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// Copyright 2015 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 "ui/ozone/platform/cast/overlay_manager_cast.h"
#include "base/bind.h"
#include "base/location.h"
#include "base/memory/ref_counted.h"
#include "base/single_thread_task_runner.h"
#include "chromecast/media/base/media_message_loop.h"
#include "chromecast/public/cast_media_shlib.h"
#include "chromecast/public/graphics_types.h"
#include "chromecast/public/video_plane.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/ozone/public/overlay_candidates_ozone.h"
namespace ui {
namespace {
// Helper class for calling VideoPlane::SetGeometry with rate-limiting.
// SetGeometry can take on the order of 100ms to run in some implementations
// and can be called on the order of 20x / second (as fast as graphics frames
// are produced). This creates an ever-growing backlog of tasks on the media
// thread.
// This class measures the time taken to run SetGeometry to determine a
// reasonable frequency at which to call it. Excess calls are coalesced
// to just set the most recent geometry.
class RateLimitedSetVideoPlaneGeometry
: public base::RefCountedThreadSafe<RateLimitedSetVideoPlaneGeometry> {
public:
RateLimitedSetVideoPlaneGeometry(
const scoped_refptr<base::SingleThreadTaskRunner>& task_runner)
: pending_display_rect_(0, 0, 0, 0),
pending_set_geometry_(false),
min_calling_interval_ms_(0),
sample_counter_(0),
task_runner_(task_runner) {}
void SetGeometry(
const chromecast::RectF& display_rect,
chromecast::media::VideoPlane::CoordinateType coordinate_type,
chromecast::media::VideoPlane::Transform transform) {
DCHECK(task_runner_->BelongsToCurrentThread());
base::TimeTicks now = base::TimeTicks::Now();
base::TimeDelta elapsed = now - last_set_geometry_time_;
if (elapsed < base::TimeDelta::FromMilliseconds(min_calling_interval_ms_)) {
if (!pending_set_geometry_) {
pending_set_geometry_ = true;
task_runner_->PostDelayedTask(
FROM_HERE,
base::Bind(
&RateLimitedSetVideoPlaneGeometry::ApplyPendingSetGeometry,
this),
base::TimeDelta::FromMilliseconds(2 * min_calling_interval_ms_));
}
pending_display_rect_ = display_rect;
pending_coordinate_type_ = coordinate_type;
pending_transform_ = transform;
return;
}
last_set_geometry_time_ = now;
chromecast::media::VideoPlane* video_plane =
chromecast::media::CastMediaShlib::GetVideoPlane();
CHECK(video_plane);
base::TimeTicks start = base::TimeTicks::Now();
video_plane->SetGeometry(display_rect, coordinate_type, transform);
base::TimeDelta set_geometry_time = base::TimeTicks::Now() - start;
UpdateAverageTime(set_geometry_time.InMilliseconds());
}
private:
friend class base::RefCountedThreadSafe<RateLimitedSetVideoPlaneGeometry>;
~RateLimitedSetVideoPlaneGeometry() {}
void UpdateAverageTime(int64 sample) {
const size_t kSampleCount = 5;
if (samples_.size() < kSampleCount)
samples_.push_back(sample);
else
samples_[sample_counter_++ % kSampleCount] = sample;
int64 total = 0;
for (int64 s : samples_)
total += s;
min_calling_interval_ms_ = 2 * total / samples_.size();
}
void ApplyPendingSetGeometry() {
if (pending_set_geometry_) {
pending_set_geometry_ = false;
SetGeometry(pending_display_rect_, pending_coordinate_type_,
pending_transform_);
}
}
chromecast::RectF pending_display_rect_;
chromecast::media::VideoPlane::CoordinateType pending_coordinate_type_;
chromecast::media::VideoPlane::Transform pending_transform_;
bool pending_set_geometry_;
base::TimeTicks last_set_geometry_time_;
// Don't call SetGeometry faster than this interval.
int64 min_calling_interval_ms_;
// Min calling interval is computed as double average of last few time samples
// (i.e. allow at least as much time between calls as the call itself takes).
std::vector<int64> samples_;
size_t sample_counter_;
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
DISALLOW_COPY_AND_ASSIGN(RateLimitedSetVideoPlaneGeometry);
};
// Translates a gfx::OverlayTransform into a VideoPlane::Transform.
// Could be just a lookup table once we have unit tests for this code
// to ensure it stays in sync with OverlayTransform.
chromecast::media::VideoPlane::Transform ConvertTransform(
gfx::OverlayTransform transform) {
switch (transform) {
case gfx::OVERLAY_TRANSFORM_NONE:
return chromecast::media::VideoPlane::TRANSFORM_NONE;
case gfx::OVERLAY_TRANSFORM_FLIP_HORIZONTAL:
return chromecast::media::VideoPlane::FLIP_HORIZONTAL;
case gfx::OVERLAY_TRANSFORM_FLIP_VERTICAL:
return chromecast::media::VideoPlane::FLIP_VERTICAL;
case gfx::OVERLAY_TRANSFORM_ROTATE_90:
return chromecast::media::VideoPlane::ROTATE_90;
case gfx::OVERLAY_TRANSFORM_ROTATE_180:
return chromecast::media::VideoPlane::ROTATE_180;
case gfx::OVERLAY_TRANSFORM_ROTATE_270:
return chromecast::media::VideoPlane::ROTATE_270;
default:
NOTREACHED();
return chromecast::media::VideoPlane::TRANSFORM_NONE;
}
}
bool ExactlyEqual(const chromecast::RectF& r1, const chromecast::RectF& r2) {
return r1.x == r2.x && r1.y == r2.y && r1.width == r2.width &&
r1.height == r2.height;
}
class OverlayCandidatesCast : public OverlayCandidatesOzone {
public:
OverlayCandidatesCast()
: media_task_runner_(
chromecast::media::MediaMessageLoop::GetTaskRunner()),
transform_(gfx::OVERLAY_TRANSFORM_INVALID),
display_rect_(0, 0, 0, 0),
video_plane_wrapper_(
new RateLimitedSetVideoPlaneGeometry(media_task_runner_)) {}
void CheckOverlaySupport(OverlaySurfaceCandidateList* surfaces) override;
private:
scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
gfx::OverlayTransform transform_;
chromecast::RectF display_rect_;
scoped_refptr<RateLimitedSetVideoPlaneGeometry> video_plane_wrapper_;
};
void OverlayCandidatesCast::CheckOverlaySupport(
OverlaySurfaceCandidateList* surfaces) {
for (auto& candidate : *surfaces) {
if (candidate.plane_z_order != -1)
continue;
candidate.overlay_handled = true;
// Compositor requires all overlay rectangles to have integer coords
candidate.display_rect = gfx::ToEnclosedRect(candidate.display_rect);
chromecast::RectF display_rect(
candidate.display_rect.x(), candidate.display_rect.y(),
candidate.display_rect.width(), candidate.display_rect.height());
// Update video plane geometry + transform to match compositor quad.
// This must be done on media thread - and no point doing if it hasn't
// changed.
if (candidate.transform != transform_ ||
!ExactlyEqual(display_rect, display_rect_)) {
transform_ = candidate.transform;
display_rect_ = display_rect;
media_task_runner_->PostTask(
FROM_HERE,
base::Bind(
&RateLimitedSetVideoPlaneGeometry::SetGeometry,
video_plane_wrapper_, display_rect,
chromecast::media::VideoPlane::COORDINATE_TYPE_GRAPHICS_PLANE,
ConvertTransform(candidate.transform)));
}
return;
}
}
} // namespace
OverlayManagerCast::OverlayManagerCast() {
}
OverlayManagerCast::~OverlayManagerCast() {
}
scoped_ptr<OverlayCandidatesOzone> OverlayManagerCast::CreateOverlayCandidates(
gfx::AcceleratedWidget w) {
return make_scoped_ptr(new OverlayCandidatesCast());
}
bool OverlayManagerCast::CanShowPrimaryPlaneAsOverlay() {
return false;
}
} // namespace ui
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