surface.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/toolkit/interop/surface.h"
 
#include "impeller/base/validation.h"
#include "impeller/display_list/aiks_context.h"
#include "impeller/display_list/dl_dispatcher.h"
#include "impeller/renderer/backend/gles/surface_gles.h"
#include "impeller/toolkit/interop/formats.h"
 
namespace impeller::interop {
 
Surface::Surface(Context& context, std::shared_ptr<impeller::Surface> surface)
    : context_(Ref(&context)), surface_(std::move(surface)) {
  is_valid_ =
      context_ && context_->IsValid() && surface_ && surface_->IsValid();
}
 
Surface::~Surface() = default;
 
ScopedObject<Surface> Surface::WrapFBO(Context& context,
                                       uint64_t fbo,
                                       PixelFormat color_format,
                                       ISize size) {
  if (context.GetContext()->GetBackendType() !=
      impeller::Context::BackendType::kOpenGLES) {
    VALIDATION_LOG << "Context is not OpenGL ES based.";
    return nullptr;
  }
 
  auto impeller_surface = impeller::SurfaceGLES::WrapFBO(
      context.GetContext(), []() { return true; }, fbo, color_format, size);
  if (!impeller_surface || !impeller_surface->IsValid()) {
    VALIDATION_LOG << "Could not wrap FBO as a surface";
    return nullptr;
  }
 
  auto surface = Create<Surface>(context, std::move(impeller_surface));
  if (!surface->IsValid()) {
    VALIDATION_LOG << "Could not create valid surface.";
    return nullptr;
  }
  return surface;
}
 
bool Surface::IsValid() const {
  return is_valid_;
}
 
bool Surface::DrawDisplayList(const DisplayList& dl) const {
  if (!IsValid() || !dl.IsValid()) {
    return false;
  }
 
  auto display_list = dl.GetDisplayList();
  auto& content_context = context_->GetAiksContext().GetContentContext();
  auto render_target = surface_->GetRenderTarget();
 
  const auto cull_rect = IRect::MakeSize(surface_->GetSize());
  auto skia_cull_rect =
      SkIRect::MakeWH(cull_rect.GetWidth(), cull_rect.GetHeight());
 
  return RenderToOnscreen(content_context, render_target, display_list,
                          skia_cull_rect, /*reset_host_buffer=*/true);
}
 
}  // namespace impeller::interop