The Tor Browser / file comparison
comparison: layout/base/ActiveLayerTracker.h
layout/base/ActiveLayerTracker.h
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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 #ifndef ACTIVELAYERTRACKER_H_ | |
| 6 #define ACTIVELAYERTRACKER_H_ | |
| 7 | |
| 8 #include "nsCSSProperty.h" | |
| 9 | |
| 10 class nsIFrame; | |
| 11 | |
| 12 namespace mozilla { | |
| 13 | |
| 14 /** | |
| 15 * This class receives various notifications about style changes and content | |
| 16 * changes that affect layerization decisions, and implements the heuristics | |
| 17 * that drive those decisions. It manages per-frame state to support those | |
| 18 * heuristics. | |
| 19 */ | |
| 20 class ActiveLayerTracker { | |
| 21 public: | |
| 22 static void Shutdown(); | |
| 23 | |
| 24 /* | |
| 25 * We track style changes to selected styles: | |
| 26 * eCSSProperty_transform | |
| 27 * eCSSProperty_opacity | |
| 28 * eCSSProperty_left, eCSSProperty_top, eCSSProperty_right, eCSSProperty_bottom | |
| 29 * and use that information to guess whether style changes are animated. | |
| 30 */ | |
| 31 | |
| 32 /** | |
| 33 * Notify aFrame's style property as having changed due to a restyle, | |
| 34 * and therefore possibly wanting an active layer to render that style. | |
| 35 * Any such marking will time out after a short period. | |
| 36 * @param aProperty the property that has changed | |
| 37 */ | |
| 38 static void NotifyRestyle(nsIFrame* aFrame, nsCSSProperty aProperty); | |
| 39 /** | |
| 40 * Notify aFrame's left/top/right/bottom properties as having (maybe) | |
| 41 * changed due to a restyle, and therefore possibly wanting an active layer | |
| 42 * to render that style. Any such marking will time out after a short period. | |
| 43 */ | |
| 44 static void NotifyOffsetRestyle(nsIFrame* aFrame); | |
| 45 /** | |
| 46 * Mark aFrame as being known to have an animation of aProperty. | |
| 47 * Any such marking will time out after a short period. | |
| 48 */ | |
| 49 static void NotifyAnimated(nsIFrame* aFrame, nsCSSProperty aProperty); | |
| 50 /** | |
| 51 * Notify that a property in the inline style rule of aFrame's element | |
| 52 * has been modified. | |
| 53 * This notification is incomplete --- not all modifications to inline | |
| 54 * style will trigger this. | |
| 55 */ | |
| 56 static void NotifyInlineStyleRuleModified(nsIFrame* aFrame, nsCSSProperty aProperty); | |
| 57 /** | |
| 58 * Return true if aFrame's aProperty style should be considered as being animated | |
| 59 * for constructing active layers. | |
| 60 */ | |
| 61 static bool IsStyleAnimated(nsIFrame* aFrame, nsCSSProperty aProperty); | |
| 62 /** | |
| 63 * Return true if any of aFrame's offset property styles should be considered | |
| 64 * as being animated for constructing active layers. | |
| 65 */ | |
| 66 static bool IsOffsetOrMarginStyleAnimated(nsIFrame* aFrame); | |
| 67 | |
| 68 /* | |
| 69 * We track modifications to the content of certain frames (i.e. canvas frames) | |
| 70 * and use that to make layering decisions. | |
| 71 */ | |
| 72 | |
| 73 /** | |
| 74 * Mark aFrame's content as being active. This marking will time out after | |
| 75 * a short period. | |
| 76 */ | |
| 77 static void NotifyContentChange(nsIFrame* aFrame); | |
| 78 /** | |
| 79 * Return true if this frame's content is still marked as active. | |
| 80 */ | |
| 81 static bool IsContentActive(nsIFrame* aFrame); | |
| 82 }; | |
| 83 | |
| 84 } | |
| 85 | |
| 86 #endif /* ACTIVELAYERTRACKER_H_ */ |
