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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #define LOG_TAG "CameraUtils"
     18 //#define LOG_NDEBUG 0
     19 
     20 #include <camera/CameraUtils.h>
     21 
     22 #include <system/window.h>
     23 #include <system/graphics.h>
     24 
     25 #include <utils/Log.h>
     26 
     27 namespace android {
     28 
     29 status_t CameraUtils::getRotationTransform(const CameraMetadata& staticInfo,
     30                 /*out*/int32_t* transform) {
     31     ALOGV("%s", __FUNCTION__);
     32 
     33     if (transform == NULL) {
     34         ALOGW("%s: null transform", __FUNCTION__);
     35         return BAD_VALUE;
     36     }
     37 
     38     *transform = 0;
     39 
     40     camera_metadata_ro_entry_t entry = staticInfo.find(ANDROID_SENSOR_ORIENTATION);
     41     if (entry.count == 0) {
     42         ALOGE("%s: Can't find android.sensor.orientation in static metadata!", __FUNCTION__);
     43         return INVALID_OPERATION;
     44     }
     45 
     46     camera_metadata_ro_entry_t entryFacing = staticInfo.find(ANDROID_LENS_FACING);
     47     if (entry.count == 0) {
     48         ALOGE("%s: Can't find android.lens.facing in static metadata!", __FUNCTION__);
     49         return INVALID_OPERATION;
     50     }
     51 
     52     int32_t& flags = *transform;
     53 
     54     bool mirror = (entryFacing.data.u8[0] == ANDROID_LENS_FACING_FRONT);
     55     int orientation = entry.data.i32[0];
     56     if (!mirror) {
     57         switch (orientation) {
     58             case 0:
     59                 flags = 0;
     60                 break;
     61             case 90:
     62                 flags = NATIVE_WINDOW_TRANSFORM_ROT_90;
     63                 break;
     64             case 180:
     65                 flags = NATIVE_WINDOW_TRANSFORM_ROT_180;
     66                 break;
     67             case 270:
     68                 flags = NATIVE_WINDOW_TRANSFORM_ROT_270;
     69                 break;
     70             default:
     71                 ALOGE("%s: Invalid HAL android.sensor.orientation value: %d",
     72                       __FUNCTION__, orientation);
     73                 return INVALID_OPERATION;
     74         }
     75     } else {
     76         // Front camera needs to be horizontally flipped for mirror-like behavior.
     77         // Note: Flips are applied before rotates; using XOR here as some of these flags are
     78         // composed in terms of other flip/rotation flags, and are not bitwise-ORable.
     79         switch (orientation) {
     80             case 0:
     81                 flags = NATIVE_WINDOW_TRANSFORM_FLIP_H;
     82                 break;
     83             case 90:
     84                 flags = NATIVE_WINDOW_TRANSFORM_FLIP_H ^
     85                         NATIVE_WINDOW_TRANSFORM_ROT_270;
     86                 break;
     87             case 180:
     88                 flags = NATIVE_WINDOW_TRANSFORM_FLIP_H ^
     89                         NATIVE_WINDOW_TRANSFORM_ROT_180;
     90                 break;
     91             case 270:
     92                 flags = NATIVE_WINDOW_TRANSFORM_FLIP_H ^
     93                         NATIVE_WINDOW_TRANSFORM_ROT_90;
     94 
     95                 break;
     96             default:
     97                 ALOGE("%s: Invalid HAL android.sensor.orientation value: %d",
     98                       __FUNCTION__, orientation);
     99                 return INVALID_OPERATION;
    100         }
    101 
    102     }
    103 
    104     /**
    105      * This magic flag makes surfaceflinger un-rotate the buffers
    106      * to counter the extra global device UI rotation whenever the user
    107      * physically rotates the device.
    108      *
    109      * By doing this, the camera buffer always ends up aligned
    110      * with the physical camera for a "see through" effect.
    111      *
    112      * In essence, the buffer only gets rotated during preview use-cases.
    113      * The user is still responsible to re-create streams of the proper
    114      * aspect ratio, or the preview will end up looking non-uniformly
    115      * stretched.
    116      */
    117     flags |= NATIVE_WINDOW_TRANSFORM_INVERSE_DISPLAY;
    118 
    119     ALOGV("%s: final transform = 0x%x", __FUNCTION__, flags);
    120 
    121     return OK;
    122 }
    123 
    124 
    125 } /* namespace android */
    126