Package com.google.zxing
Class InvertedLuminanceSource
java.lang.Object
com.google.zxing.LuminanceSource
com.google.zxing.InvertedLuminanceSource
A wrapper implementation of 
LuminanceSource which inverts the luminances it returns -- black becomes
 white and vice versa, and each value becomes (255-value).- Author:
- Sean Owen
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Constructor SummaryConstructors
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Method SummaryModifier and TypeMethodDescriptioncrop(int left, int top, int width, int height) Returns a new object with cropped image data.byte[]Fetches luminance data for the underlying bitmap.byte[]getRow(int y, byte[] row) Fetches one row of luminance data from the underlying platform's bitmap.invert()booleanbooleanReturns a new object with rotated image data by 90 degrees counterclockwise.Returns a new object with rotated image data by 45 degrees counterclockwise.Methods inherited from class com.google.zxing.LuminanceSourcegetHeight, getWidth, toString
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Constructor Details- 
InvertedLuminanceSource
 
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Method Details- 
getRowpublic byte[] getRow(int y, byte[] row) Description copied from class:LuminanceSourceFetches one row of luminance data from the underlying platform's bitmap. Values range from 0 (black) to 255 (white). Because Java does not have an unsigned byte type, callers will have to bitwise and with 0xff for each value. It is preferable for implementations of this method to only fetch this row rather than the whole image, since no 2D Readers may be installed and getMatrix() may never be called.- Specified by:
- getRowin class- LuminanceSource
- Parameters:
- y- The row to fetch, which must be in [0,getHeight())
- row- An optional preallocated array. If null or too small, it will be ignored. Always use the returned object, and ignore the .length of the array.
- Returns:
- An array containing the luminance data.
 
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getMatrixpublic byte[] getMatrix()Description copied from class:LuminanceSourceFetches luminance data for the underlying bitmap. Values should be fetched using:int luminance = array[y * width + x] & 0xff- Specified by:
- getMatrixin class- LuminanceSource
- Returns:
- A row-major 2D array of luminance values. Do not use result.length as it may be larger than width * height bytes on some platforms. Do not modify the contents of the result.
 
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isCropSupportedpublic boolean isCropSupported()- Overrides:
- isCropSupportedin class- LuminanceSource
- Returns:
- Whether this subclass supports cropping.
 
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cropDescription copied from class:LuminanceSourceReturns a new object with cropped image data. Implementations may keep a reference to the original data rather than a copy. Only callable if isCropSupported() is true.- Overrides:
- cropin class- LuminanceSource
- Parameters:
- left- The left coordinate, which must be in [0,getWidth())
- top- The top coordinate, which must be in [0,getHeight())
- width- The width of the rectangle to crop.
- height- The height of the rectangle to crop.
- Returns:
- A cropped version of this object.
 
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isRotateSupportedpublic boolean isRotateSupported()- Overrides:
- isRotateSupportedin class- LuminanceSource
- Returns:
- Whether this subclass supports counter-clockwise rotation.
 
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invert- Overrides:
- invertin class- LuminanceSource
- Returns:
- original delegate LuminanceSourcesince invert undoes itself
 
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rotateCounterClockwiseDescription copied from class:LuminanceSourceReturns a new object with rotated image data by 90 degrees counterclockwise. Only callable ifLuminanceSource.isRotateSupported()is true.- Overrides:
- rotateCounterClockwisein class- LuminanceSource
- Returns:
- A rotated version of this object.
 
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rotateCounterClockwise45Description copied from class:LuminanceSourceReturns a new object with rotated image data by 45 degrees counterclockwise. Only callable ifLuminanceSource.isRotateSupported()is true.- Overrides:
- rotateCounterClockwise45in class- LuminanceSource
- Returns:
- A rotated version of this object.
 
 
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