tdf#96919 - vcldemo - implement XOR rendering test.

Change-Id: Iecd8d1d1fafc9d80b40ab2069248678697dddb6c
Reviewed-on: https://gerrit.libreoffice.org/21274Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>

vcl/workben/vcldemo.cxx

@@ -958,6 +958,29 @@ public:
         }
     };
 
+    struct DrawXOR : public RegionRenderer
+    {
+        RENDER_DETAILS(xor,KEY_X,1)
+
+        virtual void RenderRegion(OutputDevice &rDev, Rectangle r,
+                                  const RenderContext &rCtx) override
+        {
+            // avoid infinite recursion
+            if (rCtx.mbVDev)
+                return;
+
+            rDev.Push();
+
+            AntialiasingFlags nFlags = rDev.GetAntialiasing();
+            rDev.SetAntialiasing(nFlags & ~AntialiasingFlags::EnableB2dDraw);
+            rDev.SetRasterOp( ROP_XOR );
+
+            rCtx.mpDemoRenderer->drawThumbs(rDev, r, true);
+
+            rDev.Pop();
+        }
+    };
+
     struct DrawIcons : public RegionRenderer
     {
         RENDER_DETAILS(icons,KEY_I,1)
@@ -1207,36 +1230,14 @@ public:
         }
     };
 
-    void drawToDevice(vcl::RenderContext& rDev, Size aSize, bool bVDev)
+    void drawThumbs(vcl::RenderContext& rDev, Rectangle aRect, bool bVDev)
     {
         RenderContext aCtx;
-        double mnStartTime;
+        aCtx.meStyle = RENDER_THUMB;
         aCtx.mbVDev = bVDev;
         aCtx.mpDemoRenderer = this;
-        aCtx.maSize = aSize;
-        Rectangle aWholeWin(Point(0,0), rDev.GetOutputSizePixel());
-
-        drawBackground(rDev, aWholeWin);
-
-        if (!bVDev /* want everything in the vdev */ &&
-            mnSelectedRenderer >= 0)
-        {
-            aCtx.meStyle = RENDER_EXPANDED;
-            RegionRenderer * r = maRenderers[mnSelectedRenderer];
-            // profiling?
-            if (getIterCount() > 0)
-            {
-                mnStartTime = getTimeNow();
-                for (int i = 0; i < r->getTestRepeatCount(); i++)
-                    r->RenderRegion(rDev, aWholeWin, aCtx);
-                addTime(mnSelectedRenderer, getTimeNow() - mnStartTime);
-            } else
-                r->RenderRegion(rDev, aWholeWin, aCtx);
-        }
-        else
-        {
-            aCtx.meStyle = RENDER_THUMB;
-            std::vector<Rectangle> aRegions(partition(aSize, mnSegmentsX, mnSegmentsY));
+        aCtx.maSize = aRect.GetSize();
+        std::vector<Rectangle> aRegions(partition(aRect, mnSegmentsX, mnSegmentsY));
         DemoRenderer::clearRects(rDev, aRegions);
         for (size_t i = 0; i < maRenderers.size(); i++)
         {
@@ -1249,22 +1250,48 @@ public:
             {
                 if (!bVDev)
                 {
-                        mnStartTime = getTimeNow();
+                    double nStartTime = getTimeNow();
                     for (int j = 0; j < r->getTestRepeatCount() * THUMB_REPEAT_FACTOR; j++)
                         r->RenderRegion(rDev, aRegions[i], aCtx);
-                        addTime(i, (getTimeNow() - mnStartTime) / THUMB_REPEAT_FACTOR);
+                    addTime(i, (getTimeNow() - nStartTime) / THUMB_REPEAT_FACTOR);
                 } else
                     for (int j = 0; j < r->getTestRepeatCount(); j++)
                         r->RenderRegion(rDev, aRegions[i], aCtx);
             }
             else
-                {
                 r->RenderRegion(rDev, aRegions[i], aCtx);
-                }
 
             rDev.SetClipRegion();
         }
     }
+
+    void drawToDevice(vcl::RenderContext& rDev, Size aSize, bool bVDev)
+    {
+        RenderContext aCtx;
+        aCtx.mbVDev = bVDev;
+        aCtx.mpDemoRenderer = this;
+        aCtx.maSize = aSize;
+        Rectangle aWholeWin(Point(0,0), rDev.GetOutputSizePixel());
+
+        drawBackground(rDev, aWholeWin);
+
+        if (!bVDev /* want everything in the vdev */ &&
+            mnSelectedRenderer >= 0)
+        {
+            aCtx.meStyle = RENDER_EXPANDED;
+            RegionRenderer * r = maRenderers[mnSelectedRenderer];
+            // profiling?
+            if (getIterCount() > 0)
+            {
+                double nStartTime = getTimeNow();
+                for (int i = 0; i < r->getTestRepeatCount(); i++)
+                    r->RenderRegion(rDev, aWholeWin, aCtx);
+                addTime(mnSelectedRenderer, getTimeNow() - nStartTime);
+            } else
+                r->RenderRegion(rDev, aWholeWin, aCtx);
+        }
+        else
+            drawThumbs(rDev, aWholeWin, bVDev);
     }
     std::vector<VclPtr<vcl::Window> > maInvalidates;
     void addInvalidate(vcl::Window *pWindow) { maInvalidates.push_back(pWindow); };
@@ -1399,6 +1426,7 @@ void DemoRenderer::InitRenderers()
     maRenderers.push_back(new DrawPolyPolygons());
     maRenderers.push_back(new DrawClipped());
     maRenderers.push_back(new DrawToVirtualDevice());
+    maRenderers.push_back(new DrawXOR());
     maRenderers.push_back(new DrawIcons());
     maRenderers.push_back(new FetchDrawBitmap());
 }