Image::buildHtmlSrcset() - Code Metrics - Cecilapp/Cecil - Measure and Improve Code Quality continuously with Scrutinizer

Image::buildHtmlSrcset() B
last analyzed 2025-10-30 11:08 UTC

↳ Parent: Image

Complexity

Conditions	8
Paths	7

Size

Total Lines	24
Code Lines	15

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	8
eloc	15
c	0
b	0
f	0
nc	7
nop	3
dl	0
loc	24
rs	8.4444

<?php

/**
 * This file is part of Cecil.
 *
 * (c) Arnaud Ligny <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

declare(strict_types=1);

namespace Cecil\Asset;

use Cecil\Asset;
use Cecil\Exception\RuntimeException;
use Intervention\Image\Drivers\Gd\Driver as GdDriver;
use Intervention\Image\Drivers\Imagick\Driver as ImagickDriver;
use Intervention\Image\Encoders\AutoEncoder;
use Intervention\Image\ImageManager;

/**
 * Image Asset class.
 *
 * Provides methods to manipulate images, such as resizing, cropping, converting,
 * and generating data URLs.
 *
 * This class uses the Intervention Image library to handle image processing.
 * It supports both GD and Imagick drivers, depending on the available PHP extensions.
 */
class Image
{
    /**
     * Create new manager instance with available driver.
     */
    private static function manager(): ImageManager
    {
        $driver = null;

        // ImageMagick is available? (for a future quality option)
        if (\extension_loaded('imagick') && class_exists('Imagick')) {
            $driver = ImagickDriver::class;
        }
        // Use GD, because it's the faster driver
        if (\extension_loaded('gd') && \function_exists('gd_info')) {
            $driver = GdDriver::class;
        }

        if ($driver) {
            return ImageManager::withDriver(
                $driver,
                [
                    'autoOrientation' => true,
                    'decodeAnimation' => true,
                    'blendingColor' => 'ffffff',
                    'strip' => true, // remove metadata
                ]
            );
        }

        throw new RuntimeException('PHP GD (or Imagick) extension is required.');
    }

    /**
     * Scales down an image Asset to the given width, keeping the aspect ratio.
     *
     * @throws RuntimeException
     */
    public static function resize(Asset $asset, int $width, int $quality): string
    {
        try {
            // creates image object from source
            $image = self::manager()->read($asset['content']);
            // resizes to $width with constraint the aspect-ratio and unwanted upsizing
            $image->scaleDown(width: $width);
            // return image data
            return (string) $image->encodeByMediaType(
                $asset['subtype'],
                /** @scrutinizer ignore-type */
                progressive: true,
                /** @scrutinizer ignore-type */
                interlaced: false,
                quality: $quality
            );
        } catch (\Exception $e) {
            throw new RuntimeException(\sprintf('Asset "%s" can\'t be resized: %s', $asset['path'], $e->getMessage()));
        }
    }

    /**
     * Crops an image Asset to the given width and height, keeping the aspect ratio.
     *
     * @throws RuntimeException
     */
    public static function cover(Asset $asset, int $width, int $height, int $quality): string
    {
        try {
            // creates image object from source
            $image = self::manager()->read($asset['content']);
            // turns an animated image (i.e GIF) into a static image
            if ($image->isAnimated()) {
                $image = $image->removeAnimation('25%'); // use 25% to avoid an "empty" frame
            }
            // crops the image
            $image->cover(
                width: $width,
                height: $height,
                position: 'center'
            );
            // return image data
            return (string) $image->encodeByMediaType(
                $asset['subtype'],
                /** @scrutinizer ignore-type */
                progressive: true,
                /** @scrutinizer ignore-type */
                interlaced: false,
                quality: $quality
            );
        } catch (\Exception $e) {
            throw new RuntimeException(\sprintf('Asset "%s" can\'t be cropped: %s', $asset['path'], $e->getMessage()));
        }
    }

    /**
     * Makes an image Asset maskable, meaning it can be used as a PWA icon.
     *
     * @throws RuntimeException
     */
    public static function maskable(Asset $asset, int $quality, int $padding): string
    {
        try {
            // creates image object from source
            $source = self::manager()->read($asset['content']);
            // creates a new image with the dominant color as background
            // and the size of the original image plus the padding
            $image = self::manager()->create(
                width: (int) round($asset['width'] * (1 + $padding / 100), 0),
                height: (int) round($asset['height'] * (1 + $padding / 100), 0)
            )->fill(self::getDominantColor($asset));
            // inserts the original image in the center
            $image->place(
                $source,
                position: 'center'
            );
            // scales down the new image to the original image size
            $image->scaleDown(width: $asset['width']);
            // return image data
            return (string) $image->encodeByMediaType(
                $asset['subtype'],
                /** @scrutinizer ignore-type */
                progressive: true,
                /** @scrutinizer ignore-type */
                interlaced: false,
                quality: $quality
            );
        } catch (\Exception $e) {
            throw new RuntimeException(\sprintf('Unable to make Asset "%s" maskable: %s', $asset['path'], $e->getMessage()));
        }
    }

    /**
     * Converts an image Asset to the target format.
     *
     * @throws RuntimeException
     */
    public static function convert(Asset $asset, string $format, int $quality): string
    {
        try {
            $image = self::manager()->read($asset['content']);

            if (!\function_exists("image$format")) {
                throw new RuntimeException(\sprintf('Function "image%s" is not available.', $format));
            }

            return (string) $image->encodeByExtension(
                $format,
                /** @scrutinizer ignore-type */
                progressive: true,
                /** @scrutinizer ignore-type */
                interlaced: false,
                quality: $quality
            );
        } catch (\Exception $e) {
            throw new RuntimeException(\sprintf('Unable to convert "%s" to %s: %s', $asset['path'], $format, $e->getMessage()));
        }
    }

    /**
     * Returns the Data URL (encoded in Base64).
     *
     * @throws RuntimeException
     */
    public static function getDataUrl(Asset $asset, int $quality): string
    {
        try {
            $image = self::manager()->read($asset['content']);

            return (string) $image->encode(new AutoEncoder(quality: $quality))->toDataUri();
        } catch (\Exception $e) {
            throw new RuntimeException(\sprintf('Unable to get Data URL of "%s": %s', $asset['path'], $e->getMessage()));
        }
    }

    /**
     * Returns the dominant RGB color of an image asset.
     *
     * @throws RuntimeException
     */
    public static function getDominantColor(Asset $asset): string
    {
        try {
            $image = self::manager()->read(self::resize($asset, 100, 50));

            return $image->reduceColors(1)->pickColor(0, 0)->toString();
        } catch (\Exception $e) {
            throw new RuntimeException(\sprintf('Unable to get dominant color of "%s": %s', $asset['path'], $e->getMessage()));
        }
    }

    /**
     * Returns a Low Quality Image Placeholder (LQIP) as data URL.
     *
     * @throws RuntimeException
     */
    public static function getLqip(Asset $asset): string
    {
        try {
            $image = self::manager()->read(self::resize($asset, 100, 50));

            return (string) $image->blur(50)->encode()->toDataUri();
        } catch (\Exception $e) {
            throw new RuntimeException(\sprintf('Unable to create LQIP of "%s": %s', $asset['path'], $e->getMessage()));
        }
    }

    /**
     * Build the `srcset` HTML attribute for responsive images.
     * e.g.: `srcset="/img-480.jpg 480w, /img-800.jpg 800w"`.
     *
     * $widths is an array of widths to include in the `srcset`.
     * If $notEmpty is true, the source image is always added to the `srcset`.
     *
     * @throws RuntimeException
     */
    public static function buildHtmlSrcset(Asset $asset, array $widths, $notEmpty = false): string
    {
        if (!self::isImage($asset)) {
            throw new RuntimeException(\sprintf('Unable to build "srcset" of "%s": it\'s not an image file.', $asset['path']));
        }

        $srcset = '';
        $widthMax = 0;
        sort($widths, SORT_NUMERIC);
        $widths = array_reverse($widths);
        foreach ($widths as $width) {
            if ($asset['width'] < $width) {
                continue;
            }
            $img = $asset->resize($width);
            $srcset .= \sprintf('%s %sw, ', (string) $img, $width);
            $widthMax = $width;
        }
        // adds source image
        if ((!empty($srcset) || $notEmpty) && ($asset['width'] < max($widths) && $asset['width'] != $widthMax)) {
            $srcset .= \sprintf('%s %sw', (string) $asset, $asset['width']);
        }

        return rtrim($srcset, ', ');
    }

    /**
     * Returns the value from the `$sizes` array if the class exists, otherwise returns the default size.
     */
    public static function getHtmlSizes(string $class, array $sizes = []): string
    {
        $result = '';
        $classArray = explode(' ', $class);
        foreach ($classArray as $class) {
            if (\array_key_exists($class, $sizes)) {
                $result = $sizes[$class] . ', ';
            }
        }
        if (!empty($result)) {
            return trim($result, ', ');
        }

        return $sizes['default'] ?? '100vw';
    }

    /**
     * Checks if an asset is an animated GIF.
     */
    public static function isAnimatedGif(Asset $asset): bool
    {
        // an animated GIF contains multiple "frames", with each frame having a header made up of:
        // 1. a static 4-byte sequence (\x00\x21\xF9\x04)
        // 2. 4 variable bytes
        // 3. a static 2-byte sequence (\x00\x2C)
        $count = preg_match_all('#\x00\x21\xF9\x04.{4}\x00[\x2C\x21]#s', (string) $asset['content']);

        return $count > 1;
    }

    /**
     * Returns true if asset is a SVG.
     */
    public static function isSVG(Asset $asset): bool
    {
        return \in_array($asset['subtype'], ['image/svg', 'image/svg+xml']) || $asset['ext'] == 'svg';
    }

    /**
     * Returns true if asset is an ICO.
     */
    public static function isIco(Asset $asset): bool
    {
        return \in_array($asset['subtype'], ['image/x-icon', 'image/vnd.microsoft.icon']) || $asset['ext'] == 'ico';
    }

    /**
     * Asset is a valid image?
     */
    public static function isImage(Asset $asset): bool
    {
        if ($asset['type'] !== 'image' || self::isSVG($asset) || self::isIco($asset)) {
            return false;
        }

        return true;
    }

    /**
     * Returns SVG attributes.
     *
     * @return \SimpleXMLElement|false
     */
    public static function getSvgAttributes(Asset $asset)
    {
        if (!self::isSVG($asset)) {
            return false;
        }

        if (false === $xml = simplexml_load_string($asset['content'] ?? '')) {
            return false;
        }

        return $xml->attributes();
    }
}


1			<?php
2
3			/**
4			* This file is part of Cecil.
5			*
6			* (c) Arnaud Ligny <[email protected]>
7			*
8			* For the full copyright and license information, please view the LICENSE
9			* file that was distributed with this source code.
10			*/
11
12			declare(strict_types=1);
13
14			namespace Cecil\Asset;
15
16			use Cecil\Asset;
17			use Cecil\Exception\RuntimeException;
18			use Intervention\Image\Drivers\Gd\Driver as GdDriver;
19			use Intervention\Image\Drivers\Imagick\Driver as ImagickDriver;
20			use Intervention\Image\Encoders\AutoEncoder;
21			use Intervention\Image\ImageManager;
22
23			/**
24			* Image Asset class.
25			*
26			* Provides methods to manipulate images, such as resizing, cropping, converting,
27			* and generating data URLs.
28			*
29			* This class uses the Intervention Image library to handle image processing.
30			* It supports both GD and Imagick drivers, depending on the available PHP extensions.
31			*/
32			class Image
33			{
34			/**
35			* Create new manager instance with available driver.
36			*/
37			private static function manager(): ImageManager
38			{
39			$driver = null;
40
41			// ImageMagick is available? (for a future quality option)
42			if (\extension_loaded('imagick') && class_exists('Imagick')) {
43			$driver = ImagickDriver::class;
44			}
45			// Use GD, because it's the faster driver
46			if (\extension_loaded('gd') && \function_exists('gd_info')) {
47			$driver = GdDriver::class;
48			}
49
50			if ($driver) {
51			return ImageManager::withDriver(
52			$driver,
53			[
54			'autoOrientation' => true,
55			'decodeAnimation' => true,
56			'blendingColor' => 'ffffff',
57			'strip' => true, // remove metadata
58			]
59			);
60			}
61
62			throw new RuntimeException('PHP GD (or Imagick) extension is required.');
63			}
64
65			/**
66			* Scales down an image Asset to the given width, keeping the aspect ratio.
67			*
68			* @throws RuntimeException
69			*/
70			public static function resize(Asset $asset, int $width, int $quality): string
71			{
72			try {
73			// creates image object from source
74			$image = self::manager()->read($asset['content']);
75			// resizes to $width with constraint the aspect-ratio and unwanted upsizing
76			$image->scaleDown(width: $width);
77			// return image data
78			return (string) $image->encodeByMediaType(
79			$asset['subtype'],
80			/** @scrutinizer ignore-type */
81			progressive: true,
82			/** @scrutinizer ignore-type */
83			interlaced: false,
84			quality: $quality
85			);
86			} catch (\Exception $e) {
87			throw new RuntimeException(\sprintf('Asset "%s" can\'t be resized: %s', $asset['path'], $e->getMessage()));
88			}
89			}
90
91			/**
92			* Crops an image Asset to the given width and height, keeping the aspect ratio.
93			*
94			* @throws RuntimeException
95			*/
96			public static function cover(Asset $asset, int $width, int $height, int $quality): string
97			{
98			try {
99			// creates image object from source
100			$image = self::manager()->read($asset['content']);
101			// turns an animated image (i.e GIF) into a static image
102			if ($image->isAnimated()) {
103			$image = $image->removeAnimation('25%'); // use 25% to avoid an "empty" frame
104			}
105			// crops the image
106			$image->cover(
107			width: $width,
108			height: $height,
109			position: 'center'
110			);
111			// return image data
112			return (string) $image->encodeByMediaType(
113			$asset['subtype'],
114			/** @scrutinizer ignore-type */
115			progressive: true,
116			/** @scrutinizer ignore-type */
117			interlaced: false,
118			quality: $quality
119			);
120			} catch (\Exception $e) {
121			throw new RuntimeException(\sprintf('Asset "%s" can\'t be cropped: %s', $asset['path'], $e->getMessage()));
122			}
123			}
124
125			/**
126			* Makes an image Asset maskable, meaning it can be used as a PWA icon.
127			*
128			* @throws RuntimeException
129			*/
130			public static function maskable(Asset $asset, int $quality, int $padding): string
131			{
132			try {
133			// creates image object from source
134			$source = self::manager()->read($asset['content']);
135			// creates a new image with the dominant color as background
136			// and the size of the original image plus the padding
137			$image = self::manager()->create(
138			width: (int) round($asset['width'] * (1 + $padding / 100), 0),
139			height: (int) round($asset['height'] * (1 + $padding / 100), 0)
140			)->fill(self::getDominantColor($asset));
141			// inserts the original image in the center
142			$image->place(
143			$source,
144			position: 'center'
145			);
146			// scales down the new image to the original image size
147			$image->scaleDown(width: $asset['width']);
148			// return image data
149			return (string) $image->encodeByMediaType(
150			$asset['subtype'],
151			/** @scrutinizer ignore-type */
152			progressive: true,
153			/** @scrutinizer ignore-type */
154			interlaced: false,
155			quality: $quality
156			);
157			} catch (\Exception $e) {
158			throw new RuntimeException(\sprintf('Unable to make Asset "%s" maskable: %s', $asset['path'], $e->getMessage()));
159			}
160			}
161
162			/**
163			* Converts an image Asset to the target format.
164			*
165			* @throws RuntimeException
166			*/
167			public static function convert(Asset $asset, string $format, int $quality): string
168			{
169			try {
170			$image = self::manager()->read($asset['content']);
171
172			if (!\function_exists("image$format")) {
173			throw new RuntimeException(\sprintf('Function "image%s" is not available.', $format));
174			}
175
176			return (string) $image->encodeByExtension(
177			$format,
178			/** @scrutinizer ignore-type */
179			progressive: true,
180			/** @scrutinizer ignore-type */
181			interlaced: false,
182			quality: $quality
183			);
184			} catch (\Exception $e) {
185			throw new RuntimeException(\sprintf('Unable to convert "%s" to %s: %s', $asset['path'], $format, $e->getMessage()));
186			}
187			}
188
189			/**
190			* Returns the Data URL (encoded in Base64).
191			*
192			* @throws RuntimeException
193			*/
194			public static function getDataUrl(Asset $asset, int $quality): string
195			{
196			try {
197			$image = self::manager()->read($asset['content']);
198
199			return (string) $image->encode(new AutoEncoder(quality: $quality))->toDataUri();
200			} catch (\Exception $e) {
201			throw new RuntimeException(\sprintf('Unable to get Data URL of "%s": %s', $asset['path'], $e->getMessage()));
202			}
203			}
204
205			/**
206			* Returns the dominant RGB color of an image asset.
207			*
208			* @throws RuntimeException
209			*/
210			public static function getDominantColor(Asset $asset): string
211			{
212			try {
213			$image = self::manager()->read(self::resize($asset, 100, 50));
214
215			return $image->reduceColors(1)->pickColor(0, 0)->toString();
216			} catch (\Exception $e) {
217			throw new RuntimeException(\sprintf('Unable to get dominant color of "%s": %s', $asset['path'], $e->getMessage()));
218			}
219			}
220
221			/**
222			* Returns a Low Quality Image Placeholder (LQIP) as data URL.
223			*
224			* @throws RuntimeException
225			*/
226			public static function getLqip(Asset $asset): string
227			{
228			try {
229			$image = self::manager()->read(self::resize($asset, 100, 50));
230
231			return (string) $image->blur(50)->encode()->toDataUri();
232			} catch (\Exception $e) {
233			throw new RuntimeException(\sprintf('Unable to create LQIP of "%s": %s', $asset['path'], $e->getMessage()));
234			}
235			}
236
237			/**
238			* Build the `srcset` HTML attribute for responsive images.
239			* e.g.: `srcset="/img-480.jpg 480w, /img-800.jpg 800w"`.
240			*
241			* $widths is an array of widths to include in the `srcset`.
242			* If $notEmpty is true, the source image is always added to the `srcset`.
243			*
244			* @throws RuntimeException
245			*/
246			public static function buildHtmlSrcset(Asset $asset, array $widths, $notEmpty = false): string
247			{
248			if (!self::isImage($asset)) {
249			throw new RuntimeException(\sprintf('Unable to build "srcset" of "%s": it\'s not an image file.', $asset['path']));
250			}
251
252			$srcset = '';
253			$widthMax = 0;
254			sort($widths, SORT_NUMERIC);
255			$widths = array_reverse($widths);
256			foreach ($widths as $width) {
257			if ($asset['width'] < $width) {
258			continue;
259			}
260			$img = $asset->resize($width);
261			$srcset .= \sprintf('%s %sw, ', (string) $img, $width);
262			$widthMax = $width;
263			}
264			// adds source image
265			if ((!empty($srcset) \|\| $notEmpty) && ($asset['width'] < max($widths) && $asset['width'] != $widthMax)) {
266			$srcset .= \sprintf('%s %sw', (string) $asset, $asset['width']);
267			}
268
269			return rtrim($srcset, ', ');
270			}
271
272			/**
273			* Returns the value from the `$sizes` array if the class exists, otherwise returns the default size.
274			*/
275			public static function getHtmlSizes(string $class, array $sizes = []): string
276			{
277			$result = '';
278			$classArray = explode(' ', $class);
279			foreach ($classArray as $class) {
280			if (\array_key_exists($class, $sizes)) {
281			$result = $sizes[$class] . ', ';
282			}
283			}
284			if (!empty($result)) {
285			return trim($result, ', ');
286			}
287
288			return $sizes['default'] ?? '100vw';
289			}
290
291			/**
292			* Checks if an asset is an animated GIF.
293			*/
294			public static function isAnimatedGif(Asset $asset): bool
295			{
296			// an animated GIF contains multiple "frames", with each frame having a header made up of:
297			// 1. a static 4-byte sequence (\x00\x21\xF9\x04)
298			// 2. 4 variable bytes
299			// 3. a static 2-byte sequence (\x00\x2C)
300			$count = preg_match_all('#\x00\x21\xF9\x04.{4}\x00[\x2C\x21]#s', (string) $asset['content']);
301
302			return $count > 1;
303			}
304
305			/**
306			* Returns true if asset is a SVG.
307			*/
308			public static function isSVG(Asset $asset): bool
309			{
310			return \in_array($asset['subtype'], ['image/svg', 'image/svg+xml']) \|\| $asset['ext'] == 'svg';
311			}
312
313			/**
314			* Returns true if asset is an ICO.
315			*/
316			public static function isIco(Asset $asset): bool
317			{
318			return \in_array($asset['subtype'], ['image/x-icon', 'image/vnd.microsoft.icon']) \|\| $asset['ext'] == 'ico';
319			}
320
321			/**
322			* Asset is a valid image?
323			*/
324			public static function isImage(Asset $asset): bool
325			{
326			if ($asset['type'] !== 'image' \|\| self::isSVG($asset) \|\| self::isIco($asset)) {
327			return false;
328			}
329
330			return true;
331			}
332
333			/**
334			* Returns SVG attributes.
335			*
336			* @return \SimpleXMLElement\|false
337			*/
338			public static function getSvgAttributes(Asset $asset)
339			{
340			if (!self::isSVG($asset)) {
341			return false;
342			}
343
344			if (false === $xml = simplexml_load_string($asset['content'] ?? '')) {
345			return false;
346			}
347
348			return $xml->attributes();
349			}
350			}
351

Cecilapp / Cecil

Image::buildHtmlSrcset() B last analyzed 2025-10-30 11:08 UTC

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Image::buildHtmlSrcset() B
last analyzed 2025-10-30 11:08 UTC