Struct 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

Trait Implementations

impl LuminanceSource for BufferedImageLuminanceSource

const SUPPORTS_CROP: bool = true

const SUPPORTS_ROTATION: bool = true

fn get_row(&self, y: usize) -> Option<Cow<'_, [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 get_column(&self, x: usize) -> Vec<u8>

Get a column of of the image

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

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

fn get_width(&self) -> usize

@return The width of the bitmap.

fn get_height(&self) -> usize

@return The height of the bitmap.

fn crop( &self, left: usize, top: usize, width: usize, height: usize, ) -> Result<Self>

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 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 rotate_counter_clockwise(&self) -> Result<Self>

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

fn rotate_counter_clockwise_45(&self) -> Result<Self>

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

fn get_luma8_point(&self, x: usize, y: usize) -> u8

fn is_crop_supported(&self) -> bool

@return Whether this subclass supports cropping.

fn is_rotate_supported(&self) -> bool

@return Whether this subclass supports counter-clockwise rotation.

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