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6d2642e09e
This requires passing down the window size down in a different way, because the NativeLayerRootSnapshotter does not know the window size otherwise. At the same time, this patch also removes WindowNLRS and makes the NativeLayerRoot implement the profiler_screenshots::Window interface directly. Differential Revision: https://phabricator.services.mozilla.com/D89864
140 lines
4.3 KiB
C++
140 lines
4.3 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_ScreenshotGrabber_h
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#define mozilla_layers_ScreenshotGrabber_h
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#include "nsISupportsImpl.h"
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#include "mozilla/RefPtr.h"
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#include "mozilla/UniquePtr.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/gfx/Point.h"
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#include "mozilla/gfx/Rect.h"
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namespace mozilla {
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namespace layers {
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namespace profiler_screenshots {
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class Window;
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class RenderSource;
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class DownscaleTarget;
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class AsyncReadbackBuffer;
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class ScreenshotGrabberImpl;
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} // namespace profiler_screenshots
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/**
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* Used by various renderers / layer managers to grab snapshots from the window
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* and 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 DownscaleTarget::CopyFrom, and readback is done using
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* AsyncReadbackBuffers.
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*/
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class ScreenshotGrabber final {
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public:
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ScreenshotGrabber();
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~ScreenshotGrabber();
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// Scale the contents of aWindow's current render target into an
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// appropriately sized DownscaleTarget 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(profiler_screenshots::Window& aWindow,
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const gfx::IntSize& aWindowSize);
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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 Window-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<profiler_screenshots::ScreenshotGrabberImpl> mImpl;
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};
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// Interface definitions.
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namespace profiler_screenshots {
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class Window {
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public:
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virtual already_AddRefed<RenderSource> GetWindowContents(
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const gfx::IntSize& aWindowSize) = 0;
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virtual already_AddRefed<DownscaleTarget> CreateDownscaleTarget(
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const gfx::IntSize& aSize) = 0;
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virtual already_AddRefed<AsyncReadbackBuffer> CreateAsyncReadbackBuffer(
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const gfx::IntSize& aSize) = 0;
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protected:
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virtual ~Window() {}
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};
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class RenderSource {
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(RenderSource)
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const auto& Size() const { return mSize; }
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protected:
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explicit RenderSource(const gfx::IntSize& aSize) : mSize(aSize) {}
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virtual ~RenderSource() {}
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const gfx::IntSize mSize;
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};
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class DownscaleTarget {
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(DownscaleTarget)
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virtual already_AddRefed<RenderSource> AsRenderSource() = 0;
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const auto& Size() const { return mSize; }
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virtual bool DownscaleFrom(RenderSource* aSource,
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const gfx::IntRect& aSourceRect,
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const gfx::IntRect& aDestRect) = 0;
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protected:
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explicit DownscaleTarget(const gfx::IntSize& aSize) : mSize(aSize) {}
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virtual ~DownscaleTarget() {}
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const gfx::IntSize mSize;
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};
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class AsyncReadbackBuffer {
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(
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mozilla::layers::profiler_screenshots::AsyncReadbackBuffer)
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const auto& Size() const { return mSize; }
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virtual void CopyFrom(RenderSource* aSource) = 0;
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virtual bool MapAndCopyInto(gfx::DataSourceSurface* aSurface,
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const gfx::IntSize& aReadSize) = 0;
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protected:
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explicit AsyncReadbackBuffer(const gfx::IntSize& aSize) : mSize(aSize) {}
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virtual ~AsyncReadbackBuffer() {}
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const gfx::IntSize mSize;
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};
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} // namespace profiler_screenshots
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} // namespace layers
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} // namespace mozilla
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#endif // mozilla_layers_ScreenshotGrabber_h
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