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
28namespace android {
29
30status_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