tdf#141415 speed up a perf hotspot in SalLayout

a translation is just 2 additions, no need to do expensive matrix math

Change-Id: I76949e6168acc8c50ade358fdccb61575b59a5e7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/183220
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Jenkins

basegfx/source/range/b2drange.cxx

@@ -48,6 +48,17 @@ namespace basegfx
         }
     }
 
+    void B2DRange::translate(double fTranslateX, double fTranslateY)
+    {
+        if(!(fTools::equalZero(fTranslateX) && fTools::equalZero(fTranslateY)))
+        {
+            *this = basegfx::B2DRange(fTranslateX + getMinX(),
+                                      fTranslateY + getMinY(),
+                                      fTranslateX + getMaxX(),
+                                      fTranslateY + getMaxY());
+        }
+    }
+
     B2DRange& B2DRange::operator*=(const basegfx::B2DHomMatrix& rMatrix)
     {
         transform(rMatrix);

include/basegfx/range/b2drange.hxx

@@ -114,6 +114,15 @@ namespace basegfx
         /** Transform Range by given transformation matrix. */
         BASEGFX_DLLPUBLIC void transform(const B2DHomMatrix& rMatrix);
 
+        /** Translate Range (ie. move).
+            Much faster equivalent of transform(createTranslateB2DHomMatrix(xx)). */
+        BASEGFX_DLLPUBLIC void translate(double fTranslateX, double fTranslateY);
+
+        inline void translate(const B2DTuple& rTranslate)
+        {
+            translate(rTranslate.getX(), rTranslate.getY());
+        }
+
         /** Transform Range by given transformation matrix.
 
             This operation transforms the Range by transforming all four possible

vcl/source/gdi/sallayout.cxx

@@ -236,7 +236,8 @@ bool SalLayout::GetBoundRect(basegfx::B2DRectangle& rRect) const
         {
             if (!aRectangle.isEmpty())
             {
-                aRectangle.transform(basegfx::utils::createTranslateB2DHomMatrix(aPos));
+                // translate rectangle to correct position
+                aRectangle.translate(aPos);
                 // merge rectangle
                 rRect.expand(aRectangle);
             }