move files around

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

1 files changed, 1154 insertions, 0 deletions

diff --git a/src/lib/libgamma-method.h b/src/lib/libgamma-method.h
new file mode 100644
index 0000000..8496631
--- /dev/null
+++ b/src/lib/libgamma-method.h
@@ -0,0 +1,1154 @@
+/**
+ * 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
+
+#if !defined(LIBGAMMA_CONFIG_H) && !defined(DEBUG)
+# error libgamma-method.h should not be included directly, include libgamma.h instead
+#endif
+
+
+#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.
+ */
+#define LIBGAMMA_METHOD_DUMMY  0
+
+/**
+ * The identifier for the adjustment method with
+ * uses the RandR protocol under the X display server.
+ */
+#define LIBGAMMA_METHOD_X_RANDR  1
+
+/**
+ * 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
+ * work on some drivers that are not supported by RandR,
+ * however it can only control the primary CRTC per
+ * screen (partition).
+ */
+#define LIBGAMMA_METHOD_X_VIDMODE  2
+
+/**
+ * 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.
+ */
+#define LIBGAMMA_METHOD_LINUX_DRM  3
+
+/**
+ * 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.
+ */
+#define LIBGAMMA_METHOD_W32_GDI  4
+
+/**
+ * The identifier for the CoreGraphics 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.
+ */
+#define LIBGAMMA_METHOD_QUARTZ_CORE_GRAPHICS  5
+
+
+/**
+ * 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 LIBGAMMA_METHOD_MAX  5
+
+/**
+ * The number adjustment methods provided by this library.
+ * Note however that this includes adjstment methods that
+ * have been removed at compile-time.
+ */
+#define LIBGAMMA_METHOD_COUNT  (LIBGAMMA_METHOD_MAX + 1)
+
+
+
+/**
+ * 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.
+   */
+  unsigned default_site_known : 1;
+  
+  /**
+   * Whether the adjustment method supports multiple sites rather
+   * than just the default site.
+   */
+  unsigned multiple_sites : 1;
+  
+  /**
+   * Whether the adjustment method supports multiple partitions
+   * per site.
+   */
+  unsigned multiple_partitions : 1;
+  
+  /**
+   * Whether the adjustment method supports multiple CRTC:s
+   * per partition per site.
+   */
+  unsigned multiple_crtcs : 1;
+  
+  /**
+   * Whether the partition to graphics card is a bijection.
+   */
+  unsigned partitions_are_graphics_cards : 1;
+  
+  /**
+   * Whether the adjustment method supports `libgamma_site_restore`.
+   */
+  unsigned site_restore : 1;
+  
+  /**
+   * Whether the adjustment method supports `libgamma_partition_restore`.
+   */
+  unsigned partition_restore : 1;
+  
+  /**
+   * Whether the adjustment method supports `libgamma_crtc_restore`.
+   */
+  unsigned crtc_restore : 1;
+    
+  /**
+   * Whether the `red_gamma_size`, `green_gamma_size` and `blue_gamma_size`
+   * fields in `libgamma_crtc_information_t` will always have the same
+   * values as each other for the adjustment method.
+   */
+  unsigned identical_gamma_sizes : 1;
+  
+  /**
+   * Whether the `red_gamma_size`, `green_gamma_size` and `blue_gamma_size`
+   * fields in `libgamma_crtc_information_t` will always be filled with the
+   * same value for the adjustment method.
+   */
+  unsigned 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.
+   */
+  unsigned fixed_gamma_depth : 1;
+  
+  /**
+   * Whether the adjustment method will actually perform adjustments.
+   */
+  unsigned real : 1;
+  
+  /**
+   * Whether the adjustment method is implement using a translation layer.
+   */
+  unsigned 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* partition;
+  
+  /**
+   * The index of the CRTC within its partition.
+   */
+  size_t crtc;
+  
+} libgamma_crtc_state_t;
+
+
+/**
+ * Types for connectors.
+ */
+typedef enum libgamma_connector_type
+  {
+    /**
+     * The adjustment method does not know the connector's type
+     * (This could be considered an error).
+     */
+    LIBGAMMA_CONNECTOR_TYPE_Unknown,
+    
+    /**
+     * Video Graphics Array (VGA).
+     */
+    LIBGAMMA_CONNECTOR_TYPE_VGA,
+    
+    /**
+     * Digital Visual Interface, integrated (DVI-I).
+     */
+    LIBGAMMA_CONNECTOR_TYPE_DVII,
+    
+    /**
+     * Digital Visual Interface, digital only (DVI-D).
+     */
+    LIBGAMMA_CONNECTOR_TYPE_DVID,
+    
+    /**
+     * Digital Visual Interface, analogue only (DVI-A).
+     */
+    LIBGAMMA_CONNECTOR_TYPE_DVIA,
+    
+    /**
+     * Composite video.
+     */
+    LIBGAMMA_CONNECTOR_TYPE_Composite,
+    
+    /**
+     * Separate Video (S-video).
+     */
+    LIBGAMMA_CONNECTOR_TYPE_SVIDEO,
+    
+    /**
+     * Low-voltage differential signaling (LVDS).
+     */
+    LIBGAMMA_CONNECTOR_TYPE_LVDS,
+    
+    /**
+     * Component video, usally separate cables for each channel.
+     */
+    LIBGAMMA_CONNECTOR_TYPE_Component,
+    
+    /**
+     * 9 pin DIN (Deutsches Institut für Normung) connector.
+     */
+    LIBGAMMA_CONNECTOR_TYPE_9PinDIN,
+    
+    /**
+     * DisplayPort.
+     */
+    LIBGAMMA_CONNECTOR_TYPE_DisplayPort,
+    
+    /**
+     * High-Definition Multimedia Interface (HDMI), unknown type.
+     */
+    LIBGAMMA_CONNECTOR_TYPE_HDMI,
+    
+    /**
+     * High-Definition Multimedia Interface, type A (HDMI-A).
+     */
+    LIBGAMMA_CONNECTOR_TYPE_HDMIA,
+    
+    /**
+     * High-Definition Multimedia Interface, type B (HDMI-B).
+     */
+    LIBGAMMA_CONNECTOR_TYPE_HDMIB,
+    
+    /**
+     * Television, unknown connector.
+     */
+    LIBGAMMA_CONNECTOR_TYPE_TV,
+    
+    /**
+     * Embedded DisplayPort (eDP).
+     */
+    LIBGAMMA_CONNECTOR_TYPE_eDP,
+    
+    /**
+     * A virtual connector.
+     */
+    LIBGAMMA_CONNECTOR_TYPE_VIRTUAL,
+    
+    /**
+     * Display Serial Interface (DSI).
+     */
+    LIBGAMMA_CONNECTOR_TYPE_DSI,
+    
+    /**
+     * LFP connector.
+     * (If you know what this is add it to Wikipedia.)
+     */
+    LIBGAMMA_CONNECTOR_TYPE_LFP
+    
+  } libgamma_connector_type_t;
+
+/**
+ * The number of values defined in `libgamma_connector_type_t`.
+ */
+#define LIBGAMMA_CONNECTOR_TYPE_COUNT  19
+
+/**
+ * Orders for subpixels. Currently the possible values are
+ * very biased to LCD, Plasma and monochrome monitors.
+ */
+typedef enum libgamma_subpixel_order
+  {
+    /**
+     * The adjustment method does not know the order of the subpixels.
+     * (This could be considered an error.)
+     */
+    LIBGAMMA_SUBPIXEL_ORDER_UNKNOWN,
+    
+    /**
+     * There are no subpixels in the monitor.
+     */
+    LIBGAMMA_SUBPIXEL_ORDER_NONE,
+    
+    /**
+     * The subpixels are ordered red, green and then blue, from left to right.
+     */
+    LIBGAMMA_SUBPIXEL_ORDER_HORIZONTAL_RGB,
+    
+    /**
+     * The subpixels are ordered blue, green and then red, from left to right.
+     */
+    LIBGAMMA_SUBPIXEL_ORDER_HORIZONTAL_BGR,
+    
+    /**
+     * The subpixels are ordered red, green and then blue, from the top down.
+     */
+    LIBGAMMA_SUBPIXEL_ORDER_VERTICAL_RGB,
+    
+    /**
+     * The subpixels are ordered blue, green and then red, from the top down.
+     */
+    LIBGAMMA_SUBPIXEL_ORDER_VERTICAL_BGR
+    
+  } libgamma_subpixel_order_t;
+
+/**
+ * The number of values defined in `libgamma_subpixel_order_t`.
+ */
+#define LIBGAMMA_SUBPIXEL_ORDER_COUNT  6
+
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * values for `edid` and `edid_length` and report errors to `edid_error`.
+ */
+#define LIBGAMMA_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 LIBGAMMA_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 LIBGAMMA_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 LIBGAMMA_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 LIBGAMMA_CRTC_INFO_HEIGHT_MM_EDID  (1 << 4)
+
+/**
+ * For a `libgamma_crtc_information_t` fill in the
+ * values for `red_gamma_size`, `green_gamma_size` and `blue_gamma_size`.
+ * and report errors to `gamma_size_error`
+ */
+#define LIBGAMMA_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 LIBGAMMA_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 LIBGAMMA_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 LIBGAMMA_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 LIBGAMMA_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 LIBGAMMA_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 LIBGAMMA_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 LIBGAMMA_CRTC_INFO_GAMMA  (1 << 12)
+
+/**
+ * The number of `LIBGAMMA_CRTC_INFO_*` values defined.
+ */
+#define LIBGAMMA_CRTC_INFO_COUNT  13
+
+
+/**
+ * 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 axis of the red gamma ramp.
+   */
+  size_t red_gamma_size;
+  
+  /**
+   * The size of the encoding axis of the green gamma ramp.
+   */
+  size_t green_gamma_size;
+  
+  /**
+   * The size of the encoding axis of the blue gamma ramp.
+   */
+  size_t blue_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,
+   * -1 for single precision floating point, and -2 for
+   * double precision floating point.
+   */
+  signed 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 — especially for CRT:s —
+   * but it is provided anyway as a means of distinguishing monitors.
+   */
+  libgamma_subpixel_order_t 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.
+   */
+  libgamma_connector_type_t 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;
+
+
+/**
+ * Gamma ramp structure for `float` gamma ramps.
+ */
+typedef struct libgamma_gamma_rampsf
+{
+  /**
+   * 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.
+   */
+  float* red;
+  
+  /**
+   * The gamma ramp for the green channel.
+   */
+  float* green;
+  
+  /**
+   * The gamma ramp for the blue channel.
+   */
+  float* blue;
+  
+} libgamma_gamma_rampsf_t;
+
+
+/**
+ * Gamma ramp structure for `double` gamma ramps.
+ */
+typedef struct libgamma_gamma_rampsd
+{
+  /**
+   * 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.
+   */
+  double* red;
+  
+  /**
+   * The gamma ramp for the green channel.
+   */
+  double* green;
+  
+  /**
+   * The gamma ramp for the blue channel.
+   */
+  double* blue;
+  
+} libgamma_gamma_rampsd_t;
+
+
+
+/**
+ * Initialise a gamma ramp in the proper way that allows all adjustment
+ * methods to read from and write to it without causing segmentation violation.
+ * 
+ * The input must have `red_size`, `green_size` and `blue_size` set to the
+ * sizes of the gamma ramps that should be allocated.
+ * 
+ * @param   this  The gamma ramps.
+ * @return        Zero on success, -1 on allocation error, `errno` will be set accordingly.
+ */
+int libgamma_gamma_ramps_initialise(libgamma_gamma_ramps_t* restrict this);
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_ramps_initialise` or otherwise
+ * initialises in the proper manner.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_ramps_destroy(libgamma_gamma_ramps_t* restrict this);
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_ramps_initialise` or otherwise
+ * initialises in the proper manner, as well as release the pointer
+ * to the structure.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_ramps_free(libgamma_gamma_ramps_t* restrict this);
+
+
+/**
+ * Initialise a gamma ramp in the proper way that allows all adjustment
+ * methods to read from and write to it without causing segmentation violation.
+ * 
+ * The input must have `red_size`, `green_size` and `blue_size` set to the
+ * sizes of the gamma ramps that should be allocated.
+ * 
+ * @param   this  The gamma ramps.
+ * @return        Zero on success, -1 on allocation error, `errno` will be set accordingly.
+ */
+int libgamma_gamma_ramps32_initialise(libgamma_gamma_ramps32_t* restrict this);
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_ramps32_initialise` or otherwise
+ * initialises in the proper manner.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_ramps32_destroy(libgamma_gamma_ramps32_t* restrict this);
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_ramps32_initialise` or otherwise
+ * initialises in the proper manner, as well as release the pointer
+ * to the structure.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_ramps32_free(libgamma_gamma_ramps32_t* restrict this);
+
+
+/**
+ * Initialise a gamma ramp in the proper way that allows all adjustment
+ * methods to read from and write to it without causing segmentation violation.
+ * 
+ * The input must have `red_size`, `green_size` and `blue_size` set to the
+ * sizes of the gamma ramps that should be allocated.
+ * 
+ * @param   this  The gamma ramps.
+ * @return        Zero on success, -1 on allocation error, `errno` will be set accordingly.
+ */
+int libgamma_gamma_ramps64_initialise(libgamma_gamma_ramps64_t* restrict this);
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_ramps64_initialise` or otherwise
+ * initialises in the proper manner.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_ramps64_destroy(libgamma_gamma_ramps64_t* restrict this);
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_ramps64_initialise` or otherwise
+ * initialises in the proper manner, as well as release the pointer
+ * to the structure.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_ramps64_free(libgamma_gamma_ramps64_t* restrict this);
+
+
+/**
+ * Initialise a gamma ramp in the proper way that allows all adjustment
+ * methods to read from and write to it without causing segmentation violation.
+ * 
+ * The input must have `red_size`, `green_size` and `blue_size` set to the
+ * sizes of the gamma ramps that should be allocated.
+ * 
+ * @param   this  The gamma ramps.
+ * @return        Zero on success, -1 on allocation error, `errno` will be set accordingly.
+ */
+int libgamma_gamma_rampsf_initialise(libgamma_gamma_rampsf_t* restrict this);
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_rampsf_initialise` or otherwise
+ * initialises in the proper manner.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_rampsf_destroy(libgamma_gamma_rampsf_t* restrict this);
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_rampsf_initialise` or otherwise
+ * initialises in the proper manner, as well as release the pointer
+ * to the structure.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_rampsf_free(libgamma_gamma_rampsf_t* restrict this);
+
+
+/**
+ * Initialise a gamma ramp in the proper way that allows all adjustment
+ * methods to read from and write to it without causing segmentation violation.
+ * 
+ * The input must have `red_size`, `green_size` and `blue_size` set to the
+ * sizes of the gamma ramps that should be allocated.
+ * 
+ * @param   this  The gamma ramps
+ * @return        Zero on success, -1 on allocation error, `errno` will be set accordingly.
+ */
+int libgamma_gamma_rampsd_initialise(libgamma_gamma_rampsd_t* restrict this);
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_rampsd_initialise` or otherwise
+ * initialises in the proper manner.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_rampsd_destroy(libgamma_gamma_rampsd_t* restrict this);
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_rampsd_initialise` or otherwise
+ * initialises in the proper manner, as well as release the pointer
+ * to the structure.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_rampsd_free(libgamma_gamma_rampsd_t* restrict this);
+
+
+
+#endif
+