blue-twilight/app/Helpers/ImageHelper.php

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<?php
namespace App\Helpers;
use App\AlbumSources\IAlbumSource;
use App\Photo;
class ImageHelper
{
public function flipImage($imageResource, $flipHorizontal, $flipVertical)
{
imagesetinterpolation($imageResource, $this->getInterpolationMethod());
if ($flipHorizontal && $flipVertical)
{
return imageflip($imageResource, IMG_FLIP_BOTH);
}
else if ($flipHorizontal)
{
return imageflip($imageResource, IMG_FLIP_HORIZONTAL);
}
else if ($flipVertical)
{
return imageflip($imageResource, IMG_FLIP_VERTICAL);
}
return false;
}
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
$isPortrait = false;
if ($photo->height > $photo->width)
{
$aspectRatio = $photo->height / $photo->width;
$thumbnailWidth = intval($thumbnailInfo['height']) / $aspectRatio;
$thumbnailHeight = intval($thumbnailInfo['height']);
$isPortrait = true;
}
$thumbnailImageResource = imagescale($gdImageResource, $thumbnailWidth, $thumbnailHeight, $this->getInterpolationMethod());
// If portrait, create a new canvas and paint the new picture in the centre
if ($isPortrait)
{
$newThumbnailImageResource = imagecreatetruecolor($thumbnailInfo['width'], $thumbnailInfo['height']);
// Fill in white so the space outside the portrait image is not black!
$whiteColour = imagecolorallocate($newThumbnailImageResource, 255, 255, 255);
imagefill($newThumbnailImageResource, 0, 0, $whiteColour);
imagecolordeallocate($newThumbnailImageResource, $whiteColour);
// Work out the centre position
// TODO: this may be worth implementing as a configuration option (e.g. portrait thumbnails: left-align, centre, right-align)
$leftX = ($thumbnailInfo['width'] - $thumbnailWidth) / 2;
imagecopy($newThumbnailImageResource, $thumbnailImageResource, $leftX, 0, 0, 0, $thumbnailWidth, $thumbnailHeight);
imagedestroy($thumbnailImageResource);
$thumbnailImageResource = $newThumbnailImageResource;
}
// TODO make the /tmp folder configurable
$tempName = tempnam(sys_get_temp_dir(), 'btw_thumb_');
$tempNameWithExtension = ($tempName . '.jpg');
rename($tempName, $tempNameWithExtension);
// TODO make thumbnail quality configurable
imagejpeg($thumbnailImageResource, $tempNameWithExtension, 90);
imagedestroy($thumbnailImageResource);
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, $this->getInterpolationMethod());
return imagerotate($imageResource, $angle, 0);
}
public function saveImage($imageResource, $imagePath, $imageInfo)
{
switch ($imageInfo[2])
{
case IMG_GIF:
imagegif($imageResource, $imagePath);
break;
case IMG_JPEG:
imagejpeg($imageResource, $imagePath);
break;
case IMG_PNG:
imagepng($imageResource, $imagePath);
break;
case IMG_WBMP:
imagewbmp($imageResource, $imagePath);
break;
}
}
private function getInterpolationMethod()
{
return IMG_SINC;
}
}