/home/edulekha/studygroup.edulekha.com/ow_libraries/wideimage/Operation/Resize.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
**/
/**
* An Exception for when an invalid fit method is passed
*
* @package Internal/Operations
*/
class WideImage_Operation_InvalidFitMethodException extends WideImage_Exception {}
/**
* An Exception for when an invalid resize dimensions are passed
*
* @package Internal/Operations
*/
class WideImage_Operation_InvalidResizeDimensionException extends WideImage_Exception {}
/**
* Resize operation class
*
* @package Internal/Operations
*/
class WideImage_Operation_Resize
{
/**
* Prepares and corrects smart coordinates
*
* @param WideImage_Image $img
* @param smart_coordinate $width
* @param smart_coordinate $height
* @param string $fit
* @return array
*/
protected function prepareDimensions($img, $width, $height, $fit)
{
if ($width === null && $height === null)
{
$width = $img->getWidth();
$height = $img->getHeight();
}
if ($width !== null)
$width = WideImage_Coordinate::fix($width, $img->getWidth());
if ($height !== null)
$height = WideImage_Coordinate::fix($height, $img->getHeight());
if ($width === null)
$width = floor($img->getWidth() * $height / $img->getHeight());
if ($height === null)
$height = floor($img->getHeight() * $width / $img->getWidth());
if ($width === 0 || $height === 0)
return array('width' => 0, 'height' => 0);
if ($fit == null)
$fit = 'inside';
$dim = array();
if ($fit == 'fill')
{
$dim['width'] = $width;
$dim['height'] = $height;
}
elseif ($fit == 'inside' || $fit == 'outside')
{
$rx = $img->getWidth() / $width;
$ry = $img->getHeight() / $height;
if ($fit == 'inside')
$ratio = ($rx > $ry) ? $rx : $ry;
else
$ratio = ($rx < $ry) ? $rx : $ry;
$dim['width'] = round($img->getWidth() / $ratio);
$dim['height'] = round($img->getHeight() / $ratio);
}
else
throw new WideImage_Operation_InvalidFitMethodException("{$fit} is not a valid resize-fit method.");
return $dim;
}
/**
* Returns a resized image
*
* @param WideImage_Image $img
* @param smart_coordinate $width
* @param smart_coordinate $height
* @param string $fit
* @param string $scale
* @return WideImage_Image
*/
function execute($img, $width, $height, $fit, $scale)
{
$dim = $this->prepareDimensions($img, $width, $height, $fit);
if (($scale === 'down' && ($dim['width'] >= $img->getWidth() && $dim['height'] >= $img->getHeight())) ||
($scale === 'up' && ($dim['width'] <= $img->getWidth() && $dim['height'] <= $img->getHeight())))
$dim = array('width' => $img->getWidth(), 'height' => $img->getHeight());
if ($dim['width'] <= 0 || $dim['height'] <= 0)
throw new WideImage_Operation_InvalidResizeDimensionException("Both dimensions must be larger than 0.");
if ($img->isTransparent() || $img instanceof WideImage_PaletteImage)
{
$new = WideImage_PaletteImage::create($dim['width'], $dim['height']);
$new->copyTransparencyFrom($img);
if (!imagecopyresized(
$new->getHandle(),
$img->getHandle(),
0, 0, 0, 0,
$new->getWidth(),
$new->getHeight(),
$img->getWidth(),
$img->getHeight()))
throw new WideImage_GDFunctionResultException("imagecopyresized() returned false");
}
else
{
$new = WideImage_TrueColorImage::create($dim['width'], $dim['height']);
$new->alphaBlending(false);
$new->saveAlpha(true);
if (!imagecopyresampled(
$new->getHandle(),
$img->getHandle(),
0, 0, 0, 0,
$new->getWidth(),
$new->getHeight(),
$img->getWidth(),
$img->getHeight()))
throw new WideImage_GDFunctionResultException("imagecopyresampled() returned false");
$new->alphaBlending(true);
}
return $new;
}
}