Package com.sixlegs.png
Class PngConstants
- java.lang.Object
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- com.sixlegs.png.PngConstants
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Field Summary
Fields Modifier and Type Field Description static String
BACKGROUND
bKGD
: Background samplesstatic String
BIT_DEPTH
IHDR
: Bit depthstatic int
bKGD
Background colorstatic int
cHRM
Primary chromaticitiesstatic String
CHROMATICITY
cHRM
: Chromaticitystatic String
COLOR_TYPE
IHDR
: Color typestatic int
COLOR_TYPE_GRAY
IHDR
: Grayscale color typestatic int
COLOR_TYPE_GRAY_ALPHA
IHDR
: Grayscale+alpha color typestatic int
COLOR_TYPE_PALETTE
IHDR
: Palette color typestatic int
COLOR_TYPE_RGB
IHDR
: RGB color typestatic int
COLOR_TYPE_RGB_ALPHA
IHDR
: RGBA color typestatic String
COMPRESSION
IHDR
: Compression methodstatic int
COMPRESSION_BASE
IHDR
: Deflate/inflate compressionstatic String
FILTER
IHDR
: Filter methodstatic int
FILTER_BASE
IHDR
: Adaptive filteringstatic int
gAMA
Image gammastatic String
GAMMA
gAMA
: Gammastatic String
GIF_DELAY_TIME
gIFg
: GIF delay time (hundredths of a second)static String
GIF_DISPOSAL_METHOD
gIFg
: GIF disposal methodstatic String
GIF_USER_INPUT_FLAG
gIFg
: GIF user input flagstatic int
gIFg
GIF Graphic Control Extensionstatic int
gIFx
GIF Application Extensionstatic String
HEIGHT
IHDR
: Heightstatic int
hIST
Palette histogramstatic String
HISTOGRAM
hIST
: Palette histogramstatic String
ICC_PROFILE
iCCP
: ICC profilestatic String
ICC_PROFILE_NAME
iCCP
: ICC profile namestatic int
iCCP
Embedded ICC profilestatic int
IDAT
Image datastatic int
IEND
Image trailerstatic int
IHDR
Image headerstatic String
INTERLACE
IHDR
: Interlace methodstatic int
INTERLACE_ADAM7
IHDR
: Adam7 interlacestatic int
INTERLACE_NONE
IHDR
: No interlacestatic int
iTXt
International textual datastatic int
oFFs
Image offsetstatic String
PALETTE
PLTE
: Palette entriesstatic String
PALETTE_ALPHA
PLTE
: Palette alphastatic int
pCAL
Calibration of pixel valuesstatic int
pHYs
Physical pixel dimensionsstatic String
PIXEL_HEIGHT
sCAL
: Physical height of pixelstatic String
PIXEL_WIDTH
sCAL
: Physical width of pixelstatic String
PIXELS_PER_UNIT_X
pHYs
: Pixels per unit, X axisstatic String
PIXELS_PER_UNIT_Y
pHYs
: Pixels per unit, Y axisstatic int
PLTE
Palettestatic String
POSITION_UNIT
oFFs
: Unit for image offsetstatic int
POSITION_UNIT_MICROMETER
oFFs
: Unit is the micrometer (10^-6 meter)static int
POSITION_UNIT_PIXEL
oFFs
: Unit is the pixel (true dimensions unspecified)static String
POSITION_X
oFFs
: Image X positionstatic String
POSITION_Y
oFFs
: Image Y positionstatic String
RENDERING_INTENT
sRGB
: Rendering intentstatic int
sBIT
Significant bitsstatic int
sCAL
Physical scale of image subjectstatic String
SCALE_UNIT
sCAL
: Unit for physical scale of image subjectstatic int
SCALE_UNIT_METER
sCAL
: Unit is the meterstatic int
SCALE_UNIT_RADIAN
sCAL
: Unit is the radianstatic long
SIGNATURE
Eight byte magic number that begins all PNG imagesstatic String
SIGNIFICANT_BITS
sBIT
: Significant bitsstatic int
sPLT
Suggested palettestatic int
sRGB
Standard RGB color spacestatic int
SRGB_ABSOLUTE_COLORIMETRIC
sRGB
: Absolute colormetric rendering intentstatic int
SRGB_PERCEPTUAL
sRGB
: Perceptual rendering intentstatic int
SRGB_RELATIVE_COLORIMETRIC
sRGB
: Relative colorimetric rendering intentstatic int
SRGB_SATURATION_PRESERVING
sRGB
: Saturation rendering intentstatic int
sTER
Indicator of Stereo Imagestatic String
STEREO_MODE
sTER
: Indicator of stereo imagestatic int
STEREO_MODE_CROSS
sTER
: Cross-fuse layoutstatic int
STEREO_MODE_DIVERGING
sTER
: Diverging-fuse layoutstatic String
SUGGESTED_PALETTES
sPLT
: List of suggested palettesstatic int
tEXt
Textual datastatic String
TEXT_CHUNKS
static int
tIME
Image last-modification timestatic String
TIME
tIME
: Image last-modification timestatic String
TRANSPARENCY
tRNS
: Transparency samplesstatic int
tRNS
Transparencystatic String
UNIT
pHYs
: Unit specifierstatic int
UNIT_METER
pHYs
: Unit is the meterstatic int
UNIT_UNKNOWN
pHYs
: Unit is unknownstatic String
WIDTH
IHDR
: Widthstatic int
zTXt
Compressed textual data
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Constructor Summary
Constructors Constructor Description PngConstants()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static String
getChunkName(int chunkType)
Returns the four-character ASCII name corresponding to the given chunk type.static int
getChunkType(String chunkName)
Returns the chunk type corresponding to the given four-character ASCII chunk name.static boolean
isAncillary(int chunkType)
Returnstrue
if the given chunk type has the ancillary bit set (the first letter is lowercase).static boolean
isPrivate(int chunkType)
Returnstrue
if the given chunk type has the private bit set (the second letter is lowercase).static boolean
isReserved(int chunkType)
Returnstrue
if the given chunk type has the reserved bit set (the third letter is lowercase).static boolean
isSafeToCopy(int chunkType)
Returnstrue
if the given chunk type has the safe-to-copy bit set (the fourth letter is lowercase).
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Field Detail
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SIGNATURE
public static final long SIGNATURE
Eight byte magic number that begins all PNG images- See Also:
- Constant Field Values
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IHDR
public static final int IHDR
Image header- See Also:
- Constant Field Values
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PLTE
public static final int PLTE
Palette- See Also:
- Constant Field Values
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IDAT
public static final int IDAT
Image data- See Also:
- Constant Field Values
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IEND
public static final int IEND
Image trailer- See Also:
- Constant Field Values
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bKGD
public static final int bKGD
Background color- See Also:
- Constant Field Values
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cHRM
public static final int cHRM
Primary chromaticities- See Also:
- Constant Field Values
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gAMA
public static final int gAMA
Image gamma- See Also:
- Constant Field Values
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hIST
public static final int hIST
Palette histogram- See Also:
- Constant Field Values
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iCCP
public static final int iCCP
Embedded ICC profile- See Also:
- Constant Field Values
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iTXt
public static final int iTXt
International textual data- See Also:
- Constant Field Values
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pHYs
public static final int pHYs
Physical pixel dimensions- See Also:
- Constant Field Values
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sBIT
public static final int sBIT
Significant bits- See Also:
- Constant Field Values
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sPLT
public static final int sPLT
Suggested palette- See Also:
- Constant Field Values
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sRGB
public static final int sRGB
Standard RGB color space- See Also:
- Constant Field Values
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tEXt
public static final int tEXt
Textual data- See Also:
- Constant Field Values
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tIME
public static final int tIME
Image last-modification time- See Also:
- Constant Field Values
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tRNS
public static final int tRNS
Transparency- See Also:
- Constant Field Values
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zTXt
public static final int zTXt
Compressed textual data- See Also:
- Constant Field Values
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oFFs
public static final int oFFs
Image offset- See Also:
- Constant Field Values
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pCAL
public static final int pCAL
Calibration of pixel values- See Also:
- Constant Field Values
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sCAL
public static final int sCAL
Physical scale of image subject- See Also:
- Constant Field Values
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gIFg
public static final int gIFg
GIF Graphic Control Extension- See Also:
- Constant Field Values
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gIFx
public static final int gIFx
GIF Application Extension- See Also:
- Constant Field Values
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sTER
public static final int sTER
Indicator of Stereo Image- See Also:
- Constant Field Values
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BIT_DEPTH
public static final String BIT_DEPTH
IHDR
: Bit depth- See Also:
- Constant Field Values
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COLOR_TYPE
public static final String COLOR_TYPE
IHDR
: Color type- See Also:
- Constant Field Values
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COMPRESSION
public static final String COMPRESSION
IHDR
: Compression method- See Also:
- Constant Field Values
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FILTER
public static final String FILTER
IHDR
: Filter method- See Also:
- Constant Field Values
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GAMMA
public static final String GAMMA
gAMA
: Gamma- See Also:
- Constant Field Values
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WIDTH
public static final String WIDTH
IHDR
: Width- See Also:
- Constant Field Values
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HEIGHT
public static final String HEIGHT
IHDR
: Height- See Also:
- Constant Field Values
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INTERLACE
public static final String INTERLACE
IHDR
: Interlace method- See Also:
- Constant Field Values
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PALETTE
public static final String PALETTE
PLTE
: Palette entries- See Also:
- Constant Field Values
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PALETTE_ALPHA
public static final String PALETTE_ALPHA
PLTE
: Palette alpha- See Also:
- Constant Field Values
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TRANSPARENCY
public static final String TRANSPARENCY
tRNS
: Transparency samples- See Also:
- Constant Field Values
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BACKGROUND
public static final String BACKGROUND
bKGD
: Background samples- See Also:
- Constant Field Values
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PIXELS_PER_UNIT_X
public static final String PIXELS_PER_UNIT_X
pHYs
: Pixels per unit, X axis- See Also:
- Constant Field Values
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PIXELS_PER_UNIT_Y
public static final String PIXELS_PER_UNIT_Y
pHYs
: Pixels per unit, Y axis- See Also:
- Constant Field Values
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RENDERING_INTENT
public static final String RENDERING_INTENT
sRGB
: Rendering intent- See Also:
- Constant Field Values
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SIGNIFICANT_BITS
public static final String SIGNIFICANT_BITS
sBIT
: Significant bits- See Also:
- Constant Field Values
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TEXT_CHUNKS
public static final String TEXT_CHUNKS
- See Also:
- Constant Field Values
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TIME
public static final String TIME
tIME
: Image last-modification time- See Also:
- Constant Field Values
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UNIT
public static final String UNIT
pHYs
: Unit specifier- See Also:
- Constant Field Values
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CHROMATICITY
public static final String CHROMATICITY
cHRM
: Chromaticity- See Also:
- Constant Field Values
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ICC_PROFILE
public static final String ICC_PROFILE
iCCP
: ICC profile- See Also:
- Constant Field Values
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ICC_PROFILE_NAME
public static final String ICC_PROFILE_NAME
iCCP
: ICC profile name- See Also:
- Constant Field Values
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HISTOGRAM
public static final String HISTOGRAM
hIST
: Palette histogram- See Also:
- Constant Field Values
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SUGGESTED_PALETTES
public static final String SUGGESTED_PALETTES
sPLT
: List of suggested palettes- See Also:
- Constant Field Values
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GIF_DISPOSAL_METHOD
public static final String GIF_DISPOSAL_METHOD
gIFg
: GIF disposal method- See Also:
- Constant Field Values
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GIF_USER_INPUT_FLAG
public static final String GIF_USER_INPUT_FLAG
gIFg
: GIF user input flag- See Also:
- Constant Field Values
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GIF_DELAY_TIME
public static final String GIF_DELAY_TIME
gIFg
: GIF delay time (hundredths of a second)- See Also:
- Constant Field Values
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SCALE_UNIT
public static final String SCALE_UNIT
sCAL
: Unit for physical scale of image subject- See Also:
- Constant Field Values
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PIXEL_WIDTH
public static final String PIXEL_WIDTH
sCAL
: Physical width of pixel- See Also:
- Constant Field Values
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PIXEL_HEIGHT
public static final String PIXEL_HEIGHT
sCAL
: Physical height of pixel- See Also:
- Constant Field Values
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POSITION_UNIT
public static final String POSITION_UNIT
oFFs
: Unit for image offset- See Also:
- Constant Field Values
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STEREO_MODE
public static final String STEREO_MODE
sTER
: Indicator of stereo image- See Also:
- Constant Field Values
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COLOR_TYPE_GRAY
public static final int COLOR_TYPE_GRAY
IHDR
: Grayscale color type- See Also:
- Constant Field Values
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COLOR_TYPE_GRAY_ALPHA
public static final int COLOR_TYPE_GRAY_ALPHA
IHDR
: Grayscale+alpha color type- See Also:
- Constant Field Values
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COLOR_TYPE_PALETTE
public static final int COLOR_TYPE_PALETTE
IHDR
: Palette color type- See Also:
- Constant Field Values
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COLOR_TYPE_RGB
public static final int COLOR_TYPE_RGB
IHDR
: RGB color type- See Also:
- Constant Field Values
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COLOR_TYPE_RGB_ALPHA
public static final int COLOR_TYPE_RGB_ALPHA
IHDR
: RGBA color type- See Also:
- Constant Field Values
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INTERLACE_NONE
public static final int INTERLACE_NONE
IHDR
: No interlace- See Also:
- Constant Field Values
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INTERLACE_ADAM7
public static final int INTERLACE_ADAM7
IHDR
: Adam7 interlace- See Also:
- Constant Field Values
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FILTER_BASE
public static final int FILTER_BASE
IHDR
: Adaptive filtering- See Also:
- Constant Field Values
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COMPRESSION_BASE
public static final int COMPRESSION_BASE
IHDR
: Deflate/inflate compression- See Also:
- Constant Field Values
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UNIT_UNKNOWN
public static final int UNIT_UNKNOWN
pHYs
: Unit is unknown- See Also:
- Constant Field Values
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UNIT_METER
public static final int UNIT_METER
pHYs
: Unit is the meter- See Also:
- Constant Field Values
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SRGB_PERCEPTUAL
public static final int SRGB_PERCEPTUAL
sRGB
: Perceptual rendering intent- See Also:
- Constant Field Values
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SRGB_RELATIVE_COLORIMETRIC
public static final int SRGB_RELATIVE_COLORIMETRIC
sRGB
: Relative colorimetric rendering intent- See Also:
- Constant Field Values
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SRGB_SATURATION_PRESERVING
public static final int SRGB_SATURATION_PRESERVING
sRGB
: Saturation rendering intent- See Also:
- Constant Field Values
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SRGB_ABSOLUTE_COLORIMETRIC
public static final int SRGB_ABSOLUTE_COLORIMETRIC
sRGB
: Absolute colormetric rendering intent- See Also:
- Constant Field Values
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POSITION_X
public static final String POSITION_X
oFFs
: Image X position- See Also:
- Constant Field Values
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POSITION_Y
public static final String POSITION_Y
oFFs
: Image Y position- See Also:
- Constant Field Values
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POSITION_UNIT_PIXEL
public static final int POSITION_UNIT_PIXEL
oFFs
: Unit is the pixel (true dimensions unspecified)- See Also:
- Constant Field Values
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POSITION_UNIT_MICROMETER
public static final int POSITION_UNIT_MICROMETER
oFFs
: Unit is the micrometer (10^-6 meter)- See Also:
- Constant Field Values
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SCALE_UNIT_METER
public static final int SCALE_UNIT_METER
sCAL
: Unit is the meter- See Also:
- Constant Field Values
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SCALE_UNIT_RADIAN
public static final int SCALE_UNIT_RADIAN
sCAL
: Unit is the radian- See Also:
- Constant Field Values
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STEREO_MODE_CROSS
public static final int STEREO_MODE_CROSS
sTER
: Cross-fuse layout- See Also:
- Constant Field Values
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STEREO_MODE_DIVERGING
public static final int STEREO_MODE_DIVERGING
sTER
: Diverging-fuse layout- See Also:
- Constant Field Values
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Method Detail
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isAncillary
public static boolean isAncillary(int chunkType)
Returnstrue
if the given chunk type has the ancillary bit set (the first letter is lowercase). An ancillary chunk is once which is not strictly necessary in order to meaningfully display the contents of the file.- Parameters:
chunkType
- the chunk type- Returns:
- whether the chunk type ancillary bit is set
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isPrivate
public static boolean isPrivate(int chunkType)
Returnstrue
if the given chunk type has the private bit set (the second letter is lowercase). All unregistered chunk types should have this bit set.- Parameters:
chunkType
- the chunk type- Returns:
- whether the chunk type private bit is set
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isReserved
public static boolean isReserved(int chunkType)
Returnstrue
if the given chunk type has the reserved bit set (the third letter is lowercase). The meaning of this bit is currently undefined, but reserved for future use. Images conforming to the current version of the PNG specification must not have this bit set.- Parameters:
chunkType
- the chunk type- Returns:
- whether the chunk type reserved bit is set
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isSafeToCopy
public static boolean isSafeToCopy(int chunkType)
Returnstrue
if the given chunk type has the safe-to-copy bit set (the fourth letter is lowercase). Chunks marked as safe-to-copy may be copied to a modified PNG file whether or not the software recognizes the chunk type.- Parameters:
chunkType
- the chunk type- Returns:
- whether the chunk safe-to-copy bit is set
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getChunkName
public static String getChunkName(int chunkType)
Returns the four-character ASCII name corresponding to the given chunk type. For example,PngConstants.getChunkName(PngConstants.IHDR)
will return"IHDR"
.- Parameters:
chunkType
- the chunk type- Returns:
- the four-character ASCII chunk name
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getChunkType
public static int getChunkType(String chunkName)
Returns the chunk type corresponding to the given four-character ASCII chunk name.- Parameters:
chunkName
- the four-character ASCII chunk name- Returns:
- the chunk type
- Throws:
NullPointerException
- ifname
is nullIndexOutOfBoundsException
- ifname
has less than four characters
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