mirror of
https://github.com/juce-framework/JUCE.git
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725 lines
23 KiB
C++
725 lines
23 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE framework.
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Copyright (c) Raw Material Software Limited
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JUCE is an open source framework subject to commercial or open source
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licensing.
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By downloading, installing, or using the JUCE framework, or combining the
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JUCE framework with any other source code, object code, content or any other
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copyrightable work, you agree to the terms of the JUCE End User Licence
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Agreement, and all incorporated terms including the JUCE Privacy Policy and
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the JUCE Website Terms of Service, as applicable, which will bind you. If you
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do not agree to the terms of these agreements, we will not license the JUCE
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framework to you, and you must discontinue the installation or download
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process and cease use of the JUCE framework.
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JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
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JUCE Privacy Policy: https://juce.com/juce-privacy-policy
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JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
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Or:
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You may also use this code under the terms of the AGPLv3:
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https://www.gnu.org/licenses/agpl-3.0.en.html
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THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
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WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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class Presentation
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{
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public:
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auto getPresentationBitmap() const
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{
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jassert (presentationBitmap != nullptr);
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return presentationBitmap;
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}
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auto getPresentationBitmap (const Rectangle<int>& swapSize, ComSmartPtr<ID2D1DeviceContext1> context)
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{
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if (presentationBitmap != nullptr)
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{
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const auto size = presentationBitmap->GetPixelSize();
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if (size.width != (uint32) swapSize.getWidth() || size.height != (uint32) swapSize.getHeight())
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presentationBitmap = nullptr;
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}
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if (presentationBitmap == nullptr)
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{
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presentationBitmap = Direct2DBitmap::createBitmap (context,
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Image::ARGB,
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{ (uint32) swapSize.getWidth(), (uint32) swapSize.getHeight() },
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D2D1_BITMAP_OPTIONS_TARGET);
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}
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return presentationBitmap;
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}
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void setPaintAreas (RectangleList<int> areas)
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{
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paintAreas = std::move (areas);
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}
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const RectangleList<int>& getPaintAreas() const
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{
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return paintAreas;
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}
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private:
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ComSmartPtr<ID2D1Bitmap> presentationBitmap;
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RectangleList<int> paintAreas;
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};
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class PresentationQueue
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{
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public:
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Presentation* lockFront()
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{
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const std::scoped_lock lock { mutex };
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displaying = std::exchange (readyToDisplay, nullptr);
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return displaying;
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}
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void unlockFront()
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{
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const std::scoped_lock lock { mutex };
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displaying = nullptr;
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}
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Presentation* lockBack()
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{
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const std::scoped_lock lock { mutex };
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preparing = [&]() -> Presentation*
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{
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for (auto& p : presentations)
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if (&p != displaying && &p != readyToDisplay)
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return &p;
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return nullptr;
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}();
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return preparing;
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}
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void unlockBack()
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{
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{
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const std::scoped_lock lock { mutex };
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if (preparing == nullptr)
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return;
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if (readyToDisplay != nullptr)
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{
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// Copy the dirty regions from the newest presentation over the top of the 'ready'
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// presentation, then combine dirty regions.
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// We're effectively combining several frames of dirty regions into one, until
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// the screen update catches up.
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for (const auto& area : preparing->getPaintAreas())
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{
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const auto destPoint = D2DUtilities::toPOINT_2U (area.getPosition());
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const auto sourceRect = D2DUtilities::toRECT_U (area);
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readyToDisplay->getPresentationBitmap()->CopyFromBitmap (&destPoint, preparing->getPresentationBitmap(), &sourceRect);
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}
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auto areas = readyToDisplay->getPaintAreas();
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areas.add (preparing->getPaintAreas());
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readyToDisplay->setPaintAreas (std::move (areas));
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}
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else
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{
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readyToDisplay = std::exchange (preparing, nullptr);
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}
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}
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SetEvent (wakeEvent.getHandle());
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}
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HANDLE getWakeEvent() const
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{
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return wakeEvent.getHandle();
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}
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private:
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WindowsScopedEvent wakeEvent;
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std::mutex mutex;
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std::array<Presentation, 2> presentations;
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Presentation* preparing = nullptr;
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Presentation* readyToDisplay = nullptr;
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Presentation* displaying = nullptr;
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};
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template <auto lock, auto unlock>
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class PresentationQueueLock
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{
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public:
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PresentationQueueLock() = default;
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explicit PresentationQueueLock (PresentationQueue& q)
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: queue (&q),
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presentation (queue != nullptr ? (queue->*lock)() : nullptr)
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{
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}
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~PresentationQueueLock()
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{
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if (queue != nullptr)
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(queue->*unlock)();
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}
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PresentationQueueLock (PresentationQueueLock&& other) noexcept
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: queue (std::exchange (other.queue, nullptr)),
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presentation (std::exchange (other.presentation, nullptr))
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{
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}
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PresentationQueueLock& operator= (PresentationQueueLock&& other) noexcept
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{
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PresentationQueueLock { std::move (other) }.swap (*this);
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return *this;
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}
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PresentationQueueLock (const PresentationQueueLock&) = delete;
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PresentationQueueLock& operator= (const PresentationQueueLock&) = delete;
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Presentation* getPresentation() const { return presentation; }
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private:
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void swap (PresentationQueueLock& other) noexcept
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{
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std::swap (other.queue, queue);
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std::swap (other.presentation, presentation);
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}
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PresentationQueue* queue = nullptr;
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Presentation* presentation = nullptr;
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};
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using BackBufferLock = PresentationQueueLock<&PresentationQueue::lockBack, &PresentationQueue::unlockBack>;
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using FrontBufferLock = PresentationQueueLock<&PresentationQueue::lockFront, &PresentationQueue::unlockFront>;
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struct Direct2DHwndContext::HwndPimpl : public Direct2DGraphicsContext::Pimpl
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{
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private:
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struct SwapChainThread
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{
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SwapChainThread (Direct2DHwndContext::HwndPimpl& ownerIn,
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ComSmartPtr<ID2D1Multithread> multithreadIn)
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: owner (ownerIn),
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multithread (multithreadIn),
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swapChainEventHandle (ownerIn.swap.swapChainEvent->getHandle())
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{
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}
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~SwapChainThread()
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{
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SetEvent (quitEvent.getHandle());
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thread.join();
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}
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BackBufferLock getFreshPresentation()
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{
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return BackBufferLock (queue);
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}
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void notify()
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{
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SetEvent (queue.getWakeEvent());
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}
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private:
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Direct2DHwndContext::HwndPimpl& owner;
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PresentationQueue queue;
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ComSmartPtr<ID2D1Multithread> multithread;
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HANDLE swapChainEventHandle = nullptr;
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WindowsScopedEvent quitEvent;
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std::thread thread { [&] { threadLoop(); } };
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void threadLoop()
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{
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Thread::setCurrentThreadName ("JUCE D2D swap chain thread");
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bool swapChainReady = false;
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const auto serviceSwapChain = [&]
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{
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if (! swapChainReady)
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return;
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FrontBufferLock frontBufferLock { queue };
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auto* frontBuffer = frontBufferLock.getPresentation();
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if (frontBuffer == nullptr)
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return;
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JUCE_D2DMETRICS_SCOPED_ELAPSED_TIME (owner.owner.metrics, swapChainThreadTime);
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{
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ScopedMultithread scopedMultithread { multithread };
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owner.present (frontBuffer, 0);
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}
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swapChainReady = false;
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};
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for (;;)
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{
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const HANDLE handles[] { swapChainEventHandle, quitEvent.getHandle(), queue.getWakeEvent() };
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const auto waitResult = WaitForMultipleObjects ((DWORD) std::size (handles), handles, FALSE, INFINITE);
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switch (waitResult)
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{
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case WAIT_OBJECT_0:
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{
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swapChainReady = true;
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serviceSwapChain();
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break;
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}
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case WAIT_OBJECT_0 + 1:
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return;
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case WAIT_OBJECT_0 + 2:
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{
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serviceSwapChain();
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break;
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}
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case WAIT_FAILED:
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default:
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jassertfalse;
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break;
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}
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}
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}
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};
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SwapChain swap;
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ComSmartPtr<ID2D1DeviceContext1> deviceContext;
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std::unique_ptr<SwapChainThread> swapChainThread;
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BackBufferLock presentation;
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std::optional<CompositionTree> compositionTree;
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RectangleList<int> deferredRepaints;
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Rectangle<int> frameSize;
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std::vector<RECT> dirtyRectangles;
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bool resizing = false;
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int64 lastFinishFrameTicks = 0;
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HWND hwnd = nullptr;
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bool prepare() override
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{
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const auto adapter = directX->adapters.getAdapterForHwnd (hwnd);
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if (adapter == nullptr)
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return false;
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if (deviceContext == nullptr)
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deviceContext = Direct2DDeviceContext::create (adapter);
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if (deviceContext == nullptr)
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return false;
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if (! deviceResources.has_value())
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deviceResources = Direct2DDeviceResources::create (deviceContext);
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if (! deviceResources.has_value())
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return false;
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if (! hwnd || frameSize.isEmpty())
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return false;
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if (! swap.canPaint())
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{
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if (auto hr = swap.create (hwnd, frameSize, adapter); FAILED (hr))
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return false;
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if (auto hr = swap.createBuffer (getDeviceContext()); FAILED (hr))
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return false;
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}
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if (! swapChainThread && swap.swapChainEvent.has_value())
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swapChainThread = std::make_unique<SwapChainThread> (*this, directX->getD2DMultithread());
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if (! compositionTree.has_value())
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compositionTree = CompositionTree::create (adapter->dxgiDevice, hwnd, swap.chain);
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if (! compositionTree.has_value())
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return false;
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return true;
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}
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void teardown() override
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{
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compositionTree.reset();
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swapChainThread = nullptr;
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deviceContext = nullptr;
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swap.release();
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Pimpl::teardown();
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}
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RectangleList<int> getPaintAreas() const override
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{
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// Does the entire buffer need to be filled?
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if (swap.state == SwapChain::State::bufferAllocated || resizing)
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return swap.getSize();
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return deferredRepaints;
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}
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bool checkPaintReady() override
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{
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// Try not to saturate the message thread; this is a little crude. Perhaps some kind of credit system...
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if (auto now = Time::getHighResolutionTicks(); Time::highResolutionTicksToSeconds (now - lastFinishFrameTicks) < 0.001)
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return false;
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if (presentation.getPresentation() == nullptr)
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if (swapChainThread != nullptr)
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presentation = swapChainThread->getFreshPresentation();
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// Paint if:
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// resources are allocated
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// deferredRepaints has areas to be painted
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// the swap chain thread is ready
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bool ready = Pimpl::checkPaintReady();
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ready &= swap.canPaint();
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ready &= compositionTree.has_value();
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ready &= ! getPaintAreas().isEmpty();
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ready &= presentation.getPresentation() != nullptr;
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return ready;
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}
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JUCE_DECLARE_WEAK_REFERENCEABLE (HwndPimpl)
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public:
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HwndPimpl (Direct2DHwndContext& ownerIn, HWND hwndIn)
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: Pimpl (ownerIn),
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hwnd (hwndIn)
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{
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}
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~HwndPimpl() override = default;
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void handleShowWindow()
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{
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// One of the trickier problems was determining when Direct2D & DXGI resources can be safely created;
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// that's not really spelled out in the documentation.
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// This method is called when the component peer receives WM_SHOWWINDOW
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prepare();
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frameSize = getClientRect();
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deferredRepaints = frameSize;
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}
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Rectangle<int> getClientRect() const
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{
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RECT clientRect;
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GetClientRect (hwnd, &clientRect);
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return Rectangle<int>::leftTopRightBottom (clientRect.left, clientRect.top, clientRect.right, clientRect.bottom);
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}
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Rectangle<int> getFrameSize() const override
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{
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return getClientRect();
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}
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ComSmartPtr<ID2D1DeviceContext1> getDeviceContext() const override
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{
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return deviceContext;
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}
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ComSmartPtr<ID2D1Image> getDeviceContextTarget() const override
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{
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if (auto* p = presentation.getPresentation())
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return p->getPresentationBitmap (swap.getSize(), getDeviceContext());
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return {};
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}
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void setResizing (bool x)
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{
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resizing = x;
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}
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bool getResizing() const
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{
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return resizing;
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}
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void setSize (Rectangle<int> size)
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{
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if (size == frameSize || size.isEmpty())
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return;
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// Require the entire window to be repainted
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frameSize = size;
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deferredRepaints = size;
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InvalidateRect (hwnd, nullptr, TRUE);
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// Resize/scale the swap chain
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prepare();
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if (auto dc = getDeviceContext())
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{
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ScopedMultithread scopedMultithread { directX->getD2DMultithread() };
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auto hr = swap.resize (size, dc);
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jassert (SUCCEEDED (hr));
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if (FAILED (hr))
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teardown();
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if (swapChainThread)
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swapChainThread->notify();
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}
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}
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void addDeferredRepaint (Rectangle<int> deferredRepaint)
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{
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deferredRepaints.add (deferredRepaint);
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JUCE_TRACE_EVENT_INT_RECT (etw::repaint, etw::paintKeyword, snappedRectangle);
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}
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SavedState* startFrame (float dpiScale) override
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{
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if (resizing)
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{
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deferredRepaints = frameSize;
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setSize (getClientRect());
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}
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auto* savedState = Pimpl::startFrame (dpiScale);
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if (savedState == nullptr)
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return nullptr;
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// If a new frame is starting, clear deferredAreas in case repaint is called
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// while the frame is being painted to ensure the new areas are painted on the
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// next frame
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JUCE_TRACE_LOG_D2D_PAINT_CALL (etw::direct2dHwndPaintStart, owner.getFrameId());
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presentation.getPresentation()->setPaintAreas (getPaintAreas());
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deferredRepaints.clear();
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return savedState;
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}
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HRESULT finishFrame() override
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{
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const ScopeGuard scope { [this]
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{
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presentation = {};
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lastFinishFrameTicks = Time::getHighResolutionTicks();
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} };
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return Pimpl::finishFrame();
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}
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void present (Presentation* paintedPresentation, uint32 flags)
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{
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if (paintedPresentation == nullptr)
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return;
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// Fill out the array of dirty rectangles
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// Compare paintAreas to the swap chain buffer area. If the rectangles in paintAreas are contained
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// by the swap chain buffer area, then mark those rectangles as dirty. DXGI will only keep the dirty rectangles from the
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// current buffer and copy the clean area from the previous buffer.
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// The buffer needs to be completely filled before using dirty rectangles. The dirty rectangles need to be contained
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// within the swap chain buffer.
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JUCE_D2DMETRICS_SCOPED_ELAPSED_TIME (owner.metrics, present1Duration);
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// Allocate enough memory for the array of dirty rectangles
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const auto areas = paintedPresentation->getPaintAreas();
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paintedPresentation->setPaintAreas ({});
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dirtyRectangles.resize ((size_t) areas.getNumRectangles());
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// Fill the array of dirty rectangles, intersecting each paint area with the swap chain buffer
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DXGI_PRESENT_PARAMETERS presentParameters{};
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if (swap.state == SwapChain::State::bufferFilled)
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{
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auto* dirtyRectangle = dirtyRectangles.data();
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auto const swapChainSize = swap.getSize();
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for (const auto& area : areas)
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{
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// If this paint area contains the entire swap chain, then
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// no need for dirty rectangles
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if (area.contains (swapChainSize))
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{
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presentParameters.DirtyRectsCount = 0;
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break;
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}
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// Intersect this paint area with the swap chain buffer
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auto intersection = area.getIntersection (swapChainSize);
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if (intersection.isEmpty())
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{
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// Can't clip to an empty rectangle
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continue;
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}
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D2D1_POINT_2U destPoint { (uint32) intersection.getX(), (uint32) intersection.getY() };
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D2D1_RECT_U sourceRect { (uint32) intersection.getX(),
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(uint32) intersection.getY(),
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(uint32) intersection.getRight(),
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(uint32) intersection.getBottom() };
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swap.buffer->CopyFromBitmap (&destPoint, paintedPresentation->getPresentationBitmap(), &sourceRect);
|
|
|
|
// Add this intersected paint area to the dirty rectangle array (scaled for DPI)
|
|
*dirtyRectangle = D2DUtilities::toRECT (intersection);
|
|
|
|
dirtyRectangle++;
|
|
presentParameters.DirtyRectsCount++;
|
|
}
|
|
|
|
presentParameters.pDirtyRects = dirtyRectangles.data();
|
|
}
|
|
|
|
if (presentParameters.DirtyRectsCount == 0)
|
|
{
|
|
D2D1_POINT_2U destPoint { 0, 0 };
|
|
|
|
if (auto bitmap = paintedPresentation->getPresentationBitmap())
|
|
swap.buffer->CopyFromBitmap (&destPoint, bitmap, nullptr);
|
|
}
|
|
|
|
// Present the freshly painted buffer
|
|
const auto hr = swap.chain->Present1 (swap.presentSyncInterval, swap.presentFlags | flags, &presentParameters);
|
|
jassertquiet (SUCCEEDED (hr));
|
|
|
|
// The buffer is now completely filled and ready for dirty rectangles for the next frame
|
|
swap.state = SwapChain::State::bufferFilled;
|
|
|
|
JUCE_TRACE_LOG_D2D_PAINT_CALL (etw::direct2dHwndPaintEnd, owner.getFrameId());
|
|
}
|
|
|
|
Image createSnapshot() const
|
|
{
|
|
// This won't capture child windows. Perhaps a better approach would be to use
|
|
// IGraphicsCaptureItemInterop, although this is only supported on Windows 10 v1903+
|
|
|
|
const auto context = getDeviceContext();
|
|
|
|
if (frameSize.isEmpty() || context == nullptr || swap.buffer == nullptr)
|
|
return {};
|
|
|
|
// Create the bitmap to receive the snapshot
|
|
D2D1_BITMAP_PROPERTIES1 bitmapProperties{};
|
|
bitmapProperties.bitmapOptions = D2D1_BITMAP_OPTIONS_TARGET;
|
|
bitmapProperties.pixelFormat = swap.buffer->GetPixelFormat();
|
|
|
|
const D2D_SIZE_U size { (UINT32) frameSize.getWidth(), (UINT32) frameSize.getHeight() };
|
|
|
|
ComSmartPtr<ID2D1Bitmap1> snapshot;
|
|
|
|
if (const auto hr = context->CreateBitmap (size, nullptr, 0, bitmapProperties, snapshot.resetAndGetPointerAddress()); FAILED (hr))
|
|
return {};
|
|
|
|
const ScopedMultithread scope { directX->getD2DMultithread() };
|
|
|
|
swap.chain->Present (0, DXGI_PRESENT_DO_NOT_WAIT);
|
|
|
|
// Copy the swap chain buffer to the bitmap snapshot
|
|
D2D_POINT_2U p { 0, 0 };
|
|
const auto sourceRect = D2DUtilities::toRECT_U (frameSize);
|
|
|
|
if (const auto hr = snapshot->CopyFromBitmap (&p, swap.buffer, &sourceRect); FAILED (hr))
|
|
return {};
|
|
|
|
const Image result { new Direct2DPixelData { context, snapshot } };
|
|
|
|
swap.chain->Present (0, DXGI_PRESENT_DO_NOT_WAIT);
|
|
|
|
return result;
|
|
}
|
|
};
|
|
|
|
//==============================================================================
|
|
Direct2DHwndContext::Direct2DHwndContext (HWND windowHandle)
|
|
{
|
|
#if JUCE_DIRECT2D_METRICS
|
|
metrics = new Direct2DMetrics { Direct2DMetricsHub::getInstance()->lock,
|
|
"HWND " + String::toHexString ((pointer_sized_int) windowHandle),
|
|
windowHandle };
|
|
Direct2DMetricsHub::getInstance()->add (metrics);
|
|
#endif
|
|
|
|
pimpl = std::make_unique<HwndPimpl> (*this, windowHandle);
|
|
updateSize();
|
|
}
|
|
|
|
Direct2DHwndContext::~Direct2DHwndContext()
|
|
{
|
|
#if JUCE_DIRECT2D_METRICS
|
|
Direct2DMetricsHub::getInstance()->remove (metrics);
|
|
#endif
|
|
}
|
|
|
|
Direct2DGraphicsContext::Pimpl* Direct2DHwndContext::getPimpl() const noexcept
|
|
{
|
|
return pimpl.get();
|
|
}
|
|
|
|
void Direct2DHwndContext::handleShowWindow()
|
|
{
|
|
pimpl->handleShowWindow();
|
|
}
|
|
|
|
void Direct2DHwndContext::setResizing (bool x)
|
|
{
|
|
pimpl->setResizing (x);
|
|
}
|
|
|
|
bool Direct2DHwndContext::getResizing() const
|
|
{
|
|
return pimpl->getResizing();
|
|
}
|
|
|
|
void Direct2DHwndContext::setSize (int width, int height)
|
|
{
|
|
pimpl->setSize ({ width, height });
|
|
}
|
|
|
|
void Direct2DHwndContext::updateSize()
|
|
{
|
|
pimpl->setSize (pimpl->getClientRect());
|
|
}
|
|
|
|
void Direct2DHwndContext::addDeferredRepaint (Rectangle<int> deferredRepaint)
|
|
{
|
|
pimpl->addDeferredRepaint (deferredRepaint);
|
|
}
|
|
|
|
Image Direct2DHwndContext::createSnapshot() const
|
|
{
|
|
return pimpl->createSnapshot();
|
|
}
|
|
|
|
void Direct2DHwndContext::clearTargetBuffer()
|
|
{
|
|
pimpl->getDeviceContext()->Clear();
|
|
}
|
|
|
|
} // namespace juce
|