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-rw-r--r--src/cg-gamma.c549
1 files changed, 549 insertions, 0 deletions
diff --git a/src/cg-gamma.c b/src/cg-gamma.c
new file mode 100644
index 0000000..8d2ab0b
--- /dev/null
+++ b/src/cg-gamma.c
@@ -0,0 +1,549 @@
+/**
+ * cg-tools -- Cooperative gamma-enabled tools
+ * Copyright (C) 2016 Mattias Andrée (maandree@kth.se)
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+#define _DEFAULT_SOURCE
+#define _BSD_SOURCE
+
+#include "cg-base.h"
+
+#include <libclut.h>
+
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+
+
+/**
+ * The default filter priority for the program
+ */
+const int64_t default_priority = 0;
+
+/**
+ * The default class for the program
+ */
+char* const default_class = PKGNAME "::cg-gamma::standard";
+
+
+
+/**
+ * -d: keep process alive and remove filter on death
+ */
+static int dflag = 0;
+
+/**
+ * -x: remove filter rather than adding it
+ */
+static int xflag = 0;
+
+/**
+ * -f: gamma listing file
+ */
+static char* fflag = NULL;
+
+/**
+ * The gamma of the red channel
+ */
+static double rgamma = 1;
+
+/**
+ * The gamma of the green channel
+ */
+static double ggamma = 1;
+
+/**
+ * The gamma of the blue channel
+ */
+static double bgamma = 1;
+
+/**
+ * `NULL`-terminated list of output
+ * names list in the configuration file
+ */
+static char** names = NULL;
+
+/**
+ * The gamma of the red channel on monitor
+ * with same index in `names`
+ */
+static double* rgammas = NULL;
+
+/**
+ * The gamma of the green channel on monitor
+ * with same index in `names`
+ */
+static double* ggammas = NULL;
+
+/**
+ * The gamma of the blue channel on monitor
+ * with same index in `names`
+ */
+static double* bgammas = NULL;
+
+
+
+/**
+ * Print usage information and exit
+ */
+void usage(void)
+{
+ fprintf(stderr,
+ "Usage: %s [-M method] [-S site] [-c crtc]... [-R rule] "
+ "(-d | [-p priority] [-x] [-f file | all | red green blue])\n",
+ argv0);
+ exit(1);
+}
+
+
+/**
+ * Perform cleanup so valgrind output is clean
+ *
+ * @param ret The value to return
+ * @return `ret` is returned as is
+ */
+static int cleanup(int ret)
+{
+ int saved_errno = errno;
+ if (names != NULL)
+ {
+ char** p = names;
+ while (*p)
+ free(*p++);
+ }
+ free(names);
+ free(rgammas);
+ free(ggammas);
+ free(bgammas);
+ errno = saved_errno;
+ return ret;
+}
+
+
+/**
+ * Handle a command line option
+ *
+ * @param opt The option, it is a NUL-terminate two-character
+ * string starting with either '-' or '+', if the
+ * argument is not recognised, call `usage`. This
+ * string will not be "-M", "-S", "-c", "-p", or "-R".
+ * @param arg The argument associated with `opt`,
+ * `NULL` there is no next argument, if this
+ * parameter is `NULL` but needed, call `usage`
+ * @return 0 if `arg` was not used,
+ * 1 if `arg` was used,
+ * -1 on error
+ */
+int handle_opt(char* opt, char* arg)
+{
+ if (opt[0] == '-')
+ switch (opt[1])
+ {
+ case 'd':
+ if (dflag || xflag)
+ usage();
+ dflag = 1;
+ break;
+ case 'x':
+ if (xflag || dflag)
+ usage();
+ xflag = 1;
+ break;
+ case 'f':
+ if (fflag || !(fflag = arg))
+ usage();
+ return 1;
+ default:
+ usage();
+ }
+ return 0;
+}
+
+
+/**
+ * Get the pathname of a configuration file
+ *
+ * @param confname The filename (excluding directory) of the configuration file
+ * @return The full pathname of the configuration file, `NULL` on error
+ */
+static char* get_conf_file(const char* restrict confname)
+{
+ struct passwd* pw;
+ char* path;
+
+ pw = getpwuid(getuid());
+ if ((pw == NULL) || (pw->pw_dir == NULL))
+ return NULL;
+
+ path = malloc(strlen(pw->pw_dir) + strlen(confname) + sizeof("/.config/"));
+ if (path == NULL)
+ return NULL;
+
+ sprintf(path, "%s/.config/%s", pw->pw_dir, confname);
+
+ if (access(path, F_OK) < 0)
+ sprintf(path, "/etc/%s", confname);
+
+ return path;
+}
+
+
+/**
+ * Parse a non-negative double encoded as a string
+ *
+ * @param out Output parameter for the value
+ * @param str The string
+ * @retunr Zero on success, -1 if the string is invalid
+ */
+static int parse_double(double* restrict out, const char* restrict str)
+{
+ char* end;
+ errno = 0;
+ *out = strtod(str, &end);
+ if (errno || (out < 0) || isinf(*out) || isnan(*out) || *end)
+ return -1;
+ if (!strchr("0123456789.", *str))
+ return -1;
+ return 0;
+}
+
+
+/**
+ * Parse gamma configuration file
+ *
+ * @param pathname The pathname of the file
+ * @return Zero on success, -1 on error
+ */
+static int parse_gamma_file(const char* restrict pathname)
+{
+ int fd, saved_errno;
+ char* line = NULL;
+ size_t size = 0, lineno = 0, ptr = 0, alloc = 0;
+ ssize_t n;
+ FILE* f = NULL;
+ char* p;
+ char* q;
+ char* r;
+ char* g;
+ char* b;
+
+ fd = open(pathname, O_RDONLY);
+ if (fd == -1)
+ return -1;
+
+ f = fdopen(fd, "rb");
+ if (f == NULL)
+ goto fail;
+
+ while (n = getline(&line, &size, f), n >= 0)
+ {
+ lineno += 1;
+
+ if ((n > 0) && (line[n - 1] == '\n'))
+ line[n - 1] = '\0';
+ p = line;
+ while ((*p == ' ') || (*p == '\t')) p++;
+ if ((!*p) || (*p == '#'))
+ continue;
+
+ r = strpbrk(line, " \t");
+ if (r == NULL)
+ goto bad;
+ while (r[1] == ' ' || r[1] == '\t') r++;
+ g = strpbrk(r + 1, " \t");
+ if (g == NULL)
+ goto bad;
+ while (g[1] == ' ' || g[1] == '\t') g++;
+ b = strpbrk(g + 1, " \t");
+ if (b == NULL)
+ goto bad;
+ while (b[1] == ' ' || b[1] == '\t') b++;
+
+ for (;;)
+ {
+ q = strpbrk(b + 1, " \t");
+ if (q == NULL)
+ break;
+ while (q[1] == ' ' || q[1] == '\t') q++;
+ if (!*q)
+ break;
+ r = g, g = b, b = q;
+ }
+
+ *r++ = '\0';
+ *g++ = '\0';
+ *b++ = '\0';
+
+ q = strpbrk(r, " \t");
+ if (q != NULL)
+ *q = '\0';
+ q = strpbrk(g, " \t");
+ if (q != NULL)
+ *q = '\0';
+ q = strpbrk(b, " \t");
+ if (q != NULL)
+ *q = '\0';
+
+ q = strchr(p, '\0');
+ while ((q != p) && ((q[-1] == ' ') || (q[-1] == '\t')))
+ q--;
+ *q = '\0';
+
+ if (ptr == alloc)
+ {
+ void* new;
+ size_t new_size = alloc ? (alloc << 1) : 4;
+
+ new = realloc(rgammas, new_size * sizeof(*rgammas));
+ if (new == NULL)
+ goto fail;
+ rgammas = new;
+
+ new = realloc(ggammas, new_size * sizeof(*ggammas));
+ if (new == NULL)
+ goto fail;
+ ggammas = new;
+
+ new = realloc(bgammas, new_size * sizeof(*bgammas));
+ if (new == NULL)
+ goto fail;
+ bgammas = new;
+
+ new = realloc(names, (new_size + 1) * sizeof(*names));
+ if (new == NULL)
+ goto fail;
+ names = new;
+ memset(names + alloc, 0, (new_size + 1 - alloc) * sizeof(*names));
+
+ alloc = new_size;
+ }
+
+ if ((parse_double(rgammas + ptr, r) < 0) ||
+ (parse_double(ggammas + ptr, g) < 0) ||
+ (parse_double(bgammas + ptr, b) < 0))
+ goto bad;
+ names[ptr] = malloc(strlen(p) + 1);
+ if (names[ptr] == NULL)
+ goto fail;
+ strcpy(names[ptr], p);
+ ptr++;
+
+ continue;
+ bad:
+ fprintf(stderr, "%s: ignoring malformatted line in %s: %zu\n", argv0, pathname, lineno);
+ }
+
+ if (fclose(f) < 0)
+ {
+ f = NULL;
+ goto fail;
+ }
+ close(fd);
+ free(line);
+ return 0;
+ fail:
+ saved_errno = errno;
+ free(line);
+ if (f != NULL)
+ fclose(f);
+ if (fd >= 0)
+ close(fd);
+ errno = saved_errno;
+ return -1;
+}
+
+
+/**
+ * This function is called after the last
+ * call to `handle_opt`
+ *
+ * @param argc The number of unparsed arguments
+ * @param argv `NULL` terminated list of unparsed arguments
+ * @param method The argument associated with the "-M" option
+ * @param site The argument associated with the "-S" option
+ * @param crtcs The arguments associated with the "-c" options, `NULL`-terminated
+ * @param prio The argument associated with the "-p" option
+ * @param rule The argument associated with the "-R" option
+ * @return Zero on success, -1 on error
+ */
+int handle_args(int argc, char* argv[], char* method, char* site,
+ char** crtcs, char* prio, char* rule)
+{
+ int free_fflag = 0, saved_errno;
+ int q = xflag + dflag + (fflag && argc);
+ q += (method != NULL) && !strcmp(method, "?");
+ q += (prio != NULL) && !strcmp(prio, "?");
+ q += (rule != NULL) && (!strcmp(rule, "?") || !strcmp(rule, "??"));
+ for (; *crtcs; crtcs++)
+ q += !strcmp(*crtcs, "?");
+ if ((q > 1) || (xflag && ((fflag != NULL) || (argc > 0) || (prio != NULL))))
+ usage();
+ if (argc == 1)
+ {
+ if (parse_double(&rgamma, argv[0]) < 0)
+ usage();
+ bgamma = ggamma = rgamma;
+ }
+ else if (argc == 3)
+ {
+ if (parse_double(&rgamma, argv[0]) < 0)
+ usage();
+ if (parse_double(&ggamma, argv[1]) < 0)
+ usage();
+ if (parse_double(&bgamma, argv[2]) < 0)
+ usage();
+ }
+ else if (argc)
+ usage();
+ if (!argc && !fflag && !xflag)
+ {
+ fflag = get_conf_file("gamma");
+ if (fflag == NULL)
+ return -1;
+ free_fflag = 1;
+ }
+ if (fflag)
+ if (parse_gamma_file(fflag) < 0)
+ goto fail;
+ if (free_fflag)
+ free(fflag), fflag = NULL;
+ return 0;
+ fail:
+ saved_errno = errno;
+ if (free_fflag)
+ free(fflag), fflag = NULL;
+ errno = saved_errno;
+ return cleanup(-1);
+}
+
+
+/**
+ * Fill a filter
+ *
+ * @param filter The filter to fill
+ * @param r The red gamma
+ * @param g The green gamma
+ * @param b The blue gamma
+ */
+static void fill_filter(libcoopgamma_filter_t* restrict filter, double r, double g, double b)
+{
+ switch (filter->depth)
+ {
+#define X(CONST, MEMBER, MAX, TYPE)\
+ case CONST:\
+ libclut_gamma(&(filter->ramps.MEMBER), MAX, TYPE, r, g, b);\
+ break;
+LIST_DEPTHS
+#undef X
+ default:
+ abort();
+ }
+}
+
+
+/**
+ * The main function for the program-specific code
+ *
+ * @return 0: Success
+ * -1: Error, `errno` set
+ * -2: Error, `cg.error` set
+ * -3: Error, message already printed
+ */
+int start(void)
+{
+ int r;
+ size_t i, j;
+
+ if (xflag)
+ for (i = 0; i < crtcs_n; i++)
+ crtc_updates[i].filter.lifespan = LIBCOOPGAMMA_REMOVE;
+ else if (dflag)
+ for (i = 0; i < crtcs_n; i++)
+ crtc_updates[i].filter.lifespan = LIBCOOPGAMMA_UNTIL_DEATH;
+ else
+ for (i = 0; i < crtcs_n; i++)
+ crtc_updates[i].filter.lifespan = LIBCOOPGAMMA_UNTIL_REMOVAL;
+
+ if (!xflag && (names != NULL))
+ if ((r = make_slaves()) < 0)
+ return cleanup(r);
+
+ if (names == NULL)
+ for (i = 0, r = 1; i < crtcs_n; i++)
+ {
+ if (!(crtc_updates[i].master) || !(crtc_info[i].supported))
+ continue;
+ if (!xflag)
+ fill_filter(&(crtc_updates[i].filter), rgamma, ggamma, bgamma);
+ r = update_filter(i, 0);
+ if ((r == -2) || ((r == -1) && (errno != EAGAIN)))
+ return cleanup(r);
+ if (crtc_updates[i].slaves != NULL)
+ for (j = 0; crtc_updates[i].slaves[j] != 0; j++)
+ {
+ r = update_filter(crtc_updates[i].slaves[j], 0);
+ if ((r == -2) || ((r == -1) && (errno != EAGAIN)))
+ return cleanup(r);
+ }
+ }
+ else
+ for (i = 0, r = 1; i < crtcs_n; i++)
+ {
+ if (!(crtc_info[i].supported))
+ continue;
+ for (j = 0; names[j] != NULL; j++)
+ if (!strcasecmp(crtc_updates[i].filter.crtc, names[j]))
+ {
+ fill_filter(&(crtc_updates[i].filter), rgammas[j], ggammas[j], bgammas[j]);
+ r = update_filter(i, 0);
+ if ((r == -2) || ((r == -1) && (errno != EAGAIN)))
+ return cleanup(r);
+ break;
+ }
+ }
+
+ while (r != 1)
+ if ((r = synchronise(-1)) < 0)
+ return cleanup(r);
+
+ if (!dflag)
+ return cleanup(0);
+
+ if (libcoopgamma_set_nonblocking(&cg, 0) < 0)
+ return cleanup(-1);
+ for (;;)
+ if (libcoopgamma_synchronise(&cg, NULL, 0, &j) < 0)
+ switch (errno)
+ {
+ case 0:
+ break;
+ case ENOTRECOVERABLE:
+ goto enotrecoverable;
+ default:
+ return cleanup(-1);
+ }
+
+ enotrecoverable:
+ for (;;)
+ if (pause() < 0)
+ return cleanup(-1);
+}
+
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