SF: Extract virtual display allocation from CE
Allocate HAL virtual display and generate HAL/GPU virtual display ID in
SF rather than CE. This centralizes the HAL vs. GPU decision as a first
step in isolating display configuration (e.g. hotplug, modeset) to be a
distinct stage from invalidate/refresh.
Rework SF backend hooks for screen capture. Plumb the PhysicalDisplayId
to be mirrored by the virtual display to Composer::createVirtualDisplay.
This enables the ARC backend to know which display to mirror (instead of
making assumptions about the layer stack) or error out if not mirroring
(previously done through maybeAllocateDisplayIdForVirtualDisplay), such
that SF falls back to creating a GPU virtual display.
Bug: 182939859
Bug: 129481165
Test: Enable overlay display and toggle HAL/GPU
Test: libsurfaceflinger_unittest
Test: libcompositionengine_test
Change-Id: I209b245966e544d5ff55d5d118140cfcfa85db15
Merged-In: I209b245966e544d5ff55d5d118140cfcfa85db15
diff --git a/services/surfaceflinger/DisplayHardware/HWComposer.h b/services/surfaceflinger/DisplayHardware/HWComposer.h
index d0c0c11..3ddcdd8 100644
--- a/services/surfaceflinger/DisplayHardware/HWComposer.h
+++ b/services/surfaceflinger/DisplayHardware/HWComposer.h
@@ -39,7 +39,6 @@
#include <utils/StrongPointer.h>
#include <utils/Timers.h>
-#include "DisplayIdGenerator.h"
#include "DisplayIdentification.h"
#include "DisplayMode.h"
#include "HWC2.h"
@@ -109,9 +108,16 @@
virtual bool hasCapability(hal::Capability) const = 0;
virtual bool hasDisplayCapability(HalDisplayId, hal::DisplayCapability) const = 0;
- // Attempts to allocate a virtual display and returns its ID if created on the HWC device.
- virtual std::optional<DisplayId> allocateVirtualDisplay(uint32_t width, uint32_t height,
- ui::PixelFormat*) = 0;
+ virtual size_t getMaxVirtualDisplayCount() const = 0;
+ virtual size_t getMaxVirtualDisplayDimension() const = 0;
+
+ // Attempts to allocate a virtual display on the HWC. The maximum number of virtual displays
+ // supported by the HWC can be queried in advance, but allocation may fail for other reasons.
+ // For virtualized compositors, the PhysicalDisplayId is a hint that this virtual display is
+ // a mirror of a physical display, and that the screen should be captured by the host rather
+ // than guest compositor.
+ virtual bool allocateVirtualDisplay(HalVirtualDisplayId, ui::Size, ui::PixelFormat*,
+ std::optional<PhysicalDisplayId> mirror) = 0;
virtual void allocatePhysicalDisplay(hal::HWDisplayId, PhysicalDisplayId) = 0;
@@ -254,9 +260,11 @@
bool hasCapability(hal::Capability) const override;
bool hasDisplayCapability(HalDisplayId, hal::DisplayCapability) const override;
- // Attempts to allocate a virtual display and returns its ID if created on the HWC device.
- std::optional<DisplayId> allocateVirtualDisplay(uint32_t width, uint32_t height,
- ui::PixelFormat*) override;
+ size_t getMaxVirtualDisplayCount() const override;
+ size_t getMaxVirtualDisplayDimension() const override;
+
+ bool allocateVirtualDisplay(HalVirtualDisplayId, ui::Size, ui::PixelFormat*,
+ std::optional<PhysicalDisplayId>) override;
// Called from SurfaceFlinger, when the state for a new physical display needs to be recreated.
void allocatePhysicalDisplay(hal::HWDisplayId, PhysicalDisplayId) override;
@@ -402,7 +410,6 @@
void loadCapabilities();
void loadLayerMetadataSupport();
- uint32_t getMaxVirtualDisplayCount() const;
std::unordered_map<HalDisplayId, DisplayData> mDisplayData;
@@ -416,8 +423,7 @@
std::optional<hal::HWDisplayId> mExternalHwcDisplayId;
bool mHasMultiDisplaySupport = false;
- RandomDisplayIdGenerator<HalVirtualDisplayId> mVirtualIdGenerator{getMaxVirtualDisplayCount()};
-
+ const size_t mMaxVirtualDisplayDimension;
const bool mUpdateDeviceProductInfoOnHotplugReconnect;
};