The Tor Browser / file comparison
comparison: content/canvas/src/WebGLElementArrayCache.h
content/canvas/src/WebGLElementArrayCache.h
- branch
- TOR_BUG_9701
- changeset 11
- deefc01c0e14
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| -1:000000000000 | 0:9dce57823359 |
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| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef WEBGLELEMENTARRAYCACHE_H | |
| 7 #define WEBGLELEMENTARRAYCACHE_H | |
| 8 | |
| 9 #include "mozilla/MemoryReporting.h" | |
| 10 #include <stdint.h> | |
| 11 #include "nscore.h" | |
| 12 #include "GLDefs.h" | |
| 13 | |
| 14 namespace mozilla { | |
| 15 | |
| 16 template<typename T> | |
| 17 struct WebGLElementArrayCacheTree; | |
| 18 | |
| 19 /* | |
| 20 * WebGLElementArrayCache implements WebGL element array buffer validation for drawElements. | |
| 21 * | |
| 22 * Its exposes methods meant to be called by WebGL method implementations: | |
| 23 * - Validate, to be called by WebGLContext::DrawElements, is where we use the cache | |
| 24 * - BufferData and BufferSubData, to be called by eponymous WebGL methods, are how | |
| 25 * data is fed into the cache | |
| 26 * | |
| 27 * Most of the implementation is hidden in the auxilary class template, WebGLElementArrayCacheTree. | |
| 28 * Refer to its code for design comments. | |
| 29 */ | |
| 30 class WebGLElementArrayCache { | |
| 31 | |
| 32 public: | |
| 33 bool BufferData(const void* ptr, size_t byteSize); | |
| 34 void BufferSubData(size_t pos, const void* ptr, size_t updateByteSize); | |
| 35 | |
| 36 bool Validate(GLenum type, uint32_t maxAllowed, size_t first, size_t count, | |
| 37 uint32_t* out_upperBound = nullptr); | |
| 38 | |
| 39 template<typename T> | |
| 40 T Element(size_t i) const { return Elements<T>()[i]; } | |
| 41 | |
| 42 WebGLElementArrayCache() | |
| 43 : mUntypedData(nullptr) | |
| 44 , mByteSize(0) | |
| 45 , mUint8Tree(nullptr) | |
| 46 , mUint16Tree(nullptr) | |
| 47 , mUint32Tree(nullptr) | |
| 48 {} | |
| 49 | |
| 50 ~WebGLElementArrayCache(); | |
| 51 | |
| 52 size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; | |
| 53 | |
| 54 private: | |
| 55 | |
| 56 template<typename T> | |
| 57 bool Validate(uint32_t maxAllowed, size_t first, size_t count, | |
| 58 uint32_t* out_upperBound); | |
| 59 | |
| 60 size_t ByteSize() const { | |
| 61 return mByteSize; | |
| 62 } | |
| 63 | |
| 64 template<typename T> | |
| 65 const T* Elements() const { return static_cast<const T*>(mUntypedData); } | |
| 66 template<typename T> | |
| 67 T* Elements() { return static_cast<T*>(mUntypedData); } | |
| 68 | |
| 69 void InvalidateTrees(size_t firstByte, size_t lastByte); | |
| 70 | |
| 71 template<typename T> | |
| 72 friend struct WebGLElementArrayCacheTree; | |
| 73 template<typename T> | |
| 74 friend struct TreeForType; | |
| 75 | |
| 76 void* mUntypedData; | |
| 77 size_t mByteSize; | |
| 78 WebGLElementArrayCacheTree<uint8_t>* mUint8Tree; | |
| 79 WebGLElementArrayCacheTree<uint16_t>* mUint16Tree; | |
| 80 WebGLElementArrayCacheTree<uint32_t>* mUint32Tree; | |
| 81 }; | |
| 82 | |
| 83 | |
| 84 } // end namespace mozilla | |
| 85 | |
| 86 #endif // WEBGLELEMENTARRAYCACHE_H |
