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<?php |
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declare(strict_types=1); |
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/* |
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* This file is part of Cecil. |
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* |
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* Copyright (c) Arnaud Ligny <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Cecil\Assets; |
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use Cecil\Exception\RuntimeException; |
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use Intervention\Image\ImageManagerStatic as ImageManager; |
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class Image |
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{ |
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/** |
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* Build the `srcset` attribute for responsive images. |
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* e.g.: `srcset="/img-480.jpg 480w, /img-800.jpg 800w"`. |
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* |
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* @throws RuntimeException |
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*/ |
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public static function buildSrcset(Asset $asset, array $widths): string |
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{ |
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if ($asset['type'] !== 'image') { |
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throw new RuntimeException(sprintf('can\'t build "srcset" of "%s": it\'s not an image file.', $asset['path'])); |
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} |
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$srcset = ''; |
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foreach ($widths as $width) { |
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if ($asset['width'] < $width) { |
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break; |
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} |
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$img = $asset->resize($width); |
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$srcset .= sprintf('%s %sw, ', (string) $img, $width); |
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} |
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rtrim($srcset, ', '); |
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// adds source image? |
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if (!empty($srcset) && ($asset['width'] < max($widths))) { |
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$srcset .= sprintf('%s %sw', (string) $asset, $asset['width']); |
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} |
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return $srcset; |
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} |
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/** |
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* Returns the value of the "sizes" attribute corresponding to the configured class. |
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*/ |
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public static function getSizes(string $class, array $sizes = []): string |
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{ |
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$result = ''; |
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$classArray = explode(' ', $class); |
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foreach ($classArray as $class) { |
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if (\array_key_exists($class, $sizes)) { |
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$result = $sizes[$class] . ', '; |
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} |
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} |
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if (!empty($result)) { |
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return trim($result, ', '); |
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} |
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return $sizes['default'] ?? '100vw'; |
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} |
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/** |
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* Checks if an asset is an animated GIF. |
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*/ |
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public static function isAnimatedGif(Asset $asset): bool |
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{ |
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// an animated GIF contains multiple "frames", with each frame having a header made up of: |
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// 1. a static 4-byte sequence (\x00\x21\xF9\x04) |
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// 2. 4 variable bytes |
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// 3. a static 2-byte sequence (\x00\x2C) |
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$count = preg_match_all('#\x00\x21\xF9\x04.{4}\x00[\x2C\x21]#s', (string) $asset['content_source']); |
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return $count > 1; |
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} |
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/** |
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* Returns the dominant hexadecimal color of an image asset. |
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* |
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* @throws RuntimeException |
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*/ |
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public static function getDominantColor(Asset $asset): string |
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{ |
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if ($asset['type'] !== 'image') { |
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throw new RuntimeException(sprintf('can\'t get dominant color of "%s": it\'s not an image file.', $asset['path'])); |
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} |
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$assetColor = clone $asset; |
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$assetColor = $assetColor->resize(100); |
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$img = ImageManager::make($assetColor['content']); |
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$color = $img->limitColors(1)->pickColor(0, 0, 'hex'); |
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$img->destroy(); |
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return $color; |
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} |
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/** |
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* Returns a Low Quality Image Placeholder (LQIP) as data URL. |
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* |
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* @throws RuntimeException |
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*/ |
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public static function getLqip(Asset $asset): string |
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{ |
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if ($asset['type'] !== 'image') { |
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throw new RuntimeException(sprintf('can\'t create LQIP of "%s": it\'s not an image file.', $asset['path'])); |
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} |
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$assetLqip = clone $asset; |
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$assetLqip = $assetLqip->resize(100); |
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return (string) ImageManager::make($assetLqip['content'])->blur(50)->encode('data-url'); |
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} |
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} |
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Cecilapp /
Cecil
