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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 class is used to help decode images from files which arrive as RGB data from * an ARGB pixel array. It does not support rotation. * * @author dswitkin@google.com (Daniel Switkin) * @author Betaminos */ final class RGBLuminanceSource extends LuminanceSource { public $luminances; private $dataWidth; private $dataHeight; private $left; private $top; private $pixels; public function __construct($pixels, $dataWidth, $dataHeight, $left=null, $top=null, $width=null, $height=null) { if(!$left&&!$top&&!$width&&!$height){ $this->RGBLuminanceSource_($pixels,$dataWidth,$dataHeight); return; } parent::__construct($width, $height); if ($left + $width > $dataWidth || $top + $height > $dataHeight) { throw new \InvalidArgumentException("Crop rectangle does not fit within image data."); } $this->luminances = $pixels; $this->dataWidth = $dataWidth; $this->dataHeight = $dataHeight; $this->left = $left; $this->top = $top; } public function RGBLuminanceSource_($width, $height, $pixels) { parent::__construct($width, $height); $this->dataWidth = $width; $this->dataHeight = $height; $this->left = 0; $this->top = 0; $this->pixels = $pixels; // In order to measure pure decoding speed, we convert the entire image to a greyscale array // up front, which is the same as the Y channel of the YUVLuminanceSource in the real app. $this->luminances = array(); //$this->luminances = $this->grayScaleToBitmap($this->grayscale()); foreach ($pixels as $key => $pixel) { $r = $pixel['red']; $g = $pixel['green']; $b = $pixel['blue']; /* if (($pixel & 0xFF000000) == 0) { $pixel = 0xFFFFFFFF; // = white } // .229R + 0.587G + 0.114B (YUV/YIQ for PAL and NTSC) $this->luminances[$key] = (306 * (($pixel >> 16) & 0xFF) + 601 * (($pixel >> 8) & 0xFF) + 117 * ($pixel & 0xFF) + 0x200) >> 10; */ //$r = ($pixel >> 16) & 0xff; //$g = ($pixel >> 8) & 0xff; //$b = $pixel & 0xff; if ($r == $g && $g == $b) { // Image is already greyscale, so pick any channel. $this->luminances[$key] = $r;//(($r + 128) % 256) - 128; } else { // Calculate luminance cheaply, favoring green. $this->luminances[$key] = ($r+2*$g+$b)/4;//(((($r + 2 * $g + $b) / 4) + 128) % 256) - 128; } } /* for ($y = 0; $y < $height; $y++) { $offset = $y * $width; for ($x = 0; $x < $width; $x++) { $pixel = $pixels[$offset + $x]; $r = ($pixel >> 16) & 0xff; $g = ($pixel >> 8) & 0xff; $b = $pixel & 0xff; if ($r == $g && $g == $b) { // Image is already greyscale, so pick any channel. $this->luminances[intval($offset + $x)] = (($r+128) % 256) - 128; } else { // Calculate luminance cheaply, favoring green. $this->luminances[intval($offset + $x)] = (((($r + 2 * $g + $b) / 4)+128)%256) - 128; } } */ //} // $this->luminances = $this->grayScaleToBitmap($this->luminances); } function grayscale(){ $width = $this->dataWidth; $height = $this->dataHeight; $ret = fill_array(0, $width*$height,0); for ($y = 0; $y < $height; $y++) { for ($x = 0; $x < $width; $x++) { $gray = $this->getPixel($x, $y,$width,$height); $ret[$x+$y*$width] = $gray; } } return $ret; } function getPixel($x,$y,$width,$height){ $image = $this->pixels; if ($width < $x) { die('error'); } if ($height < $y) { die('error'); } $point = ($x) + ($y * $width); $r = $image[$point]['red'];//($image[$point] >> 16) & 0xff; $g = $image[$point]['green'];//($image[$point] >> 8) & 0xff; $b = $image[$point]['blue'];//$image[$point] & 0xff; $p = intval(($r*33 +$g*34 + $b*33)/100); return $p; } function getMiddleBrightnessPerArea($image) { $numSqrtArea = 4; //obtain middle brightness((min + max) / 2) per area $areaWidth = floor($this->dataWidth / $numSqrtArea); $areaHeight = floor($this->dataHeight / $numSqrtArea); $minmax = fill_array(0,$numSqrtArea,0); for ($i = 0; $i < $numSqrtArea; $i++) { $minmax[$i] = fill_array(0,$numSqrtArea,0); for ($i2 = 0; $i2 < $numSqrtArea; $i2++) { $minmax[$i][$i2] = array(0,0); } } for ($ay = 0; $ay < $numSqrtArea; $ay++) { for ($ax = 0; $ax < $numSqrtArea; $ax++) { $minmax[$ax][$ay][0] = 0xFF; for ($dy = 0; $dy < $areaHeight; $dy++) { for ($dx = 0; $dx < $areaWidth; $dx++) { $target = $image[intval($areaWidth * $ax + $dx+($areaHeight * $ay + $dy)*$this->dataWidth)]; if ($target < $minmax[$ax][$ay][0]) $minmax[$ax][$ay][0] = $target; if ($target > $minmax[$ax][$ay][1]) $minmax[$ax][$ay][1] = $target; } } //minmax[ax][ay][0] = (minmax[ax][ay][0] + minmax[ax][ay][1]) / 2; } } $middle = array(); for ($i3 = 0; $i3 < $numSqrtArea; $i3++) { $middle[$i3] = array(); } for ($ay = 0; $ay < $numSqrtArea; $ay++) { for ($ax = 0; $ax < $numSqrtArea; $ax++) { $middle[$ax][$ay] = floor(($minmax[$ax][$ay][0] + $minmax[$ax][$ay][1]) / 2); //Console.out.print(middle[ax][ay] + ","); } //Console.out.println(""); } //Console.out.println(""); return $middle; } function grayScaleToBitmap ($grayScale) { $middle = $this->getMiddleBrightnessPerArea($grayScale); $sqrtNumArea = count($middle); $areaWidth = floor($this->dataWidth/ $sqrtNumArea); $areaHeight = floor($this->dataHeight / $sqrtNumArea); $bitmap = fill_array(0,$this->dataWidth*$this->dataHeight,0); for ($ay = 0; $ay < $sqrtNumArea; $ay++) { for ($ax = 0; $ax < $sqrtNumArea; $ax++) { for ($dy = 0; $dy < $areaHeight; $dy++) { for ($dx = 0; $dx < $areaWidth; $dx++) { $bitmap[intval($areaWidth * $ax + $dx+ ($areaHeight * $ay + $dy)*$this->dataWidth)] = ($grayScale[intval($areaWidth * $ax + $dx+ ($areaHeight * $ay + $dy)*$this->dataWidth)] < $middle[$ax][$ay])?0:255; } } } } return $bitmap; } //@Override public function getRow($y, $row=null) { if ($y < 0 || $y >= $this->getHeight()) { throw new \InvalidArgumentException("Requested row is outside the image: " + y); } $width = $this->getWidth(); if ($row == null || count($row) < $width) { $row = array(); } $offset = ($y + $this->top) * $this->dataWidth + $this->left; $row = arraycopy($this->luminances,$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->luminances; } $area = $width * $height; $matrix = array(); $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->luminances, $inputOffset, $matrix, 0, $area); return $matrix; } // Otherwise copy one cropped row at a time. $rgb = $this->luminances; for ($y = 0; $y < $height; $y++) { $outputOffset = $y * $width; $matrix = arraycopy($rgb, $inputOffset, $matrix, $outputOffset, $width); $inputOffset += $this->dataWidth; } return $matrix; } //@Override public function isCropSupported() { return true; } //@Override public function crop($left, $top, $width, $height) { return new RGBLuminanceSource($this->luminances, $this->dataWidth, $this->dataHeight, $this->left + $left, $this->top + $top, $width, $height); } }
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