Use DrawingRecorder::canUseCachedDrawing

Source/core/paint/InlineTextBoxPainter.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/InlineTextBoxPainter.h"
 
 #include "core/dom/DocumentMarkerController.h"
 #include "core/dom/RenderedDocumentMarker.h"
 #include "core/editing/CompositionUnderline.h"
@@ skipping 56 matching lines @@
     // Determine whether or not we're selected.
     bool haveSelection = !isPrinting && paintInfo.phase != PaintPhaseTextClip && m_inlineTextBox.selectionState() != RenderObject::SelectionNone;
     if (!haveSelection && paintInfo.phase == PaintPhaseSelection) {
         // When only painting the selection, don't bother to paint if there is none.
         return;
     }
 
     // The text clip phase already has a DrawingRecorder. Text clips are initiated only in BoxPainter::paintLayerExtended, which is already
     // within a DrawingRecorder.
     OwnPtr<RenderDrawingRecorder> drawingRecorder;
-    if (RuntimeEnabledFeatures::slimmingPaintEnabled() && paintInfo.phase != PaintPhaseTextClip)
-        drawingRecorder = adoptPtr(new RenderDrawingRecorder(paintInfo.context, &m_inlineTextBox.renderer(), paintInfo.phase, pixelSnappedIntRect(adjustedPaintOffset, logicalVisualOverflow.size())));
+    if (RuntimeEnabledFeatures::slimmingPaintEnabled() && paintInfo.phase != PaintPhaseTextClip) {
+        drawingRecorder = adoptPtr(new RenderDrawingRecorder(paintInfo.context, m_inlineTextBox.renderer(), paintInfo.phase, pixelSnappedIntRect(adjustedPaintOffset, logicalVisualOverflow.size())));
+        if (drawingRecorder->canUseCachedDrawing())
+            return;
+    }
 
     if (m_inlineTextBox.truncation() != cNoTruncation) {
         if (m_inlineTextBox.renderer().containingBlock()->style()->isLeftToRightDirection() != m_inlineTextBox.isLeftToRightDirection()) {
             // Make the visible fragment of text hug the edge closest to the rest of the run by moving the origin
             // at which we start drawing text.
             // e.g. In the case of LTR text truncated in an RTL Context, the correct behavior is:
             // |Hello|CBA| -> |...He|CBA|
             // In order to draw the fragment "He" aligned to the right edge of it's box, we need to start drawing
             // farther to the right.
             // NOTE: WebKit's behavior differs from that of IE which appears to just overlay the ellipsis on top of the
@@ skipping 703 matching lines @@
             RenderTheme::theme().platformActiveTextSearchHighlightColor() :
             RenderTheme::theme().platformInactiveTextSearchHighlightColor();
         GraphicsContextStateSaver stateSaver(*pt);
         pt->clip(FloatRect(boxOrigin.x(), boxOrigin.y() - deltaY, m_inlineTextBox.logicalWidth(), selHeight));
         pt->drawHighlightForText(font, run, FloatPoint(boxOrigin.x(), boxOrigin.y() - deltaY), selHeight, color, sPos, ePos);
     }
 }
 
 
 } // namespace blink