| /* |
| * Copyright (C) 2014 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.wm; |
| |
| |
| |
| import android.graphics.Canvas; |
| import android.graphics.Color; |
| import android.graphics.Paint; |
| import android.graphics.PixelFormat; |
| import android.graphics.Point; |
| import android.graphics.PorterDuff; |
| import android.graphics.PorterDuffXfermode; |
| import android.graphics.Rect; |
| import android.view.Display; |
| import android.view.Surface; |
| import android.view.Surface.OutOfResourcesException; |
| import android.view.SurfaceControl; |
| import android.view.SurfaceSession; |
| import android.util.Slog; |
| |
| class CircularDisplayMask { |
| private static final String TAG = "CircularDisplayMask"; |
| |
| // size of the chin |
| private int mScreenOffset = 0; |
| // Display dimensions |
| private Point mScreenSize; |
| |
| private final SurfaceControl mSurfaceControl; |
| private final Surface mSurface = new Surface(); |
| private int mLastDW; |
| private int mLastDH; |
| private boolean mDrawNeeded; |
| private Paint mPaint; |
| private int mRotation; |
| private boolean mVisible; |
| private boolean mDimensionsUnequal = false; |
| |
| public CircularDisplayMask(Display display, SurfaceSession session, int zOrder, |
| int screenOffset) { |
| mScreenSize = new Point(); |
| display.getSize(mScreenSize); |
| if (mScreenSize.x != mScreenSize.y) { |
| Slog.w(TAG, "Screen dimensions of displayId = " + display.getDisplayId() + |
| "are not equal, circularMask will not be drawn."); |
| mDimensionsUnequal = true; |
| } |
| |
| SurfaceControl ctrl = null; |
| try { |
| if (WindowManagerService.DEBUG_SURFACE_TRACE) { |
| ctrl = new WindowStateAnimator.SurfaceTrace(session, "CircularDisplayMask", |
| mScreenSize.x, mScreenSize.y, PixelFormat.TRANSLUCENT, |
| SurfaceControl.HIDDEN); |
| } else { |
| ctrl = new SurfaceControl(session, "CircularDisplayMask", mScreenSize.x, |
| mScreenSize.y, PixelFormat.TRANSLUCENT, SurfaceControl.HIDDEN); |
| } |
| ctrl.setLayerStack(display.getLayerStack()); |
| ctrl.setLayer(zOrder); |
| ctrl.setPosition(0, 0); |
| ctrl.show(); |
| mSurface.copyFrom(ctrl); |
| } catch (OutOfResourcesException e) { |
| } |
| mSurfaceControl = ctrl; |
| mDrawNeeded = true; |
| mPaint = new Paint(); |
| mPaint.setAntiAlias(true); |
| mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR)); |
| mScreenOffset = screenOffset; |
| } |
| |
| private void drawIfNeeded() { |
| if (!mDrawNeeded || !mVisible || mDimensionsUnequal) { |
| return; |
| } |
| mDrawNeeded = false; |
| |
| Rect dirty = new Rect(0, 0, mScreenSize.x, mScreenSize.y); |
| Canvas c = null; |
| try { |
| c = mSurface.lockCanvas(dirty); |
| } catch (IllegalArgumentException e) { |
| } catch (Surface.OutOfResourcesException e) { |
| } |
| if (c == null) { |
| return; |
| } |
| switch (mRotation) { |
| case Surface.ROTATION_0: |
| case Surface.ROTATION_90: |
| // chin bottom or right |
| mSurfaceControl.setPosition(0, 0); |
| break; |
| case Surface.ROTATION_180: |
| // chin top |
| mSurfaceControl.setPosition(0, -mScreenOffset); |
| break; |
| case Surface.ROTATION_270: |
| // chin left |
| mSurfaceControl.setPosition(-mScreenOffset, 0); |
| break; |
| } |
| |
| int circleRadius = mScreenSize.x / 2; |
| c.drawColor(Color.BLACK); |
| |
| // The radius is reduced by 1 to provide an anti aliasing effect on the display edges. |
| c.drawCircle(circleRadius, circleRadius, circleRadius - 1, mPaint); |
| mSurface.unlockCanvasAndPost(c); |
| } |
| |
| // Note: caller responsible for being inside |
| // Surface.openTransaction() / closeTransaction() |
| public void setVisibility(boolean on) { |
| if (mSurfaceControl == null) { |
| return; |
| } |
| mVisible = on; |
| drawIfNeeded(); |
| if (on) { |
| mSurfaceControl.show(); |
| } else { |
| mSurfaceControl.hide(); |
| } |
| } |
| |
| void positionSurface(int dw, int dh, int rotation) { |
| if (mLastDW == dw && mLastDH == dh && mRotation == rotation) { |
| return; |
| } |
| mLastDW = dw; |
| mLastDH = dh; |
| mDrawNeeded = true; |
| mRotation = rotation; |
| drawIfNeeded(); |
| } |
| |
| } |