Namespaces

Classes

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: * AsNegative operation class
30: *
31: * @package Internal/Operations
32: */
33: class AsNegative
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: $palette = !$image->isTrueColor();
44: $transparent = $image->isTransparent();
45:
46: if ($palette && $transparent) {
47: $tcrgb = $image->getTransparentColorRGB();
48: }
49:
50: $new = $image->asTrueColor();
51:
52: if (!imagefilter($new->getHandle(), IMG_FILTER_NEGATE)) {
53: throw new GDFunctionResultException("imagefilter() returned false");
54: }
55:
56: if ($palette) {
57: $new = $new->asPalette();
58:
59: if ($transparent) {
60: $irgb = array('red' => 255 - $tcrgb['red'], 'green' => 255 - $tcrgb['green'], 'blue' => 255 - $tcrgb['blue'], 'alpha' => 127);
61:
62: // needs imagecolorexactalpha instead of imagecolorexact, otherwise doesn't work on some transparent GIF images
63: $new_tci = imagecolorexactalpha($new->getHandle(), $irgb['red'], $irgb['green'], $irgb['blue'], 127);
64: $new->setTransparentColor($new_tci);
65: }
66: }
67:
68: return $new;
69: }
70: }
71:
API documentation generated by ApiGen v7.0.0-alpha.6