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

chromecast/public/osd_surface.h

Index: chromecast/public/osd_surface.h
diff --git a/chromecast/public/osd_surface.h b/chromecast/public/osd_surface.h
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index 0000000000000000000000000000000000000000..c83c06549937932695fbbf3e250428a365d36237
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+++ b/chromecast/public/osd_surface.h
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+// Copyright (c) 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.
+
+#ifndef CHROMECAST_PUBLIC_OSD_SURFACE_H_
+#define CHROMECAST_PUBLIC_OSD_SURFACE_H_
+
+namespace chromecast {
+
+struct Rect;
+struct Size;
+
+// Provides simple API (copy bitmap, blit, composite and fill) for drawing
+// OSD graphics on OsdPlane.  Hardware-specific implementation should be
+// instantiated by OsdPlane.
+class OsdSurface {
+ public:
+  struct Point {
+    Point(int arg_x, int arg_y) : x(arg_x), y(arg_y) {}
+
+    const int x;
+    const int y;
+  };
+
+  virtual ~OsdSurface() {}
+
+  // Blits(fast copy) bitmap from a surface. Copies |src_rect| area of surface
+  // |dst_point| of this surface.
+  virtual void Blit(OsdSurface* src_surface,
+                    const Rect& src_rect,
+                    const Point& dst_point) = 0;
+
+  // Composites ARGB values of |src_surface| on top of this surface. It is NOT
+  // copy. Used when displaying OSD images on same plane.
+  virtual void Composite(OsdSurface* src_surface,
+                         const Rect& src_rect,
+                         const Point& dst_point) = 0;
+
+  // Copies |damage_rect| area of src bitmap into |dst_point| of this surface.
+  // It is similar to Blit() except that it accepts arbitrary bitmap pointer
+  // instead of surface.
+  virtual void CopyBitmap(char* src_bitmap,
+                          const Rect& src_rect,
+                          const Rect& damage_rect,
+                          const Point& dst_point) = 0;
+
+  // Fills |rect| area of surface with |argb| value.
+  virtual void Fill(const Rect& rect, int argb) = 0;
+
+  // Returns the dimensions of the surface.
+  virtual const Size& size() const = 0;
+};
+
+}  // namespace chromecast
+
+#endif  // CHROMECAST_PUBLIC_OSD_SURFACE_H_