platform_view_layer.cc

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// Copyright 2013 The Flutter 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 "flutter/flow/layers/platform_view_layer.h"
 
#include "flutter/display_list/skia/dl_sk_canvas.h"
 
namespace flutter {
 
PlatformViewLayer::PlatformViewLayer(const DlPoint& offset,
                                     const DlSize& size,
                                     int64_t view_id)
    : offset_(offset), size_(size), view_id_(view_id) {}
 
void PlatformViewLayer::Preroll(PrerollContext* context) {
  set_paint_bounds(DlRect::MakeOriginSize(offset_, size_));
 
  if (context->view_embedder == nullptr) {
    FML_DLOG(ERROR) << "Trying to embed a platform view but the PrerollContext "
                       "does not support embedding";
    return;
  }
  context->has_platform_view = true;
  set_subtree_has_platform_view(true);
  MutatorsStack mutators;
  context->state_stack.fill(&mutators);
  std::unique_ptr<EmbeddedViewParams> params =
      std::make_unique<EmbeddedViewParams>(context->state_stack.matrix(), size_,
                                           mutators);
  context->view_embedder->PrerollCompositeEmbeddedView(view_id_,
                                                       std::move(params));
  context->view_embedder->PushVisitedPlatformView(view_id_);
}
 
void PlatformViewLayer::Paint(PaintContext& context) const {
  if (context.view_embedder == nullptr) {
    FML_DLOG(ERROR) << "Trying to embed a platform view but the PaintContext "
                       "does not support embedding";
    return;
  }
  DlCanvas* canvas = context.view_embedder->CompositeEmbeddedView(view_id_);
  context.canvas = canvas;
  context.state_stack.set_delegate(canvas);
  context.rendering_above_platform_view = true;
}
 
}  // namespace flutter