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118 lines
3.7 KiB
118 lines
3.7 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 BitMatrix from './bitmat';
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var GridSampler = {};
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GridSampler.checkAndNudgePoints = function(image, points) {
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var width = image.width;
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var height = image.height;
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// Check and nudge points from start until we see some that are OK:
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var nudged = true;
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for (var offset = 0; offset < points.length && nudged; offset += 2) {
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var x = Math.floor(points[offset]);
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var y = Math.floor(points[offset + 1]);
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if (x < -1 || x > width || y < -1 || y > height) {
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throw "Error.checkAndNudgePoints ";
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}
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nudged = false;
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if (x == -1) {
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points[offset] = 0.0;
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nudged = true;
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} else if (x == width) {
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points[offset] = width - 1;
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nudged = true;
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}
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if (y == -1) {
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points[offset + 1] = 0.0;
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nudged = true;
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} else if (y == height) {
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points[offset + 1] = height - 1;
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nudged = true;
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}
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}
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// Check and nudge points from end:
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nudged = true;
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for (var offset = points.length - 2; offset >= 0 && nudged; offset -= 2) {
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var x = Math.floor(points[offset]);
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var y = Math.floor(points[offset + 1]);
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if (x < -1 || x > width || y < -1 || y > height) {
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throw "Error.checkAndNudgePoints ";
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}
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nudged = false;
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if (x == -1) {
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points[offset] = 0.0;
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nudged = true;
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} else if (x == width) {
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points[offset] = width - 1;
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nudged = true;
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}
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if (y == -1) {
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points[offset + 1] = 0.0;
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nudged = true;
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} else if (y == height) {
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points[offset + 1] = height - 1;
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nudged = true;
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}
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}
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};
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GridSampler.sampleGrid3 = function(image, dimension, transform) {
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var bits = new BitMatrix(dimension);
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var points = new Array(dimension << 1);
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for (var y = 0; y < dimension; y++) {
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var max = points.length;
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var iValue = y + 0.5;
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for (var x = 0; x < max; x += 2) {
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points[x] = (x >> 1) + 0.5;
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points[x + 1] = iValue;
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}
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transform.transformPoints1(points);
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// Quick check to see if points transformed to something inside the image
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// sufficient to check the endpoints
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GridSampler.checkAndNudgePoints(image, points);
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try {
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for (var x = 0; x < max; x += 2) {
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var bit = image.data[Math.floor(points[x]) + image.width * Math.floor(points[x + 1])];
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if (bit)
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bits.set_Renamed(x >> 1, y);
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}
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} catch (aioobe) {
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// This feels wrong, but, sometimes if the finder patterns are misidentified, the resulting
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// transform gets "twisted" such that it maps a straight line of points to a set of points
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// whose endpoints are in bounds, but others are not. There is probably some mathematical
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// way to detect this about the transformation that I don't know yet.
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// This results in an ugly runtime exception despite our clever checks above -- can't have
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// that. We could check each point's coordinates but that feels duplicative. We settle for
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// catching and wrapping ArrayIndexOutOfBoundsException.
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throw "Error.checkAndNudgePoints";
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}
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}
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return bits;
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};
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export default GridSampler;
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