Camera2 API: fix front facing camera flip issue

Camera stream transform calculation should take camera facing into account.
For example, front facing camera preview stream should be horizontally or
vertically flipped.

Bug: 12300670
Change-Id: Ib497f0b8c3e65974de05d4f0aca3c51e99717c3d

1 files changed, 47 insertions, 17 deletions

diff --git a/services/camera/libcameraservice/api2/CameraDeviceClient.cpp b/services/camera/libcameraservice/api2/CameraDeviceClient.cpp
index 1cdf8dc..187220e 100644
--- a/services/camera/libcameraservice/api2/CameraDeviceClient.cpp
+++ b/services/camera/libcameraservice/api2/CameraDeviceClient.cpp
@@ -635,26 +635,56 @@ status_t CameraDeviceClient::getRotationTransformLocked(int32_t* transform) {
         return INVALID_OPERATION;
     }
 
+    camera_metadata_ro_entry_t entryFacing = staticInfo.find(ANDROID_LENS_FACING);
+    if (entry.count == 0) {
+        ALOGE("%s: Camera %d: Can't find android.lens.facing in "
+                "static metadata!", __FUNCTION__, mCameraId);
+        return INVALID_OPERATION;
+    }
+
     int32_t& flags = *transform;
 
+    bool mirror = (entryFacing.data.u8[0] == ANDROID_LENS_FACING_FRONT);
     int orientation = entry.data.i32[0];
-    switch (orientation) {
-        case 0:
-            flags = 0;
-            break;
-        case 90:
-            flags = NATIVE_WINDOW_TRANSFORM_ROT_90;
-            break;
-        case 180:
-            flags = NATIVE_WINDOW_TRANSFORM_ROT_180;
-            break;
-        case 270:
-            flags = NATIVE_WINDOW_TRANSFORM_ROT_270;
-            break;
-        default:
-            ALOGE("%s: Invalid HAL android.sensor.orientation value: %d",
-                  __FUNCTION__, orientation);
-            return INVALID_OPERATION;
+    if (!mirror) {
+        switch (orientation) {
+            case 0:
+                flags = 0;
+                break;
+            case 90:
+                flags = NATIVE_WINDOW_TRANSFORM_ROT_90;
+                break;
+            case 180:
+                flags = NATIVE_WINDOW_TRANSFORM_ROT_180;
+                break;
+            case 270:
+                flags = NATIVE_WINDOW_TRANSFORM_ROT_270;
+                break;
+            default:
+                ALOGE("%s: Invalid HAL android.sensor.orientation value: %d",
+                      __FUNCTION__, orientation);
+                return INVALID_OPERATION;
+        }
+    } else {
+        switch (orientation) {
+            case 0:
+                flags = HAL_TRANSFORM_FLIP_H;
+                break;
+            case 90:
+                flags = HAL_TRANSFORM_FLIP_H | HAL_TRANSFORM_ROT_90;
+                break;
+            case 180:
+                flags = HAL_TRANSFORM_FLIP_V;
+                break;
+            case 270:
+                flags = HAL_TRANSFORM_FLIP_V | HAL_TRANSFORM_ROT_90;
+                break;
+            default:
+                ALOGE("%s: Invalid HAL android.sensor.orientation value: %d",
+                      __FUNCTION__, orientation);
+                return INVALID_OPERATION;
+        }
+
     }
 
     /**