| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef GrReducedClip_DEFINED |
| #define GrReducedClip_DEFINED |
| |
| #include "GrWindowRectangles.h" |
| #include "SkClipStack.h" |
| #include "SkTLList.h" |
| |
| class GrContext; |
| class GrRenderTargetContext; |
| |
| /** |
| * This class takes a clip stack and produces a reduced set of elements that are equivalent to |
| * applying that full stack within a specified query rectangle. |
| */ |
| class SK_API GrReducedClip { |
| public: |
| GrReducedClip(const SkClipStack&, const SkRect& queryBounds, int maxWindowRectangles = 0); |
| |
| /** |
| * If hasIBounds() is true, this is the bounding box within which the clip elements are valid. |
| * The caller must not modify any pixels outside this box. Undefined if hasIBounds() is false. |
| */ |
| const SkIRect& ibounds() const { SkASSERT(fHasIBounds); return fIBounds; } |
| int left() const { return this->ibounds().left(); } |
| int top() const { return this->ibounds().top(); } |
| int width() const { return this->ibounds().width(); } |
| int height() const { return this->ibounds().height(); } |
| |
| /** |
| * Indicates whether ibounds() are defined. They will always be defined if the elements() are |
| * nonempty. |
| */ |
| bool hasIBounds() const { return fHasIBounds; } |
| |
| /** |
| * If nonempty, this is a set of "exclusive" windows within which the clip elements are NOT |
| * valid. The caller must not modify any pixels inside these windows. |
| */ |
| const GrWindowRectangles& windowRectangles() const { return fWindowRects; } |
| |
| typedef SkTLList<SkClipStack::Element, 16> ElementList; |
| |
| /** |
| * Populated with a minimal list of elements required to fully implement the clip. |
| */ |
| const ElementList& elements() const { return fElements; } |
| |
| /** |
| * If elements() are nonempty, uniquely identifies the list of elements within ibounds(). |
| * Otherwise undefined. |
| */ |
| uint32_t elementsGenID() const { SkASSERT(!fElements.isEmpty()); return fElementsGenID; } |
| |
| /** |
| * Indicates whether antialiasing is required to process any of the clip elements. |
| */ |
| bool requiresAA() const { return fRequiresAA; } |
| |
| enum class InitialState : bool { |
| kAllIn, |
| kAllOut |
| }; |
| |
| InitialState initialState() const { return fInitialState; } |
| |
| bool drawAlphaClipMask(GrRenderTargetContext*) const; |
| bool drawStencilClipMask(GrContext*, GrRenderTargetContext*) const; |
| |
| private: |
| void walkStack(const SkClipStack&, const SkRect& queryBounds, int maxWindowRectangles); |
| void addInteriorWindowRectangles(int maxWindowRectangles); |
| void addWindowRectangle(const SkRect& elementInteriorRect, bool elementIsAA); |
| bool intersectIBounds(const SkIRect&); |
| |
| SkIRect fIBounds; |
| bool fHasIBounds; |
| GrWindowRectangles fWindowRects; |
| ElementList fElements; |
| uint32_t fElementsGenID; |
| bool fRequiresAA; |
| InitialState fInitialState; |
| }; |
| |
| #endif |