diff options
Diffstat (limited to 'src/libclut.h')
| -rw-r--r-- | src/libclut.h | 521 |
1 files changed, 494 insertions, 27 deletions
diff --git a/src/libclut.h b/src/libclut.h index 9f3326b..c687afa 100644 --- a/src/libclut.h +++ b/src/libclut.h @@ -23,16 +23,283 @@ +/* Not documented, may be removed or modified in the future. */ +#define LIBCLUT_ILLUMINANT_A .white_x = 0.44757, .white_y = 0.40745, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_B .white_x = 0.34842, .white_y = 0.35161, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_C .white_x = 0.31006, .white_y = 0.31616, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_D50 .white_x = 0.34567, .white_y = 0.35850, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_D55 .white_x = 0.33242, .white_y = 0.34743, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_D65 .white_x = 0.31271, .white_y = 0.32902, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_D75 .white_x = 0.29902, .white_y = 0.31485, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_E .white_x = 1. / 3, .white_y = 1. / 3, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_F1 .white_x = 0.31310, .white_y = 0.33727, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_F2 .white_x = 0.37208, .white_y = 0.37529, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_F3 .white_x = 0.40910, .white_y = 0.39430, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_F4 .white_x = 0.44018, .white_y = 0.40329, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_F5 .white_x = 0.31379, .white_y = 0.34531, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_F6 .white_x = 0.37790, .white_y = 0.38835, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_F7 .white_x = 0.31292, .white_y = 0.32933, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_F8 .white_x = 0.34588, .white_y = 0.35875, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_F9 .white_x = 0.37417, .white_y = 0.37281, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_F10 .white_x = 0.34609, .white_y = 0.35986, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_F11 .white_x = 0.38052, .white_y = 0.37713, .white_Y = 1 +#define LIBCLUT_ILLUMINANT_F12 .white_x = 0.43695, .white_y = 0.40441, .white_Y = 1 + /** - * Initialiser for `struct libclut_rgb_colourspace` with the values + * Initialiser for `struct libclut_rgb_colour_space` with the values * of the sRGB colour space. + * + * sRGB does not use a regular gamma function, but rather two different + * functions. `libclut_model_linear_to_standard1` and + * and `libclut_model_standard_to_linear1` can be used so to convert + * between sRGB and linear sRGB. */ -#define LIBCLUT_RGB_COLOURSPACE_SRGB_INITIALISER \ - { \ - .red_x = 0.6400, .red_y = 0.3300, .red_Y = 0.212656, \ - .green_x = 0.3000, .green_y = 0.6000, .green_Y = 0.715158, \ - .blue_x = 0.1500, .blue_y = 0.0600, .blue_Y = 0.072186, \ - .white_x = 0.31271, .white_y = 0.32902, .white_Y = 1.0000 \ +#define LIBCLUT_RGB_COLOUR_SPACE_SRGB_INITIALISER \ + { \ + .red_x = 0.6400, .red_y = 0.3300, .red_Y = 0.212656, \ + .green_x = 0.3000, .green_y = 0.6000, .green_Y = 0.715158, \ + .blue_x = 0.1500, .blue_y = 0.0600, .blue_Y = 0.072186, \ + LIBCLUT_ILLUMINANT_D65 \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the Adobe RGB (1998) colour space. + * + * This gamma colour space's gamma is 2.2. It cannot be used with + * RGB colour space conversion unless the values are tranlated into + * using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_ADOBE_RGB_INITIALISER \ + { \ + .red_x = 0.6400, .red_y = 0.3300, .red_Y = 0.297361, \ + .green_x = 0.2100, .green_y = 0.7100, .green_Y = 0.627355, \ + .blue_x = 0.1500, .blue_y = 0.0600, .blue_Y = 0.075285, \ + LIBCLUT_ILLUMINANT_D65 \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the Apple RGB colour space. + * + * This gamma colour space's gamma is 1.8. It cannot be used with + * RGB colour space conversion unless the values are tranlated into + * using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_APPLE_RGB_INITIALISER \ + { \ + .red_x = 0.6250, .red_y = 0.3400, .red_Y = 0.244634, \ + .green_x = 0.2800, .green_y = 0.5950, .green_Y = 0.672034, \ + .blue_x = 0.1550, .blue_y = 0.0700, .blue_Y = 0.083332, \ + LIBCLUT_ILLUMINANT_D65 \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the Best RGB colour space. + * + * This gamma colour space's gamma is 2.2. It cannot be used with + * RGB colour space conversion unless the values are tranlated into + * using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_BEST_RGB_INITIALISER \ + { \ + .red_x = 0.7347, .red_y = 0.2653, .red_Y = 0.228457, \ + .green_x = 0.2150, .green_y = 0.7750, .green_Y = 0.737352, \ + .blue_x = 0.1300, .blue_y = 0.0350, .blue_Y = 0.034191, \ + LIBCLUT_ILLUMINANT_D50 \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the Beta RGB colour space. + * + * This gamma colour space's gamma is 2.2. It cannot be used with + * RGB colour space conversion unless the values are tranlated into + * using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_BETA_RGB_INITIALISER \ + { \ + .red_x = 0.6888, .red_y = 0.3112, .red_Y = 0.303273, \ + .green_x = 0.1986, .green_y = 0.7551, .green_Y = 0.663786, \ + .blue_x = 0.1265, .blue_y = 0.0352, .blue_Y = 0.032941, \ + LIBCLUT_ILLUMINANT_D50 \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the Bruce RGB colour space. + * + * This gamma colour space's gamma is 2.2. It cannot be used with + * RGB colour space conversion unless the values are tranlated into + * using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_BRUCE_RGB_INITIALISER \ + { \ + .red_x = 0.6400, .red_y = 0.3300, .red_Y = 0.240995, \ + .green_x = 0.2800, .green_y = 0.6500, .green_Y = 0.683554, \ + .blue_x = 0.1500, .blue_y = 0.0600, .blue_Y = 0.075452, \ + LIBCLUT_ILLUMINANT_D65 \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the CIE RGB colour space. + * + * This gamma colour space's gamma is 2.2. It cannot be used with + * RGB colour space conversion unless the values are tranlated into + * using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_CIE_RGB_INITIALISER \ + { \ + .red_x = 0.7350, .red_y = 0.2650, .red_Y = 0.176204, \ + .green_x = 0.2740, .green_y = 0.7170, .green_Y = 0.812985, \ + .blue_x = 0.1670, .blue_y = 0.0090, .blue_Y = 0.010811, \ + LIBCLUT_ILLUMINANT_E \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the ColorMatch RGB colour space. + * + * This gamma colour space's gamma is 1.8. It cannot be used with + * RGB colour space conversion unless the values are tranlated into + * using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_COLORMATCH_RGB_INITIALISER \ + { \ + .red_x = 0.6300, .red_y = 0.3400, .red_Y = 0.274884, \ + .green_x = 0.2950, .green_y = 0.6050, .green_Y = 0.658132, \ + .blue_x = 0.1500, .blue_y = 0.0750, .blue_Y = 0.066985, \ + LIBCLUT_ILLUMINANT_D50 \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the Don RGB 4 colour space. + * + * This gamma colour space's gamma is 2.2. It cannot be used with + * RGB colour space conversion unless the values are tranlated into + * using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_DON_RGB_4_INITIALISER \ + { \ + .red_x = 0.6960, .red_y = 0.3000, .red_Y = 0.278350, \ + .green_x = 0.2150, .green_y = 0.7650, .green_Y = 0.687970, \ + .blue_x = 0.1300, .blue_y = 0.0350, .blue_Y = 0.033680, \ + LIBCLUT_ILLUMINANT_D50 \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the ECI RGB v2 colour space. + * + * This gamma colour space's used the L* gamma function. It cannot + * be used with RGB colour space conversion unless the values are + * tranlated into using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_ECI_RGB_V2_INITIALISER \ + { \ + .red_x = 0.6700, .red_y = 0.3300, .red_Y = 0.320250, \ + .green_x = 0.2100, .green_y = 0.7100, .green_Y = 0.602071, \ + .blue_x = 0.1400, .blue_y = 0.0800, .blue_Y = 0.077679, \ + LIBCLUT_ILLUMINANT_D50 \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the Ekta Space PS5 colour space. + * + * This gamma colour space's gamma is 2.2. It cannot be used with + * RGB colour space conversion unless the values are tranlated into + * using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_EKTA_SPACE_PS5_INITIALISER \ + { \ + .red_x = 0.6950, .red_y = 0.3050, .red_Y = 0.260629, \ + .green_x = 0.2600, .green_y = 0.7000, .green_Y = 0.734946, \ + .blue_x = 0.1100, .blue_y = 0.0050, .blue_Y = 0.004425, \ + LIBCLUT_ILLUMINANT_D50 \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the NTSC RGB colour space. + * + * This gamma colour space's gamma is 2.2. It cannot be used with + * RGB colour space conversion unless the values are tranlated into + * using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_NTSC_RGB_INITIALISER \ + { \ + .red_x = 0.6700, .red_y = 0.3300, .red_Y = 0.298839, \ + .green_x = 0.2100, .green_y = 0.7100, .green_Y = 0.586811, \ + .blue_x = 0.1400, .blue_y = 0.0800, .blue_Y = 0.114350, \ + LIBCLUT_ILLUMINANT_C \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the PAL/SECAM RGB colour space. + * + * This gamma colour space's gamma is 2.2. It cannot be used with + * RGB colour space conversion unless the values are tranlated into + * using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_PAL_SECAM_RGB_INITIALISER \ + { \ + .red_x = 0.6400, .red_y = 0.3300, .red_Y = 0.222021, \ + .green_x = 0.2900, .green_y = 0.6000, .green_Y = 0.706645, \ + .blue_x = 0.1500, .blue_y = 0.0600, .blue_Y = 0.071334, \ + LIBCLUT_ILLUMINANT_D65 \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the ProPhoto RGB colour space. + * + * This gamma colour space's gamma is 1.8. It cannot be used with + * RGB colour space conversion unless the values are tranlated into + * using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_PROPHOTO_RGB_INITIALISER \ + { \ + .red_x = 0.7347, .red_y = 0.2653, .red_Y = 0.288040, \ + .green_x = 0.1596, .green_y = 0.8404, .green_Y = 0.711874, \ + .blue_x = 0.0366, .blue_y = 0.0001, .blue_Y = 0.000086, \ + LIBCLUT_ILLUMINANT_D50 \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the SMPTE-C RGB colour space. + * + * This gamma colour space's gamma is 2.2. It cannot be used with + * RGB colour space conversion unless the values are tranlated into + * using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_SMPTE_C_RGB_INITIALISER \ + { \ + .red_x = 0.6300, .red_y = 0.3400, .red_Y = 0.212395, \ + .green_x = 0.3100, .green_y = 0.5950, .green_Y = 0.701049, \ + .blue_x = 0.1550, .blue_y = 0.0700, .blue_Y = 0.086556, \ + LIBCLUT_ILLUMINANT_D65 \ + } + +/** + * Initialiser for `struct libclut_rgb_colour_space` with the values + * of the Wide Gamut RGB colour space. + * + * This gamma colour space's gamma is 2.2. It cannot be used with + * RGB colour space conversion unless the values are tranlated into + * using the sRGB gamma function. + */ +#define LIBCLUT_RGB_COLOUR_SPACE_WIDE_GAMUT_RGB_INITIALISER \ + { \ + .red_x = 0.7350, .red_y = 0.2650, .red_Y = 0.258187, \ + .green_x = 0.1150, .green_y = 0.8260, .green_Y = 0.724938, \ + .blue_x = 0.1570, .blue_y = 0.0180, .blue_Y = 0.016875, \ + LIBCLUT_ILLUMINANT_D50 \ } @@ -40,7 +307,7 @@ /** * RGB colour space structure. */ -typedef struct libclut_rgb_colourspace +typedef struct libclut_rgb_colour_space { /** * The x-component of the red colour's xyY value. @@ -101,13 +368,13 @@ typedef struct libclut_rgb_colourspace * The Y-component of the white point's xyY value. */ double white_Y; -} libclut_rgb_colourspace_t; +} libclut_rgb_colour_space_t; /** - * Matrix date-type for colourspace conversion. + * Matrix date-type for colour space conversion. */ -typedef double libclut_colourspace_conversion_matrix_t[3][3]; +typedef double libclut_colour_space_conversion_matrix_t[3][3]; @@ -316,6 +583,210 @@ static inline int libclut_0__(double x) { return libclut_eq__(x, 0); } /** + * Convert the curves between two RGB colour spaces. + * + * Both RGB colour space must have same gamma functions as sRGB. + * + * Requires that `clut->red_size`, `clut->green_size` + * and `clut->blue_size` are equal. + * + * None of the parameter may have side-effects. + * + * Requires linking with '-lclut', or '-lm' if + * `libclut_model_linear_to_standard1`, + * `libclut_model_standard_to_linear1`, or + * `libclut_model_convert_rgb` is not undefined. + * + * @param clut Pointer to the gamma ramps, must have the arrays + * `red`, `green`, and `blue`, and the scalars + * `red_size`, `green_size`, and `blue_size`. Ramp + * structures from libgamma or libcoopgamma can be used. + * @param max The maximum value on each stop in the ramps. + * @param type The data type used for each stop in the ramps. + * @param m Conversion matrix. Can be created with + * `libclut_model_get_rgb_conversion_matrix`. + * @param trunc Truncate values that are out of gamut. + */ +#define libclut_convert_rgb_inplace(clut, max, type, m, trunc) \ + do \ + { \ + double m__ = (double)(max), r__, g__, b__; \ + size_t i__, n__ = (clut)->red_size; \ + for (i__ = 0; i__ < n__; i__++) \ + { \ + r__ = (clut)->red[i__] / m__; \ + g__ = (clut)->green[i__] / m__; \ + b__ = (clut)->blue[i__] / m__; \ + libclut_model_convert_rgb(r__, g__, b__, m, &r__, &g__, &b__); \ + r__ *= m__; \ + g__ *= m__; \ + b__ *= m__; \ + if (trunc) \ + { \ + if (r__ < 0) \ + r__ = 0; \ + else if (r__ > m__) \ + r__ = m__; \ + if (g__ < 0) \ + g__ = 0; \ + else if (g__ > m__) \ + g__ = m__; \ + if (b__ < 0) \ + b__ = 0; \ + else if (b__ > m__) \ + b__ = m__; \ + } \ + (clut)->red[i__] = (type)r__; \ + (clut)->green[i__] = (type)g__; \ + (clut)->blue[i__] = (type)b__; \ + } \ + } \ + while (0) + + +/** + * Convert the curves between two RGB colour spaces. + * + * Both RGB colour space must have same gamma functions as sRGB. + * + * None of the parameter may have side-effects. + * + * Requires linking with '-lclut' if + * `libclut_model_linear_to_standard1`, + * `libclut_model_standard_to_linear1`, or + * `libclut_model_convert_rgb` is not undefined. + * Always requires linking with '-lm'. + * + * @param clut Pointer to the input gamma ramps, must have the + * arrays `red`, `green`, and `blue`, and the scalars + * `red_size`, `green_size`, and `blue_size`. Ramp + * structures from libgamma or libcoopgamma can be used. + * @param max The maximum value on each stop in the ramps. + * @param type The data type used for each stop in the ramps. + * @param m Conversion matrix. Can be created with + * `libclut_model_get_rgb_conversion_matrix`. + * @param trunc Truncate values that are out of gamut. + * @param out Pointer to the output gamma ramps, must have the + * arrays `red`, `green`, and `blue`, and the scalars + * `red_size`, `green_size`, and `blue_size`. Ramp + * structures from libgamma or libcoopgamma can be used. + */ +#define libclut_convert_rgb(clut, max, type, m, trunc, out) \ + do \ + { \ + double m__ = (double)(max), r__, g__, b__, x__, y__; \ + size_t rn__ = (clut)->red_size; \ + size_t gn__ = (clut)->green_size; \ + size_t bn__ = (clut)->blue_size; \ + double w__; \ + size_t i__, j__, jj__; \ + for (i__ = 0; i__ < rn__; i__++) \ + { \ + w__ = (double)i__ * gn__ / rn__; \ + j__ = (size_t)w__; \ + jj__ = j__ == gn__ ? j__ : (j__ + 1); \ + w__ = fmod(j__, (double)1); \ + x__ = (clut)->green[j__] / m__; \ + y__ = (clut)->green[jj__] / m__; \ + x__ = libclut_model_standard_to_linear1(x__); \ + y__ = libclut_model_standard_to_linear1(y__); \ + g__ = x__ * (1 - w__) + y__ * w__; \ + \ + w__ = (double)i__ * bn__ / rn__; \ + j__ = (size_t)w__; \ + jj__ = j__ == bn__ ? j__ : (j__ + 1); \ + w__ = fmod(j__, (double)1); \ + x__ = (clut)->blue[j__] / m__; \ + y__ = (clut)->blue[jj__] / m__; \ + x__ = libclut_model_standard_to_linear1(x__); \ + y__ = libclut_model_standard_to_linear1(y__); \ + b__ = x__ * (1 - w__) + y__ * w__; \ + \ + r__ = (M)[0][0] * r__ + (M)[0][1] * g__ + (M)[0][2] * b__; \ + r__ = libclut_model_linear_to_standard1(r__); \ + r__ *= m__; \ + if (trunc) \ + { \ + if (r__ < 0) \ + r__ = 0; \ + else if (r__ > m__) \ + r__ = m__; \ + } \ + (out)->red[i__] = (type)r__; \ + } \ + for (i__ = 0; i__ < gn__; i__++) \ + { \ + w__ = (double)i__ * rn__ / gn__; \ + j__ = (size_t)w__; \ + jj__ = j__ == rn__ ? j__ : (j__ + 1); \ + w__ = fmod(j__, (double)1); \ + x__ = (clut)->red[j__] / m__; \ + y__ = (clut)->red[jj__] / m__; \ + x__ = libclut_model_standard_to_linear1(x__); \ + y__ = libclut_model_standard_to_linear1(y__); \ + r__ = x__ * (1 - w__) + y__ * w__; \ + \ + w__ = (double)i__ * bn__ / gn__; \ + j__ = (size_t)w__; \ + jj__ = j__ == bn__ ? j__ : (j__ + 1); \ + w__ = fmod(j__, (double)1); \ + x__ = (clut)->blue[j__] / m__; \ + y__ = (clut)->blue[jj__] / m__; \ + x__ = libclut_model_standard_to_linear1(x__); \ + y__ = libclut_model_standard_to_linear1(y__); \ + b__ = x__ * (1 - w__) + y__ * w__; \ + \ + g__ = (M)[1][0] * r__ + (M)[0][1] * g__ + (M)[1][2] * b__; \ + g__ = libclut_model_linear_to_standard1(g__); \ + g__ *= m__; \ + if (trunc) \ + { \ + if (g__ < 0) \ + g__ = 0; \ + else if (g__ > m__) \ + g__ = m__; \ + } \ + (out)->green[i__] = (type)g__; \ + } \ + for (i__ = 0; i__ < bn__; i__++) \ + { \ + w__ = (double)i__ * rn__ / bn__; \ + j__ = (size_t)w__; \ + jj__ = j__ == rn__ ? j__ : (j__ + 1); \ + w__ = fmod(j__, (double)1); \ + x__ = (clut)->red[j__] / m__; \ + y__ = (clut)->red[jj__] / m__; \ + x__ = libclut_model_standard_to_linear1(x__); \ + y__ = libclut_model_standard_to_linear1(y__); \ + r__ = x__ * (1 - w__) + y__ * w__; \ + \ + w__ = (double)i__ * gn__ / bn__; \ + j__ = (size_t)w__; \ + jj__ = j__ == gn__ ? j__ : (j__ + 1); \ + w__ = fmod(j__, (double)1); \ + x__ = (clut)->green[j__] / m__; \ + y__ = (clut)->green[jj__] / m__; \ + x__ = libclut_model_standard_to_linear1(x__); \ + y__ = libclut_model_standard_to_linear1(y__); \ + g__ = x__ * (1 - w__) + y__ * w__; \ + \ + b__ = (M)[2][0] * r__ + (M)[2][1] * g__ + (M)[2][2] * b__; \ + b__ = libclut_model_linear_to_standard1(b__); \ + b__ *= m__; \ + if (trunc) \ + { \ + if (b__ < 0) \ + b__ = 0; \ + else if (b__ > m__) \ + b__ = m__; \ + } \ + (out)->blue[i__] = (type)b__; \ + } \ + } \ + while (0) + + +/** * Apply gamma correction on the colour curves. * * None of the parameter may have side-effects. @@ -1170,9 +1641,6 @@ static inline int libclut_0__(double x) { return libclut_eq__(x, 0); } (size_t)((double)(i) * (double)(out) / (double)(in)) -/* TODO libclut_convert_rgb */ - - #if defined(__GNUC__) && !defined(__clang__) # define LIBCLUT_GCC_ONLY__(x) x @@ -1483,27 +1951,27 @@ void (libclut_model_cielab_to_ciexyz)(double, double, double, double*, double*, /** * Create a matrix for converting values between - * two RGB colourspaces. + * two RGB colour spaces. * - * @param from The input colourspace, the Y-component is only necessary for the whitepoint. - * @param to The output colourspace, the Y-component is only necessary for the whitepoint. + * @param from The input colour space, the Y-component is only necessary for the whitepoint. + * @param to The output colour space, the Y-component is only necessary for the whitepoint. * @param M Output matrix for conversion from `from` to `to`. * @param Minv Output matrix for conversion from `to` to `from`, may be `NULL`. * @return Zero on success, -1 on error. * - * @throws EINVAL The colourspace cannot be used. + * @throws EINVAL The colour space cannot be used. */ LIBCLUT_GCC_ONLY__(__attribute__((__leaf__))) -int libclut_model_get_rgb_conversion_matrix(const libclut_rgb_colourspace_t*, - const libclut_rgb_colourspace_t*, - libclut_colourspace_conversion_matrix_t, - libclut_colourspace_conversion_matrix_t); -/* TODO doc libclut_model_get_rgb_conversion_matrix */ +int libclut_model_get_rgb_conversion_matrix(const libclut_rgb_colour_space_t*, + const libclut_rgb_colour_space_t*, + libclut_colour_space_conversion_matrix_t, + libclut_colour_space_conversion_matrix_t); /** - * Convert an RGB colour into another RGB colourspace. - * None of the parameter may have side-effects. + * Convert an RGB colour into another RGB colour space. + * + * Both RGB colour space must have same gamma functions as RGB. * * Requires linking with '-lclut', or '-lm' if * `libclut_model_standard_to_linear1` or @@ -1519,7 +1987,7 @@ int libclut_model_get_rgb_conversion_matrix(const libclut_rgb_colourspace_t*, * @param out_b Output parameter for the new blue component. */ LIBCLUT_GCC_ONLY__(__attribute__((__leaf__))) -void (libclut_model_convert_rgb)(double, double, double, libclut_colourspace_conversion_matrix_t, +void (libclut_model_convert_rgb)(double, double, double, libclut_colour_space_conversion_matrix_t, double *, double *, double *); #define libclut_model_convert_rgb(r, g, b, M, out_r, out_g, out_b) \ do \ @@ -1532,7 +2000,6 @@ void (libclut_model_convert_rgb)(double, double, double, libclut_colourspace_con *(out_b) = libclut_model_linear_to_standard1((M)[2][0] * r__ + (M)[2][1] * g__ + (M)[2][2] * b__); \ } \ while (0) -/* TODO libclut_model_convert_rgb */ |