The Tor Browser: gfx/skia/trunk/src/gpu/GrClipMaskCache.h@6474c204b198 (annotated)

gfx/skia/trunk/src/gpu/GrClipMaskCache.h@6474c204b198 (annotated)

gfx/skia/trunk/src/gpu/GrClipMaskCache.h

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
  * 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 "GrContext.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 : public SkNoncopyable {
 public:
     GrClipMaskCache();
     ~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.texture() &&
             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 NULL;
         }
         GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
         return back->fLastMask.texture();
     }
     const GrTexture* getLastMask() const {
         if (fStack.empty()) {
             SkASSERT(false);
             return NULL;
         }
         GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
         return back->fLastMask.texture();
     }
     void acquireMask(int32_t clipGenID,
                      const GrTextureDesc& desc,
                      const SkIRect& bound) {
         if (fStack.empty()) {
             SkASSERT(false);
             return;
         }
         GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
         back->acquireMask(fContext, clipGenID, desc, bound);
     }
     int getLastMaskWidth() const {
         if (fStack.empty()) {
             SkASSERT(false);
             return -1;
         }
         GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
         if (NULL == back->fLastMask.texture()) {
             return -1;
         }
         return back->fLastMask.texture()->width();
     }
     int getLastMaskHeight() const {
         if (fStack.empty()) {
             SkASSERT(false);
             return -1;
         }
         GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
         if (NULL == back->fLastMask.texture()) {
             return -1;
         }
         return back->fLastMask.texture()->height();
     }
     void getLastBound(SkIRect* bound) const {
         if (fStack.empty()) {
             SkASSERT(false);
             bound->setEmpty();
             return;
         }
         GrClipStackFrame* back = (GrClipStackFrame*) fStack.back();
         *bound = back->fLastBound;
     }
     void setContext(GrContext* context) {
         fContext = context;
     }
     GrContext* getContext() {
         return fContext;
     }
     void releaseResources() {
         SkDeque::F2BIter iter(fStack);
         for (GrClipStackFrame* frame = (GrClipStackFrame*) iter.next();
                 frame != NULL;
                 frame = (GrClipStackFrame*) iter.next()) {
             frame->reset();
         }
     }
 private:
     struct GrClipStackFrame {
         GrClipStackFrame() {
             this->reset();
         }
         void acquireMask(GrContext* context,
                          int32_t clipGenID,
                          const GrTextureDesc& desc,
                          const SkIRect& bound) {
             fLastClipGenID = clipGenID;
             fLastMask.set(context, desc);
             fLastBound = bound;
         }
         void reset () {
             fLastClipGenID = SkClipStack::kInvalidGenID;
             GrTextureDesc desc;
             fLastMask.set(NULL, desc);
             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.
         GrAutoScratchTexture    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;
     };
     GrContext*   fContext;
     SkDeque      fStack;
     typedef SkNoncopyable INHERITED;
 };
 #endif // GrClipMaskCache_DEFINED

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gfx/skia/trunk/src/gpu/GrClipMaskCache.h@6474c204b198 (annotated)

gfx/skia/trunk/src/gpu/GrClipMaskCache.h