SurfaceFlinger: Add childLayersOnly variant of capture layers.
Currently captureLayers is being used to capture children of abstract
buffer-less layers, for example we capture the node representing
a Task. Because of animations, etc, the node may have been scaled
when we want to take the screenshot, so we solved this problem with
an inverse transform in LayerRenderArea. However we have parallel problems
for crop, visibility, etc...It seems what we really want from captureLayers
is the ability to capture all child layers while ignoring the parent imposed
state as if in a parallel hierarchy. I initially considered implementing a parallel
hierarchy with layer clones but it seemed much less risky for P to instead
reparent the existing hierarchy to a parallel abstract parent on the server side.
Bug: 72760590
Test: Existing tests pass. Quickstep works with new implementation. New transaction tests.
Change-Id: Ifd2b2f9ed45351d8ed0d7f09be1cd9806ec4abe8
diff --git a/libs/gui/ISurfaceComposer.cpp b/libs/gui/ISurfaceComposer.cpp
index 5de84ec..beda778 100644
--- a/libs/gui/ISurfaceComposer.cpp
+++ b/libs/gui/ISurfaceComposer.cpp
@@ -132,12 +132,13 @@
virtual status_t captureLayers(const sp<IBinder>& layerHandleBinder,
sp<GraphicBuffer>* outBuffer, const Rect& sourceCrop,
- float frameScale) {
+ float frameScale, bool childrenOnly) {
Parcel data, reply;
data.writeInterfaceToken(ISurfaceComposer::getInterfaceDescriptor());
data.writeStrongBinder(layerHandleBinder);
data.write(sourceCrop);
data.writeFloat(frameScale);
+ data.writeBool(childrenOnly);
status_t err = remote()->transact(BnSurfaceComposer::CAPTURE_LAYERS, data, &reply);
if (err != NO_ERROR) {
@@ -629,8 +630,10 @@
Rect sourceCrop(Rect::EMPTY_RECT);
data.read(sourceCrop);
float frameScale = data.readFloat();
+ bool childrenOnly = data.readBool();
- status_t res = captureLayers(layerHandleBinder, &outBuffer, sourceCrop, frameScale);
+ status_t res = captureLayers(layerHandleBinder, &outBuffer, sourceCrop, frameScale,
+ childrenOnly);
reply->writeInt32(res);
if (res == NO_ERROR) {
reply->write(*outBuffer);
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index 92a24ad..0d7ffc3 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -751,7 +751,17 @@
float frameScale, sp<GraphicBuffer>* outBuffer) {
sp<ISurfaceComposer> s(ComposerService::getComposerService());
if (s == NULL) return NO_INIT;
- status_t ret = s->captureLayers(layerHandle, outBuffer, sourceCrop, frameScale);
+ status_t ret = s->captureLayers(layerHandle, outBuffer, sourceCrop, frameScale,
+ false /* childrenOnly */);
+ return ret;
+}
+
+status_t ScreenshotClient::captureChildLayers(const sp<IBinder>& layerHandle, Rect sourceCrop,
+ float frameScale, sp<GraphicBuffer>* outBuffer) {
+ sp<ISurfaceComposer> s(ComposerService::getComposerService());
+ if (s == NULL) return NO_INIT;
+ status_t ret = s->captureLayers(layerHandle, outBuffer, sourceCrop, frameScale,
+ true /* childrenOnly */);
return ret;
}
// ----------------------------------------------------------------------------
diff --git a/libs/gui/include/gui/ISurfaceComposer.h b/libs/gui/include/gui/ISurfaceComposer.h
index e26e332..5ab6445 100644
--- a/libs/gui/include/gui/ISurfaceComposer.h
+++ b/libs/gui/include/gui/ISurfaceComposer.h
@@ -173,9 +173,12 @@
int32_t minLayerZ, int32_t maxLayerZ, bool useIdentityTransform,
Rotation rotation = eRotateNone) = 0;
+ /**
+ * Capture a subtree of the layer hierarchy, potentially ignoring the root node.
+ */
virtual status_t captureLayers(const sp<IBinder>& layerHandleBinder,
sp<GraphicBuffer>* outBuffer, const Rect& sourceCrop,
- float frameScale = 1.0) = 0;
+ float frameScale = 1.0, bool childrenOnly = false) = 0;
/* Clears the frame statistics for animations.
*
diff --git a/libs/gui/include/gui/SurfaceComposerClient.h b/libs/gui/include/gui/SurfaceComposerClient.h
index 3fe6635..fe46146 100644
--- a/libs/gui/include/gui/SurfaceComposerClient.h
+++ b/libs/gui/include/gui/SurfaceComposerClient.h
@@ -297,8 +297,10 @@
uint32_t reqHeight, int32_t minLayerZ, int32_t maxLayerZ,
bool useIdentityTransform, uint32_t rotation,
sp<GraphicBuffer>* outBuffer);
- static status_t captureLayers(const sp<IBinder>& layerHandle, Rect sourceCrop, float fameScale,
+ static status_t captureLayers(const sp<IBinder>& layerHandle, Rect sourceCrop, float frameScale,
sp<GraphicBuffer>* outBuffer);
+ static status_t captureChildLayers(const sp<IBinder>& layerHandle, Rect sourceCrop,
+ float frameScale, sp<GraphicBuffer>* outBuffer);
};
// ---------------------------------------------------------------------------
diff --git a/libs/gui/tests/Surface_test.cpp b/libs/gui/tests/Surface_test.cpp
index 8060b6e..4fb51e1 100644
--- a/libs/gui/tests/Surface_test.cpp
+++ b/libs/gui/tests/Surface_test.cpp
@@ -593,8 +593,8 @@
bool /*useIdentityTransform*/,
Rotation /*rotation*/) override { return NO_ERROR; }
virtual status_t captureLayers(const sp<IBinder>& /*parentHandle*/,
- sp<GraphicBuffer>* /*outBuffer*/,
- const Rect& /*sourceCrop*/, float /*frameScale*/) override {
+ sp<GraphicBuffer>* /*outBuffer*/, const Rect& /*sourceCrop*/,
+ float /*frameScale*/, bool /*childrenOnly*/) override {
return NO_ERROR;
}
status_t clearAnimationFrameStats() override { return NO_ERROR; }