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Commit 6b45e555 authored by wilsonshih's avatar wilsonshih
Browse files

Persist high-resolution snapshots using lossless compression 

The lossless compression approach provides more reliable results
against the HumanEyeMatcher comparison method.

Flag: com.android.window.flags.respect_requested_task_snapshot_resolution
Bug: 438072503
Test: nexus_image_test_platform
Change-Id: I9b736d2a444587b20fe8b82464805f568106981c
parent 2c325801

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

+3 −1
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
package com.android.server.wm;



import static android.graphics.Bitmap.CompressFormat.JPEG;

import static android.graphics.Bitmap.CompressFormat.PNG;

import static android.os.Trace.TRACE_TAG_WINDOW_MANAGER;



import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME;
@@ -509,7 +510,8 @@ class SnapshotPersistQueue { 


            final File lowResFile = mPersistInfoProvider.getLowResolutionBitmapFile(mId, mUserId);

            try (FileOutputStream lowResFos = new FileOutputStream(lowResFile)) {

                lowResBitmap.compress(JPEG, COMPRESS_QUALITY, lowResFos);

                lowResBitmap.compress(Flags.respectRequestedTaskSnapshotResolution() ? PNG : JPEG,

                        COMPRESS_QUALITY, lowResFos);

            } catch (IOException e) {

                Slog.e(TAG, "Unable to open " + lowResFile + " for persisting.", e);

                return false;