@zxing/library
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TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
91 lines (90 loc) • 4.64 kB
JavaScript
;
/*
* Copyright 2007 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 __());
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
/*namespace com.google.zxing.common {*/
var GridSampler_1 = require("./GridSampler");
var BitMatrix_1 = require("./BitMatrix");
var PerspectiveTransform_1 = require("./PerspectiveTransform");
var NotFoundException_1 = require("../NotFoundException");
/**
* @author Sean Owen
*/
var DefaultGridSampler = /** @class */ (function (_super) {
__extends(DefaultGridSampler, _super);
function DefaultGridSampler() {
return _super !== null && _super.apply(this, arguments) || this;
}
/*@Override*/
DefaultGridSampler.prototype.sampleGrid = function (image, dimensionX /*int*/, dimensionY /*int*/, p1ToX /*float*/, p1ToY /*float*/, p2ToX /*float*/, p2ToY /*float*/, p3ToX /*float*/, p3ToY /*float*/, p4ToX /*float*/, p4ToY /*float*/, p1FromX /*float*/, p1FromY /*float*/, p2FromX /*float*/, p2FromY /*float*/, p3FromX /*float*/, p3FromY /*float*/, p4FromX /*float*/, p4FromY /*float*/) {
var transform = PerspectiveTransform_1.default.quadrilateralToQuadrilateral(p1ToX, p1ToY, p2ToX, p2ToY, p3ToX, p3ToY, p4ToX, p4ToY, p1FromX, p1FromY, p2FromX, p2FromY, p3FromX, p3FromY, p4FromX, p4FromY);
return this.sampleGridWithTransform(image, dimensionX, dimensionY, transform);
};
/*@Override*/
DefaultGridSampler.prototype.sampleGridWithTransform = function (image, dimensionX /*int*/, dimensionY /*int*/, transform) {
if (dimensionX <= 0 || dimensionY <= 0) {
throw new NotFoundException_1.default();
}
var bits = new BitMatrix_1.default(dimensionX, dimensionY);
var points = new Float32Array(2 * dimensionX);
for (var y = 0; y < dimensionY; y++) {
var max = points.length;
var iValue = y + 0.5;
for (var x = 0; x < max; x += 2) {
points[x] = (x / 2) + 0.5;
points[x + 1] = iValue;
}
transform.transformPoints(points);
// Quick check to see if points transformed to something inside the image
// sufficient to check the endpoints
GridSampler_1.default.checkAndNudgePoints(image, points);
try {
for (var x = 0; x < max; x += 2) {
if (image.get(Math.floor(points[x]), Math.floor(points[x + 1]))) {
// Black(-ish) pixel
bits.set(x / 2, y);
}
}
}
catch (aioobe /*: ArrayIndexOutOfBoundsException*/) {
// This feels wrong, but, sometimes if the finder patterns are misidentified, the resulting
// transform gets "twisted" such that it maps a straight line of points to a set of points
// whose endpoints are in bounds, but others are not. There is probably some mathematical
// way to detect this about the transformation that I don't know yet.
// This results in an ugly runtime exception despite our clever checks above -- can't have
// that. We could check each point's coordinates but that feels duplicative. We settle for
// catching and wrapping ArrayIndexOutOfBoundsException.
throw new NotFoundException_1.default();
}
}
return bits;
};
return DefaultGridSampler;
}(GridSampler_1.default));
exports.default = DefaultGridSampler;