/*
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* Copyright 2009 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import IllegalArgumentException from './IllegalArgumentException';
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export default class BinaryBitmap {
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constructor(binarizer) {
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this.binarizer = binarizer;
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if (binarizer === null) {
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throw new IllegalArgumentException('Binarizer must be non-null.');
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}
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}
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/**
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* @return The width of the bitmap.
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*/
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getWidth() {
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return this.binarizer.getWidth();
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}
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/**
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* @return The height of the bitmap.
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*/
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getHeight() {
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return this.binarizer.getHeight();
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}
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/**
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* Converts one row of luminance data to 1 bit data. May actually do the conversion, or return
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* cached data. Callers should assume this method is expensive and call it as seldom as possible.
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* This method is intended for decoding 1D barcodes and may choose to apply sharpening.
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*
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* @param y The row to fetch, which must be in [0, bitmap height)
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* @param row An optional preallocated array. If null or too small, it will be ignored.
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* If used, the Binarizer will call BitArray.clear(). Always use the returned object.
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* @return The array of bits for this row (true means black).
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* @throws NotFoundException if row can't be binarized
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*/
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getBlackRow(y /*int*/, row) {
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return this.binarizer.getBlackRow(y, row);
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}
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/**
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* Converts a 2D array of luminance data to 1 bit. As above, assume this method is expensive
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* and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or
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* may not apply sharpening. Therefore, a row from this matrix may not be identical to one
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* fetched using getBlackRow(), so don't mix and match between them.
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*
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* @return The 2D array of bits for the image (true means black).
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* @throws NotFoundException if image can't be binarized to make a matrix
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*/
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getBlackMatrix() {
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// The matrix is created on demand the first time it is requested, then cached. There are two
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// reasons for this:
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// 1. This work will never be done if the caller only installs 1D Reader objects, or if a
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// 1D Reader finds a barcode before the 2D Readers run.
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// 2. This work will only be done once even if the caller installs multiple 2D Readers.
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if (this.matrix === null || this.matrix === undefined) {
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this.matrix = this.binarizer.getBlackMatrix();
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}
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return this.matrix;
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}
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/**
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* @return Whether this bitmap can be cropped.
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*/
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isCropSupported() {
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return this.binarizer.getLuminanceSource().isCropSupported();
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}
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/**
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* Returns a new object with cropped image data. Implementations may keep a reference to the
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* original data rather than a copy. Only callable if isCropSupported() is true.
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*
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* @param left The left coordinate, which must be in [0,getWidth())
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* @param top The top coordinate, which must be in [0,getHeight())
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* @param width The width of the rectangle to crop.
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* @param height The height of the rectangle to crop.
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* @return A cropped version of this object.
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*/
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crop(left /*int*/, top /*int*/, width /*int*/, height /*int*/) {
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const newSource = this.binarizer.getLuminanceSource().crop(left, top, width, height);
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return new BinaryBitmap(this.binarizer.createBinarizer(newSource));
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}
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/**
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* @return Whether this bitmap supports counter-clockwise rotation.
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*/
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isRotateSupported() {
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return this.binarizer.getLuminanceSource().isRotateSupported();
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}
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/**
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* Returns a new object with rotated image data by 90 degrees counterclockwise.
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* Only callable if {@link #isRotateSupported()} is true.
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*
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* @return A rotated version of this object.
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*/
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rotateCounterClockwise() {
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const newSource = this.binarizer.getLuminanceSource().rotateCounterClockwise();
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return new BinaryBitmap(this.binarizer.createBinarizer(newSource));
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}
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/**
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* Returns a new object with rotated image data by 45 degrees counterclockwise.
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* Only callable if {@link #isRotateSupported()} is true.
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*
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* @return A rotated version of this object.
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*/
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rotateCounterClockwise45() {
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const newSource = this.binarizer.getLuminanceSource().rotateCounterClockwise45();
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return new BinaryBitmap(this.binarizer.createBinarizer(newSource));
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}
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/*@Override*/
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toString() {
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try {
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return this.getBlackMatrix().toString();
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}
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catch (e /*: NotFoundException*/) {
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return '';
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}
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}
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}
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