Making GraphicsContext the owner of PlatformContext.

Source/WebKit/chromium/src/WebScrollbarThemePainter.cpp

 /*
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 30 matching lines @@
     // This is a pointer to a static object, so no ownership transferral.
     m_theme = painter.m_theme;
     m_scrollbar = painter.m_scrollbar;
 }
 
 void WebScrollbarThemePainter::paintScrollbarBackground(WebCanvas* canvas, const WebRect& rect)
 {
     SkRect clip = SkRect::MakeXYWH(rect.x, rect.y, rect.width, rect.height);
     canvas->clipRect(clip);
 
-    PlatformContextSkia platformContext(canvas);
-    platformContext.setDrawingToImageBuffer(true);
-    GraphicsContext context(&platformContext);
+    GraphicsContext context(canvas);
+    context.platformContext()->setDrawingToImageBuffer(true);
     m_theme->paintScrollbarBackground(&context, m_scrollbar);
 }
 
 void WebScrollbarThemePainter::paintTrackBackground(WebCanvas* canvas, const WebRect& rect)
 {
-    PlatformContextSkia platformContext(canvas);
-    platformContext.setDrawingToImageBuffer(true);
-    GraphicsContext context(&platformContext);
+    GraphicsContext context(canvas);
+    context.platformContext()->setDrawingToImageBuffer(true);
     m_theme->paintTrackBackground(&context, m_scrollbar, IntRect(rect));
 }
 
 void WebScrollbarThemePainter::paintBackTrackPart(WebCanvas* canvas, const WebRect& rect)
 {
-    PlatformContextSkia platformContext(canvas);
-    platformContext.setDrawingToImageBuffer(true);
-    GraphicsContext context(&platformContext);
+    GraphicsContext context(canvas);
+    context.platformContext()->setDrawingToImageBuffer(true);
     m_theme->paintTrackPiece(&context, m_scrollbar, IntRect(rect), WebCore::BackTrackPart);
 }
 
 void WebScrollbarThemePainter::paintForwardTrackPart(WebCanvas* canvas, const WebRect& rect)
 {
-    PlatformContextSkia platformContext(canvas);
-    platformContext.setDrawingToImageBuffer(true);
-    GraphicsContext context(&platformContext);
+    GraphicsContext context(canvas);
+    context.platformContext()->setDrawingToImageBuffer(true);
     m_theme->paintTrackPiece(&context, m_scrollbar, IntRect(rect), WebCore::ForwardTrackPart);
 }
 
 void WebScrollbarThemePainter::paintBackButtonStart(WebCanvas* canvas, const WebRect& rect)
 {
-    PlatformContextSkia platformContext(canvas);
-    platformContext.setDrawingToImageBuffer(true);
-    GraphicsContext context(&platformContext);
+    GraphicsContext context(canvas);
+    context.platformContext()->setDrawingToImageBuffer(true);
     m_theme->paintButton(&context, m_scrollbar, IntRect(rect), WebCore::BackButtonStartPart);
 }
 
 void WebScrollbarThemePainter::paintBackButtonEnd(WebCanvas* canvas, const WebRect& rect)
 {
-    PlatformContextSkia platformContext(canvas);
-    platformContext.setDrawingToImageBuffer(true);
-    GraphicsContext context(&platformContext);
+    GraphicsContext context(canvas);
+    context.platformContext()->setDrawingToImageBuffer(true);
     m_theme->paintButton(&context, m_scrollbar, IntRect(rect), WebCore::BackButtonEndPart);
 }
 
 void WebScrollbarThemePainter::paintForwardButtonStart(WebCanvas* canvas, const WebRect& rect)
 {
-    PlatformContextSkia platformContext(canvas);
-    platformContext.setDrawingToImageBuffer(true);
-    GraphicsContext context(&platformContext);
+    GraphicsContext context(canvas);
+    context.platformContext()->setDrawingToImageBuffer(true);
     m_theme->paintButton(&context, m_scrollbar, IntRect(rect), WebCore::ForwardButtonStartPart);
 }
 
 void WebScrollbarThemePainter::paintForwardButtonEnd(WebCanvas* canvas, const WebRect& rect)
 {
-    PlatformContextSkia platformContext(canvas);
-    platformContext.setDrawingToImageBuffer(true);
-    GraphicsContext context(&platformContext);
+    GraphicsContext context(canvas);
+    context.platformContext()->setDrawingToImageBuffer(true);
     m_theme->paintButton(&context, m_scrollbar, IntRect(rect), WebCore::ForwardButtonEndPart);
 }
 
 void WebScrollbarThemePainter::paintTickmarks(WebCanvas* canvas, const WebRect& rect)
 {
-    PlatformContextSkia platformContext(canvas);
-    platformContext.setDrawingToImageBuffer(true);
-    GraphicsContext context(&platformContext);
+    GraphicsContext context(canvas);
+    context.platformContext()->setDrawingToImageBuffer(true);
     m_theme->paintTickmarks(&context, m_scrollbar, IntRect(rect));
 }
 
 void WebScrollbarThemePainter::paintThumb(WebCanvas* canvas, const WebRect& rect)
 {
-    PlatformContextSkia platformContext(canvas);
-    platformContext.setDrawingToImageBuffer(true);
-    GraphicsContext context(&platformContext);
+    GraphicsContext context(canvas);
+    context.platformContext()->setDrawingToImageBuffer(true);
     m_theme->paintThumb(&context, m_scrollbar, IntRect(rect));
 }
 
 WebScrollbarThemePainter::WebScrollbarThemePainter(WebCore::ScrollbarThemeComposite* theme, WebCore::Scrollbar* scrollbar)
     : m_theme(theme)
     , m_scrollbar(scrollbar)
 {
 }
 
 } // namespace WebKit