Teach the native viewport service to draw a Surface into itself

mojo/examples/surfaces_app/embedder.cc

 // Copyright 2014 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 "mojo/examples/surfaces_app/embedder.h"
 
 #include "cc/output/compositor_frame.h"
 #include "cc/output/delegated_frame_data.h"
 #include "cc/quads/render_pass.h"
 #include "cc/quads/solid_color_draw_quad.h"
@@ skipping 25 matching lines @@
 void Embedder::ProduceFrame(cc::SurfaceId child_one,
                             cc::SurfaceId child_two,
                             const gfx::Size& child_size,
                             const gfx::Size& size,
                             int offset) {
   gfx::Rect rect(size);
   RenderPassId pass_id(1, 1);
   scoped_ptr<RenderPass> pass = RenderPass::Create();
   pass->SetNew(pass_id, rect, rect, gfx::Transform());
 
-  gfx::Transform one_transform;
-  one_transform.Translate(10 + child_size.width() / 2,
-                          50 + child_size.height() / 2);
-  one_transform.Translate(0, offset);
-  one_transform.Translate(-child_size.width() / 2, -child_size.height() / 2);
-  CreateAndAppendSimpleSharedQuadState(pass.get(), one_transform, size);
+  if (!child_one.is_null()) {
+    gfx::Transform one_transform;
+    one_transform.Translate(10 + child_size.width() / 2,
+                            50 + child_size.height() / 2);
+    one_transform.Translate(0, offset);
+    one_transform.Translate(-child_size.width() / 2, -child_size.height() / 2);
+    CreateAndAppendSimpleSharedQuadState(pass.get(), one_transform, size);
 
-  SurfaceDrawQuad* surface_one_quad =
-      pass->CreateAndAppendDrawQuad<SurfaceDrawQuad>();
-  gfx::Rect one_rect(child_size);
-  surface_one_quad->SetNew(
-      pass->shared_quad_state_list.back(), one_rect, one_rect, child_one);
+    SurfaceDrawQuad* surface_one_quad =
+        pass->CreateAndAppendDrawQuad<SurfaceDrawQuad>();
+    gfx::Rect one_rect(child_size);
+    surface_one_quad->SetNew(
+        pass->shared_quad_state_list.back(), one_rect, one_rect, child_one);
+  }
 
-  gfx::Transform two_transform;
-  two_transform.Translate(10 + size.width() / 2 + child_size.width() / 2,
-                          50 + child_size.height() / 2);
-  two_transform.Translate(0, 200 - offset);
-  two_transform.Translate(-child_size.width() / 2, -child_size.height() / 2);
-  CreateAndAppendSimpleSharedQuadState(pass.get(), two_transform, size);
+  if (!child_two.is_null()) {
+    gfx::Transform two_transform;
+    two_transform.Translate(10 + size.width() / 2 + child_size.width() / 2,
+                            50 + child_size.height() / 2);
+    two_transform.Translate(0, 200 - offset);
+    two_transform.Translate(-child_size.width() / 2, -child_size.height() / 2);
+    CreateAndAppendSimpleSharedQuadState(pass.get(), two_transform, size);
 
-  SurfaceDrawQuad* surface_two_quad =
-      pass->CreateAndAppendDrawQuad<SurfaceDrawQuad>();
-  gfx::Rect two_rect(child_size);
-  surface_two_quad->SetNew(
-      pass->shared_quad_state_list.back(), two_rect, two_rect, child_two);
+    SurfaceDrawQuad* surface_two_quad =
+        pass->CreateAndAppendDrawQuad<SurfaceDrawQuad>();
+    gfx::Rect two_rect(child_size);
+    surface_two_quad->SetNew(
+        pass->shared_quad_state_list.back(), two_rect, two_rect, child_two);
+  }
 
   CreateAndAppendSimpleSharedQuadState(pass.get(), gfx::Transform(), size);
   SolidColorDrawQuad* color_quad =
       pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
   bool force_anti_aliasing_off = false;
   color_quad->SetNew(pass->shared_quad_state_list.back(),
                      rect,
                      rect,
                      SK_ColorYELLOW,
                      force_anti_aliasing_off);
 
   scoped_ptr<DelegatedFrameData> delegated_frame_data(new DelegatedFrameData);
   delegated_frame_data->render_pass_list.push_back(pass.Pass());
 
   scoped_ptr<CompositorFrame> frame(new CompositorFrame);
   frame->delegated_frame_data = delegated_frame_data.Pass();
 
   surface_->SubmitFrame(mojo::SurfaceId::From(id_),
                         mojo::Frame::From(*frame));
 }
 
 }  // namespace examples
 }  // namespace mojo