Android HDMI
显示器接口VGA、DVI、HDMI、DP
Android R DisplayManagerService模块
常用显示器接口
图片来自绿联
VGA: Video Graphics Array 视频图形阵列, 模拟信号, 液晶显示器需要 A/D转换器，模拟信号抗干扰能力差，不适合超高清显示，一般用在1080p以内
HDMI: High Definition Multimedia Interface 高清多媒体接口, 全数字化视频和声音发送接口, 最新的HDMI2.1带宽达48Gbps，可以支持2K 240hz、4K 144hz、5K 60hz、8K 30hz
DP: DisplayPort 数字高清接口, 最新的DP2.0带宽已经高达80Gbps，最大支持16K（15360*8460）的超强分辨率
RK3288 dts
&hdmi {
status = "okay";
};
&route_hdmi {
status = "okay";
}
显示器类型
public final class DisplayManagerService extends SystemService {
// List of all currently registered display adapters.
private final ArrayList
// List of all currently connected display devices.
private final ArrayList
// List of all logical displays indexed by logical display id.
private final SparseArray
new SparseArray
}
// 用于LocalDisplayDevice和DMS的连接
final class LocalDisplayAdapter extends DisplayAdapter {
private final SparseArray
new SparseArray
}
// 物理屏幕
abstract class DisplayDevice {
private final DisplayAdapter mDisplayAdapter;
}
// 内置物理屏幕
private final class LocalDisplayDevice extends DisplayDevice {
private final int mBuiltInDisplayId;
private DisplayDeviceInfo mInfo;
}
// 开发者选项->模拟辅助显示开启后，创建的就是该类对象
private abstract class OverlayDisplayDevice extends DisplayDevice {
private DisplayDeviceInfo mInfo;
}
// 表示虚拟显示屏幕，用于屏幕录制等
private final class VirtualDisplayDevice extends DisplayDevice implements DeathRecipient {
private DisplayDeviceInfo mInfo;
}
// 通过Wifi连接显示的物理屏幕
private final class WifiDisplayDevice extends DisplayDevice {
private Surface mSurface;
private DisplayDeviceInfo mInfo;
}
// 表逻辑显示屏，每一个physical display都会对应一个logical display
final class LogicalDisplay {
private DisplayInfo mOverrideDisplayInfo; // set by the window manager
public DisplayInfo mInfo;
}
// DisplayDevice信息封装类，在创建DisplayDevice时会进行创建，与之对应的是Logical display 的DisplayInfo；
final class DisplayDeviceInfo {
public int rotation = Surface.ROTATION_0;
}
// LogicalDisplay信息的封装类，基本数据由DisplayDeviceInfo中获得，app可以通过WMS来修改自己的参数；
public final class DisplayInfo implements Parcelable {
@Surface.Rotation
public int rotation;
}
RK3288 HDMI 旋转
属性值
含义
ro.sf.hwrotation
主屏初始方向
ro.orientation.einit
副屏初始方向
ro.same.orientation
主副屏方向是否相同
ro.rotation.external
副屏是否随主屏旋转
persist.orientation.vhinit
DisplayDeviceInfo 描述一个物理屏幕默认方向
persist.demo.hdmirotation
LocalDisplayAdapter 外部显示器默认方向
persist.demo.hdmirotates
DisplayDeviceInfo.FLAG_ROTATES_WITH_CONTENT 显示和设备的方向和逻辑显示的方向一致
sys.hwc.device.main
查询当前主屏幕显示的输出接口
sys.hwc.device.aux
查询当前副屏幕显示的输出接口
sys.hwc.device.primary
设置显示接口作为主显
sys.hwc.device.extend
设置显示接口作为副显
persist.sys.framebuffer.main
设置分辨率 1920x1080
FAQ
RK3288 修改外部HDMI显示器的默认显示方向为竖屏
persist.demo.hdmirotates=true
persist.demo.hdmirotation=portrait
persist.orientation.vhinit=1
rk3588 HDMI 显示器方向修改
persist.sys.rotation.einit-1=1 // HDMI 竖屏显示
persist.sys.rotation.efull-1=1 // HDMI 全屏显示
final class LogicalDisplay {
private static final String TAG = "LogicalDisplay";
public void updateLocked(DisplayDeviceRepository deviceRepo) {
--------------------------------------------------------------------------------
if (SystemProperties.get("ro.board.platform").equals("rk356x") ||
SystemProperties.get("ro.board.platform").equals("rk3588")) {
if (deviceInfo.type == Display.TYPE_EXTERNAL) {
int mPhysicalDisplayId = Integer.valueOf(deviceInfo.uniqueId.split(":")[1]);
String property = "persist.sys.rotation.einit-" + mPhysicalDisplayId;
if (SystemProperties.getInt(property, 0) % 2 != 0) {
mBaseDisplayInfo.appWidth = deviceInfo.height;
mBaseDisplayInfo.appHeight = deviceInfo.width;
mBaseDisplayInfo.logicalWidth = deviceInfo.height;
mBaseDisplayInfo.logicalHeight = deviceInfo.width;
}
}
} else {
if (deviceInfo.type == Display.TYPE_EXTERNAL) {
if (SystemProperties.getInt("persist.sys.rotation.einit", 0) % 2 != 0) {
mBaseDisplayInfo.appWidth = deviceInfo.height;
mBaseDisplayInfo.appHeight = deviceInfo.width;
mBaseDisplayInfo.logicalWidth = deviceInfo.height;
mBaseDisplayInfo.logicalHeight = deviceInfo.width;
}
}
}
---------------------------------------------------------------------------------
}
public void configureDisplayLocked(SurfaceControl.Transaction t,
DisplayDevice device,
boolean isBlanked) {
--------------------------------------------------------------------------------------
if (SystemProperties.get("ro.board.platform").equals("rk356x")||SystemProperties.get("ro.board.platform").equals("rk3588")) {
if (displayDeviceInfo.type == Display.TYPE_EXTERNAL) {
int mPhysicalDisplayId = Integer.valueOf(device.getDisplayDeviceInfoLocked().uniqueId.split(":")[1]);
String property="persist.sys.rotation.efull-"+mPhysicalDisplayId;
if (SystemProperties.getBoolean(property, false)) {
mTempDisplayRect.top = 0;
mTempDisplayRect.left = 0;
mTempDisplayRect.right = physWidth;
mTempDisplayRect.bottom = physHeight;
}
}
} else {
if (device.getDisplayDeviceInfoLocked().type == Display.TYPE_EXTERNAL) {
if (SystemProperties.getBoolean("persist.sys.rotation.efull", false)) {
mTempDisplayRect.top = 0;
mTempDisplayRect.left = 0;
mTempDisplayRect.right = physWidth;
mTempDisplayRect.bottom = physHeight;
}
}
}
--------------------------------------------------------------------------------------
}
}
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