Implements core logic for Pixel Canvas

ui/views/view.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_VIEWS_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 
 #include <stddef.h>
 
 #include <algorithm>
@@ skipping 11 matching lines @@
 #include "ui/accessibility/ax_enums.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/base/class_property.h"
 #include "ui/base/dragdrop/drag_drop_types.h"
 #include "ui/base/dragdrop/drop_target_event.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/compositor/layer_delegate.h"
 #include "ui/compositor/layer_owner.h"
 #include "ui/compositor/paint_cache.h"
+#include "ui/compositor/paint_context.h"
 #include "ui/events/event.h"
 #include "ui/events/event_target.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/vector2d.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/path.h"
 #include "ui/views/view_targeter.h"
 #include "ui/views/views_export.h"
@@ skipping 1222 matching lines @@
   static int GetHorizontalDragThreshold();
   static int GetVerticalDragThreshold();
 
   // NativeTheme ---------------------------------------------------------------
 
   // Invoked when the NativeTheme associated with this View changes, including
   // when one first becomes available (after the view is added to a widget
   // hierarchy).
   virtual void OnNativeThemeChanged(const ui::NativeTheme* theme) {}
 
+  // Pixel Canvas --------------------------------------------------------------
+
+  // Returns the type of scaling to be done for this View. Values should be from
+  // ui::PaintContext::ScaleType.
+  virtual ui::PaintContext::ScaleType GetContextScaleType() const;
+
   // Debugging -----------------------------------------------------------------
 
 #if !defined(NDEBUG)
   // Returns string containing a graph of the views hierarchy in graphViz DOT
   // language (http://graphviz.org/). Can be called within debugger and save
   // to a file to compile/view.
   // Note: Assumes initial call made with first = true.
   virtual std::string PrintViewGraph(bool first);
 
   // Some classes may own an object which contains the children to displayed in
@@ skipping 28 matching lines @@
 
   // Schedules a paint on the parent View if it exists.
   void SchedulePaintOnParent();
 
   // Returns whether this view is eligible for painting, i.e. is visible and
   // nonempty.  Note that this does not behave like IsDrawn(), since it doesn't
   // check ancestors recursively; rather, it's used to prune subtrees of views
   // during painting.
   bool ShouldPaint() const;
 
-  // Returns the offset that should be used when constructing the paint context
+  // Returns the bounds that should be used when constructing the paint context
   // for this view.
-  gfx::Vector2d GetPaintContextOffset() const;
+  gfx::Rect GetPaintContextBounds() const;
 
   // Adjusts the transform of |recorder| in advance of painting.
-  void SetupTransformRecorderForPainting(ui::TransformRecorder* recorder) const;
+  void SetupTransformRecorderForPainting(
+      ui::TransformRecorder* recorder,
+      const gfx::Vector2d& offset_from_parent) const;
 
   // Recursively calls the painting method |func| on all non-layered children,
   // in Z order.
   void RecursivePaintHelper(void (View::*func)(const ui::PaintContext&),
                             const ui::PaintContext& context);
 
   // Invokes Paint() and, if necessary, PaintDebugRects().  Should be called
   // only on the root of a widget/layer.  PaintDebugRects() is invoked as a
   // separate pass, instead of being rolled into Paint(), so that siblings will
   // not obscure debug rects.
@@ skipping 374 matching lines @@
   // Observers -------------------------------------------------------------
 
   base::ObserverList<ViewObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_