SnapdragonCamera: Reduce the latency for panorama preview starting

In panorama mode preview, the stopPreview and startPreview were
called three times after onResume from lockscreen, that caused the
preview showing delay.

Reduce the unnecessary stopPreview to improve the preview performance.

CRs-Fixed: 876035
Change-Id: Ice5b0c305edb773867fd4803c190c98f5518ecb2

1 files changed, 8 insertions, 6 deletions

diff --git a/src/com/android/camera/WideAnglePanoramaModule.java b/src/com/android/camera/WideAnglePanoramaModule.java
index 7d378ce15..5f74adcf1 100644
--- a/src/com/android/camera/WideAnglePanoramaModule.java
+++ b/src/com/android/camera/WideAnglePanoramaModule.java
@@ -514,9 +514,6 @@ public class WideAnglePanoramaModule
             mMosaicPreviewRenderer = renderer;
             mCameraTexture = mMosaicPreviewRenderer.getInputSurfaceTexture();
 
-            if (!mPaused && !mThreadRunning && mWaitProcessorTask == null) {
-                mMainHandler.sendEmptyMessage(MSG_RESET_TO_PREVIEW);
-            }
             mRendererLock.notifyAll();
         }
         mMosaicPreviewConfigured = true;
@@ -534,9 +531,14 @@ public class WideAnglePanoramaModule
         if (mCaptureState == CAPTURE_STATE_MOSAIC){
             capturePending = true;
         }
-        mPreviewUIWidth = r - l;
-        mPreviewUIHeight = b - t;
-        configMosaicPreview();
+        int width = r -l;
+        int height = b - t;
+        if (mPreviewUIWidth != width || mPreviewUIHeight != height
+                || mCameraState != PREVIEW_ACTIVE) {
+            mPreviewUIWidth = r - l;
+            mPreviewUIHeight = b - t;
+            configMosaicPreview();
+        }
         if (capturePending == true){
             mMainHandler.post(new Runnable() {
                 @Override