mirror of https://github.com/NekoX-Dev/NekoX.git
151 lines
5.2 KiB
Java
Executable File
151 lines
5.2 KiB
Java
Executable File
/*
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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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package com.google.zxing;
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import com.google.zxing.common.BitArray;
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import com.google.zxing.common.BitMatrix;
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/**
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* This class is the core bitmap class used by ZXing to represent 1 bit data. Reader objects
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* accept a BinaryBitmap and attempt to decode it.
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*
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* @author dswitkin@google.com (Daniel Switkin)
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*/
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public final class BinaryBitmap {
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private final Binarizer binarizer;
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private BitMatrix matrix;
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public BinaryBitmap(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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this.binarizer = binarizer;
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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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public int getWidth() {
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return 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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public int getHeight() {
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return 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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public BitArray getBlackRow(int y, BitArray row) throws NotFoundException {
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return 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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public BitMatrix getBlackMatrix() throws NotFoundException {
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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 (matrix == null) {
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matrix = binarizer.getBlackMatrix();
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}
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return 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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public boolean isCropSupported() {
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return 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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public BinaryBitmap crop(int left, int top, int width, int height) {
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LuminanceSource newSource = binarizer.getLuminanceSource().crop(left, top, width, height);
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return new BinaryBitmap(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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public boolean isRotateSupported() {
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return 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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public BinaryBitmap rotateCounterClockwise() {
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LuminanceSource newSource = binarizer.getLuminanceSource().rotateCounterClockwise();
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return new BinaryBitmap(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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public BinaryBitmap rotateCounterClockwise45() {
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LuminanceSource newSource = binarizer.getLuminanceSource().rotateCounterClockwise45();
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return new BinaryBitmap(binarizer.createBinarizer(newSource));
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}
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@Override
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public String toString() {
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try {
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return getBlackMatrix().toString();
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} catch (NotFoundException e) {
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return "";
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}
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}
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}
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