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/*
* Copyright 2009 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//package com.google.zxing;
use std::{borrow::Cow, fmt};
use crate::{
common::{BitArray, BitMatrix, Result},
Binarizer, LuminanceSource,
};
/**
* This class is the core bitmap class used by ZXing to represent 1 bit data. Reader objects
* accept a BinaryBitmap and attempt to decode it.
*
* @author dswitkin@google.com (Daniel Switkin)
*/
pub struct BinaryBitmap<B: Binarizer> {
binarizer: B,
matrix: Option<BitMatrix>,
}
impl<B: Binarizer> BinaryBitmap<B> {
pub fn new(binarizer: B) -> Self {
Self {
matrix: None,
binarizer,
}
}
/**
* @return The width of the bitmap.
*/
pub fn get_width(&self) -> usize {
self.binarizer.get_width()
}
/**
* @return The height of the bitmap.
*/
pub fn get_height(&self) -> usize {
self.binarizer.get_height()
}
/**
* Converts one row of luminance data to 1 bit data. May actually do the conversion, or return
* cached data. Callers should assume this method is expensive and call it as seldom as possible.
* This method is intended for decoding 1D barcodes and may choose to apply sharpening.
*
* @param y The row to fetch, which must be in [0, bitmap height)
* @param row An optional preallocated array. If null or too small, it will be ignored.
* If used, the Binarizer will call BitArray.clear(). Always use the returned object.
* @return The array of bits for this row (true means black).
* @throws NotFoundException if row can't be binarized
*/
pub fn get_black_row(&self, y: usize) -> Result<Cow<BitArray>> {
self.binarizer.get_black_row(y)
}
/**
* Converts a 2D array of luminance data to 1 bit. As above, assume this method is expensive
* and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or
* may not apply sharpening. Therefore, a row from this matrix may not be identical to one
* fetched using getBlackRow(), so don't mix and match between them.
*
* Panics if the binarizer cannot be created.
*
* @return The 2D array of bits for the image (true means black).
* @throws NotFoundException if image can't be binarized to make a matrix
*/
pub fn get_black_matrix_mut(&mut self) -> &mut BitMatrix {
// The matrix is created on demand the first time it is requested, then cached. There are two
// reasons for this:
// 1. This work will never be done if the caller only installs 1D Reader objects, or if a
// 1D Reader finds a barcode before the 2D Readers run.
// 2. This work will only be done once even if the caller installs multiple 2D Readers.
if self.matrix.is_none() {
self.matrix = Some(self.binarizer.get_black_matrix().unwrap().clone());
}
self.matrix.as_mut().unwrap()
}
/**
* Converts a 2D array of luminance data to 1 bit. As above, assume this method is expensive
* and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or
* may not apply sharpening. Therefore, a row from this matrix may not be identical to one
* fetched using getBlackRow(), so don't mix and match between them.
*
* Panics if the binarizer cannot be created.
*
* @return The 2D array of bits for the image (true means black).
* @throws NotFoundException if image can't be binarized to make a matrix
*/
pub fn get_black_matrix(&mut self) -> &BitMatrix {
// The matrix is created on demand the first time it is requested, then cached. There are two
// reasons for this:
// 1. This work will never be done if the caller only installs 1D Reader objects, or if a
// 1D Reader finds a barcode before the 2D Readers run.
// 2. This work will only be done once even if the caller installs multiple 2D Readers.
if self.matrix.is_none() {
self.matrix = Some(self.binarizer.get_black_matrix().unwrap().clone())
}
self.matrix.as_ref().unwrap()
}
/**
* @return Whether this bitmap can be cropped.
*/
pub fn is_crop_supported(&self) -> bool {
self.binarizer.get_luminance_source().is_crop_supported()
}
/**
* 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.
*
* Panics if the binarizer cannot be created.
*
* @param left The left coordinate, which must be in [0,getWidth())
* @param top The top coordinate, which must be in [0,getHeight())
* @param width The width of the rectangle to crop.
* @param height The height of the rectangle to crop.
* @return A cropped version of this object.
*/
pub fn crop(&mut self, left: usize, top: usize, width: usize, height: usize) -> Self {
let newSource = self
.binarizer
.get_luminance_source()
.crop(left, top, width, height);
BinaryBitmap::new(
self.binarizer
.create_binarizer(newSource.expect("new lum source expected")),
)
}
/**
* @return Whether this bitmap supports counter-clockwise rotation.
*/
pub fn is_rotate_supported(&self) -> bool {
return self.binarizer.get_luminance_source().is_rotate_supported();
}
/**
* Returns a new object with rotated image data by 90 degrees counterclockwise.
* Only callable if {@link #isRotateSupported()} is true.
*
* Panics if the binarizer cannot be created.
*
* @return A rotated version of this object.
*/
pub fn rotate_counter_clockwise(&mut self) -> Self {
let newSource = self
.binarizer
.get_luminance_source()
.rotate_counter_clockwise();
BinaryBitmap::new(
self.binarizer
.create_binarizer(newSource.expect("new lum source expected")),
)
}
/**
* Returns a new object with rotated image data by 45 degrees counterclockwise.
* Only callable if {@link #isRotateSupported()} is true.
*
* Panics if the binarizer cannot be created.
*
* @return A rotated version of this object.
*/
pub fn rotate_counter_clockwise_45(&self) -> Self {
let newSource = self
.binarizer
.get_luminance_source()
.rotate_counter_clockwise_45();
BinaryBitmap::new(
self.binarizer
.create_binarizer(newSource.expect("new lum source expected")),
)
}
}
impl<B: Binarizer> fmt::Display for BinaryBitmap<B> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{:?}", self.matrix)
}
}