/usr/share/php/Horde/Image.php is in php-horde-image 2.1.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
* This class provides some utility functions, such as generating highlights
* of a color as well as a factory method responsible for creating a concrete
* Horde_Image driver.
*
* Copyright 2002-2014 Horde LLC (http://www.horde.org/)
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.horde.org/licenses/lgpl21.
*
* @author Chuck Hagenbuch <chuck@horde.org>
* @author Michael J. Rubinsky <mrubinsk@horde.org>
* @package Image
*/
class Horde_Image
{
/**
* Calculate a lighter (or darker) version of a color.
*
* @param string $color An HTML color, e.g.: #ffffcc.
* @param string $factor TODO
*
* @return string A modified HTML color.
*/
static public function modifyColor($color, $factor = 0x11)
{
list($r, $g, $b) = self::getColor($color);
$r = min(max($r + $factor, 0), 255);
$g = min(max($g + $factor, 0), 255);
$b = min(max($b + $factor, 0), 255);
return '#' . str_pad(dechex($r), 2, '0', STR_PAD_LEFT) . str_pad(dechex($g), 2, '0', STR_PAD_LEFT) . str_pad(dechex($b), 2, '0', STR_PAD_LEFT);
}
/**
* Calculate a more intense version of a color.
*
* @param string $color An HTML color, e.g.: #ffffcc.
* @param string $factor TODO
*
* @return string A more intense HTML color.
*/
static public function moreIntenseColor($color, $factor = 0x11)
{
list($r, $g, $b) = self::getColor($color);
if ($r >= $g && $r >= $b) {
$g = $g / $r;
$b = $b / $r;
$r += $factor;
$g = floor($g * $r);
$b = floor($b * $r);
} elseif ($g >= $r && $g >= $b) {
$r = $r / $g;
$b = $b / $g;
$g += $factor;
$r = floor($r * $g);
$b = floor($b * $g);
} else {
$r = $r / $b;
$g = $g / $b;
$b += $factor;
$r = floor($r * $b);
$g = floor($g * $b);
}
$r = min(max($r, 0), 255);
$g = min(max($g, 0), 255);
$b = min(max($b, 0), 255);
return '#' . str_pad(dechex($r), 2, '0', STR_PAD_LEFT) . str_pad(dechex($g), 2, '0', STR_PAD_LEFT) . str_pad(dechex($b), 2, '0', STR_PAD_LEFT);
}
/**
* Returns the brightness of a color.
*
* @param string $color An HTML color, e.g.: #ffffcc.
*
* @return integer The brightness on a scale of 0 to 255.
*/
static public function brightness($color)
{
list($r, $g, $b) = self::getColor($color);
return round((($r * 299) + ($g * 587) + ($b * 114)) / 1000);
}
/**
* @TODO
*/
static public function grayscaleValue($r, $g, $b)
{
return round(($r * 0.30) + ($g * 0.59) + ($b * 0.11));
}
/**
* @TODO
*/
static public function grayscalePixel($originalPixel)
{
$gray = Horde_Image::grayscaleValue($originalPixel['red'], $originalPixel['green'], $originalPixel['blue']);
return array('red'=>$gray, 'green'=>$gray, 'blue'=>$gray);
}
/**
* Normalizes an HTML color.
*
* @param string $color An HTML color, e.g.: #ffffcc or #ffc.
*
* @return array Array with three elements: red, green, and blue.
*/
static public function getColor($color)
{
if ($color[0] == '#') {
$color = substr($color, 1);
}
if (strlen($color) == 3) {
$color = str_repeat($color[0], 2) .
str_repeat($color[1], 2) .
str_repeat($color[2], 2);
}
return array(
hexdec(substr($color, 0, 2)),
hexdec(substr($color, 2, 2)),
hexdec(substr($color, 4, 2))
);
}
/**
* Get the RGB value for a given colorname.
*
* @param string $colorname The colorname
*
* @return array An array of RGB values.
*/
static public function getRGB($colorname)
{
require_once __DIR__ . '/Image/rgb.php';
return isset($GLOBALS['horde_image_rgb_colors'][$colorname]) ?
$GLOBALS['horde_image_rgb_colors'][$colorname] :
array(0, 0, 0);
}
/**
* Get the hex representation of the given colorname.
*
* @param string $colorname The colorname
*
* @return string The hex representation of the color.
*/
static public function getHexColor($colorname)
{
require_once __DIR__ . '/Image/rgb.php';
if (isset($GLOBALS['horde_image_rgb_colors'][$colorname])) {
list($r, $g, $b) = $GLOBALS['horde_image_rgb_colors'][$colorname];
return '#' . str_pad(dechex(min($r, 255)), 2, '0', STR_PAD_LEFT) . str_pad(dechex(min($g, 255)), 2, '0', STR_PAD_LEFT) . str_pad(dechex(min($b, 255)), 2, '0', STR_PAD_LEFT);
} else {
return 'black';
}
}
/**
* Get an x,y pair on circle, assuming center is 0,0.
*
* @access private
*
* @param double $degrees The degrees of arc to get the point for.
* @param integer $diameter The diameter of the circle.
*
* @return array (x coordinate, y coordinate) of the point.
*/
static public function circlePoint($degrees, $diameter)
{
// Avoid problems with doubles.
$degrees += 0.0001;
return array(cos(deg2rad($degrees)) * ($diameter / 2),
sin(deg2rad($degrees)) * ($diameter / 2));
}
/**
* Get point coordinates at the limits of an arc. Only valid for
* angles ($end - $start) <= 45 degrees.
*
* @access private
*
* @param integer $r The radius of the arc.
* @param integer $start The starting angle.
* @param integer $end The ending angle.
*
* @return array The start point, end point, and anchor point.
*/
static public function arcPoints($r, $start, $end)
{
// Start point.
$pts['x1'] = $r * cos(deg2rad($start));
$pts['y1'] = $r * sin(deg2rad($start));
// End point.
$pts['x2'] = $r * cos(deg2rad($end));
$pts['y2'] = $r * sin(deg2rad($end));
// Anchor point.
$a3 = ($start + $end) / 2;
$r3 = $r / cos(deg2rad(($end - $start) / 2));
$pts['x3'] = $r3 * cos(deg2rad($a3));
$pts['y3'] = $r3 * sin(deg2rad($a3));
return $pts;
}
/**
* Return point size for font
*/
static public function getFontSize($fontsize)
{
switch ($fontsize) {
case 'medium':
$point = 18;
break;
case 'large':
$point = 24;
break;
case 'giant':
$point = 30;
break;
default:
$point = 12;
}
return $point;
}
}
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