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 <android-base/properties.h>
24 #include <system/window.h>
25 #include <system/graphics.h>
26
27 #include <utils/Log.h>
28
29 namespace android {
30
31 const char *kCameraServiceDisabledProperty = "config.disable_cameraservice";
32
getRotationTransform(const CameraMetadata & staticInfo,int32_t * transform)33 status_t CameraUtils::getRotationTransform(const CameraMetadata& staticInfo,
34 /*out*/int32_t* transform) {
35 ALOGV("%s", __FUNCTION__);
36
37 if (transform == NULL) {
38 ALOGW("%s: null transform", __FUNCTION__);
39 return BAD_VALUE;
40 }
41
42 *transform = 0;
43
44 camera_metadata_ro_entry_t entry = staticInfo.find(ANDROID_SENSOR_ORIENTATION);
45 if (entry.count == 0) {
46 ALOGE("%s: Can't find android.sensor.orientation in static metadata!", __FUNCTION__);
47 return INVALID_OPERATION;
48 }
49
50 camera_metadata_ro_entry_t entryFacing = staticInfo.find(ANDROID_LENS_FACING);
51 if (entryFacing.count == 0) {
52 ALOGE("%s: Can't find android.lens.facing in static metadata!", __FUNCTION__);
53 return INVALID_OPERATION;
54 }
55
56 int32_t& flags = *transform;
57
58 bool mirror = (entryFacing.data.u8[0] == ANDROID_LENS_FACING_FRONT);
59 int orientation = entry.data.i32[0];
60 if (!mirror) {
61 switch (orientation) {
62 case 0:
63 flags = 0;
64 break;
65 case 90:
66 flags = NATIVE_WINDOW_TRANSFORM_ROT_90;
67 break;
68 case 180:
69 flags = NATIVE_WINDOW_TRANSFORM_ROT_180;
70 break;
71 case 270:
72 flags = NATIVE_WINDOW_TRANSFORM_ROT_270;
73 break;
74 default:
75 ALOGE("%s: Invalid HAL android.sensor.orientation value: %d",
76 __FUNCTION__, orientation);
77 return INVALID_OPERATION;
78 }
79 } else {
80 // Front camera needs to be horizontally flipped for mirror-like behavior.
81 // Note: Flips are applied before rotates; using XOR here as some of these flags are
82 // composed in terms of other flip/rotation flags, and are not bitwise-ORable.
83 switch (orientation) {
84 case 0:
85 flags = NATIVE_WINDOW_TRANSFORM_FLIP_H;
86 break;
87 case 90:
88 flags = NATIVE_WINDOW_TRANSFORM_FLIP_H ^
89 NATIVE_WINDOW_TRANSFORM_ROT_270;
90 break;
91 case 180:
92 flags = NATIVE_WINDOW_TRANSFORM_FLIP_H ^
93 NATIVE_WINDOW_TRANSFORM_ROT_180;
94 break;
95 case 270:
96 flags = NATIVE_WINDOW_TRANSFORM_FLIP_H ^
97 NATIVE_WINDOW_TRANSFORM_ROT_90;
98
99 break;
100 default:
101 ALOGE("%s: Invalid HAL android.sensor.orientation value: %d",
102 __FUNCTION__, orientation);
103 return INVALID_OPERATION;
104 }
105
106 }
107
108 /**
109 * This magic flag makes surfaceflinger un-rotate the buffers
110 * to counter the extra global device UI rotation whenever the user
111 * physically rotates the device.
112 *
113 * By doing this, the camera buffer always ends up aligned
114 * with the physical camera for a "see through" effect.
115 *
116 * In essence, the buffer only gets rotated during preview use-cases.
117 * The user is still responsible to re-create streams of the proper
118 * aspect ratio, or the preview will end up looking non-uniformly
119 * stretched.
120 */
121 flags |= NATIVE_WINDOW_TRANSFORM_INVERSE_DISPLAY;
122
123 ALOGV("%s: final transform = 0x%x", __FUNCTION__, flags);
124
125 return OK;
126 }
127
isCameraServiceDisabled()128 bool CameraUtils::isCameraServiceDisabled() {
129 return base::GetBoolProperty(kCameraServiceDisabledProperty, false);
130 }
131
132 } /* namespace android */
133