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<?php |
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namespace Sunnysideup\AssetsOverview\Api; |
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class CompareImages |
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{ |
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public function compare($a, $b) |
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{ |
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// main function. returns the hammering distance of two images' bit value |
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$i1 = $this->createImage($a); |
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$i2 = $this->createImage($b); |
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if (! $i1 || ! $i2) { |
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return false; |
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} |
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$i1 = $this->resizeImage($i1, $a); |
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$i2 = $this->resizeImage($i2, $b); |
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imagefilter($i1, IMG_FILTER_GRAYSCALE); |
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imagefilter($i2, IMG_FILTER_GRAYSCALE); |
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$colorMean1 = $this->colorMeanValue($i1); |
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$colorMean2 = $this->colorMeanValue($i2); |
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$bits1 = $this->bits($colorMean1); |
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$bits2 = $this->bits($colorMean2); |
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$hammeringDistance = 0; |
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for ($a = 0; $a < 64; ++$a) { |
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if ($bits1[$a] !== $bits2[$a]) { |
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++$hammeringDistance; |
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} |
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} |
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return $hammeringDistance; |
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} |
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private function mimeType($i) |
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{ |
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// returns array with mime type and if its jpg or png. Returns false if it isn't jpg or png |
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$mime = getimagesize($i); |
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$return = [$mime[0], $mime[1]]; |
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switch ($mime['mime']) { |
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case 'image/jpeg': |
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$return[] = 'jpg'; |
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return $return; |
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case 'image/png': |
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$return[] = 'png'; |
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return $return; |
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default: |
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return false; |
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} |
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} |
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private function createImage($i) |
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{ |
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// retuns image resource or false if its not jpg or png |
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$mime = $this->mimeType($i); |
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if ('jpg' === $mime[2]) { |
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return imagecreatefromjpeg($i); |
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} |
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if ('png' === $mime[2]) { |
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return imagecreatefrompng($i); |
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} |
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return false; |
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} |
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private function resizeImage($i, $source) |
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{ |
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// resizes the image to a 8x8 squere and returns as image resource |
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$mime = $this->mimeType($source); |
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$t = imagecreatetruecolor(8, 8); |
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$source = $this->createImage($source); |
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imagecopyresized($t, $source, 0, 0, 0, 0, 8, 8, $mime[0], $mime[1]); |
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return $t; |
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} |
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private function colorMeanValue($i) |
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{ |
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// returns the mean value of the colors and the list of all pixel's colors |
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$colorList = []; |
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$colorSum = 0; |
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for ($a = 0; $a < 8; ++$a) { |
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for ($b = 0; $b < 8; ++$b) { |
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$rgb = imagecolorat($i, $a, $b); |
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$colorList[] = $rgb & 0xFF; |
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$colorSum += $rgb & 0xFF; |
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} |
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} |
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return [$colorSum / 64, $colorList]; |
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} |
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private function bits($colorMean) |
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{ |
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// returns an array with 1 and zeros. If a color is bigger than the mean value of colors it is 1 |
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$bits = []; |
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foreach ($colorMean[1] as $color) { |
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$bits[] = $color >= $colorMean[0] ? 1 : 0; |
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} |
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return $bits; |
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} |
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} |
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sunnysideup /
silverstripe-assets_overview
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