Package com.google.zxing.client.j2se
Class BufferedImageLuminanceSource
- java.lang.Object
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- com.google.zxing.LuminanceSource
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- com.google.zxing.client.j2se.BufferedImageLuminanceSource
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public final class BufferedImageLuminanceSource extends LuminanceSource
This LuminanceSource implementation is meant for J2SE clients and our blackbox unit tests.
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Field Summary
Fields Modifier and Type Field Description private java.awt.image.BufferedImage
image
private int
left
private static double
MINUS_45_IN_RADIANS
private int
top
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Constructor Summary
Constructors Constructor Description BufferedImageLuminanceSource(java.awt.image.BufferedImage image)
BufferedImageLuminanceSource(java.awt.image.BufferedImage image, int left, int top, int width, int height)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description LuminanceSource
crop(int left, int top, int width, int height)
Returns a new object with cropped image data.byte[]
getMatrix()
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.boolean
isCropSupported()
boolean
isRotateSupported()
This is always true, since the image is a gray-scale image.LuminanceSource
rotateCounterClockwise()
Returns a new object with rotated image data by 90 degrees counterclockwise.LuminanceSource
rotateCounterClockwise45()
Returns a new object with rotated image data by 45 degrees counterclockwise.-
Methods inherited from class com.google.zxing.LuminanceSource
getHeight, getWidth, invert, toString
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Field Detail
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MINUS_45_IN_RADIANS
private static final double MINUS_45_IN_RADIANS
- See Also:
- Constant Field Values
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image
private final java.awt.image.BufferedImage image
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left
private final int left
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top
private final int top
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Method Detail
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getRow
public byte[] getRow(int y, byte[] row)
Description copied from class:LuminanceSource
Fetches 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:
getRow
in classLuminanceSource
- 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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getMatrix
public byte[] getMatrix()
Description copied from class:LuminanceSource
Fetches luminance data for the underlying bitmap. Values should be fetched using:int luminance = array[y * width + x] & 0xff
- Specified by:
getMatrix
in classLuminanceSource
- 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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isCropSupported
public boolean isCropSupported()
- Overrides:
isCropSupported
in classLuminanceSource
- Returns:
- Whether this subclass supports cropping.
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crop
public LuminanceSource crop(int left, int top, int width, int height)
Description copied from class:LuminanceSource
Returns 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:
crop
in classLuminanceSource
- 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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isRotateSupported
public boolean isRotateSupported()
This is always true, since the image is a gray-scale image.- Overrides:
isRotateSupported
in classLuminanceSource
- Returns:
- true
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rotateCounterClockwise
public LuminanceSource rotateCounterClockwise()
Description copied from class:LuminanceSource
Returns a new object with rotated image data by 90 degrees counterclockwise. Only callable ifLuminanceSource.isRotateSupported()
is true.- Overrides:
rotateCounterClockwise
in classLuminanceSource
- Returns:
- A rotated version of this object.
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rotateCounterClockwise45
public LuminanceSource rotateCounterClockwise45()
Description copied from class:LuminanceSource
Returns a new object with rotated image data by 45 degrees counterclockwise. Only callable ifLuminanceSource.isRotateSupported()
is true.- Overrides:
rotateCounterClockwise45
in classLuminanceSource
- Returns:
- A rotated version of this object.
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