SurfaceTextureLayer.cpp revision b267579ba8dfe3f47d2a481c5a3c2254e3d565a1 
1/*
2 * Copyright (C) 2011 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#include <stdlib.h>
18#include <stdint.h>
19#include <sys/types.h>
20
21#include <utils/Errors.h>
22
23#include "Layer.h"
24#include "SurfaceTextureLayer.h"
25
26namespace android {
27// ---------------------------------------------------------------------------
28
29
30SurfaceTextureLayer::SurfaceTextureLayer()
31    : BufferQueue(true) {
32}
33
34SurfaceTextureLayer::~SurfaceTextureLayer() {
35}
36
37status_t SurfaceTextureLayer::connect(int api,
38        uint32_t* outWidth, uint32_t* outHeight, uint32_t* outTransform) {
39    status_t err = BufferQueue::connect(api,
40            outWidth, outHeight, outTransform);
41    if (err == NO_ERROR) {
42        switch(api) {
43            case NATIVE_WINDOW_API_CPU:
44                // SurfaceTextureClient supports only 2 buffers for CPU connections
45                this->setBufferCountServer(2);
46                break;
47            case NATIVE_WINDOW_API_MEDIA:
48            case NATIVE_WINDOW_API_CAMERA:
49                // Camera preview and videos are rate-limited on the producer
50                // side.  If enabled for this build, we use async mode to always
51                // show the most recent frame at the cost of requiring an
52                // additional buffer.
53#ifndef NEVER_DEFAULT_TO_ASYNC_MODE
54                err = setSynchronousMode(false);
55                break;
56#endif
57                // fall through to set synchronous mode when not defaulting to
58                // async mode.
59            default:
60                err = setSynchronousMode(true);
61                break;
62        }
63        if (err != NO_ERROR) {
64            disconnect(api);
65        }
66    }
67    return err;
68}
69
70// ---------------------------------------------------------------------------
71}; // namespace android
72