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// Copyright 2017 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.
#ifndef UI_GFX_PRESENTAION_FEEDBACK_H_
#define UI_GFX_PRESENTAION_FEEDBACK_H_
#include <stdint.h>
#include "base/time/time.h"
namespace gfx {
// The feedback for gl::GLSurface methods |SwapBuffers|, |SwapBuffersAsync|,
// |SwapBuffersWithBounds|, |PostSubBuffer|, |PostSubBufferAsync|,
// |CommitOverlayPlanes|,|CommitOverlayPlanesAsync|, etc.
struct PresentationFeedback {
PresentationFeedback() = default;
PresentationFeedback(base::TimeTicks timestamp,
base::TimeDelta interval,
uint32_t flags)
: timestamp(timestamp), interval(interval), flags(flags) {}
// The time when a buffer begins scan-out. If a buffer is never presented on
// a screen, the |timestamp| will be set to 0.
base::TimeTicks timestamp;
// An estimated interval from the |timestamp| to the next refresh.
base::TimeDelta interval;
enum Flags {
// The presentation was synchronized to VSYNC.
kVSync = 1 << 0,
// The presentation |timestamp| is converted from hardware clock by driver.
// Sampling a clock in user space is not acceptable for this flag.
kHWClock = 1 << 1,
// The display hardware signalled that it started using the new content. The
// opposite of this is e.g. a timer being used to guess when the display
// hardware has switched to the new image content.
kHWCompletion = 1 << 2,
// The presentation of this update was done zero-copy. Possible zero-copy
// cases include direct scanout of a fullscreen surface and a surface on a
// hardware overlay.
kZeroCopy = 1 << 3,
};
// A combination of Flags. It indicates the kind of the |timestamp|.
uint32_t flags = 0;
};
inline bool operator==(const PresentationFeedback& lhs,
const PresentationFeedback& rhs) {
return lhs.timestamp == rhs.timestamp && lhs.interval == rhs.interval &&
lhs.flags == rhs.flags;
}
inline bool operator!=(const PresentationFeedback& lhs,
const PresentationFeedback& rhs) {
return !(lhs == rhs);
}
} // namespace gfx
#endif // UI_GFX_PRESENTAION_FEEDBACK_H_
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