Remove separate cache for clip mask textures

src/gpu/GrClipMaskCache.h

-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef GrClipMaskCache_DEFINED
-#define GrClipMaskCache_DEFINED
-
-#include "GrResourceProvider.h"
-#include "SkClipStack.h"
-#include "SkTypes.h"
-
-class GrTexture;
-
-/**
- * The stencil buffer stores the last clip path - providing a single entry
- * "cache". This class provides similar functionality for AA clip paths
- */
-class GrClipMaskCache : SkNoncopyable {
-public:
-    GrClipMaskCache(GrResourceProvider*);
-
-    ~GrClipMaskCache() {
-        while (!fStack.empty()) {
-            GrClipStackFrame* temp = (GrClipStackFrame*) fStack.back();
-            temp->~GrClipStackFrame();
-            fStack.pop_back();
-        }
-    }
-
-    bool canReuse(int32_t clipGenID, const SkIRect& bounds) {
-
-        SkASSERT(clipGenID != SkClipStack::kWideOpenGenID);
-        SkASSERT(clipGenID != SkClipStack::kEmptyGenID);
-
-        GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
-
-        // We could reuse the mask if bounds is a subset of last bounds. We'd have to communicate
-        // an offset to the caller.
-        if (back->fLastMask &&
-            !back->fLastMask->wasDestroyed() &&
-            back->fLastBound == bounds &&
-            back->fLastClipGenID == clipGenID) {
-            return true;
-        }
-
-        return false;
-    }
-
-    void reset() {
-        if (fStack.empty()) {
-//            SkASSERT(false);
-            return;
-        }
-
-        GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
-
-        back->reset();
-    }
-
-    /**
-     * After a "push" the clip state is entirely open. Currently, the
-     * entire clip stack will be re-rendered into a new clip mask.
-     * TODO: can we take advantage of the nested nature of the clips to
-     * reduce the mask creation cost?
-     */
-    void push();
-
-    void pop() {
-        //SkASSERT(!fStack.empty());
-
-        if (!fStack.empty()) {
-            GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
-
-            back->~GrClipStackFrame();
-            fStack.pop_back();
-        }
-    }
-
-    int32_t getLastClipGenID() const {
-
-        if (fStack.empty()) {
-            return SkClipStack::kInvalidGenID;
-        }
-
-        return ((GrClipStackFrame*) fStack.back())->fLastClipGenID;
-    }
-
-    GrTexture* getLastMask() {
-
-        if (fStack.empty()) {
-            SkASSERT(false);
-            return nullptr;
-        }
-
-        GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
-
-        return back->fLastMask;
-    }
-
-    const GrTexture* getLastMask() const {
-
-        if (fStack.empty()) {
-            SkASSERT(false);
-            return nullptr;
-        }
-
-        GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
-
-        return back->fLastMask;
-    }
-
-    void acquireMask(int32_t clipGenID,
-                     const GrSurfaceDesc& desc,
-                     const SkIRect& bound) {
-
-        if (fStack.empty()) {
-            SkASSERT(false);
-            return;
-        }
-
-        GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
-
-        back->acquireMask(fResourceProvider, clipGenID, desc, bound);
-    }
-
-    int getLastMaskWidth() const {
-
-        if (fStack.empty()) {
-            SkASSERT(false);
-            return -1;
-        }
-
-        GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
-
-        if (nullptr == back->fLastMask) {
-            return -1;
-        }
-
-        return back->fLastMask->width();
-    }
-
-    int getLastMaskHeight() const {
-
-        if (fStack.empty()) {
-            SkASSERT(false);
-            return -1;
-        }
-
-        GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
-
-        if (nullptr == back->fLastMask) {
-            return -1;
-        }
-
-        return back->fLastMask->height();
-    }
-
-    void getLastBound(SkIRect* bound) const {
-
-        if (fStack.empty()) {
-            SkASSERT(false);
-            bound->setEmpty();
-            return;
-        }
-
-        GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
-
-        *bound = back->fLastBound;
-    }
-
-    //  TODO: Remove this when we hold cache keys instead of refs to textures.
-    void purgeResources() {
-        SkDeque::F2BIter iter(fStack);
-        for (GrClipStackFrame* frame = (GrClipStackFrame*) iter.next();
-                frame != nullptr;
-                frame = (GrClipStackFrame*) iter.next()) {
-            frame->reset();
-        }
-    }
-
-private:
-    struct GrClipStackFrame {
-
-        GrClipStackFrame() {
-            this->reset();
-        }
-
-        void acquireMask(GrResourceProvider* resourceProvider,
-                         int32_t clipGenID,
-                         const GrSurfaceDesc& desc,
-                         const SkIRect& bound) {
-
-            fLastClipGenID = clipGenID;
-
-            // TODO: Determine if we really need the NoPendingIO flag anymore.
-            // (http://skbug.com/4156)
-            static const uint32_t kFlags = GrResourceProvider::kNoPendingIO_Flag;
-            fLastMask.reset(resourceProvider->createApproxTexture(desc, kFlags));
-
-            fLastBound = bound;
-        }
-
-        void reset () {
-            fLastClipGenID = SkClipStack::kInvalidGenID;
-
-            GrSurfaceDesc desc;
-
-            fLastMask.reset(nullptr);
-            fLastBound.setEmpty();
-        }
-
-        int32_t                 fLastClipGenID;
-        // The mask's width & height values are used by GrClipMaskManager to correctly scale the
-        // texture coords for the geometry drawn with this mask. TODO: This should be a cache key
-        // and not a hard ref to a texture.
-        SkAutoTUnref<GrTexture> fLastMask;
-        // fLastBound stores the bounding box of the clip mask in clip-stack space. This rect is
-        // used by GrClipMaskManager to position a rect and compute texture coords for the mask.
-        SkIRect                 fLastBound;
-    };
-
-    SkDeque             fStack;
-    GrResourceProvider* fResourceProvider;
-
-    typedef SkNoncopyable INHERITED;
-};
-
-#endif // GrClipMaskCache_DEFINED