| /* |
| * Copyright (C) 2012 Apple Inc. All rights reserved. |
| * Copyright (C) 2014 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef LayoutGeometryMapStep_h |
| #define LayoutGeometryMapStep_h |
| |
| #include <memory> |
| #include "platform/geometry/LayoutSize.h" |
| #include "platform/transforms/TransformationMatrix.h" |
| #include "platform/wtf/Allocator.h" |
| |
| namespace blink { |
| |
| class LayoutObject; |
| |
| enum GeometryInfoFlag { |
| kAccumulatingTransform = 1 << 0, |
| kIsNonUniform = |
| 1 |
| << 1, // Mapping depends on the input point, e.g. because of CSS columns. |
| kIsFixedPosition = 1 << 2, |
| kContainsFixedPosition = 1 << 3, |
| }; |
| typedef unsigned GeometryInfoFlags; |
| |
| // Stores data about how to map from one layoutObject to its container. |
| struct LayoutGeometryMapStep { |
| DISALLOW_NEW_EXCEPT_PLACEMENT_NEW(); |
| LayoutGeometryMapStep(const LayoutGeometryMapStep& o) |
| : layout_object_(o.layout_object_), |
| offset_(o.offset_), |
| offset_for_fixed_position_(o.offset_for_fixed_position_), |
| offset_for_sticky_position_(o.offset_for_sticky_position_), |
| flags_(o.flags_) { |
| DCHECK(!o.transform_); |
| } |
| LayoutGeometryMapStep(const LayoutObject* layout_object, |
| GeometryInfoFlags flags) |
| : layout_object_(layout_object), flags_(flags) {} |
| const LayoutObject* layout_object_; |
| LayoutSize offset_; |
| std::unique_ptr<TransformationMatrix> |
| transform_; // Includes offset if non-null. |
| // If m_offsetForFixedPosition could only apply to the fixed position steps, |
| // we may be able to merge with m_offsetForStickyPosition and simplify |
| // mapping. |
| LayoutSize offset_for_fixed_position_; |
| LayoutSize offset_for_sticky_position_; |
| GeometryInfoFlags flags_; |
| }; |
| |
| } // namespace blink |
| |
| WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS( |
| blink::LayoutGeometryMapStep); |
| |
| #endif // LayoutGeometryMapStep_h |
