diff options
Diffstat (limited to 'gamma-x-vidmode.c')
| -rw-r--r-- | gamma-x-vidmode.c | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/gamma-x-vidmode.c b/gamma-x-vidmode.c new file mode 100644 index 0000000..bae9d31 --- /dev/null +++ b/gamma-x-vidmode.c @@ -0,0 +1,312 @@ +/* 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 <X11/Xlib.h> +#include <X11/extensions/xf86vmode.h> + +#include <stdlib.h> +#include <errno.h> + + +/** + * 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; +} |