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152 lines
4.5 KiB
152 lines
4.5 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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var GridSampler = {};
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GridSampler.checkAndNudgePoints=function( image, points)
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{
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var width = qrcode.width;
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var height = qrcode.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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{
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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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{
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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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{
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points[offset] = 0.0;
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nudged = true;
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}
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else if (x == width)
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{
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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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{
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points[offset + 1] = 0.0;
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nudged = true;
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}
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else if (y == height)
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{
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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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{
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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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{
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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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{
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points[offset] = 0.0;
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nudged = true;
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}
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else if (x == width)
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{
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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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{
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points[offset + 1] = 0.0;
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nudged = true;
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}
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else if (y == height)
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{
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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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{
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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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{
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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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{
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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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{
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for (var x = 0; x < max; x += 2)
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{
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//var xpoint = (Math.floor( points[x]) * 4) + (Math.floor( points[x + 1]) * qrcode.width * 4);
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var bit = image[Math.floor( points[x])+ qrcode.width* Math.floor( points[x + 1])];
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//qrcode.imagedata.data[xpoint] = bit?255:0;
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//qrcode.imagedata.data[xpoint+1] = bit?255:0;
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//qrcode.imagedata.data[xpoint+2] = 0;
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//qrcode.imagedata.data[xpoint+3] = 255;
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//bits[x >> 1][ y]=bit;
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if(bit)
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bits.set_Renamed(x >> 1, y);
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}
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}
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catch ( aioobe)
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{
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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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GridSampler.sampleGridx=function( image, dimension, p1ToX, p1ToY, p2ToX, p2ToY, p3ToX, p3ToY, p4ToX, p4ToY, p1FromX, p1FromY, p2FromX, p2FromY, p3FromX, p3FromY, p4FromX, p4FromY)
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{
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var transform = PerspectiveTransform.quadrilateralToQuadrilateral(p1ToX, p1ToY, p2ToX, p2ToY, p3ToX, p3ToY, p4ToX, p4ToY, p1FromX, p1FromY, p2FromX, p2FromY, p3FromX, p3FromY, p4FromX, p4FromY);
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return GridSampler.sampleGrid3(image, dimension, transform);
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}
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