/** * libgammamm -- C++ wrapper for libgamma * Copyright (C) 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 . */ #ifndef LIBGAMMA_METHOD_HH #define LIBGAMMA_METHOD_HH #include #include "libgamma-native.hh" namespace libgamma { /** * Cathode ray tube controller information data structure. */ class CRTCInformation; /** * Capabilities of adjustment methods. */ class MethodCapabilities; /** * Site state. * * On operating systems that integrate a graphical environment * there is usually 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. */ class Site; /** * 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. */ class Partition; /** * 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. */ class CRTC; /** * Capabilities of adjustment methods. */ class MethodCapabilities { public: /** * Constructor. */ MethodCapabilities(); /** * Constructor. * * @param caps The information in the native structure. */ MethodCapabilities(libgamma_method_capabilities_t* caps); /** * Copy constructor. * * @param other The information to copy. */ MethodCapabilities(const MethodCapabilities& other); /** * Destructor. */ ~MethodCapabilities(); /** * Copy operator. * * @param other The information to copy. */ MethodCapabilities& operator =(const MethodCapabilities& other); /** * 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. */ bool default_site_known; /** * Whether the adjustment method supports multiple sites rather * than just the default site. */ bool multiple_sites; /** * Whether the adjustment method supports multiple partitions * per site. */ bool multiple_partitions; /** * Whether the adjustment method supports multiple CRTC:s * per partition per site. */ bool multiple_crtcs; /** * Whether the partition to graphics card is a bijection. */ bool partitions_are_graphics_cards; /** * Whether the adjustment method supports `libgamma_site_restore`. */ bool site_restore; /** * Whether the adjustment method supports `libgamma_partition_restore`. */ bool partition_restore; /** * Whether the adjustment method supports `libgamma_crtc_restore`. */ bool crtc_restore; /** * 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. */ bool identical_gamma_sizes; /** * 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. */ bool fixed_gamma_size; /** * Whether the `gamma_depth` field in `libgamma_crtc_information_t` * will always be filled with the same value for the adjustment method. */ bool fixed_gamma_depth; /** * Whether the adjustment method will actually perform adjustments. */ bool real; /** * Whether the adjustment method is implement using a translation layer. */ bool fake; }; /** * Types for connectors. */ typedef libgamma_connector_type_t ConnectorType; /** * Orders for subpixels. Currently the possible values are * very biased to LCD, Plasma and monochrome monitors. */ typedef libgamma_subpixel_order_t SubpixelOrder; /** * Cathode ray tube controller information data structure. */ class CRTCInformation { public: /** * Constructor. */ CRTCInformation(); /** * Constructor. * * @param info The information in the native structure. */ CRTCInformation(libgamma_crtc_information_t* info); /** * Copy constructor. * * @param other The information to copy. */ CRTCInformation(const CRTCInformation& other); /** * Destructor. */ ~CRTCInformation(); /** * Copy operator. * * @param other The information to copy. */ CRTCInformation& operator =(const CRTCInformation& other); /** * 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_length`. */ 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. */ SubpixelOrder 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. */ std::string* 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. */ ConnectorType 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; }; #ifdef __GCC__ # pragma GCC diagnostic push # pragma GCC diagnostic ignored "-Weffc++" /* Lets ignore that we do not override the copy constructor * and the copy operator. */ #endif /** * Site state. * * On operating systems that integrate a graphical environment * there is usually 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. */ class Site { public: /** * Constructor. */ Site(); /** * Constructor. * * @param method The adjustment method of the site. * @param site The site identifier, will be moved into * the structure, must be `delete`:able. */ Site(int method, std::string* site = nullptr); /** * Destructor. */ ~Site(); /** * Restore the gamma ramps all CRTC:s with a site to * the system settings. */ void restore(); /** * 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 `nullptr` or a string. * `nullptr` indicates the default site. On systems like the * Unix-like systems, where the graphics are pluggable, this * is usually resolved by an environment variable, such as * "DISPLAY" for X.org. */ std::string* 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; /** * The state in the native structure. */ libgamma_site_state_t* native; }; /** * 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. */ class Partition { public: /** * Constructor. */ Partition(); /** * Constructor. * * @param site The site of the partition. * @param partition The index of the partition. */ Partition(Site* site, size_t partition); /** * Destructor. */ ~Partition(); /** * Restore the gamma ramps all CRTC:s with a partition * to the system settings. */ void restore(); /** * The site this partition belongs to. */ Site* 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; /** * The state in the native structure. */ libgamma_partition_state_t* native; }; /** * 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. */ class CRTC { public: /** * Constructor. */ CRTC(); /** * Constructor. * * @param partition The partition of the CRTC. * @param crtc The index of the CRTC. */ CRTC(Partition* partition, size_t crtc); /** * Destructor. */ ~CRTC(); /** * Restore the gamma ramps for a CRTC to the system * settings for that CRTC. */ void restore(); /** * Read information about a CRTC. * * @param output Instance of a data structure to fill with the information about the CRTC. * @param fields OR:ed identifiers for the information about the CRTC that should be read. * @return Whether an error has occurred and is stored in a `*_error` field. */ bool information(CRTCInformation* output, int32_t fields); /** * The partition this CRTC belongs to. */ Partition* partition; /** * The index of the CRTC within its partition. */ size_t crtc; /** * The state in the native structure. */ libgamma_crtc_state_t* native; }; #ifdef __GCC__ # pragma GCC diagnostic pop #endif } #endif