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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/lib/gpu/context.h"
#include <future>
#include "flutter/lib/gpu/formats.h"
#include "flutter/lib/ui/ui_dart_state.h"
#include "fml/make_copyable.h"
#include "tonic/converter/dart_converter.h"
namespace flutter {
namespace gpu {
IMPLEMENT_WRAPPERTYPEINFO(flutter_gpu, Context);
std::shared_ptr<impeller::Context> Context::default_context_;
void Context::SetOverrideContext(std::shared_ptr<impeller::Context> context) {
default_context_ = std::move(context);
}
std::shared_ptr<impeller::Context> Context::GetOverrideContext() {
return default_context_;
}
std::shared_ptr<impeller::Context> Context::GetDefaultContext(
std::optional<std::string>& out_error) {
auto override_context = GetOverrideContext();
if (override_context) {
return override_context;
}
auto dart_state = flutter::UIDartState::Current();
if (!dart_state->IsImpellerEnabled()) {
out_error =
"Flutter GPU requires the Impeller rendering backend to be enabled.";
return nullptr;
}
// Grab the Impeller context from the IO manager.
std::promise<std::shared_ptr<impeller::Context>> context_promise;
auto impeller_context_future = context_promise.get_future();
fml::TaskRunner::RunNowOrPostTask(
dart_state->GetTaskRunners().GetIOTaskRunner(),
fml::MakeCopyable([promise = std::move(context_promise),
io_manager = dart_state->GetIOManager()]() mutable {
promise.set_value(io_manager ? io_manager->GetImpellerContext()
: nullptr);
}));
auto context = impeller_context_future.get();
if (!context) {
out_error = "Unable to retrieve the Impeller context.";
}
return context;
}
Context::Context(std::shared_ptr<impeller::Context> context)
: context_(std::move(context)) {}
Context::~Context() = default;
std::shared_ptr<impeller::Context> Context::GetContext() {
return context_;
}
} // namespace gpu
} // namespace flutter
//----------------------------------------------------------------------------
/// Exports
///
Dart_Handle InternalFlutterGpu_Context_InitializeDefault(Dart_Handle wrapper) {
std::optional<std::string> out_error;
auto impeller_context = flutter::gpu::Context::GetDefaultContext(out_error);
if (out_error.has_value()) {
return tonic::ToDart(out_error.value());
}
auto res = fml::MakeRefCounted<flutter::gpu::Context>(impeller_context);
res->AssociateWithDartWrapper(wrapper);
return Dart_Null();
}
extern int InternalFlutterGpu_Context_GetDefaultColorFormat(
flutter::gpu::Context* wrapper) {
return static_cast<int>(flutter::gpu::FromImpellerPixelFormat(
wrapper->GetContext()->GetCapabilities()->GetDefaultColorFormat()));
}
extern int InternalFlutterGpu_Context_GetDefaultStencilFormat(
flutter::gpu::Context* wrapper) {
return static_cast<int>(flutter::gpu::FromImpellerPixelFormat(
wrapper->GetContext()->GetCapabilities()->GetDefaultStencilFormat()));
}
extern int InternalFlutterGpu_Context_GetDefaultDepthStencilFormat(
flutter::gpu::Context* wrapper) {
return static_cast<int>(flutter::gpu::FromImpellerPixelFormat(
wrapper->GetContext()
->GetCapabilities()
->GetDefaultDepthStencilFormat()));
}