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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_layers_RendererScreenshotGrabber_h
#define mozilla_layers_RendererScreenshotGrabber_h
#include "mozilla/TimeStamp.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/gfx/Point.h"
#include "mozilla/layers/ProfilerScreenshots.h"
#include "mozilla/webrender/webrender_ffi.h"
#include "nsTArray.h"
namespace mozilla {
namespace wr {
struct Renderer;
class RendererOGL;
/**
* Used by |RendererOGL| to grab screenshots from WebRender and submit them to
* the Gecko profiler.
*
* If the profiler is not running or the screenshots feature is disabled, no
* work will be done.
*/
class RendererScreenshotGrabber final {
public:
RendererScreenshotGrabber();
/**
* Grab a screenshot from WebRender if we are profiling and screenshots are
* enabled.
*
* The captured screenshot will not be mapped until the second call to
* |MaybeProcessQueue| after this call to |MaybeGrabScreenshot|.
*/
void MaybeGrabScreenshot(RendererOGL* aRendererOGL,
const gfx::IntSize& aWindowSize);
/**
* Process the screenshots pending in the queue if we are profiling and
* screenshots are enabled.
*/
void MaybeProcessQueue(RendererOGL* aRenderer);
private:
/**
* Drop all our allocated memory when we are no longer profiling.
*
* This will also instruct WebRender to drop all its Gecko profiler
* associated memory.
*/
void Destroy(Renderer* aRenderer);
/**
* Actually grab a screenshot from WebRender.
*/
void GrabScreenshot(Renderer* aRenderer, const gfx::IntSize& aWindowSize);
/**
* Process the screenshots pending in the queue.
*/
void ProcessQueue(Renderer* aRenderer);
struct QueueItem {
mozilla::TimeStamp mTimeStamp;
AsyncScreenshotHandle mHandle;
gfx::IntSize mScreenshotSize;
gfx::IntSize mWindowSize;
uintptr_t mWindowIdentifier;
};
/**
* The maximum size for screenshots, as dictated by
* |ProfilerScrenshots::ScreenshotSize|.
*/
gfx::IntSize mMaxScreenshotSize;
/**
* The queue of screenshots waiting to be processed and submitted.
*/
nsTArray<QueueItem> mQueue;
/**
* The queue item for the current frame. This will be inserted into the queue
* after a call to |MaybeProcessQueue| so it will be not be processed until
* the next frame.
*/
Maybe<QueueItem> mCurrentFrameQueueItem;
/**
* Our handle to the profiler screenshots object.
*/
RefPtr<mozilla::layers::ProfilerScreenshots> mProfilerScreenshots;
};
} // namespace wr
} // namespace mozilla
#endif // mozilla_layers_RendererScreenshotGrabber_h
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