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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 GeometryMapper_h | 5 #ifndef GeometryMapper_h |
| 6 #define GeometryMapper_h | 6 #define GeometryMapper_h |
| 7 | 7 |
| 8 #include "platform/geometry/FloatRect.h" | 8 #include "platform/geometry/FloatRect.h" |
| 9 #include "platform/graphics/paint/PropertyTreeState.h" | 9 #include "platform/graphics/paint/PropertyTreeState.h" |
| 10 #include "platform/transforms/TransformationMatrix.h" | 10 #include "platform/transforms/TransformationMatrix.h" |
| 11 #include "wtf/HashMap.h" | 11 #include "wtf/HashMap.h" |
| 12 | 12 |
| 13 namespace blink { | 13 namespace blink { |
| 14 | 14 |
| 15 struct PrecomputedDataForAncestor { | 15 struct PrecomputedDataForAncestor { |
| 16 // Maps from a transform node that is a descendant of the ancestor to the | 16 // Maps from a transform node that is a descendant of the ancestor to the |
| 17 // combined transform between the descendant's and the ancestor's coordinate | 17 // combined transform between the descendant's and the ancestor's coordinate |
| 18 // space. | 18 // space. |
| 19 HashMap<const TransformPaintPropertyNode*, TransformationMatrix> | 19 HashMap<const TransformPaintPropertyNode*, TransformationMatrix> |
| 20 toAncestorTransforms; | 20 toAncestorTransforms; |
| 21 | 21 |
| 22 // Maps from a descendant clip node to its equivalent "clip visual rect" in | 22 // Maps from a descendant clip node to its equivalent "clip visual rect" in |
| 23 // the space of the ancestor. The clip visual rect is defined as the | 23 // the space of the ancestor. The clip visual rect is defined as the |
| 24 // intersection of all clips between the descendant and the ancestor (*not* | 24 // intersection of all clips between the descendant and the ancestor (*not* |
| 25 // including the ancestor) in the clip tree, individually transformed from | 25 // including the ancestor) in the clip tree, individually transformed from |
| 26 // their localTransformSpace into the ancestor's localTransformSpace. | 26 // their localTransformSpace into the ancestor's localTransformSpace. |
| 27 HashMap<const ClipPaintPropertyNode*, FloatRect> toAncestorClipRects; | 27 HashMap<const ClipPaintPropertyNode*, FloatRect> toAncestorClipRects; |
| 28 | 28 |
| 29 static std::unique_ptr<PrecomputedDataForAncestor> create() { | 29 static std::unique_ptr<PrecomputedDataForAncestor> create() { |
| 30 return wrapUnique(new PrecomputedDataForAncestor()); | 30 return makeUnique<PrecomputedDataForAncestor>(); |
| 31 } | 31 } |
| 32 }; | 32 }; |
| 33 | 33 |
| 34 // GeometryMapper is a helper class for fast computations of transformed and | 34 // GeometryMapper is a helper class for fast computations of transformed and |
| 35 // visual rects in different PropertyTreeStates. The design document has a | 35 // visual rects in different PropertyTreeStates. The design document has a |
| 36 // number of details on use cases, algorithmic definitions, and running times. | 36 // number of details on use cases, algorithmic definitions, and running times. |
| 37 // | 37 // |
| 38 // NOTE: A GeometryMapper object is only valid for property trees that do not | 38 // NOTE: A GeometryMapper object is only valid for property trees that do not |
| 39 // change. If any mutation occurs, a new GeometryMapper object must be allocated | 39 // change. If any mutation occurs, a new GeometryMapper object must be allocated |
| 40 // corresponding to the new state. | 40 // corresponding to the new state. |
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| 166 m_data; | 166 m_data; |
| 167 | 167 |
| 168 const TransformationMatrix m_identity; | 168 const TransformationMatrix m_identity; |
| 169 | 169 |
| 170 DISALLOW_COPY_AND_ASSIGN(GeometryMapper); | 170 DISALLOW_COPY_AND_ASSIGN(GeometryMapper); |
| 171 }; | 171 }; |
| 172 | 172 |
| 173 } // namespace blink | 173 } // namespace blink |
| 174 | 174 |
| 175 #endif // GeometryMapper_h | 175 #endif // GeometryMapper_h |
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