99 lines
2.7 KiB
PHP
99 lines
2.7 KiB
PHP
<?php
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namespace Gregwar\Image;
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/**
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* Color manipulation class.
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*/
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class ImageColor
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{
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private static $colors = array(
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'black' => 0x000000,
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'silver' => 0xc0c0c0,
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'gray' => 0x808080,
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'teal' => 0x008080,
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'aqua' => 0x00ffff,
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'blue' => 0x0000ff,
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'navy' => 0x000080,
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'green' => 0x008000,
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'lime' => 0x00ff00,
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'white' => 0xffffff,
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'fuschia' => 0xff00ff,
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'purple' => 0x800080,
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'olive' => 0x808000,
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'yellow' => 0xffff00,
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'orange' => 0xffA500,
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'red' => 0xff0000,
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'maroon' => 0x800000,
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'transparent' => 0x7fffffff,
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);
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public static function gdAllocate($image, $color)
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{
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$colorRGBA = self::parse($color);
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$b = ($colorRGBA) & 0xff;
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$colorRGBA >>= 8;
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$g = ($colorRGBA) & 0xff;
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$colorRGBA >>= 8;
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$r = ($colorRGBA) & 0xff;
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$colorRGBA >>= 8;
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$a = ($colorRGBA) & 0xff;
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$c = imagecolorallocatealpha($image, $r, $g, $b, $a);
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if ($color == 'transparent') {
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imagecolortransparent($image, $c);
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}
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return $c;
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}
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public static function parse($color)
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{
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// Direct color representation (ex: 0xff0000)
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if (!is_string($color) && is_numeric($color)) {
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return $color;
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}
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// Color name (ex: "red")
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if (isset(self::$colors[$color])) {
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return self::$colors[$color];
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}
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if (is_string($color)) {
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$color_string = str_replace(' ', '', $color);
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// Color string (ex: "ff0000", "#ff0000" or "0xfff")
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if (preg_match('/^(#|0x|)([0-9a-f]{3,6})/i', $color_string, $matches)) {
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$col = $matches[2];
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if (strlen($col) == 6) {
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return hexdec($col);
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}
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if (strlen($col) == 3) {
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$r = '';
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for ($i = 0; $i < 3; ++$i) {
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$r .= $col[$i].$col[$i];
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}
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return hexdec($r);
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}
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}
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// Colors like "rgb(255, 0, 0)"
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if (preg_match('/^rgb\(([0-9]+),([0-9]+),([0-9]+)\)/i', $color_string, $matches)) {
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$r = $matches[1];
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$g = $matches[2];
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$b = $matches[3];
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if ($r >= 0 && $r <= 0xff && $g >= 0 && $g <= 0xff && $b >= 0 && $b <= 0xff) {
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return ($r << 16) | ($g << 8) | ($b);
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}
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}
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}
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throw new \InvalidArgumentException('Invalid color: '.$color);
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}
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}
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