Image Management.Watermarks

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Watermarks are visible embedded overlay on a digital photo consisting of text, a logo, or a copyright notice that discourages others from taking your digital images and using them without your permission.

In the example below this png image is used as a watermark for the iPhone photos.
To implement such a possibility, it is necessary to provide some event handlers. Technical details are as follows (click a link below to see the appropriate code):

OnBeforePageExecute event handler code.
OnCustomRenderColumn event handler code.

    function getImageWithWatermark($imagePath, $watermarkPath) {
      list($sourceWidth, $sourceHeight) = getimagesize($imagePath);
      
      $resultImage = imagecreatetruecolor($sourceWidth, $sourceHeight);
      imagesavealpha($resultImage, true);
      $background = imagecolorallocatealpha($resultImage, 0, 0, 0, 127);
      imagefill($resultImage, 0, 0, $background);
    
      $sourceImage = imagecreatefrompng($imagePath);  
      imagecopy($resultImage, $sourceImage, 0, 0, 0, 0, $sourceWidth, $sourceHeight);
      
      $watermarkImage = imagecreatefrompng($watermarkPath);
      imagecopy($resultImage, $watermarkImage, 0, 0, 0, 0, imagesx($watermarkImage), imagesy($watermarkImage));
    
      ob_start();
      imagepng($resultImage);
      $imageData = ob_get_contents();
      ob_end_clean();
      
      return $imageData;
    }

        protected function doCustomRenderColumn($fieldName, $fieldData, $rowData, &$customText, &$handled)
        { 
            if ($fieldName == 'photo_large' && !empty($fieldData)) {
              $imagePath = sprintf('external_data/images/phone/iphone_large/%s', $fieldData);
              if (FileUtils::FileExists($imagePath)) {
                $watermarkPath = 'external_data/images/watermark.png';
                $imageData = base64_encode(getImageWithWatermark($imagePath, $watermarkPath));
                $src = 'data:image/png;base64,'.$imageData;
                $customText = str_replace($imagePath, $src, $customText);
                $handled = true;
              }
            }
        }

Model Name	Apple iPhone XS
Release Year	2018
Display Size	5.8
Colors	Gold,Silver,Space Gray
Photo

Model Name	Apple iPhone XR
Release Year	2018
Display Size	6.1
Colors	Black,Blue,Coral,Red,Yellow,White
Photo

Model Name	Apple iPhone X
Release Year	2017
Display Size	5.8
Colors	Silver,Space Gray
Photo

Model Name	Apple iPhone 8 Plus
Release Year	2017
Display Size	5.5
Colors	Gold,Silver,Space Gray
Photo

Model Name	Apple iPhone 8
Release Year	2017
Display Size	4.7
Colors	Gold,Silver,Space Gray
Photo

Model Name	Apple iPhone 7 Plus
Release Year	2016
Display Size	5.5
Colors	Black,Gold,Jet Black,Red,Rose Gold,Silver
Photo

Model Name	Apple iPhone 7
Release Year	2016
Display Size	4.7
Colors	Black,Gold,Jet Black,Red,Rose Gold,Silver
Photo

Model Name	Apple iPhone SE
Release Year	2016
Display Size	4.0
Colors	Gold,Rose Gold,Silver,Space Gray
Photo

Model Name	Apple iPhone 6s Plus
Release Year	2015
Display Size	5.5
Colors	Gold,Rose Gold,Silver,Space Gray
Photo

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