(WIP) Invalidation during painting (for synchronized painting)

third_party/WebKit/Source/core/paint/PartPainter.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 "core/paint/PartPainter.h"
 
 #include "core/layout/LayoutPart.h"
 #include "core/paint/BoxPainter.h"
 #include "core/paint/LayoutObjectDrawingRecorder.h"
 #include "core/paint/PaintInfo.h"
@@ skipping 24 matching lines @@
         return selectionEnd == end;
     if (s == SelectionBoth)
         return selectionStart == 0 && selectionEnd == end;
 
     ASSERT(0);
     return false;
 }
 
 void PartPainter::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
-    LayoutPoint adjustedPaintOffset = paintOffset + m_layoutPart.location();
-    if (!ReplacedPainter(m_layoutPart).shouldPaint(paintInfo, adjustedPaintOffset))
+    if (!ReplacedPainter(m_layoutPart).shouldPaint(paintInfo, paintOffset))
         return;
 
+    LayoutPoint adjustedPaintOffset = paintOffset + m_layoutPart.location();
     LayoutRect borderRect(adjustedPaintOffset, m_layoutPart.size());
 
     if (m_layoutPart.hasBoxDecorationBackground() && (paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection))
         BoxPainter(m_layoutPart).paintBoxDecorationBackground(paintInfo, adjustedPaintOffset);
 
     if (paintInfo.phase == PaintPhaseMask) {
         BoxPainter(m_layoutPart).paintMask(paintInfo, adjustedPaintOffset);
         return;
     }
 
@@ skipping 17 matching lines @@
                     -(m_layoutPart.paddingLeft() + m_layoutPart.borderLeft())),
                 true, true);
             clipper.emplace(m_layoutPart, paintInfo, borderRect, roundedInnerRect, ApplyToDisplayList);
         }
 
         if (m_layoutPart.widget())
             m_layoutPart.paintContents(paintInfo, paintOffset);
     }
 
     // Paint a partially transparent wash over selected widgets.
-    if (isSelected() && !paintInfo.isPrinting() && !LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintInfo.context, m_layoutPart, paintInfo.phase, adjustedPaintOffset)) {
+    if (isSelected() && !paintInfo.isPrinting() && !LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintInfo.context, m_layoutPart, paintInfo.phase)) {
         LayoutRect rect = m_layoutPart.localSelectionRect();
         rect.moveBy(adjustedPaintOffset);
         IntRect selectionRect = pixelSnappedIntRect(rect);
-        LayoutObjectDrawingRecorder drawingRecorder(paintInfo.context, m_layoutPart, paintInfo.phase, selectionRect, adjustedPaintOffset);
+        LayoutObjectDrawingRecorder drawingRecorder(paintInfo.context, m_layoutPart, paintInfo.phase, selectionRect);
         paintInfo.context.fillRect(selectionRect, m_layoutPart.selectionBackgroundColor());
     }
 
     if (m_layoutPart.canResize())
         ScrollableAreaPainter(*m_layoutPart.layer()->scrollableArea()).paintResizer(paintInfo.context, roundedIntPoint(adjustedPaintOffset), paintInfo.cullRect());
 }
 
 void PartPainter::paintContents(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     LayoutPoint adjustedPaintOffset = paintOffset + m_layoutPart.location();
@@ skipping 11 matching lines @@
     // When painting widgets into compositing layers, tx and ty are relative to the enclosing compositing layer,
     // not the root. In this case, shift the CTM and adjust the CullRect to be root-relative to fix plugin drawing.
     TransformRecorder transform(paintInfo.context, m_layoutPart,
         AffineTransform::translation(widgetPaintOffset.width(), widgetPaintOffset.height()));
 
     CullRect adjustedCullRect(paintInfo.cullRect(), -widgetPaintOffset);
     widget->paint(paintInfo.context, adjustedCullRect);
 }
 
 } // namespace blink