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<?php namespace Zxing; /** * This class is used to help decode images from files which arrive as GD Resource * It does not support rotation. * * * */ final class GDLuminanceSource extends LuminanceSource { public $luminances; private $dataWidth; private $dataHeight; private $left; private $top; private $gdImage; public function __construct($gdImage, $dataWidth, $dataHeight, $left=null, $top=null, $width=null, $height=null) { if(!$left&&!$top&&!$width&&!$height){ $this->GDLuminanceSource($gdImage,$dataWidth,$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 = $gdImage; $this->dataWidth = $dataWidth; $this->dataHeight = $dataHeight; $this->left = $left; $this->top = $top; } public function GDLuminanceSource($gdImage, $width, $height) { parent::__construct($width, $height); $this->dataWidth = $width; $this->dataHeight = $height; $this->left = 0; $this->top = 0; $this->$gdImage = $gdImage; // 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()); $array = array(); $rgb = array(); for($j=0;$j<$height;$j++){ for($i=0;$i<$width;$i++){ $argb = imagecolorat($this->$gdImage, $i, $j); $pixel = imagecolorsforindex($this->$gdImage, $argb); $r = $pixel['red']; $g = $pixel['green']; $b = $pixel['blue']; if ($r == $g && $g == $b) { // Image is already greyscale, so pick any channel. $this->luminances[] = $r;//(($r + 128) % 256) - 128; } else { // Calculate luminance cheaply, favoring green. $this->luminances[] = ($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); } //@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, $height) { return new GDLuminanceSource($this->luminances, $this->dataWidth, $this->dataHeight, $this->left + $left, $this->top + $top, $width, $height); } }
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