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<?php /* * 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. */ namespace Zxing; /** * 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) */ final class PlanarYUVLuminanceSource extends LuminanceSource { private static $THUMBNAIL_SCALE_FACTOR = 2; private $yuvData; private $dataWidth; private $dataHeight; private $left; private $top; public function __construct($yuvData, $dataWidth, $dataHeight, $left, $top, $width, $height, $reverseHorizontal) { parent::__construct($width, $height); if ($left + $width > $dataWidth || $top + $height > $dataHeight) { throw new IllegalArgumentException("Crop rectangle does not fit within image data."); } $this->yuvData = $yuvData; $this->dataWidth = $dataWidth; $this->dataHeight = $dataHeight; $this->left = $left; $this->top = $top; if ($reverseHorizontal) { $this->reverseHorizontal($width, $height); } } //@Override public function getRow($y, $row=null) { if ($y < 0 || $y >= getHeight()) { throw new IllegalArgumentException("Requested row is outside the image: " + y); } $width = $this->getWidth(); if ($row == null || count($row) < $width) { $row = array();//new byte[width]; } $offset = ($y + $this->top) * $this->dataWidth + $this->left; $row = arraycopy($this->yuvData, $offset, $row, 0, $width); return $row; } //@Override public function getMatrix() { $width = $this->getWidth(); $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; } $area = $width * $height; $matrix = array();//new byte[area]; $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) { $matrix = arraycopy($this->yuvData, $inputOffset, $matrix, 0, $area); return $matrix; } // Otherwise copy one cropped row at a time. $yuv = $this->yuvData; for ($y = 0; $y < $height; $y++) { $outputOffset = $y * $width; $matrix = arraycopy($this->yuvData, $inputOffset, $matrix, $outputOffset, $width); $inputOffset += $this->dataWidth; } return $matrix; } // @Override public function isCropSupported() { return true; } // @Override public function crop($left, $top, $width, $height) { return new PlanarYUVLuminanceSource($this->yuvData, $this->dataWidth, $this->dataHeight, $this->left + $left, $this->top + $top, $width, $height, false); } public function renderThumbnail() { $width = intval($this->getWidth() / self::$THUMBNAIL_SCALE_FACTOR); $height = intval($this->getHeight() / self::$THUMBNAIL_SCALE_FACTOR); $pixels = array();//new int[width * height]; $yuv = $this->yuvData; $inputOffset = $this->top * $this->dataWidth + $this->left; for ($y = 0; $y < $height; $y++) { $outputOffset = $y * $width; for ($x = 0; $x < $width; $x++) { $grey = intval32bits($yuv[$inputOffset + $x * self::$THUMBNAIL_SCALE_FACTOR] & 0xff); $pixels[$outputOffset + $x] = intval32bits(0xFF000000 | ($grey * 0x00010101)); } $inputOffset += $this->dataWidth * self::$THUMBNAIL_SCALE_FACTOR; } return $pixels; } /** * @return width of image from {@link #renderThumbnail()} */ /* public int getThumbnailWidth() { return getWidth() / THUMBNAIL_SCALE_FACTOR; }*/ /** * @return height of image from {@link #renderThumbnail()} */ /* public int getThumbnailHeight() { return getHeight() / THUMBNAIL_SCALE_FACTOR; } private void reverseHorizontal(int width, int height) { byte[] yuvData = this.yuvData; for (int y = 0, rowStart = top * dataWidth + left; y < height; y++, rowStart += dataWidth) { int middle = rowStart + width / 2; for (int x1 = rowStart, x2 = rowStart + width - 1; x1 < middle; x1++, x2--) { byte temp = yuvData[x1]; yuvData[x1] = yuvData[x2]; yuvData[x2] = temp; } } } */ }
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