/** * Copyright © 2016 Mattias Andrée * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #ifndef LIBCLUT_H #define LIBCLUT_H #include /** * Modify a ramp. * * None of the parameter may have side-effects. * * This is intended for internal use. * * @param ramp Pointer to the gamma ramps, must have and array * named `channel` and a scalar named `channel` followed * by "_size". * @param channel The channel, must be either "red", "green", or "blue". * @param type The data type used for each stop in the ramps. * @param expr Expression that evalutes the value a stop should have. * It can use the variable `LIBCLUT_VALUE` to get the * current value of the stop. */ #define libclut__(ramp, channel, type, expr) \ do \ { \ size_t i__, n__ = (ramp)->channel##_size; \ type LIBCLUT_VALUE; \ for (i__ = 0; i__ < n__; i__++) \ { \ LIBCLUT_VALUE = (ramp)->channel[i__]; \ (ramp)->channel[i__] = (type)(expr); \ } \ } \ while (0) /** * Apply contrast correction on the colour curves using sRGB. * * In this context, contrast is a measure of difference between * the whitepoint and blackpoint, if the difference is 0 than * they are both grey. * * None of the parameter may have side-effects. * * @param ramp 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 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 r The contrast parameter for the red curve. * @param g The contrast parameter for the green curve. * @param b The contrast parameter for the blue curve. */ #define libclut_rgb_contrast(ramp, max, type, r, g, b) \ do \ { \ if (r != 1.0) libclut__(ramp, red, type, LIBCLUT_VALUE - (max) / 2.0 * r + (max) / 2.0); \ if (g != 1.0) libclut__(ramp, green, type, LIBCLUT_VALUE - (max) / 2.0 * g + (max) / 2.0); \ if (b != 1.0) libclut__(ramp, blue, type, LIBCLUT_VALUE - (max) / 2.0 * b + (max) / 2.0); \ } \ while (0) /** * Apply contrast correction on the colour curves using CIE xyY. * * In this context, contrast is a measure of difference between * the whitepoint and blackpoint, if the difference is 0 than * they are both grey. * * None of the parameter may have side-effects. * * @param ramp 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 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 r The contrast parameter for the red curve. * @param g The contrast parameter for the green curve. * @param b The contrast parameter for the blue curve. */ #define libclut_cie_contrast(ramp, max, type, r, g, b) \ do \ { \ size_t rn__ = (ramp)->red_size; \ size_t gn__ = (ramp)->green_size; \ size_t bn__ = (ramp)->blue_size; \ size_t i__; \ double x__, y__, Y__, r__, g__, b__; \ type* rs__ = (ramp)->red; \ type* gs__ = (ramp)->green; \ type* bs__ = (ramp)->blue; \ if ((r == g) && (g == b) && (rn__ == gn__) && (gn__ == bn__)) \ { \ if (r == 1.0) \ break; \ for (i__ = 0; i__ < rn__; i__) \ { \ libclut_model_srgb_to_ciexyy(rs__[i__] / ((double)(max)), gs__[i__] / ((double)(max)), \ bs__[i__] / ((double)(max)), &x__, &y__, &Y__); \ libclut_model_ciexyy_to_srgb(x__, y__, (Y__ - 0.5) * r * 0.5, &r__, &g__, &b__); \ rs__[i__] = (type)(r__ * (double)(max)); \ gs__[i__] = (type)(g__ * (double)(max)); \ bs__[i__] = (type)(b__ * (double)(max)); \ } \ } \ else \ { \ if ((r == 1.0) && (g == 1.0) && (b == 1.0)) \ break; \ libclut_model_srgb_to_ciexyy(rs__[i__] / ((double)(max)), gs__[i__] / ((double)(max)), \ bs__[i__] / ((double)(max)), &x__, &y__, &Y__); \ for (i__ = 0; i__ < rn__; i__) \ { \ if (r != 1.0) \ { \ libclut_model_ciexyy_to_srgb(x__, y__, (Y__ - 0.5) * r + 0.5, &r__, &g__, &b__); \ rs__[i__] = (type)(r__ * (double)(max)); \ } \ if (g != 1.0) \ { \ libclut_model_ciexyy_to_srgb(x__, y__, (Y__ - 0.5) * g + 0.5, &r__, &g__, &b__); \ gs__[i__] = (type)(g__ * (double)(max)); \ } \ if (b != 1.0) \ { \ libclut_model_ciexyy_to_srgb(x__, y__, (Y__ - 0.5) * b + 0.5, &r__, &g__, &b__); \ bs__[i__] = (type)(b__ * (double)(max)); \ } \ } \ } \ } \ while (0) /** * Apply brightness correction on the colour curves using sRGB. * * In this context, brightness is a measure of the whiteness of the whitepoint. * * None of the parameter may have side-effects. * * @param ramp 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 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 r The brightness parameter for the red curve. * @param g The brightness parameter for the green curve. * @param b The brightness parameter for the blue curve. */ #define libclut_rgb_brightness(ramp, max, type, r, g, b) \ do \ { \ if (r != 1.0) libclut__(ramp, red, type, LIBCLUT_VALUE * r); \ if (g != 1.0) libclut__(ramp, green, type, LIBCLUT_VALUE * g); \ if (b != 1.0) libclut__(ramp, blue, type, LIBCLUT_VALUE * b); \ } \ while (0) /** * Apply brightness correction on the colour curves using CIE xyY. * * In this context, brightness is a measure of the whiteness of the whitepoint. * * None of the parameter may have side-effects. * * @param ramp 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 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 r The contrast parameter for the red curve. * @param g The contrast parameter for the green curve. * @param b The contrast parameter for the blue curve. */ #define libclut_cie_contrast(ramp, max, type, r, g, b) \ do \ { \ size_t rn__ = (ramp)->red_size; \ size_t gn__ = (ramp)->green_size; \ size_t bn__ = (ramp)->blue_size; \ size_t i__; \ double x__, y__, Y__, r__, g__, b__; \ type* rs__ = (ramp)->red; \ type* gs__ = (ramp)->green; \ type* bs__ = (ramp)->blue; \ if ((r == g) && (g == b) && (rn__ == gn__) && (gn__ == bn__)) \ { \ if (r == 1.0) \ break; \ for (i__ = 0; i__ < rn__; i__) \ { \ libclut_model_srgb_to_ciexyy(rs__[i__] / ((double)(max)), gs__[i__] / ((double)(max)), \ bs__[i__] / ((double)(max)), &x__, &y__, &Y__); \ libclut_model_ciexyy_to_srgb(x__, y__, Y__ * r, &r__, &g__, &b__); \ rs__[i__] = (type)(r__ * (double)(max)); \ gs__[i__] = (type)(g__ * (double)(max)); \ bs__[i__] = (type)(b__ * (double)(max)); \ } \ } \ else \ { \ if ((r == 1.0) && (g == 1.0) && (b == 1.0)) \ break; \ libclut_model_srgb_to_ciexyy(rs__[i__] / ((double)(max)), gs__[i__] / ((double)(max)), \ bs__[i__] / ((double)(max)), &x__, &y__, &Y__); \ for (i__ = 0; i__ < rn__; i__) \ { \ if (r != 1.0) \ { \ libclut_model_ciexyy_to_srgb(x__, y__, Y__ * r, &r__, &g__, &b__); \ rs__[i__] = (type)(r__ * (double)(max)); \ } \ if (g != 1.0) \ { \ libclut_model_ciexyy_to_srgb(x__, y__, Y__ * g, &r__, &g__, &b__); \ gs__[i__] = (type)(g__ * (double)(max)); \ } \ if (b != 1.0) \ { \ libclut_model_ciexyy_to_srgb(x__, y__, Y__ * b, &r__, &g__, &b__); \ bs__[i__] = (type)(b__ * (double)(max)); \ } \ } \ } \ } \ while (0) #endif