fixing issue #330: background images do not work for master slides

Author: Peter Lind

src/PhpPresentation/Writer/PowerPoint2007/PptSlideMasters.php

@@ -11,6 +11,7 @@
 use PhpOffice\PhpPresentation\Slide;
 use PhpOffice\PhpPresentation\Slide\SlideMaster;
 use PhpOffice\PhpPresentation\Style\SchemeColor;
+use PhpOffice\PhpPresentation\Slide\Background\Image;
 
 class PptSlideMasters extends AbstractSlide
 {
@@ -24,6 +25,13 @@ public function render()
             $this->oZip->addFromString('ppt/slideMasters/_rels/slideMaster' . $oMasterSlide->getRelsIndex() . '.xml.rels', $this->writeSlideMasterRelationships($oMasterSlide));
             // Add the information from the masterSlide to the ZIP file
             $this->oZip->addFromString('ppt/slideMasters/slideMaster' . $oMasterSlide->getRelsIndex() . '.xml', $this->writeSlideMaster($oMasterSlide));
+
+            // Add background image slide
+            $oBkgImage = $oMasterSlide->getBackground();
+            if ($oBkgImage instanceof Image) {
+                $this->oZip->addFromString('ppt/media/' . $oBkgImage->getIndexedFilename($oMasterSlide->getRelsIndex()), file_get_contents($oBkgImage->getPath()));
+            }
+
         }
 
         return $this->oZip;
@@ -55,7 +63,16 @@ public function writeSlideMasterRelationships(SlideMaster $oMasterSlide)
             $slideLayout->relationId = 'rId' . $relId;
         }
         // Write drawing relationships?
+
         $this->writeDrawingRelations($oMasterSlide, $objWriter, $relId);
+
+        // Write background relationships?
+        $oBackground = $oMasterSlide->getBackground();
+        if ($oBackground instanceof Image) {
+            $this->writeRelationship($objWriter, ++$relId, 'http://schemas.openxmlformats.org/officeDocument/2006/relationships/image', '../media/' . $oBackground->getIndexedFilename($oMasterSlide->getRelsIndex()));
+            $oBackground->relationId = 'rId' . $relId;
+        }
+
         // TODO: Write hyperlink relationships?
         // TODO: Write comment relationships
         // Relationship theme/theme1.xml