// Copyright 2017 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 "cc/raster/playback_image_provider.h"

#include "cc/tiles/image_decode_cache.h"

namespace cc {
namespace {
void UnrefImageFromCache(DrawImage draw_image,
                         ImageDecodeCache* cache,
                         DecodedDrawImage decoded_draw_image) {
  cache->DrawWithImageFinished(draw_image, decoded_draw_image);
}

}  // namespace

PlaybackImageProvider::PlaybackImageProvider(
    ImageDecodeCache* cache,
    base::Optional<Settings>&& settings)
    : cache_(cache),
      settings_(std::move(settings)) {
  DCHECK(cache_);
}

PlaybackImageProvider::~PlaybackImageProvider() = default;

PlaybackImageProvider::PlaybackImageProvider(PlaybackImageProvider&& other) =
    default;

PlaybackImageProvider& PlaybackImageProvider::operator=(
    PlaybackImageProvider&& other) = default;

ImageProvider::ScopedDecodedDrawImage
PlaybackImageProvider::GetDecodedDrawImage(const DrawImage& draw_image) {
  // Return an empty decoded image if we are skipping all images during this
  // raster.
  if (!settings_.has_value())
    return ScopedDecodedDrawImage();

  const PaintImage& paint_image = draw_image.paint_image();
  if (settings_->images_to_skip.count(paint_image.stable_id()) != 0) {
    DCHECK(paint_image.GetSkImage()->isLazyGenerated());
    return ScopedDecodedDrawImage();
  }

  const auto& it =
      settings_->image_to_current_frame_index.find(paint_image.stable_id());
  size_t frame_index = it == settings_->image_to_current_frame_index.end()
                           ? PaintImage::kDefaultFrameIndex
                           : it->second;

  DrawImage adjusted_image(draw_image, 1.f, frame_index);
  if (!cache_->UseCacheForDrawImage(adjusted_image)) {
    return ScopedDecodedDrawImage(DecodedDrawImage(
        paint_image.GetSkImage(), SkSize::Make(0, 0), SkSize::Make(1.f, 1.f),
        draw_image.filter_quality(), true /* is_budgeted */));
  }

  auto decoded_draw_image = cache_->GetDecodedImageForDraw(adjusted_image);
  return ScopedDecodedDrawImage(
      decoded_draw_image,
      base::BindOnce(&UnrefImageFromCache, std::move(adjusted_image), cache_,
                     decoded_draw_image));
}

PlaybackImageProvider::Settings::Settings() = default;
PlaybackImageProvider::Settings::Settings(PlaybackImageProvider::Settings&&) =
    default;
PlaybackImageProvider::Settings::~Settings() = default;
PlaybackImageProvider::Settings& PlaybackImageProvider::Settings::operator=(
    PlaybackImageProvider::Settings&&) = default;

}  // namespace cc