Blender  V3.3
BLI_math_color_test.cc
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1 /* SPDX-License-Identifier: Apache-2.0 */
2 
3 #include "testing/testing.h"
4 
5 #include "BLI_math.h"
6 
7 TEST(math_color, RGBToHSVRoundtrip)
8 {
9  float orig_rgb[3] = {0.1f, 0.2f, 0.3f};
10  float hsv[3], rgb[3];
11  rgb_to_hsv_v(orig_rgb, hsv);
12  hsv_to_rgb_v(hsv, rgb);
13  EXPECT_V3_NEAR(orig_rgb, rgb, 1e-5);
14 }
15 
16 TEST(math_color, RGBToHSLRoundtrip)
17 {
18  float orig_rgb[3] = {0.1f, 0.2f, 0.3f};
19  float hsl[3], rgb[3];
20  rgb_to_hsl_v(orig_rgb, hsl);
21  hsl_to_rgb_v(hsl, rgb);
22  EXPECT_V3_NEAR(orig_rgb, rgb, 1e-5);
23 }
24 
25 TEST(math_color, RGBToYUVRoundtrip)
26 {
27  float orig_rgb[3] = {0.1f, 0.2f, 0.3f};
28  float yuv[3], rgb[3];
29  rgb_to_yuv(orig_rgb[0], orig_rgb[1], orig_rgb[2], &yuv[0], &yuv[1], &yuv[2], BLI_YUV_ITU_BT709);
30  yuv_to_rgb(yuv[0], yuv[1], yuv[2], &rgb[0], &rgb[1], &rgb[2], BLI_YUV_ITU_BT709);
31  EXPECT_V3_NEAR(orig_rgb, rgb, 1e-4);
32 }
33 
34 TEST(math_color, RGBToYCCRoundtrip)
35 {
36  float orig_rgb[3] = {0.1f, 0.2f, 0.3f};
37  float ycc[3], rgb[3];
38 
39  rgb_to_ycc(orig_rgb[0], orig_rgb[1], orig_rgb[2], &ycc[0], &ycc[1], &ycc[2], BLI_YCC_ITU_BT601);
40  ycc_to_rgb(ycc[0], ycc[1], ycc[2], &rgb[0], &rgb[1], &rgb[2], BLI_YCC_ITU_BT601);
41  EXPECT_V3_NEAR(orig_rgb, rgb, 1e-3);
42 
43  rgb_to_ycc(orig_rgb[0], orig_rgb[1], orig_rgb[2], &ycc[0], &ycc[1], &ycc[2], BLI_YCC_ITU_BT709);
44  ycc_to_rgb(ycc[0], ycc[1], ycc[2], &rgb[0], &rgb[1], &rgb[2], BLI_YCC_ITU_BT709);
45  EXPECT_V3_NEAR(orig_rgb, rgb, 1e-3);
46 
47  rgb_to_ycc(orig_rgb[0], orig_rgb[1], orig_rgb[2], &ycc[0], &ycc[1], &ycc[2], BLI_YCC_JFIF_0_255);
48  ycc_to_rgb(ycc[0], ycc[1], ycc[2], &rgb[0], &rgb[1], &rgb[2], BLI_YCC_JFIF_0_255);
49  EXPECT_V3_NEAR(orig_rgb, rgb, 1e-3);
50 }
51 
52 TEST(math_color, LinearRGBTosRGBNearZero)
53 {
54  float linear_color = 0.002f;
55  float srgb_color = linearrgb_to_srgb(linear_color);
56  EXPECT_NEAR(0.02584f, srgb_color, 1e-5);
57 }
58 
59 TEST(math_color, LinearRGBTosRGB)
60 {
61  float linear_color = 0.75f;
62  float srgb_color = linearrgb_to_srgb(linear_color);
63  EXPECT_NEAR(0.880824f, srgb_color, 1e-5);
64 }
65 
66 TEST(math_color, LinearRGBTosRGBRoundtrip)
67 {
68  const int N = 50;
69  int i;
70  for (i = 0; i < N; ++i) {
71  float orig_linear_color = (float)i / N;
72  float srgb_color = linearrgb_to_srgb(orig_linear_color);
73  float linear_color = srgb_to_linearrgb(srgb_color);
74  EXPECT_NEAR(orig_linear_color, linear_color, 1e-5);
75  }
76 }
77 
79 {
80  float srgb_color[3];
81  {
82  const float kTolerance = 1.0e-8f;
83  const float linear_color[3] = {0.0023f, 0.0024f, 0.0025f};
84  linearrgb_to_srgb_v3_v3(srgb_color, linear_color);
85  EXPECT_NEAR(0.029716f, srgb_color[0], kTolerance);
86  EXPECT_NEAR(0.031008f, srgb_color[1], kTolerance);
87  EXPECT_NEAR(0.032300f, srgb_color[2], kTolerance);
88  }
89 
90  {
91  /* SIMD implementation of linear->srgb for larger inputs
92  * is less accurate; use larger tolerance. */
93  const float kTolerance = 3.6e-5f;
94  const float linear_color[3] = {0.71f, 0.75f, 0.78f};
95  linearrgb_to_srgb_v3_v3(srgb_color, linear_color);
96  EXPECT_NEAR(0.859696f, srgb_color[0], kTolerance);
97  EXPECT_NEAR(0.880825f, srgb_color[1], kTolerance);
98  EXPECT_NEAR(0.896244f, srgb_color[2], kTolerance);
99  }
100 
101  {
102  /* Not a common, but possible case: values beyond 1.0 range. */
103  const float kTolerance = 2.3e-4f;
104  const float linear_color[3] = {1.5f, 2.8f, 5.6f};
105  linearrgb_to_srgb_v3_v3(srgb_color, linear_color);
106  EXPECT_NEAR(1.19418f, srgb_color[0], kTolerance);
107  EXPECT_NEAR(1.56520f, srgb_color[1], kTolerance);
108  EXPECT_NEAR(2.10771f, srgb_color[2], kTolerance);
109  }
110 }
111 
113 {
114  float linear_color[3];
115  {
116  const float kTolerance = 1.0e-8f;
117  const float srgb_color[3] = {0.0023f, 0.0024f, 0.0025f};
118  srgb_to_linearrgb_v3_v3(linear_color, srgb_color);
119  EXPECT_NEAR(0.000178019f, linear_color[0], kTolerance);
120  EXPECT_NEAR(0.000185759f, linear_color[1], kTolerance);
121  EXPECT_NEAR(0.000193498f, linear_color[2], kTolerance);
122  }
123 
124  {
125  /* SIMD implementation of linear->srgb for larger inputs
126  * is less accurate; use larger tolerance. */
127  const float kTolerance = 1.5e-7f;
128  const float srgb_color[3] = {0.71f, 0.72f, 0.73f};
129  srgb_to_linearrgb_v3_v3(linear_color, srgb_color);
130  EXPECT_NEAR(0.4623615f, linear_color[0], kTolerance);
131  EXPECT_NEAR(0.4770000f, linear_color[1], kTolerance);
132  EXPECT_NEAR(0.4919052f, linear_color[2], kTolerance);
133  }
134 
135  {
136  /* Not a common, but possible case: values beyond 1.0 range. */
137  const float kTolerance = 7.7e-6f;
138  const float srgb_color[3] = {1.1f, 2.5f, 5.6f};
139  srgb_to_linearrgb_v3_v3(linear_color, srgb_color);
140  EXPECT_NEAR(1.24277f, linear_color[0], kTolerance);
141  EXPECT_NEAR(8.35473f, linear_color[1], kTolerance);
142  EXPECT_NEAR(56.23833f, linear_color[2], kTolerance);
143  }
144 }
typedef float(TangentPoint)[2]
void hsv_to_rgb_v(const float hsv[3], float r_rgb[3])
Definition: math_color.c:49
void rgb_to_hsv_v(const float rgb[3], float r_hsv[3])
Definition: math_color.c:232
MINLINE void srgb_to_linearrgb_v3_v3(float linear[3], const float srgb[3])
#define BLI_YUV_ITU_BT709
#define BLI_YCC_JFIF_0_255
void hsl_to_rgb_v(const float hsl[3], float r_rgb[3])
Definition: math_color.c:54
void ycc_to_rgb(float y, float cb, float cr, float *r_r, float *r_g, float *r_b, int colorspace)
Definition: math_color.c:142
#define BLI_YCC_ITU_BT601
void rgb_to_ycc(float r, float g, float b, float *r_y, float *r_cb, float *r_cr, int colorspace)
Definition: math_color.c:107
void rgb_to_yuv(float r, float g, float b, float *r_y, float *r_u, float *r_v, int colorspace)
Definition: math_color.c:59
float srgb_to_linearrgb(float c)
Definition: math_color.c:403
MINLINE void linearrgb_to_srgb_v3_v3(float srgb[3], const float linear[3])
float linearrgb_to_srgb(float c)
Definition: math_color.c:412
void yuv_to_rgb(float y, float u, float v, float *r_r, float *r_g, float *r_b, int colorspace)
Definition: math_color.c:83
void rgb_to_hsl_v(const float rgb[3], float r_hsl[3])
Definition: math_color.c:292
#define BLI_YCC_ITU_BT709
TEST(math_color, RGBToHSVRoundtrip)
ATTR_WARN_UNUSED_RESULT const BMVert const BMEdge * e
#define N
static const pxr::TfToken rgb("rgb", pxr::TfToken::Immortal)