mxPngEncodeParam (jgraphx 4.1.0)

java.lang.Object
- com.mxgraph.util.png.mxPngEncodeParam

Direct Known Subclasses:

mxPngEncodeParam.Gray, mxPngEncodeParam.Palette, mxPngEncodeParam.RGB
```
public abstract class mxPngEncodeParam
extends java.lang.Object
```
An instance of ImageEncodeParam for encoding images in the PNG format.
This class is not a committed part of the JAI API. It may be removed or changed in future releases of JAI.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class mxPngEncodeParam.Gray

static class mxPngEncodeParam.Palette

static class mxPngEncodeParam.RGB

Nested Classes
Modifier and Type	Class and Description
`static class`	`mxPngEncodeParam.Gray`
`static class`	`mxPngEncodeParam.Palette`
`static class`	`mxPngEncodeParam.RGB`

Field Summary

Fields
Modifier and Type	Field and Description
`protected int`	`bitDepth`
`protected boolean`	`bitDepthSet`
`static int`	`INTENT_ABSOLUTE` Constant for use with the sRGB chunk.
`static int`	`INTENT_PERCEPTUAL` Constant for use with the sRGB chunk.
`static int`	`INTENT_RELATIVE` Constant for use with the sRGB chunk.
`static int`	`INTENT_SATURATION` Constant for use with the sRGB chunk.
`static int`	`PNG_FILTER_AVERAGE` Constant for use in filtering.
`static int`	`PNG_FILTER_NONE` Constant for use in filtering.
`static int`	`PNG_FILTER_PAETH` Constant for use in filtering.
`static int`	`PNG_FILTER_SUB` Constant for use in filtering.
`static int`	`PNG_FILTER_UP` Constant for use in filtering.

Constructor Summary

Constructors
Constructor and Description

mxPngEncodeParam()

Constructors
Constructor and Description
`mxPngEncodeParam()`

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`addPrivateChunk(java.lang.String type, byte[] data)` Adds a private chunk, in binary form, to the list of chunks to be stored with this image.
`int`	`filterRow(byte[] currRow, byte[] prevRow, byte[][] scratchRows, int bytesPerRow, int bytesPerPixel)` Performs filtering on a row of an image.
`int`	`getBitDepth()` Returns the desired bit depth for a grayscale image.
`float[]`	`getChromaticity()` Returns the white point and primary chromaticities in CIE (x, y) space.
`java.lang.String[]`	`getCompressedText()` Returns the text strings to be stored in compressed form with this image as an array of `String`s.
`static mxPngEncodeParam`	`getDefaultEncodeParam(java.awt.image.RenderedImage im)` Returns an instance of `PNGEncodeParam.Palette`, `PNGEncodeParam.Gray`, or `PNGEncodeParam.RGB` appropriate for encoding the given image.
`float`	`getGamma()` Returns the file gamma value for the image.
`byte[]`	`getICCProfileData()` Returns the ICC profile data to be stored with this image.
`boolean`	`getInterlacing()` Returns `true` if Adam7 interlacing will be used.
`java.util.Date`	`getModificationTime()` Returns the modification time to be stored with this image.
`int`	`getNumPrivateChunks()` Returns the number of private chunks to be written to the output file.
`int[]`	`getPaletteHistogram()` Returns the palette histogram to be stored with this image.
`int[]`	`getPhysicalDimension()` Returns the physical dimension information to be stored with this image.
`byte[]`	`getPrivateChunkData(int index)` Returns the data associated of the private chunk at a given index, as an array of `byte`s.
`java.lang.String`	`getPrivateChunkType(int index)` Returns the type of the private chunk at a given index, as a 4-character `String`.
`int[]`	`getSignificantBits()` Returns the number of significant bits for each band of the image.
`int`	`getSRGBIntent()` Returns the sRGB rendering intent to be stored with this image.
`java.lang.String[]`	`getText()` Returns the text strings to be stored in uncompressed form with this image as an array of `String`s.
`boolean`	`isBackgroundSet()` Returns true if a 'bKGD' chunk will be output.
`boolean`	`isChromaticitySet()` Returns true if a 'cHRM' chunk will be output.
`boolean`	`isCompressedTextSet()` Returns true if a 'zTXT' chunk will be output.
`boolean`	`isGammaSet()` Returns true if a 'gAMA' chunk will be output.
`boolean`	`isICCProfileDataSet()` Returns true if a 'iCCP' chunk will be output.
`boolean`	`isModificationTimeSet()` Returns true if a 'tIME' chunk will be output.
`boolean`	`isPaletteHistogramSet()` Returns true if a 'hIST' chunk will be output.
`boolean`	`isPhysicalDimensionSet()` Returns true if a 'pHYS' chunk will be output.
`boolean`	`isSignificantBitsSet()` Returns true if an 'sBIT' chunk will be output.
`boolean`	`isSRGBIntentSet()` Returns true if an 'sRGB' chunk will be output.
`boolean`	`isSuggestedPaletteSet()` Returns true if a 'sPLT' chunk will be output.
`boolean`	`isTextSet()` Returns true if a 'tEXt' chunk will be output.
`boolean`	`isTransparencySet()` Returns true if a 'tRNS' chunk will be output.
`static int`	`paethPredictor(int a, int b, int c)` The Paeth predictor routine used in PNG encoding.
`void`	`removeAllPrivateChunks()` Remove all private chunks associated with this parameter instance.
`void`	`removeUnsafeToCopyPrivateChunks()` Remove all private chunks associated with this parameter instance whose 'safe-to-copy' bit is not set.
`abstract void`	`setBitDepth(int bitDepth)` Sets the desired bit depth of an image.
`void`	`setChromaticity(float[] chromaticity)` Sets the white point and primary chromaticities in CIE (x, y) space.
`void`	`setChromaticity(float whitePointX, float whitePointY, float redX, float redY, float greenX, float greenY, float blueX, float blueY)` A convenience method that calls the array version.
`void`	`setCompressedText(java.lang.String[] text)` Sets the text strings to be stored in compressed form with this image.
`void`	`setGamma(float gamma)` Sets the file gamma value for the image.
`void`	`setICCProfileData(byte[] ICCProfileData)` Sets the ICC profile data to be stored with this image.
`void`	`setInterlacing(boolean useInterlacing)` Turns Adam7 interlacing on or off.
`void`	`setModificationTime(java.util.Date modificationTime)` Sets the modification time, as a `Date`, to be stored with this image.
`void`	`setPaletteHistogram(int[] paletteHistogram)` Sets the palette histogram to be stored with this image.
`void`	`setPhysicalDimension(int[] physicalDimension)` Sets the physical dimension information to be stored with this image.
`void`	`setPhysicalDimension(int xPixelsPerUnit, int yPixelsPerUnit, int unitSpecifier)` A convenience method that calls the array version.
`void`	`setSignificantBits(int[] significantBits)` Sets the number of significant bits for each band of the image.
`void`	`setSRGBIntent(int SRGBIntent)` Sets the sRGB rendering intent to be stored with this image.
`void`	`setSuggestedPalette(mxPngSuggestedPaletteEntry[] palette)` Sets the suggested palette information to be stored with this image.
`void`	`setText(java.lang.String[] text)` Sets the textual data to be stored in uncompressed form with this image.
`void`	`unsetBackground()` Suppresses the 'bKGD' chunk from being output.
`void`	`unsetBitDepth()` Suppresses the setting of the bit depth of a grayscale image.
`void`	`unsetChromaticity()` Suppresses the 'cHRM' chunk from being output.
`void`	`unsetCompressedText()` Suppresses the 'zTXt' chunk from being output.
`void`	`unsetGamma()` Suppresses the 'gAMA' chunk from being output.
`void`	`unsetICCProfileData()` Suppresses the 'iCCP' chunk from being output.
`void`	`unsetModificationTime()` Suppresses the 'tIME' chunk from being output.
`void`	`unsetPaletteHistogram()` Suppresses the 'hIST' chunk from being output.
`void`	`unsetPhysicalDimension()` Suppresses the 'pHYS' chunk from being output.
`void`	`unsetSignificantBits()` Suppresses the 'sBIT' chunk from being output.
`void`	`unsetSRGBIntent()` Suppresses the 'sRGB' chunk from being output.
`void`	`unsetSuggestedPalette()` Suppresses the 'sPLT' chunk from being output.
`void`	`unsetText()` Suppresses the 'tEXt' chunk from being output.
`void`	`unsetTransparency()` Suppresses the 'tRNS' chunk from being output.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - INTENT_PERCEPTUAL
```
public static final int INTENT_PERCEPTUAL
```
    Constant for use with the sRGB chunk.
    
    See Also:
    
    Constant Field Values
  - INTENT_RELATIVE
```
public static final int INTENT_RELATIVE
```
    Constant for use with the sRGB chunk.
    
    See Also:
    
    Constant Field Values
  - INTENT_SATURATION
```
public static final int INTENT_SATURATION
```
    Constant for use with the sRGB chunk.
    
    See Also:
    
    Constant Field Values
  - INTENT_ABSOLUTE
```
public static final int INTENT_ABSOLUTE
```
    Constant for use with the sRGB chunk.
    
    See Also:
    
    Constant Field Values
  - PNG_FILTER_NONE
```
public static final int PNG_FILTER_NONE
```
    Constant for use in filtering.
    
    See Also:
    
    Constant Field Values
  - PNG_FILTER_SUB
```
public static final int PNG_FILTER_SUB
```
    Constant for use in filtering.
    
    See Also:
    
    Constant Field Values
  - PNG_FILTER_UP
```
public static final int PNG_FILTER_UP
```
    Constant for use in filtering.
    
    See Also:
    
    Constant Field Values
  - PNG_FILTER_AVERAGE
```
public static final int PNG_FILTER_AVERAGE
```
    Constant for use in filtering.
    
    See Also:
    
    Constant Field Values
  - PNG_FILTER_PAETH
```
public static final int PNG_FILTER_PAETH
```
    Constant for use in filtering.
    
    See Also:
    
    Constant Field Values
  - bitDepth
```
protected int bitDepth
```
  - bitDepthSet
```
protected boolean bitDepthSet
```
- Constructor Detail
  - mxPngEncodeParam
```
public mxPngEncodeParam()
```
- Method Detail
  - getDefaultEncodeParam
```
public static mxPngEncodeParam getDefaultEncodeParam(java.awt.image.RenderedImage im)
```
    Returns an instance of PNGEncodeParam.Palette, PNGEncodeParam.Gray, or PNGEncodeParam.RGB appropriate for encoding the given image.
    If the image has an IndexColorModel, an instance of PNGEncodeParam.Palette is returned. Otherwise, if the image has 1 or 2 bands an instance of PNGEncodeParam.Gray is returned. In all other cases an instance of PNGEncodeParam.RGB is returned.
    Note that this method does not provide any guarantee that the given image will be successfully encoded by the PNG encoder, as it only performs a very superficial analysis of the image structure.
  - setBitDepth
```
public abstract void setBitDepth(int bitDepth)
```
    Sets the desired bit depth of an image.
  - getBitDepth
```
public int getBitDepth()
```
    Returns the desired bit depth for a grayscale image.
    If the bit depth has not previously been set, or has been unset, an IllegalStateException will be thrown.
    
    Throws:
    
    java.lang.IllegalStateException - if the bit depth is not set.
  - unsetBitDepth
```
public void unsetBitDepth()
```
    Suppresses the setting of the bit depth of a grayscale image. The depth of the encoded image will be inferred from the source image bit depth, rounded up to the next power of 2 between 1 and 16.
  - setInterlacing
```
public void setInterlacing(boolean useInterlacing)
```
    Turns Adam7 interlacing on or off.
  - getInterlacing
```
public boolean getInterlacing()
```
    Returns true if Adam7 interlacing will be used.
  - unsetBackground
```
public void unsetBackground()
```
    Suppresses the 'bKGD' chunk from being output. For API compatibility with JAI 1.0, the superclass defines this method to throw a RuntimeException; accordingly, subclasses must provide their own implementations.
  - isBackgroundSet
```
public boolean isBackgroundSet()
```
    Returns true if a 'bKGD' chunk will be output. For API compatibility with JAI 1.0, the superclass defines this method to throw a RuntimeException; accordingly, subclasses must provide their own implementations.
  - setChromaticity
```
public void setChromaticity(float[] chromaticity)
```
    Sets the white point and primary chromaticities in CIE (x, y) space.
    The chromaticity parameter should be a float array of length 8 containing the white point X and Y, red X and Y, green X and Y, and blue X and Y values in order.
    The 'cHRM' chunk will encode this information.
  - setChromaticity
```
public void setChromaticity(float whitePointX,
                            float whitePointY,
                            float redX,
                            float redY,
                            float greenX,
                            float greenY,
                            float blueX,
                            float blueY)
```
    A convenience method that calls the array version.
  - getChromaticity
```
public float[] getChromaticity()
```
    Returns the white point and primary chromaticities in CIE (x, y) space.
    See the documentation for the setChromaticity method for the format of the returned data.
    If the chromaticity has not previously been set, or has been unset, an IllegalStateException will be thrown.
    
    Throws:
    
    java.lang.IllegalStateException - if the chromaticity is not set.
  - unsetChromaticity
```
public void unsetChromaticity()
```
    Suppresses the 'cHRM' chunk from being output.
  - isChromaticitySet
```
public boolean isChromaticitySet()
```
    Returns true if a 'cHRM' chunk will be output.
  - setGamma
```
public void setGamma(float gamma)
```
    Sets the file gamma value for the image.
    The 'gAMA' chunk will encode this information.
  - getGamma
```
public float getGamma()
```
    Returns the file gamma value for the image.
    If the file gamma has not previously been set, or has been unset, an IllegalStateException will be thrown.
    
    Throws:
    
    java.lang.IllegalStateException - if the gamma is not set.
  - unsetGamma
```
public void unsetGamma()
```
    Suppresses the 'gAMA' chunk from being output.
  - isGammaSet
```
public boolean isGammaSet()
```
    Returns true if a 'gAMA' chunk will be output.
  - setPaletteHistogram
```
public void setPaletteHistogram(int[] paletteHistogram)
```
    Sets the palette histogram to be stored with this image. The histogram consists of an array of integers, one per palette entry.
    The 'hIST' chunk will encode this information.
  - getPaletteHistogram
```
public int[] getPaletteHistogram()
```
    Returns the palette histogram to be stored with this image.
    If the histogram has not previously been set, or has been unset, an IllegalStateException will be thrown.
    
    Throws:
    
    java.lang.IllegalStateException - if the histogram is not set.
  - unsetPaletteHistogram
```
public void unsetPaletteHistogram()
```
    Suppresses the 'hIST' chunk from being output.
  - isPaletteHistogramSet
```
public boolean isPaletteHistogramSet()
```
    Returns true if a 'hIST' chunk will be output.
  - setICCProfileData
```
public void setICCProfileData(byte[] ICCProfileData)
```
    Sets the ICC profile data to be stored with this image. The profile is represented in raw binary form.
    The 'iCCP' chunk will encode this information.
  - getICCProfileData
```
public byte[] getICCProfileData()
```
    Returns the ICC profile data to be stored with this image.
    If the ICC profile has not previously been set, or has been unset, an IllegalStateException will be thrown.
    
    Throws:
    
    java.lang.IllegalStateException - if the ICC profile is not set.
  - unsetICCProfileData
```
public void unsetICCProfileData()
```
    Suppresses the 'iCCP' chunk from being output.
  - isICCProfileDataSet
```
public boolean isICCProfileDataSet()
```
    Returns true if a 'iCCP' chunk will be output.
  - setPhysicalDimension
```
public void setPhysicalDimension(int[] physicalDimension)
```
    Sets the physical dimension information to be stored with this image. The physicalDimension parameter should be a 3-entry array containing the number of pixels per unit in the X direction, the number of pixels per unit in the Y direction, and the unit specifier (0 = unknown, 1 = meters).
    The 'pHYS' chunk will encode this information.
  - setPhysicalDimension
```
public void setPhysicalDimension(int xPixelsPerUnit,
                                 int yPixelsPerUnit,
                                 int unitSpecifier)
```
    A convenience method that calls the array version.
  - getPhysicalDimension
```
public int[] getPhysicalDimension()
```
    Returns the physical dimension information to be stored with this image.
    If the physical dimension information has not previously been set, or has been unset, an IllegalStateException will be thrown.
    
    Throws:
    
    java.lang.IllegalStateException - if the physical dimension information is not set.
  - unsetPhysicalDimension
```
public void unsetPhysicalDimension()
```
    Suppresses the 'pHYS' chunk from being output.
  - isPhysicalDimensionSet
```
public boolean isPhysicalDimensionSet()
```
    Returns true if a 'pHYS' chunk will be output.
  - setSuggestedPalette
```
public void setSuggestedPalette(mxPngSuggestedPaletteEntry[] palette)
```
    Sets the suggested palette information to be stored with this image. The information is passed to this method as an array of PNGSuggestedPaletteEntry objects.
    The 'sPLT' chunk will encode this information.
  - unsetSuggestedPalette
```
public void unsetSuggestedPalette()
```
    Suppresses the 'sPLT' chunk from being output.
  - isSuggestedPaletteSet
```
public boolean isSuggestedPaletteSet()
```
    Returns true if a 'sPLT' chunk will be output.
  - setSignificantBits
```
public void setSignificantBits(int[] significantBits)
```
    Sets the number of significant bits for each band of the image.
    The number of entries in the significantBits array must be equal to the number of output bands in the image: 1 for a gray image, 2 for gray+alpha, 3 for index or truecolor, and 4 for truecolor+alpha.
    The 'sBIT' chunk will encode this information.
  - getSignificantBits
```
public int[] getSignificantBits()
```
    Returns the number of significant bits for each band of the image.
    If the significant bits values have not previously been set, or have been unset, an IllegalStateException will be thrown.
    
    Throws:
    
    java.lang.IllegalStateException - if the significant bits values are not set.
  - unsetSignificantBits
```
public void unsetSignificantBits()
```
    Suppresses the 'sBIT' chunk from being output.
  - isSignificantBitsSet
```
public boolean isSignificantBitsSet()
```
    Returns true if an 'sBIT' chunk will be output.
  - setSRGBIntent
```
public void setSRGBIntent(int SRGBIntent)
```
    Sets the sRGB rendering intent to be stored with this image. The legal values are 0 = Perceptual, 1 = Relative Colorimetric, 2 = Saturation, and 3 = Absolute Colorimetric. Refer to the PNG specification for information on these values.
    The 'sRGB' chunk will encode this information.
  - getSRGBIntent
```
public int getSRGBIntent()
```
    Returns the sRGB rendering intent to be stored with this image.
    If the sRGB intent has not previously been set, or has been unset, an IllegalStateException will be thrown.
    
    Throws:
    
    java.lang.IllegalStateException - if the sRGB intent is not set.
  - unsetSRGBIntent
```
public void unsetSRGBIntent()
```
    Suppresses the 'sRGB' chunk from being output.
  - isSRGBIntentSet
```
public boolean isSRGBIntentSet()
```
    Returns true if an 'sRGB' chunk will be output.
  - setText
```
public void setText(java.lang.String[] text)
```
    Sets the textual data to be stored in uncompressed form with this image. The data is passed to this method as an array of Strings.
    The 'tEXt' chunk will encode this information.
  - getText
```
public java.lang.String[] getText()
```
    Returns the text strings to be stored in uncompressed form with this image as an array of Strings.
    If the text strings have not previously been set, or have been unset, an IllegalStateException will be thrown.
    
    Throws:
    
    java.lang.IllegalStateException - if the text strings are not set.
  - unsetText
```
public void unsetText()
```
    Suppresses the 'tEXt' chunk from being output.
  - isTextSet
```
public boolean isTextSet()
```
    Returns true if a 'tEXt' chunk will be output.
  - setModificationTime
```
public void setModificationTime(java.util.Date modificationTime)
```
    Sets the modification time, as a Date, to be stored with this image. The internal storage format will use UTC regardless of how the modificationTime parameter was created.
    The 'tIME' chunk will encode this information.
  - getModificationTime
```
public java.util.Date getModificationTime()
```
    Returns the modification time to be stored with this image.
    If the bit depth has not previously been set, or has been unset, an IllegalStateException will be thrown.
    
    Throws:
    
    java.lang.IllegalStateException - if the bit depth is not set.
  - unsetModificationTime
```
public void unsetModificationTime()
```
    Suppresses the 'tIME' chunk from being output.
  - isModificationTimeSet
```
public boolean isModificationTimeSet()
```
    Returns true if a 'tIME' chunk will be output.
  - unsetTransparency
```
public void unsetTransparency()
```
    Suppresses the 'tRNS' chunk from being output.
  - isTransparencySet
```
public boolean isTransparencySet()
```
    Returns true if a 'tRNS' chunk will be output.
  - setCompressedText
```
public void setCompressedText(java.lang.String[] text)
```
    Sets the text strings to be stored in compressed form with this image. The data is passed to this method as an array of Strings.
    The 'zTXt' chunk will encode this information.
  - getCompressedText
```
public java.lang.String[] getCompressedText()
```
    Returns the text strings to be stored in compressed form with this image as an array of Strings.
    If the compressed text strings have not previously been set, or have been unset, an IllegalStateException will be thrown.
    
    Throws:
    
    java.lang.IllegalStateException - if the compressed text strings are not set.
  - unsetCompressedText
```
public void unsetCompressedText()
```
    Suppresses the 'zTXt' chunk from being output.
  - isCompressedTextSet
```
public boolean isCompressedTextSet()
```
    Returns true if a 'zTXT' chunk will be output.
  - addPrivateChunk
```
public void addPrivateChunk(java.lang.String type,
                            byte[] data)
```
    Adds a private chunk, in binary form, to the list of chunks to be stored with this image.
    
    Parameters:
    
    type - a 4-character String giving the chunk type name.
    
    data - an array of bytes containing the chunk data.
  - getNumPrivateChunks
```
public int getNumPrivateChunks()
```
    Returns the number of private chunks to be written to the output file.
  - getPrivateChunkType
```
public java.lang.String getPrivateChunkType(int index)
```
    Returns the type of the private chunk at a given index, as a 4-character String. The index must be smaller than the return value of getNumPrivateChunks.
  - getPrivateChunkData
```
public byte[] getPrivateChunkData(int index)
```
    Returns the data associated of the private chunk at a given index, as an array of bytes. The index must be smaller than the return value of getNumPrivateChunks.
  - removeUnsafeToCopyPrivateChunks
```
public void removeUnsafeToCopyPrivateChunks()
```
    Remove all private chunks associated with this parameter instance whose 'safe-to-copy' bit is not set. This may be advisable when transcoding PNG images.
  - removeAllPrivateChunks
```
public void removeAllPrivateChunks()
```
    Remove all private chunks associated with this parameter instance.
  - paethPredictor
```
public static final int paethPredictor(int a,
                                       int b,
                                       int c)
```
    The Paeth predictor routine used in PNG encoding. This routine is included as a convenience to subclasses that override the filterRow method.
  - filterRow
```
public int filterRow(byte[] currRow,
                     byte[] prevRow,
                     byte[][] scratchRows,
                     int bytesPerRow,
                     int bytesPerPixel)
```
    Performs filtering on a row of an image. This method may be overridden in order to provide a custom algorithm for choosing the filter type for a given row.
    The method is supplied with the current and previous rows of the image. For the first row of the image, or of an interlacing pass, the previous row array will be filled with zeros as required by the PNG specification.
    The method is also supplied with five scratch arrays. These arrays may be used within the method for any purpose. At method exit, the array at the index given by the return value of the method should contain the filtered data. The return value will also be used as the filter type.
    The default implementation of the method performs a trial encoding with each of the filter types, and computes the sum of absolute values of the differences between the raw bytes of the current row and the predicted values. The index of the filter producing the smallest result is returned.
    As an example, to perform only 'sub' filtering, this method could be implemented (non-optimally) as follows:
```
 for (int i = bytesPerPixel; i < bytesPerRow + bytesPerPixel; i++) {
     int curr = currRow[i] & 0xff;
     int left = currRow[i - bytesPerPixel] & 0xff;
     scratchRow[PNG_FILTER_SUB][i] = (byte)(curr - left);
 }
 return PNG_FILTER_SUB;
 
```
    Parameters:
    
    currRow - The current row as an array of bytes of length at least bytesPerRow + bytesPerPixel. The pixel data starts at index bytesPerPixel; the initial bytesPerPixel bytes are zero.
    
    prevRow - The current row as an array of bytes The pixel data starts at index bytesPerPixel; the initial bytesPerPixel bytes are zero.
    
    scratchRows - An array of 5 byte arrays of length at least bytesPerRow + bytesPerPixel, useable to hold temporary results. The filtered row will be returned as one of the entries of this array. The returned filtered data should start at index bytesPerPixel; The initial bytesPerPixel bytes are not used.
    
    bytesPerRow - The number of bytes in the image row. This value will always be greater than 0.
    
    bytesPerPixel - The number of bytes representing a single pixel, rounded up to an integer. This is the 'bpp' parameter described in the PNG specification.
    
    Returns:
    
    The filter type to be used. The entry of scratchRows[] at this index holds the filtered data.

Class mxPngEncodeParam

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

INTENT_PERCEPTUAL

INTENT_RELATIVE

INTENT_SATURATION

INTENT_ABSOLUTE

PNG_FILTER_NONE

PNG_FILTER_SUB

PNG_FILTER_UP

PNG_FILTER_AVERAGE

PNG_FILTER_PAETH

bitDepth

bitDepthSet

Constructor Detail

mxPngEncodeParam

Method Detail

getDefaultEncodeParam

setBitDepth

getBitDepth

unsetBitDepth

setInterlacing

getInterlacing

unsetBackground

isBackgroundSet

setChromaticity

setChromaticity

getChromaticity

unsetChromaticity

isChromaticitySet

setGamma

getGamma

unsetGamma

isGammaSet

setPaletteHistogram

getPaletteHistogram

unsetPaletteHistogram

isPaletteHistogramSet

setICCProfileData

getICCProfileData

unsetICCProfileData

isICCProfileDataSet

setPhysicalDimension

setPhysicalDimension

getPhysicalDimension

unsetPhysicalDimension

isPhysicalDimensionSet

setSuggestedPalette

unsetSuggestedPalette

isSuggestedPaletteSet

setSignificantBits

getSignificantBits

unsetSignificantBits

isSignificantBitsSet

setSRGBIntent

getSRGBIntent

unsetSRGBIntent

isSRGBIntentSet

setText

getText

unsetText

isTextSet

setModificationTime

getModificationTime

unsetModificationTime

isModificationTimeSet

unsetTransparency

isTransparencySet

setCompressedText

getCompressedText

unsetCompressedText

isCompressedTextSet

addPrivateChunk

getNumPrivateChunks

getPrivateChunkType

getPrivateChunkData