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Llewellyn van der Merwe
2016-01-30 22:28:43 +02:00
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admin/compiler/joomla_3/wideimage/Operation/AutoCrop.php Normal file
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<?php
/**
* @author Gasper Kozak
* @copyright 2007-2011
This file is part of WideImage.
WideImage is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
WideImage is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with WideImage; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* @package Internal/Operations
**/
/**
* AutoCrop operation
*
* @package Internal/Operations
*/
class WideImage_Operation_AutoCrop
{
/**
* Executes the auto-crop operation on the $img
*
* @param WideImage_Image $img
* @param int $rgb_threshold The difference in RGB from $base_color
* @param int $pixel_cutoff The number of pixels on each border that must be over $rgb_threshold
* @param int $base_color The color that will get cropped
* @return WideImage_Image resulting auto-cropped image
*/
function execute($img, $margin, $rgb_threshold, $pixel_cutoff, $base_color)
{
$margin = intval($margin);
$rgb_threshold = intval($rgb_threshold);
if ($rgb_threshold < 0)
$rgb_threshold = 0;
$pixel_cutoff = intval($pixel_cutoff);
if ($pixel_cutoff <= 1)
$pixel_cutoff = 1;
if ($base_color === null)
$rgb_base = $img->getRGBAt(0, 0);
else
{
if ($base_color < 0)
return $img->copy();
$rgb_base = $img->getColorRGB($base_color);
}
$cut_rect = array('left' => 0, 'top' => 0, 'right' => $img->getWidth() - 1, 'bottom' => $img->getHeight() - 1);
for ($y = 0; $y <= $cut_rect['bottom']; $y++)
{
$count = 0;
for ($x = 0; $x <= $cut_rect['right']; $x++)
{
$rgb = $img->getRGBAt($x, $y);
$diff = abs($rgb['red'] - $rgb_base['red']) + abs($rgb['green'] - $rgb_base['green']) + abs($rgb['blue'] - $rgb_base['blue']);
if ($diff > $rgb_threshold)
{
$count++;
if ($count >= $pixel_cutoff)
{
$cut_rect['top'] = $y;
break 2;
}
}
}
}
for ($y = $img->getHeight() - 1; $y >= $cut_rect['top']; $y--)
{
$count = 0;
for ($x = 0; $x <= $cut_rect['right']; $x++)
{
$rgb = $img->getRGBAt($x, $y);
$diff = abs($rgb['red'] - $rgb_base['red']) + abs($rgb['green'] - $rgb_base['green']) + abs($rgb['blue'] - $rgb_base['blue']);
if ($diff > $rgb_threshold)
{
$count++;
if ($count >= $pixel_cutoff)
{
$cut_rect['bottom'] = $y;
break 2;
}
}
}
}
for ($x = 0; $x <= $cut_rect['right']; $x++)
{
$count = 0;
for ($y = $cut_rect['top']; $y <= $cut_rect['bottom']; $y++)
{
$rgb = $img->getRGBAt($x, $y);
$diff = abs($rgb['red'] - $rgb_base['red']) + abs($rgb['green'] - $rgb_base['green']) + abs($rgb['blue'] - $rgb_base['blue']);
if ($diff > $rgb_threshold)
{
$count++;
if ($count >= $pixel_cutoff)
{
$cut_rect['left'] = $x;
break 2;
}
}
}
}
for ($x = $cut_rect['right']; $x >= $cut_rect['left']; $x--)
{
$count = 0;
for ($y = $cut_rect['top']; $y <= $cut_rect['bottom']; $y++)
{
$rgb = $img->getRGBAt($x, $y);
$diff = abs($rgb['red'] - $rgb_base['red']) + abs($rgb['green'] - $rgb_base['green']) + abs($rgb['blue'] - $rgb_base['blue']);
if ($diff > $rgb_threshold)
{
$count++;
if ($count >= $pixel_cutoff)
{
$cut_rect['right'] = $x;
break 2;
}
}
}
}
$cut_rect = array(
'left' => $cut_rect['left'] - $margin,
'top' => $cut_rect['top'] - $margin,
'right' => $cut_rect['right'] + $margin,
'bottom' => $cut_rect['bottom'] + $margin
);
if ($cut_rect['left'] < 0)
$cut_rect['left'] = 0;
if ($cut_rect['top'] < 0)
$cut_rect['top'] = 0;
if ($cut_rect['right'] >= $img->getWidth())
$cut_rect['right'] = $img->getWidth() - 1;
if ($cut_rect['bottom'] >= $img->getHeight())
$cut_rect['bottom'] = $img->getHeight() - 1;
return $img->crop($cut_rect['left'], $cut_rect['top'], $cut_rect['right'] - $cut_rect['left'] + 1, $cut_rect['bottom'] - $cut_rect['top'] + 1);
}
}