Class Optimum
java.lang.Object
org.apache.pdfbox.pdmodel.graphics.predictor.PredictorAlgorithm
org.apache.pdfbox.pdmodel.graphics.predictor.Optimum
In an Uptimum encoded image, each line takes up width*bpp+1 bytes. The first
byte holds a number that signifies which algorithm encoded the line.
- Version:
- $Revision: 1.1 $
- Author:
- xylifyx@yahoo.co.uk
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
checkBufsiz
(byte[] filtered, byte[] raw) check that buffer sizes matches width,height,bpp.void
decode
(byte[] src, byte[] dest) decode a byte array full of image data using the filter that this object implements.void
decodeLine
(byte[] src, byte[] dest, int srcDy, int srcOffset, int destDy, int destOffset) decode line of pixel data in src from src_offset and width*bpp bytes forward, put the decoded bytes into dest.void
encode
(byte[] src, byte[] dest) encode a byte array full of image data using the filter that this object implements.void
encodeLine
(byte[] src, byte[] dest, int srcDy, int srcOffset, int destDy, int destOffset) encode line of pixel data in src from srcOffset and width*bpp bytes forward, put the decoded bytes into dest.void
setBpp
(int bpp) void
setHeight
(int height) void
setWidth
(int width) Methods inherited from class org.apache.pdfbox.pdmodel.graphics.predictor.PredictorAlgorithm
aboveLeftPixel, abovePixel, getBpp, getFilter, getHeight, getWidth, leftPixel, main
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Constructor Details
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Optimum
public Optimum()
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Method Details
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checkBufsiz
public void checkBufsiz(byte[] filtered, byte[] raw) check that buffer sizes matches width,height,bpp. This implementation is used by most of the filters, but not Uptimum.- Overrides:
checkBufsiz
in classPredictorAlgorithm
- Parameters:
filtered
- The source buffer.raw
- The destination buffer.
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encodeLine
public void encodeLine(byte[] src, byte[] dest, int srcDy, int srcOffset, int destDy, int destOffset) encode line of pixel data in src from srcOffset and width*bpp bytes forward, put the decoded bytes into dest.- Specified by:
encodeLine
in classPredictorAlgorithm
- Parameters:
src
- raw image datadest
- encoded datasrcDy
- byte offset between linessrcOffset
- beginning of line datadestDy
- byte offset between linesdestOffset
- beginning of line data
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decodeLine
public void decodeLine(byte[] src, byte[] dest, int srcDy, int srcOffset, int destDy, int destOffset) decode line of pixel data in src from src_offset and width*bpp bytes forward, put the decoded bytes into dest.- Specified by:
decodeLine
in classPredictorAlgorithm
- Parameters:
src
- encoded image datadest
- raw datasrcDy
- byte offset between linessrcOffset
- beginning of line datadestDy
- byte offset between linesdestOffset
- beginning of line data
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encode
public void encode(byte[] src, byte[] dest) encode a byte array full of image data using the filter that this object implements.- Overrides:
encode
in classPredictorAlgorithm
- Parameters:
src
- bufferdest
- buffer
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setBpp
public void setBpp(int bpp) - Overrides:
setBpp
in classPredictorAlgorithm
- Parameters:
bpp
- The bpp to set.
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setHeight
public void setHeight(int height) - Overrides:
setHeight
in classPredictorAlgorithm
- Parameters:
height
- The height to set.
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setWidth
public void setWidth(int width) - Overrides:
setWidth
in classPredictorAlgorithm
- Parameters:
width
- The width to set.
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decode
public void decode(byte[] src, byte[] dest) decode a byte array full of image data using the filter that this object implements.- Overrides:
decode
in classPredictorAlgorithm
- Parameters:
src
- bufferdest
- buffer
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