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-rw-r--r--src/coopgamma-server/chaining.c257
-rw-r--r--src/coopgamma-server/chaining.h75
-rw-r--r--src/coopgamma-server/server.c335
-rw-r--r--src/coopgamma-server/server.h93
4 files changed, 760 insertions, 0 deletions
diff --git a/src/coopgamma-server/chaining.c b/src/coopgamma-server/chaining.c
new file mode 100644
index 0000000..b2739c2
--- /dev/null
+++ b/src/coopgamma-server/chaining.c
@@ -0,0 +1,257 @@
+/**
+ * coopgammad -- Cooperative gamma server
+ * 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/>.
+ */
+#include "chaining.h"
+
+#include <libclut.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+
+
+/**
+ * The name of the process
+ */
+extern char* restrict argv0;
+
+
+
+/**
+ * Apply a filter on top of another filter
+ *
+ * @param dest The output for the resulting ramp-trio, must be initialised
+ * @param application The red, green and blue ramps, as one single raw array,
+ * of the filter that should be applied
+ * @param depth -1: `float` stops
+ * -2: `double` stops
+ * Other: the number of bits of each (integral) stop
+ * @param base The CLUT on top of which the new filter should be applied,
+ * this can be the same pointer as `dest`
+ */
+void apply_filter(union gamma_ramps* restrict dest, void* restrict application,
+ int depth, union gamma_ramps* restrict base)
+{
+ union gamma_ramps app;
+ size_t bytedepth;
+ size_t red_width, green_width, blue_width;
+
+ if (depth == -1)
+ bytedepth = sizeof(float);
+ else if (depth == -2)
+ bytedepth = sizeof(double);
+ else
+ bytedepth = (size_t)depth / 8;
+
+ red_width = (app.u8.red_size = base->u8.red_size) * bytedepth;
+ green_width = (app.u8.green_size = base->u8.green_size) * bytedepth;
+ blue_width = (app.u8.blue_size = base->u8.blue_size) * bytedepth;
+
+ app.u8.red = application;
+ app.u8.green = app.u8.red + red_width;
+ app.u8.blue = app.u8.green + green_width;
+
+ if (dest != base)
+ {
+ memcpy(dest->u8.red, base->u8.red, red_width);
+ memcpy(dest->u8.green, base->u8.green, green_width);
+ memcpy(dest->u8.blue, base->u8.blue, blue_width);
+ }
+
+ switch (depth)
+ {
+ case 8:
+ libclut_apply(&(dest->u8), UINT8_MAX, uint8_t, &(app.u8), UINT8_MAX, uint8_t, 1, 1, 1);
+ break;
+ case 16:
+ libclut_apply(&(dest->u16), UINT16_MAX, uint16_t, &(app.u16), UINT16_MAX, uint16_t, 1, 1, 1);
+ break;
+ case 32:
+ libclut_apply(&(dest->u32), UINT32_MAX, uint32_t, &(app.u32), UINT32_MAX, uint32_t, 1, 1, 1);
+ break;
+ case 64:
+ libclut_apply(&(dest->u64), UINT64_MAX, uint64_t, &(app.u64), UINT64_MAX, uint64_t, 1, 1, 1);
+ break;
+ case -1:
+ libclut_apply(&(dest->f), 1.0f, float, &(app.d), 1.0f, float, 1, 1, 1);
+ break;
+ case -2:
+ libclut_apply(&(dest->d), (double)1, double, &(app.f), (double)1, double, 1, 1, 1);
+ break;
+ default:
+ abort();
+ }
+}
+
+
+
+/**
+ * Remove a filter from an output
+ *
+ * @param out The output
+ * @param filter The filter
+ * @return The index of the filter, `out->table_size` if not found
+ */
+static ssize_t remove_filter(struct output* restrict out, struct filter* restrict filter)
+{
+ size_t i, n = out->table_size;
+
+ for (i = 0; i < n; i++)
+ if (!strcmp(filter->class, out->table_filters[i].class))
+ break;
+
+ if (i == out->table_size)
+ {
+ fprintf(stderr, "%s: ignoring attempt to removing non-existing filter on CRTC %s: %s",
+ argv0, out->name, filter->class);
+ return (ssize_t)(out->table_size);
+ }
+
+ filter_destroy(out->table_filters + i);
+ libgamma_gamma_ramps8_destroy(&(out->table_sums[i].u8));
+
+ n = n - i - 1;
+ memmove(out->table_filters + i, out->table_filters + i + 1, n * sizeof(*(out->table_filters)));
+ memmove(out->table_sums + i, out->table_sums + i + 1, n * sizeof(*(out->table_sums)));
+ out->table_size--;
+
+ return (ssize_t)i;
+}
+
+
+/**
+ * Add a filter to an output
+ *
+ * @param out The output
+ * @param filter The filter
+ * @return The index given to the filter, -1 on error
+ */
+ssize_t add_filter(struct output* restrict out, struct filter* restrict filter)
+{
+ size_t i, n = out->table_size;
+ int r = -1;
+
+ /* Remove? */
+ if (filter->lifespan == LIFESPAN_REMOVE)
+ return remove_filter(out, filter);
+
+ /* Update? */
+ for (i = 0; i < n; i++)
+ if (!strcmp(filter->class, out->table_filters[i].class))
+ break;
+ if (i != n)
+ {
+ filter_destroy(out->table_filters + i);
+ out->table_filters[i] = *filter;
+ return (ssize_t)i;
+ }
+
+ /* Add! */
+ for (i = 0; i < n; i++)
+ if (filter->priority > out->table_filters[i].priority)
+ break;
+
+ if (n == out->table_alloc)
+ {
+ void* new;
+
+ new = realloc(out->table_filters, (n + 10) * sizeof(*(out->table_filters)));
+ if (new == NULL)
+ return -1;
+ out->table_filters = new;
+
+ new = realloc(out->table_sums, (n + 10) * sizeof(*(out->table_sums)));
+ if (new == NULL)
+ return -1;
+ out->table_sums = new;
+
+ out->table_alloc += 10;
+ }
+
+ memmove(out->table_filters + i + 1, out->table_filters + i, (n - i) * sizeof(*(out->table_filters)));
+ memmove(out->table_sums + i + 1, out->table_sums + i, (n - i) * sizeof(*(out->table_sums)));
+ out->table_size++;
+
+ COPY_RAMP_SIZES(&(out->table_sums[i].u8), out);
+ switch (out->depth)
+ {
+ case 8: r = libgamma_gamma_ramps8_initialise(&(out->table_sums[i].u8)); break;
+ case 16: r = libgamma_gamma_ramps16_initialise(&(out->table_sums[i].u16)); break;
+ case 32: r = libgamma_gamma_ramps32_initialise(&(out->table_sums[i].u32)); break;
+ case 64: r = libgamma_gamma_ramps64_initialise(&(out->table_sums[i].u64)); break;
+ case -1: r = libgamma_gamma_rampsf_initialise(&(out->table_sums[i].f)); break;
+ case -2: r = libgamma_gamma_rampsd_initialise(&(out->table_sums[i].d)); break;
+ default:
+ abort();
+ }
+ if (r < 0)
+ return -1;
+
+ out->table_filters[i] = *filter;
+
+ return (ssize_t)i;
+}
+
+
+/**
+ * Make identity mapping ramps
+ *
+ * @param ramps Output parameter for the ramps
+ * @param output The output for which the ramps shall be configured
+ * @return Zero on success, -1 on error
+ */
+int make_plain_ramps(union gamma_ramps* restrict ramps, struct output* restrict output)
+{
+ COPY_RAMP_SIZES(&(ramps->u8), output);
+ switch (output->depth)
+ {
+ case 8:
+ if (libgamma_gamma_ramps8_initialise(&(ramps->u8)))
+ return -1;
+ libclut_start_over(&(ramps->u8), UINT8_MAX, uint8_t, 1, 1, 1);
+ break;
+ case 16:
+ if (libgamma_gamma_ramps16_initialise(&(ramps->u16)))
+ return -1;
+ libclut_start_over(&(ramps->u16), UINT16_MAX, uint16_t, 1, 1, 1);
+ break;
+ case 32:
+ if (libgamma_gamma_ramps32_initialise(&(ramps->u32)))
+ return -1;
+ libclut_start_over(&(ramps->u32), UINT32_MAX, uint32_t, 1, 1, 1);
+ break;
+ case 64:
+ if (libgamma_gamma_ramps64_initialise(&(ramps->u64)))
+ return -1;
+ libclut_start_over(&(ramps->u64), UINT64_MAX, uint64_t, 1, 1, 1);
+ break;
+ case -1:
+ if (libgamma_gamma_rampsf_initialise(&(ramps->f)))
+ return -1;
+ libclut_start_over(&(ramps->f), 1.0f, float, 1, 1, 1);
+ break;
+ case -2:
+ if (libgamma_gamma_rampsd_initialise(&(ramps->d)))
+ return -1;
+ libclut_start_over(&(ramps->d), (double)1, double, 1, 1, 1);
+ break;
+ default:
+ abort();
+ }
+ return 0;
+}
+
diff --git a/src/coopgamma-server/chaining.h b/src/coopgamma-server/chaining.h
new file mode 100644
index 0000000..cd31e5a
--- /dev/null
+++ b/src/coopgamma-server/chaining.h
@@ -0,0 +1,75 @@
+/**
+ * coopgammad -- Cooperative gamma server
+ * 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/>.
+ */
+#ifndef COOPGAMMA_SERVER_CHAINING
+#define COOPGAMMA_SERVER_CHAINING
+
+
+#include "../types/output.h"
+
+
+
+#ifndef GCC_ONLY
+# if defined(__GNUC__) && !defined(__clang__)
+# define GCC_ONLY(...) __VA_ARGS__
+# else
+# define GCC_ONLY(...) /* nothing */
+# endif
+#endif
+
+
+
+/**
+ * Apply a filter on top of another filter
+ *
+ * @param dest The output for the resulting ramp-trio, must be initialised
+ * @param application The red, green and blue ramps, as one single raw array,
+ * of the filter that should be applied
+ * @param depth -1: `float` stops
+ * -2: `double` stops
+ * Other: the number of bits of each (integral) stop
+ * @param base The CLUT on top of which the new filter should be applied,
+ * this can be the same pointer as `dest`
+ */
+GCC_ONLY(__attribute__((nonnull)))
+void apply_filter(union gamma_ramps* restrict dest, void* restrict application,
+ int depth, union gamma_ramps* restrict base);
+
+
+/**
+ * Add a filter to an output
+ *
+ * @param output The output
+ * @param filter The filter
+ * @return The index given to the filter, -1 on error
+ */
+GCC_ONLY(__attribute__((nonnull)))
+ssize_t add_filter(struct output* restrict output, struct filter* restrict filter);
+
+/**
+ * Make identity mapping ramps
+ *
+ * @param ramps Output parameter for the ramps
+ * @param output The output for which the ramps shall be configured
+ * @return Zero on success, -1 on error
+ */
+GCC_ONLY(__attribute__((nonnull)))
+int make_plain_ramps(union gamma_ramps* restrict ramps, struct output* restrict output);
+
+
+#endif
+
diff --git a/src/coopgamma-server/server.c b/src/coopgamma-server/server.c
new file mode 100644
index 0000000..8d56119
--- /dev/null
+++ b/src/coopgamma-server/server.c
@@ -0,0 +1,335 @@
+/**
+ * coopgammad -- Cooperative gamma server
+ * 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/>.
+ */
+#include "server.h"
+#include "chaining.h"
+#include "../state.h"
+#include "../communication.h"
+#include "../util.h"
+#include "../gamma-server/server.h"
+
+#include <libclut.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+
+/**
+ * Handle a closed connection
+ *
+ * @param client The file descriptor for the client
+ * @return Zero on success, -1 on error
+ */
+int connection_closed(int client)
+{
+ size_t i, j, k;
+ int remove;
+
+ for (i = 0; i < outputs_n; i++)
+ {
+ struct output* output = outputs + i;
+ ssize_t updated = -1;
+ for (j = k = 0; j < output->table_size; j += !remove, k++)
+ {
+ remove = output->table_filters[j].client == client;
+ remove = remove && (output->table_filters[j].lifespan == LIFESPAN_UNTIL_DEATH);
+ if (remove)
+ {
+ filter_destroy(output->table_filters + j);
+ libgamma_gamma_ramps8_destroy(&(output->table_sums[j].u8));
+ output->table_size -= 1;
+ if (updated == -1)
+ updated = (ssize_t)j;
+ }
+ output->table_filters[j] = output->table_filters[k];
+ output->table_sums[j] = output->table_sums[k];
+ }
+ if (updated >= 0)
+ if (flush_filters(output, (size_t)updated) < 0)
+ return -1;
+ }
+
+ return 0;
+}
+
+
+/**
+ * Handle a ‘Command: get-gamma’ message
+ *
+ * @param conn The index of the connection
+ * @param message_id The value of the ‘Message ID’ header
+ * @param crtc The value of the ‘CRTC’ header
+ * @param coalesce The value of the ‘Coalesce’ header
+ * @param high_priority The value of the ‘High priority’ header
+ * @param low_priority The value of the ‘Low priority’ header
+ * @return Zero on success (even if ignored), -1 on error,
+ * 1 if connection closed
+ */
+int handle_get_gamma(size_t conn, const char* restrict message_id, const char* restrict crtc,
+ const char* restrict coalesce, const char* restrict high_priority,
+ const char* restrict low_priority)
+{
+ struct output* restrict output;
+ int64_t high, low;
+ int coal;
+ char* restrict buf;
+ size_t start, end, len, n, i;
+ char depth[3];
+ char tables[sizeof("Tables: \n") + 3 * sizeof(size_t)];
+
+ if (crtc == NULL) return send_error("protocol error: 'CRTC' header omitted");
+ if (coalesce == NULL) return send_error("protocol error: 'Coalesce' header omitted");
+ if (high_priority == NULL) return send_error("protocol error: 'High priority' header omitted");
+ if (low_priority == NULL) return send_error("protocol error: 'Low priority' header omitted");
+
+ high = (int64_t)atoll(high_priority);
+ low = (int64_t)atoll(low_priority);
+
+ if (!strcmp(coalesce, "yes"))
+ coal = 1;
+ else if (!strcmp(coalesce, "no"))
+ coal = 0;
+ else
+ return send_error("protocol error: recognised value for 'Coalesce' header");
+
+ output = output_find_by_name(crtc, outputs, outputs_n);
+ if (output == NULL)
+ return send_error("selected CRTC does not exist");
+ else if (output->supported == LIBGAMMA_NO)
+ return send_error("selected CRTC does not support gamma adjustments");
+
+ for (start = 0; start < output->table_size; start++)
+ if (output->table_filters[start].priority <= high)
+ break;
+
+ for (end = output->table_size; end > 0; end--)
+ if (output->table_filters[end - 1].priority >= low)
+ break;
+
+ switch (output->depth)
+ {
+ case -2: strcpy(depth, "d"); break;
+ case -1: strcpy(depth, "f"); break;
+ default:
+ sprintf(depth, "%i", output->depth);
+ break;
+ }
+
+ if (coal)
+ {
+ *tables = '\0';
+ n = output->ramps_size;
+ }
+ else
+ {
+ sprintf(tables, "Tables: %zu\n", end - start);
+ n = (sizeof(int64_t) + output->ramps_size) * (end - start);
+ for (i = start; i < end; i++)
+ n += strlen(output->table_filters[i].class) + 1;
+ }
+
+ MAKE_MESSAGE(&buf, &n, 0,
+ "In response to: %s\n"
+ "Depth: %s\n"
+ "Red size: %zu\n"
+ "Green size: %zu\n"
+ "Blue size: %zu\n"
+ "%s"
+ "Length: %zu\n"
+ "\n",
+ message_id, depth, output->red_size, output->green_size,
+ output->blue_size, tables, n);
+
+ if (coal)
+ {
+ if (start == 0)
+ memcpy(buf + n, output->table_sums[end].u8.red, output->ramps_size);
+ else
+ {
+ union gamma_ramps ramps;
+ if (make_plain_ramps(&ramps, output))
+ {
+ int saved_errno = errno;
+ free(buf);
+ errno = saved_errno;
+ return -1;
+ }
+ for (i = start; i < end; i++)
+ apply_filter(&ramps, output->table_filters[i].ramps, output->depth, &ramps);
+ memcpy(buf + n, ramps.u8.red, output->ramps_size);
+ libgamma_gamma_ramps8_destroy(&(ramps.u8));
+ }
+ n += output->ramps_size;
+ }
+ else
+ for (i = start; i < end; i++)
+ {
+#if defined(__clang__)
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wcast-align"
+#endif
+ *(int64_t*)(buf + n) = output->table_filters[i].priority;
+#if defined(__clang__)
+# pragma GCC diagnostic pop
+#endif
+ n += sizeof(int64_t);
+ len = strlen(output->table_filters[i].class) + 1;
+ memcpy(buf + n, output->table_filters[i].class, len);
+ n += len;
+ memcpy(buf + n, output->table_filters[i].ramps, output->ramps_size);
+ n += output->ramps_size;
+ }
+
+ return send_message(conn, buf, n);
+}
+
+
+/**
+ * Handle a ‘Command: set-gamma’ message
+ *
+ * @param conn The index of the connection
+ * @param message_id The value of the ‘Message ID’ header
+ * @param crtc The value of the ‘CRTC’ header
+ * @param priority The value of the ‘Priority’ header
+ * @param class The value of the ‘Class’ header
+ * @param lifespan The value of the ‘Lifespan’ header
+ * @return Zero on success (even if ignored), -1 on error,
+ * 1 if connection closed
+ */
+int handle_set_gamma(size_t conn, const char* restrict message_id, const char* restrict crtc,
+ const char* restrict priority, const char* restrict class, const char* restrict lifespan)
+{
+ struct message* restrict msg = inbound + conn;
+ struct output* restrict output = NULL;
+ struct filter filter;
+ char* restrict p;
+ char* restrict q;
+ int saved_errno;
+ ssize_t r;
+
+ if (crtc == NULL) return send_error("protocol error: 'CRTC' header omitted");
+ if (class == NULL) return send_error("protocol error: 'Class' header omitted");
+ if (lifespan == NULL) return send_error("protocol error: 'Lifespan' header omitted");
+
+ filter.client = connections[conn];
+ filter.priority = priority == NULL ? 0 : (int64_t)atoll(priority);
+ filter.ramps = NULL;
+
+ output = output_find_by_name(crtc, outputs, outputs_n);
+ if (output == NULL)
+ return send_error("CRTC does not exists");
+
+ p = strstr(class, "::");
+ if ((p == NULL) || (p == class))
+ return send_error("protocol error: malformatted value for 'Class' header");
+ q = strstr(p + 2, "::");
+ if ((q == NULL) || (q == p))
+ return send_error("protocol error: malformatted value for 'Class' header");
+
+ if (!strcmp(lifespan, "until-removal"))
+ filter.lifespan = LIFESPAN_UNTIL_REMOVAL;
+ else if (!strcmp(lifespan, "until-death"))
+ filter.lifespan = LIFESPAN_UNTIL_DEATH;
+ else if (!strcmp(lifespan, "remove"))
+ filter.lifespan = LIFESPAN_REMOVE;
+ else
+ return send_error("protocol error: recognised value for 'Lifespan' header");
+
+ if (filter.lifespan == LIFESPAN_REMOVE)
+ {
+ if (msg->payload_size)
+ fprintf(stderr, "%s: ignoring superfluous payload on Command: set-gamma message with "
+ "Lifespan: remove\n", argv0);
+ if (priority != NULL)
+ fprintf(stderr, "%s: ignoring superfluous Priority header on Command: set-gamma message with "
+ "Lifespan: remove\n", argv0);
+ }
+ else if (msg->payload_size != output->ramps_size)
+ return send_error("invalid payload: size of message payload does matched the expectancy");
+ else if (priority == NULL)
+ return send_error("protocol error: 'Priority' header omitted");
+
+ filter.class = memdup(class, strlen(class) + 1);
+ if (filter.class == NULL)
+ goto fail;
+
+ if (filter.lifespan != LIFESPAN_REMOVE)
+ {
+ filter.ramps = memdup(msg->payload, msg->payload_size);
+ if (filter.ramps == NULL)
+ goto fail;
+ }
+
+ if ((r = add_filter(output, &filter)) < 0)
+ goto fail;
+ filter.class = NULL;
+ filter.ramps = NULL;
+ if (flush_filters(output, (size_t)r))
+ goto fail;
+
+ return send_errno(0);
+
+ fail:
+ saved_errno = errno;
+ send_errno(saved_errno);
+ free(filter.class);
+ free(filter.ramps);
+ errno = saved_errno;
+ return -1;
+}
+
+
+
+/**
+ * Recalculate the resulting gamma and
+ * update push the new gamma ramps to the CRTC
+ *
+ * @param output The output
+ * @param first_updated The index of the first added or removed filter
+ * @return Zero on success, -1 on error
+ */
+int flush_filters(struct output* restrict output, size_t first_updated)
+{
+ union gamma_ramps plain;
+ union gamma_ramps* last;
+ size_t i;
+
+ if (first_updated == 0)
+ {
+ if (make_plain_ramps(&plain, output) < 0)
+ return -1;
+ last = &plain;
+ }
+ else
+ last = output->table_sums + (first_updated - 1);
+
+ for (i = first_updated; i < output->table_size; i++)
+ {
+ apply_filter(output->table_sums + i, output->table_filters[i].ramps, output->depth, last);
+ last = output->table_sums + i;
+ }
+
+ set_gamma(output, last);
+
+ if (first_updated == 0)
+ libgamma_gamma_ramps8_destroy(&(plain.u8));
+
+ return 0;
+}
+
diff --git a/src/coopgamma-server/server.h b/src/coopgamma-server/server.h
new file mode 100644
index 0000000..971f7df
--- /dev/null
+++ b/src/coopgamma-server/server.h
@@ -0,0 +1,93 @@
+/**
+ * coopgammad -- Cooperative gamma server
+ * 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/>.
+ */
+#ifndef COOPGAMMA_SERVER_SERVER_H
+#define COOPGAMMA_SERVER_SERVER_H
+
+
+#include "../types/output.h"
+
+#include <stddef.h>
+
+
+
+#ifndef GCC_ONLY
+# if defined(__GNUC__) && !defined(__clang__)
+# define GCC_ONLY(...) __VA_ARGS__
+# else
+# define GCC_ONLY(...) /* nothing */
+# endif
+#endif
+
+
+
+/**
+ * Handle a closed connection
+ *
+ * @param client The file descriptor for the client
+ * @return Zero on success, -1 on error
+ */
+int connection_closed(int client);
+
+/**
+ * Handle a ‘Command: get-gamma’ message
+ *
+ * @param conn The index of the connection
+ * @param message_id The value of the ‘Message ID’ header
+ * @param crtc The value of the ‘CRTC’ header
+ * @param coalesce The value of the ‘Coalesce’ header
+ * @param high_priority The value of the ‘High priority’ header
+ * @param low_priority The value of the ‘Low priority’ header
+ * @return Zero on success (even if ignored), -1 on error,
+ * 1 if connection closed
+ */
+GCC_ONLY(__attribute__((nonnull(2))))
+int handle_get_gamma(size_t conn, const char* restrict message_id, const char* restrict crtc,
+ const char* restrict coalesce, const char* restrict high_priority,
+ const char* restrict low_priority);
+
+/**
+ * Handle a ‘Command: set-gamma’ message
+ *
+ * @param conn The index of the connection
+ * @param message_id The value of the ‘Message ID’ header
+ * @param crtc The value of the ‘CRTC’ header
+ * @param priority The value of the ‘Priority’ header
+ * @param class The value of the ‘Class’ header
+ * @param lifespan The value of the ‘Lifespan’ header
+ * @return Zero on success (even if ignored), -1 on error,
+ * 1 if connection closed
+ */
+GCC_ONLY(__attribute__((nonnull(2))))
+int handle_set_gamma(size_t conn, const char* restrict message_id, const char* restrict crtc,
+ const char* restrict priority, const char* restrict class, const char* restrict lifespan);
+
+
+/**
+ * Recalculate the resulting gamma and
+ * update push the new gamma ramps to the CRTC
+ *
+ * @param output The output
+ * @param first_updated The index of the first added or removed filter
+ * @return Zero on success, -1 on error
+ */
+GCC_ONLY(__attribute__((nonnull)))
+int flush_filters(struct output* restrict output, size_t first_updated);
+
+
+#endif
+
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