Enable offscreen buffers in mskp captures for RenderEngine
This CL also fixes a threading bug in mskp captures. Previously,
if the mskp timer fired in the middle of RE drawing a frame it would
crash because the timer thread would delete the canvas. The mutex
that was introduced will prevent the canvas from being deleted until
after the frame has completed drawing.
Test: capture mskp with background blur
Bug: 176903027
Change-Id: I59442d729b17a7edfd6df7ff9295864d1d67f0d7
diff --git a/libs/renderengine/skia/debug/SkiaCapture.h b/libs/renderengine/skia/debug/SkiaCapture.h
index eaaf598..08a1359 100644
--- a/libs/renderengine/skia/debug/SkiaCapture.h
+++ b/libs/renderengine/skia/debug/SkiaCapture.h
@@ -18,8 +18,12 @@
#include <SkDocument.h>
#include <SkNWayCanvas.h>
+#include <SkPictureRecorder.h>
#include <SkSurface.h>
+
#include <chrono>
+#include <mutex>
+
#include "CaptureTimer.h"
#include "tools/SkSharingProc.h"
@@ -48,6 +52,16 @@
// Returns whether the capture is running.
bool isCaptureRunning() { return mCaptureRunning; }
+ // Offscreen state member variables are private to SkiaCapture, but the allocation
+ // and lifetime is managed by the caller. This enables nested offscreen
+ // captures to occur.
+ struct OffscreenState {
+ std::unique_ptr<SkPictureRecorder> offscreenRecorder;
+ std::unique_ptr<SkNWayCanvas> offscreenCanvas;
+ };
+ SkCanvas* tryOffscreenCapture(SkSurface* surface, OffscreenState* state);
+ uint64_t endOffscreenCapture(OffscreenState* state);
+
private:
// Performs the first-frame work of a multi frame SKP capture. Returns true if successful.
bool setupMultiFrameCapture();
@@ -61,10 +75,16 @@
std::unique_ptr<SkSharingSerialContext> mSerialContext;
std::unique_ptr<SkNWayCanvas> mNwayCanvas;
+ SkCanvas* mCurrentPageCanvas;
+
// Capturing and interval control.
bool mCaptureRunning = false;
CaptureTimer mTimer;
Interval mTimerInterval = 0ms;
+
+ // Mutex to ensure that a frame in progress when the timer fires is allowed to run to
+ // completion before we write the file to disk.
+ std::mutex mMutex;
};
} // namespace skia