Class InvertedLuminanceSource

Namespace

ZXing

Assembly

zxing.dll

A wrapper implementation of {@link LuminanceSource} which inverts the luminances it returns -- black becomes white and vice versa, and each value becomes (255-value).

public sealed class InvertedLuminanceSource : LuminanceSource

Inheritance

object

LuminanceSource

InvertedLuminanceSource

Inherited Members

LuminanceSource.ToString()

LuminanceSource.Width

LuminanceSource.Height

LuminanceSource.InversionSupported

object.GetType()

object.Equals(object)

object.Equals(object, object)

object.ReferenceEquals(object, object)

object.GetHashCode()

Constructors

InvertedLuminanceSource(LuminanceSource)

Initializes a new instance of the InvertedLuminanceSource class.

public InvertedLuminanceSource(LuminanceSource @delegate)

Parameters

delegate LuminanceSource

The @delegate.

Properties

CropSupported

public override bool CropSupported { get; }

Property Value

bool

Whether this subclass supports cropping.

Matrix

Fetches luminance data for the underlying bitmap. Values should be fetched using: int luminance = array[y * width + x] & 0xff;

public override byte[] Matrix { get; }

Property Value

byte[]

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.

RotateSupported

public override bool RotateSupported { get; }

Property Value

bool

Whether this subclass supports counter-clockwise rotation.

Methods

crop(int, int, int, int)

Returns a new object with cropped image data. Implementations may keep a reference to the original data rather than a copy. Only callable if CropSupported is true.

public override LuminanceSource crop(int left, int top, int width, int height)

Parameters

left int

The left coordinate, 0 <= left < Width.

top int

The top coordinate, 0 <= top <= Height.

width int

The width of the rectangle to crop.

height int

The height of the rectangle to crop.

Returns

LuminanceSource

A cropped version of this object.

getRow(int, byte[])

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.

public override byte[] getRow(int y, byte[] row)

Parameters

y int

The row to fetch, 0 <= y < Height.

row byte[]

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

byte[]

An array containing the luminance data.

invert()

Inverts this instance.

public override LuminanceSource invert()

Returns

LuminanceSource

original delegate {@link LuminanceSource} since invert undoes itself

rotateCounterClockwise()

Returns a new object with rotated image data by 90 degrees counterclockwise. Only callable if {@link #isRotateSupported()} is true.

public override LuminanceSource rotateCounterClockwise()

Returns

LuminanceSource

A rotated version of this object.

rotateCounterClockwise45()

Returns a new object with rotated image data by 45 degrees counterclockwise. Only callable if {@link #isRotateSupported()} is true.

public override LuminanceSource rotateCounterClockwise45()

Returns

LuminanceSource

A rotated version of this object.