Use DrawingRecorder::canUseCachedDrawing

Source/core/paint/EllipsisBoxPainter.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/EllipsisBoxPainter.h"
 
 #include "core/paint/RenderDrawingRecorder.h"
 #include "core/paint/TextPainter.h"
 #include "core/rendering/EllipsisBox.h"
 #include "core/rendering/PaintInfo.h"
 #include "core/rendering/RootInlineBox.h"
 #include "core/rendering/TextRunConstructor.h"
 #include "platform/graphics/GraphicsContextStateSaver.h"
 
 namespace blink {
 
 void EllipsisBoxPainter::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
 {
     RenderStyle* style = m_ellipsisBox.renderer().style(m_ellipsisBox.isFirstLineStyle());
     paintEllipsis(paintInfo, paintOffset, lineTop, lineBottom, style);
     paintMarkupBox(paintInfo, paintOffset, lineTop, lineBottom, style);
 }
 
 void EllipsisBoxPainter::paintEllipsis(const PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom, RenderStyle* style)
 {
     GraphicsContext* context = paintInfo.context;
-    const Font& font = style->font();
     FloatPoint boxOrigin = m_ellipsisBox.locationIncludingFlipping();
     boxOrigin.moveBy(FloatPoint(paintOffset));
     if (!m_ellipsisBox.isHorizontal())
         boxOrigin.move(0, -m_ellipsisBox.virtualLogicalHeight());
     FloatRect boxRect(boxOrigin, FloatSize(m_ellipsisBox.logicalWidth(), m_ellipsisBox.virtualLogicalHeight()));
 
-    RenderDrawingRecorder recorder(paintInfo.context, &m_ellipsisBox.renderer(), paintInfo.phase, boxRect);
+    RenderDrawingRecorder recorder(context, m_ellipsisBox.renderer(), paintInfo.phase, boxRect);
+    if (recorder.canUseCachedDrawing())
+        return;
 
     GraphicsContextStateSaver stateSaver(*context);
     if (!m_ellipsisBox.isHorizontal())
         context->concatCTM(TextPainter::rotation(boxRect, TextPainter::Clockwise));
+    const Font& font = style->font();
     FloatPoint textOrigin(boxOrigin.x(), boxOrigin.y() + font.fontMetrics().ascent());
 
     bool isPrinting = m_ellipsisBox.renderer().document().printing();
     bool haveSelection = !isPrinting && paintInfo.phase != PaintPhaseTextClip && m_ellipsisBox.selectionState() != RenderObject::SelectionNone;
 
     if (haveSelection)
         paintSelection(context, boxOrigin, style, font);
     else if (paintInfo.phase == PaintPhaseSelection)
         return;
 
@@ skipping 35 matching lines @@
     LayoutUnit top = m_ellipsisBox.root().selectionTop();
     LayoutUnit h = m_ellipsisBox.root().selectionHeight();
     const int deltaY = roundToInt(m_ellipsisBox.renderer().style()->isFlippedLinesWritingMode() ? selectionBottom - m_ellipsisBox.logicalBottom() : m_ellipsisBox.logicalTop() - top);
     const FloatPoint localOrigin(boxOrigin.x(), boxOrigin.y() - deltaY);
     FloatRect clipRect(localOrigin, FloatSize(m_ellipsisBox.logicalWidth(), h.toFloat()));
     context->clip(clipRect);
     context->drawHighlightForText(font, constructTextRun(&m_ellipsisBox.renderer(), font, m_ellipsisBox.ellipsisStr(), style, TextRun::AllowTrailingExpansion), localOrigin, h, c);
 }
 
 } // namespace blink