dl_playground.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 "impeller/display_list/dl_playground.h"
 
#include "flutter/testing/testing.h"
#include "impeller/aiks/aiks_context.h"
#include "impeller/display_list/dl_dispatcher.h"
#include "impeller/typographer/backends/skia/typographer_context_skia.h"
#include "third_party/imgui/imgui.h"
#include "third_party/skia/include/core/SkData.h"
 
namespace impeller {
 
DlPlayground::DlPlayground() = default;
 
DlPlayground::~DlPlayground() = default;
 
bool DlPlayground::OpenPlaygroundHere(flutter::DisplayListBuilder& builder) {
  return OpenPlaygroundHere(builder.Build());
}
 
bool DlPlayground::OpenPlaygroundHere(sk_sp<flutter::DisplayList> list) {
  return OpenPlaygroundHere([&list]() { return list; });
}
 
bool DlPlayground::OpenPlaygroundHere(DisplayListPlaygroundCallback callback) {
  if (!switches_.enable_playground) {
    return true;
  }
 
  AiksContext context(GetContext(), TypographerContextSkia::Make());
  if (!context.IsValid()) {
    return false;
  }
  return Playground::OpenPlaygroundHere(
      [&context, &callback](RenderTarget& render_target) -> bool {
        static bool wireframe = false;
        if (ImGui::IsKeyPressed(ImGuiKey_Z)) {
          wireframe = !wireframe;
          context.GetContentContext().SetWireframe(wireframe);
        }
 
        auto list = callback();
 
        DlDispatcher dispatcher;
        list->Dispatch(dispatcher);
        auto picture = dispatcher.EndRecordingAsPicture();
 
        return context.Render(picture, render_target);
      });
}
 
static sk_sp<SkData> OpenFixtureAsSkData(const char* fixture_name) {
  auto mapping = flutter::testing::OpenFixtureAsMapping(fixture_name);
  if (!mapping) {
    return nullptr;
  }
  auto data = SkData::MakeWithProc(
      mapping->GetMapping(), mapping->GetSize(),
      [](const void* ptr, void* context) {
        delete reinterpret_cast<fml::Mapping*>(context);
      },
      mapping.get());
  mapping.release();
  return data;
}
 
SkFont DlPlayground::CreateTestFontOfSize(SkScalar scalar) {
  static constexpr const char* kTestFontFixture = "Roboto-Regular.ttf";
  auto mapping = OpenFixtureAsSkData(kTestFontFixture);
  FML_CHECK(mapping);
  return SkFont{SkTypeface::MakeFromData(mapping), scalar};
}
 
SkFont DlPlayground::CreateTestFont() {
  return CreateTestFontOfSize(50);
}
 
}  // namespace impeller