1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/core/SkTRegistry.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,55 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2009 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#ifndef SkTRegistry_DEFINED
1.14 +#define SkTRegistry_DEFINED
1.15 +
1.16 +#include "SkTypes.h"
1.17 +
1.18 +/** Template class that registers itself (in the constructor) into a linked-list
1.19 + and provides a function-pointer. This can be used to auto-register a set of
1.20 + services, e.g. a set of image codecs.
1.21 + */
1.22 +template <typename T> class SkTRegistry : SkNoncopyable {
1.23 +public:
1.24 + typedef T Factory;
1.25 +
1.26 + explicit SkTRegistry(T fact) : fFact(fact) {
1.27 +#ifdef SK_BUILD_FOR_ANDROID
1.28 + // work-around for double-initialization bug
1.29 + {
1.30 + SkTRegistry* reg = gHead;
1.31 + while (reg) {
1.32 + if (reg == this) {
1.33 + return;
1.34 + }
1.35 + reg = reg->fChain;
1.36 + }
1.37 + }
1.38 +#endif
1.39 + fChain = gHead;
1.40 + gHead = this;
1.41 + }
1.42 +
1.43 + static const SkTRegistry* Head() { return gHead; }
1.44 +
1.45 + const SkTRegistry* next() const { return fChain; }
1.46 + const Factory& factory() const { return fFact; }
1.47 +
1.48 +private:
1.49 + Factory fFact;
1.50 + SkTRegistry* fChain;
1.51 +
1.52 + static SkTRegistry* gHead;
1.53 +};
1.54 +
1.55 +// The caller still needs to declare an instance of this somewhere
1.56 +template <typename T> SkTRegistry<T>* SkTRegistry<T>::gHead;
1.57 +
1.58 +#endif
