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<?php
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namespace Del\Image\Strategy;
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class GifStrategy implements ImageTypeStrategyInterface
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{
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/**
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* @param string $filename
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* @return resource
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*/
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public function create(string $filename)
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{
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return \imagecreatefromgif($filename);
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}
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/**
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* @param resource $resource
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* @param string $filename
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* @param int $compression
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* @return void
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*/
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public function save($resource, string $filename = null, int $compression = 100): void
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{
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unset($compression);
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\imagegif($resource, $filename);
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}
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/**
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* @return string
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*/
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public function getContentType(): string
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{
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return 'image/gif';
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}
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/**
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* @param resource $resource
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*/
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public function render($resource): void
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{
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\imagegif($resource);
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}
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public function handleTransparency($newImage, $image): void
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{
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// Get transparency color's index number
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$transparency = $this->getTransparencyIndex($image);
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// Is a strange index other than -1 set?
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if ($transparency >= 0) {
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$this->prepWithCustomTransparencyIndex($newImage, $image, $transparency);
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}
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}
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/**
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* @param resource $newImage
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* @param resource $image
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* @param int $index
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*/
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private function prepWithCustomTransparencyIndex($newImage, $image, int $index): void
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{
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// Get the array of RGB vals for the transparency index
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$transparentColor = \imagecolorsforindex($image, $index);
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// Now allocate the color
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$transparency = \imagecolorallocate($newImage, $transparentColor['red'], $transparentColor['green'], $transparentColor['blue']);
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// Fill the background with the color
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\imagefill($newImage, 0, 0, $transparency);
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// And set that color as the transparent one
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\imagecolortransparent($newImage, $transparency);
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}
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/**
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* @param resource $image
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* @return int
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*/
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private function getTransparencyIndex($image): int
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{
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return \imagecolortransparent($image);
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}
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/**
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* @return string
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*/
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public function getFileExtension(): string
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{
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return 'gif';
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}
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}
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delboy1978uk /
image
If the returned type also contains false, it is an indicator that maybe an error condition leading to the specific return statement remains unhandled.