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

third_party/WebKit/Source/platform/scroll/ScrollbarThemeMacNonOverlayAPI.mm

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "platform/scroll/ScrollbarThemeMacNonOverlayAPI.h"
 
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/ImageBuffer.h"
+#include "platform/graphics/paint/CullRect.h"
 #include "platform/graphics/paint/DrawingRecorder.h"
 #include "platform/mac/ThemeMac.h"
 #include "platform/scroll/ScrollbarThemeClient.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebRect.h"
 #include "public/platform/WebThemeEngine.h"
 #include "skia/ext/skia_utils_mac.h"
 #include <Carbon/Carbon.h>
 
 namespace blink {
@@ skipping 14 matching lines @@
 
 void ScrollbarThemeMacNonOverlayAPI::updateButtonPlacement(ScrollbarButtonsPlacement buttonPlacement)
 {
     gButtonPlacement = buttonPlacement;
 }
 
 // Override ScrollbarThemeMacCommon::paint() to add support for the following:
 //     - drawing using WebThemeEngine functions
 //     - drawing tickmarks
 //     - Skia specific changes
-bool ScrollbarThemeMacNonOverlayAPI::paint(const ScrollbarThemeClient* scrollbar, GraphicsContext* context, const IntRect& damageRect)
+bool ScrollbarThemeMacNonOverlayAPI::paint(const ScrollbarThemeClient* scrollbar, GraphicsContext* context, const CullRect& cullRect)
 {
     DisplayItem::Type displayItemType = scrollbar->orientation() == HorizontalScrollbar ? DisplayItem::ScrollbarHorizontal : DisplayItem::ScrollbarVertical;
     if (DrawingRecorder::useCachedDrawingIfPossible(*context, *scrollbar, displayItemType))
         return true;
 
     DrawingRecorder recorder(*context, *scrollbar, displayItemType, scrollbar->frameRect());
 
     // Get the tickmarks for the frameview.
     Vector<IntRect> tickmarks;
     scrollbar->getTickmarks(tickmarks);
@@ skipping 24 matching lines @@
     CGAffineTransform currentCTM = gfx::SkMatrixToCGAffineTransform(canvas->getTotalMatrix());
 
     // The Aqua scrollbar is buggy when rotated and scaled.  We will just draw into a bitmap if we detect a scale or rotation.
     bool canDrawDirectly = currentCTM.a == 1.0f && currentCTM.b == 0.0f && currentCTM.c == 0.0f && (currentCTM.d == 1.0f || currentCTM.d == -1.0f);
     OwnPtr<ImageBuffer> imageBuffer;
     SkCanvas* drawingCanvas;
     if (!canDrawDirectly) {
         trackInfo.bounds = IntRect(IntPoint(), scrollbar->frameRect().size());
 
         IntRect bufferRect(scrollbar->frameRect());
-        bufferRect.intersect(damageRect);
+        bufferRect.intersect(cullRect.m_rect);
         bufferRect.move(-scrollbar->frameRect().x(), -scrollbar->frameRect().y());
 
         imageBuffer = ImageBuffer::create(bufferRect.size());
         if (!imageBuffer)
             return true;
 
         drawingCanvas = imageBuffer->canvas();
     } else {
         drawingCanvas = canvas;
     }
@@ skipping 183 matching lines @@
         return IntRect(scrollbar->x() + startWidth, scrollbar->y(), scrollbar->width() - totalWidth, thickness);
     return IntRect(scrollbar->x(), scrollbar->y() + startWidth, thickness, scrollbar->height() - totalWidth);
 }
 
 int ScrollbarThemeMacNonOverlayAPI::minimumThumbLength(const ScrollbarThemeClient* scrollbar)
 {
     return cThumbMinLength[scrollbar->controlSize()];
 }
 
 }