// Copyright (c) 2012 The Chromium 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 "ui/snapshot/snapshot.h"

#include <memory>
#include <utility>

#include "base/bind.h"
#include "components/viz/common/frame_sinks/copy_output_request.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/android/view_android.h"
#include "ui/android/window_android.h"
#include "ui/android/window_android_compositor.h"
#include "ui/base/layout.h"
#include "ui/gfx/geometry/point_conversions.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/snapshot/snapshot_async.h"

namespace ui {

// Sync versions are not supported in Android.  Callers should fall back
// to the async version.
bool GrabViewSnapshot(gfx::NativeView view,
                      const gfx::Rect& snapshot_bounds,
                      gfx::Image* image) {
  return GrabWindowSnapshot(view->GetWindowAndroid(), snapshot_bounds, image);
}

bool GrabWindowSnapshot(gfx::NativeWindow window,
                        const gfx::Rect& snapshot_bounds,
                        gfx::Image* image) {
  return false;
}

static std::unique_ptr<viz::CopyOutputRequest> CreateCopyRequest(
    gfx::NativeView view,
    const gfx::Rect& source_rect,
    viz::CopyOutputRequest::CopyOutputRequestCallback callback) {
  std::unique_ptr<viz::CopyOutputRequest> request =
      std::make_unique<viz::CopyOutputRequest>(
          viz::CopyOutputRequest::ResultFormat::RGBA_BITMAP,
          std::move(callback));
  float scale = ui::GetScaleFactorForNativeView(view);
  request->set_area(gfx::ScaleToEnclosingRect(source_rect, scale));
  return request;
}

static void MakeAsyncCopyRequest(
    gfx::NativeWindow window,
    const gfx::Rect& source_rect,
    std::unique_ptr<viz::CopyOutputRequest> copy_request) {
  if (!window->GetCompositor())
    return;
  window->GetCompositor()->RequestCopyOfOutputOnRootLayer(
      std::move(copy_request));
}

void GrabWindowSnapshotAndScaleAsync(
    gfx::NativeWindow window,
    const gfx::Rect& source_rect,
    const gfx::Size& target_size,
    const GrabWindowSnapshotAsyncCallback& callback) {
  MakeAsyncCopyRequest(
      window, source_rect,
      CreateCopyRequest(window, source_rect,
                        base::BindOnce(&SnapshotAsync::ScaleCopyOutputResult,
                                       callback, target_size)));
}

void GrabWindowSnapshotAsync(gfx::NativeWindow window,
                             const gfx::Rect& source_rect,
                             const GrabWindowSnapshotAsyncCallback& callback) {
  MakeAsyncCopyRequest(
      window, source_rect,
      CreateCopyRequest(
          window, source_rect,
          base::BindOnce(&SnapshotAsync::RunCallbackWithCopyOutputResult,
                         callback)));
}

void GrabViewSnapshotAsync(gfx::NativeView view,
                           const gfx::Rect& source_rect,
                           const GrabWindowSnapshotAsyncCallback& callback) {
  std::unique_ptr<viz::CopyOutputRequest> copy_request =
      view->MaybeRequestCopyOfView(CreateCopyRequest(
          view, source_rect,
          base::BindOnce(&SnapshotAsync::RunCallbackWithCopyOutputResult,
                         callback)));
  if (!copy_request)
    return;

  MakeAsyncCopyRequest(view->GetWindowAndroid(), source_rect,
                       std::move(copy_request));
}

}  // namespace ui