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

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

gfx/skia/trunk/src/gpu/GrAllocator.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 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef GrAllocator_DEFINED
 #define GrAllocator_DEFINED
 #include "GrConfig.h"
 #include "GrTypes.h"
 #include "SkTArray.h"
 #include "SkTypes.h"
 class GrAllocator : public SkNoncopyable {
 public:
     ~GrAllocator() {
         reset();
     }
     /**
      * Create an allocator
      *
      * @param   itemSize        the size of each item to allocate
      * @param   itemsPerBlock   the number of items to allocate at once
      * @param   initialBlock    optional memory to use for the first block.
      *                          Must be at least itemSize*itemsPerBlock sized.
      *                          Caller is responsible for freeing this memory.
      */
     GrAllocator(size_t itemSize, int itemsPerBlock, void* initialBlock) :
             fItemSize(itemSize),
             fItemsPerBlock(itemsPerBlock),
             fOwnFirstBlock(NULL == initialBlock),
             fCount(0) {
         SkASSERT(itemsPerBlock > 0);
         fBlockSize = fItemSize * fItemsPerBlock;
         fBlocks.push_back() = initialBlock;
         SkDEBUGCODE(if (!fOwnFirstBlock) {*((char*)initialBlock+fBlockSize-1)='a';} );
     }
     /*
      * Set first block of memory to write into.  Must be called before any other methods.
      * This requires that you have passed NULL in the constructor.
      *
      * @param   initialBlock    optional memory to use for the first block.
      *                          Must be at least itemSize*itemsPerBlock sized.
      *                          Caller is responsible for freeing this memory.
      */
     void setInitialBlock(void* initialBlock) {
         SkASSERT(0 == fCount);
         SkASSERT(1 == fBlocks.count());
         SkASSERT(NULL == fBlocks.back());
         fOwnFirstBlock = false;
         fBlocks.back() = initialBlock;
     }
     /**
      * Adds an item and returns pointer to it.
      *
      * @return pointer to the added item.
      */
     void* push_back() {
         int indexInBlock = fCount % fItemsPerBlock;
         // we always have at least one block
         if (0 == indexInBlock) {
             if (0 != fCount) {
                 fBlocks.push_back() = sk_malloc_throw(fBlockSize);
             } else if (fOwnFirstBlock) {
                 fBlocks[0] = sk_malloc_throw(fBlockSize);
             }
         }
         void* ret = (char*)fBlocks[fCount/fItemsPerBlock] +
                     fItemSize * indexInBlock;
         ++fCount;
         return ret;
     }
     /**
      * removes all added items
      */
     void reset() {
         int blockCount = GrMax((unsigned)1,
                                GrUIDivRoundUp(fCount, fItemsPerBlock));
         for (int i = 1; i < blockCount; ++i) {
             sk_free(fBlocks[i]);
         }
         if (fOwnFirstBlock) {
             sk_free(fBlocks[0]);
             fBlocks[0] = NULL;
         }
         fBlocks.pop_back_n(blockCount-1);
         fCount = 0;
     }
     /**
      * count of items
      */
     int count() const {
         return fCount;
     }
     /**
      * is the count 0
      */
     bool empty() const { return fCount == 0; }
     /**
      * access last item, only call if count() != 0
      */
     void* back() {
         SkASSERT(fCount);
         return (*this)[fCount-1];
     }
     /**
      * access last item, only call if count() != 0
      */
     const void* back() const {
         SkASSERT(fCount);
         return (*this)[fCount-1];
     }
     /**
      * access item by index.
      */
     void* operator[] (int i) {
         SkASSERT(i >= 0 && i < fCount);
         return (char*)fBlocks[i / fItemsPerBlock] +
                fItemSize * (i % fItemsPerBlock);
     }
     /**
      * access item by index.
      */
     const void* operator[] (int i) const {
         SkASSERT(i >= 0 && i < fCount);
         return (const char*)fBlocks[i / fItemsPerBlock] +
                fItemSize * (i % fItemsPerBlock);
     }
 private:
     static const int NUM_INIT_BLOCK_PTRS = 8;
     SkSTArray<NUM_INIT_BLOCK_PTRS, void*>   fBlocks;
     size_t                                  fBlockSize;
     size_t                                  fItemSize;
     int                                     fItemsPerBlock;
     bool                                    fOwnFirstBlock;
     int                                     fCount;
     typedef SkNoncopyable INHERITED;
 };
 template <typename T>
 class GrTAllocator : public SkNoncopyable {
 public:
     virtual ~GrTAllocator() { this->reset(); };
     /**
      * Create an allocator
      *
      * @param   itemsPerBlock   the number of items to allocate at once
      */
     explicit GrTAllocator(int itemsPerBlock)
         : fAllocator(sizeof(T), itemsPerBlock, NULL) {}
     /**
      * Adds an item and returns it.
      *
      * @return the added item.
      */
     T& push_back() {
         void* item = fAllocator.push_back();
         SkASSERT(NULL != item);
         SkNEW_PLACEMENT(item, T);
         return *(T*)item;
     }
     T& push_back(const T& t) {
         void* item = fAllocator.push_back();
         SkASSERT(NULL != item);
         SkNEW_PLACEMENT_ARGS(item, T, (t));
         return *(T*)item;
     }
     /**
      * removes all added items
      */
     void reset() {
         int c = fAllocator.count();
         for (int i = 0; i < c; ++i) {
             ((T*)fAllocator[i])->~T();
         }
         fAllocator.reset();
     }
     /**
      * count of items
      */
     int count() const {
         return fAllocator.count();
     }
     /**
      * is the count 0
      */
     bool empty() const { return fAllocator.empty(); }
     /**
      * access last item, only call if count() != 0
      */
     T& back() {
         return *(T*)fAllocator.back();
     }
     /**
      * access last item, only call if count() != 0
      */
     const T& back() const {
         return *(const T*)fAllocator.back();
     }
     /**
      * access item by index.
      */
     T& operator[] (int i) {
         return *(T*)(fAllocator[i]);
     }
     /**
      * access item by index.
      */
     const T& operator[] (int i) const {
         return *(const T*)(fAllocator[i]);
     }
 protected:
     /*
      * Set first block of memory to write into.  Must be called before any other methods.
      *
      * @param   initialBlock    optional memory to use for the first block.
      *                          Must be at least size(T)*itemsPerBlock sized.
      *                          Caller is responsible for freeing this memory.
      */
     void setInitialBlock(void* initialBlock) {
         fAllocator.setInitialBlock(initialBlock);
     }
 private:
     GrAllocator fAllocator;
     typedef SkNoncopyable INHERITED;
 };
 template <int N, typename T> class GrSTAllocator : public GrTAllocator<T> {
 private:
     typedef GrTAllocator<T> INHERITED;
 public:
     GrSTAllocator() : INHERITED(N) {
         this->setInitialBlock(fStorage.get());
     }
 private:
     SkAlignedSTStorage<N, T> fStorage;
 };
 #endif

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

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