зеркало из https://github.com/mozilla/gecko-dev.git
133 строки
3.8 KiB
C++
133 строки
3.8 KiB
C++
/*
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* Copyright (C) 2012 Mozilla Foundation
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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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#include <camera/Camera.h>
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#include "jsapi.h"
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#include "GonkCameraControl.h"
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#include "DOMCameraManager.h"
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#include "CameraCommon.h"
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// From nsDOMCameraManager, but gonk-specific!
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nsresult
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nsDOMCameraManager::GetNumberOfCameras(int32_t& aDeviceCount)
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{
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aDeviceCount = android::Camera::getNumberOfCameras();
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return NS_OK;
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}
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nsresult
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nsDOMCameraManager::GetCameraName(uint32_t aDeviceNum, nsCString& aDeviceName)
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{
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int32_t count = android::Camera::getNumberOfCameras();
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DOM_CAMERA_LOGI("GetCameraName : getNumberOfCameras() returned %d\n", count);
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if (aDeviceNum > count) {
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DOM_CAMERA_LOGE("GetCameraName : invalid device number");
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return NS_ERROR_NOT_AVAILABLE;
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}
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android::CameraInfo info;
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int rv = android::Camera::getCameraInfo(aDeviceNum, &info);
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if (rv != 0) {
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DOM_CAMERA_LOGE("GetCameraName : get_camera_info(%d) failed: %d\n", aDeviceNum, rv);
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return NS_ERROR_NOT_AVAILABLE;
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}
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switch (info.facing) {
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case CAMERA_FACING_BACK:
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aDeviceName.Assign("back");
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break;
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case CAMERA_FACING_FRONT:
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aDeviceName.Assign("front");
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break;
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default:
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aDeviceName.Assign("extra-camera-");
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aDeviceName.AppendInt(aDeviceNum);
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break;
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}
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return NS_OK;
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}
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/* void getListOfCameras ([optional] out unsigned long aCount, [array, size_is (aCount), retval] out string aCameras); */
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NS_IMETHODIMP
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nsDOMCameraManager::GetListOfCameras(uint32_t *aCount, char * **aCameras)
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{
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int32_t count = android::Camera::getNumberOfCameras();
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DOM_CAMERA_LOGI("GetListOfCameras : getNumberOfCameras() returned %d\n", count);
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if (count < 1) {
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*aCameras = nullptr;
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*aCount = 0;
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return NS_OK;
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}
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// Allocate 2 extra slots to reserve space for 'front' and 'back' cameras
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// at the front of the array--we will collapse any empty slots below.
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int32_t arraySize = count + 2;
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char** cameras = static_cast<char**>(NS_Alloc(arraySize * sizeof(char*)));
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for (int32_t i = 0; i < arraySize; ++i) {
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cameras[i] = nullptr;
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}
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uint32_t extraIndex = 2;
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bool gotFront = false;
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bool gotBack = false;
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for (int32_t i = 0; i < count; ++i) {
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nsCString cameraName;
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nsresult result = GetCameraName(i, cameraName);
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if (result != NS_OK) {
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continue;
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}
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// The first camera we find named 'back' gets slot 0; and the first
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// we find named 'front' gets slot 1. All others appear after these.
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uint32_t index;
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if (!gotBack && !cameraName.Compare("back")) {
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index = 0;
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gotBack = true;
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} else if (!gotFront && !cameraName.Compare("front")) {
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index = 1;
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gotFront = true;
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} else {
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index = extraIndex++;
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}
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MOZ_ASSERT(index < arraySize);
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cameras[index] = ToNewCString(cameraName);
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}
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// Make a forward pass over the array to compact it; after this loop,
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// 'offset' will contain the number of nullptrs in the array, which
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// we use to adjust the value returned in 'aCount'.
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int32_t offset = 0;
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for (int32_t i = 0; i < arraySize; ++i) {
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if (cameras[i] == nullptr) {
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offset++;
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} else if (offset != 0) {
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cameras[i - offset] = cameras[i];
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cameras[i] = nullptr;
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}
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}
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MOZ_ASSERT(offset >= 2);
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*aCameras = cameras;
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*aCount = arraySize - offset;
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return NS_OK;
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}
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