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\PaletteImage; |
27: | |
28: | /** |
29: | * CopyChannelsPalette operation class |
30: | * |
31: | * This operation is intended to be used on palette images |
32: | * |
33: | * @package Internal/Operations |
34: | */ |
35: | class CopyChannelsPalette |
36: | { |
37: | /** |
38: | * Returns an image with only specified channels copied |
39: | * |
40: | * @param \WideImage\PaletteImage $img |
41: | * @param array $channels |
42: | * @return \WideImage\PaletteImage |
43: | */ |
44: | public function execute($img, $channels) |
45: | { |
46: | $blank = array('red' => 0, 'green' => 0, 'blue' => 0); |
47: | |
48: | if (isset($channels['alpha'])) { |
49: | unset($channels['alpha']); |
50: | } |
51: | |
52: | $width = $img->getWidth(); |
53: | $height = $img->getHeight(); |
54: | $copy = PaletteImage::create($width, $height); |
55: | |
56: | if ($img->isTransparent()) { |
57: | $otci = $img->getTransparentColor(); |
58: | $TRGB = $img->getColorRGB($otci); |
59: | $tci = $copy->allocateColor($TRGB); |
60: | } else { |
61: | $otci = null; |
62: | $tci = null; |
63: | } |
64: | |
65: | for ($x = 0; $x < $width; $x++) { |
66: | for ($y = 0; $y < $height; $y++) { |
67: | $ci = $img->getColorAt($x, $y); |
68: | |
69: | if ($ci === $otci) { |
70: | $copy->setColorAt($x, $y, $tci); |
71: | continue; |
72: | } |
73: | |
74: | $RGB = $img->getColorRGB($ci); |
75: | |
76: | $newRGB = $blank; |
77: | |
78: | foreach ($channels as $channel) { |
79: | $newRGB[$channel] = $RGB[$channel]; |
80: | } |
81: | |
82: | $color = $copy->getExactColor($newRGB); |
83: | |
84: | if ($color == -1) { |
85: | $color = $copy->allocateColor($newRGB); |
86: | } |
87: | |
88: | $copy->setColorAt($x, $y, $color); |
89: | } |
90: | } |
91: | |
92: | if ($img->isTransparent()) { |
93: | $copy->setTransparentColor($tci); |
94: | } |
95: | |
96: | return $copy; |
97: | } |
98: | } |
99: |