The ConfigStore HAL remains in AOSP to support legacy vendor partitions. On
devices running Android 10+, surfaceflinger
first
reads system properties. If no system property is defined for a config item in
SurfaceFlingerProperties.sysprop
, surfaceflinger
falls back to the
ConfigStore HAL.
Build flags and system properties
Each build flag in ConfigStore has a matching system property, as shown in the
following table. For details on these properties, see
frameworks/native/services/surfaceflinger/sysprop/
SurfaceFlingerProperties.sysprop
.
Build flags | System properties |
---|---|
TARGET_FORCE_HWC_FOR_VIRTUAL_DISPLAYS
|
ro.surface_flinger.force_hwc_copy_for_virtual_displays
|
TARGET_HAS_HDR_DISPLAY
|
ro.surface_flinger.has_HDR_display
|
TARGET_HAS_WIDE_COLOR_DISPLAY
|
ro.surface_flinger.has_wide_color_display
|
NUM_FRAMEBUFFER_SURFACE_BUFFERS
|
ro.surface_flinger.max_frame_buffer_acquired_buffers
|
MAX_VIRTUAL_DISPLAY_DIMENSION
|
ro.surface_flinger.max_virtual_display_dimension
|
PRIMARY_DISPLAY_ORIENTATION
|
ro.surface_flinger.primary_display_orientation
|
PRESENT_TIME_OFFSET_FROM_VSYNC_NS
|
ro.surface_flinger.present_time_offset_from_vsync_ns
|
TARGET_RUNNING_WITHOUT_SYNC_FRAMEWORK
|
ro.surface_flinger.running_without_sync_framework
|
SF_START_GRAPHICS_ALLOCATOR_SERVICE
|
ro.surface_flinger.start_graphics_allocator_service
|
TARGET_USE_CONTEXT_PRIORITY
|
ro.surface_flinger.use_context_priority
|
USE_VR_FLINGER
|
ro.surface_flinger.use_vr_flinger
|
VSYNC_EVENT_PHASE_OFFSET_NS
|
ro.surface_flinger.vsync_event_phase_offset_ns
|
SF_VSYNC_EVENT_PHASE_OFFSET_NS
|
ro.surface_flinger.vsync_sf_event_phase_offset_ns
|
Use SurfaceFlingerProperties
The following examples show how to use the SurfaceFlingerProperties
library
and the Surface Flinger property
ro.surface_flinger.vsync_event_phase_offset_ns
.
To query the property's value, use its api_name
as the function name.
Include SurfaceFlingerProperties
in your build file, as follows:
cc_binary {
name: "cc_client",
srcs: ["baz.cpp"],
shared_libs: ["SurfaceFlingerProperties"],
}
java_library {
name: "JavaClient",
srcs: ["foo/bar.java"],
libs: ["SurfaceFlingerProperties"],
}
The following Java code snippet uses the
ro.surface_flinger.vsync_event_phase_offset_ns
system property:
import android.sysprop.SurfaceFlingerProperties;
...
static void foo() {
...
boolean temp = SurfaceFlingerProperties.vsync_event_phase_offset_ns().orElse(true);
...
}
...
The following C++ code snippet uses the
ro.surface_flinger.vsync_event_phase_offset_ns
system property:
#include <SurfaceFlingerProperties.sysprop.h>
using namespace android::sysprop;
...
void bar() {
...
bool temp = SurfaceFlingerProperties::vsync_event_phase_offset_ns(true);
...
}
...