зеркало из https://github.com/mozilla/gecko-dev.git
132 строки
3.6 KiB
C++
132 строки
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 <limits>
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#include "DrawCommand.h"
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#include "Logging.h"
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namespace mozilla {
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namespace gfx {
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class CaptureCommandList {
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public:
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CaptureCommandList() : mLastCommand(nullptr) {}
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CaptureCommandList(CaptureCommandList&& aOther)
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: mStorage(std::move(aOther.mStorage)),
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mLastCommand(aOther.mLastCommand) {
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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 = std::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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static_assert(sizeof(T) + sizeof(uint16_t) + sizeof(uint16_t) <=
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std::numeric_limits<uint16_t>::max(),
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"encoding is too small to contain advance");
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const uint16_t kAdvance = sizeof(T) + sizeof(uint16_t) + sizeof(uint16_t);
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size_t size = mStorage.size();
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mStorage.resize(size + kAdvance);
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uint8_t* current = &mStorage.front() + size;
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*(uint16_t*)(current) = kAdvance;
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current += sizeof(uint16_t);
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*(uint16_t*)(current) = ~kAdvance;
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current += sizeof(uint16_t);
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T* command = reinterpret_cast<T*>(current);
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mLastCommand = command;
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return command;
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}
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template <typename T>
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T* ReuseOrAppend() {
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{ // Scope lock
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if (mLastCommand != nullptr && mLastCommand->GetType() == T::Type) {
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return reinterpret_cast<T*>(mLastCommand);
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}
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}
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return Append<T>();
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}
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bool IsEmpty() const { return mStorage.empty(); }
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template <typename T>
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bool BufferWillAlloc() const {
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const uint16_t kAdvance = sizeof(T) + sizeof(uint16_t) + sizeof(uint16_t);
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return mStorage.size() + kAdvance > mStorage.capacity();
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}
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size_t BufferCapacity() const { return mStorage.capacity(); }
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void Clear();
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class iterator {
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public:
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explicit iterator(CaptureCommandList& aParent)
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: mParent(aParent), mCurrent(nullptr), mEnd(nullptr) {
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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 { return mCurrent >= mEnd; }
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void Next() {
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MOZ_ASSERT(!Done());
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uint16_t advance = *reinterpret_cast<uint16_t*>(mCurrent);
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uint16_t redundant =
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~*reinterpret_cast<uint16_t*>(mCurrent + sizeof(uint16_t));
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MOZ_RELEASE_ASSERT(advance == redundant);
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mCurrent += advance;
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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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void Log(TreeLog<>& aStream) {
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for (iterator iter(*this); !iter.Done(); iter.Next()) {
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DrawingCommand* cmd = iter.Get();
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cmd->Log(aStream);
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aStream << "\n";
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}
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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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