File class\libraries\vendor\smottt\wideimage\lib\WideImage\Operation\GetMask.php

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\TrueColorImage;
27:
28:	/**
29:	* GetMask operation class
30:	*
31:	* @package Internal/Operations
32:	*/
33:	class GetMask
34:	{
35:	/**
36:	* Returns a mask
37:	*
38:	* @param \WideImage\Image $image
39:	* @return \WideImage\Image
40:	*/
41:	public function execute($image)
42:	{
43:	$width = $image->getWidth();
44:	$height = $image->getHeight();
45:
46:	$mask = TrueColorImage::create($width, $height);
47:	$mask->setTransparentColor(-1);
48:	$mask->alphaBlending(false);
49:	$mask->saveAlpha(false);
50:
51:	for ($i = 0; $i <= 255; $i++) {
52:	$greyscale[$i] = ImageColorAllocate($mask->getHandle(), $i, $i, $i);
53:	}
54:
55:	imagefilledrectangle($mask->getHandle(), 0, 0, $width, $height, $greyscale[255]);
56:
57:	$transparentColor = $image->getTransparentColor();
58:	$alphaToGreyRatio = 255 / 127;
59:
60:	for ($x = 0; $x < $width; $x++) {
61:	for ($y = 0; $y < $height; $y++) {
62:	$color = $image->getColorAt($x, $y);
63:
64:	if ($color == $transparentColor) {
65:	$rgba['alpha'] = 127;
66:	} else {
67:	$rgba = $image->getColorRGB($color);
68:	}
69:
70:	imagesetpixel($mask->getHandle(), $x, $y, $greyscale[255 - round($rgba['alpha'] * $alphaToGreyRatio)]);
71:	}
72:	}
73:
74:	return $mask;
75:	}
76:	}
77:

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