public function testImageResize()
{
$extension = 'png';
$sourceFile = __DIR__ . '/wiki_logo.' . $extension;
$targetFile = __DIR__ . '/wiki_logo_new.' . $extension;
$width = 50;
$height = 50;
ImageManager::resizeImage($sourceFile, $width, $height, $targetFile);
$attributes = ImageManager::getImageAttributes($targetFile);
$this->assertEquals($width, $attributes['width']);
$this->assertEquals($height, $attributes['height']);
$this->assertEquals($extension, $attributes['type']);
unlink($targetFile);
}
/**
* Resizes an image to the given dimensions. If a target image is given, the file is saved to
* the desired file.
*
* @param string $sourceImage full qualified path to the image file.
* @param int $width width of the adjusted image.
* @param int $height height of the adjusted image.
* @param string $targetImage full qualified path to the target image.
* @param int $jpgQuality The jpg quality (0-100).
* @param int $pngCompression The png compression level (0-9).
*
* @throws InvalidArgumentException In case the applied image does not exist.
*
* @author Christian Achatz
* @version
* Version 0.1, 31.01.2009<br />
* Version 0.2, 01.05.2013 (Werner Liemberger: added pngCompression and bug-fix of the way the target image is saved.
* Version 0.3, 11.10.2015 (ID#260: added safety check)<br />
*/
public static function resizeImage($sourceImage, $width, $height, $targetImage = null, $jpgQuality = 80, $pngCompression = 0)
{
// check if the image is present on disk
if (!file_exists($sourceImage)) {
throw new InvalidArgumentException('[ImageManager::resizeImage()] The given image ("' . $sourceImage . '") does not exist! Hence, it cannot be adjusted.', E_USER_ERROR);
}
// ID#260: check whether target image is really null and NOT empty to avoid issues
if ($targetImage !== null && empty($targetImage)) {
throw new InvalidArgumentException('[ImageManager::resizeImage()] The target image name is empty! ' . 'Hence, it cannot be adjusted.', E_USER_ERROR);
}
// gather the current dimensions of the image
$attributes = ImageManager::getImageAttributes($sourceImage);
$sourceImageWidth = $attributes['width'];
$sourceImageHeight = $attributes['height'];
$sourceImageType = $attributes['type'];
// create the current and the target image stream
if ($sourceImageType == 'jpg') {
$sourceImageStream = imagecreatefromjpeg($sourceImage);
$targetImageStream = imagecreatetruecolor($width, $height);
} elseif ($sourceImageType == 'gif') {
$sourceImageStream = imagecreatefromgif($sourceImage);
$targetImageStream = imagecreate($width, $height);
} else {
$sourceImageStream = imagecreatefrompng($sourceImage);
$targetImageStream = imagecreate($width, $height);
}
// copy transparency if we resize a gif image
if ($sourceImageType == 'gif') {
// query the transparency color
$transparentColor = imagecolortransparent($sourceImageStream);
// copy palette
imagepalettecopy($targetImageStream, $sourceImageStream);
// fill with transparent color
imagefill($targetImageStream, 0, 0, $transparentColor);
// declare the transparent color as transparent :)
imagecolortransparent($targetImageStream, $transparentColor);
}
// copy source image stream to target image stream and resize it
imagecopyresized($targetImageStream, $sourceImageStream, 0, 0, 0, 0, $width, $height, $sourceImageWidth, $sourceImageHeight);
if ($targetImage !== null) {
// Get image type. The target image won't exist before the operation,
// therefore the getimagesize() function from getImageAttributes
// produces a read error. That's the reason why the image type is...
$fileNamePartsArray = explode('.', $targetImage);
$targetImageType = end($fileNamePartsArray);
$targetImageType = strtolower($targetImageType);
// sometimes the file extension name is written with an "e", so correct that
$targetImageType = str_replace('jpeg', 'jpg', $targetImageType);
switch ($targetImageType) {
case 'jpg':
imagejpeg($targetImageStream, $targetImage, $jpgQuality);
break;
case 'gif':
imagegif($targetImageStream, $targetImage);
break;
case 'png':
imagepng($targetImageStream, $targetImage, $pngCompression);
break;
default:
throw new InvalidArgumentException('[ImageManager::resizeImage()] The targetImage extension ("' . $targetImageType . '") does not match "jpg", "png", or "gif"!', E_USER_ERROR);
}
} else {
switch ($sourceImageType) {
case 'jpg':
imagejpeg($targetImageStream, '', $jpgQuality);
break;
case 'gif':
imagegif($targetImageStream, '');
break;
default:
imagepng($targetImageStream, '', $pngCompression);
}
}
// clean memory
imagedestroy($targetImageStream);
imagedestroy($sourceImageStream);
}
