How to use
filterRow
method
in
org.apache.batik.ext.awt.image.codec.png.PNGEncodeParam

Best Java code snippets using org.apache.batik.ext.awt.image.codec.png.PNGEncodeParam.filterRow (Showing top 4 results out of 315)

int filterType = param.filterRow(currRow, prevRow,
                 filteredRows,
                 bytesPerRow, bpp);

int filterType = param.filterRow(currRow, prevRow,
                 filteredRows,
                 bytesPerRow, bpp);

int filterType = param.filterRow(currRow, prevRow,
                 filteredRows,
                 bytesPerRow, bpp);

int filterType = param.filterRow(currRow, prevRow,
                 filteredRows,
                 bytesPerRow, bpp);

Javadoc

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;

Popular methods of PNGEncodeParam

abs
An abs() function for use by the Paeth predictor.
addPrivateChunk
Adds a private chunk, in binary form, to the list of chunks to be stored with this image.
getChromaticity
Returns the white point and primary chromaticities in CIE (x, y) space. See the documentation for th
getCompressedText
Returns the text strings to be stored in compressed form with this image as an array of Strings. If
getDefaultEncodeParam
Returns an instance of PNGEncodeParam.Palette,PNGEncodeParam.Gray, or PNGEncodeParam.RGB appropriate
getGamma
Returns the file gamma value for the image. If the file gamma has not previously been set, or has be
getICCProfileData
Returns the ICC profile data to be stored with this image. If the ICC profile has not previously bee
getInterlacing
Returns true if Adam7 interlacing will be used.
getModificationTime
Returns the modification time to be stored with this image. If the bit depth has not previously been
getNumPrivateChunks
Returns the number of private chunks to be written to the output file.
getPaletteHistogram
Returns the palette histogram to be stored with this image. If the histogram has not previously been
getPhysicalDimension
Returns the physical dimension information to be stored with this image. If the physical dimension i

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How to use filterRowmethodin org.apache.batik.ext.awt.image.codec.png.PNGEncodeParam

Best Java code snippets using org.apache.batik.ext.awt.image.codec.png.PNGEncodeParam.filterRow (Showing top 4 results out of 315)

How to use
filterRow
method
in
org.apache.batik.ext.awt.image.codec.png.PNGEncodeParam