components/viz/service/display/overlay_candidate.cc

// Copyright 2014 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_candidate.h"

#include <variant>

#include "cc/base/math_util.h"
#include "components/viz/common/quads/shared_quad_state.h"
#include "components/viz/common/quads/solid_color_draw_quad.h"
#include "components/viz/common/quads/texture_draw_quad.h"
#include "components/viz/service/debugger/viz_debugger.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/overlay_transform_utils.h"
#include "ui/gfx/video_types.h"

namespace viz {

// There is a bug in |base::optional| which causes the 'value_or' function to
// capture parameters (even constexpr parameters) as a reference.
constexpr uint32_t OverlayCandidate::kInvalidDamageIndex;
constexpr OverlayCandidate::TrackingId OverlayCandidate::kDefaultTrackingId;

OverlayCandidate::OverlayCandidate() = default;

OverlayCandidate::OverlayCandidate(const OverlayCandidate& other) = default;

OverlayCandidate::~OverlayCandidate() = default;

// static
bool OverlayCandidate::IsInvisibleQuad(const DrawQuad* quad) {
  float opacity = quad->shared_quad_state->opacity;
  if (cc::MathUtil::IsWithinEpsilon(opacity, 0.f))
    return true;
  if (quad->material != DrawQuad::Material::kSolidColor)
    return false;
  const float alpha =
      SolidColorDrawQuad::MaterialCast(quad)->color.fA * opacity;
  return quad->ShouldDrawWithBlending() &&
         cc::MathUtil::IsWithinEpsilon(alpha, 0.f);
}

// static
bool OverlayCandidate::QuadHasRoundedDisplayMasks(const DrawQuad* quad) {
  if (const auto* texture_quad = quad->DynamicCast<TextureDrawQuad>()) {
    return !texture_quad->rounded_display_masks_info.IsEmpty();
  }

  return false;
}

// static
void OverlayCandidate::ApplyClip(OverlayCandidate& candidate,
                                 const gfx::RectF& clip_rect) {
  DCHECK(std::holds_alternative<gfx::OverlayTransform>(candidate.transform));
  if (!clip_rect.Contains(candidate.display_rect)) {
    // Apply the buffer transform to the candidate's |uv_rect| so that it is
    // in the same orientation as |display_rect| when applying the clip.
    gfx::Transform buffer_transform = gfx::OverlayTransformToTransform(
        std::get<gfx::OverlayTransform>(candidate.transform), gfx::SizeF(1, 1));
    candidate.uv_rect = buffer_transform.MapRect(candidate.uv_rect);

    gfx::RectF intersect_clip_display = clip_rect;
    intersect_clip_display.Intersect(candidate.display_rect);
    gfx::RectF uv_rect = cc::MathUtil::ScaleRectProportional(
        candidate.uv_rect, candidate.display_rect, intersect_clip_display);
    candidate.display_rect = intersect_clip_display;

    // Return |uv_rect| to buffer uv space.
    candidate.uv_rect =
        buffer_transform.InverseMapRect(uv_rect).value_or(uv_rect);
  }
}

// static
bool OverlayCandidate::RequiresOverlay(const DrawQuad* quad) {
  // Regular priority hint.
  switch (quad->material) {
    case DrawQuad::Material::kTextureContent:
      return TextureDrawQuad::MaterialCast(quad)->protected_video_type ==
                 gfx::ProtectedVideoType::kHardwareProtected ||
             TextureDrawQuad::MaterialCast(quad)->overlay_priority_hint ==
                 OverlayPriority::kRequired;
    case DrawQuad::Material::kVideoHole:
      return true;
    default:
      return false;
  }
}

// static
gfx::RectF OverlayCandidate::DisplayRectInTargetSpace(
    const OverlayCandidate& candidate) {
  if (std::holds_alternative<gfx::Transform>(candidate.transform)) {
    return std::get<gfx::Transform>(candidate.transform)
        .MapRect(candidate.display_rect);
  }
  return candidate.display_rect;
}

}  // namespace viz