examples/ui/noodles/rasterizer.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 "examples/ui/noodles/rasterizer.h"

#include "base/bind.h"
#include "base/logging.h"
#include "examples/ui/noodles/frame.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkSurface.h"

namespace examples {

constexpr uint32_t kContentImageResourceId = 1;
constexpr uint32_t kRootNodeId = mojo::gfx::composition::kSceneRootNodeId;

Rasterizer::Rasterizer(mojo::ApplicationConnectorPtr connector,
                       mojo::gfx::composition::ScenePtr scene)
    : gl_context_owner_(connector.get()),
      ganesh_context_(gl_context_owner_.context()),
      ganesh_renderer_(&ganesh_context_),
      scene_(scene.Pass()) {}

Rasterizer::~Rasterizer() {}

void Rasterizer::PublishFrame(std::unique_ptr<Frame> frame) {
  DCHECK(frame);

  mojo::Rect bounds;
  bounds.width = frame->size().width;
  bounds.height = frame->size().height;

  auto update = mojo::gfx::composition::SceneUpdate::New();
  mojo::gfx::composition::ResourcePtr content_resource =
      ganesh_renderer_.DrawCanvas(
          frame->size(),
          base::Bind(&Frame::Paint, base::Unretained(frame.get())));
  DCHECK(content_resource);
  update->resources.insert(kContentImageResourceId, content_resource.Pass());

  auto root_node = mojo::gfx::composition::Node::New();
  root_node->op = mojo::gfx::composition::NodeOp::New();
  root_node->op->set_image(mojo::gfx::composition::ImageNodeOp::New());
  root_node->op->get_image()->content_rect = bounds.Clone();
  root_node->op->get_image()->image_resource_id = kContentImageResourceId;
  update->nodes.insert(kRootNodeId, root_node.Pass());

  scene_->Update(update.Pass());
  scene_->Publish(frame->TakeSceneMetadata());
}

}  // namespace examples