Add watermark to medical checkup report

application/controllers/tools/Medical_checkup_report.php

@@ -6,6 +6,17 @@ class MedicalCheckupReportPdf extends FPDF
 {
     public $printBy = 'ADMIN';
     public $branchAddress = '-';
+    public $watermarkPath = '';
+
+    public function Header()
+    {
+        if ($this->watermarkPath === '' || !file_exists($this->watermarkPath)) {
+            return;
+        }
+
+        // Draw watermark background per page.
+        $this->Image($this->watermarkPath, 23, 102, 164, 102, 'JPEG');
+    }
 
     public function Footer()
     {
@@ -91,6 +102,7 @@ class Medical_checkup_report extends MY_Controller
             $pdf->AliasNbPages();
             $pdf->printBy = $printBy;
             $pdf->branchAddress = (string)$branch['branch_address'];
+            $pdf->watermarkPath = dirname(APPPATH) . '/assets/images/watermark-ibl.jpeg';
             $pdf->AddPage();
 
             // Header offset 3.5 cm for pre-printed kop.