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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Css\Value; |
| 6 | |
| 7 | /** |
| 8 | * One `<image> [<resolution>]? [type(<mime>)]?` entry inside an |
| 9 | * `image-set()`. |
| 10 | * |
| 11 | * - `image` is either a {@see Url} or a {@see StringValue} |
| 12 | * (the parser accepts both `url(foo.png)` and `"foo.png"`). |
| 13 | * - `resolutionDppx` carries the entry's resolution in dppx |
| 14 | * (dots-per-pixel) — `1x` = 1.0, `2x` = 2.0, `192dpi` = 2.0, |
| 15 | * etc. Null when the author omitted a resolution. |
| 16 | * - `mimeType` is the entry's `type(<string>)` MIME hint |
| 17 | * (e.g. `image/svg+xml`). Null when omitted. |
| 18 | */ |
| 19 | final readonly class ImageSetOption |
| 20 | { |
| 21 | public function __construct( |
| 22 | public Value $image, |
| 23 | public ?float $resolutionDppx = null, |
| 24 | public ?string $mimeType = null, |
| 25 | ) {} |
| 26 | |
| 27 | public function toCss(): string |
| 28 | { |
| 29 | $parts = [$this->image->toCss()]; |
| 30 | if ($this->resolutionDppx !== null) { |
| 31 | $parts[] = self::formatResolution($this->resolutionDppx); |
| 32 | } |
| 33 | if ($this->mimeType !== null) { |
| 34 | $parts[] = 'type("' . $this->mimeType . '")'; |
| 35 | } |
| 36 | return implode(' ', $parts); |
| 37 | } |
| 38 | |
| 39 | private static function formatResolution(float $dppx): string |
| 40 | { |
| 41 | return fmod($dppx, 1.0) === 0.0 |
| 42 | ? ((int) $dppx) . 'x' |
| 43 | : $dppx . 'x'; |
| 44 | } |
| 45 | } |