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