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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/ozone/platform/wayland/gpu/wayland_overlay_manager.h"
#include <variant>
#include "base/logging.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/ozone/platform/wayland/common/wayland_util.h"
#include "ui/ozone/platform/wayland/gpu/wayland_buffer_manager_gpu.h"
#include "ui/ozone/platform/wayland/gpu/wayland_overlay_candidates.h"
#include "ui/ozone/public/overlay_surface_candidate.h"
namespace ui {
namespace {
void NotifyOverlayDelegationLimitedCapabilityOnce() {
static bool logged_once = false;
if (!logged_once) {
DLOG(ERROR)
<< "Subpixel accurate position is not available. Only some quads "
"can be forwarded as overlays.";
logged_once = true;
}
}
} // namespace
WaylandOverlayManager::WaylandOverlayManager(
WaylandBufferManagerGpu* manager_gpu)
: manager_gpu_(manager_gpu) {}
WaylandOverlayManager::~WaylandOverlayManager() = default;
std::unique_ptr<OverlayCandidatesOzone>
WaylandOverlayManager::CreateOverlayCandidates(gfx::AcceleratedWidget widget) {
return std::make_unique<WaylandOverlayCandidates>(this, widget);
}
void WaylandOverlayManager::SetContextDelegated() {
is_delegated_context_ = true;
}
void WaylandOverlayManager::CheckOverlaySupport(
std::vector<OverlaySurfaceCandidate>* candidates,
gfx::AcceleratedWidget widget) {
for (auto& candidate : *candidates) {
bool can_handle = CanHandleCandidate(candidate, widget);
// CanHandleCandidate() should never return false if the candidate is
// the primary plane.
DCHECK(can_handle || candidate.plane_z_order != 0);
candidate.overlay_handled = can_handle;
}
}
bool WaylandOverlayManager::CanHandleCandidate(
const OverlaySurfaceCandidate& candidate,
gfx::AcceleratedWidget widget) const {
if (!manager_gpu_->SupportsFormat(candidate.format))
return false;
// TODO( https://crbug.com/331241180 ): Quads can come into overlay processor
// with 'rect's having position and size as pseudo nonsense values. Here we
// avoid we fail handling the candidate and avoid passing them through
// wayland.
// Wayland 'wl_fixed_t' allows for 23 bits of integer precision. Here we are
// very conservative and limit to 20 bits.
constexpr auto kMaxWaylandFixed = 1 << 20;
constexpr auto kMaxWaylandRect =
gfx::RectF(-kMaxWaylandFixed, -kMaxWaylandFixed, kMaxWaylandFixed * 2,
kMaxWaylandFixed * 2);
if (!kMaxWaylandRect.Contains(candidate.display_rect)) {
return false;
}
// Passing an empty surface size through wayland will actually clear the size
// restriction and display the buffer at full size. The function
// 'set_destination_size' in augmenter will accept empty sizes without
// protocol error but interprets this as a clear.
// TODO(crbug.com/40218274) : Move and generalize this fix in wayland
// host.
constexpr int kAssumedMaxDeviceScaleFactor = 8;
if (wl_fixed_from_double(candidate.display_rect.width() /
kAssumedMaxDeviceScaleFactor) == 0 ||
wl_fixed_from_double(candidate.display_rect.height() /
kAssumedMaxDeviceScaleFactor) == 0)
return false;
if (std::holds_alternative<gfx::OverlayTransform>(candidate.transform)) {
if (std::get<gfx::OverlayTransform>(candidate.transform) ==
gfx::OVERLAY_TRANSFORM_INVALID) {
return false;
}
} else if (std::get<gfx::Transform>(candidate.transform).HasPerspective()) {
// Wayland supports only 2d matrix transforms.
return false;
}
// Wayland doesn't support clip_rect, background_color.
if (candidate.clip_rect || candidate.background_color.has_value()) {
return false;
}
if (is_delegated_context_) {
// Subpixel accurate position is not available.
NotifyOverlayDelegationLimitedCapabilityOnce();
}
// Reject candidates that don't fall on a pixel boundary.
if (!gfx::IsNearestRectWithinDistance(candidate.display_rect, 0.01f))
return false;
return true;
}
} // namespace ui
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