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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;
/**
* @var mixed|int
*/
private $left;
/**
* @var mixed|int
*/
private $top;
/**
* @var mixed|null
*/
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, $height): void
{
parent::__construct($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.
$this->luminances = [];
//$this->luminances = $this->grayScaleToBitmap($this->grayscale());
$array = [];
$rgb = [];
for ($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.
$this->luminances[(int)($offset + $x)] = (($r+128) % 256) - 128;
} else {
// Calculate luminance cheaply, favoring green.
$this->luminances[(int)($offset + $x)] = (((($r + 2 * $g + $b) / 4)+128)%256) - 128;
}
}
*/
//}
// $this->luminances = $this->grayScaleToBitmap($this->luminances);
}
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 || (is_countable($row) ? count($row) : 0) < $width) {
$row = [];
}
$offset = ($y + $this->top) * $this->dataWidth + $this->left;
$row = arraycopy($this->luminances, $offset, $row, 0, $width);
return $row;
}
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 = [];
$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 $matrix;
}
public function isCropSupported(): bool
{
return true;
}
public function crop($left, $top, $width, $height): \Zxing\GDLuminanceSource
{
return new GDLuminanceSource(
$this->luminances,
$this->dataWidth,
$this->dataHeight,
$this->left + $left,
$this->top + $top,
$width,
$height
);
}
public function rotateCounterClockwise(): void
{
throw new \RuntimeException("This LuminanceSource does not support rotateCounterClockwise");
}
public function rotateCounterClockwise45(): void
{
throw new \RuntimeException("This LuminanceSource does not support rotateCounterClockwise45");
}
}
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