Implement a paint offset cache for slimming paint v2

Source/core/paint/InlinePainter.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/InlinePainter.h"
 
 #include "core/layout/LayoutBlock.h"
 #include "core/layout/LayoutInline.h"
 #include "core/layout/LayoutTheme.h"
@@ skipping 35 matching lines @@
 
 void InlinePainter::paintOutline(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     const ComputedStyle& styleToUse = m_layoutInline.styleRef();
     if (!styleToUse.hasOutline())
         return;
 
     if (styleToUse.outlineStyleIsAuto()) {
         if (!LayoutTheme::theme().shouldDrawDefaultFocusRing(&m_layoutInline))
             return;
-        if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*paintInfo.context, m_layoutInline, paintInfo.phase))
+        if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*paintInfo.context, m_layoutInline, paintInfo.phase, paintOffset))
             return;
 
         Vector<LayoutRect> focusRingRects;
         m_layoutInline.addOutlineRects(focusRingRects, paintOffset);
 
-        LayoutObjectDrawingRecorder recorder(*paintInfo.context, m_layoutInline, paintInfo.phase, outlinePaintRect(focusRingRects, LayoutPoint()));
+        LayoutObjectDrawingRecorder recorder(*paintInfo.context, m_layoutInline, paintInfo.phase, outlinePaintRect(focusRingRects, LayoutPoint()), paintOffset);
         // Only paint the focus ring by hand if the theme isn't able to draw the focus ring.
         ObjectPainter(m_layoutInline).paintFocusRing(paintInfo, styleToUse, focusRingRects);
         return;
     }
 
     if (styleToUse.outlineStyle() == BNONE)
         return;
 
     GraphicsContext* graphicsContext = paintInfo.context;
-    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*graphicsContext, m_layoutInline, paintInfo.phase))
+    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*graphicsContext, m_layoutInline, paintInfo.phase, paintOffset))
         return;
 
     Vector<LayoutRect> rects;
 
     rects.append(LayoutRect());
     for (InlineFlowBox* curr = m_layoutInline.firstLineBox(); curr; curr = curr->nextLineBox()) {
         RootInlineBox& root = curr->root();
         LayoutUnit top = std::max<LayoutUnit>(root.lineTop(), curr->logicalTop());
         LayoutUnit bottom = std::min<LayoutUnit>(root.lineBottom(), curr->logicalBottom());
         rects.append(LayoutRect(curr->x(), top, curr->logicalWidth(), bottom - top));
     }
     rects.append(LayoutRect());
 
     Color outlineColor = m_layoutInline.resolveColor(styleToUse, CSSPropertyOutlineColor);
     bool useTransparencyLayer = outlineColor.hasAlpha();
 
-    LayoutObjectDrawingRecorder recorder(*graphicsContext, m_layoutInline, paintInfo.phase, outlinePaintRect(rects, paintOffset));
+    LayoutObjectDrawingRecorder recorder(*graphicsContext, m_layoutInline, paintInfo.phase, outlinePaintRect(rects, paintOffset), paintOffset);
     if (useTransparencyLayer) {
         graphicsContext->beginLayer(static_cast<float>(outlineColor.alpha()) / 255);
         outlineColor = Color(outlineColor.red(), outlineColor.green(), outlineColor.blue());
     }
 
     for (unsigned i = 1; i < rects.size() - 1; i++)
         paintOutlineForLine(graphicsContext, paintOffset, rects.at(i - 1), rects.at(i), rects.at(i + 1), outlineColor);
 
     if (useTransparencyLayer)
         graphicsContext->endLayer();
@@ skipping 116 matching lines @@
             pixelSnappedBox.maxX() + outlineWidth,
             pixelSnappedBox.maxY() + outlineWidth,
             BSBottom, outlineColor, outlineStyle,
             outlineWidth,
             outlineWidth,
             false);
     }
 }
 
 } // namespace blink