Use custom drawable for Recents Go thumbnails (1/2)
In order to support rotated thumbnails based off the device orientation,
we should create a custom drawable that supports drawing a rotated
bitmap based off some requested orientation. This CL adds this class,
and we'll use it in a later CL.
By baking this directly into the drawable, we prevent unnecessary
allocations of rotated bitmaps.
Bug: 114136250
Bug: 131095241
Test: Builds
Change-Id: Ib4e83e3619028c583e10f1b8d743a365ec310346
(cherry picked from commit 518ff10856a60c9fe7a6ccdbd7e6c6a88cba3c6e)
diff --git a/go/quickstep/src/com/android/quickstep/ThumbnailDrawable.java b/go/quickstep/src/com/android/quickstep/ThumbnailDrawable.java
new file mode 100644
index 0000000..6ef9039
--- /dev/null
+++ b/go/quickstep/src/com/android/quickstep/ThumbnailDrawable.java
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2019 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.quickstep;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.ColorFilter;
+import android.graphics.Matrix;
+import android.graphics.Paint;
+import android.graphics.PixelFormat;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+
+import androidx.annotation.NonNull;
+
+import com.android.systemui.shared.recents.model.ThumbnailData;
+
+/**
+ * Bitmap backed drawable that supports rotating the thumbnail bitmap depending on if the
+ * orientation the thumbnail was taken in matches the desired orientation. In addition, the
+ * thumbnail always fills into the containing bounds.
+ */
+public final class ThumbnailDrawable extends Drawable {
+
+ private final Paint mPaint = new Paint();
+ private final Matrix mMatrix = new Matrix();
+ private final ThumbnailData mThumbnailData;
+ private int mRequestedOrientation;
+
+ public ThumbnailDrawable(@NonNull ThumbnailData thumbnailData, int requestedOrientation) {
+ mThumbnailData = thumbnailData;
+ mRequestedOrientation = requestedOrientation;
+ updateMatrix();
+ }
+
+ /**
+ * Set the requested orientation.
+ *
+ * @param orientation the orientation we want the thumbnail to be in
+ */
+ public void setRequestedOrientation(int orientation) {
+ if (mRequestedOrientation != orientation) {
+ mRequestedOrientation = orientation;
+ updateMatrix();
+ }
+ }
+
+ @Override
+ public void draw(Canvas canvas) {
+ if (mThumbnailData.thumbnail == null) {
+ return;
+ }
+ canvas.drawBitmap(mThumbnailData.thumbnail, mMatrix, mPaint);
+ }
+
+ @Override
+ protected void onBoundsChange(Rect bounds) {
+ super.onBoundsChange(bounds);
+ updateMatrix();
+ }
+
+ @Override
+ public void setAlpha(int alpha) {
+ final int oldAlpha = mPaint.getAlpha();
+ if (alpha != oldAlpha) {
+ mPaint.setAlpha(alpha);
+ invalidateSelf();
+ }
+ }
+
+ @Override
+ public int getAlpha() {
+ return mPaint.getAlpha();
+ }
+
+ @Override
+ public void setColorFilter(ColorFilter colorFilter) {
+ mPaint.setColorFilter(colorFilter);
+ invalidateSelf();
+ }
+
+ @Override
+ public ColorFilter getColorFilter() {
+ return mPaint.getColorFilter();
+ }
+
+ @Override
+ public int getOpacity() {
+ return PixelFormat.TRANSLUCENT;
+ }
+
+ private void updateMatrix() {
+ if (mThumbnailData.thumbnail == null) {
+ return;
+ }
+ mMatrix.reset();
+ float scaleX;
+ float scaleY;
+ Rect bounds = getBounds();
+ Bitmap thumbnail = mThumbnailData.thumbnail;
+ if (mRequestedOrientation != mThumbnailData.orientation) {
+ // Rotate and translate so that top left is the same.
+ mMatrix.postRotate(90, 0, 0);
+ mMatrix.postTranslate(thumbnail.getHeight(), 0);
+
+ scaleX = (float) bounds.width() / thumbnail.getHeight();
+ scaleY = (float) bounds.height() / thumbnail.getWidth();
+ } else {
+ scaleX = (float) bounds.width() / thumbnail.getWidth();
+ scaleY = (float) bounds.height() / thumbnail.getHeight();
+ }
+ // Scale to fill.
+ mMatrix.postScale(scaleX, scaleY);
+ }
+}