@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
153 lines (152 loc) • 6.97 kB
JavaScript
/*
* 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.
*/
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
/*namespace com.google.zxing {*/
import System from './util/System';
import LuminanceSource from './LuminanceSource';
import InvertedLuminanceSource from './InvertedLuminanceSource';
import IllegalArgumentException from './IllegalArgumentException';
/**
* This object extends LuminanceSource around an array of YUV data returned from the camera driver,
* with the option to crop to a rectangle within the full data. This can be used to exclude
* superfluous pixels around the perimeter and speed up decoding.
*
* It works for any pixel format where the Y channel is planar and appears first, including
* YCbCr_420_SP and YCbCr_422_SP.
*
* @author dswitkin@google.com (Daniel Switkin)
*/
var PlanarYUVLuminanceSource = /** @class */ (function (_super) {
__extends(PlanarYUVLuminanceSource, _super);
function PlanarYUVLuminanceSource(yuvData, dataWidth /*int*/, dataHeight /*int*/, left /*int*/, top /*int*/, width /*int*/, height /*int*/, reverseHorizontal) {
var _this = _super.call(this, width, height) || this;
_this.yuvData = yuvData;
_this.dataWidth = dataWidth;
_this.dataHeight = dataHeight;
_this.left = left;
_this.top = top;
if (left + width > dataWidth || top + height > dataHeight) {
throw new IllegalArgumentException('Crop rectangle does not fit within image data.');
}
if (reverseHorizontal) {
_this.reverseHorizontal(width, height);
}
return _this;
}
/*@Override*/
PlanarYUVLuminanceSource.prototype.getRow = function (y /*int*/, row) {
if (y < 0 || y >= this.getHeight()) {
throw new IllegalArgumentException('Requested row is outside the image: ' + y);
}
var width = this.getWidth();
if (row === null || row === undefined || row.length < width) {
row = new Uint8ClampedArray(width);
}
var offset = (y + this.top) * this.dataWidth + this.left;
System.arraycopy(this.yuvData, offset, row, 0, width);
return row;
};
/*@Override*/
PlanarYUVLuminanceSource.prototype.getMatrix = function () {
var width = this.getWidth();
var height = this.getHeight();
// If the caller asks for the entire underlying image, save the copy and give them the
// original data. The docs specifically warn that result.length must be ignored.
if (width === this.dataWidth && height === this.dataHeight) {
return this.yuvData;
}
var area = width * height;
var matrix = new Uint8ClampedArray(area);
var inputOffset = this.top * this.dataWidth + this.left;
// If the width matches the full width of the underlying data, perform a single copy.
if (width === this.dataWidth) {
System.arraycopy(this.yuvData, inputOffset, matrix, 0, area);
return matrix;
}
// Otherwise copy one cropped row at a time.
for (var y = 0; y < height; y++) {
var outputOffset = y * width;
System.arraycopy(this.yuvData, inputOffset, matrix, outputOffset, width);
inputOffset += this.dataWidth;
}
return matrix;
};
/*@Override*/
PlanarYUVLuminanceSource.prototype.isCropSupported = function () {
return true;
};
/*@Override*/
PlanarYUVLuminanceSource.prototype.crop = function (left /*int*/, top /*int*/, width /*int*/, height /*int*/) {
return new PlanarYUVLuminanceSource(this.yuvData, this.dataWidth, this.dataHeight, this.left + left, this.top + top, width, height, false);
};
PlanarYUVLuminanceSource.prototype.renderThumbnail = function () {
var width = this.getWidth() / PlanarYUVLuminanceSource.THUMBNAIL_SCALE_FACTOR;
var height = this.getHeight() / PlanarYUVLuminanceSource.THUMBNAIL_SCALE_FACTOR;
var pixels = new Int32Array(width * height);
var yuv = this.yuvData;
var inputOffset = this.top * this.dataWidth + this.left;
for (var y = 0; y < height; y++) {
var outputOffset = y * width;
for (var x = 0; x < width; x++) {
var grey = yuv[inputOffset + x * PlanarYUVLuminanceSource.THUMBNAIL_SCALE_FACTOR] & 0xff;
pixels[outputOffset + x] = 0xFF000000 | (grey * 0x00010101);
}
inputOffset += this.dataWidth * PlanarYUVLuminanceSource.THUMBNAIL_SCALE_FACTOR;
}
return pixels;
};
/**
* @return width of image from {@link #renderThumbnail()}
*/
PlanarYUVLuminanceSource.prototype.getThumbnailWidth = function () {
return this.getWidth() / PlanarYUVLuminanceSource.THUMBNAIL_SCALE_FACTOR;
};
/**
* @return height of image from {@link #renderThumbnail()}
*/
PlanarYUVLuminanceSource.prototype.getThumbnailHeight = function () {
return this.getHeight() / PlanarYUVLuminanceSource.THUMBNAIL_SCALE_FACTOR;
};
PlanarYUVLuminanceSource.prototype.reverseHorizontal = function (width /*int*/, height /*int*/) {
var yuvData = this.yuvData;
for (var y = 0, rowStart = this.top * this.dataWidth + this.left; y < height; y++, rowStart += this.dataWidth) {
var middle = rowStart + width / 2;
for (var x1 = rowStart, x2 = rowStart + width - 1; x1 < middle; x1++, x2--) {
var temp = yuvData[x1];
yuvData[x1] = yuvData[x2];
yuvData[x2] = temp;
}
}
};
PlanarYUVLuminanceSource.prototype.invert = function () {
return new InvertedLuminanceSource(this);
};
PlanarYUVLuminanceSource.THUMBNAIL_SCALE_FACTOR = 2;
return PlanarYUVLuminanceSource;
}(LuminanceSource));
export default PlanarYUVLuminanceSource;