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94 lines
2.5 KiB
94 lines
2.5 KiB
/*
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Ported to JavaScript by Lazar Laszlo 2011
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lazarsoft@gmail.com, www.lazarsoft.info
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*/
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/*
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*
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* Copyright 2007 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 {URShift} from './qrcode';
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export default function BitMatrix(width, height) {
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if (!height)
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height = width;
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if (width < 1 || height < 1) {
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throw "Both dimensions must be greater than 0";
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}
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this.width = width;
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this.height = height;
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var rowSize = width >> 5;
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if ((width & 0x1f) != 0) {
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rowSize++;
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}
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this.rowSize = rowSize;
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this.bits = new Array(rowSize * height);
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for (var i = 0; i < this.bits.length; i++)
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this.bits[i] = 0;
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}
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Object.defineProperty(BitMatrix.prototype, "Dimension", {
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get: function() {
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if (this.width != this.height) {
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throw "Can't call getDimension() on a non-square matrix";
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}
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return this.width;
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}
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});
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BitMatrix.prototype.get_Renamed = function(x, y) {
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var offset = y * this.rowSize + (x >> 5);
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return ((URShift(this.bits[offset], (x & 0x1f))) & 1) != 0;
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};
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BitMatrix.prototype.set_Renamed = function(x, y) {
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var offset = y * this.rowSize + (x >> 5);
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this.bits[offset] |= 1 << (x & 0x1f);
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};
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BitMatrix.prototype.flip = function(x, y) {
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var offset = y * this.rowSize + (x >> 5);
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this.bits[offset] ^= 1 << (x & 0x1f);
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};
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BitMatrix.prototype.clear = function() {
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var max = this.bits.length;
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for (var i = 0; i < max; i++) {
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this.bits[i] = 0;
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}
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};
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BitMatrix.prototype.setRegion = function(left, top, width, height) {
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if (top < 0 || left < 0) {
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throw "Left and top must be nonnegative";
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}
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if (height < 1 || width < 1) {
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throw "Height and width must be at least 1";
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}
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var right = left + width;
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var bottom = top + height;
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if (bottom > this.height || right > this.width) {
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throw "The region must fit inside the matrix";
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}
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for (var y = top; y < bottom; y++) {
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var offset = y * this.rowSize;
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for (var x = left; x < right; x++) {
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this.bits[offset + (x >> 5)] |= 1 << (x & 0x1f);
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}
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}
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};
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