blue-twilight/app/Helpers/ImageHelper.php
2016-09-05 14:06:41 +01:00

100 lines
2.6 KiB
PHP

<?php
namespace App\Helpers;
use App\AlbumSources\IAlbumSource;
use App\Photo;
class ImageHelper
{
public function generateThumbnail($gdImageResource, Photo $photo, $thumbnailInfo)
{
$thumbnailWidth = intval($thumbnailInfo['width']);
$thumbnailHeight = intval($thumbnailInfo['height']);
// If image is portrait, restrict the height by the relevant aspect ratio
if ($photo->height > $photo->width)
{
$aspectRatio = $photo->height / $photo->width;
$thumbnailWidth = intval($thumbnailInfo['height']) / $aspectRatio;
$thumbnailHeight = intval($thumbnailInfo['height']);
}
$thumbnailImageResource = imagecreatetruecolor($thumbnailWidth, $thumbnailHeight);
imagecopyresized(
$thumbnailImageResource,
$gdImageResource,
0,
0,
0,
0,
$thumbnailWidth,
$thumbnailHeight,
$photo->width,
$photo->height
);
// TODO make the /tmp folder configurable
$tempName = tempnam('/tmp', 'btw_thumb_');
$tempNameWithExtension = ($tempName . '.jpg');
rename($tempName, $tempNameWithExtension);
// TODO make thumbnail quality configurable
imagejpeg($thumbnailImageResource, $tempNameWithExtension, 90);
return $tempNameWithExtension;
}
public function openImage($imagePath, &$imageInfo)
{
$imageInfo = getimagesize($imagePath);
if ($imageInfo === false)
{
throw new \Exception(sprintf('The image "%s" does not appear to be a valid image, or cannot be read', pathinfo($imagePath, PATHINFO_FILENAME)));
}
$im = false;
$type = $imageInfo[2];
$allowedTypes = [
IMG_GIF,
IMG_PNG,
IMG_JPEG,
IMG_WBMP
];
if (!in_array($type, $allowedTypes))
{
return false;
}
switch ($type)
{
case IMG_GIF:
$im = imagecreatefromgif($imagePath);
break;
case IMG_JPEG:
$im = imagecreatefromjpeg($imagePath);
break;
case IMG_PNG:
$im = imagecreatefrompng($imagePath);
break;
case IMG_WBMP:
$im = imagecreatefromwbmp($imagePath);
break;
}
return $im;
}
public function rotateImage($imageResource, $angle)
{
imagesetinterpolation($imageResource, IMG_SINC);
return imagerotate($imageResource, $angle, 0);
}
}