Improve picture capture debug path

* Fixes hardware bitmap capture
* Fixes mutable bitmap capture (no flickering)
* Adds basic single-frame LRU cache to avoid
  repeated readbacks of GPU resources
* Does up-front readback of GPU resources
* Moves serialization off RenderThread again thanks
  to up-front readback avoiding needing GPU access
  off-thread
* Reduces RAM usage & improves performance by serializing
  directly to output stream instead of first copying to
  a byte[]

Bug: 174223722
Test: PictureCaptureDemo mirrors the content
Change-Id: If7ec208b61d5b917e82087cc312880fc5a38c943

1 files changed, 8 insertions, 0 deletions

diff --git a/libs/hwui/Readback.cpp b/libs/hwui/Readback.cpp
index 8a8b4181bd94..d8735ce57b65 100644
--- a/libs/hwui/Readback.cpp
+++ b/libs/hwui/Readback.cpp
@@ -275,6 +275,14 @@ CopyResult Readback::copyLayerInto(DeferredLayerUpdater* deferredLayer, SkBitmap
     return copyResult;
 }
 
+CopyResult Readback::copyImageInto(const sk_sp<SkImage>& image, SkBitmap* bitmap) {
+    Rect srcRect;
+    Matrix4 transform;
+    transform.loadScale(1, -1, 1);
+    transform.translate(0, -1);
+    return copyImageInto(image, transform, srcRect, bitmap);
+}
+
 CopyResult Readback::copyImageInto(const sk_sp<SkImage>& image, Matrix4& texTransform,
                                    const Rect& srcRect, SkBitmap* bitmap) {
     ATRACE_CALL();