components/display_compositor/compositor_overlay_candidate_validator_ozone.cc

// Copyright 2014 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 "components/display_compositor/compositor_overlay_candidate_validator_ozone.h"

#include <stddef.h>

#include <utility>

#include "base/memory/ptr_util.h"
#include "cc/output/overlay_strategy_fullscreen.h"
#include "cc/output/overlay_strategy_single_on_top.h"
#include "cc/output/overlay_strategy_underlay.h"
#include "ui/ozone/public/overlay_candidates_ozone.h"

namespace display_compositor {

static gfx::BufferFormat GetBufferFormat(cc::ResourceFormat overlay_format) {
  switch (overlay_format) {
    // TODO(dshwang): overlay video still uses RGBA_8888.
    case cc::RGBA_8888:
    case cc::BGRA_8888:
      return gfx::BufferFormat::BGRA_8888;
    default:
      NOTREACHED();
      return gfx::BufferFormat::BGRA_8888;
  }
}

CompositorOverlayCandidateValidatorOzone::
    CompositorOverlayCandidateValidatorOzone(
        std::unique_ptr<ui::OverlayCandidatesOzone> overlay_candidates,
        bool single_fullscreen)
    : overlay_candidates_(std::move(overlay_candidates)),
      single_fullscreen_(single_fullscreen),
      software_mirror_active_(false) {}

CompositorOverlayCandidateValidatorOzone::
    ~CompositorOverlayCandidateValidatorOzone() {}

void CompositorOverlayCandidateValidatorOzone::GetStrategies(
    cc::OverlayProcessor::StrategyList* strategies) {
  if (single_fullscreen_) {
    strategies->push_back(
        base::MakeUnique<cc::OverlayStrategyFullscreen>(this));
  } else {
    strategies->push_back(
        base::MakeUnique<cc::OverlayStrategySingleOnTop>(this));
    strategies->push_back(base::MakeUnique<cc::OverlayStrategyUnderlay>(this));
  }
}

bool CompositorOverlayCandidateValidatorOzone::AllowCALayerOverlays() {
  return false;
}

void CompositorOverlayCandidateValidatorOzone::CheckOverlaySupport(
    cc::OverlayCandidateList* surfaces) {
  // SW mirroring copies out of the framebuffer, so we can't remove any
  // quads for overlaying, otherwise the output is incorrect.
  if (software_mirror_active_) {
    for (size_t i = 0; i < surfaces->size(); i++) {
      surfaces->at(i).overlay_handled = false;
    }
    return;
  }

  if (single_fullscreen_) {
    return;  // No need for validation for single fullscreen.
  }

  DCHECK_GE(2U, surfaces->size());
  ui::OverlayCandidatesOzone::OverlaySurfaceCandidateList ozone_surface_list;
  ozone_surface_list.resize(surfaces->size());

  for (size_t i = 0; i < surfaces->size(); i++) {
    ozone_surface_list.at(i).transform = surfaces->at(i).transform;
    ozone_surface_list.at(i).format = GetBufferFormat(surfaces->at(i).format);
    ozone_surface_list.at(i).display_rect = surfaces->at(i).display_rect;
    ozone_surface_list.at(i).crop_rect = surfaces->at(i).uv_rect;
    ozone_surface_list.at(i).quad_rect_in_target_space =
        surfaces->at(i).quad_rect_in_target_space;
    ozone_surface_list.at(i).clip_rect = surfaces->at(i).clip_rect;
    ozone_surface_list.at(i).is_clipped = surfaces->at(i).is_clipped;
    ozone_surface_list.at(i).plane_z_order = surfaces->at(i).plane_z_order;
    ozone_surface_list.at(i).buffer_size =
        surfaces->at(i).resource_size_in_pixels;
  }

  overlay_candidates_->CheckOverlaySupport(&ozone_surface_list);
  DCHECK_EQ(surfaces->size(), ozone_surface_list.size());

  for (size_t i = 0; i < surfaces->size(); i++) {
    surfaces->at(i).overlay_handled = ozone_surface_list.at(i).overlay_handled;
    surfaces->at(i).display_rect = ozone_surface_list.at(i).display_rect;
  }
}

void CompositorOverlayCandidateValidatorOzone::SetSoftwareMirrorMode(
    bool enabled) {
  software_mirror_active_ = enabled;
}

}  // namespace display_compositor