159 lines
4.0 KiB
PHP
159 lines
4.0 KiB
PHP
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<?php
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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 GD Resource
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* It does not support rotation.
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*/
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final class IMagickLuminanceSource 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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/**
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* @var mixed|int
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*/
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private $left;
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/**
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* @var mixed|int
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*/
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private $top;
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private ?\Imagick $image = null;
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public function __construct(
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\Imagick $image,
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$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->_IMagickLuminanceSource($image, $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 = $image;
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$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 _IMagickLuminanceSource(\Imagick $image, $width, $height): void
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{
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parent::__construct($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->image = $image;
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// In order to measure pure decoding speed, we convert the entire image to a greyscale array
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// up front, which is the same as the Y channel of the YUVLuminanceSource in the real app.
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$this->luminances = [];
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$image->setImageColorspace(\Imagick::COLORSPACE_GRAY);
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// $image->newPseudoImage(0, 0, "magick:rose");
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$pixels = $image->exportImagePixels(1, 1, $width, $height, "RGB", \Imagick::PIXEL_CHAR);
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$array = [];
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$rgb = [];
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$countPixels = count($pixels);
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for ($i = 0; $i < $countPixels; $i += 3) {
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$r = $pixels[$i] & 0xff;
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$g = $pixels[$i + 1] & 0xff;
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$b = $pixels[$i + 2] & 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[] = $r;//(($r + 128) % 256) - 128;
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} else {
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// Calculate luminance cheaply, favoring green.
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$this->luminances[] = ($r + 2 * $g + $b) / 4;//(((($r + 2 * $g + $b) / 4) + 128) % 256) - 128;
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}
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}
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}
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//@Override
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public function getRow($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 || (is_countable($row) ? count($row) : 0) < $width) {
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$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 $matrix;
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}
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//@Override
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public function isCropSupported(): bool
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{
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return true;
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}
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//@Override
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public function crop($left, $top, $width, $height)
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{
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return $this->luminances->cropImage($width, $height, $left, $top);
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return new GDLuminanceSource(
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$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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}
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