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#ifndef ANDROID_CAMERA_CAMERA_FORMAT_CONVERTERS_H
18#define ANDROID_CAMERA_CAMERA_FORMAT_CONVERTERS_H
19
20/*
21 * Contains declaration of the API that allows converting frames from one
22 * pixel format to another.
23 *
24 * For the emulator, we really need to convert into two formats: YV12, which is
25 * used by the camera framework for video, and RGB32 for preview window.
26 */
27
28#include "camera-common.h"
29
30/* Checks if conversion between two pixel formats is available.
31 * Param:
32 *  from - Pixel format to convert from.
33 *  to - Pixel format to convert to.
34 * Return:
35 *  boolean: 1 if converter is available, or 0 if no conversion exists.
36 */
37extern int has_converter(uint32_t from, uint32_t to);
38
39/* Converts a frame into multiple framebuffers.
40 * When camera service replies to a framebuffer request from the client, it
41 * usualy sends two framebuffers in the reply: one for video, and another for
42 * preview window. Since these two framebuffers have different pixel formats
43 * (most of the time), we need to do two conversions for each frame received from
44 * the camera. This is the main intention behind this routine: to have a one call
45 * that produces as many conversions as needed.
46 * Param:
47 *  frame - Frame to convert.
48 *  pixel_format - Defines pixel format for the converting framebuffer.
49 *  framebuffer_size, width, height - Converting framebuffer byte size, width,
50 *      and height.
51 *  framebuffers - Array of framebuffers where to convert the frame. Size of this
52 *      array is defined by the 'fbs_num' parameter. Note that the caller must
53 *      make sure that buffers are large enough to contain entire frame captured
54 *      from the device.
55 *  fbs_num - Number of entries in the 'framebuffers' array.
56 *  r_scale, g_scale, b_scale - White balance scale.
57 *  exp_comp - Expsoure compensation.
58 * Return:
59 *  0 on success, or non-zero value on failure.
60*/
61extern int convert_frame(const void* frame,
62                         uint32_t pixel_format,
63                         size_t framebuffer_size,
64                         int width,
65                         int height,
66                         ClientFrameBuffer* framebuffers,
67                         int fbs_num,
68                         float r_scale,
69                         float g_scale,
70                         float b_scale,
71                         float exp_comp);
72
73#endif  /* ANDROID_CAMERA_CAMERA_FORMAT_CONVERTERS_H */
74