From 5b88d89ac6498eccd71f60981e5fd42da822852c Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Sat, 2 Jan 2016 06:17:35 +0100 Subject: parser for 10deg MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/parse_10deg.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 src/parse_10deg.c diff --git a/src/parse_10deg.c b/src/parse_10deg.c new file mode 100644 index 0000000..0b34050 --- /dev/null +++ b/src/parse_10deg.c @@ -0,0 +1,71 @@ +/** + * Copyright © 2016 Mattias Andrée + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ +#include +#include +#include +#include + +#define HIGHEST 40000 +#define LOWEST 1000 +#define DELTA 100 +#define EXPECTED_ELEMENTS ((HIGHEST - LOWEST) / DELTA + 1) + + + +static void +ciexyy_to_srgb(double x, double y, double Y, double *r, double *g, double *b) +{ +#define SRGB(C) (((C) <= 0.0031308) ? (12.92 * (C)) : ((1.0 + 0.055) * pow((C), 1.0 / 2.4) - 0.055)) + double X, Z; + + /* Convert CIE xyY to CIE XYZ. */ + X = Y * (y == 0 ? 0 : (x / y)); + Z = Y * (y == 0 ? 0 : ((1 - x - y) / y)); + + /* Convert CIE XYZ to [0, 1] linear RGB. (ciexyz_to_linear) */ + *r = ( 3.240450 * X) + (-1.537140 * Y) + (-0.4985320 * Z); + *g = (-0.969266 * X) + ( 1.876010 * Y) + ( 0.0415561 * Z); + *b = (0.0556434 * X) + (-0.204026 * Y) + ( 1.0572300 * Z); + + /* Convert [0, 1] linear RGB to [0, 1] sRGB. */ + SRGB(*r), SRGB(*g), SRGB(*b); +} + + +int main(void) +{ + double xyrgb[5]; + struct stat attr; + + while (fscanf(stdin, "%lf %lf\n", xyrgb + 0, xyrgb + 1) == 2) { + ciexyy_to_srgb(xyrgb[0], xyrgb[1], 1.0, xyrgb + 2, xyrgb + 3, xyrgb + 4); + if (write(1, xyrgb, sizeof(xyrgb)) < (ssize_t)sizeof(xyrgb)) + return perror(""), 1; + } + if (fstat(1, &attr)) + return perror(""), 1; + if ((size_t)(attr.st_size) != EXPECTED_ELEMENTS * 5 * sizeof(double)) + return 1; + + return 0; +} + -- cgit v1.2.3-70-g09d2