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Commit 5387341d authored by Saurabh Shah's avatar Saurabh Shah Committed by Steve Kondik
Browse files

frameworks/base: Add support for fully transparent layers 

Allow apps to specify a window to be fully transparent. This hint
can be used later by the compositor to drop the layer.

Change-Id: Ib58f1026e74ca39e7160d2adcb34ebf50ec28a9a
parent 06f2cac3

core/java/android/view/SurfaceControl.java

+15 −0
Original line number Diff line number Diff line
@@ -199,6 +199,11 @@ public class SurfaceControl { 
     */

    private static final int SURFACE_OPAQUE = 0x02;



    /**

     * Surface flag: Fully transparent, drop in composition if possible

     * @hide

     */

    private static final int SURFACE_TRANSPARENT = 0x80;



    /* built-in physical display ids (keep in sync with ISurfaceComposer.h)

     * these are different from the logical display ids used elsewhere in the framework */
@@ -388,6 +393,16 @@ public class SurfaceControl { 
        nativeSetFlags(mNativeObject, 0, SURFACE_HIDDEN);

    }



    public void setTransparent(boolean isTransparent) {

        checkNotReleased();

        if(isTransparent) {

            nativeSetFlags(mNativeObject, SURFACE_TRANSPARENT,

                    SURFACE_TRANSPARENT);

        } else {

            nativeSetFlags(mNativeObject, 0, SURFACE_TRANSPARENT);

        }

    }



    public void setTransparentRegionHint(Region region) {

        checkNotReleased();

        nativeSetTransparentRegionHint(mNativeObject, region);

core/java/android/view/Window.java

+5 −0
Original line number Diff line number Diff line
@@ -779,6 +779,11 @@ public abstract class Window { 
        setFlags(0, flags);

    }



    /** @hide */

    public void clearPrivateFlags(int flags) {

        setPrivateFlags(0, flags);

    }



    /**

     * Set the flags of the window, as per the

     * {@link WindowManager.LayoutParams WindowManager.LayoutParams}

core/java/android/view/WindowManager.java

+4 −0
Original line number Diff line number Diff line
@@ -1115,6 +1115,10 @@ public interface WindowManager extends ViewManager { 
         */

        public static final int PRIVATE_FLAG_KEYGUARD = 0x00000400;



        /** Window flag: mark layer as fully transparent

         * {@hide} */

        public static final int PRIVATE_FLAG_FULLY_TRANSPARENT = 0x10000000;



        /**

         * Control flags that are private to the platform.

         * @hide

services/core/java/com/android/server/wm/WindowManagerService.java

+8 −0
Original line number Diff line number Diff line
@@ -9430,6 +9430,12 @@ public class WindowManagerService extends IWindowManager.Stub 
        }

    }



    private void handlePrivateFlagFullyTransparent(WindowState w) {

        final WindowManager.LayoutParams attrs = w.mAttrs;

        final WindowStateAnimator winAnimator = w.mWinAnimator;

        winAnimator.updateFullyTransparent(attrs);

    }



    private void updateAllDrawnLocked(DisplayContent displayContent) {

        // See if any windows have been drawn, so they (and others

        // associated with them) can now be shown.
@@ -9631,6 +9637,8 @@ public class WindowManagerService extends IWindowManager.Stub 
                        handleFlagDimBehind(w);

                    }



                    handlePrivateFlagFullyTransparent(w);



                    if (isDefaultDisplay && obscuredChanged && (mWallpaperTarget == w)

                            && w.isVisibleLw()) {

                        // This is the wallpaper target and its obscured state

services/core/java/com/android/server/wm/WindowStateAnimator.java

+17 −0
Original line number Diff line number Diff line
@@ -96,6 +96,7 @@ class WindowStateAnimator { 
    boolean mWasAnimating;      // Were we animating going into the most recent animation step?

    int mAnimLayer;

    int mLastLayer;

    boolean mFullyTransparent; //Last value of transparency setting



    SurfaceControl mSurfaceControl;

    SurfaceControl mPendingDestroySurface;
@@ -1901,4 +1902,20 @@ class WindowStateAnimator { 
        sb.append('}');

        return sb.toString();

    }



    void updateFullyTransparent(WindowManager.LayoutParams attrs) {

        final boolean fullyTransparent = (attrs.privateFlags &

                WindowManager.LayoutParams.PRIVATE_FLAG_FULLY_TRANSPARENT) != 0;

        if (fullyTransparent == mFullyTransparent) return;

        if (mSurfaceControl == null) return;

        SurfaceControl.openTransaction();

        try {

            mSurfaceControl.setTransparent(fullyTransparent);

        } catch (RuntimeException e) {

            Slog.w(TAG, "Error toggling transparency. ", e);

        } finally {

            SurfaceControl.closeTransaction();

            mFullyTransparent = fullyTransparent;

        }

    }

}