/** * 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 $base_color The color that will get cropped * @return \WideImage\Image resulting auto-cropped image */ public function execute($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); }