310 lines
9.8 KiB
PHP
310 lines
9.8 KiB
PHP
<?php
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/*
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* Copyright 2009 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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namespace Zxing;
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/**
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* This class is used to help decode images from files which arrive as RGB data from
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* an ARGB pixel array. It does not support rotation.
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*
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* @author dswitkin@google.com (Daniel Switkin)
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* @author Betaminos
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*/
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final class RGBLuminanceSource extends LuminanceSource
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{
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public $luminances;
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private $dataWidth;
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private $dataHeight;
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private $left;
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private $top;
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private $pixels;
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public function __construct(
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$pixels,
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$dataWidth,
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$dataHeight,
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$left = null,
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$top = null,
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$width = null,
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$height = null
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) {
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if (!$left && !$top && !$width && !$height) {
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$this->RGBLuminanceSource_($pixels, $dataWidth, $dataHeight);
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return;
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}
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parent::__construct($width, $height);
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if ($left + $width > $dataWidth || $top + $height > $dataHeight) {
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throw new \InvalidArgumentException("Crop rectangle does not fit within image data.");
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}
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$this->luminances = $pixels;
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$this->dataWidth = $dataWidth;
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$this->dataHeight = $dataHeight;
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$this->left = $left;
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$this->top = $top;
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}
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public function RGBLuminanceSource_($width, $height, $pixels)
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{
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parent::__construct($width, $height);
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$this->dataWidth = $width;
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$this->dataHeight = $height;
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$this->left = 0;
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$this->top = 0;
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$this->pixels = $pixels;
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// In order to measure pure decoding speed, we convert the entire image to a greyscale array
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// up front, which is the same as the Y channel of the YUVLuminanceSource in the real app.
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$this->luminances = [];
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//$this->luminances = $this->grayScaleToBitmap($this->grayscale());
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foreach ($pixels as $key => $pixel) {
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$r = $pixel['red'];
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$g = $pixel['green'];
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$b = $pixel['blue'];
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/* if (($pixel & 0xFF000000) == 0) {
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$pixel = 0xFFFFFFFF; // = white
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}
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// .229R + 0.587G + 0.114B (YUV/YIQ for PAL and NTSC)
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$this->luminances[$key] =
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(306 * (($pixel >> 16) & 0xFF) +
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601 * (($pixel >> 8) & 0xFF) +
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117 * ($pixel & 0xFF) +
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0x200) >> 10;
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*/
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//$r = ($pixel >> 16) & 0xff;
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//$g = ($pixel >> 8) & 0xff;
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//$b = $pixel & 0xff;
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if ($r == $g && $g == $b) {
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// Image is already greyscale, so pick any channel.
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$this->luminances[$key] = $r;//(($r + 128) % 256) - 128;
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} else {
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// Calculate luminance cheaply, favoring green.
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$this->luminances[$key] = ($r + 2 * $g + $b) / 4;//(((($r + 2 * $g + $b) / 4) + 128) % 256) - 128;
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}
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}
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/*
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for ($y = 0; $y < $height; $y++) {
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$offset = $y * $width;
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for ($x = 0; $x < $width; $x++) {
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$pixel = $pixels[$offset + $x];
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$r = ($pixel >> 16) & 0xff;
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$g = ($pixel >> 8) & 0xff;
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$b = $pixel & 0xff;
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if ($r == $g && $g == $b) {
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// Image is already greyscale, so pick any channel.
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$this->luminances[(int)($offset + $x)] = (($r+128) % 256) - 128;
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} else {
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// Calculate luminance cheaply, favoring green.
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$this->luminances[(int)($offset + $x)] = (((($r + 2 * $g + $b) / 4)+128)%256) - 128;
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}
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}
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*/
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//}
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// $this->luminances = $this->grayScaleToBitmap($this->luminances);
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}
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public function grayscale()
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{
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$width = $this->dataWidth;
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$height = $this->dataHeight;
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$ret = fill_array(0, $width * $height, 0);
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for ($y = 0; $y < $height; $y++) {
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for ($x = 0; $x < $width; $x++) {
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$gray = $this->getPixel($x, $y, $width, $height);
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$ret[$x + $y * $width] = $gray;
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}
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}
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return $ret;
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}
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public function getPixel($x, $y, $width, $height)
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{
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$image = $this->pixels;
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if ($width < $x) {
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die('error');
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}
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if ($height < $y) {
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die('error');
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}
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$point = ($x) + ($y * $width);
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$r = $image[$point]['red'];//($image[$point] >> 16) & 0xff;
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$g = $image[$point]['green'];//($image[$point] >> 8) & 0xff;
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$b = $image[$point]['blue'];//$image[$point] & 0xff;
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$p = (int)(($r * 33 + $g * 34 + $b * 33) / 100);
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return $p;
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}
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public function grayScaleToBitmap($grayScale)
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{
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$middle = $this->getMiddleBrightnessPerArea($grayScale);
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$sqrtNumArea = count($middle);
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$areaWidth = floor($this->dataWidth / $sqrtNumArea);
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$areaHeight = floor($this->dataHeight / $sqrtNumArea);
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$bitmap = fill_array(0, $this->dataWidth * $this->dataHeight, 0);
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for ($ay = 0; $ay < $sqrtNumArea; $ay++) {
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for ($ax = 0; $ax < $sqrtNumArea; $ax++) {
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for ($dy = 0; $dy < $areaHeight; $dy++) {
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for ($dx = 0; $dx < $areaWidth; $dx++) {
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$bitmap[(int)($areaWidth * $ax + $dx + ($areaHeight * $ay + $dy) * $this->dataWidth)] = ($grayScale[(int)($areaWidth * $ax + $dx + ($areaHeight * $ay + $dy) * $this->dataWidth)] < $middle[$ax][$ay]) ? 0 : 255;
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}
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}
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}
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}
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return $bitmap;
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}
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public function getMiddleBrightnessPerArea($image)
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{
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$numSqrtArea = 4;
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//obtain middle brightness((min + max) / 2) per area
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$areaWidth = floor($this->dataWidth / $numSqrtArea);
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$areaHeight = floor($this->dataHeight / $numSqrtArea);
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$minmax = fill_array(0, $numSqrtArea, 0);
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for ($i = 0; $i < $numSqrtArea; $i++) {
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$minmax[$i] = fill_array(0, $numSqrtArea, 0);
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for ($i2 = 0; $i2 < $numSqrtArea; $i2++) {
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$minmax[$i][$i2] = [0, 0];
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}
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}
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for ($ay = 0; $ay < $numSqrtArea; $ay++) {
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for ($ax = 0; $ax < $numSqrtArea; $ax++) {
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$minmax[$ax][$ay][0] = 0xFF;
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for ($dy = 0; $dy < $areaHeight; $dy++) {
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for ($dx = 0; $dx < $areaWidth; $dx++) {
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$target = $image[(int)($areaWidth * $ax + $dx + ($areaHeight * $ay + $dy) * $this->dataWidth)];
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if ($target < $minmax[$ax][$ay][0])
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$minmax[$ax][$ay][0] = $target;
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if ($target > $minmax[$ax][$ay][1])
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$minmax[$ax][$ay][1] = $target;
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}
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}
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//minmax[ax][ay][0] = (minmax[ax][ay][0] + minmax[ax][ay][1]) / 2;
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}
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}
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$middle = [];
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for ($i3 = 0; $i3 < $numSqrtArea; $i3++) {
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$middle[$i3] = [];
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}
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for ($ay = 0; $ay < $numSqrtArea; $ay++) {
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for ($ax = 0; $ax < $numSqrtArea; $ax++) {
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$middle[$ax][$ay] = floor(($minmax[$ax][$ay][0] + $minmax[$ax][$ay][1]) / 2);
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//Console.out.print(middle[ax][ay] + ",");
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}
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//Console.out.println("");
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}
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//Console.out.println("");
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return $middle;
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}
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//@Override
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public function getRow($y, $row = null)
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{
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if ($y < 0 || $y >= $this->getHeight()) {
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throw new \InvalidArgumentException("Requested row is outside the image: " + y);
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}
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$width = $this->getWidth();
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if ($row == null || count($row) < $width) {
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$row = [];
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}
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$offset = ($y + $this->top) * $this->dataWidth + $this->left;
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$row = arraycopy($this->luminances, $offset, $row, 0, $width);
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return $row;
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}
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//@Override
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public function getMatrix()
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{
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$width = $this->getWidth();
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$height = $this->getHeight();
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// If the caller asks for the entire underlying image, save the copy and give them the
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// original data. The docs specifically warn that result.length must be ignored.
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if ($width == $this->dataWidth && $height == $this->dataHeight) {
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return $this->luminances;
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}
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$area = $width * $height;
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$matrix = [];
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$inputOffset = $this->top * $this->dataWidth + $this->left;
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// If the width matches the full width of the underlying data, perform a single copy.
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if ($width == $this->dataWidth) {
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$matrix = arraycopy($this->luminances, $inputOffset, $matrix, 0, $area);
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return $matrix;
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}
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// Otherwise copy one cropped row at a time.
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$rgb = $this->luminances;
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for ($y = 0; $y < $height; $y++) {
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$outputOffset = $y * $width;
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$matrix = arraycopy($rgb, $inputOffset, $matrix, $outputOffset, $width);
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$inputOffset += $this->dataWidth;
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}
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return $matrix;
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}
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//@Override
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public function isCropSupported()
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{
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return true;
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}
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//@Override
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public function crop($left, $top, $width, $height)
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{
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return new RGBLuminanceSource($this->luminances,
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$this->dataWidth,
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$this->dataHeight,
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$this->left + $left,
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$this->top + $top,
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$width,
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$height);
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}
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}
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