Google is committed to advancing racial equity for Black communities. See how.
本頁面由 Cloud Translation API 翻譯而成。
Switch to English

配置中

由於佔用大量內存和使用困難,Android 10棄用了ConfigStore HAL,並用系統屬性替換了HAL。在Android 10中:

  • ConfigStore使用構建標誌將配置值存儲在供應商分區中,並且系統分區中的服務使用HIDL訪問這些值(在Android 9中也是如此)。
  • 系統屬性使用PRODUCT_DEFAULT_PROPERTY_OVERRIDES將系統屬性存儲在default.prop中的供應商分區中,並且該服務使用sysprop讀取這些屬性。

ConfigStore HAL保留在AOSP中以支持舊的供應商分區。在運行Android 10的設備上, surfaceflinger首先讀取系統屬性;如果在SurfaceFlingerProperties.sysprop沒有為配置項定義任何系統屬性,則surfaceflinger退回到ConfigStore HAL。

構建標誌和系統屬性

ConfigStore中的每個構建標誌都有一個匹配的系統屬性,如下表所示。

建立標記系統屬性
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

新系統屬性

Android 10包含以下新系統屬性:

  • ro.surface_flinger.default_composition_dataspace
  • ro.surface_flinger.default_composition_pixel_format
  • ro.surface_flinger.use_color_management
  • ro.surface_flinger.wcg_composition_dataspace
  • ro.surface_flinger.wcg_composition_pixel_format
  • ro.surface_flinger.display_primary_red
  • ro.surface_flinger.display_primary_green
  • ro.surface_flinger.display_primary_blue
  • ro.surface_flinger.display_primary_white
  • ro.surface_flinger.protected_contents
  • ro.surface_flinger.set_idle_timer_ms
  • ro.surface_flinger.set_touch_timer_ms
  • ro.surface_flinger.use_smart_90_for_video
  • ro.surface_flinger.protected_contents
  • ro.surface_flinger.support_kernel_idle_timer

有關這些屬性的詳細信息,請參閱frameworks/native/services/surfaceflinger/sysprop/SurfaceFlingerProperties.sysprop

使用SurfaceFlingerProperties

在以下SurfaceFlingerProperties庫示例中,函數名稱在SurfaceFlingerProperties.syspropapi_name

cc_binary {
    name: "cc_client",
    srcs: ["baz.cpp"],
    shared_libs: ["SurfaceFlingerProperties"],
}
java_library {
    name: "JavaClient",
    srcs: ["foo/bar.java"],
    libs: ["SurfaceFlingerProperties"],
}
import android.sysprop.SurfaceFlingerProperties;
...

static void foo() {
    ...
    boolean temp = SurfaceFlingerProperties.vsync_event_phase_offset_ns().orElse(true);
    ...
}
...
#include <SurfaceFlingerProperties.sysprop.h>
using namespace android::sysprop;

...

void bar() {
    ...
    bool temp = SurfaceFlingerProperties::vsync_event_phase_offset_ns(true);
    ...
}
...