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vendor/khanamiryan/qrcode-detector-decoder/lib/GDLuminanceSource.php

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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);
+    }
+
+}