Improve quality of page previews in Impress/Draw with supersampling

Change-Id: I9c5b28fc32b73b2147162f74919b21d99401b501

sd/source/ui/slidesorter/cache/SlsBitmapFactory.cxx

@@ -41,10 +41,6 @@
 #include <vcl/bmpacc.hxx>
 #include <vcl/pngwrite.hxx>
 
-const static sal_Int32 gnSuperSampleFactor (2);
-const static bool gbAllowSuperSampling (false);
-
-
 namespace sd { namespace slidesorter { namespace view {
 class SlideSorterView;
 class PageObjectViewObjectContact;
@@ -73,10 +69,12 @@ Bitmap BitmapFactory::CreateBitmap (
     const bool bDoSuperSampling)
 {
     Size aSize (rPixelSize);
-    if (bDoSuperSampling && gbAllowSuperSampling)
+    if (bDoSuperSampling)
     {
-        aSize.Width() *= gnSuperSampleFactor;
-        aSize.Height() *= gnSuperSampleFactor;
+        // Supersampling factor
+        int aSuperSamplingFactor = 2;
+        aSize.Width() *= aSuperSamplingFactor;
+        aSize.Height() *= aSuperSamplingFactor;
     }
 
     Bitmap aPreview (maRenderer.RenderPage (
@@ -85,7 +83,7 @@ Bitmap BitmapFactory::CreateBitmap (
         String(),
         true,
         false).GetBitmapEx().GetBitmap());
-    if (bDoSuperSampling && gbAllowSuperSampling)
+    if (bDoSuperSampling)
     {
         aPreview.Scale(rPixelSize, BMP_SCALE_BEST);
     }

sd/source/ui/slidesorter/cache/SlsGenericPageCache.cxx

@@ -147,7 +147,7 @@ Bitmap GenericPageCache::GetPreviewBitmap (
             // i.e. the bitmap is not empty.
             if (bResize && aBitmapSize.Width()>0 && aBitmapSize.Height()>0)
             {
-                aPreview.Scale(maPreviewSize, BMP_SCALE_FAST);
+                aPreview.Scale(maPreviewSize);
             }
             bMayBeUpToDate = false;
         }
@@ -184,7 +184,7 @@ Bitmap GenericPageCache::GetMarkedPreviewBitmap (
         // i.e. the bitmap is not empty.
         if (aBitmapSize.Width()>0 && aBitmapSize.Height()>0)
         {
-            aMarkedPreview.Scale(maPreviewSize, BMP_SCALE_FAST);
+            aMarkedPreview.Scale(maPreviewSize);
         }
     }
 

sd/source/ui/slidesorter/view/SlideSorterView.cxx

@@ -819,7 +819,7 @@ void SlideSorterView::ConfigurationChanged (
         mpPreviewCache.reset(
             new cache::PageCache(
                 mpLayouter->GetPageObjectSize(),
-                false,
+                true,
                 cache::SharedCacheContext(new ViewCacheContext(mrSlideSorter))));
     }