fdo#68927: sw: fix painting of SVG page background

There was a fix for a wrong constant resulting in too large image size in
a1a0830d1ac3ffabbe35bd8a0264b64f1f7a9d67, and it turns out that painting
of SVG backgrounds was relying on the wasteful rasterization:  the SVG
is rasterized only once (at the initial zoom level) and then cached, and
now the correct image size for 100% is simply scaled up when zooming in.

Fix that by painting SVGs with the drawing layer primitives instead,
which appears to give better results.

Change-Id: I4be16856fd080290526d4963d8c512beefa85363

3 files changed, 49 insertions, 25 deletions

diff --git a/sw/source/core/doc/notxtfrm.cxx b/sw/source/core/doc/notxtfrm.cxx
index e59e32ebd56c..94a37dd51484 100644
--- a/sw/source/core/doc/notxtfrm.cxx
+++ b/sw/source/core/doc/notxtfrm.cxx
@@ -735,6 +735,36 @@ bool paintUsingPrimitivesHelper(
     return false;
 }
 
+
+void paintGraphicUsingPrimitivesHelper(OutputDevice & rOutputDevice,
+         Graphic const& rGraphic, GraphicAttr const& rGraphicAttr,
+         SwRect const& rAlignedGrfArea)
+{
+    // unify using GraphicPrimitive2D
+    // -> the primitive handles all crop and mirror stuff
+    // -> the primitive renderer will create the needed pdf export data
+    // -> if bitmap content, it will be cached system-dependent
+    const basegfx::B2DRange aTargetRange(
+        rAlignedGrfArea.Left(), rAlignedGrfArea.Top(),
+        rAlignedGrfArea.Right(), rAlignedGrfArea.Bottom());
+    const basegfx::B2DHomMatrix aTargetTransform(
+        basegfx::tools::createScaleTranslateB2DHomMatrix(
+            aTargetRange.getRange(),
+            aTargetRange.getMinimum()));
+    drawinglayer::primitive2d::Primitive2DSequence aContent(1);
+
+    aContent[0] = new drawinglayer::primitive2d::GraphicPrimitive2D(
+        aTargetTransform,
+        rGraphic,
+        rGraphicAttr);
+
+    paintUsingPrimitivesHelper(
+        rOutputDevice,
+        aContent,
+        aTargetRange,
+        aTargetRange);
+}
+
 /** Paint the graphic.
 
     We require either a QuickDraw-Bitmap or a graphic here. If we do not have
@@ -857,30 +887,8 @@ void SwNoTxtFrm::PaintPicture( OutputDevice* pOut, const SwRect &rGrfArea ) cons
                 }
                 else
                 {
-                    // unify using GraphicPrimitive2D
-                    // -> the primitive handles all crop and mirror stuff
-                    // -> the primitive renderer will create the needed pdf export data
-                    // -> if bitmap conent, it will be cached system-dependent
-                    const basegfx::B2DRange aTargetRange(
-                        aAlignedGrfArea.Left(), aAlignedGrfArea.Top(),
-                        aAlignedGrfArea.Right(), aAlignedGrfArea.Bottom());
-                    const basegfx::B2DHomMatrix aTargetTransform(
-                        basegfx::tools::createScaleTranslateB2DHomMatrix(
-                            aTargetRange.getRange(),
-                            aTargetRange.getMinimum()));
-                    drawinglayer::primitive2d::Primitive2DSequence aContent;
-
-                    aContent.realloc(1);
-                    aContent[0] = new drawinglayer::primitive2d::GraphicPrimitive2D(
-                        aTargetTransform,
-                        rGrfObj.GetGraphic(),
-                        aGrfAttr);
-
-                    paintUsingPrimitivesHelper(
-                        *pOut,
-                        aContent,
-                        aTargetRange,
-                        aTargetRange);
+                    paintGraphicUsingPrimitivesHelper(*pOut,
+                            rGrfObj.GetGraphic(), aGrfAttr, aAlignedGrfArea);
                 }
             }
             else
diff --git a/sw/source/core/inc/frmtool.hxx b/sw/source/core/inc/frmtool.hxx
index e44862c958c5..341af85e1146 100644
--- a/sw/source/core/inc/frmtool.hxx
+++ b/sw/source/core/inc/frmtool.hxx
@@ -41,6 +41,8 @@ class XFillGradientItem;
 class SdrMarkList;
 class SwNodeIndex;
 class OutputDevice;
+class Graphic;
+class GraphicAttr;
 class SwPageDesc;
 
 #define FAR_AWAY LONG_MAX - 20000  // initial position of a Fly
@@ -56,6 +58,11 @@ void DrawGraphic( const SvxBrushItem *, const XFillStyleItem*, const XFillGradie
                   const SwRect &rOrg, const SwRect &rOut, const sal_uInt8 nGrfNum = GRFNUM_NO,
                   const sal_Bool bConsiderBackgroundTransparency = sal_False );
 
+void paintGraphicUsingPrimitivesHelper(
+        OutputDevice & rOutputDevice,
+        Graphic const& rGraphic, GraphicAttr const& rGraphicAttr,
+        SwRect const& rAlignedGrfArea);
+
 // method to align rectangle.
 // Created declaration here to avoid <extern> declarations
 void SwAlignRect( SwRect &rRect, const SwViewShell *pSh );
diff --git a/sw/source/core/layout/paintfrm.cxx b/sw/source/core/layout/paintfrm.cxx
index 84c5de6359fe..f2d6effc2b2b 100644
--- a/sw/source/core/layout/paintfrm.cxx
+++ b/sw/source/core/layout/paintfrm.cxx
@@ -1796,7 +1796,16 @@ static void lcl_DrawGraphic( const SvxBrushItem& rBrush, OutputDevice *pOut,
     /// Because for drawing a graphic left-top-corner and size coordinations are
     /// used, these coordinations have to be determined on pixel level.
     ::SwAlignGrfRect( &aAlignedGrfRect, *pOut );
-    pGrf->DrawWithPDFHandling( *pOut, aAlignedGrfRect.Pos(), aAlignedGrfRect.SSize() );
+
+    if (pGrf->GetGraphic().getSvgData().get())
+    {   // fdo#68927 - SVGs are rasterized badly by DrawWithPDFHandling
+        paintGraphicUsingPrimitivesHelper(*pOut,
+                pGrf->GetGraphic(), pGrf->GetAttr(), aAlignedGrfRect);
+    }
+    else
+    {
+        pGrf->DrawWithPDFHandling( *pOut, aAlignedGrfRect.Pos(), aAlignedGrfRect.SSize() );
+    }
 
     if ( bNotInside )
         pOut->Pop();