| /* |
| * 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 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 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 TransformState_h |
| #define TransformState_h |
| |
| #include "AffineTransform.h" |
| #include "FloatPoint.h" |
| #include "FloatQuad.h" |
| #include "LayoutSize.h" |
| #include "TransformationMatrix.h" |
| |
| namespace WebCore { |
| |
| class TransformState { |
| public: |
| enum TransformDirection { ApplyTransformDirection, UnapplyInverseTransformDirection }; |
| enum TransformAccumulation { FlattenTransform, AccumulateTransform }; |
| |
| TransformState(TransformDirection mappingDirection, const FloatPoint& p, const FloatQuad& quad) |
| : m_lastPlanarPoint(p) |
| , m_lastPlanarQuad(quad) |
| , m_accumulatingTransform(false) |
| , m_mapPoint(true) |
| , m_mapQuad(true) |
| , m_direction(mappingDirection) |
| { |
| } |
| |
| TransformState(TransformDirection mappingDirection, const FloatPoint& p) |
| : m_lastPlanarPoint(p) |
| , m_accumulatingTransform(false) |
| , m_mapPoint(true) |
| , m_mapQuad(false) |
| , m_direction(mappingDirection) |
| { |
| } |
| |
| TransformState(TransformDirection mappingDirection, const FloatQuad& quad) |
| : m_lastPlanarQuad(quad) |
| , m_accumulatingTransform(false) |
| , m_mapPoint(false) |
| , m_mapQuad(true) |
| , m_direction(mappingDirection) |
| { |
| } |
| |
| TransformState(const TransformState& other) { *this = other; } |
| |
| TransformState& operator=(const TransformState&); |
| |
| void setQuad(const FloatQuad& quad) |
| { |
| // We must be in a flattened state (no accumulated offset) when setting this quad. |
| ASSERT(m_accumulatedOffset == LayoutSize()); |
| m_lastPlanarQuad = quad; |
| } |
| |
| // FIXME: webkit.org/b/144226 use Optional<FloatQuad>. |
| void setSecondaryQuad(const FloatQuad* quad) |
| { |
| // We must be in a flattened state (no accumulated offset) when setting this secondary quad. |
| ASSERT(m_accumulatedOffset == LayoutSize()); |
| if (quad) |
| m_lastPlanarSecondaryQuad = makeUnique<FloatQuad>(*quad); |
| else |
| m_lastPlanarSecondaryQuad = nullptr; |
| } |
| |
| // FIXME: webkit.org/b/144226 use Optional<FloatQuad>. |
| void setLastPlanarSecondaryQuad(const FloatQuad*); |
| |
| void move(LayoutUnit x, LayoutUnit y, TransformAccumulation accumulate = FlattenTransform) |
| { |
| move(LayoutSize(x, y), accumulate); |
| } |
| |
| void move(const LayoutSize&, TransformAccumulation = FlattenTransform); |
| void applyTransform(const AffineTransform& transformFromContainer, TransformAccumulation = FlattenTransform, bool* wasClamped = nullptr); |
| void applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation = FlattenTransform, bool* wasClamped = nullptr); |
| void flatten(bool* wasClamped = nullptr); |
| |
| // Return the coords of the point or quad in the last flattened layer |
| FloatPoint lastPlanarPoint() const { return m_lastPlanarPoint; } |
| FloatQuad lastPlanarQuad() const { return m_lastPlanarQuad; } |
| FloatQuad* lastPlanarSecondaryQuad() const { return m_lastPlanarSecondaryQuad.get(); } |
| bool isMappingSecondaryQuad() const { return m_lastPlanarSecondaryQuad.get(); } |
| |
| // Return the point or quad mapped through the current transform |
| FloatPoint mappedPoint(bool* wasClamped = nullptr) const; |
| FloatQuad mappedQuad(bool* wasClamped = nullptr) const; |
| Optional<FloatQuad> mappedSecondaryQuad(bool* wasClamped = nullptr) const; |
| |
| private: |
| void translateTransform(const LayoutSize&); |
| void translateMappedCoordinates(const LayoutSize&); |
| void flattenWithTransform(const TransformationMatrix&, bool* wasClamped); |
| void applyAccumulatedOffset(); |
| |
| TransformDirection direction() const { return m_direction; } |
| TransformDirection inverseDirection() const; |
| |
| void mapQuad(FloatQuad&, TransformDirection, bool* clamped = nullptr) const; |
| |
| FloatPoint m_lastPlanarPoint; |
| FloatQuad m_lastPlanarQuad; |
| std::unique_ptr<FloatQuad> m_lastPlanarSecondaryQuad; // Optional second quad to map. |
| |
| // We only allocate the transform if we need to |
| std::unique_ptr<TransformationMatrix> m_accumulatedTransform; |
| LayoutSize m_accumulatedOffset; |
| bool m_accumulatingTransform; |
| bool m_mapPoint; |
| bool m_mapQuad; |
| TransformDirection m_direction; |
| }; |
| |
| inline TransformState::TransformDirection TransformState::inverseDirection() const |
| { |
| return m_direction == ApplyTransformDirection ? UnapplyInverseTransformDirection : ApplyTransformDirection; |
| } |
| |
| } // namespace WebCore |
| |
| #endif // TransformState_h |