Reduce amount of garbage created when flipping StackViews
diff --git a/core/java/android/widget/StackView.java b/core/java/android/widget/StackView.java
index 432dd4a..e2d78c0 100644
--- a/core/java/android/widget/StackView.java
+++ b/core/java/android/widget/StackView.java
@@ -100,6 +100,8 @@
private static final int FRAME_PADDING = 4;
+ private final Rect mTouchRect = new Rect();
+
/**
* These variables are all related to the current state of touch interaction
* with the stack
@@ -531,7 +533,6 @@
return true;
}
- private final Rect touchRect = new Rect();
private void onSecondaryPointerUp(MotionEvent ev) {
final int activePointerIndex = ev.getActionIndex();
final int pointerId = ev.getPointerId(activePointerIndex);
@@ -552,8 +553,8 @@
float x = ev.getX(index);
float y = ev.getY(index);
- touchRect.set(v.getLeft(), v.getTop(), v.getRight(), v.getBottom());
- if (touchRect.contains(Math.round(x), Math.round(y))) {
+ mTouchRect.set(v.getLeft(), v.getTop(), v.getRight(), v.getBottom());
+ if (mTouchRect.contains(Math.round(x), Math.round(y))) {
float oldX = ev.getX(activePointerIndex);
float oldY = ev.getY(activePointerIndex);
@@ -1049,18 +1050,23 @@
private static final int RES_OUT = 0;
private static final int CLICK_FEEDBACK = 1;
private float mDensity;
+ private BlurMaskFilter mSmallBlurMaskFilter;
+ private BlurMaskFilter mLargeBlurMaskFilter;
+ private final Canvas mCanvas = new Canvas();
+ private final Canvas mMaskCanvas = new Canvas();
+ private final int[] mTmpXY = new int[2];
+ private final Matrix mIdentityMatrix = new Matrix();
HolographicHelper(Context context) {
- initializePaints(context);
- }
-
- void initializePaints(Context context) {
mDensity = context.getResources().getDisplayMetrics().density;
mHolographicPaint.setFilterBitmap(true);
mHolographicPaint.setMaskFilter(TableMaskFilter.CreateClipTable(0, 30));
mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
mErasePaint.setFilterBitmap(true);
+
+ mSmallBlurMaskFilter = new BlurMaskFilter(2 * mDensity, BlurMaskFilter.Blur.NORMAL);
+ mLargeBlurMaskFilter = new BlurMaskFilter(4 * mDensity, BlurMaskFilter.Blur.NORMAL);
}
Bitmap createOutline(View v) {
@@ -1070,10 +1076,10 @@
Bitmap createOutline(View v, int type) {
if (type == RES_OUT) {
mHolographicPaint.setColor(0xff6699ff);
- mBlurPaint.setMaskFilter(new BlurMaskFilter(2*mDensity, BlurMaskFilter.Blur.NORMAL));
+ mBlurPaint.setMaskFilter(mSmallBlurMaskFilter);
} else if (type == CLICK_FEEDBACK) {
mHolographicPaint.setColor(0x886699ff);
- mBlurPaint.setMaskFilter(new BlurMaskFilter(4*mDensity, BlurMaskFilter.Blur.NORMAL));
+ mBlurPaint.setMaskFilter(mLargeBlurMaskFilter);
}
if (v.getMeasuredWidth() == 0 || v.getMeasuredHeight() == 0) {
@@ -1082,7 +1088,7 @@
Bitmap bitmap = Bitmap.createBitmap(v.getMeasuredWidth(), v.getMeasuredHeight(),
Bitmap.Config.ARGB_8888);
- Canvas canvas = new Canvas(bitmap);
+ mCanvas.setBitmap(bitmap);
float rotationX = v.getRotationX();
float rotation = v.getRotation();
@@ -1090,23 +1096,22 @@
v.setRotationX(0);
v.setRotation(0);
v.setTranslationY(0);
- v.draw(canvas);
+ v.draw(mCanvas);
v.setRotationX(rotationX);
v.setRotation(rotation);
v.setTranslationY(translationY);
- drawOutline(canvas, bitmap);
+ drawOutline(mCanvas, bitmap);
return bitmap;
}
- final Matrix id = new Matrix();
void drawOutline(Canvas dest, Bitmap src) {
- int[] xy = new int[2];
+ final int[] xy = mTmpXY;
Bitmap mask = src.extractAlpha(mBlurPaint, xy);
- Canvas maskCanvas = new Canvas(mask);
- maskCanvas.drawBitmap(src, -xy[0], -xy[1], mErasePaint);
+ mMaskCanvas.setBitmap(mask);
+ mMaskCanvas.drawBitmap(src, -xy[0], -xy[1], mErasePaint);
dest.drawColor(0, PorterDuff.Mode.CLEAR);
- dest.setMatrix(id);
+ dest.setMatrix(mIdentityMatrix);
dest.drawBitmap(mask, xy[0], xy[1], mHolographicPaint);
mask.recycle();
}