| /* |
| * Copyright (C) 2011 Apple 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_TRANSFORMS_TRANSFORM_STATE_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_TRANSFORMS_TRANSFORM_STATE_H_ |
| |
| #include <memory> |
| #include "third_party/blink/renderer/platform/geometry/float_point.h" |
| #include "third_party/blink/renderer/platform/geometry/float_quad.h" |
| #include "third_party/blink/renderer/platform/geometry/int_size.h" |
| #include "third_party/blink/renderer/platform/geometry/layout_point.h" |
| #include "third_party/blink/renderer/platform/geometry/layout_size.h" |
| #include "third_party/blink/renderer/platform/transforms/affine_transform.h" |
| #include "third_party/blink/renderer/platform/transforms/transformation_matrix.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator.h" |
| |
| namespace blink { |
| |
| class PLATFORM_EXPORT TransformState { |
| STACK_ALLOCATED(); |
| |
| public: |
| enum TransformDirection { |
| kApplyTransformDirection, |
| kUnapplyInverseTransformDirection |
| }; |
| enum TransformAccumulation { kFlattenTransform, kAccumulateTransform }; |
| |
| TransformState(TransformDirection mapping_direction, |
| const FloatPoint& p, |
| const FloatQuad& quad) |
| : last_planar_point_(p), |
| last_planar_quad_(quad), |
| accumulating_transform_(false), |
| force_accumulating_transform_(false), |
| map_point_(true), |
| map_quad_(true), |
| direction_(mapping_direction) {} |
| |
| TransformState(TransformDirection mapping_direction, const FloatPoint& p) |
| : last_planar_point_(p), |
| accumulating_transform_(false), |
| force_accumulating_transform_(false), |
| map_point_(true), |
| map_quad_(false), |
| direction_(mapping_direction) {} |
| |
| TransformState(TransformDirection mapping_direction, const FloatQuad& quad) |
| : last_planar_quad_(quad), |
| accumulating_transform_(false), |
| force_accumulating_transform_(false), |
| map_point_(false), |
| map_quad_(true), |
| direction_(mapping_direction) {} |
| |
| // Accumulate a transform but don't map any points directly. |
| TransformState(TransformDirection mapping_direction) |
| : accumulated_transform_(TransformationMatrix::Create()), |
| accumulating_transform_(true), |
| force_accumulating_transform_(true), |
| map_point_(false), |
| map_quad_(false), |
| direction_(mapping_direction) {} |
| |
| TransformState(const TransformState& other) { *this = other; } |
| |
| TransformState& operator=(const TransformState&); |
| |
| // Note: this overrides the quad and ignores any accumulatedOffset. |
| // If it's desired to include the offset, call flatten() first. |
| void SetQuad(const FloatQuad& quad) { |
| DCHECK(!accumulating_transform_); |
| // FIXME: this assumes that the quad being added is in the coordinate system |
| // of the current state. This breaks if we're simultaneously mapping a |
| // point. https://bugs.webkit.org/show_bug.cgi?id=106680 |
| DCHECK(!map_point_); |
| accumulated_offset_ = LayoutSize(); |
| last_planar_quad_ = quad; |
| } |
| |
| void Move(LayoutUnit x, |
| LayoutUnit y, |
| TransformAccumulation accumulate = kFlattenTransform) { |
| Move(LayoutSize(x, y), accumulate); |
| } |
| |
| void Move(const LayoutSize&, TransformAccumulation = kFlattenTransform); |
| void Move(const IntSize& size, |
| TransformAccumulation accumulate = kFlattenTransform) { |
| Move(LayoutSize(size), accumulate); |
| } |
| void MoveBy(const LayoutPoint& point, |
| TransformAccumulation accumulate = kFlattenTransform) { |
| Move(LayoutSize(point.X(), point.Y()), accumulate); |
| } |
| void ApplyTransform(const AffineTransform& transform_from_container, |
| TransformAccumulation = kFlattenTransform, |
| bool* was_clamped = nullptr); |
| void ApplyTransform(const TransformationMatrix& transform_from_container, |
| TransformAccumulation = kFlattenTransform, |
| bool* was_clamped = nullptr); |
| void Flatten(bool* was_clamped = nullptr); |
| |
| // Return the coords of the point or quad in the last flattened layer |
| FloatPoint LastPlanarPoint() const { return last_planar_point_; } |
| FloatQuad LastPlanarQuad() const { return last_planar_quad_; } |
| |
| // Return the point or quad mapped through the current transform |
| FloatPoint MappedPoint(bool* was_clamped = nullptr) const; |
| FloatQuad MappedQuad(bool* was_clamped = nullptr) const; |
| |
| // Return the accumulated transform. |
| const TransformationMatrix& AccumulatedTransform() const; |
| |
| private: |
| void TranslateTransform(const LayoutSize&); |
| void TranslateMappedCoordinates(const LayoutSize&); |
| void FlattenWithTransform(const TransformationMatrix&, bool* was_clamped); |
| void ApplyAccumulatedOffset(); |
| |
| FloatPoint last_planar_point_; |
| FloatQuad last_planar_quad_; |
| |
| // We only allocate the transform if we need to |
| std::unique_ptr<TransformationMatrix> accumulated_transform_; |
| LayoutSize accumulated_offset_; |
| bool accumulating_transform_; |
| bool force_accumulating_transform_; |
| bool map_point_, map_quad_; |
| TransformDirection direction_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_TRANSFORMS_TRANSFORM_STATE_H_ |