Added smarter logic for understand that need restart camera or preview when we switch mode

cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java

@@ -159,7 +159,6 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
     @SuppressWarnings({"FieldCanBeLocal", "unused"})
     private boolean mExperimental;
     private boolean mInEditor;
-    private boolean mChangeModeWithoutRestart;
 
     // Overlays
     @VisibleForTesting OverlayLayout mOverlayLayout;
@@ -870,15 +869,6 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
         mExperimental = experimental;
     }
 
-    /**
-     * Sets the flag if you want disable restart camera on change mode (Photo/Video),
-     * but only for {@link Engine#CAMERA1}
-     * @param changeModeWithoutRestart - true if you want disable restart
-     */
-    public void setChangeModeWithoutRestart(boolean changeModeWithoutRestart) {
-        mChangeModeWithoutRestart = changeModeWithoutRestart;
-    }
-
     /**
      * Shorthand for the appropriate set* method.
      * For example, if control is a {@link Grid}, this calls {@link #setGrid(Grid)}.
@@ -1430,7 +1420,7 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
      * @param mode desired session type.
      */
     public void setMode(@NonNull Mode mode) {
-        mCameraEngine.setMode(mode, mChangeModeWithoutRestart);
+        mCameraEngine.setMode(mode);
     }
 
     /**

cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera1Engine.java

@@ -148,12 +148,28 @@ public class Camera1Engine extends CameraBaseEngine implements
     @EngineThread
     @Override
     protected void prepareNewMode() {
-        mCaptureSize = computeCaptureSize();
+        if(previewAspectRatioEqualsForModes()) {
             Camera.Parameters params = mCamera.getParameters();
             setPictureSize(params);
             applyDefaultFocus(params);
             params.setRecordingHint(getMode() == Mode.VIDEO);
             mCamera.setParameters(params);
+        } else {
+            restartBind();
+        }
+    }
+
+    private boolean previewAspectRatioEqualsForModes() {
+        Size prevModeSize = mCaptureSize;
+        mCaptureSize = computeCaptureSize();
+
+        boolean flip = getAngles().flip(Reference.SENSOR, Reference.VIEW);
+        AspectRatio prevModePreviewTargetRatio = AspectRatio.of(prevModeSize.getWidth(), prevModeSize.getHeight());
+        AspectRatio targetRatio = AspectRatio.of(mCaptureSize.getWidth(), mCaptureSize.getHeight());
+        if (flip) prevModePreviewTargetRatio = prevModePreviewTargetRatio.flip();
+        if (flip) targetRatio = targetRatio.flip();
+
+        return prevModePreviewTargetRatio.equals(targetRatio);
     }
 
     //endregion

cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera2Engine.java

@@ -393,7 +393,7 @@ public class Camera2Engine extends CameraBaseEngine implements
     @Override
     protected void prepareNewMode() {
         LOG.w("prepareNewMode:", "can't prepare new mode without restart for Engine2");
-        restart();
+        restartBind();
     }
 
     //endregion

cameraview/src/main/java/com/otaliastudios/cameraview/engine/CameraBaseEngine.java

@@ -384,18 +384,14 @@ public abstract class CameraBaseEngine extends CameraEngine {
      * @param mode desired mode.
      */
     @Override
-    public final void setMode(@NonNull Mode mode, final boolean withoutRestart) {
+    public final void setMode(@NonNull Mode mode) {
         if (mode != mMode) {
             mMode = mode;
             getOrchestrator().scheduleStateful("mode", CameraState.ENGINE,
                     new Runnable() {
                 @Override
                 public void run() {
-                    if (withoutRestart) {
                     prepareNewMode();
-                    } else {
-                        restart();
-                    }
                 }
             });
         }

cameraview/src/main/java/com/otaliastudios/cameraview/engine/CameraEngine.java

@@ -664,7 +664,7 @@ public abstract class CameraEngine implements
     public abstract void setAudio(@NonNull Audio audio);
     @NonNull public abstract Audio getAudio();
 
-    public abstract void setMode(@NonNull Mode mode, boolean withoutRestart);
+    public abstract void setMode(@NonNull Mode mode);
     @NonNull public abstract Mode getMode();
 
     public abstract void setZoom(float zoom, @Nullable PointF[] points, boolean notify);