add api .h files

Signed-off-by: Mattias Andrée <maandree@operamail.com>

4 files changed, 1092 insertions, 0 deletions

diff --git a/src/libgamma-error.h b/src/libgamma-error.h
new file mode 100644
index 0000000..bd17097
--- /dev/null
+++ b/src/libgamma-error.h
@@ -0,0 +1,26 @@
+/**
+ * libgamma — Display server abstraction layer for gamma ramp adjustments
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This library 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 library 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 library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef LIBGAMMA_ERROR_H
+#define LIBGAMMA_ERROR_H
+
+
+/* TODO: Fill with error values (they should be negative.) */
+
+
+#endif
+
diff --git a/src/libgamma-facade.h b/src/libgamma-facade.h
new file mode 100644
index 0000000..77b0a3a
--- /dev/null
+++ b/src/libgamma-facade.h
@@ -0,0 +1,305 @@
+/**
+ * libgamma — Display server abstraction layer for gamma ramp adjustments
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This library 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 library 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 library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef LIBGAMMA_FACADE_H
+#define LIBGAMMA_FACADE_H
+
+
+#include "libgamma-method.h"
+
+#include <stddef.h>
+#include <stdint.h>
+
+
+/**
+ * Return the capabilities of an adjustment method
+ * 
+ * @param  this    The data structure to fill with the method's capabilities
+ * @param  method  The adjustment method (display server and protocol)
+ */
+void libgamma_method_capabilities(libgamma_method_capabilities_t* this, int method);
+
+/**
+ * Return the capabilities of an adjustment method
+ * 
+ * @param   method  The adjustment method (display server and protocol)
+ * @return          The default site, `NULL` if it cannot be determined or
+ *                  if multiple sites are not supported by the adjustment
+ *                  method. This value should not be free:d.
+ */
+char* libgamma_method_default_site(int method);
+
+/**
+ * Return the capabilities of an adjustment method
+ * 
+ * @param   method  The adjustment method (display server and protocol)
+ * @return          The environ variables that is used to determine the
+ *                  default site. `NULL` if there is none, that is, if
+ *                  the method does not support multiple sites.
+ *                  This value should not be free:d.
+ */
+const char* libgamma_method_default_site_variable(int method);
+
+
+/**
+ * Initialise an allocated site state
+ * 
+ * @param   this    The site state to initialise
+ * @param   method  The adjustment method (display server and protocol)
+ * @param   site    The site identifier, unless it is `NULL` it must a
+ *                  `free`:able. One the state is destroyed the library
+ *                  will attempt to free it. There you should not free
+ *                  it yourself, and it must not be a string constant
+ *                  or allocate on the stack.
+ * @return          Zero on success, otherwise (negative) the value of an
+ *                  error identifier provided by this library
+ */
+int libgamma_site_initialise(libgamma_site_state_t* this,
+			     int method, char* site);
+
+/**
+ * Release all resources held by a site state
+ * 
+ * @param  this  The site state
+ */
+void libgamma_site_destroy(libgamma_site_state_t* this);
+
+/**
+ * Release all resources held by a site state
+ * and free the site state pointer
+ * 
+ * @param  this  The site state
+ */
+void libgamma_site_free(libgamma_site_state_t* this);
+
+/**
+ * Restore the gamma ramps all CRTCS with a site to the system settings
+ * 
+ * @param   this  The site state
+ * @return        Zero on success, otherwise (negative) the value of an
+ *                error identifier provided by this library
+ */
+int libgamma_site_restore(libgamma_site_state_t* this);
+
+
+/**
+ * Initialise an allocated partition state
+ * 
+ * @param   this       The partition state to initialise
+ * @param   site       The site state for the site that the partition belongs to
+ * @param   partition  The the index of the partition within the site
+ * @return             Zero on success, otherwise (negative) the value of an
+ *                     error identifier provided by this library
+ */
+int libgamma_partition_initialise(libgamma_partition_state_t* this,
+				  libgamma_site_state_t* site, size_t partition);
+
+/**
+ * Release all resources held by a partition state
+ * 
+ * @param  this  The partition state
+ */
+void libgamma_partition_destroy(libgamma_partition_state_t* this);
+
+/**
+ * Release all resources held by a partition state
+ * and free the partition state pointer
+ * 
+ * @param  this  The partition state
+ */
+void libgamma_partition_free(libgamma_partition_state_t* this);
+
+/**
+ * Restore the gamma ramps all CRTCS with a partition to the system settings
+ * 
+ * @param   this  The partition state
+ * @return        Zero on success, otherwise (negative) the value of an
+ *                error identifier provided by this library
+ */
+int libgamma_partition_restore(libgamma_site_state_t* this);
+
+
+/**
+ * Initialise an allocated CRTC state
+ * 
+ * @param   this       The CRTC state to initialise
+ * @param   partition  The partition state for the partition that the CRTC belongs to
+ * @param   crtc       The the index of the CRTC within the site
+ * @return             Zero on success, otherwise (negative) the value of an
+ *                     error identifier provided by this library
+ */
+int libgamma_crtc_initialise(libgamma_crtc_state_t* this,
+			     libgamma_partition_state_t* partition, size_t crtc);
+
+/**
+ * Release all resources held by a CRTC state
+ * 
+ * @param  this  The CRTC state
+ */
+void libgamma_crtc_destroy(libgamma_crtc_state_t* this);
+
+/**
+ * Release all resources held by a CRTC state
+ * and free the CRTC state pointer
+ * 
+ * @param  this  The CRTC state
+ */
+void libgamma_crtc_free(libgamma_crtc_state_t* this);
+
+/**
+ * Restore the gamma ramps for a CRTC to the system settings for that CRTC
+ * 
+ * @param   this  The CRTC state
+ * @return        Zero on success, otherwise (negative) the value of an
+ *                error identifier provided by this library
+ */
+int libgamma_crtc_restore(libgamma_site_state_t* this);
+
+
+/**
+ * Read information about a CRTC
+ * 
+ * @param   this   Instance of a data structure to fill with the information about the CRTC
+ * @param   crtc   The state of the CRTC whose information should be read
+ * @param   field  OR:ed identifiers for the information about the CRTC that should be read
+ * @return         Zero on success, -1 on error. On error refer to the error reports in `this`.
+ */
+int libgamma_get_crtc_information(libgamma_crtc_information_t* this,
+				  libgamma_crtc_state_t* crtc, int32_t field);
+
+/**
+ * Release all resources in an information data structure for a CRTC
+ * 
+ * @param  this  The CRTC information
+ */
+int libgamma_crtc_information_destroy(libgamma_crtc_information_t* this);
+
+/**
+ * Release all resources in an information data structure for a CRTC
+ * and free the data structure pointer
+ * 
+ * @param  this  The CRTC information
+ */
+int libgamma_crtc_information_free(libgamma_crtc_information_t* this);
+
+/**
+ * Convert a raw representation of an EDID to a lowercase hexadecimal representation
+ * 
+ * @param   edid:const unsigned char*  The EDID in raw representation
+ * @param   length:size_t              The length of `edid`
+ * @return  :char*                     The EDID in lowercase hexadecimal representation,
+ *                                     `NULL` on allocation error, `errno` will be set accordingly
+ */
+#define libgamma_behex_edid(edid, length)  \
+  libgamma_behex_edid_lowercase(edid, length)
+
+/**
+ * Convert a raw representation of an EDID to a lowercase hexadecimal representation
+ * 
+ * @param   edid    The EDID in raw representation
+ * @param   length  The length of `edid`
+ * @retrun          The EDID in lowercase hexadecimal representation,
+ *                  `NULL` on allocation error, `errno` will be set accordingly
+ */
+char* libgamma_behex_edid_lowercase(const unsigned char* edid, size_t length);
+
+/**
+ * Convert a raw representation of an EDID to an uppercase hexadecimal representation
+ * 
+ * @param   edid    The EDID in raw representation
+ * @param   length  The length of `edid`
+ * @retrun          The EDID in uppercase hexadecimal representation,
+ *                  NULL` on allocation error, `errno` will be set accordingly
+ */
+char* libgamma_behex_edid_uppercase(const unsigned char* edid, size_t length);
+
+/**
+ * Convert an hexadecimal representation of an EDID to a raw representation
+ * 
+ * @param   edid  The EDID in hexadecimal representation
+ * @retrun        The EDID in raw representation, it will be twice the length
+ *                of `edid` (the input value). `NULL` on allocation error,
+ *                `errno` will be set accordingly.
+ */
+unsigned char* libgamma_unhex_edid(const char* edid);
+
+
+/**
+ * Set the gamma ramps for a CRTC, 16-bit gamma-depth version
+ * 
+ * @param   this   The CRTC state
+ * @parma   ramps  The gamma ramps to apply
+ * @return         Zero on success, otherwise (negative) the value of an
+ *                 error identifier provided by this library
+ */
+int libgamma_crtc_set_gamma_ramps(libgamma_crtc_state_t* this, libgamma_gamma_ramps_t ramps);
+
+/**
+ * Get current the gamma ramps for a CRTC, 16-bit gamma-depth version
+ * 
+ * @param   this   The CRTC state
+ * @parma   ramps  The gamma ramps to fill with the current values
+ * @return         Zero on success, otherwise (negative) the value of an
+ *                 error identifier provided by this library
+ */
+int libgamma_crtc_get_gamma_ramps(libgamma_crtc_state_t* this, libgamma_gamma_ramps_t* ramps);
+
+
+/**
+ * Set the gamma ramps for a CRTC, 32-bit gamma-depth version
+ * 
+ * @param   this   The CRTC state
+ * @parma   ramps  The gamma ramps to apply
+ * @return         Zero on success, otherwise (negative) the value of an
+ *                 error identifier provided by this library
+ */
+int libgamma_crtc_set_gamma_ramps32(libgamma_crtc_state_t* this, libgamma_gamma_ramps32_t ramps);
+
+/**
+ * Get current the gamma ramps for a CRTC, 32-bit gamma-depth version
+ * 
+ * @param   this   The CRTC state
+ * @parma   ramps  The gamma ramps to fill with the current values
+ * @return         Zero on success, otherwise (negative) the value of an
+ *                 error identifier provided by this library
+ */
+int libgamma_crtc_get_gamma_ramps32(libgamma_crtc_state_t* this, libgamma_gamma_ramps32_t* ramps);
+
+
+/**
+ * Set the gamma ramps for a CRTC, 64-bit gamma-depth version
+ * 
+ * @param   this   The CRTC state
+ * @parma   ramps  The gamma ramps to apply
+ * @return         Zero on success, otherwise (negative) the value of an
+ *                 error identifier provided by this library
+ */
+int libgamma_crtc_set_gamma_ramps64(libgamma_crtc_state_t* this, libgamma_gamma_ramps64_t ramps);
+
+/**
+ * Get current the gamma ramps for a CRTC, 64-bit gamma-depth version
+ * 
+ * @param   this   The CRTC state
+ * @parma   ramps  The gamma ramps to fill with the current values
+ * @return         Zero on success, otherwise (negative) the value of an
+ *                 error identifier provided by this library
+ */
+int libgamma_crtc_get_gamma_ramps64(libgamma_crtc_state_t* this, libgamma_gamma_ramps64_t* ramps);
+
+
+#endif
+
diff --git a/src/libgamma-method.h b/src/libgamma-method.h
new file mode 100644
index 0000000..256b1f0
--- /dev/null
+++ b/src/libgamma-method.h
@@ -0,0 +1,733 @@
+/**
+ * libgamma — Display server abstraction layer for gamma ramp adjustments
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This library 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 library 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 library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef LIBGAMMA_METHOD_H
+#define LIBGAMMA_METHOD_H
+
+
+#include <stddef.h>
+#include <stdint.h>
+
+
+
+/**
+ * The identifier for the dummy adjustment method.
+ * This method can be configured and is useful for
+ * testing your program's ability to handle errors.
+ */
+#ifdef HAVE_GAMMA_METHOD_DUMMY
+# define GAMMA_METHOD_DUMMY  0
+#endif
+
+/**
+ * The identifier for the adjustment method with
+ * uses the RandR protocol under the X display server.
+ */
+#ifdef HAVE_GAMMA_METHOD_X_RANDR
+# define GAMMA_METHOD_X_RANDR  1
+#endif
+
+/**
+ * The identifier for the adjustment method with
+ * uses the VidMode protocol under the X display server.
+ * This is an older alternative to RandR that can
+ * [not verified] work on some drivers that are not
+ * supported by RandR, however it can only control the
+ * primary CRTC per screen (partition).
+ */
+#ifdef HAVE_GAMMA_METHOD_X_VIDMODE
+# define GAMMA_METHOD_X_VIDMODE  2
+#endif
+
+/**
+ * The identifier for the Direct Rendering Manager
+ * adjustment method that is available in Linux
+ * (built in to the Linux kernel with a userland
+ * library for access) and is a part of the
+ * Direct Rendering Infrastructure. This adjustment
+ * method all work when you are in non-graphical
+ * mode; however a display server cannnot be
+ * started while this is running, but it can be
+ * started while a display server is running.
+ */
+#ifdef HAVE_GAMMA_METHOD_LINUX_DRM
+# define GAMMA_METHOD_LINUX_DRM  3
+#endif
+
+/**
+ * The identifier for the Graphics Device Interface
+ * adjustment method that is available in Windows.
+ * This method is not well tested; it can be compiled
+ * to be available under X.org using a translation layer.
+ */
+#ifdef HAVE_GAMMA_METHOD_W32_GDI
+# define GAMMA_METHOD_W32_GDI  4
+#endif
+
+/**
+ * The identifier for the Core Graphics adjustment
+ * method that is available in Mac OS X that can
+ * adjust gamma ramps under the Quartz display server.
+ * This method is not well tested; it can be compiled
+ * to be available under X.org using a translation layer.
+ */
+#ifdef HAVE_GAMMA_METHOD_QUARTZ_CORE_GRAPHICS
+# define GAMMA_METHOD_QUARTZ_CORE_GRAPHICS  5
+#endif
+
+
+/**
+ * The index of the last gamma method, neither it
+ * nor any index before it may actually be supported
+ * as it could have been disabled at compile-time
+ */
+#define GAMMA_METHOD_MAX  5
+
+
+
+/**
+ * Capabilities of adjustment methods
+ */
+typedef struct libgamma_method_capabilities {
+  
+  /**
+   * OR of the CRTC information fields in `libgamma_crtc_information_t`
+   * that may (but can fail) be read successfully
+   */
+  int32_t crtc_information;
+  
+  /**
+   * Whether the default site is known, if true the site is integrated
+   * to the system or can be determined using environment variables
+   */
+  int default_site_known : 1;
+  
+  /**
+   * Whether the adjustment method supports multiple sites rather
+   * than just the default site
+   */
+  int multiple_sites : 1;
+  
+  /**
+   * Whether the adjustment method supports multiple partitions
+   * per site
+   */
+  int multiple_partitions : 1;
+  
+  /**
+   * Whether the adjustment method supports multiple CRTC:s
+   * per partition per site
+   */
+  int multiple_crtcs : 1;
+  
+  /**
+   * Whether the adjustment method supports `libgamma_site_restore`
+   */
+  int site_restore : 1;
+  
+  /**
+   * Whether the adjustment method supports `libgamma_partition_restore`
+   */
+  int partition_restore : 1;
+  
+  /**
+   * Whether the adjustment method supports `libgamma_crtc_restore`
+   */
+  int crtc_restore : 1;
+  
+  /**
+   * Whether the `gamma_size` field in `libgamma_crtc_information_t`
+   * will always be filled with the same value for the adjustment method
+   */
+  int fixed_gamma_size : 1;
+  
+  /**
+   * Whether the `gamma_depth` field in `libgamma_crtc_information_t`
+   * will always be filled with the same value for the adjustment method
+   */
+  int fixed_gamma_depth : 1;
+  
+  /**
+   * Whether the adjustment method will actually perform adjustments
+   */
+  int real : 1;
+  
+  /**
+   * Whether the adjustment method is implement using a translation layer
+   */
+  int fake : 1;
+  
+} libgamma_method_capabilities_t;
+
+
+/**
+ * Site state
+ * 
+ * On operating systems that integrate a graphical environment
+ * there is usally just one site. However, one systems with
+ * pluggable graphics, like Unix-like systems such as GNU/Linux
+ * and the BSD:s, there can usually be any (feasible) number of
+ * sites. In X.org parlance they are called displays.
+ */
+typedef struct libgamma_site_state {
+  
+  /**
+   * Adjustment method implementation specific data.
+   * You as a user of this library should not touch this.
+   */
+  void* data;
+  
+  /**
+   * This field specifies, for the methods if this library,
+   * which adjustment method (display server and protocol)
+   * is used to adjust the gamma ramps.
+   */
+  int method;
+  
+  /**
+   * The site identifier. It can either be `NULL` or a string.
+   * `NULL` indicates the default site. On systems like the
+   * Unix-like systems, where the graphics are pluggable, this
+   * is usally resolved by an environment variable, such as
+   * "DISPLAY" for X.org.
+   */
+  char* site;
+  
+  /**
+   * The number of partitions that is available on this site.
+   * Probably the majority of display server only one partition
+   * per site. However, X.org can, and traditional used to have
+   * on multi-headed environments, multiple partitions per site.
+   * In X.org partitions are called 'screens'. It is not to be
+   * confused with monitor. A screen is a collection of monitors,
+   * and the mapping from monitors to screens is a surjection.
+   * On hardware-level adjustment methods, such as Direct
+   * Rendering Manager, a partition is a graphics card.
+   */
+  size_t partitions_available;
+  
+} libgamma_site_state_t;
+
+
+/**
+ * Partition state
+ * 
+ * Probably the majority of display server only one partition
+ * per site. However, X.org can, and traditional used to have
+ * on multi-headed environments, multiple partitions per site.
+ * In X.org partitions are called 'screens'. It is not to be
+ * confused with monitor. A screen is a collection of monitors,
+ * and the mapping from monitors to screens is a surjection.
+ * On hardware-level adjustment methods, such as Direct
+ * Rendering Manager, a partition is a graphics card.
+ */
+typedef struct libgamma_partition_state {
+  
+  /**
+   * Adjustment method implementation specific data.
+   * You as a user of this library should not touch this.
+   */
+  void* data;
+  
+  /**
+   * The site this partition belongs to
+   */
+  libgamma_site_state_t* site;
+  
+  /**
+   * The index of the partition
+   */
+  size_t partition;
+  
+  /**
+   * The number of CRTC:s that are available under this
+   * partition. Note that the CRTC:s are not necessarily
+   * online.
+   */
+  size_t crtcs_available;
+  
+} libgamma_partition_state_t;
+
+
+/**
+ * Cathode ray tube controller state
+ * 
+ * The CRTC controls the gamma ramps for the
+ * monitor that is plugged in to the connector
+ * that the CRTC belongs to
+ */
+typedef struct libgamma_crtc_state {
+  
+  /**
+   * Adjustment method implementation specific data.
+   * You as a user of this library should not touch this.
+   */
+  void* data;
+  
+  /**
+   * The partition this CRTC belongs to
+   */
+  libgamma_partition_state_t* site;
+  
+  /**
+   * The index of the CRTC within its partition.
+   */
+  size_t crtc;
+  
+} libgamma_crtc_state_t;
+
+
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * values for `edid` and `edid_length` and report errors to `edid_error`
+ */
+#define CRTC_INFO_EDID  (1 << 0)
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * value for `width_mm` and report errors to `width_mm_error`
+ */
+#define CRTC_INFO_WIDTH_MM  (1 << 1)
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * value for `height_mm` and report errors to `height_mm_error`
+ */
+#define CRTC_INFO_HEIGHT_MM  (1 << 2)
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * value for `width_mm_edid` and report errors to `width_mm_edid_error`
+ */
+#define CRTC_INFO_WIDTH_MM_EDID  (1 << 3)
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * value for `height_mm_edid` and report errors to `height_mm_edid_error`
+ */
+#define CRTC_INFO_HEIGHT_MM_EDID  (1 << 4)
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * value for `gamma_size` and report errors to `gamma_size_error`
+ */
+#define CRTC_INFO_GAMMA_SIZE  (1 << 5)
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * value for `gamma_depth` and report errors to `gamma_depth_error`
+ */
+#define CRTC_INFO_GAMMA_DEPTH  (1 << 6)
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * value for `gamma_support` and report errors to `gamma_support_error`
+ */
+#define CRTC_INFO_GAMMA_SUPPORT  (1 << 7)
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * value for `subpixel_order` and report errors to `subpixel_order_error`
+ */
+#define CRTC_INFO_SUBPIXEL_ORDER  (1 << 8)
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * value for `active` and report errors to `active_error`
+ */
+#define CRTC_INFO_ACTIVE  (1 << 9)
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * value for `connector_name` and report errors to `connector_name_error`
+ */
+#define CRTC_INFO_CONNECTOR_NAME  (1 << 10)
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * value for `connector_type` and report errors to `connector_type_error`
+ */
+#define CRTC_INFO_CONNECTOR_TYPE  (1 << 11)
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * values for `gamma_red`, `gamma_green` and `gamma_blue`
+ * and report errors to `connector_type_error`
+ */
+#define CRTC_INFO_GAMMA  (1 << 12)
+
+
+/**
+ * Cathode ray tube controller information data structure
+ */
+typedef struct libgamma_crtc_information {
+  
+  /**
+   * The Extended Display Identification Data associated with
+   * the attached monitor. This is raw byte array that is usually
+   * 128 bytes long. It is not NUL-terminate, rather its length
+   * is stored in `edid_size`.
+   */
+  unsigned char* edid;
+  
+  /**
+   * The length of `edid`
+   */
+  size_t edid_length;
+  
+  /**
+   * Zero on success, positive it holds the value `errno` had
+   * when the reading failed, otherwise (negative) the value
+   * of an error identifier provided by this library
+   */
+  int edid_error;
+  
+  
+  /**
+   * The phyical width, in millimetres, of the viewport of the
+   * attached monitor, as reported by the adjustment method. This
+   * value may be incorrect, which is a known issue with the X
+   * server where it is the result of the X server attempting
+   * the estimate the size on its own.
+   * Zero means that its is not applicable, which is the case
+   * for projectors.
+   */
+  size_t width_mm;
+  
+  /**
+   * Zero on success, positive it holds the value `errno` had
+   * when the reading failed, otherwise (negative) the value
+   * of an error identifier provided by this library
+   */
+  int width_mm_error;
+  
+  
+  /**
+   * The phyical height, in millimetres, of the viewport of the
+   * attached monitor, as reported by the adjustment method. This
+   * value may be incorrect, which is a known issue with the X
+   * server where it is the result of the X server attempting
+   * the estimate the size on its own.
+   * Zero means that its is not applicable, which is the case
+   * for projectors.
+   */
+  size_t height_mm;
+  
+  /**
+   * Zero on success, positive it holds the value `errno` had
+   * when the reading failed, otherwise (negative) the value
+   * of an error identifier provided by this library
+   */
+  int height_mm_error;
+  
+  
+  /**
+   * The phyical width, in millimetres, of the viewport of the
+   * attached monitor, as reported by it the monitor's Extended
+   * Display Information Data. This value can only contain whole
+   * centimetres, which means that the result is always zero
+   * modulus ten. However, this could change with revisions of
+   * the EDID structure.
+   * Zero means that its is not applicable, which is the case
+   * for projectors.
+   */
+  size_t width_mm_edid;
+  
+  /**
+   * Zero on success, positive it holds the value `errno` had
+   * when the reading failed, otherwise (negative) the value
+   * of an error identifier provided by this library
+   */
+  int width_mm_edid_error;
+  
+  
+  /**
+   * The phyical height, in millimetres, of the viewport of the
+   * attached monitor, as reported by it the monitor's Extended
+   * Display Information Data. This value can only contain whole
+   * centimetres, which means that the result is always zero
+   * modulus ten. However, this could change with revisions of
+   * the EDID structure.
+   * Zero means that its is not applicable, which is the case
+   * for projectors.
+   */
+  size_t height_mm_edid;
+  
+  /**
+   * Zero on success, positive it holds the value `errno` had
+   * when the reading failed, otherwise (negative) the value
+   * of an error identifier provided by this library
+   */
+  int height_mm_edid_error;
+  
+  
+  /**
+   * The size of the encoding axes of gamma ramps
+   */
+  size_t gamma_size;
+  
+  /**
+   * Zero on success, positive it holds the value `errno` had
+   * when the reading failed, otherwise (negative) the value
+   * of an error identifier provided by this library
+   */
+  int gamma_size_error;
+  
+  
+  /**
+   * The bit-depth of the value axes of gamma ramps
+   */
+  size_t gamma_depth;
+  
+  /**
+   * Zero on success, positive it holds the value `errno` had
+   * when the reading failed, otherwise (negative) the value
+   * of an error identifier provided by this library
+   */
+  int gamma_depth_error;
+  
+  
+  /**
+   * Non-zero gamma ramp adjustments are supported
+   */
+  int gamma_support;
+  
+  /**
+   * Zero on success, positive it holds the value `errno` had
+   * when the reading failed, otherwise (negative) the value
+   * of an error identifier provided by this library
+   */
+  int gamma_support_error;
+  
+  
+  /**
+   * The layout of the subpixels.
+   * You cannot count on this value, but it is provided
+   * anyway as a means of distinguishing monitors.
+   */
+  int subpixel_order;
+  
+  /**
+   * Zero on success, positive it holds the value `errno` had
+   * when the reading failed, otherwise (negative) the value
+   * of an error identifier provided by this library
+   */
+  int subpixel_order_error;
+  
+  
+  /**
+   * Whether there is a monitors connected to the CRTC
+   */
+  int active;
+  
+  /**
+   * Zero on success, positive it holds the value `errno` had
+   * when the reading failed, otherwise (negative) the value
+   * of an error identifier provided by this library
+   */
+  int active_error;
+  
+  
+  /**
+   * The name of the connector as designated by the display
+   * server or as give by this library in case the display
+   * server lacks this feature
+   */
+  char* connector_name;
+  
+  /**
+   * Zero on success, positive it holds the value `errno` had
+   * when the reading failed, otherwise (negative) the value
+   * of an error identifier provided by this library
+   */
+  int connector_name_error;
+  
+  
+  /**
+   * The type of the connector that is associated with the CRTC
+   */
+  int connector_type;
+  
+  /**
+   * Zero on success, positive it holds the value `errno` had
+   * when the reading failed, otherwise (negative) the value
+   * of an error identifier provided by this library
+   */
+  int connector_type_error;
+  
+  
+  /**
+   * The gamma characteristics of the monitor as reported
+   * in its Extended Display Information Data. The value
+   * holds the value for the red channel. If you do not have
+   * and more accurate measurement of the gamma for the
+   * monitor this could be used to give a rought gamma
+   * correction; simply divide the value with 2.2 and use
+   * the result for the red channel in the gamma correction.
+   */
+  float gamma_red;
+  
+  /**
+   * The gamma characteristics of the monitor as reported
+   * in its Extended Display Information Data. The value
+   * holds the value for the green channel. If you do not have
+   * and more accurate measurement of the gamma for the
+   * monitor this could be used to give a rought gamma
+   * correction; simply divide the value with 2.2 and use
+   * the result for the green channel in the gamma correction.
+   */
+  float gamma_green;
+  
+  /**
+   * The gamma characteristics of the monitor as reported
+   * in its Extended Display Information Data. The value
+   * holds the value for the blue channel. If you do not have
+   * and more accurate measurement of the gamma for the
+   * monitor this could be used to give a rought gamma
+   * correction; simply divide the value with 2.2 and use
+   * the result for the blue channel in the gamma correction.
+   */
+  float gamma_blue;
+  
+  /**
+   * Zero on success, positive it holds the value `errno` had
+   * when the reading failed, otherwise (negative) the value
+   * of an error identifier provided by this library
+   */
+  int gamma_error;
+  
+} libgamma_crtc_information_t;
+
+
+
+/**
+ * Gamma ramp structure for 16-bit gamma ramps
+ */
+typedef struct libgamma_gamma_ramps
+{
+  /**
+   * The size of `red`
+   */
+  size_t red_size;
+  
+  /**
+   * The size of `green`
+   */
+  size_t green_size;
+  
+  /**
+   * The size of `blue`
+   */
+  size_t blue_size;
+  
+  /**
+   * The gamma ramp for the red channel
+   */
+  uint16_t* red;
+  
+  /**
+   * The gamma ramp for the green channel
+   */
+  uint16_t* green;
+  
+  /**
+   * The gamma ramp for the blue channel
+   */
+  uint16_t* blue;
+  
+} libgamma_gamma_ramps_t;
+
+
+/**
+ * Gamma ramp structure for 32-bit gamma ramps
+ */
+typedef struct libgamma_gamma_ramps32
+{
+  /**
+   * The size of `red`
+   */
+  size_t red_size;
+  
+  /**
+   * The size of `green`
+   */
+  size_t green_size;
+  
+  /**
+   * The size of `blue`
+   */
+  size_t blue_size;
+  
+  /**
+   * The gamma ramp for the red channel
+   */
+  uint32_t* red;
+  
+  /**
+   * The gamma ramp for the green channel
+   */
+  uint32_t* green;
+  
+  /**
+   * The gamma ramp for the blue channel
+   */
+  uint32_t* blue;
+  
+} libgamma_gamma_ramps32_t;
+
+
+/**
+ * Gamma ramp structure for 64-bit gamma ramps
+ */
+typedef struct libgamma_gamma_ramps64
+{
+  /**
+   * The size of `red`
+   */
+  size_t red_size;
+  
+  /**
+   * The size of `green`
+   */
+  size_t green_size;
+  
+  /**
+   * The size of `blue`
+   */
+  size_t blue_size;
+  
+  /**
+   * The gamma ramp for the red channel
+   */
+  uint64_t* red;
+  
+  /**
+   * The gamma ramp for the green channel
+   */
+  uint64_t* green;
+  
+  /**
+   * The gamma ramp for the blue channel
+   */
+  uint64_t* blue;
+  
+} libgamma_gamma_ramps64_t;
+
+
+#endif
+
diff --git a/src/libgamma.h b/src/libgamma.h
new file mode 100644
index 0000000..d6b727c
--- /dev/null
+++ b/src/libgamma.h
@@ -0,0 +1,28 @@
+/**
+ * libgamma — Display server abstraction layer for gamma ramp adjustments
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This library 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 library 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 library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef LIBGAMMA_H
+#define LIBGAMMA_H
+
+
+#include "libgamma-method.h"
+#include "libgamma-facade.h"
+#include "libgamma-error.h"
+
+
+#endif
+