Back PaintRecord with PaintOpBuffer instead of SkPicture

third_party/WebKit/Source/platform/exported/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 16 matching lines @@
 
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/paint/PaintCanvas.h"
 #include "platform/graphics/paint/PaintRecordBuilder.h"
 #include "platform/scroll/Scrollbar.h"
 #include "platform/scroll/ScrollbarTheme.h"
 #include "public/platform/WebRect.h"
 
 namespace blink {
 
+// WebScrollbarThemeMac uses GraphicsContextCanvas which doesn't quite support
+// device clip rects not at the origin.  This class translates the recording
+// canvas to the origin and then adjusts it back during playback.
+class ScopedScrollbarPainter {
+ public:
+  ScopedScrollbarPainter(WebScrollbarThemePainter* painter,
+                         WebCanvas* canvas,
+                         const WebRect& rect)
+      : m_intRect(IntRect(IntPoint(), IntSize(rect.width, rect.height))),
+        m_builder(m_intRect),
+        m_canvas(canvas),
+        m_rect(rect) {
+    m_builder.context().setDeviceScaleFactor(painter->deviceScaleFactor());
+  }
+  GraphicsContext& context() { return m_builder.context(); }
+  const IntRect& rect() const { return m_intRect; }
+
+  ~ScopedScrollbarPainter() {
+    m_canvas->save();
+    m_canvas->translate(m_rect.x, m_rect.y);
+    m_canvas->PlaybackPaintRecord(m_builder.endRecording());
+    m_canvas->restore();
+  }
+
+ protected:
+  IntRect m_intRect;
+  PaintRecordBuilder m_builder;
+  WebCanvas* m_canvas;
+  const WebRect& m_rect;
+};
+
 void WebScrollbarThemePainter::assign(const WebScrollbarThemePainter& painter) {
   // This is a pointer to a static object, so no ownership transferral.
   m_theme = painter.m_theme;
   m_scrollbar = painter.m_scrollbar;
   m_deviceScaleFactor = painter.m_deviceScaleFactor;
 }
 
 void WebScrollbarThemePainter::reset() {
   m_scrollbar = nullptr;
 }
 
 void WebScrollbarThemePainter::paintScrollbarBackground(WebCanvas* canvas,
                                                         const WebRect& rect) {
   SkRect clip = SkRect::MakeXYWH(rect.x, rect.y, rect.width, rect.height);
   canvas->clipRect(clip);
 
-  IntRect intRect(rect);
-  PaintRecordBuilder builder(intRect);
-  builder.context().setDeviceScaleFactor(m_deviceScaleFactor);
-  m_theme->paintScrollbarBackground(builder.context(), *m_scrollbar);
-  canvas->PlaybackPaintRecord(builder.endRecording());
+  ScopedScrollbarPainter painter(this, canvas, rect);
+  m_theme->paintScrollbarBackground(painter.context(), *m_scrollbar);
 }
 
 void WebScrollbarThemePainter::paintTrackBackground(WebCanvas* canvas,
                                                     const WebRect& rect) {
-  IntRect intRect(rect);
-  PaintRecordBuilder builder(intRect);
-  builder.context().setDeviceScaleFactor(m_deviceScaleFactor);
-  m_theme->paintTrackBackground(builder.context(), *m_scrollbar, intRect);
-  canvas->PlaybackPaintRecord(builder.endRecording());
+  ScopedScrollbarPainter painter(this, canvas, rect);
+  m_theme->paintTrackBackground(painter.context(), *m_scrollbar,
+                                painter.rect());
   if (!m_theme->shouldRepaintAllPartsOnInvalidation())
     m_scrollbar->clearTrackNeedsRepaint();
 }
 
 void WebScrollbarThemePainter::paintBackTrackPart(WebCanvas* canvas,
                                                   const WebRect& rect) {
-  IntRect intRect(rect);
-  PaintRecordBuilder builder(intRect);
-  builder.context().setDeviceScaleFactor(m_deviceScaleFactor);
-  m_theme->paintTrackPiece(builder.context(), *m_scrollbar, intRect,
+  ScopedScrollbarPainter painter(this, canvas, rect);
+  m_theme->paintTrackPiece(painter.context(), *m_scrollbar, painter.rect(),
                            BackTrackPart);
-  canvas->PlaybackPaintRecord(builder.endRecording());
 }
 
 void WebScrollbarThemePainter::paintForwardTrackPart(WebCanvas* canvas,
                                                      const WebRect& rect) {
-  IntRect intRect(rect);
-  PaintRecordBuilder builder(intRect);
-  builder.context().setDeviceScaleFactor(m_deviceScaleFactor);
-  m_theme->paintTrackPiece(builder.context(), *m_scrollbar, intRect,
+  ScopedScrollbarPainter painter(this, canvas, rect);
+  m_theme->paintTrackPiece(painter.context(), *m_scrollbar, painter.rect(),
                            ForwardTrackPart);
-  canvas->PlaybackPaintRecord(builder.endRecording());
 }
 
 void WebScrollbarThemePainter::paintBackButtonStart(WebCanvas* canvas,
                                                     const WebRect& rect) {
-  IntRect intRect(rect);
-  PaintRecordBuilder builder(intRect);
-  builder.context().setDeviceScaleFactor(m_deviceScaleFactor);
-  m_theme->paintButton(builder.context(), *m_scrollbar, intRect,
+  ScopedScrollbarPainter painter(this, canvas, rect);
+  m_theme->paintButton(painter.context(), *m_scrollbar, painter.rect(),
                        BackButtonStartPart);
-  canvas->PlaybackPaintRecord(builder.endRecording());
 }
 
 void WebScrollbarThemePainter::paintBackButtonEnd(WebCanvas* canvas,
                                                   const WebRect& rect) {
-  IntRect intRect(rect);
-  PaintRecordBuilder builder(intRect);
-  builder.context().setDeviceScaleFactor(m_deviceScaleFactor);
-  m_theme->paintButton(builder.context(), *m_scrollbar, intRect,
+  ScopedScrollbarPainter painter(this, canvas, rect);
+  m_theme->paintButton(painter.context(), *m_scrollbar, painter.rect(),
                        BackButtonEndPart);
-  canvas->PlaybackPaintRecord(builder.endRecording());
 }
 
 void WebScrollbarThemePainter::paintForwardButtonStart(WebCanvas* canvas,
                                                        const WebRect& rect) {
-  IntRect intRect(rect);
-  PaintRecordBuilder builder(intRect);
-  builder.context().setDeviceScaleFactor(m_deviceScaleFactor);
-  m_theme->paintButton(builder.context(), *m_scrollbar, intRect,
+  ScopedScrollbarPainter painter(this, canvas, rect);
+  m_theme->paintButton(painter.context(), *m_scrollbar, painter.rect(),
                        ForwardButtonStartPart);
-  canvas->PlaybackPaintRecord(builder.endRecording());
 }
 
 void WebScrollbarThemePainter::paintForwardButtonEnd(WebCanvas* canvas,
                                                      const WebRect& rect) {
-  IntRect intRect(rect);
-  PaintRecordBuilder builder(intRect);
-  builder.context().setDeviceScaleFactor(m_deviceScaleFactor);
-  m_theme->paintButton(builder.context(), *m_scrollbar, intRect,
+  ScopedScrollbarPainter painter(this, canvas, rect);
+  m_theme->paintButton(painter.context(), *m_scrollbar, painter.rect(),
                        ForwardButtonEndPart);
-  canvas->PlaybackPaintRecord(builder.endRecording());
 }
 
 void WebScrollbarThemePainter::paintTickmarks(WebCanvas* canvas,
                                               const WebRect& rect) {
-  IntRect intRect(rect);
-  PaintRecordBuilder builder(intRect);
-  builder.context().setDeviceScaleFactor(m_deviceScaleFactor);
-  m_theme->paintTickmarks(builder.context(), *m_scrollbar, intRect);
-  canvas->PlaybackPaintRecord(builder.endRecording());
+  ScopedScrollbarPainter painter(this, canvas, rect);
+  m_theme->paintTickmarks(painter.context(), *m_scrollbar, painter.rect());
 }
 
 void WebScrollbarThemePainter::paintThumb(WebCanvas* canvas,
                                           const WebRect& rect) {
-  IntRect intRect(rect);
-  PaintRecordBuilder builder(intRect);
-  builder.context().setDeviceScaleFactor(m_deviceScaleFactor);
-  m_theme->paintThumb(builder.context(), *m_scrollbar, intRect);
-  canvas->PlaybackPaintRecord(builder.endRecording());
+  ScopedScrollbarPainter painter(this, canvas, rect);
+  m_theme->paintThumb(painter.context(), *m_scrollbar, painter.rect());
   if (!m_theme->shouldRepaintAllPartsOnInvalidation())
     m_scrollbar->clearThumbNeedsRepaint();
 }
 
 WebScrollbarThemePainter::WebScrollbarThemePainter(ScrollbarTheme& theme,
                                                    Scrollbar& scrollbar,
                                                    float deviceScaleFactor)
     : m_theme(&theme),
       m_scrollbar(&scrollbar),
       m_deviceScaleFactor(deviceScaleFactor) {}
 
 float WebScrollbarThemePainter::thumbOpacity() const {
   return m_theme->thumbOpacity(*m_scrollbar);
 }
 
 bool WebScrollbarThemePainter::trackNeedsRepaint() const {
   return m_scrollbar->trackNeedsRepaint();
 }
 
 bool WebScrollbarThemePainter::thumbNeedsRepaint() const {
   return m_scrollbar->thumbNeedsRepaint();
 }
 
 bool WebScrollbarThemePainter::usesNinePatchThumbResource() const {
   return m_theme->usesNinePatchThumbResource();
 }
 
 }  // namespace blink