1/*
2 * Copyright 2018 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/**
18 * @file data_space.h
19 */
20
21#ifndef ANDROID_DATA_SPACE_H
22#define ANDROID_DATA_SPACE_H
23
24#include <inttypes.h>
25
26#include <sys/cdefs.h>
27
28__BEGIN_DECLS
29
30/**
31 * ADataSpace.
32 */
33enum ADataSpace {
34    /**
35     * Default-assumption data space, when not explicitly specified.
36     *
37     * It is safest to assume the buffer is an image with sRGB primaries and
38     * encoding ranges, but the consumer and/or the producer of the data may
39     * simply be using defaults. No automatic gamma transform should be
40     * expected, except for a possible display gamma transform when drawn to a
41     * screen.
42     */
43    ADATASPACE_UNKNOWN = 0,
44
45    /**
46     * scRGB linear encoding:
47     *
48     * The red, green, and blue components are stored in extended sRGB space,
49     * but are linear, not gamma-encoded.
50     * The RGB primaries and the white point are the same as BT.709.
51     *
52     * The values are floating point.
53     * A pixel value of 1.0, 1.0, 1.0 corresponds to sRGB white (D65) at 80 nits.
54     * Values beyond the range [0.0 - 1.0] would correspond to other colors
55     * spaces and/or HDR content.
56     */
57    ADATASPACE_SCRGB_LINEAR = 406913024, // STANDARD_BT709 | TRANSFER_LINEAR | RANGE_EXTENDED
58
59    /**
60     * sRGB gamma encoding:
61     *
62     * The red, green and blue components are stored in sRGB space, and
63     * converted to linear space when read, using the SRGB transfer function
64     * for each of the R, G and B components. When written, the inverse
65     * transformation is performed.
66     *
67     * The alpha component, if present, is always stored in linear space and
68     * is left unmodified when read or written.
69     *
70     * Use full range and BT.709 standard.
71     */
72    ADATASPACE_SRGB = 142671872, // STANDARD_BT709 | TRANSFER_SRGB | RANGE_FULL
73
74    /**
75     * scRGB:
76     *
77     * The red, green, and blue components are stored in extended sRGB space,
78     * but are linear, not gamma-encoded.
79     * The RGB primaries and the white point are the same as BT.709.
80     *
81     * The values are floating point.
82     * A pixel value of 1.0, 1.0, 1.0 corresponds to sRGB white (D65) at 80 nits.
83     * Values beyond the range [0.0 - 1.0] would correspond to other colors
84     * spaces and/or HDR content.
85     */
86    ADATASPACE_SCRGB = 411107328, // STANDARD_BT709 | TRANSFER_SRGB | RANGE_EXTENDED
87
88    /**
89     * Display P3
90     *
91     * Use same primaries and white-point as DCI-P3
92     * but sRGB transfer function.
93     */
94    ADATASPACE_DISPLAY_P3 = 143261696, // STANDARD_DCI_P3 | TRANSFER_SRGB | RANGE_FULL
95
96    /**
97     * ITU-R Recommendation 2020 (BT.2020)
98     *
99     * Ultra High-definition television
100     *
101     * Use full range, SMPTE 2084 (PQ) transfer and BT2020 standard
102     */
103    ADATASPACE_BT2020_PQ = 163971072, // STANDARD_BT2020 | TRANSFER_ST2084 | RANGE_FULL
104};
105
106__END_DECLS
107
108#endif // ANDROID_DATA_SPACE_H
109