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colorspace.c
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colorspace.c
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#include "tests.h"
int main()
{
for (enum pl_color_system sys = 0; sys < PL_COLOR_SYSTEM_COUNT; sys++) {
bool ycbcr = sys >= PL_COLOR_SYSTEM_BT_601 && sys <= PL_COLOR_SYSTEM_YCGCO;
REQUIRE(ycbcr == pl_color_system_is_ycbcr_like(sys));
}
for (enum pl_color_transfer trc = 0; trc < PL_COLOR_TRC_COUNT; trc++) {
bool hdr = trc >= PL_COLOR_TRC_PQ && trc <= PL_COLOR_TRC_S_LOG2;
REQUIRE(hdr == pl_color_transfer_is_hdr(trc));
REQUIRE(pl_color_transfer_nominal_peak(trc) >= 1.0);
}
float pq_peak = pl_color_transfer_nominal_peak(PL_COLOR_TRC_PQ);
REQUIRE(feq(PL_COLOR_SDR_WHITE * pq_peak, 10000, 1e-7));
struct pl_color_repr tv_repr = {
.sys = PL_COLOR_SYSTEM_BT_709,
.levels = PL_COLOR_LEVELS_LIMITED,
};
struct pl_color_repr pc_repr = {
.sys = PL_COLOR_SYSTEM_RGB,
.levels = PL_COLOR_LEVELS_FULL,
};
// Ensure this is a no-op for bits == bits
for (int bits = 1; bits <= 16; bits++) {
tv_repr.bits.color_depth = tv_repr.bits.sample_depth = bits;
pc_repr.bits.color_depth = pc_repr.bits.sample_depth = bits;
REQUIRE(feq(pl_color_repr_normalize(&tv_repr), 1.0, 1e-7));
REQUIRE(feq(pl_color_repr_normalize(&pc_repr), 1.0, 1e-7));
}
tv_repr.bits.color_depth = 8;
tv_repr.bits.sample_depth = 10;
float tv8to10 = pl_color_repr_normalize(&tv_repr);
tv_repr.bits.color_depth = 8;
tv_repr.bits.sample_depth = 12;
float tv8to12 = pl_color_repr_normalize(&tv_repr);
// Simulate the effect of GPU texture sampling on UNORM texture
REQUIRE(feq(tv8to10 * 16 /1023., 64/1023., 1e-7)); // black
REQUIRE(feq(tv8to10 * 235/1023., 940/1023., 1e-7)); // nominal white
REQUIRE(feq(tv8to10 * 128/1023., 512/1023., 1e-7)); // achromatic
REQUIRE(feq(tv8to10 * 240/1023., 960/1023., 1e-7)); // nominal chroma peak
REQUIRE(feq(tv8to12 * 16 /4095., 256 /4095., 1e-7)); // black
REQUIRE(feq(tv8to12 * 235/4095., 3760/4095., 1e-7)); // nominal white
REQUIRE(feq(tv8to12 * 128/4095., 2048/4095., 1e-7)); // achromatic
REQUIRE(feq(tv8to12 * 240/4095., 3840/4095., 1e-7)); // nominal chroma peak
// Ensure lavc's xyz12 is handled correctly
struct pl_color_repr xyz12 = {
.sys = PL_COLOR_SYSTEM_XYZ,
.levels = PL_COLOR_LEVELS_UNKNOWN,
.bits = {
.sample_depth = 16,
.color_depth = 12,
.bit_shift = 4,
},
};
float xyz = pl_color_repr_normalize(&xyz12);
REQUIRE(feq(xyz * (4095 << 4), 65535, 1e-7));
// Assume we uploaded a 10-bit source directly (unshifted) as a 16-bit
// texture. This texture multiplication factor should make it behave as if
// it was uploaded as a 10-bit texture instead.
pc_repr.bits.color_depth = 10;
pc_repr.bits.sample_depth = 16;
float pc10to16 = pl_color_repr_normalize(&pc_repr);
REQUIRE(feq(pc10to16 * 1000/65535., 1000/1023., 1e-7));
const struct pl_raw_primaries *bt709, *bt2020;
bt709 = pl_raw_primaries_get(PL_COLOR_PRIM_BT_709);
bt2020 = pl_raw_primaries_get(PL_COLOR_PRIM_BT_2020);
struct pl_matrix3x3 rgb2xyz, rgb2xyz_;
rgb2xyz = rgb2xyz_ = pl_get_rgb2xyz_matrix(bt709);
pl_matrix3x3_invert(&rgb2xyz_);
pl_matrix3x3_invert(&rgb2xyz_);
// Make sure the double-inversion round trips
for (int y = 0; y < 3; y++) {
for (int x = 0; x < 3; x++)
REQUIRE(feq(rgb2xyz.m[y][x], rgb2xyz_.m[y][x], 1e-6));
}
// Make sure mapping the spectral RGB colors (i.e. the matrix rows) matches
// our original primaries
float Y = rgb2xyz.m[1][0];
REQUIRE(feq(rgb2xyz.m[0][0], pl_cie_X(bt709->red) * Y, 1e-7));
REQUIRE(feq(rgb2xyz.m[2][0], pl_cie_Z(bt709->red) * Y, 1e-7));
Y = rgb2xyz.m[1][1];
REQUIRE(feq(rgb2xyz.m[0][1], pl_cie_X(bt709->green) * Y, 1e-7));
REQUIRE(feq(rgb2xyz.m[2][1], pl_cie_Z(bt709->green) * Y, 1e-7));
Y = rgb2xyz.m[1][2];
REQUIRE(feq(rgb2xyz.m[0][2], pl_cie_X(bt709->blue) * Y, 1e-7));
REQUIRE(feq(rgb2xyz.m[2][2], pl_cie_Z(bt709->blue) * Y, 1e-7));
// Make sure the gamut mapping round-trips
struct pl_matrix3x3 bt709_bt2020, bt2020_bt709;
bt709_bt2020 = pl_get_color_mapping_matrix(bt709, bt2020, PL_INTENT_RELATIVE_COLORIMETRIC);
bt2020_bt709 = pl_get_color_mapping_matrix(bt2020, bt709, PL_INTENT_RELATIVE_COLORIMETRIC);
for (int n = 0; n < 10; n++) {
float vec[3] = { RANDOM, RANDOM, RANDOM };
float dst[3] = { vec[0], vec[1], vec[2] };
pl_matrix3x3_apply(&bt709_bt2020, dst);
pl_matrix3x3_apply(&bt2020_bt709, dst);
for (int i = 0; i < 3; i++)
REQUIRE(feq(dst[i], vec[i], 1e-6));
}
// Ensure the decoding matrix round-trips to white/black
for (enum pl_color_system sys = 0; sys < PL_COLOR_SYSTEM_COUNT; sys++) {
if (!pl_color_system_is_linear(sys))
continue;
printf("testing color system %u\n", (unsigned) sys);
struct pl_color_repr repr = {
.levels = PL_COLOR_LEVELS_LIMITED,
.sys = sys,
};
struct pl_transform3x3 yuv2rgb = pl_color_repr_decode(&repr, NULL);
static const float white_ycbcr[3] = { 235/255., 128/255., 128/255. };
static const float black_ycbcr[3] = { 16/255., 128/255., 128/255. };
static const float white_other[3] = { 235/255., 235/255., 235/255. };
static const float black_other[3] = { 16/255., 16/255., 16/255. };
float white[3], black[3];
for (int i = 0; i < 3; i++) {
if (pl_color_system_is_ycbcr_like(sys)) {
white[i] = white_ycbcr[i];
black[i] = black_ycbcr[i];
} else {
white[i] = white_other[i];
black[i] = black_other[i];
}
}
pl_transform3x3_apply(&yuv2rgb, white);
REQUIRE(feq(white[0], 1.0, 1e-6));
REQUIRE(feq(white[1], 1.0, 1e-6));
REQUIRE(feq(white[2], 1.0, 1e-6));
pl_transform3x3_apply(&yuv2rgb, black);
REQUIRE(feq(black[0], 0.0, 1e-6));
REQUIRE(feq(black[1], 0.0, 1e-6));
REQUIRE(feq(black[2], 0.0, 1e-6));
}
// Make sure chromatic adaptation works
struct pl_raw_primaries bt709_d50;
bt709_d50 = *pl_raw_primaries_get(PL_COLOR_PRIM_BT_709);
bt709_d50.white = (struct pl_cie_xy) { 0.34567, 0.35850 };
struct pl_matrix3x3 d50_d65;
d50_d65 = pl_get_color_mapping_matrix(&bt709_d50, bt709, PL_INTENT_RELATIVE_COLORIMETRIC);
float white[3] = { 1.0, 1.0, 1.0 };
pl_matrix3x3_apply(&d50_d65, white);
REQUIRE(feq(white[0], 1.0, 1e-6) && feq(white[1], 1.0, 1e-6) && feq(white[2], 1.0, 1e-6));
// Simulate a typical 10-bit YCbCr -> 16 bit texture conversion
tv_repr.bits.color_depth = 10;
tv_repr.bits.sample_depth = 16;
struct pl_transform3x3 yuv2rgb;
yuv2rgb = pl_color_repr_decode(&tv_repr, NULL);
float test[3] = { 575/65535., 336/65535., 640/65535. };
pl_transform3x3_apply(&yuv2rgb, test);
REQUIRE(feq(test[0], 0.808305, 1e-6));
REQUIRE(feq(test[1], 0.553254, 1e-6));
REQUIRE(feq(test[2], 0.218841, 1e-6));
// DVD
REQUIRE(pl_color_system_guess_ycbcr(720, 480) == PL_COLOR_SYSTEM_BT_601);
REQUIRE(pl_color_system_guess_ycbcr(720, 576) == PL_COLOR_SYSTEM_BT_601);
REQUIRE(pl_color_primaries_guess(720, 576) == PL_COLOR_PRIM_BT_601_625);
REQUIRE(pl_color_primaries_guess(720, 480) == PL_COLOR_PRIM_BT_601_525);
// PAL 16:9
REQUIRE(pl_color_system_guess_ycbcr(1024, 576) == PL_COLOR_SYSTEM_BT_601);
REQUIRE(pl_color_primaries_guess(1024, 576) == PL_COLOR_PRIM_BT_601_625);
// HD
REQUIRE(pl_color_system_guess_ycbcr(1280, 720) == PL_COLOR_SYSTEM_BT_709);
REQUIRE(pl_color_system_guess_ycbcr(1920, 1080) == PL_COLOR_SYSTEM_BT_709);
REQUIRE(pl_color_primaries_guess(1280, 720) == PL_COLOR_PRIM_BT_709);
REQUIRE(pl_color_primaries_guess(1920, 1080) == PL_COLOR_PRIM_BT_709);
// Odd/weird videos
REQUIRE(pl_color_primaries_guess(2000, 576) == PL_COLOR_PRIM_BT_709);
REQUIRE(pl_color_primaries_guess(200, 200) == PL_COLOR_PRIM_BT_709);
REQUIRE(pl_color_repr_equal(&pl_color_repr_sdtv, &pl_color_repr_sdtv));
REQUIRE(!pl_color_repr_equal(&pl_color_repr_sdtv, &pl_color_repr_hdtv));
struct pl_color_repr repr = pl_color_repr_unknown;
pl_color_repr_merge(&repr, &pl_color_repr_uhdtv);
REQUIRE(pl_color_repr_equal(&repr, &pl_color_repr_uhdtv));
REQUIRE(!pl_color_primaries_is_wide_gamut(PL_COLOR_PRIM_UNKNOWN));
REQUIRE(!pl_color_primaries_is_wide_gamut(PL_COLOR_PRIM_BT_601_525));
REQUIRE(!pl_color_primaries_is_wide_gamut(PL_COLOR_PRIM_BT_601_625));
REQUIRE(!pl_color_primaries_is_wide_gamut(PL_COLOR_PRIM_BT_709));
REQUIRE(!pl_color_primaries_is_wide_gamut(PL_COLOR_PRIM_BT_470M));
REQUIRE(pl_color_primaries_is_wide_gamut(PL_COLOR_PRIM_BT_2020));
REQUIRE(pl_color_primaries_is_wide_gamut(PL_COLOR_PRIM_APPLE));
REQUIRE(pl_color_primaries_is_wide_gamut(PL_COLOR_PRIM_ADOBE));
REQUIRE(pl_color_primaries_is_wide_gamut(PL_COLOR_PRIM_PRO_PHOTO));
REQUIRE(pl_color_primaries_is_wide_gamut(PL_COLOR_PRIM_CIE_1931));
REQUIRE(pl_color_primaries_is_wide_gamut(PL_COLOR_PRIM_DCI_P3));
REQUIRE(pl_color_primaries_is_wide_gamut(PL_COLOR_PRIM_DISPLAY_P3));
REQUIRE(pl_color_primaries_is_wide_gamut(PL_COLOR_PRIM_V_GAMUT));
REQUIRE(pl_color_primaries_is_wide_gamut(PL_COLOR_PRIM_S_GAMUT));
REQUIRE(!pl_color_light_is_scene_referred(PL_COLOR_LIGHT_UNKNOWN));
REQUIRE(!pl_color_light_is_scene_referred(PL_COLOR_LIGHT_DISPLAY));
REQUIRE(pl_color_light_is_scene_referred(PL_COLOR_LIGHT_SCENE_HLG));
REQUIRE(pl_color_light_is_scene_referred(PL_COLOR_LIGHT_SCENE_709_1886));
REQUIRE(pl_color_light_is_scene_referred(PL_COLOR_LIGHT_SCENE_1_2));
struct pl_color_space space = pl_color_space_unknown;
pl_color_space_merge(&space, &pl_color_space_bt709);
REQUIRE(pl_color_space_equal(&space, &pl_color_space_bt709));
// Infer some color spaces
struct pl_color_space hlg = {
.primaries = PL_COLOR_PRIM_BT_2020,
.transfer = PL_COLOR_TRC_HLG,
};
pl_color_space_infer(&hlg);
REQUIRE(hlg.light == PL_COLOR_LIGHT_SCENE_HLG);
struct pl_color_space unknown = {0};
struct pl_color_space display = {
.primaries = PL_COLOR_PRIM_BT_709,
.transfer = PL_COLOR_TRC_BT_1886,
.light = PL_COLOR_LIGHT_DISPLAY,
.sig_peak = 1.0,
.sig_avg = 0.25,
.sig_scale = 1.0,
};
pl_color_space_infer(&unknown);
REQUIRE(pl_color_space_equal(&unknown, &display));
float x, y;
pl_chroma_location_offset(PL_CHROMA_LEFT, &x, &y);
REQUIRE(x == -0.5 && y == 0.0);
pl_chroma_location_offset(PL_CHROMA_TOP_LEFT, &x, &y);
REQUIRE(x == -0.5 && y == -0.5);
pl_chroma_location_offset(PL_CHROMA_CENTER, &x, &y);
REQUIRE(x == 0.0 && y == 0.0);
pl_chroma_location_offset(PL_CHROMA_BOTTOM_CENTER, &x, &y);
REQUIRE(x == 0.0 && y == 0.5);
REQUIRE(pl_raw_primaries_get(PL_COLOR_PRIM_UNKNOWN) ==
pl_raw_primaries_get(PL_COLOR_PRIM_BT_709));
// Color blindness tests
float red[3] = { 1.0, 0.0, 0.0 };
float green[3] = { 0.0, 1.0, 0.0 };
float blue[3] = { 0.0, 0.0, 1.0 };
#define TEST_CONE(model, color) \
do { \
float tmp[3] = { (color)[0], (color)[1], (color)[2] }; \
struct pl_matrix3x3 mat = pl_get_cone_matrix(&(model), bt709); \
pl_matrix3x3_apply(&mat, tmp); \
printf("%s + %s = %f %f %f\n", #model, #color, tmp[0], tmp[1], tmp[2]); \
for (int i = 0; i < 3; i++) \
REQUIRE(fabs((color)[i] - tmp[i]) < 1e-6); \
} while(0)
struct pl_cone_params red_only = { .cones = PL_CONE_MS };
struct pl_cone_params green_only = { .cones = PL_CONE_LS };
struct pl_cone_params blue_only = pl_vision_monochromacy;
// These models should all round-trip white
TEST_CONE(pl_vision_normal, white);
TEST_CONE(pl_vision_protanopia, white);
TEST_CONE(pl_vision_protanomaly, white);
TEST_CONE(pl_vision_deuteranomaly, white);
TEST_CONE(pl_vision_tritanomaly, white);
TEST_CONE(pl_vision_achromatopsia, white);
TEST_CONE(red_only, white);
TEST_CONE(green_only, white);
TEST_CONE(blue_only, white);
// These models should round-trip blue
TEST_CONE(pl_vision_normal, blue);
TEST_CONE(pl_vision_protanomaly, blue);
TEST_CONE(pl_vision_deuteranomaly, blue);
// These models should round-trip red
TEST_CONE(pl_vision_normal, red);
TEST_CONE(pl_vision_tritanomaly, red);
TEST_CONE(pl_vision_tritanopia, red);
// These models should round-trip green
TEST_CONE(pl_vision_normal, green);
// Color adaptation tests
struct pl_cie_xy d65 = pl_white_from_temp(6504);
struct pl_cie_xy d55 = pl_white_from_temp(5503);
REQUIRE(feq(d65.x, 0.31271, 1e-3) && feq(d65.y, 0.32902, 1e-3));
REQUIRE(feq(d55.x, 0.33242, 1e-3) && feq(d55.y, 0.34743, 1e-3));
}