| 1: | <?php |
| 2: | /** |
| 3: | ##DOC-SIGNATURE## |
| 4: | |
| 5: | This file is part of WideImage. |
| 6: | |
| 7: | WideImage is free software; you can redistribute it and/or modify |
| 8: | it under the terms of the GNU Lesser General Public License as published by |
| 9: | the Free Software Foundation; either version 2.1 of the License, or |
| 10: | (at your option) any later version. |
| 11: | |
| 12: | WideImage is distributed in the hope that it will be useful, |
| 13: | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14: | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15: | GNU Lesser General Public License for more details. |
| 16: | |
| 17: | You should have received a copy of the GNU Lesser General Public License |
| 18: | along with WideImage; if not, write to the Free Software |
| 19: | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 20: | |
| 21: | * @package Internal/Operations |
| 22: | **/ |
| 23: | |
| 24: | namespace WideImage\Operation; |
| 25: | |
| 26: | use WideImage\Exception\GDFunctionResultException; |
| 27: | |
| 28: | /** |
| 29: | * AsGrayscale operation class |
| 30: | * |
| 31: | * @package Internal/Operations |
| 32: | */ |
| 33: | class AsGrayscale |
| 34: | { |
| 35: | /** |
| 36: | * Returns a greyscale copy of an image |
| 37: | * |
| 38: | * @param \WideImage\Image $image |
| 39: | * @return \WideImage\Image |
| 40: | */ |
| 41: | public function execute($image) |
| 42: | { |
| 43: | $new = $image->asTrueColor(); |
| 44: | |
| 45: | if (!imagefilter($new->getHandle(), IMG_FILTER_GRAYSCALE)) { |
| 46: | throw new GDFunctionResultException("imagefilter() returned false"); |
| 47: | } |
| 48: | |
| 49: | if (!$image->isTrueColor()) { |
| 50: | $new = $new->asPalette(); |
| 51: | } |
| 52: | |
| 53: | return $new; |
| 54: | } |
| 55: | } |
| 56: |