1 | /* Copyright 2019-2020 The Khronos Group Inc. |
2 | * SPDX-License-Identifier: Apache-2.0 |
3 | */ |
4 | |
5 | /** |
6 | * @file |
7 | * @~English |
8 | * @brief Helper functions for colourspaces. |
9 | */ |
10 | |
11 | #include <KHR/khr_df.h> |
12 | #include "dfd.h" |
13 | |
14 | typedef struct s_PrimaryMapping { |
15 | khr_df_primaries_e dfPrimaryEnum; |
16 | Primaries primaries; |
17 | } sPrimaryMapping; |
18 | |
19 | sPrimaryMapping primaryMap[] = { |
20 | { KHR_DF_PRIMARIES_BT709, { 0.640f,0.330f, 0.300f,0.600f, 0.150f,0.060f, 0.3127f,0.3290f}}, |
21 | { KHR_DF_PRIMARIES_BT601_EBU, { 0.640f,0.330f, 0.290f,0.600f, 0.150f,0.060f, 0.3127f,0.3290f}}, |
22 | { KHR_DF_PRIMARIES_BT601_SMPTE, { 0.630f,0.340f, 0.310f,0.595f, 0.155f,0.070f, 0.3127f,0.3290f}}, |
23 | { KHR_DF_PRIMARIES_BT2020, { 0.708f,0.292f, 0.170f,0.797f, 0.131f,0.046f, 0.3127f,0.3290f}}, |
24 | { KHR_DF_PRIMARIES_CIEXYZ, { 1.0f,0.0f, 0.0f,1.0f, 0.0f,0.0f, 0.0f,1.0f}}, |
25 | { KHR_DF_PRIMARIES_ACES, { 0.7347f,0.2653f, 0.0f,1.0f, 0.0001f,-0.077f, 0.32168f,0.33767f}}, |
26 | { KHR_DF_PRIMARIES_ACESCC, { 0.713f,0.293f, 0.165f,0.830f, 0.128f,0.044f, 0.32168f,0.33767f}}, |
27 | { KHR_DF_PRIMARIES_NTSC1953, { 0.67f,0.33f, 0.21f,0.71f, 0.14f,0.08f, 0.310f,0.316f}}, |
28 | { KHR_DF_PRIMARIES_PAL525, { 0.630f,0.340f, 0.310f,0.595f, 0.155f,0.070f, 0.3101f,0.3162f}}, |
29 | { KHR_DF_PRIMARIES_DISPLAYP3, { 0.6800f,0.3200f, 0.2650f,0.69f, 0.1500f,0.0600f, 0.3127f,0.3290f}}, |
30 | { KHR_DF_PRIMARIES_ADOBERGB, { 0.6400f,0.3300f, 0.2100f,0.71f, 0.1500f,0.0600f, 0.3127f,0.3290f}}}; |
31 | |
32 | /** |
33 | * @brief Map a set of primaries to a KDFS primaries enum. |
34 | * |
35 | * @param[in] p pointer to a Primaries struct filled in with the primary values. |
36 | * @param[in] latitude tolerance to use while matching. A suitable value might be 0.002 |
37 | * but it depends on the application. |
38 | */ |
39 | khr_df_primaries_e findMapping(Primaries *p, float latitude) { |
40 | unsigned int i; |
41 | for (i = 0; i < sizeof(primaryMap)/sizeof(sPrimaryMapping); ++i) { |
42 | if (primaryMap[i].primaries.Rx - p->Rx <= latitude && p->Rx - primaryMap[i].primaries.Rx <= latitude && |
43 | primaryMap[i].primaries.Gx - p->Gx <= latitude && p->Gx - primaryMap[i].primaries.Gx <= latitude && |
44 | primaryMap[i].primaries.Bx - p->Bx <= latitude && p->Bx - primaryMap[i].primaries.Bx <= latitude && |
45 | primaryMap[i].primaries.Wx - p->Wx <= latitude && p->Wx - primaryMap[i].primaries.Wx <= latitude) { |
46 | return primaryMap[i].dfPrimaryEnum; |
47 | } |
48 | } |
49 | /* No match */ |
50 | return KHR_DF_PRIMARIES_UNSPECIFIED; |
51 | } |
52 | |