/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef GrAppliedClip_DEFINED
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#define GrAppliedClip_DEFINED
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#include "GrFragmentProcessor.h"
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#include "GrScissorState.h"
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#include "GrWindowRectsState.h"
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#include "SkClipStack.h"
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/**
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* Produced by GrHardClip. It provides a set of modifications to the hardware drawing state that
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* implement the clip.
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*/
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class GrAppliedHardClip {
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public:
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GrAppliedHardClip() = default;
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GrAppliedHardClip(GrAppliedHardClip&& that) = default;
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GrAppliedHardClip(const GrAppliedHardClip&) = delete;
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const GrScissorState& scissorState() const { return fScissorState; }
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const GrWindowRectsState& windowRectsState() const { return fWindowRectsState; }
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uint32_t stencilStackID() const { return fStencilStackID; }
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bool hasStencilClip() const { return SkClipStack::kInvalidGenID != fStencilStackID; }
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/**
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* Intersects the applied clip with the provided rect. Returns false if the draw became empty.
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* 'clippedDrawBounds' will be intersected with 'irect'. This returns false if the clip becomes
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* empty or the draw no longer intersects the clip. In either case the draw can be skipped.
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*/
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bool addScissor(const SkIRect& irect, SkRect* clippedDrawBounds) {
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return fScissorState.intersect(irect) && clippedDrawBounds->intersect(SkRect::Make(irect));
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}
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void addWindowRectangles(const GrWindowRectsState& windowState) {
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SkASSERT(!fWindowRectsState.enabled());
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fWindowRectsState = windowState;
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}
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void addWindowRectangles(const GrWindowRectangles& windows, GrWindowRectsState::Mode mode) {
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SkASSERT(!fWindowRectsState.enabled());
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fWindowRectsState.set(windows, mode);
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}
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void addStencilClip(uint32_t stencilStackID) {
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SkASSERT(SkClipStack::kInvalidGenID == fStencilStackID);
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fStencilStackID = stencilStackID;
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}
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bool doesClip() const {
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return fScissorState.enabled() || this->hasStencilClip() || fWindowRectsState.enabled();
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}
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bool operator==(const GrAppliedHardClip& that) const {
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return fScissorState == that.fScissorState &&
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fWindowRectsState == that.fWindowRectsState &&
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fStencilStackID == that.fStencilStackID;
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}
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bool operator!=(const GrAppliedHardClip& that) const { return !(*this == that); }
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private:
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GrScissorState fScissorState;
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GrWindowRectsState fWindowRectsState;
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uint32_t fStencilStackID = SkClipStack::kInvalidGenID;
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};
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/**
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* Produced by GrClip. It provides a set of modifications to GrPipeline that implement the clip.
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*/
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class GrAppliedClip {
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public:
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GrAppliedClip() = default;
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GrAppliedClip(GrAppliedClip&& that) = default;
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GrAppliedClip(const GrAppliedClip&) = delete;
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const GrScissorState& scissorState() const { return fHardClip.scissorState(); }
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const GrWindowRectsState& windowRectsState() const { return fHardClip.windowRectsState(); }
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uint32_t stencilStackID() const { return fHardClip.stencilStackID(); }
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bool hasStencilClip() const { return fHardClip.hasStencilClip(); }
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int numClipCoverageFragmentProcessors() const { return fClipCoverageFPs.count(); }
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const GrFragmentProcessor* clipCoverageFragmentProcessor(int i) const {
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SkASSERT(fClipCoverageFPs[i]);
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return fClipCoverageFPs[i].get();
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}
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std::unique_ptr<const GrFragmentProcessor> detachClipCoverageFragmentProcessor(int i) {
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SkASSERT(fClipCoverageFPs[i]);
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return std::move(fClipCoverageFPs[i]);
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}
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GrAppliedHardClip& hardClip() { return fHardClip; }
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void addCoverageFP(std::unique_ptr<GrFragmentProcessor> fp) {
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SkASSERT(fp);
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fClipCoverageFPs.push_back(std::move(fp));
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}
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bool doesClip() const {
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return fHardClip.doesClip() || !fClipCoverageFPs.empty();
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}
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bool operator==(const GrAppliedClip& that) const {
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if (fHardClip != that.fHardClip ||
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fClipCoverageFPs.count() != that.fClipCoverageFPs.count()) {
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return false;
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}
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for (int i = 0; i < fClipCoverageFPs.count(); ++i) {
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if (!fClipCoverageFPs[i] || !that.fClipCoverageFPs[i]) {
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if (fClipCoverageFPs[i] == that.fClipCoverageFPs[i]) {
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continue; // Both are null.
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}
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return false;
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}
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if (!fClipCoverageFPs[i]->isEqual(*that.fClipCoverageFPs[i])) {
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return false;
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}
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}
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return true;
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}
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bool operator!=(const GrAppliedClip& that) const { return !(*this == that); }
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void visitProxies(const std::function<void(GrSurfaceProxy*)>& func) const {
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for (const std::unique_ptr<GrFragmentProcessor>& fp : fClipCoverageFPs) {
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if (fp) { // This might be called after detach.
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fp->visitProxies(func);
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}
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}
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}
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private:
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GrAppliedHardClip fHardClip;
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SkSTArray<4, std::unique_ptr<GrFragmentProcessor>> fClipCoverageFPs;
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};
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#endif
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