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| 1 // Copyright 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "cc/resources/priority_calculator.h" | |
| 6 | |
| 7 #include <algorithm> | |
| 8 | |
| 9 #include "ui/gfx/geometry/rect.h" | |
| 10 | |
| 11 namespace cc { | |
| 12 | |
| 13 static const int kNothingPriorityCutoff = -3; | |
| 14 | |
| 15 static const int kMostHighPriority = -2; | |
| 16 | |
| 17 static const int kUIDrawsToRootSurfacePriority = -1; | |
| 18 static const int kVisibleDrawsToRootSurfacePriority = 0; | |
| 19 static const int kRenderSurfacesPriority = 1; | |
| 20 static const int kUIDoesNotDrawToRootSurfacePriority = 2; | |
| 21 static const int kVisibleDoesNotDrawToRootSurfacePriority = 3; | |
| 22 | |
| 23 static const int kVisibleOnlyPriorityCutoff = 4; | |
| 24 | |
| 25 // The lower digits are how far from being visible the texture is, | |
| 26 // in pixels. | |
| 27 static const int kNotVisibleBasePriority = 1000000; | |
| 28 static const int kNotVisibleLimitPriority = 1900000; | |
| 29 | |
| 30 // Arbitrarily define "nearby" to be 2000 pixels. A better estimate | |
| 31 // would be percent-of-viewport or percent-of-screen. | |
| 32 static const int kVisibleAndNearbyPriorityCutoff = | |
| 33 kNotVisibleBasePriority + 2000; | |
| 34 | |
| 35 // Small animated layers are treated as though they are 512 pixels | |
| 36 // from being visible. | |
| 37 static const int kSmallAnimatedLayerPriority = kNotVisibleBasePriority + 512; | |
| 38 | |
| 39 static const int kLingeringBasePriority = 2000000; | |
| 40 static const int kLingeringLimitPriority = 2900000; | |
| 41 | |
| 42 static const int kMostLowPriority = 3000000; | |
| 43 | |
| 44 static const int kEverythingPriorityCutoff = 3000001; | |
| 45 | |
| 46 // static | |
| 47 int PriorityCalculator::UIPriority(bool draws_to_root_surface) { | |
| 48 return draws_to_root_surface ? kUIDrawsToRootSurfacePriority | |
| 49 : kUIDoesNotDrawToRootSurfacePriority; | |
| 50 } | |
| 51 | |
| 52 // static | |
| 53 int PriorityCalculator::VisiblePriority(bool draws_to_root_surface) { | |
| 54 return draws_to_root_surface ? kVisibleDrawsToRootSurfacePriority | |
| 55 : kVisibleDoesNotDrawToRootSurfacePriority; | |
| 56 } | |
| 57 | |
| 58 // static | |
| 59 int PriorityCalculator::RenderSurfacePriority() { | |
| 60 return kRenderSurfacesPriority; | |
| 61 } | |
| 62 | |
| 63 // static | |
| 64 int PriorityCalculator::LingeringPriority(int previous_priority) { | |
| 65 // TODO(reveman): We should remove this once we have priorities for all | |
| 66 // textures (we can't currently calculate distances for off-screen textures). | |
| 67 return std::min(kLingeringLimitPriority, | |
| 68 std::max(kLingeringBasePriority, previous_priority + 1)); | |
| 69 } | |
| 70 | |
| 71 // static | |
| 72 int PriorityCalculator::PriorityFromDistance(const gfx::Rect& visible_rect, | |
| 73 const gfx::Rect& texture_rect, | |
| 74 bool draws_to_root_surface) { | |
| 75 int distance = visible_rect.ManhattanInternalDistance(texture_rect); | |
| 76 if (!distance) | |
| 77 return VisiblePriority(draws_to_root_surface); | |
| 78 return std::min(kNotVisibleLimitPriority, kNotVisibleBasePriority + distance); | |
| 79 } | |
| 80 | |
| 81 // static | |
| 82 int PriorityCalculator::SmallAnimatedLayerMinPriority() { | |
| 83 return kSmallAnimatedLayerPriority; | |
| 84 } | |
| 85 | |
| 86 // static | |
| 87 int PriorityCalculator::HighestPriority() { | |
| 88 return kMostHighPriority; | |
| 89 } | |
| 90 | |
| 91 // static | |
| 92 int PriorityCalculator::LowestPriority() { | |
| 93 return kMostLowPriority; | |
| 94 } | |
| 95 | |
| 96 // static | |
| 97 int PriorityCalculator::AllowNothingCutoff() { | |
| 98 return kNothingPriorityCutoff; | |
| 99 } | |
| 100 | |
| 101 // static | |
| 102 int PriorityCalculator::AllowVisibleOnlyCutoff() { | |
| 103 return kVisibleOnlyPriorityCutoff; | |
| 104 } | |
| 105 | |
| 106 // static | |
| 107 int PriorityCalculator::AllowVisibleAndNearbyCutoff() { | |
| 108 return kVisibleAndNearbyPriorityCutoff; | |
| 109 } | |
| 110 | |
| 111 // static | |
| 112 int PriorityCalculator::AllowEverythingCutoff() { | |
| 113 return kEverythingPriorityCutoff; | |
| 114 } | |
| 115 | |
| 116 } // namespace cc | |
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Chromium Code Reviews
Issue 1057283003:
Remove parts of //cc we aren't using (Closed)
Base URL: git@github.com:domokit/mojo.git@master