зеркало из https://github.com/mozilla/gecko-dev.git
61 строка
2.2 KiB
C++
61 строка
2.2 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_layers_CompositorScreenshotGrabber_h
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#define mozilla_layers_CompositorScreenshotGrabber_h
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#include "mozilla/UniquePtr.h"
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namespace mozilla {
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namespace layers {
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class Compositor;
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class CompositorScreenshotGrabberImpl;
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/**
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* Used by LayerManagerComposite to grab snapshots from the compositor and
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* submit them to the Gecko profiler.
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* Doesn't do any work if the profiler is not running or the "screenshots"
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* feature is not enabled.
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* Screenshots are scaled down to fit within a fixed size, and read back to
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* main memory using async readback. Scaling is done in multiple scale-by-0.5x
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* steps using CompositingRenderTargets and Compositor::BlitFromRenderTarget,
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* and readback is done using AsyncReadbackBuffers.
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*/
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class CompositorScreenshotGrabber final {
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public:
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CompositorScreenshotGrabber();
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~CompositorScreenshotGrabber();
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// Scale the contents of aCompositor's current render target into an
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// approapriately sized CompositingRenderTarget and read its contents into an
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// AsyncReadbackBuffer. The AsyncReadbackBuffer is not mapped into main
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// memory until the second call to MaybeProcessQueue() after this call to
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// MaybeGrabScreenshot().
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void MaybeGrabScreenshot(Compositor* aCompositor);
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// Map the contents of any outstanding AsyncReadbackBuffers from previous
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// composites into main memory and submit each screenshot to the profiler.
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void MaybeProcessQueue();
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// Insert a special profiler marker for a composite that didn't do any actual
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// compositing, so that the profiler knows why no screenshot was taken for
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// this frame.
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void NotifyEmptyFrame();
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// Destroy all Compositor-related resources that this class is holding on to.
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void Destroy();
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private:
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// non-null while ProfilerScreenshots::IsEnabled() returns true
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UniquePtr<CompositorScreenshotGrabberImpl> mImpl;
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};
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} // namespace layers
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} // namespace mozilla
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#endif // mozilla_layers_CompositorScreenshotGrabber_h
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