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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CC_INPUT_MAIN_THREAD_SCROLLING_REASON_H_ | 5 #ifndef CC_INPUT_MAIN_THREAD_SCROLLING_REASON_H_ |
6 #define CC_INPUT_MAIN_THREAD_SCROLLING_REASON_H_ | 6 #define CC_INPUT_MAIN_THREAD_SCROLLING_REASON_H_ |
7 | 7 |
8 namespace cc { | 8 namespace cc { |
9 | 9 |
10 // Ensure this stays in sync with MainThreadScrollingReason in histograms.xml. | 10 // Ensure this stays in sync with MainThreadScrollingReason in histograms.xml. |
11 // When adding a new MainThreadScrollingReason, make sure the corresponding | 11 // When adding a new MainThreadScrollingReason, make sure the corresponding |
12 // [MainThread/Compositor]CanSetScrollReasons function is also updated. | 12 // [MainThread/Compositor]CanSetScrollReasons function is also updated. |
13 struct MainThreadScrollingReason { | 13 struct MainThreadScrollingReason { |
14 // Non-transient scrolling reasons. | 14 // Non-transient scrolling reasons. |
15 enum : uint32_t { kNotScrollingOnMain = 0 }; | 15 enum : uint32_t { kNotScrollingOnMain = 0 }; |
16 enum : uint32_t { kHasBackgroundAttachmentFixedObjects = 1 << 0 }; | 16 enum : uint32_t { kHasBackgroundAttachmentFixedObjects = 1 << 0 }; |
17 enum : uint32_t { kHasNonLayerViewportConstrainedObjects = 1 << 1 }; | 17 enum : uint32_t { kHasNonLayerViewportConstrainedObjects = 1 << 1 }; |
18 enum : uint32_t { kThreadedScrollingDisabled = 1 << 2 }; | 18 enum : uint32_t { kThreadedScrollingDisabled = 1 << 2 }; |
19 enum : uint32_t { kScrollbarScrolling = 1 << 3 }; | 19 enum : uint32_t { kScrollbarScrolling = 1 << 3 }; |
20 enum : uint32_t { kPageOverlay = 1 << 4 }; | 20 enum : uint32_t { kPageOverlay = 1 << 4 }; |
21 enum : uint32_t { kAnimatingScrollOnMainThread = 1 << 13 }; | 21 enum : uint32_t { kAnimatingScrollOnMainThread = 1 << 13 }; |
| 22 enum : uint32_t { kHasStickyPositionObjects = 1 << 14 }; |
22 | 23 |
23 // Transient scrolling reasons. These are computed for each scroll begin. | 24 // Transient scrolling reasons. These are computed for each scroll begin. |
24 enum : uint32_t { kNonFastScrollableRegion = 1 << 5 }; | 25 enum : uint32_t { kNonFastScrollableRegion = 1 << 5 }; |
25 enum : uint32_t { kEventHandlers = 1 << 6 }; | 26 enum : uint32_t { kEventHandlers = 1 << 6 }; |
26 enum : uint32_t { kFailedHitTest = 1 << 7 }; | 27 enum : uint32_t { kFailedHitTest = 1 << 7 }; |
27 enum : uint32_t { kNoScrollingLayer = 1 << 8 }; | 28 enum : uint32_t { kNoScrollingLayer = 1 << 8 }; |
28 enum : uint32_t { kNotScrollable = 1 << 9 }; | 29 enum : uint32_t { kNotScrollable = 1 << 9 }; |
29 enum : uint32_t { kContinuingMainThreadScroll = 1 << 10 }; | 30 enum : uint32_t { kContinuingMainThreadScroll = 1 << 10 }; |
30 enum : uint32_t { kNonInvertibleTransform = 1 << 11 }; | 31 enum : uint32_t { kNonInvertibleTransform = 1 << 11 }; |
31 enum : uint32_t { kPageBasedScrolling = 1 << 12 }; | 32 enum : uint32_t { kPageBasedScrolling = 1 << 12 }; |
32 | 33 |
33 // The number of flags in this struct (excluding itself). | 34 // The number of flags in this struct (excluding itself). |
34 enum : uint32_t { kMainThreadScrollingReasonCount = 15 }; | 35 enum : uint32_t { kMainThreadScrollingReasonCount = 16 }; |
35 | 36 |
36 // Returns true if the given MainThreadScrollingReason can be set by the main | 37 // Returns true if the given MainThreadScrollingReason can be set by the main |
37 // thread. | 38 // thread. |
38 static bool MainThreadCanSetScrollReasons(uint32_t reasons) { | 39 static bool MainThreadCanSetScrollReasons(uint32_t reasons) { |
39 uint32_t reasons_set_by_main_thread = | 40 uint32_t reasons_set_by_main_thread = |
40 kNotScrollingOnMain | kHasBackgroundAttachmentFixedObjects | | 41 kNotScrollingOnMain | kHasBackgroundAttachmentFixedObjects | |
41 kHasNonLayerViewportConstrainedObjects | kThreadedScrollingDisabled | | 42 kHasNonLayerViewportConstrainedObjects | kThreadedScrollingDisabled | |
42 kScrollbarScrolling | kPageOverlay | kAnimatingScrollOnMainThread; | 43 kScrollbarScrolling | kPageOverlay | kAnimatingScrollOnMainThread | |
| 44 kHasStickyPositionObjects; |
43 return (reasons & reasons_set_by_main_thread) == reasons; | 45 return (reasons & reasons_set_by_main_thread) == reasons; |
44 } | 46 } |
45 | 47 |
46 // Returns true if the given MainThreadScrollingReason can be set by the | 48 // Returns true if the given MainThreadScrollingReason can be set by the |
47 // compositor. | 49 // compositor. |
48 static bool CompositorCanSetScrollReasons(uint32_t reasons) { | 50 static bool CompositorCanSetScrollReasons(uint32_t reasons) { |
49 uint32_t reasons_set_by_compositor = | 51 uint32_t reasons_set_by_compositor = |
50 kNonFastScrollableRegion | kEventHandlers | kFailedHitTest | | 52 kNonFastScrollableRegion | kEventHandlers | kFailedHitTest | |
51 kNoScrollingLayer | kNotScrollable | kContinuingMainThreadScroll | | 53 kNoScrollingLayer | kNotScrollable | kContinuingMainThreadScroll | |
52 kNonInvertibleTransform | kPageBasedScrolling; | 54 kNonInvertibleTransform | kPageBasedScrolling; |
53 return (reasons & reasons_set_by_compositor) == reasons; | 55 return (reasons & reasons_set_by_compositor) == reasons; |
54 } | 56 } |
55 }; | 57 }; |
56 | 58 |
57 } // namespace cc | 59 } // namespace cc |
58 | 60 |
59 #endif // CC_INPUT_MAIN_THREAD_SCROLLING_REASON_H_ | 61 #endif // CC_INPUT_MAIN_THREAD_SCROLLING_REASON_H_ |
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