File: overlay_strategy_underlay_cast.cc

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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/viz/service/display/overlay_strategy_underlay_cast.h"

#include <utility>
#include <variant>
#include <vector>

#include "base/containers/adapters.h"
#include "base/logging.h"
#include "base/no_destructor.h"
#include "base/unguessable_token.h"
#include "build/chromecast_buildflags.h"
#include "components/viz/common/quads/draw_quad.h"
#include "components/viz/common/quads/solid_color_draw_quad.h"
#include "components/viz/common/quads/video_hole_draw_quad.h"
#include "components/viz/service/display/overlay_candidate_factory.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "ui/gfx/geometry/rect_conversions.h"

namespace viz {

namespace {

// This persistent mojo::Remote is bound then used by all the instances
// of OverlayStrategyUnderlayCast.
mojo::Remote<chromecast::media::mojom::VideoGeometrySetter>&
GetVideoGeometrySetter() {
  static base::NoDestructor<
      mojo::Remote<chromecast::media::mojom::VideoGeometrySetter>>
      g_video_geometry_setter;
  return *g_video_geometry_setter;
}

}  // namespace

OverlayStrategyUnderlayCast::OverlayStrategyUnderlayCast(
    OverlayProcessorUsingStrategy* capability_checker)
    : OverlayStrategyUnderlay(capability_checker) {}

OverlayStrategyUnderlayCast::~OverlayStrategyUnderlayCast() = default;

void OverlayStrategyUnderlayCast::Propose(
    const SkM44& output_color_matrix,
    const OverlayProcessorInterface::FilterOperationsMap& render_pass_filters,
    const OverlayProcessorInterface::FilterOperationsMap&
        render_pass_backdrop_filters,
    const DisplayResourceProvider* resource_provider,
    AggregatedRenderPassList* render_pass_list,
    SurfaceDamageRectList* surface_damage_rect_list,
    const PrimaryPlane* primary_plane,
    std::vector<OverlayProposedCandidate>* candidates,
    std::vector<gfx::Rect>* content_bounds) {
  auto* render_pass = render_pass_list->back().get();
  QuadList& quad_list = render_pass->quad_list;
  OverlayCandidate candidate;
  candidate.overlay_type = gfx::OverlayType::kUnderlay;
  auto overlay_iter = quad_list.end();

  OverlayCandidateFactory::OverlayContext context;
  context.supports_mask_filter = true;
  OverlayCandidateFactory candidate_factory = OverlayCandidateFactory(
      render_pass, resource_provider, surface_damage_rect_list,
      &output_color_matrix, GetPrimaryPlaneDisplayRect(primary_plane),
      &render_pass_filters, context);

  // Original code did reverse iteration.
  // Here we do forward but find the last one. which should be the same thing.
  for (auto it = quad_list.begin(); it != quad_list.end(); ++it) {
    if (OverlayCandidate::IsInvisibleQuad(*it))
      continue;

    // Look for quads that are overlayable and require an overlay. Chromecast
    // only supports a video underlay so this can't promote all quads that are
    // overlayable, it needs to ensure that the quad requires overlays since
    // that quad is side-channeled through a secure path into an overlay
    // sitting underneath the primary plane. This is only looking at where the
    // quad is supposed to be to replace it with a transparent quad to allow
    // the underlay to be visible.
    // VIDEO_HOLE implies it requires overlay.
    if (it->material == DrawQuad::Material::kVideoHole &&
        candidate_factory.FromDrawQuad(*it, candidate) ==
            OverlayCandidate::CandidateStatus::kSuccess) {
      overlay_iter = it;
    }
  }

  if (overlay_iter != quad_list.end()) {
    candidates->emplace_back(overlay_iter, candidate, this);
  }
}

bool OverlayStrategyUnderlayCast::Attempt(
    const SkM44& output_color_matrix,
    const OverlayProcessorInterface::FilterOperationsMap& render_pass_filters,
    const OverlayProcessorInterface::FilterOperationsMap&
        render_pass_backdrop_filters,
    const DisplayResourceProvider* resource_provider,
    AggregatedRenderPassList* render_pass_list,
    SurfaceDamageRectList* surface_damage_rect_list,
    const PrimaryPlane* primary_plane,
    OverlayCandidateList* candidate_list,
    std::vector<gfx::Rect>* content_bounds,
    const OverlayProposedCandidate& proposed_candidate) {
  // Before we attempt an overlay strategy, the candidate list should be empty.
  DCHECK(candidate_list->empty());
  auto* render_pass = render_pass_list->back().get();
  QuadList& quad_list = render_pass->quad_list;
  bool found_underlay = false;
  gfx::Rect content_rect;

  OverlayCandidateFactory::OverlayContext context;
  context.supports_mask_filter = true;

  OverlayCandidateFactory candidate_factory = OverlayCandidateFactory(
      render_pass, resource_provider, surface_damage_rect_list,
      &output_color_matrix, GetPrimaryPlaneDisplayRect(primary_plane),
      &render_pass_filters, context);

  for (const auto* quad : base::Reversed(quad_list)) {
    if (OverlayCandidate::IsInvisibleQuad(quad))
      continue;

    const auto& transform = quad->shared_quad_state->quad_to_target_transform;
    gfx::Rect quad_rect = transform.MapRect(quad->rect);

    bool is_underlay = false;
    if (!found_underlay) {
      OverlayCandidate candidate;
      // Look for quads that are overlayable and require an overlay. Chromecast
      // only supports a video underlay so this can't promote all quads that are
      // overlayable, it needs to ensure that the quad requires overlays since
      // that quad is side-channeled through a secure path into an overlay
      // sitting underneath the primary plane. This is only looking at where the
      // quad is supposed to be to replace it with a transparent quad to allow
      // the underlay to be visible.
      // VIDEO_HOLE implies it requires overlay.
      is_underlay = quad->material == DrawQuad::Material::kVideoHole &&
                    candidate_factory.FromDrawQuad(quad, candidate) ==
                        OverlayCandidate::CandidateStatus::kSuccess;
      found_underlay = is_underlay;
    }

    if (!found_underlay && quad->material == DrawQuad::Material::kSolidColor) {
      const SolidColorDrawQuad* solid = SolidColorDrawQuad::MaterialCast(quad);
      if (solid->color == SkColors::kBlack)
        continue;
    }

    if (is_underlay) {
      content_rect.Subtract(quad_rect);
    } else {
      content_rect.Union(quad_rect);
    }
  }

  if (is_using_overlay_ != found_underlay) {
    is_using_overlay_ = found_underlay;
    LOG(INFO) << (found_underlay ? "Overlay activated" : "Overlay deactivated");
  }

  if (found_underlay) {
    for (auto it = quad_list.begin(); it != quad_list.end(); ++it) {
      OverlayCandidate candidate;
      if (it->material != DrawQuad::Material::kVideoHole ||
          candidate_factory.FromDrawQuad(*it, candidate) !=
              OverlayCandidate::CandidateStatus::kSuccess) {
        continue;
      }

      OverlayProposedCandidate proposed_to_commit(it, candidate, this);
      CommitCandidate(proposed_to_commit, render_pass);

      break;
    }
  }

  DCHECK(content_bounds && content_bounds->empty());
  if (found_underlay) {
    content_bounds->push_back(content_rect);
  }
  return found_underlay;
}

void OverlayStrategyUnderlayCast::CommitCandidate(
    const OverlayProposedCandidate& proposed_candidate,
    AggregatedRenderPass* render_pass) {
  DCHECK(GetVideoGeometrySetter());
  GetVideoGeometrySetter()->SetVideoGeometry(
      proposed_candidate.candidate.display_rect,
      std::get<gfx::OverlayTransform>(proposed_candidate.candidate.transform),
      VideoHoleDrawQuad::MaterialCast(*proposed_candidate.quad_iter)
          ->overlay_plane_id);

  if (proposed_candidate.candidate.has_mask_filter) {
    render_pass->ReplaceExistingQuadWithSolidColor(
        proposed_candidate.quad_iter, SkColors::kBlack, SkBlendMode::kDstOut);
  } else {
    render_pass->ReplaceExistingQuadWithSolidColor(proposed_candidate.quad_iter,
                                                   SkColors::kTransparent,
                                                   SkBlendMode::kSrcOver);
  }
}

OverlayStrategy OverlayStrategyUnderlayCast::GetUMAEnum() const {
  return OverlayStrategy::kUnderlayCast;
}

// static
void OverlayStrategyUnderlayCast::ConnectVideoGeometrySetter(
    mojo::PendingRemote<chromecast::media::mojom::VideoGeometrySetter>
        video_geometry_setter) {
  GetVideoGeometrySetter().Bind(std::move(video_geometry_setter));
}

}  // namespace viz