Change Widget subclasses to use a CullRect instead of an IntRect for painting.

third_party/WebKit/Source/core/paint/FramePainter.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/FramePainter.h"
 
 #include "core/editing/markers/DocumentMarkerController.h"
 #include "core/fetch/MemoryCache.h"
 #include "core/frame/FrameView.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/InspectorTraceEvents.h"
 #include "core/layout/LayoutView.h"
 #include "core/page/Page.h"
 #include "core/paint/LayoutObjectDrawingRecorder.h"
 #include "core/paint/PaintInfo.h"
 #include "core/paint/PaintLayer.h"
 #include "core/paint/PaintLayerPainter.h"
 #include "core/paint/ScrollbarPainter.h"
 #include "core/paint/TransformRecorder.h"
 #include "platform/fonts/FontCache.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/paint/ClipRecorder.h"
 #include "platform/scroll/ScrollbarTheme.h"
 
 namespace blink {
 
 bool FramePainter::s_inPaintContents = false;
 
-void FramePainter::paint(GraphicsContext* context, const GlobalPaintFlags globalPaintFlags, const IntRect& rect)
+void FramePainter::paint(GraphicsContext* context, const GlobalPaintFlags globalPaintFlags, const CullRect& rect)
 {
     frameView().notifyPageThatContentAreaWillPaint();
 
-    IntRect documentDirtyRect = rect;
+    IntRect documentDirtyRect = rect.m_rect;
     IntRect visibleAreaWithoutScrollbars(frameView().location(), frameView().visibleContentRect().size());
     documentDirtyRect.intersect(visibleAreaWithoutScrollbars);
 
     if (!documentDirtyRect.isEmpty()) {
         TransformRecorder transformRecorder(*context, *frameView().layoutView(),
             AffineTransform::translation(frameView().x() - frameView().scrollX(), frameView().y() - frameView().scrollY()));
 
         ClipRecorder recorder(*context, *frameView().layoutView(), DisplayItem::ClipFrameToVisibleContentRect, LayoutRect(frameView().visibleContentRect()));
 
         documentDirtyRect.moveBy(-frameView().location() + frameView().scrollPosition());
         paintContents(context, globalPaintFlags, documentDirtyRect);
     }
 
     // Now paint the scrollbars.
     if (!frameView().scrollbarsSuppressed() && (frameView().horizontalScrollbar() || frameView().verticalScrollbar())) {
-        IntRect scrollViewDirtyRect = rect;
+        IntRect scrollViewDirtyRect = rect.m_rect;
         IntRect visibleAreaWithScrollbars(frameView().location(), frameView().visibleContentRect(IncludeScrollbars).size());
         scrollViewDirtyRect.intersect(visibleAreaWithScrollbars);
         scrollViewDirtyRect.moveBy(-frameView().location());
 
         TransformRecorder transformRecorder(*context, *frameView().layoutView(),
             AffineTransform::translation(frameView().x(), frameView().y()));
 
         ClipRecorder recorder(*context, *frameView().layoutView(), DisplayItem::ClipFrameScrollbars, LayoutRect(IntPoint(), visibleAreaWithScrollbars.size()));
 
         paintScrollbars(context, scrollViewDirtyRect);
@@ skipping 116 matching lines @@
 
 void FramePainter::paintScrollbar(GraphicsContext* context, Scrollbar* bar, const IntRect& rect)
 {
     bool needsBackground = bar->isCustomScrollbar() && frameView().frame().isMainFrame();
     if (needsBackground) {
         IntRect toFill = bar->frameRect();
         toFill.intersect(rect);
         context->fillRect(toFill, frameView().baseBackgroundColor());
     }
 
-    bar->paint(context, rect);
+    bar->paint(context, CullRect(rect));
 }
 
 const FrameView& FramePainter::frameView()
 {
     ASSERT(m_frameView);
     return *m_frameView;
 }
 
 } // namespace blink