[ozone,views-mus] Build CursorDataFactoryOzone.

ui/base/cursor/ozone/cursor_data_factory_ozone.h

+// Copyright 2017 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_BASE_CURSOR_OZONE_CURSORD_DATA_FACTORY_OZONE_H_
+#define UI_BASE_CURSOR_OZONE_CURSORD_DATA_FACTORY_OZONE_H_
+
+#include <map>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/base/cursor/cursor_data.h"
+#include "ui/base/ui_base_export.h"
+#include "ui/gfx/geometry/point.h"
+#include "ui/ozone/public/cursor_factory_ozone.h"
+
+namespace ui {
+
+// A refcounted wrapper around a ui::CursorData to obey CursorFactoryOzone's
+// refcounting interface while building ui::CursorData objects for transport
+// over mojo pipes.
+//
+// TODO(erg): In the long term, this should go away. When //content/ switches
+// from webcursor.h to use ui::CursorData directly, we should be able to get
+// rid of this class which is an adaptor for the existing ozone code.
+class UI_BASE_EXPORT CursorDataOzone
+    : public base::RefCounted<CursorDataOzone> {
+ public:
+  explicit CursorDataOzone(const ui::CursorData& data);
+
+  const ui::CursorData& data() const { return data_; }
+
+  // Instances of CursorDataOzone are passed around as void* because of the low
+  // level CursorFactoryOzone interface. Even worse, there can be multiple
+  // subclasses that map to this void* type. This asserts that a magic cookie
+  // that we put at the start of valid CursorDataOzone objects is correct.
+  void AssertIsACusrorDataOzone();
+
+ private:
+  friend class base::RefCounted<CursorDataOzone>;
+  ~CursorDataOzone();
+
+  // This is always a magic constant value. This is set in the constructor and
+  // unset in the destructor.
+  uint32_t magic_cookie_;
+
+  ui::CursorData data_;
+
+  DISALLOW_COPY_AND_ASSIGN(CursorDataOzone);
+};
+
+// CursorFactoryOzone implementation for processes which use ui::CursorDatas.
+//
+// Inside some sandboxed processes, we need to save all source data so it can
+// be processed in a remote process. This plugs into the current ozone cursor
+// creating code, and builds the cross platform mojo data structure.
+class UI_BASE_EXPORT CursorDataFactoryOzone : public CursorFactoryOzone {
+ public:
+  CursorDataFactoryOzone();
+  ~CursorDataFactoryOzone() override;
+
+  // Converts a PlatformCursor back to a ui::CursorData.
+  static const ui::CursorData& GetCursorData(PlatformCursor platform_cursor);
+
+  // CursorFactoryOzone:
+  PlatformCursor GetDefaultCursor(int type) override;
+  PlatformCursor CreateImageCursor(const SkBitmap& bitmap,
+                                   const gfx::Point& hotspot,
+                                   float bitmap_dpi) override;
+  PlatformCursor CreateAnimatedCursor(const std::vector<SkBitmap>& bitmaps,
+                                      const gfx::Point& hotspot,
+                                      int frame_delay_ms,
+                                      float bitmap_dpi) override;
+  void RefImageCursor(PlatformCursor cursor) override;
+  void UnrefImageCursor(PlatformCursor cursor) override;
+
+ private:
+  // Get cached BitmapCursorOzone for a default cursor.
+  scoped_refptr<CursorDataOzone> GetDefaultCursorInternal(int type);
+
+  // Default cursors are cached & owned by the factory.
+  typedef std::map<int, scoped_refptr<CursorDataOzone>> DefaultCursorMap;
+  DefaultCursorMap default_cursors_;
+
+  DISALLOW_COPY_AND_ASSIGN(CursorDataFactoryOzone);
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_CURSOR_OZONE_CURSORD_DATA_FACTORY_OZONE_H_