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namespace Alpha\Util\Image;
use Alpha\Exception\IllegalArguementException;
/**
* A utility class for carrying out various image file tasks.
*
* @since 1.1
*
* @author John Collins <dev@alphaframework.org>
* @license http://www.opensource.org/licenses/bsd-license.php The BSD License
* @copyright Copyright (c) 2018, John Collins (founder of Alpha Framework).
* All rights reserved.
*
* <pre>
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the
* following conditions are met:
*
* * Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
* * Neither the name of the Alpha Framework nor the names
* of its contributors may be used to endorse or promote
* products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* </pre>
*/
class ImageUtils
{
/**
* Generates a perfectly square thumbnail from the supplied original image file.
*
* @param string $original The path to the original file
* @param string $thumbnail The path to the new thumbnail file to generate
* @param int $dimensions The width/height of the generated thumbnail
*
* @throws \Alpha\Exception\IllegalArguementException
*
* @since 1.1
*/
public static function generateSquareThumbnail($original, $thumbnail, $dimensions)
{
if ($dimensions <= 0) {
throw new IllegalArguementException('Illegal dimensions value provided ['.$dimensions.'], should be greater than zero');
}
$newImage = imagecreatetruecolor($dimensions, $dimensions);
$imageInfo = getimagesize($original);
$originalX = 0;
switch ($imageInfo['mime']) {
case 'image/jpeg':
$type = 'jpg';
$originalImage = imagecreatefromjpeg($original);
break;
case 'image/gif':
$type = 'gif';
$originalImage = imagecreatefromgif($original);
break;
case 'image/png':
$type = 'png';
$originalImage = imagecreatefrompng($original);
break;
default:
throw new IllegalArguementException('Unsupported image format ['.$imageInfo['mime'].']');
}
// in case the destination type is different from the source...
$pathParts = pathinfo($thumbnail);
if (!isset($pathParts['extension'])) {
$type = $pathParts['extension'];
}
list($originalWidth, $originalHeight) = $imageInfo;
if ($originalWidth > $originalHeight) {
$originalX = floor(($originalWidth-$originalHeight)/2);
$sourceWidth = $sourceHeight = $originalHeight;
} else {
$sourceWidth = $sourceHeight = $originalWidth;
}
imagecopyresampled($newImage, $originalImage, 0, 0, $originalX, 0, $dimensions, $dimensions, $sourceWidth, $sourceHeight);
return self::saveImage($newImage, $type, $thumbnail);
}
/**
* Saves the GD image resource to the file path indicated.
*
* @param resource $imageResource The GD image resource to save
* @param string $type The image type (jpg, png, or gif)
* @param string $destination The desination file path of the image file to create
*
* @throws \Alpha\Exception\IllegalArguementException
*
* @since 1.1
*/
public static function saveImage($imageResource, $type, $destination)
{
if (!in_array($type, array('jpg', 'png', 'gif'))) {
throw new IllegalArguementException('Illegal image type ['.$type.'], cannot create file');
}
if (($type == 'jpg')) {
imagejpeg($imageResource, $destination);
} else {
$function = 'image'.$type;
$function($imageResource, $destination);
}
// free up memory
imagedestroy($imageResource);
}
}