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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/priority_calculator.h" | |
| 6 | |
| 7 #include "ui/gfx/rect.h" | |
| 8 | |
| 9 namespace cc { | |
| 10 | |
| 11 static const int kNothingPriorityCutoff = -3; | |
| 12 | |
| 13 static const int kMostHighPriority = -2; | |
| 14 | |
| 15 static const int kUIDrawsToRootSurfacePriority = -1; | |
| 16 static const int kVisibleDrawsToRootSurfacePriority = 0; | |
| 17 static const int kRenderSurfacesPriority = 1; | |
| 18 static const int kUIDoesNotDrawToRootSurfacePriority = 2; | |
| 19 static const int kVisibleDoesNotDrawToRootSurfacePriority = 3; | |
| 20 | |
| 21 static const int kVisibleOnlyPriorityCutoff = 4; | |
| 22 | |
| 23 // The lower digits are how far from being visible the texture is, | |
| 24 // in pixels. | |
| 25 static const int kNotVisibleBasePriority = 1000000; | |
| 26 static const int kNotVisibleLimitPriority = 1900000; | |
| 27 | |
| 28 // Arbitrarily define "nearby" to be 2000 pixels. A better estimate | |
| 29 // would be percent-of-viewport or percent-of-screen. | |
| 30 static const int kVisibleAndNearbyPriorityCutoff = | |
| 31 kNotVisibleBasePriority + 2000; | |
| 32 | |
| 33 // Small animated layers are treated as though they are 512 pixels | |
| 34 // from being visible. | |
| 35 static const int kSmallAnimatedLayerPriority = kNotVisibleBasePriority + 512; | |
| 36 | |
| 37 static const int kLingeringBasePriority = 2000000; | |
| 38 static const int kLingeringLimitPriority = 2900000; | |
| 39 | |
| 40 static const int kMostLowPriority = 3000000; | |
| 41 | |
| 42 static const int kEverythingPriorityCutoff = 3000001; | |
| 43 | |
| 44 // static | |
| 45 int PriorityCalculator::UIPriority(bool draws_to_root_surface) { | |
| 46 return draws_to_root_surface ? kUIDrawsToRootSurfacePriority | |
| 47 : kUIDoesNotDrawToRootSurfacePriority; | |
| 48 } | |
| 49 | |
| 50 // static | |
| 51 int PriorityCalculator::VisiblePriority(bool draws_to_root_surface) { | |
| 52 return draws_to_root_surface ? kVisibleDrawsToRootSurfacePriority | |
| 53 : kVisibleDoesNotDrawToRootSurfacePriority; | |
| 54 } | |
| 55 | |
| 56 // static | |
| 57 int PriorityCalculator::RenderSurfacePriority() { | |
| 58 return kRenderSurfacesPriority; | |
| 59 } | |
| 60 | |
| 61 // static | |
| 62 int PriorityCalculator::LingeringPriority(int previous_priority) { | |
| 63 // FIXME: We should remove this once we have priorities for all | |
| 64 // textures (we can't currently calculate distances for | |
| 65 // off-screen textures). | |
| 66 return std::min(kLingeringLimitPriority, | |
| 67 std::max(kLingeringBasePriority, previous_priority + 1)); | |
| 68 } | |
| 69 | |
| 70 namespace { | |
| 71 int ManhattanDistance(gfx::Rect a, gfx::Rect b) { | |
| 72 gfx::Rect c = gfx::UnionRects(a, b); | |
| 73 int x = std::max(0, c.width() - a.width() - b.width() + 1); | |
| 74 int y = std::max(0, c.height() - a.height() - b.height() + 1); | |
| 75 return (x + y); | |
| 76 } | |
| 77 } | |
| 78 | |
| 79 // static | |
| 80 int PriorityCalculator::PriorityFromDistance(gfx::Rect visible_rect, | |
| 81 gfx::Rect texture_rect, | |
| 82 bool draws_to_root_surface) { | |
| 83 int distance = ManhattanDistance(visible_rect, texture_rect); | |
| 84 if (!distance) | |
| 85 return VisiblePriority(draws_to_root_surface); | |
| 86 return std::min(kNotVisibleLimitPriority, kNotVisibleBasePriority + distance); | |
| 87 } | |
| 88 | |
| 89 // static | |
| 90 int PriorityCalculator::SmallAnimatedLayerMinPriority() { | |
| 91 return kSmallAnimatedLayerPriority; | |
| 92 } | |
| 93 | |
| 94 // static | |
| 95 int PriorityCalculator::HighestPriority() { | |
| 96 return kMostHighPriority; | |
| 97 } | |
| 98 | |
| 99 // static | |
| 100 int PriorityCalculator::LowestPriority() { | |
| 101 return kMostLowPriority; | |
| 102 } | |
| 103 | |
| 104 // static | |
| 105 int PriorityCalculator::AllowNothingCutoff() { | |
| 106 return kNothingPriorityCutoff; | |
| 107 } | |
| 108 | |
| 109 // static | |
| 110 int PriorityCalculator::AllowVisibleOnlyCutoff() { | |
| 111 return kVisibleOnlyPriorityCutoff; | |
| 112 } | |
| 113 | |
| 114 // static | |
| 115 int PriorityCalculator::AllowVisibleAndNearbyCutoff() { | |
| 116 return kVisibleAndNearbyPriorityCutoff; | |
| 117 } | |
| 118 | |
| 119 // static | |
| 120 int PriorityCalculator::AllowEverythingCutoff() { | |
| 121 return kEverythingPriorityCutoff; | |
| 122 } | |
| 123 | |
| 124 } // namespace cc | |
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Chromium Code Reviews
Issue 12471007:
Part 8 of cc/ directory shuffles: resources (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src