Viewing file:  ColorTable.php (1.59 KB) -rw-rw-rw-
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<?php
namespace Mpdf\Gif;
/**
* GIF Util - (C) 2003 Yamasoft (S/C)
*
* All Rights Reserved
*
* This file can be freely copied, distributed, modified, updated by anyone under the only
* condition to leave the original address (Yamasoft, http://www.yamasoft.com) and this header.
*
* @link http://www.yamasoft.com
*/
class ColorTable
{
var $m_nColors;
var $m_arColors;
public function __construct()
{
unset($this->m_nColors);
unset($this->m_arColors);
}
function load($lpData, $num)
{
$this->m_nColors = 0;
$this->m_arColors = [];
for ($i = 0; $i < $num; $i++) {
$rgb = substr($lpData, $i * 3, 3);
if (strlen($rgb) < 3) {
return false;
}
$this->m_arColors[] = (ord($rgb[2]) << 16) + (ord($rgb[1]) << 8) + ord($rgb[0]);
$this->m_nColors++;
}
return true;
}
function toString()
{
$ret = "";
for ($i = 0; $i < $this->m_nColors; $i++) {
$ret .=
chr(($this->m_arColors[$i] & 0x000000FF)) . // R
chr(($this->m_arColors[$i] & 0x0000FF00) >> 8) . // G
chr(($this->m_arColors[$i] & 0x00FF0000) >> 16); // B
}
return $ret;
}
function colorIndex($rgb)
{
$rgb = intval($rgb) & 0xFFFFFF;
$r1 = ($rgb & 0x0000FF);
$g1 = ($rgb & 0x00FF00) >> 8;
$b1 = ($rgb & 0xFF0000) >> 16;
$idx = -1;
for ($i = 0; $i < $this->m_nColors; $i++) {
$r2 = ($this->m_arColors[$i] & 0x000000FF);
$g2 = ($this->m_arColors[$i] & 0x0000FF00) >> 8;
$b2 = ($this->m_arColors[$i] & 0x00FF0000) >> 16;
$d = abs($r2 - $r1) + abs($g2 - $g1) + abs($b2 - $b1);
if (($idx == -1) || ($d < $dif)) {
$idx = $i;
$dif = $d;
}
}
return $idx;
}
}
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