| 1 | <?php |
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| 15 | class MonoImageFilter |
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| 16 | { |
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| 17 | /** |
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| 18 | * Select CCITT Group 3 or 4 facsimile encoding |
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| 19 | */ |
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| 20 | const CCITT_FAX_ENCODE = 'CCITTFaxEncode'; |
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| 21 | |||
| 22 | /** |
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| 23 | * Select Flate (ZIP) compression |
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| 24 | */ |
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| 25 | const FLATE_ENCODE = 'FlateEncode'; |
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| 26 | |||
| 27 | /** |
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| 28 | * Select run length encoding |
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| 29 | */ |
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| 30 | const RUN_LENGTH_ENCODE = 'RunLengthEncode'; |
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| 31 | |||
| 32 | /** |
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| 33 | * Available monochrome image filter values |
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| 34 | * |
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| 35 | * @var string[] |
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| 36 | */ |
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| 37 | private static $values = [ |
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| 38 | self::CCITT_FAX_ENCODE, |
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| 39 | self::FLATE_ENCODE, |
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| 40 | self::RUN_LENGTH_ENCODE |
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| 41 | ]; |
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| 42 | |||
| 43 | /** |
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| 44 | * Get available monochrome image filter values |
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| 45 | * |
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| 46 | * @return string[] |
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| 47 | */ |
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| 48 | public static function values() |
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| 52 | } |
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| 53 |