Adds public API and loads Cast OSD plane implementation from shared lib

chromecast/graphics/osd_plane_default.cc

+// Copyright 2015 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.
+
+#include "base/memory/scoped_ptr.h"
+#include "chromecast/public/graphics_types.h"
+#include "chromecast/public/osd_plane.h"
+#include "chromecast/public/osd_plane_shlib.h"
+#include "chromecast/public/osd_surface.h"
+
+namespace chromecast {
+namespace {
+
+// Default no-op OsdSurface implementation
+class OsdSurfaceDefault : public OsdSurface {
+ public:
+  OsdSurfaceDefault(const Size& size) : size_(size) {}
+
+  // OsdSurface implementation:
+  void Blit(OsdSurface* src_surface,
+            const Rect& src_rect,
+            const Point& dst_point) override {}
+  void Composite(OsdSurface* src_surface,
+                 const Rect& src_rect,
+                 const Point& dst_point) override {}
+  void CopyBitmap(char* src_bitmap,
+                  const Rect& src_rect,
+                  const Rect& damage_rect,
+                  const Point& dst_point) override {}
+  void Fill(const Rect& rect, int argb) override {}
+
+  const Size& size() const override { return size_; }
+
+ private:
+  const Size size_;
+
+  DISALLOW_COPY_AND_ASSIGN(OsdSurfaceDefault);
+};
+
+// Default no-op OsdPlane implementation
+class OsdPlaneDefault : public OsdPlane {
+ public:
+  OsdPlaneDefault() : size_(0, 0) {}
+
+  // OsdPlane implementation:
+  OsdSurface* CreateSurface(const Size& size) override {
+    return new OsdSurfaceDefault(size);
+  }
+  void SetClipRectangle(const Rect& rect) override {
+    size_ = Size(rect.width, rect.height);
+  }
+  OsdSurface* GetBackBuffer() override {
+    if (!back_buffer_)
+      back_buffer_.reset(new OsdSurfaceDefault(size_));
+    return back_buffer_.get();
+  }
+
+  void Flip() override {}
+
+ private:
+  scoped_ptr<OsdSurface> back_buffer_;
+  Size size_;
+
+  DISALLOW_COPY_AND_ASSIGN(OsdPlaneDefault);
+};
+
+}  // namespace
+
+OsdPlane* OsdPlaneShlib::Create(const std::vector<std::string>& argv) {
+  return new OsdPlaneDefault;
+}
+
+}  // namespace chromecast