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