Revert "Refactor of screenshot code on main thread."

This reverts commit b43b58378679bf4ac8d0837047187d4509bc45d8.

Reason for revert: Appstartup regression found in b/327488235

Change-Id: I8d975b81afd2cde1d543e8bc7e730a6e42393bec
diff --git a/services/surfaceflinger/RegionSamplingThread.cpp b/services/surfaceflinger/RegionSamplingThread.cpp
index 77e045d..c888ccc 100644
--- a/services/surfaceflinger/RegionSamplingThread.cpp
+++ b/services/surfaceflinger/RegionSamplingThread.cpp
@@ -377,8 +377,8 @@
     constexpr bool kIsProtected = false;
 
     if (const auto fenceResult =
-                mFlinger.captureScreenshot(std::move(renderAreaFuture), getLayerSnapshots, buffer,
-                                           kRegionSampling, kGrayscale, kIsProtected, nullptr)
+                mFlinger.captureScreenCommon(std::move(renderAreaFuture), getLayerSnapshots, buffer,
+                                             kRegionSampling, kGrayscale, kIsProtected, nullptr)
                         .get();
         fenceResult.ok()) {
         fenceResult.value()->waitForever(LOG_TAG);
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 84956d0..edba50b 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -8040,19 +8040,6 @@
                         args.allowProtected, args.grayscale, captureListener);
 }
 
-bool SurfaceFlinger::layersHasProtectedLayer(
-        const std::vector<std::pair<Layer*, sp<LayerFE>>>& layers) const {
-    bool protectedLayerFound = false;
-    for (auto& [_, layerFe] : layers) {
-        protectedLayerFound |=
-                (layerFe->mSnapshot->isVisible && layerFe->mSnapshot->hasProtectedContent);
-        if (protectedLayerFound) {
-            break;
-        }
-    }
-    return protectedLayerFound;
-}
-
 void SurfaceFlinger::captureScreenCommon(RenderAreaFuture renderAreaFuture,
                                          GetLayerSnapshotsFunction getLayerSnapshots,
                                          ui::Size bufferSize, ui::PixelFormat reqPixelFormat,
@@ -8068,9 +8055,6 @@
         return;
     }
 
-    // Snapshots must be taken from the main thread.
-    auto layers = mScheduler->schedule([=]() { return getLayerSnapshots(); }).get();
-
     // Loop over all visible layers to see whether there's any protected layer. A protected layer is
     // typically a layer with DRM contents, or have the GRALLOC_USAGE_PROTECTED set on the buffer.
     // A protected layer has no implication on whether it's secure, which is explicitly set by
@@ -8078,7 +8062,18 @@
     const bool supportsProtected = getRenderEngine().supportsProtectedContent();
     bool hasProtectedLayer = false;
     if (allowProtected && supportsProtected) {
-        hasProtectedLayer = layersHasProtectedLayer(layers);
+        hasProtectedLayer = mScheduler
+                                    ->schedule([=]() {
+                                        bool protectedLayerFound = false;
+                                        auto layers = getLayerSnapshots();
+                                        for (auto& [_, layerFe] : layers) {
+                                            protectedLayerFound |=
+                                                    (layerFe->mSnapshot->isVisible &&
+                                                     layerFe->mSnapshot->hasProtectedContent);
+                                        }
+                                        return protectedLayerFound;
+                                    })
+                                    .get();
     }
     const bool isProtected = hasProtectedLayer && allowProtected && supportsProtected;
     const uint32_t usage = GRALLOC_USAGE_HW_COMPOSER | GRALLOC_USAGE_HW_RENDER |
@@ -8103,53 +8098,52 @@
             renderengine::impl::ExternalTexture>(buffer, getRenderEngine(),
                                                  renderengine::impl::ExternalTexture::Usage::
                                                          WRITEABLE);
-    auto futureFence =
-            captureScreenshot(std::move(renderAreaFuture), getLayerSnapshots, texture,
-                              false /* regionSampling */, grayscale, isProtected, captureListener);
-    futureFence.get();
+    auto fence = captureScreenCommon(std::move(renderAreaFuture), getLayerSnapshots, texture,
+                                     false /* regionSampling */, grayscale, isProtected,
+                                     captureListener);
+    fence.get();
 }
 
-ftl::SharedFuture<FenceResult> SurfaceFlinger::captureScreenshot(
+ftl::SharedFuture<FenceResult> SurfaceFlinger::captureScreenCommon(
         RenderAreaFuture renderAreaFuture, GetLayerSnapshotsFunction getLayerSnapshots,
         const std::shared_ptr<renderengine::ExternalTexture>& buffer, bool regionSampling,
         bool grayscale, bool isProtected, const sp<IScreenCaptureListener>& captureListener) {
     ATRACE_CALL();
 
-    auto takeScreenshotFn = [=, this, renderAreaFuture = std::move(renderAreaFuture)]() REQUIRES(
-                                    kMainThreadContext) mutable -> ftl::SharedFuture<FenceResult> {
-        ScreenCaptureResults captureResults;
-        std::shared_ptr<RenderArea> renderArea = renderAreaFuture.get();
-        if (!renderArea) {
-            ALOGW("Skipping screen capture because of invalid render area.");
-            if (captureListener) {
-                captureResults.fenceResult = base::unexpected(NO_MEMORY);
-                captureListener->onScreenCaptureCompleted(captureResults);
-            }
-            return ftl::yield<FenceResult>(base::unexpected(NO_ERROR)).share();
-        }
-
-        ftl::SharedFuture<FenceResult> renderFuture;
-        renderArea->render([&]() FTL_FAKE_GUARD(kMainThreadContext) {
-            renderFuture = renderScreenImpl(renderArea, getLayerSnapshots, buffer, regionSampling,
-                                            grayscale, isProtected, captureResults);
-        });
-
-        if (captureListener) {
-            // Defer blocking on renderFuture back to the Binder thread.
-            return ftl::Future(std::move(renderFuture))
-                    .then([captureListener, captureResults = std::move(captureResults)](
-                                  FenceResult fenceResult) mutable -> FenceResult {
-                        captureResults.fenceResult = std::move(fenceResult);
+    auto future = mScheduler->schedule(
+            [=, this, renderAreaFuture = std::move(renderAreaFuture)]() FTL_FAKE_GUARD(
+                    kMainThreadContext) mutable -> ftl::SharedFuture<FenceResult> {
+                ScreenCaptureResults captureResults;
+                std::shared_ptr<RenderArea> renderArea = renderAreaFuture.get();
+                if (!renderArea) {
+                    ALOGW("Skipping screen capture because of invalid render area.");
+                    if (captureListener) {
+                        captureResults.fenceResult = base::unexpected(NO_MEMORY);
                         captureListener->onScreenCaptureCompleted(captureResults);
-                        return base::unexpected(NO_ERROR);
-                    })
-                    .share();
-        }
-        return renderFuture;
-    };
+                    }
+                    return ftl::yield<FenceResult>(base::unexpected(NO_ERROR)).share();
+                }
 
-    auto future =
-            mScheduler->schedule(FTL_FAKE_GUARD(kMainThreadContext, std::move(takeScreenshotFn)));
+                ftl::SharedFuture<FenceResult> renderFuture;
+                renderArea->render([&]() FTL_FAKE_GUARD(kMainThreadContext) {
+                    renderFuture =
+                            renderScreenImpl(renderArea, getLayerSnapshots, buffer, regionSampling,
+                                             grayscale, isProtected, captureResults);
+                });
+
+                if (captureListener) {
+                    // Defer blocking on renderFuture back to the Binder thread.
+                    return ftl::Future(std::move(renderFuture))
+                            .then([captureListener, captureResults = std::move(captureResults)](
+                                          FenceResult fenceResult) mutable -> FenceResult {
+                                captureResults.fenceResult = std::move(fenceResult);
+                                captureListener->onScreenCaptureCompleted(captureResults);
+                                return base::unexpected(NO_ERROR);
+                            })
+                            .share();
+                }
+                return renderFuture;
+            });
 
     // Flatten nested futures.
     auto chain = ftl::Future(std::move(future)).then([](ftl::SharedFuture<FenceResult> future) {
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index fdeede1..be05797 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -874,17 +874,13 @@
     // Boot animation, on/off animations and screen capture
     void startBootAnim();
 
-    bool layersHasProtectedLayer(const std::vector<std::pair<Layer*, sp<LayerFE>>>& layers) const;
-
     void captureScreenCommon(RenderAreaFuture, GetLayerSnapshotsFunction, ui::Size bufferSize,
                              ui::PixelFormat, bool allowProtected, bool grayscale,
                              const sp<IScreenCaptureListener>&);
-
-    ftl::SharedFuture<FenceResult> captureScreenshot(
+    ftl::SharedFuture<FenceResult> captureScreenCommon(
             RenderAreaFuture, GetLayerSnapshotsFunction,
             const std::shared_ptr<renderengine::ExternalTexture>&, bool regionSampling,
             bool grayscale, bool isProtected, const sp<IScreenCaptureListener>&);
-
     ftl::SharedFuture<FenceResult> renderScreenImpl(
             std::shared_ptr<const RenderArea>, GetLayerSnapshotsFunction,
             const std::shared_ptr<renderengine::ExternalTexture>&, bool regionSampling,