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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);
}
}