| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #ifndef CLIPAREA_H |
| #define CLIPAREA_H |
| |
| #include "Matrix.h" |
| #include "Rect.h" |
| #include "utils/Pair.h" |
| |
| #include <SkRegion.h> |
| |
| namespace android { |
| namespace uirenderer { |
| |
| class LinearAllocator; |
| |
| Rect transformAndCalculateBounds(const Rect& r, const Matrix4& transform); |
| |
| class TransformedRectangle { |
| public: |
| TransformedRectangle(); |
| TransformedRectangle(const Rect& bounds, const Matrix4& transform); |
| |
| bool canSimplyIntersectWith(const TransformedRectangle& other) const; |
| void intersectWith(const TransformedRectangle& other); |
| |
| bool isEmpty() const; |
| |
| const Rect& getBounds() const { |
| return mBounds; |
| } |
| |
| Rect transformedBounds() const { |
| Rect transformedBounds(transformAndCalculateBounds(mBounds, mTransform)); |
| return transformedBounds; |
| } |
| |
| const Matrix4& getTransform() const { |
| return mTransform; |
| } |
| |
| void transform(const Matrix4& transform) { |
| Matrix4 t; |
| t.loadMultiply(transform, mTransform); |
| mTransform = t; |
| } |
| |
| private: |
| Rect mBounds; |
| Matrix4 mTransform; |
| }; |
| |
| class RectangleList { |
| public: |
| RectangleList(); |
| |
| bool isEmpty() const; |
| int getTransformedRectanglesCount() const; |
| const TransformedRectangle& getTransformedRectangle(int i) const; |
| |
| void setEmpty(); |
| void set(const Rect& bounds, const Matrix4& transform); |
| bool intersectWith(const Rect& bounds, const Matrix4& transform); |
| void transform(const Matrix4& transform); |
| |
| SkRegion convertToRegion(const SkRegion& clip) const; |
| Rect calculateBounds() const; |
| |
| enum { |
| kMaxTransformedRectangles = 5 |
| }; |
| |
| private: |
| int mTransformedRectanglesCount; |
| TransformedRectangle mTransformedRectangles[kMaxTransformedRectangles]; |
| }; |
| |
| enum class ClipMode { |
| Rectangle, |
| RectangleList, |
| |
| // region and path - intersected. if either is empty, don't use |
| Region |
| }; |
| |
| struct ClipBase { |
| ClipBase(ClipMode mode) |
| : mode(mode) {} |
| ClipBase(const Rect& rect) |
| : mode(ClipMode::Rectangle) |
| , rect(rect) {} |
| const ClipMode mode; |
| // Bounds of the clipping area, used to define the scissor, and define which |
| // portion of the stencil is updated/used |
| Rect rect; |
| }; |
| |
| struct ClipRect : ClipBase { |
| ClipRect(const Rect& rect) |
| : ClipBase(rect) {} |
| }; |
| |
| struct ClipRectList : ClipBase { |
| ClipRectList(const RectangleList& rectList) |
| : ClipBase(ClipMode::RectangleList) |
| , rectList(rectList) {} |
| RectangleList rectList; |
| }; |
| |
| struct ClipRegion : ClipBase { |
| ClipRegion(const SkRegion& region) |
| : ClipBase(ClipMode::Region) |
| , region(region) {} |
| ClipRegion() |
| : ClipBase(ClipMode::Region) {} |
| SkRegion region; |
| }; |
| |
| class ClipArea { |
| public: |
| ClipArea(); |
| |
| void setViewportDimensions(int width, int height); |
| |
| bool isEmpty() const { |
| return mClipRect.isEmpty(); |
| } |
| |
| void setEmpty(); |
| void setClip(float left, float top, float right, float bottom); |
| void clipRectWithTransform(const Rect& r, const mat4* transform, |
| SkRegion::Op op); |
| void clipRegion(const SkRegion& region, SkRegion::Op op); |
| void clipPathWithTransform(const SkPath& path, const mat4* transform, |
| SkRegion::Op op); |
| |
| const Rect& getClipRect() const { |
| return mClipRect; |
| } |
| |
| const SkRegion& getClipRegion() const { |
| return mClipRegion; |
| } |
| |
| const RectangleList& getRectangleList() const { |
| return mRectangleList; |
| } |
| |
| bool isRegion() const { |
| return ClipMode::Region == mMode; |
| } |
| |
| bool isSimple() const { |
| return mMode == ClipMode::Rectangle; |
| } |
| |
| bool isRectangleList() const { |
| return mMode == ClipMode::RectangleList; |
| } |
| |
| const ClipBase* serializeClip(LinearAllocator& allocator); |
| const ClipBase* serializeIntersectedClip(LinearAllocator& allocator, |
| const ClipBase* recordedClip, const Matrix4& recordedClipTransform); |
| void applyClip(const ClipBase* recordedClip, const Matrix4& recordedClipTransform); |
| |
| private: |
| void enterRectangleMode(); |
| void rectangleModeClipRectWithTransform(const Rect& r, const mat4* transform, SkRegion::Op op); |
| |
| void enterRectangleListMode(); |
| void rectangleListModeClipRectWithTransform(const Rect& r, |
| const mat4* transform, SkRegion::Op op); |
| |
| void enterRegionModeFromRectangleMode(); |
| void enterRegionModeFromRectangleListMode(); |
| void enterRegionMode(); |
| void regionModeClipRectWithTransform(const Rect& r, const mat4* transform, |
| SkRegion::Op op); |
| |
| void ensureClipRegion(); |
| void onClipRegionUpdated(); |
| |
| // Called by every state modifying public method. |
| void onClipUpdated() { |
| mPostViewportClipObserved = true; |
| mLastSerialization = nullptr; |
| mLastResolutionResult = nullptr; |
| } |
| |
| SkRegion createViewportRegion() { |
| return SkRegion(mViewportBounds.toSkIRect()); |
| } |
| |
| void regionFromPath(const SkPath& path, SkRegion& pathAsRegion) { |
| // TODO: this should not mask every path to the viewport - this makes it impossible to use |
| // paths to clip to larger areas (which is valid e.g. with SkRegion::kReplace_Op) |
| pathAsRegion.setPath(path, createViewportRegion()); |
| } |
| |
| ClipMode mMode; |
| bool mPostViewportClipObserved = false; |
| |
| /** |
| * If mLastSerialization is non-null, it represents an already serialized copy |
| * of the current clip state. If null, it has not been computed. |
| */ |
| const ClipBase* mLastSerialization = nullptr; |
| |
| /** |
| * This pair of pointers is a single entry cache of most recently seen |
| */ |
| const ClipBase* mLastResolutionResult = nullptr; |
| const ClipBase* mLastResolutionClip = nullptr; |
| Matrix4 mLastResolutionTransform; |
| |
| Rect mViewportBounds; |
| Rect mClipRect; |
| SkRegion mClipRegion; |
| RectangleList mRectangleList; |
| }; |
| |
| } /* namespace uirenderer */ |
| } /* namespace android */ |
| |
| #endif /* CLIPAREA_H_ */ |