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<?php
/*
* 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.
*/
namespace Zxing\Common;
use Zxing\NotFoundException;
/**
* @author Sean Owen
*/
final class DefaultGridSampler extends GridSampler
{
/**
* @return BitMatrix
*/
public function sampleGrid(
$image,
$dimensionX,
$dimensionY,
$p1ToX,
$p1ToY,
$p2ToX,
$p2ToY,
$p3ToX,
$p3ToY,
$p4ToX,
$p4ToY,
$p1FromX,
$p1FromY,
$p2FromX,
$p2FromY,
$p3FromX,
$p3FromY,
$p4FromX,
$p4FromY
) {
$transform = PerspectiveTransform::quadrilateralToQuadrilateral(
$p1ToX,
$p1ToY,
$p2ToX,
$p2ToY,
$p3ToX,
$p3ToY,
$p4ToX,
$p4ToY,
$p1FromX,
$p1FromY,
$p2FromX,
$p2FromY,
$p3FromX,
$p3FromY,
$p4FromX,
$p4FromY
);
return $this->sampleGrid_($image, $dimensionX, $dimensionY, $transform);
}
/**
* @return BitMatrix
*/
public function sampleGrid_(
BitMatrix $image,
int $dimensionX,
int $dimensionY,
PerspectiveTransform $transform
): BitMatrix {
if ($dimensionX <= 0 || $dimensionY <= 0) {
throw new NotFoundException("X or Y dimensions smaller than zero");
}
$bits = new BitMatrix($dimensionX, $dimensionY);
$points = fill_array(0, 2 * $dimensionX, 0.0);
for ($y = 0; $y < $dimensionY; $y++) {
$max = is_countable($points) ? count($points) : 0;
$iValue = (float)$y + 0.5;
for ($x = 0; $x < $max; $x += 2) {
$points[$x] = (float)($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
self::checkAndNudgePoints($image, $points);
try {
for ($x = 0; $x < $max; $x += 2) {
if ($image->get((int)$points[$x], (int)$points[$x + 1])) {
// Black(-ish) pixel
$bits->set($x / 2, $y);
}
}
} catch (\Exception) { //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("ArrayIndexOutOfBoundsException");
}
}
return $bits;
}
}
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