Teach the native viewport service to draw a Surface into itself

mojo/services/native_viewport/viewport_surface.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/services/native_viewport/viewport_surface.h"
+
+#include "base/bind.h"
+#include "cc/surfaces/surface_id_allocator.h"
+#include "mojo/services/public/cpp/geometry/geometry_type_converters.h"
+#include "mojo/services/public/cpp/surfaces/surfaces_type_converters.h"
+#include "ui/gfx/transform.h"
+
+namespace mojo {
+
+ViewportSurface::ViewportSurface(SurfacesService* surfaces_service,
+                                 Gpu* gpu_service,
+                                 const gfx::Rect& bounds,
+                                 cc::SurfaceId child_id)
+    : gpu_service_(gpu_service),
+      widget_id_(0u),
+      bounds_(bounds),
+      child_id_(child_id),
+      weak_factory_(this) {
+  surfaces_service->CreateSurfaceConnection(
+      base::Bind(&ViewportSurface::OnSurfaceConnectionCreated,
+                 weak_factory_.GetWeakPtr()));
+}
+
+ViewportSurface::~ViewportSurface() {
+}
+
+void ViewportSurface::SetWidgetId(uint64_t widget_id) {
+  widget_id_ = widget_id;
+  if (id_allocator_)
+    BindSurfaceToNativeViewport();
+}
+
+void ViewportSurface::SetBounds(const gfx::Rect& bounds) {
+  if (bounds_ == bounds)
+    return;
+
+  if (id_.is_null())
+    return;
+
+  surface_->DestroySurface(SurfaceId::From(id_));
+  BindSurfaceToNativeViewport();
+}
+
+void ViewportSurface::SetChildId(cc::SurfaceId child_id) {
+  child_id_ = child_id;
+  SubmitFrame();
+}
+
+void ViewportSurface::OnSurfaceConnectionCreated(SurfacePtr surface,
+                                                 uint32_t id_namespace) {
+  surface_ = surface.Pass();
+  id_allocator_.reset(new cc::SurfaceIdAllocator(id_namespace));
+  if (widget_id_ != 0u)
+    BindSurfaceToNativeViewport();
+}
+
+void ViewportSurface::BindSurfaceToNativeViewport() {
+  CommandBufferPtr cb;
+  gpu_service_->CreateOnscreenGLES2Context(
+      widget_id_, Size::From(bounds_.size()), Get(&cb));
+
+  id_ = id_allocator_->GenerateId();
+  surface_->CreateGLES2BoundSurface(
+      cb.Pass(), SurfaceId::From(id_), Size::From(bounds_.size()));
+
+  SubmitFrame();
+}
+
+void ViewportSurface::SubmitFrame() {
+  if (child_id_.is_null() || id_.is_null())
+    return;
+
+  SurfaceQuadStatePtr surface_quad_state = SurfaceQuadState::New();
+  surface_quad_state->surface = SurfaceId::From(child_id_);
+
+  QuadPtr surface_quad = Quad::New();
+  surface_quad->material = Material::MATERIAL_SURFACE_CONTENT;
+  surface_quad->rect = Rect::From(bounds_);
+  surface_quad->opaque_rect = Rect::From(bounds_);
+  surface_quad->visible_rect = Rect::From(bounds_);
+  surface_quad->needs_blending = true;
+  surface_quad->shared_quad_state_index = 0;
+  surface_quad->surface_quad_state = surface_quad_state.Pass();
+
+  SharedQuadStatePtr sqs = SharedQuadState::New();
+  sqs->content_to_target_transform = Transform::From(gfx::Transform());
+  sqs->content_bounds = Size::From(bounds_.size());
+  sqs->visible_content_rect = Rect::From(bounds_);
+  sqs->clip_rect = Rect::From(bounds_);
+  sqs->is_clipped = false;
+  sqs->opacity = 1.0f;
+  sqs->blend_mode = SkXfermode::SK_XFERMODE_kSrcOver_Mode;
+  sqs->sorting_context_id = 1;
+
+  PassPtr pass = Pass::New();
+  pass->id = 1;
+  pass->output_rect = Rect::From(bounds_);
+  pass->damage_rect = Rect::From(bounds_);
+  pass->transform_to_root_target = Transform::From(gfx::Transform());
+  pass->has_transparent_background = false;
+  pass->quads.push_back(surface_quad.Pass());
+  pass->shared_quad_states.push_back(sqs.Pass());
+
+  FramePtr frame = Frame::New();
+  frame->passes.push_back(pass.Pass());
+  frame->resources.resize(0u);
+  surface_->SubmitFrame(SurfaceId::From(id_), frame.Pass());
+}
+
+void ViewportSurface::ReturnResources(Array<ReturnedResourcePtr> resources) {
+  // We never submit resources so we should never get any back.
+  DCHECK_EQ(0u, resources.size());
+}
+
+}  // namespace mojo