[Magnifier-29] Expose size and zoom in the API

The CL exposes the size and the zoom of the magnifier in the public API.
These are required for implementing a number of UX requests in WebView
and Chrome - see the two bugs referenced.

Also, the CL fixes a bug in the #getContent() TestApi, which was
returning the bitmap before (instead of after) scaling.

Bug: 70608551
Bug: 72314536
Test: atest CtsWidgetTestCases:android.widget.cts.MagnifierTest
Change-Id: Idc583b923010d7dca075b05b6f4dbafa74cfec1f
(cherry picked from commit e1b93ddcbd)
Merged-In: Idc583b923010d7dca075b05b6f4dbafa74cfec1f

api/current.txt

@@ -53391,6 +53391,9 @@ package android.widget {
   public final class Magnifier {
     ctor public Magnifier(android.view.View);
     method public void dismiss();
+    method public int getHeight();
+    method public int getWidth();
+    method public float getZoom();
     method public void show(float, float);
     method public void update();
   }

core/java/android/widget/Magnifier.java

@@ -75,6 +75,8 @@ public final class Magnifier {
     private final int mWindowWidth;
     // The height of the window containing the magnifier.
     private final int mWindowHeight;
+    // The zoom applied to the view region copied to the magnifier window.
+    private final float mZoom;
     // The width of the bitmaps where the magnifier content is copied.
     private final int mBitmapWidth;
     // The height of the bitmaps where the magnifier content is copied.
@@ -111,10 +113,10 @@ public final class Magnifier {
                 com.android.internal.R.dimen.magnifier_height);
         mWindowElevation = context.getResources().getDimension(
                 com.android.internal.R.dimen.magnifier_elevation);
-        final float zoomScale = context.getResources().getFloat(
+        mZoom = context.getResources().getFloat(
                 com.android.internal.R.dimen.magnifier_zoom_scale);
-        mBitmapWidth = Math.round(mWindowWidth / zoomScale);
-        mBitmapHeight = Math.round(mWindowHeight / zoomScale);
+        mBitmapWidth = Math.round(mWindowWidth / mZoom);
+        mBitmapHeight = Math.round(mWindowHeight / mZoom);
         // The view's surface coordinates will not be updated until the magnifier is first shown.
         mViewCoordinatesInSurface = new int[2];
     }
@@ -187,21 +189,6 @@ public final class Magnifier {
         }
     }
 
-    @Nullable
-    private Surface getValidViewSurface() {
-        // TODO: deduplicate this against the first part of #performPixelCopy
-        final Surface surface;
-        if (mView instanceof SurfaceView) {
-            surface = ((SurfaceView) mView).getHolder().getSurface();
-        } else if (mView.getViewRootImpl() != null) {
-            surface = mView.getViewRootImpl().mSurface;
-        } else {
-            surface = null;
-        }
-
-        return (surface != null && surface.isValid()) ? surface : null;
-    }
-
     /**
      * Dismisses the magnifier from the screen. Calling this on a dismissed magnifier is a no-op.
      */
@@ -226,6 +213,44 @@ public final class Magnifier {
         }
     }
 
+    /**
+     * @return The width of the magnifier window, in pixels.
+     */
+    public int getWidth() {
+        return mWindowWidth;
+    }
+
+    /**
+     * @return The height of the magnifier window, in pixels.
+     */
+    public int getHeight() {
+        return mWindowHeight;
+    }
+
+    /**
+     * @return The zoom applied to the magnified view region copied to the magnifier window.
+     * If the zoom is x and the magnifier window size is (width, height), the original size
+     * of the content copied in the magnifier will be (width / x, height / x).
+     */
+    public float getZoom() {
+        return mZoom;
+    }
+
+    @Nullable
+    private Surface getValidViewSurface() {
+        // TODO: deduplicate this against the first part of #performPixelCopy
+        final Surface surface;
+        if (mView instanceof SurfaceView) {
+            surface = ((SurfaceView) mView).getHolder().getSurface();
+        } else if (mView.getViewRootImpl() != null) {
+            surface = mView.getViewRootImpl().mSurface;
+        } else {
+            surface = null;
+        }
+
+        return (surface != null && surface.isValid()) ? surface : null;
+    }
+
     private void configureCoordinates(final float xPosInView, final float yPosInView) {
         // Compute the coordinates of the center of the content going to be displayed in the
         // magnifier. These are relative to the surface the content is copied from.
@@ -602,7 +627,7 @@ public final class Magnifier {
             return null;
         }
         synchronized (mWindow.mLock) {
-            return mWindow.mBitmap;
+            return Bitmap.createScaledBitmap(mWindow.mBitmap, mWindowWidth, mWindowHeight, true);
         }
     }