/home/edulekha/studygroup.edulekha.com/ow_libraries/wideimage/Operation/ResizeCanvas.php
<?php
/**
* @author Gasper Kozak
* @copyright 2007-2011
This file is part of WideImage.
WideImage is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
WideImage is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with WideImage; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* @package Internal/Operations
**/
/**
* ResizeCanvas operation class
*
* @package Internal/Operations
*/
class WideImage_Operation_ResizeCanvas
{
/**
* Returns an image with a resized canvas
*
* The image is filled with $color. Use $scale to determine, when to resize.
*
* @param WideImage_Image $img
* @param smart_coordinate $width
* @param smart_coordinate $height
* @param smart_coordinate $left
* @param smart_coordinate $top
* @param int $color
* @param string $scale 'up', 'down', 'any'
* @param boolean $merge
* @return WideImage_Image
*/
function execute($img, $width, $height, $left, $top, $color, $scale, $merge)
{
$new_width = WideImage_Coordinate::fix($width, $img->getWidth());
$new_height = WideImage_Coordinate::fix($height, $img->getHeight());
if ($scale == 'down')
{
$new_width = min($new_width, $img->getWidth());
$new_height = min($new_height, $img->getHeight());
}
elseif ($scale == 'up')
{
$new_width = max($new_width, $img->getWidth());
$new_height = max($new_height, $img->getHeight());
}
$new = WideImage::createTrueColorImage($new_width, $new_height);
if ($img->isTrueColor())
{
if ($color === null)
$color = $new->allocateColorAlpha(0, 0, 0, 127);
}
else
{
imagepalettecopy($new->getHandle(), $img->getHandle());
if ($img->isTransparent())
{
$new->copyTransparencyFrom($img);
$tc_rgb = $img->getTransparentColorRGB();
$t_color = $new->allocateColorAlpha($tc_rgb);
}
if ($color === null)
{
if ($img->isTransparent())
$color = $t_color;
else
$color = $new->allocateColorAlpha(255, 0, 127, 127);
imagecolortransparent($new->getHandle(), $color);
}
}
$new->fill(0, 0, $color);
$x = WideImage_Coordinate::fix($left, $new->getWidth(), $img->getWidth());
$y = WideImage_Coordinate::fix($top, $new->getHeight(), $img->getHeight());
// blending for truecolor images
if ($img->isTrueColor())
$new->alphaBlending($merge);
// not-blending for palette images
if (!$merge && !$img->isTrueColor() && isset($t_color))
$new->getCanvas()->filledRectangle($x, $y, $x + $img->getWidth(), $y + $img->getHeight(), $t_color);
$img->copyTo($new, $x, $y);
return $new;
}
}