMethod(byte value)

Set the image's interlace method. This value is limited to: 0 - No interlacing used. 1 - Adam7 interlacing used.

validate

void validate(PngFileReadState readState,
 PngIhdrChunk headerChunk)

Answer whether the chunk is a valid IHDR chunk.

Overrides:

validate in class PngChunk

getColorTypeString

String getColorTypeString()

getFilterMethodString

String getFilterMethodString()

getInterlaceMethodString

String getInterlaceMethodString()

contributeToString

void contributeToString(StringBuilder buffer)

Description copied from class: PngChunk

Provided so that subclasses can override and add data to the toString() call.

Overrides:

contributeToString in class PngChunk

getMustHavePalette

boolean getMustHavePalette()

getCanHavePalette

boolean getCanHavePalette()

getBitsPerPixel

int getBitsPerPixel()

Answer the pixel size in bits based on the color type and bit depth.

getSwtBitsPerPixel

int getSwtBitsPerPixel()

Answer the pixel size in bits based on the color type and bit depth.

getFilterByteOffset

int getFilterByteOffset()

usesDirectColor

boolean usesDirectColor()

createGrayscalePalette

PaletteData createGrayscalePalette()

getPaletteData

PaletteData getPaletteData()