Rewrite everything

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

1 files changed, 254 insertions, 0 deletions

diff --git a/cg-base.h b/cg-base.h
new file mode 100644
index 0000000..cd885e7
--- /dev/null
+++ b/cg-base.h
@@ -0,0 +1,254 @@
+/**
+ * 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/>.
+ */
+#include <libcoopgamma.h>
+
+#include <inttypes.h>
+
+
+
+/**
+ * Value of `default_priority` that indicates
+ * that there is no default priority
+ */
+#define NO_DEFAULT_PRIORITY  INT64_MAX
+
+
+
+/**
+ * X-macro that list all gamma ramp types
+ * 
+ * X will be expanded with 4 arguments:
+ * 1)  The libcoopgamma constant that identifies the type
+ * 2)  The member in `union libcoopgamma_ramps` that
+ *     corresponds to the type
+ * 3)  The max value for the ramp stops
+ * 4)  The type of the ramp stops
+ */
+#define LIST_DEPTHS\
+  X(LIBCOOPGAMMA_UINT8,  u8,  UINT8_MAX,   uint8_t)\
+  X(LIBCOOPGAMMA_UINT16, u16, UINT16_MAX,  uint16_t)\
+  X(LIBCOOPGAMMA_UINT32, u32, UINT32_MAX,  uint32_t)\
+  X(LIBCOOPGAMMA_UINT64, u64, UINT64_MAX,  uint64_t)\
+  X(LIBCOOPGAMMA_FLOAT,  f,   ((float)1),  float)\
+  X(LIBCOOPGAMMA_DOUBLE, d,   ((double)1), double)
+
+
+
+/**
+ * Information (except asynchronous call context)
+ * required to update the gamma ramps on a CRTC.
+ */
+typedef struct filter_update
+{
+  /**
+   * The filter to update
+   * 
+   * `.filter.crtc`, `.filter.class`, and
+   * `.filter.priority` (unless `default_priority`
+   * is `NO_DEFAULT_PRIORITY`), `.filter.depth`
+   * are preconfigured, and `.filter.ramps`
+   * is preinitialised and preset to an
+   * identity ramp
+   */
+  libcoopgamma_filter_t filter;
+  
+  /**
+   * The index of the CRTC
+   */
+  size_t crtc;
+  
+  /**
+   * Has the update been synchronised?
+   */
+  int synced;
+  
+  /**
+   * Did the update fail?
+   */
+  int failed;
+  
+  /**
+   * Error description if `.failed` is true
+   */
+  libcoopgamma_error_t error;
+  
+  /**
+   * If zero, the ramps in `.filter` shall
+   * neither be modified nor freed
+   */
+  int master;
+  
+  /**
+   * 0-terminated list of elements in
+   * `.crtc_updates` which shares gamma
+   * ramps with this instance
+   * 
+   * This will only be set if `.master`
+   * is true
+   */
+  size_t* slaves;
+  
+} filter_update_t;
+
+
+
+/**
+ * The process's name
+ */
+extern const char* argv0;
+
+/**
+ * The libcoopgamma context
+ */
+extern libcoopgamma_context_t cg;
+
+/**
+ * The names of the selected CRTC:s
+ */
+extern char** crtcs;
+
+/**
+ * Gamma ramp updates for each CRTC
+ */
+extern filter_update_t* crtc_updates;
+
+/**
+ * CRTC and monitor information about
+ * each selected CRTC and connect monitor
+ */
+extern libcoopgamma_crtc_info_t* crtc_info;
+
+/**
+ * The number of selected CRTC:s
+ */
+extern size_t crtcs_n;
+
+/**
+ * The number of filters
+ */
+extern size_t filters_n;
+
+
+
+/**
+ * The default filter priority for the program
+ */
+extern const int64_t default_priority;
+
+/**
+ * The default class for the program
+ */
+extern char default_class[];
+
+/**
+ * Class suffixes
+ */
+extern const char* const* class_suffixes;
+
+
+
+/**
+ * Make elements in `crtc_updates` slaves where appropriate
+ * 
+ * @return  Zero on success, -1 on error
+ */
+int make_slaves(void);
+
+/**
+ * Update a filter and synchronise calls
+ * 
+ * @param   index    The index of the CRTC
+ * @param   timeout  The number of milliseconds a call to `poll` may block,
+ *                   -1 if it may block forever
+ * @return           1: Success, no pending synchronisations
+ *                   0: Success, with still pending synchronisations
+ *                   -1: Error, `errno` set
+ *                   -2: Error, `cg.error` set
+ * 
+ * @throws  EINTR   Call to `poll` was interrupted by a signal
+ * @throws  EAGAIN  Call to `poll` timed out
+ */
+int update_filter(size_t index, int timeout);
+
+/**
+ * Synchronised calls
+ * 
+ * @param   timeout  The number of milliseconds a call to `poll` may block,
+ *                   -1 if it may block forever
+ * @return           1: Success, no pending synchronisations
+ *                   0: Success, with still pending synchronisations
+ *                   -1: Error, `errno` set
+ *                   -2: Error, `cg.error` set
+ * 
+ * @throws  EINTR   Call to `poll` was interrupted by a signal
+ * @throws  EAGAIN  Call to `poll` timed out
+ */
+int synchronise(int timeout);
+
+
+/**
+ * Print usage information and exit
+ */
+#if defined(__GNUC__)
+__attribute__((__noreturn__))
+#endif
+extern void usage(void);
+
+/**
+ * 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
+ */
+#if defined(__GNUC__)
+__attribute__((__nonnull__(1)))
+#endif
+extern int handle_opt(char* opt, char* arg);
+
+/**
+ * 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   prio  The argument associated with the "-p" option
+ * @return        Zero on success, -1 on error
+ */
+#if defined(__GNUC__)
+__attribute__((__nonnull__(2)))
+#endif
+extern int handle_args(int argc, char* argv[], char* prio);
+
+/**
+ * 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
+ */
+extern int start(void);
+