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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "CameraUtils"
//#define LOG_NDEBUG 0
#include <camera/CameraUtils.h>
#include <system/window.h>
#include <system/graphics.h>
#include <utils/Log.h>
namespace android {
status_t CameraUtils::getRotationTransform(const CameraMetadata& staticInfo,
/*out*/int32_t* transform) {
ALOGV("%s", __FUNCTION__);
if (transform == NULL) {
ALOGW("%s: null transform", __FUNCTION__);
return BAD_VALUE;
}
*transform = 0;
camera_metadata_ro_entry_t entry = staticInfo.find(ANDROID_SENSOR_ORIENTATION);
if (entry.count == 0) {
ALOGE("%s: Can't find android.sensor.orientation in static metadata!", __FUNCTION__);
return INVALID_OPERATION;
}
camera_metadata_ro_entry_t entryFacing = staticInfo.find(ANDROID_LENS_FACING);
if (entry.count == 0) {
ALOGE("%s: Can't find android.lens.facing in static metadata!", __FUNCTION__);
return INVALID_OPERATION;
}
int32_t& flags = *transform;
bool mirror = (entryFacing.data.u8[0] == ANDROID_LENS_FACING_FRONT);
int orientation = entry.data.i32[0];
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 {
// Front camera needs to be horizontally flipped for mirror-like behavior.
// Note: Flips are applied before rotates; using XOR here as some of these flags are
// composed in terms of other flip/rotation flags, and are not bitwise-ORable.
switch (orientation) {
case 0:
flags = NATIVE_WINDOW_TRANSFORM_FLIP_H;
break;
case 90:
flags = NATIVE_WINDOW_TRANSFORM_FLIP_H ^
NATIVE_WINDOW_TRANSFORM_ROT_270;
break;
case 180:
flags = NATIVE_WINDOW_TRANSFORM_FLIP_H ^
NATIVE_WINDOW_TRANSFORM_ROT_180;
break;
case 270:
flags = NATIVE_WINDOW_TRANSFORM_FLIP_H ^
NATIVE_WINDOW_TRANSFORM_ROT_90;
break;
default:
ALOGE("%s: Invalid HAL android.sensor.orientation value: %d",
__FUNCTION__, orientation);
return INVALID_OPERATION;
}
}
/**
* This magic flag makes surfaceflinger un-rotate the buffers
* to counter the extra global device UI rotation whenever the user
* physically rotates the device.
*
* By doing this, the camera buffer always ends up aligned
* with the physical camera for a "see through" effect.
*
* In essence, the buffer only gets rotated during preview use-cases.
* The user is still responsible to re-create streams of the proper
* aspect ratio, or the preview will end up looking non-uniformly
* stretched.
*/
flags |= NATIVE_WINDOW_TRANSFORM_INVERSE_DISPLAY;
ALOGV("%s: final transform = 0x%x", __FUNCTION__, flags);
return OK;
}
} /* namespace android */
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