Struct rxing::BufferedImageLuminanceSource

pub struct BufferedImageLuminanceSource { /* private fields */ }

This LuminanceSource implementation is meant for J2SE clients and our blackbox unit tests.

@author dswitkin@google.com (Daniel Switkin) @author Sean Owen @author code@elektrowolle.de (Wolfgang Jung)

Implementations

impl BufferedImageLuminanceSource

pub fn new(image: DynamicImage) -> Self

pub fn with_details(
    image: DynamicImage,
    left: u32,
    top: u32,
    width: usize,
    height: usize
) -> Self

Trait Implementations

impl LuminanceSource for BufferedImageLuminanceSource

fn getRow(&self, y: usize) -> Vec<u8>

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.

fn getMatrix(&self) -> Vec<u8>

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

fn getWidth(&self) -> usize

@return The width of the bitmap.

fn getHeight(&self) -> usize

@return The height of the bitmap.

fn invert(&mut self)

@return a wrapper of this {@code LuminanceSource} which inverts the luminances it returns – black becomes white and vice versa, and each value becomes (255-value).

fn isCropSupported(&self) -> bool

@return Whether this subclass supports cropping.

fn crop(
    &self,
    left: usize,
    top: usize,
    width: usize,
    height: usize
) -> Result<Box<dyn LuminanceSource>, Exceptions>

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.

fn isRotateSupported(&self) -> bool

@return Whether this subclass supports counter-clockwise rotation.

fn rotateCounterClockwise(&self) -> Result<Box<dyn LuminanceSource>, Exceptions>

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

fn rotateCounterClockwise45(
    &self
) -> Result<Box<dyn LuminanceSource>, Exceptions>

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

fn invert_block_of_bytes(&self, vec_to_invert: Vec<u8>) -> Vec<u8>