surface_frame.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/surface_frame.h"
 
#include <limits>
#include <utility>
 
#include "flutter/fml/logging.h"
#include "flutter/fml/trace_event.h"
 
#include "third_party/skia/include/core/SkSurface.h"
#include "third_party/skia/include/utils/SkNWayCanvas.h"
 
namespace flutter {
 
SurfaceFrame::SurfaceFrame(sk_sp<SkSurface> surface,
                           FramebufferInfo framebuffer_info,
                           const SubmitCallback& submit_callback,
                           SkISize frame_size,
                           std::unique_ptr<GLContextResult> context_result,
                           bool display_list_fallback)
    : surface_(std::move(surface)),
      framebuffer_info_(framebuffer_info),
      submit_callback_(submit_callback),
      context_result_(std::move(context_result)) {
  FML_DCHECK(submit_callback_);
  if (surface_) {
    adapter_.set_canvas(surface_->getCanvas());
    canvas_ = &adapter_;
  } else if (display_list_fallback) {
    FML_DCHECK(!frame_size.isEmpty());
    // The root frame of a surface will be filled by the layer_tree which
    // performs branch culling so it will be unlikely to need an rtree for
    // further culling during `DisplayList::Dispatch`. Further, this canvas
    // will live underneath any platform views so we do not need to compute
    // exact coverage to describe "pixel ownership" to the platform.
    dl_builder_ = sk_make_sp<DisplayListBuilder>(SkRect::Make(frame_size),
                                                 /*prepare_rtree=*/false);
    canvas_ = dl_builder_.get();
  }
}
 
bool SurfaceFrame::Submit() {
  TRACE_EVENT0("flutter", "SurfaceFrame::Submit");
  if (submitted_) {
    return false;
  }
 
  submitted_ = PerformSubmit();
 
  return submitted_;
}
 
bool SurfaceFrame::IsSubmitted() const {
  return submitted_;
}
 
DlCanvas* SurfaceFrame::Canvas() {
  return canvas_;
}
 
sk_sp<SkSurface> SurfaceFrame::SkiaSurface() const {
  return surface_;
}
 
bool SurfaceFrame::PerformSubmit() {
  if (submit_callback_ == nullptr) {
    return false;
  }
 
  if (submit_callback_(*this, Canvas())) {
    return true;
  }
 
  return false;
}
 
sk_sp<DisplayList> SurfaceFrame::BuildDisplayList() {
  TRACE_EVENT0("impeller", "SurfaceFrame::BuildDisplayList");
  return dl_builder_ ? dl_builder_->Build() : nullptr;
}
 
}  // namespace flutter