277 lines
7.2 KiB
C
277 lines
7.2 KiB
C
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/* $Id: colour.c,v 1.3 2011/08/22 09:19:51 he Exp $ */
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/*
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* Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include "tmux.h"
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/*
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* Colour to string conversion functions. Bit 8 of the colour means it is one
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* of the 256 colour palette.
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*/
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/* An RGB colour. */
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struct colour_rgb {
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u_char r;
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u_char g;
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u_char b;
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};
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/* 256 colour RGB table, generated on first use. */
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struct colour_rgb *colour_rgb_256;
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void colour_rgb_generate256(void);
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u_int colour_rgb_distance(struct colour_rgb *, struct colour_rgb *);
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int colour_rgb_find(struct colour_rgb *);
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/* Generate 256 colour RGB table. */
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void
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colour_rgb_generate256(void)
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{
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struct colour_rgb *rgb;
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u_int i, r, g, b;
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/*
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* Allocate the table. The first 16 colours are often changed by users
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* and terminals so don't include them.
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*/
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colour_rgb_256 = xcalloc(240, sizeof *colour_rgb_256);
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/* Add the colours first. */
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r = g = b = 0;
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for (i = 240; i > 24; i--) {
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rgb = &colour_rgb_256[240 - i];
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if (r != 0)
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rgb->r = (r * 40) + 55;
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if (g != 0)
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rgb->g = (g * 40) + 55;
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if (b != 0)
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rgb->b = (b * 40) + 55;
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b++;
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if (b > 5) {
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b = 0;
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g++;
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}
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if (g > 5) {
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g = 0;
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r++;
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}
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}
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/* Then add the greys. */
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for (i = 24; i > 0; i--) {
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rgb = &colour_rgb_256[240 - i];
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rgb->r = 8 + (24 - i) * 10;
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rgb->g = 8 + (24 - i) * 10;
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rgb->b = 8 + (24 - i) * 10;
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}
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}
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/* Get a measure of colour RGB distance. */
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u_int
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colour_rgb_distance(struct colour_rgb *rgb1, struct colour_rgb *rgb2)
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{
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int r, g, b;
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r = rgb1->r - rgb2->r;
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g = rgb1->g - rgb2->g;
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b = rgb1->b - rgb2->b;
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return (r * r + g * g + b * b);
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}
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/* Work out the nearest colour from the 256 colour set. */
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int
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colour_rgb_find(struct colour_rgb *rgb)
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{
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u_int distance, lowest;
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u_int colour, i;
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if (colour_rgb_256 == NULL)
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colour_rgb_generate256();
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colour = 16;
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lowest = UINT_MAX;
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for (i = 0; i < 240; i++) {
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distance = colour_rgb_distance(&colour_rgb_256[i], rgb);
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if (distance < lowest) {
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lowest = distance;
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colour = 16 + i;
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}
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}
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return (colour);
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}
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/* Set grid cell foreground colour. */
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void
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colour_set_fg(struct grid_cell *gc, int c)
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{
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if (c & 0x100)
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gc->flags |= GRID_FLAG_FG256;
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gc->fg = c;
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}
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/* Set grid cell background colour. */
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void
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colour_set_bg(struct grid_cell *gc, int c)
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{
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if (c & 0x100)
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gc->flags |= GRID_FLAG_BG256;
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gc->bg = c;
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}
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/* Convert colour to a string. */
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const char *
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colour_tostring(int c)
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{
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static char s[32];
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if (c & 0x100) {
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xsnprintf(s, sizeof s, "colour%u", c & ~0x100);
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return (s);
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}
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switch (c) {
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case 0:
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return ("black");
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case 1:
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return ("red");
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case 2:
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return ("green");
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case 3:
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return ("yellow");
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case 4:
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return ("blue");
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case 5:
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return ("magenta");
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case 6:
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return ("cyan");
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case 7:
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return ("white");
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case 8:
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return ("default");
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}
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return (NULL);
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}
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/* Convert colour from string. */
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int
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colour_fromstring(const char *s)
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{
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const char *errstr;
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const char *cp;
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struct colour_rgb rgb;
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int n;
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if (*s == '#' && strlen(s) == 7) {
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for (cp = s + 1; isxdigit((u_char) *cp); cp++)
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;
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if (*cp != '\0')
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return (-1);
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n = sscanf(s + 1, "%2hhx%2hhx%2hhx", &rgb.r, &rgb.g, &rgb.b);
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if (n != 3)
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return (-1);
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return (colour_rgb_find(&rgb) | 0x100);
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}
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if (strncasecmp(s, "colour", (sizeof "colour") - 1) == 0) {
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n = strtonum(s + (sizeof "colour") - 1, 0, 255, &errstr);
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if (errstr != NULL)
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return (-1);
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return (n | 0x100);
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}
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if (strcasecmp(s, "black") == 0 || (s[0] == '0' && s[1] == '\0'))
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return (0);
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if (strcasecmp(s, "red") == 0 || (s[0] == '1' && s[1] == '\0'))
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return (1);
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if (strcasecmp(s, "green") == 0 || (s[0] == '2' && s[1] == '\0'))
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return (2);
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if (strcasecmp(s, "yellow") == 0 || (s[0] == '3' && s[1] == '\0'))
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return (3);
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if (strcasecmp(s, "blue") == 0 || (s[0] == '4' && s[1] == '\0'))
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return (4);
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if (strcasecmp(s, "magenta") == 0 || (s[0] == '5' && s[1] == '\0'))
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return (5);
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if (strcasecmp(s, "cyan") == 0 || (s[0] == '6' && s[1] == '\0'))
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return (6);
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if (strcasecmp(s, "white") == 0 || (s[0] == '7' && s[1] == '\0'))
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return (7);
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if (strcasecmp(s, "default") == 0 || (s[0] == '8' && s[1] == '\0'))
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return (8);
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return (-1);
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}
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/* Convert 256 colour palette to 16. */
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u_char
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colour_256to16(u_char c)
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{
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static const u_char table[256] = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
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0, 4, 4, 4, 12, 12, 2, 6, 4, 4, 12, 12, 2, 2, 6, 4,
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12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10,
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10, 10, 10, 14, 1, 5, 4, 4, 12, 12, 3, 8, 4, 4, 12, 12,
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2, 2, 6, 4, 12, 12, 2, 2, 2, 6, 12, 12, 10, 10, 10, 10,
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14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 5, 4, 12, 12, 1, 1,
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5, 4, 12, 12, 3, 3, 8, 4, 12, 12, 2, 2, 2, 6, 12, 12,
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10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14, 1, 1, 1, 5,
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12, 12, 1, 1, 1, 5, 12, 12, 1, 1, 1, 5, 12, 12, 3, 3,
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3, 7, 12, 12, 10, 10, 10, 10, 14, 12, 10, 10, 10, 10, 10, 14,
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9, 9, 9, 9, 13, 12, 9, 9, 9, 9, 13, 12, 9, 9, 9, 9,
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13, 12, 9, 9, 9, 9, 13, 12, 11, 11, 11, 11, 7, 12, 10, 10,
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10, 10, 10, 14, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13,
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9, 9, 9, 9, 9, 13, 9, 9, 9, 9, 9, 13, 9, 9, 9, 9,
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9, 13, 11, 11, 11, 11, 11, 15, 0, 0, 0, 0, 0, 0, 8, 8,
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8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 15, 15, 15, 15, 15, 15
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};
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return (table[c]);
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}
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/* Convert 256 colour palette to 88. */
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u_char
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colour_256to88(u_char c)
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{
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static const u_char table[256] = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
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16, 17, 17, 18, 18, 19, 20, 21, 21, 22, 22, 23, 20, 21, 21, 22,
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22, 23, 24, 25, 25, 26, 26, 27, 24, 25, 25, 26, 26, 27, 28, 29,
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29, 30, 30, 31, 32, 33, 33, 34, 34, 35, 36, 37, 37, 38, 38, 39,
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36, 37, 37, 38, 38, 39, 40, 41, 41, 42, 42, 43, 40, 41, 41, 42,
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42, 43, 44, 45, 45, 46, 46, 47, 32, 33, 33, 34, 34, 35, 36, 37,
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37, 38, 38, 39, 36, 37, 37, 38, 38, 39, 40, 41, 41, 42, 42, 43,
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40, 41, 41, 42, 42, 43, 44, 45, 45, 46, 46, 47, 48, 49, 49, 50,
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50, 51, 52, 53, 53, 54, 54, 55, 52, 53, 53, 54, 54, 55, 56, 57,
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57, 58, 58, 59, 56, 57, 57, 58, 58, 59, 60, 61, 61, 62, 62, 63,
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48, 49, 49, 50, 50, 51, 52, 53, 53, 54, 54, 55, 52, 53, 53, 54,
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54, 55, 56, 57, 57, 58, 58, 59, 56, 57, 57, 58, 58, 59, 60, 61,
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61, 62, 62, 63, 64, 65, 65, 66, 66, 67, 68, 69, 69, 70, 70, 71,
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68, 69, 69, 70, 70, 71, 72, 73, 73, 74, 74, 75, 72, 73, 73, 74,
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74, 75, 76, 77, 77, 78, 78, 79, 0, 0, 80, 80, 80, 81, 81, 81,
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82, 82, 82, 83, 83, 83, 84, 84, 84, 85, 85, 85, 86, 86, 86, 87
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};
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return (table[c]);
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}
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