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Backgroundfill.php
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Brightness.php
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Contrast.php
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Edgedetect.php
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Emboss.php
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Grayscale.php
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Negate.php
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Sketchy.php
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Smooth.php
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Editing: Backgroundfill.php
<?php /** * Joomla! Content Management System * * @copyright (C) 2005 Open Source Matters, Inc. <https://www.joomla.org> * @license GNU General Public License version 2 or later; see LICENSE */ namespace Joomla\CMS\Image\Filter; \defined('JPATH_PLATFORM') or die; use Joomla\CMS\Image\ImageFilter; /** * Image Filter class fill background with color; * * @package Joomla.Platform * @subpackage Image * @since 3.4 */ class Backgroundfill extends ImageFilter { /** * Method to apply a background color to an image resource. * * @param array $options An array of options for the filter. * color Background matte color * * @return void * * @since 3.4 * @throws \InvalidArgumentException */ public function execute(array $options = []) { // Validate that the color value exists and is an integer. if (!isset($options['color'])) { throw new \InvalidArgumentException('No color value was given. Expected string or array.'); } $colorCode = $options['color'] ?? null; // Get resource dimensions $width = imagesx($this->handle); $height = imagesy($this->handle); // Sanitize color $rgba = $this->sanitizeColor($colorCode); // Enforce alpha on source image if (imageistruecolor($this->handle)) { imagealphablending($this->handle, false); imagesavealpha($this->handle, true); } // Create background $bg = imagecreatetruecolor($width, $height); imagesavealpha($bg, empty($rgba['alpha'])); // Allocate background color. $color = imagecolorallocatealpha($bg, $rgba['red'], $rgba['green'], $rgba['blue'], $rgba['alpha']); // Fill background imagefill($bg, 0, 0, $color); // Apply image over background imagecopy($bg, $this->handle, 0, 0, 0, 0, $width, $height); // Move flattened result onto current handle. // If handle was palette-based, it'll stay like that. imagecopy($this->handle, $bg, 0, 0, 0, 0, $width, $height); // Free up memory imagedestroy($bg); } /** * Method to sanitize color values and/or convert to an array * * @param mixed $input Associative array of colors and alpha, or hex RGBA string when alpha FF is opaque. Defaults to black and opaque alpha. * * @return array Associative array of red, green, blue and alpha * * @since 3.4 * * @note '#FF0000FF' returns an array with alpha of 0 (opaque) */ protected function sanitizeColor($input) { // Construct default values $colors = ['red' => 0, 'green' => 0, 'blue' => 0, 'alpha' => 0]; // Make sure all values are in if (\is_array($input)) { $colors = array_merge($colors, $input); } elseif (\is_string($input)) { // Convert RGBA 6-9 char string $hex = ltrim($input, '#'); $hexValues = [ 'red' => substr($hex, 0, 2), 'green' => substr($hex, 2, 2), 'blue' => substr($hex, 4, 2), 'alpha' => substr($hex, 6, 2), ]; $colors = array_map('hexdec', $hexValues); // Convert Alpha to 0..127 when provided if (\strlen($hex) > 6) { $colors['alpha'] = floor((255 - $colors['alpha']) / 2); } } else { // Cannot sanitize such type return $colors; } // Make sure each value is within the allowed range foreach ($colors as &$value) { $value = max(0, min(255, (int) $value)); } $colors['alpha'] = min(127, $colors['alpha']); return $colors; } }
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