/* See LICENSE file for copyright and license details. */ #ifndef HAVE_LIBGAMMA_METHOD_X_VIDMODE # error Compiling gamma-x-vidmode.c without HAVE_LIBGAMMA_METHOD_X_VIDMODE #endif #include "gamma-x-vidmode.h" #include "libgamma-error.h" #include #include #include #include /** * Return the capabilities of the adjustment method * * @param this The data structure to fill with the method's capabilities */ void libgamma_x_vidmode_method_capabilities(libgamma_method_capabilities_t *restrict this) { char *restrict display = getenv("DISPLAY"); /* Gamma ramps size and depth can be queried */ this->crtc_information = LIBGAMMA_CRTC_INFO_GAMMA_SIZE | LIBGAMMA_CRTC_INFO_GAMMA_DEPTH; /* X VidMode supports multiple sites and partitions but not CRTC:s */ this->default_site_known = (display && *display) ? 1 : 0; this->multiple_sites = 1; this->multiple_partitions = 1; this->multiple_crtcs = 0; /* Partitions are screens and not graphics cards in X */ this->partitions_are_graphics_cards = 0; /* X does not have system restore capabilities */ this->site_restore = 0; this->partition_restore = 0; this->crtc_restore = 0; /* Gamma ramp sizes are identical but not fixed */ this->identical_gamma_sizes = 1; this->fixed_gamma_size = 0; /* Gamma ramp depths are fixed */ this->fixed_gamma_depth = 1; /* X VidMode is a real non-faked adjustment method */ this->real = 1; this->fake = 0; /* Gamma ramp adjustments are persistent */ this->auto_restore = 0; } /** * Initialise an allocated site state * * @param this The site state to initialise * @param site The site identifier, unless it is `NULL` it must a * `free`:able. Once 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. Note however that it will * not be free:d if this function fails. * @return Zero on success, otherwise (negative) the value of an * error identifier provided by this library */ int libgamma_x_vidmode_site_initialise(libgamma_site_state_t *restrict this, char *restrict site) { /* Connect to the display */ Display *restrict connection; int _major, _minor, screens; this->data = connection = XOpenDisplay(site); if (!this->data) return LIBGAMMA_OPEN_SITE_FAILED; /* Query X VidMode extension protocol version */ if (!XF86VidModeQueryVersion(connection, &_major, &_minor)) { XCloseDisplay(connection); return LIBGAMMA_PROTOCOL_VERSION_QUERY_FAILED; } /* Query the number of available screens */ screens = ScreenCount(connection); if (screens < 0) { XCloseDisplay(connection); return LIBGAMMA_NEGATIVE_PARTITION_COUNT; } this->partitions_available = (size_t)screens; return 0; } /** * Release all resources held by a site state * * @param this The site state */ void libgamma_x_vidmode_site_destroy(libgamma_site_state_t *restrict this) { XCloseDisplay((Display *)this->data); } /** * Restore the gamma ramps all CRTC:s 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_x_vidmode_site_restore(libgamma_site_state_t *restrict this) { (void) this; errno = ENOTSUP; return LIBGAMMA_ERRNO_SET; } /** * 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_x_vidmode_partition_initialise(libgamma_partition_state_t *restrict this, libgamma_site_state_t *restrict site, size_t partition) { this->crtcs_available = 1; return partition < site->partitions_available ? 0 : LIBGAMMA_NO_SUCH_PARTITION; } /** * Release all resources held by a partition state * * @param this The partition state */ void libgamma_x_vidmode_partition_destroy(libgamma_partition_state_t *restrict this) { (void) this; } /** * Restore the gamma ramps all CRTC:s 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_x_vidmode_partition_restore(libgamma_partition_state_t *restrict this) { (void) this; errno = ENOTSUP; return LIBGAMMA_ERRNO_SET; } /** * 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_x_vidmode_crtc_initialise(libgamma_crtc_state_t *restrict this, libgamma_partition_state_t *restrict partition, size_t crtc) { (void) this; (void) partition; return !crtc ? 0 : LIBGAMMA_NO_SUCH_CRTC; } /** * Release all resources held by a CRTC state * * @param this The CRTC state */ void libgamma_x_vidmode_crtc_destroy(libgamma_crtc_state_t *restrict this) { (void) 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_x_vidmode_crtc_restore(libgamma_crtc_state_t *restrict this) { (void) this; errno = ENOTSUP; return LIBGAMMA_ERRNO_SET; } /** * 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 fields OR:ed identifiers for the information about the CRTC that should be read * @return Zero on success, -1 on error; oOn error refer to the error reports in `this` */ int libgamma_x_vidmode_get_crtc_information(libgamma_crtc_information_t *restrict this, libgamma_crtc_state_t *restrict crtc, int32_t fields) { #define _E(FIELD) ((fields & FIELD) ? LIBGAMMA_CRTC_INFO_NOT_SUPPORTED : 0) Display *restrict connection; int stops = 0; /* X VidMode does not support EDID or monitor dimensions */ this->edid_error = _E(LIBGAMMA_CRTC_INFO_EDID); this->width_mm_error = _E(LIBGAMMA_CRTC_INFO_WIDTH_MM); this->height_mm_error = _E(LIBGAMMA_CRTC_INFO_HEIGHT_MM); this->width_mm_edid_error = _E(LIBGAMMA_CRTC_INFO_WIDTH_MM_EDID); this->height_mm_edid_error = _E(LIBGAMMA_CRTC_INFO_HEIGHT_MM_EDID); this->gamma_size_error = 0; /* X VidMode does support gamma ramp size query. The gamma ramps are identical but not fixed, and the query can fail. */ if ((fields & LIBGAMMA_CRTC_INFO_GAMMA_SIZE)) { connection = crtc->partition->site->data; if (!XF86VidModeGetGammaRampSize(connection, (int)crtc->partition->partition, &stops)) this->gamma_size_error = LIBGAMMA_GAMMA_RAMPS_SIZE_QUERY_FAILED; else if (stops < 2) this->gamma_size_error = LIBGAMMA_SINGLETON_GAMMA_RAMP; this->red_gamma_size = this->green_gamma_size = this->blue_gamma_size = (size_t)stops; } /* X VidMode uses 16-bit integer ramps */ this->gamma_depth = 16; this->gamma_depth_error = 0; /* X VidMode does not support gamma ramp support queries */ this->gamma_support_error = _E(LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT); /* X VidMode does not support EDID or connector information */ this->subpixel_order_error = _E(LIBGAMMA_CRTC_INFO_SUBPIXEL_ORDER); this->active_error = _E(LIBGAMMA_CRTC_INFO_ACTIVE); this->connector_name_error = _E(LIBGAMMA_CRTC_INFO_CONNECTOR_NAME); this->connector_type_error = _E(LIBGAMMA_CRTC_INFO_CONNECTOR_TYPE); this->gamma_error = _E(LIBGAMMA_CRTC_INFO_GAMMA); /* We failed if gamma ramp size query failed or if an unsupport field was queried. */ return (this->gamma_size_error || (fields & ~(LIBGAMMA_CRTC_INFO_GAMMA_DEPTH | LIBGAMMA_CRTC_INFO_GAMMA_SIZE))) ? -1 : 0; #undef _E } /** * Get the current gamma ramps for a CRTC, 16-bit gamma-depth version * * @param this The CRTC state * @param 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_x_vidmode_crtc_get_gamma_ramps16(libgamma_crtc_state_t *restrict this, libgamma_gamma_ramps16_t *restrict ramps) { #ifdef DEBUG /* Gamma ramp sizes are identical but not fixed */ if (ramps->red_size != ramps->green_size || ramps->red_size != ramps->blue_size) return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE; #endif /* Read current gamma ramps */ if (!XF86VidModeGetGammaRamp((Display *)this->partition->site->data, (int)this->partition->partition, (int)ramps->red_size, ramps->red, ramps->green, ramps->blue)) return LIBGAMMA_GAMMA_RAMP_READ_FAILED; return 0; } /** * Set the gamma ramps for a CRTC, 16-bit gamma-depth version * * @param this The CRTC state * @param ramps The gamma ramps to apply * @return Zero on success, otherwise (negative) the value of an * error identifier provided by this library */ int libgamma_x_vidmode_crtc_set_gamma_ramps16(libgamma_crtc_state_t *restrict this, libgamma_gamma_ramps16_t ramps) { #ifdef DEBUG /* Gamma ramp sizes are identical but not fixed */ if (ramps.red_size != ramps.green_size || ramps.red_size != ramps.blue_size) return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE; #endif /* Apply gamma ramps */ if (!XF86VidModeSetGammaRamp((Display *)this->partition->site->data, (int)this->partition->partition, (int)ramps.red_size, ramps.red, ramps.green, ramps.blue)) return LIBGAMMA_GAMMA_RAMP_WRITE_FAILED; return 0; }