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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_TREES_CLIP_NODE_H_ | 5 #ifndef CC_TREES_CLIP_NODE_H_ |
6 #define CC_TREES_CLIP_NODE_H_ | 6 #define CC_TREES_CLIP_NODE_H_ |
7 | 7 |
8 #include <memory> | 8 #include <memory> |
9 | 9 |
10 #include "cc/base/cc_export.h" | 10 #include "cc/base/cc_export.h" |
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28 ~ClipNode(); | 28 ~ClipNode(); |
29 | 29 |
30 // The node index of this node in the clip tree node vector. | 30 // The node index of this node in the clip tree node vector. |
31 int id; | 31 int id; |
32 // The node index of the parent node in the clip tree node vector. | 32 // The node index of the parent node in the clip tree node vector. |
33 int parent_id; | 33 int parent_id; |
34 // The layer id of the layer that owns this node. | 34 // The layer id of the layer that owns this node. |
35 int owning_layer_id; | 35 int owning_layer_id; |
36 | 36 |
37 enum class ClipType { | 37 enum class ClipType { |
38 // The node doesn't contribute a new clip. It exists only for caching clips | |
39 // or for resetting clipping state. | |
40 NONE, | |
41 | |
42 // The node contributes a new clip (that is, |clip| needs to be applied). | 38 // The node contributes a new clip (that is, |clip| needs to be applied). |
43 APPLIES_LOCAL_CLIP, | 39 APPLIES_LOCAL_CLIP, |
44 | 40 |
45 // This node represents a space expansion. When computing visible rects, | 41 // This node represents a space expansion. When computing visible rects, |
46 // the accumulated clip inherited by this node gets expanded. Similarly, | 42 // the accumulated clip inherited by this node gets expanded. Similarly, |
47 // when mapping a rect in descendant space to the rect in ancestor space | 43 // when mapping a rect in descendant space to the rect in ancestor space |
48 // that depends on the descendant rect's contents, this node expands the | 44 // that depends on the descendant rect's contents, this node expands the |
49 // descendant rect. This is used for effects like pixel-moving filters, | 45 // descendant rect. This is used for effects like pixel-moving filters, |
50 // where clipped-out content can affect visible output. | 46 // where clipped-out content can affect visible output. |
51 EXPANDS_CLIP | 47 EXPANDS_CLIP |
52 }; | 48 }; |
53 | 49 |
54 ClipType clip_type; | 50 ClipType clip_type; |
55 | 51 |
56 // The clip rect that this node contributes, expressed in the space of its | 52 // The clip rect that this node contributes, expressed in the space of its |
57 // transform node. | 53 // transform node. |
58 gfx::RectF clip; | 54 gfx::RectF clip; |
59 | 55 |
56 // Each element of this cache stores the accumulated clip from this clip | |
57 // node to a particular target. | |
58 mutable std::vector<ClipRectData> cached_clip_rects; | |
59 | |
60 // This rect accumulates all clips from this node to the root in screen space. | |
61 // It is used in the computation of layer's visible rect. | |
62 gfx::RectF accumulated_rect_in_screen_space; | |
weiliangc
2017/03/14 22:04:29
Is this also a cached value? Could this be express
jaydasika
2017/03/16 20:33:30
Yes, it is a cached value and it can be expressed
| |
63 | |
60 // For nodes that expand, this represents the amount of expansion. | 64 // For nodes that expand, this represents the amount of expansion. |
61 std::unique_ptr<ClipExpander> clip_expander; | 65 std::unique_ptr<ClipExpander> clip_expander; |
62 | 66 |
63 // Clip nodes are used for two reasons. First, they are used for determining | |
64 // which parts of each layer are visible. Second, they are used for | |
65 // determining whether a clip needs to be applied when drawing a layer, and if | |
66 // so, the rect that needs to be used. These can be different since not all | |
67 // clips need to be applied directly to each layer. For example, a layer is | |
68 // implicitly clipped by the bounds of its target render surface and by clips | |
69 // applied to this surface. |combined_clip_in_target_space| is used for | |
70 // computing visible rects, and |clip_in_target_space| is used for computing | |
71 // clips applied at draw time. Both rects are expressed in the space of the | |
72 // target transform node, and may include clips contributed by ancestors. | |
73 gfx::RectF combined_clip_in_target_space; | |
74 gfx::RectF clip_in_target_space; | |
75 | |
76 // The id of the transform node that defines the clip node's local space. | 67 // The id of the transform node that defines the clip node's local space. |
77 int transform_id; | 68 int transform_id; |
78 | 69 |
79 // The id of the transform node that defines the clip node's target space. | |
80 int target_transform_id; | |
81 | |
82 // The id of the effect node that defines the clip node's target space. | |
83 // TODO(crbug.com/642581 crbug.com/642584): As we progress toward SPv2 and | |
84 // layer list mode, there may be layers having the same clip but draw onto | |
85 // different target. Target information shall be removed from here. | |
86 int target_effect_id; | |
87 | |
88 // When true, |clip_in_target_space| does not include clips from ancestor | |
89 // nodes. | |
90 bool layer_clipping_uses_only_local_clip : 1; | |
91 | |
92 // True if layers with this clip tree node need to be drawn with a clip | |
93 // applied. | |
94 bool layers_are_clipped : 1; | |
95 bool layers_are_clipped_when_surfaces_disabled : 1; | |
96 | |
97 // Nodes that correspond to unclipped surfaces disregard ancestor clips. | |
98 bool resets_clip : 1; | |
99 | |
100 bool operator==(const ClipNode& other) const; | 70 bool operator==(const ClipNode& other) const; |
101 | 71 |
102 void AsValueInto(base::trace_event::TracedValue* value) const; | 72 void AsValueInto(base::trace_event::TracedValue* value) const; |
103 }; | 73 }; |
104 | 74 |
105 } // namespace cc | 75 } // namespace cc |
106 | 76 |
107 #endif // CC_TREES_CLIP_NODE_H_ | 77 #endif // CC_TREES_CLIP_NODE_H_ |
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