kiteqr/io.github.yuroyami.kiteqr/GrayscaleLuminanceSource

GrayscaleLuminanceSource

open class GrayscaleLuminanceSource : LuminanceSource

This class is used to help decode images from files which arrive as a grayscale pixel array.

Inheritors

RGBLuminanceSource

Constructors

GrayscaleLuminanceSource

constructor(width: Int, height: Int, pixels: ByteArray)

Functions

crop

open override fun crop(left: Int, top: Int, width: Int, height: Int): 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.

getHeight

fun getHeight(): Int

getMatrix

open override fun getMatrix(): ByteArray

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

getRow

open override fun getRow(y: Int, row: ByteArray?): ByteArray

Fetches one row of luminance data from the underlying platform's bitmap. Values range from 0 (black) to 255 (white). Because Kotlin 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.

getWidth

fun getWidth(): Int

invert

open fun invert(): LuminanceSource

isCropSupported

open override fun isCropSupported(): Boolean

isRotateSupported

open override fun isRotateSupported(): Boolean

rotateCounterClockwise

open override fun rotateCounterClockwise(): LuminanceSource

Returns a new object with rotated image data by 90 degrees counterclockwise. Only callable if isRotateSupported is true.

rotateCounterClockwise45

open fun rotateCounterClockwise45(): LuminanceSource

Returns a new object with rotated image data by 45 degrees counterclockwise. Only callable if isRotateSupported is true.

toString

open override fun toString(): String