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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 #include <media/hardware/HardwareAPI.h>
     22 
     23 #include <system/window.h>
     24 #include <system/graphics.h>
     25 
     26 #include <utils/Log.h>
     27 
     28 namespace android {
     29 
     30 status_t CameraUtils::getRotationTransform(const CameraMetadata& staticInfo,
     31                 /*out*/int32_t* transform) {
     32     ALOGV("%s", __FUNCTION__);
     33 
     34     if (transform == NULL) {
     35         ALOGW("%s: null transform", __FUNCTION__);
     36         return BAD_VALUE;
     37     }
     38 
     39     *transform = 0;
     40 
     41     camera_metadata_ro_entry_t entry = staticInfo.find(ANDROID_SENSOR_ORIENTATION);
     42     if (entry.count == 0) {
     43         ALOGE("%s: Can't find android.sensor.orientation in static metadata!", __FUNCTION__);
     44         return INVALID_OPERATION;
     45     }
     46 
     47     camera_metadata_ro_entry_t entryFacing = staticInfo.find(ANDROID_LENS_FACING);
     48     if (entryFacing.count == 0) {
     49         ALOGE("%s: Can't find android.lens.facing in static metadata!", __FUNCTION__);
     50         return INVALID_OPERATION;
     51     }
     52 
     53     int32_t& flags = *transform;
     54 
     55     bool mirror = (entryFacing.data.u8[0] == ANDROID_LENS_FACING_FRONT);
     56     int orientation = entry.data.i32[0];
     57     if (!mirror) {
     58         switch (orientation) {
     59             case 0:
     60                 flags = 0;
     61                 break;
     62             case 90:
     63                 flags = NATIVE_WINDOW_TRANSFORM_ROT_90;
     64                 break;
     65             case 180:
     66                 flags = NATIVE_WINDOW_TRANSFORM_ROT_180;
     67                 break;
     68             case 270:
     69                 flags = NATIVE_WINDOW_TRANSFORM_ROT_270;
     70                 break;
     71             default:
     72                 ALOGE("%s: Invalid HAL android.sensor.orientation value: %d",
     73                       __FUNCTION__, orientation);
     74                 return INVALID_OPERATION;
     75         }
     76     } else {
     77         // Front camera needs to be horizontally flipped for mirror-like behavior.
     78         // Note: Flips are applied before rotates; using XOR here as some of these flags are
     79         // composed in terms of other flip/rotation flags, and are not bitwise-ORable.
     80         switch (orientation) {
     81             case 0:
     82                 flags = NATIVE_WINDOW_TRANSFORM_FLIP_H;
     83                 break;
     84             case 90:
     85                 flags = NATIVE_WINDOW_TRANSFORM_FLIP_H ^
     86                         NATIVE_WINDOW_TRANSFORM_ROT_270;
     87                 break;
     88             case 180:
     89                 flags = NATIVE_WINDOW_TRANSFORM_FLIP_H ^
     90                         NATIVE_WINDOW_TRANSFORM_ROT_180;
     91                 break;
     92             case 270:
     93                 flags = NATIVE_WINDOW_TRANSFORM_FLIP_H ^
     94                         NATIVE_WINDOW_TRANSFORM_ROT_90;
     95 
     96                 break;
     97             default:
     98                 ALOGE("%s: Invalid HAL android.sensor.orientation value: %d",
     99                       __FUNCTION__, orientation);
    100                 return INVALID_OPERATION;
    101         }
    102 
    103     }
    104 
    105     /**
    106      * This magic flag makes surfaceflinger un-rotate the buffers
    107      * to counter the extra global device UI rotation whenever the user
    108      * physically rotates the device.
    109      *
    110      * By doing this, the camera buffer always ends up aligned
    111      * with the physical camera for a "see through" effect.
    112      *
    113      * In essence, the buffer only gets rotated during preview use-cases.
    114      * The user is still responsible to re-create streams of the proper
    115      * aspect ratio, or the preview will end up looking non-uniformly
    116      * stretched.
    117      */
    118     flags |= NATIVE_WINDOW_TRANSFORM_INVERSE_DISPLAY;
    119 
    120     ALOGV("%s: final transform = 0x%x", __FUNCTION__, flags);
    121 
    122     return OK;
    123 }
    124 
    125 } /* namespace android */
    126