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<?php |
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declare(strict_types=1); |
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namespace Minepic\Image; |
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use Minepic\Image\Components\Side; |
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use Minepic\Image\Exceptions\ImageTrueColorCreationFailedException; |
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class LayerValidator |
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{ |
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/** |
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* Max Standard Deviation value for layer check. |
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*/ |
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private const DEFAULT_STANDARD_DEVIATION = 0.2; |
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private int $meanAlpha; |
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private float $redStdDev; |
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private float $greenStdDev; |
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private float $blueStdDev; |
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/** |
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* Checks if base image has helm for section. |
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* |
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* @throws ImageTrueColorCreationFailedException |
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*/ |
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public function check(\GdImage $sourceImage, Side $side): bool |
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{ |
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$checkImage = $this->createCheckImage($sourceImage, $side); |
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$this->calculate($checkImage, $side); |
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return $this->validStdDev() || $this->meanAlpha === 127; |
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} |
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/** |
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* Calculate sttdev for merging helm. |
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*/ |
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protected function calculate(\GdImage $checkImage, Side $side): void |
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{ |
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// Check for helm image |
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$allRed = []; |
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$allGreen = []; |
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$allBlue = []; |
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$allAlpha = []; |
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$x = 0; |
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while ($x < $side->getWidth()) { |
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$y = 0; |
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while ($y < $side->getHeight()) { |
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$color = (int) imagecolorat($checkImage, $x, $y); |
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$colors = imagecolorsforindex($checkImage, $color); |
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$allRed[] = $colors['red']; |
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$allGreen[] = $colors['green']; |
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$allBlue[] = $colors['blue']; |
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$allAlpha[] = $colors['alpha']; |
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++$y; |
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} |
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++$x; |
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} |
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// mean value for each color |
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$totalPixels = $side->getWidth() * $side->getHeight(); |
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$meanRed = array_sum($allRed) / $totalPixels; |
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$meanGreen = array_sum($allGreen) / $totalPixels; |
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$meanBlue = array_sum($allBlue) / $totalPixels; |
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$this->meanAlpha = (int) round(array_sum($allAlpha) / $totalPixels); |
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// Arrays deviation |
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$devsRed = []; |
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$devsGreen = []; |
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$devsBlue = []; |
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$i = 0; |
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while ($i < $totalPixels) { |
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$devsRed[] = ($allRed[$i] - $meanRed) ** 2; |
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$devsGreen[] = ($allGreen[$i] - $meanGreen) ** 2; |
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$devsBlue[] = ($allBlue[$i] - $meanBlue) ** 2; |
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++$i; |
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} |
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// stddev for each color |
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$this->redStdDev = sqrt(array_sum($devsRed) / $totalPixels); |
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$this->greenStdDev = sqrt(array_sum($devsGreen) / $totalPixels); |
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$this->blueStdDev = sqrt(array_sum($devsBlue) / $totalPixels); |
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} |
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/** |
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* @throws ImageTrueColorCreationFailedException |
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*/ |
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private function createCheckImage(\GdImage $sourceImage, Side $side): \GdImage |
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{ |
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$width = $side->getWidth(); |
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$height = $side->getHeight(); |
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$checkImage = imagecreatetruecolor($side->getWidth(), $side->getHeight()); |
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if ($checkImage === false) { |
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throw new ImageTrueColorCreationFailedException('imagecreatetruecolor failed'); |
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} |
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imagealphablending($checkImage, false); |
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imagesavealpha($checkImage, true); |
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$colorIdentifier = (int) imagecolorallocatealpha($checkImage, 255, 255, 255, 127); |
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imagefilledrectangle($checkImage, 0, 0, $width, $height, $colorIdentifier); |
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imagecopy($checkImage, $sourceImage, 0, 0, $side->getTopLeft()->getX(), $side->getTopLeft()->getY(), $width, $height); |
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return $checkImage; |
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} |
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private function validStdDev(): bool |
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{ |
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return ($this->redStdDev > self::DEFAULT_STANDARD_DEVIATION && $this->greenStdDev > self::DEFAULT_STANDARD_DEVIATION) || |
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($this->redStdDev > self::DEFAULT_STANDARD_DEVIATION && $this->blueStdDev > self::DEFAULT_STANDARD_DEVIATION) || |
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($this->greenStdDev > self::DEFAULT_STANDARD_DEVIATION && $this->blueStdDev > self::DEFAULT_STANDARD_DEVIATION); |
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} |
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} |
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mattiabasone /
minepic
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