// 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/flow/layers/picture_layer.h"

#include "flutter/fml/logging.h"

namespace flutter {

PictureLayer::PictureLayer(const SkPoint& offset,
                           SkiaGPUObject<SkPicture> picture,
                           bool is_complex,
                           bool will_change,
                           size_t external_size)
    : Layer(external_size),
      offset_(offset),
      picture_(std::move(picture)),
      is_complex_(is_complex),
      will_change_(will_change) {}

void PictureLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) {
  TRACE_EVENT0("flutter", "PictureLayer::Preroll");

#if defined(LEGACY_FUCHSIA_EMBEDDER)
  CheckForChildLayerBelow(context);
#endif

  SkPicture* sk_picture = picture();

  bool cached = false;
  if (auto* cache = context->raster_cache) {
    TRACE_EVENT0("flutter", "PictureLayer::RasterCache (Preroll)");

    SkMatrix ctm = matrix;
    ctm.postTranslate(offset_.x(), offset_.y());
#ifndef SUPPORT_FRACTIONAL_TRANSLATION
    ctm = RasterCache::GetIntegralTransCTM(ctm);
#endif
    cached = cache->Prepare(context->gr_context, sk_picture, ctm,
                            context->dst_color_space, is_complex_, will_change_,
                            external_size());
  }

  if (!cached) {
    context->uncached_external_size += external_size();
  }

  SkRect bounds = sk_picture->cullRect().makeOffset(offset_.x(), offset_.y());
  set_paint_bounds(bounds);
}

void PictureLayer::Paint(PaintContext& context) const {
  TRACE_EVENT0("flutter", "PictureLayer::Paint");
  FML_DCHECK(picture_.get());
  FML_DCHECK(needs_painting());

  SkAutoCanvasRestore save(context.leaf_nodes_canvas, true);
  context.leaf_nodes_canvas->translate(offset_.x(), offset_.y());
#ifndef SUPPORT_FRACTIONAL_TRANSLATION
  context.leaf_nodes_canvas->setMatrix(RasterCache::GetIntegralTransCTM(
      context.leaf_nodes_canvas->getTotalMatrix()));
#endif

  if (context.raster_cache &&
      context.raster_cache->Draw(*picture(), *context.leaf_nodes_canvas)) {
    TRACE_EVENT_INSTANT0("flutter", "raster cache hit");
    return;
  }
  picture()->playback(context.leaf_nodes_canvas);
}

}  // namespace flutter