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f1fc54c0cd
--HG-- rename : gfx/2d/DrawCommand.h => gfx/2d/DrawCommands.h extra : rebase_source : b4b2a4d8b73413c56dbaa55dc3bd200f126c060a
102 lines
2.6 KiB
C++
102 lines
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_gfx_2d_CaptureCommandList_h
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#define mozilla_gfx_2d_CaptureCommandList_h
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#include "mozilla/Move.h"
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#include "mozilla/PodOperations.h"
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#include <vector>
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#include "DrawCommand.h"
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namespace mozilla {
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namespace gfx {
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class CaptureCommandList
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{
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public:
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CaptureCommandList()
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: mLastCommand(nullptr)
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{}
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CaptureCommandList(CaptureCommandList&& aOther)
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: mStorage(Move(aOther.mStorage)), mLastCommand(aOther.mLastCommand)
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{
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aOther.mLastCommand = nullptr;
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}
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~CaptureCommandList();
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CaptureCommandList& operator =(CaptureCommandList&& aOther) {
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mStorage = Move(aOther.mStorage);
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mLastCommand = aOther.mLastCommand;
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aOther.mLastCommand = nullptr;
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return *this;
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}
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template <typename T>
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T* Append() {
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size_t oldSize = mStorage.size();
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mStorage.resize(mStorage.size() + sizeof(T) + sizeof(uint32_t));
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uint8_t* nextDrawLocation = &mStorage.front() + oldSize;
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*(uint32_t*)(nextDrawLocation) = sizeof(T) + sizeof(uint32_t);
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T* newCommand = reinterpret_cast<T*>(nextDrawLocation + sizeof(uint32_t));
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mLastCommand = newCommand;
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return newCommand;
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}
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template <typename T>
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T* ReuseOrAppend() {
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if (mLastCommand != nullptr &&
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mLastCommand->GetType() == T::Type) {
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return reinterpret_cast<T*>(mLastCommand);
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}
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return Append<T>();
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}
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class iterator
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{
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public:
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explicit iterator(CaptureCommandList& aParent)
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: mParent(aParent),
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mCurrent(nullptr),
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mEnd(nullptr)
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{
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if (!mParent.mStorage.empty()) {
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mCurrent = &mParent.mStorage.front();
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mEnd = mCurrent + mParent.mStorage.size();
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}
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}
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bool Done() const {
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return mCurrent >= mEnd;
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}
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void Next() {
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MOZ_ASSERT(!Done());
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mCurrent += *reinterpret_cast<uint32_t*>(mCurrent);
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}
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DrawingCommand* Get() {
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MOZ_ASSERT(!Done());
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return reinterpret_cast<DrawingCommand*>(mCurrent + sizeof(uint32_t));
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}
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private:
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CaptureCommandList& mParent;
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uint8_t* mCurrent;
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uint8_t* mEnd;
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};
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private:
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CaptureCommandList(const CaptureCommandList& aOther) = delete;
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void operator =(const CaptureCommandList& aOther) = delete;
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private:
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std::vector<uint8_t> mStorage;
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DrawingCommand* mLastCommand;
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};
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} // namespace gfx
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} // namespace mozilla
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#endif // mozilla_gfx_2d_CaptureCommandList_h
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