/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.display;
import android.graphics.Rect;
import android.view.Display;
import android.view.DisplayInfo;
import android.view.Surface;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.List;
import libcore.util.Objects;
/**
* Describes how a logical display is configured.
* <p>
* At this time, we only support logical displays that are coupled to a particular
* primary display device from which the logical display derives its basic properties
* such as its size, density and refresh rate.
* </p><p>
* A logical display may be mirrored onto multiple display devices in addition to its
* primary display device. Note that the contents of a logical display may not
* always be visible, even on its primary display device, such as in the case where
* the primary display device is currently mirroring content from a different
* logical display.
* </p><p>
* This object is designed to encapsulate as much of the policy of logical
* displays as possible. The idea is to make it easy to implement new kinds of
* logical displays mostly by making local changes to this class.
* </p><p>
* Note: The display manager architecture does not actually require logical displays
* to be associated with any individual display device. Logical displays and
* display devices are orthogonal concepts. Some mapping will exist between
* logical displays and display devices but it can be many-to-many and
* and some might have no relation at all.
* </p><p>
* Logical displays are guarded by the {@link DisplayManagerService.SyncRoot} lock.
* </p>
*/
final class LogicalDisplay {
private final DisplayInfo mBaseDisplayInfo = new DisplayInfo();
// The layer stack we use when the display has been blanked to prevent any
// of its content from appearing.
private static final int BLANK_LAYER_STACK = -1;
private final int mDisplayId;
private final int mLayerStack;
private DisplayInfo mOverrideDisplayInfo; // set by the window manager
private DisplayInfo mInfo;
// The display device that this logical display is based on and which
// determines the base metrics that it uses.
private DisplayDevice mPrimaryDisplayDevice;
private DisplayDeviceInfo mPrimaryDisplayDeviceInfo;
// True if the logical display has unique content.
private boolean mHasContent;
// The pending requested refresh rate. 0 if no request is pending.
private float mRequestedRefreshRate;
// Temporary rectangle used when needed.
private final Rect mTempLayerStackRect = new Rect();
private final Rect mTempDisplayRect = new Rect();
public LogicalDisplay(int displayId, int layerStack, DisplayDevice primaryDisplayDevice) {
mDisplayId = displayId;
mLayerStack = layerStack;
mPrimaryDisplayDevice = primaryDisplayDevice;
}
/**
* Gets the logical display id of this logical display.
*
* @return The logical display id.
*/
public int getDisplayIdLocked() {
return mDisplayId;
}
/**
* Gets the primary display device associated with this logical display.
*
* @return The primary display device.
*/
public DisplayDevice getPrimaryDisplayDeviceLocked() {
return mPrimaryDisplayDevice;
}
/**
* Gets information about the logical display.
*
* @return The device info, which should be treated as immutable by the caller.
* The logical display should allocate a new display info object whenever
* the data changes.
*/
public DisplayInfo getDisplayInfoLocked() {
if (mInfo == null) {
mInfo = new DisplayInfo();
if (mOverrideDisplayInfo != null) {
mInfo.copyFrom(mOverrideDisplayInfo);
mInfo.layerStack = mBaseDisplayInfo.layerStack;
mInfo.name = mBaseDisplayInfo.name;
mInfo.uniqueId = mBaseDisplayInfo.uniqueId;
mInfo.state = mBaseDisplayInfo.state;
} else {
mInfo.copyFrom(mBaseDisplayInfo);
}
}
return mInfo;
}
/**
* Sets overridden logical display information from the window manager.
* This method can be used to adjust application insets, rotation, and other
* properties that the window manager takes care of.
*
* @param info The logical display information, may be null.
*/
public boolean setDisplayInfoOverrideFromWindowManagerLocked(DisplayInfo info) {
if (info != null) {
if (mOverrideDisplayInfo == null) {
mOverrideDisplayInfo = new DisplayInfo(info);
mInfo = null;
return true;
}
if (!mOverrideDisplayInfo.equals(info)) {
mOverrideDisplayInfo.copyFrom(info);
mInfo = null;
return true;
}
} else if (mOverrideDisplayInfo != null) {
mOverrideDisplayInfo = null;
mInfo = null;
return true;
}
return false;
}
/**
* Returns true if the logical display is in a valid state.
* This method should be checked after calling {@link #updateLocked} to handle the
* case where a logical display should be removed because all of its associated
* display devices are gone or if it is otherwise no longer needed.
*
* @return True if the logical display is still valid.
*/
public boolean isValidLocked() {
return mPrimaryDisplayDevice != null;
}
/**
* Updates the state of the logical display based on the available display devices.
* The logical display might become invalid if it is attached to a display device
* that no longer exists.
*
* @param devices The list of all connected display devices.
*/
public void updateLocked(List<DisplayDevice> devices) {
// Nothing to update if already invalid.
if (mPrimaryDisplayDevice == null) {
return;
}
// Check whether logical display has become invalid.
if (!devices.contains(mPrimaryDisplayDevice)) {
mPrimaryDisplayDevice = null;
return;
}
// Bootstrap the logical display using its associated primary physical display.
// We might use more elaborate configurations later. It's possible that the
// configuration of several physical displays might be used to determine the
// logical display that they are sharing. (eg. Adjust size for pixel-perfect
// mirroring over HDMI.)
DisplayDeviceInfo deviceInfo = mPrimaryDisplayDevice.getDisplayDeviceInfoLocked();
if (!Objects.equal(mPrimaryDisplayDeviceInfo, deviceInfo)) {
mBaseDisplayInfo.layerStack = mLayerStack;
mBaseDisplayInfo.flags = 0;
if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_SUPPORTS_PROTECTED_BUFFERS) != 0) {
mBaseDisplayInfo.flags |= Display.FLAG_SUPPORTS_PROTECTED_BUFFERS;
}
if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_SECURE) != 0) {
mBaseDisplayInfo.flags |= Display.FLAG_SECURE;
}
if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_PRIVATE) != 0) {
mBaseDisplayInfo.flags |= Display.FLAG_PRIVATE;
}
if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_PRESENTATION) != 0) {
mBaseDisplayInfo.flags |= Display.FLAG_PRESENTATION;
}
mBaseDisplayInfo.type = deviceInfo.type;
mBaseDisplayInfo.address = deviceInfo.address;
mBaseDisplayInfo.name = deviceInfo.name;
mBaseDisplayInfo.uniqueId = deviceInfo.uniqueId;
mBaseDisplayInfo.appWidth = deviceInfo.width;
mBaseDisplayInfo.appHeight = deviceInfo.height;
mBaseDisplayInfo.logicalWidth = deviceInfo.width;
mBaseDisplayInfo.logicalHeight = deviceInfo.height;
mBaseDisplayInfo.rotation = Surface.ROTATION_0;
mBaseDisplayInfo.refreshRate = deviceInfo.refreshRate;
mBaseDisplayInfo.supportedRefreshRates = Arrays.copyOf(
deviceInfo.supportedRefreshRates, deviceInfo.supportedRefreshRates.length);
mBaseDisplayInfo.logicalDensityDpi = deviceInfo.densityDpi;
mBaseDisplayInfo.physicalXDpi = deviceInfo.xDpi;
mBaseDisplayInfo.physicalYDpi = deviceInfo.yDpi;
mBaseDisplayInfo.appVsyncOffsetNanos = deviceInfo.appVsyncOffsetNanos;
mBaseDisplayInfo.presentationDeadlineNanos = deviceInfo.presentationDeadlineNanos;
mBaseDisplayInfo.state = deviceInfo.state;
mBaseDisplayInfo.smallestNominalAppWidth = deviceInfo.width;
mBaseDisplayInfo.smallestNominalAppHeight = deviceInfo.height;
mBaseDisplayInfo.largestNominalAppWidth = deviceInfo.width;
mBaseDisplayInfo.largestNominalAppHeight = deviceInfo.height;
mBaseDisplayInfo.ownerUid = deviceInfo.ownerUid;
mBaseDisplayInfo.ownerPackageName = deviceInfo.ownerPackageName;
mPrimaryDisplayDeviceInfo = deviceInfo;
mInfo = null;
}
}
/**
* Applies the layer stack and transformation to the given display device
* so that it shows the contents of this logical display.
*
* We know that the given display device is only ever showing the contents of
* a single logical display, so this method is expected to blow away all of its
* transformation properties to make it happen regardless of what the
* display device was previously showing.
*
* The caller must have an open Surface transaction.
*
* The display device may not be the primary display device, in the case
* where the display is being mirrored.
*
* @param device The display device to modify.
* @param isBlanked True if the device is being blanked.
*/
public void configureDisplayInTransactionLocked(DisplayDevice device,
boolean isBlanked) {
final DisplayInfo displayInfo = getDisplayInfoLocked();
final DisplayDeviceInfo displayDeviceInfo = device.getDisplayDeviceInfoLocked();
// Set the layer stack.
device.setLayerStackInTransactionLocked(isBlanked ? BLANK_LAYER_STACK : mLayerStack);
// Set the refresh rate
device.requestRefreshRateLocked(mRequestedRefreshRate);
// Set the viewport.
// This is the area of the logical display that we intend to show on the
// display device. For now, it is always the full size of the logical display.
mTempLayerStackRect.set(0, 0, displayInfo.logicalWidth, displayInfo.logicalHeight);
// Set the orientation.
// The orientation specifies how the physical coordinate system of the display
// is rotated when the contents of the logical display are rendered.
int orientation = Surface.ROTATION_0;
if ((displayDeviceInfo.flags & DisplayDeviceInfo.FLAG_ROTATES_WITH_CONTENT) != 0) {
orientation = displayInfo.rotation;
}
// Apply the physical rotation of the display device itself.
orientation = (orientation + displayDeviceInfo.rotation) % 4;
// Set the frame.
// The frame specifies the rotated physical coordinates into which the viewport
// is mapped. We need to take care to preserve the aspect ratio of the viewport.
// Currently we maximize the area to fill the display, but we could try to be
// more clever and match resolutions.
boolean rotated = (orientation == Surface.ROTATION_90
|| orientation == Surface.ROTATION_270);
int physWidth = rotated ? displayDeviceInfo.height : displayDeviceInfo.width;
int physHeight = rotated ? displayDeviceInfo.width : displayDeviceInfo.height;
// Determine whether the width or height is more constrained to be scaled.
// physWidth / displayInfo.logicalWidth => letter box
// or physHeight / displayInfo.logicalHeight => pillar box
//
// We avoid a division (and possible floating point imprecision) here by
// multiplying the fractions by the product of their denominators before
// comparing them.
int displayRectWidth, displayRectHeight;
if (physWidth * displayInfo.logicalHeight
< physHeight * displayInfo.logicalWidth) {
// Letter box.
displayRectWidth = physWidth;
displayRectHeight = displayInfo.logicalHeight * physWidth / displayInfo.logicalWidth;
} else {
// Pillar box.
displayRectWidth = displayInfo.logicalWidth * physHeight / displayInfo.logicalHeight;
displayRectHeight = physHeight;
}
int displayRectTop = (physHeight - displayRectHeight) / 2;
int displayRectLeft = (physWidth - displayRectWidth) / 2;
mTempDisplayRect.set(displayRectLeft, displayRectTop,
displayRectLeft + displayRectWidth, displayRectTop + displayRectHeight);
device.setProjectionInTransactionLocked(orientation, mTempLayerStackRect, mTempDisplayRect);
}
/**
* Returns true if the logical display has unique content.
* <p>
* If the display has unique content then we will try to ensure that it is
* visible on at least its primary display device. Otherwise we will ignore the
* logical display and perhaps show mirrored content on the primary display device.
* </p>
*
* @return True if the display has unique content.
*/
public boolean hasContentLocked() {
return mHasContent;
}
/**
* Sets whether the logical display has unique content.
*
* @param hasContent True if the display has unique content.
*/
public void setHasContentLocked(boolean hasContent) {
mHasContent = hasContent;
}
/**
* Requests the given refresh rate.
* @param requestedRefreshRate The desired refresh rate.
*/
public void setRequestedRefreshRateLocked(float requestedRefreshRate) {
mRequestedRefreshRate = requestedRefreshRate;
}
/**
* Gets the pending requested refresh rate.
*
* @return The pending refresh rate requested
*/
public float getRequestedRefreshRateLocked() {
return mRequestedRefreshRate;
}
public void dumpLocked(PrintWriter pw) {
pw.println("mDisplayId=" + mDisplayId);
pw.println("mLayerStack=" + mLayerStack);
pw.println("mHasContent=" + mHasContent);
pw.println("mPrimaryDisplayDevice=" + (mPrimaryDisplayDevice != null ?
mPrimaryDisplayDevice.getNameLocked() : "null"));
pw.println("mBaseDisplayInfo=" + mBaseDisplayInfo);
pw.println("mOverrideDisplayInfo=" + mOverrideDisplayInfo);
}
}
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