Restructure

Signed-off-by: Mattias Andrée <maandree@kth.se>

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
+