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authorMattias Andrée <maandree@operamail.com>2014-05-31 07:32:09 +0200
committerMattias Andrée <maandree@operamail.com>2014-05-31 07:32:09 +0200
commitbdeb7f77f16b1e482904866ff21e43f8bfc01bb0 (patch)
treee5587a577db53a58ea52fd2579fa0cbb89007491 /src/lib/gamma-x-vidmode.c
parentsplit out error identification for failure of open from libgamma_linux_drm_partition_initialise (diff)
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Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to 'src/lib/gamma-x-vidmode.c')
-rw-r--r--src/lib/gamma-x-vidmode.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/src/lib/gamma-x-vidmode.c b/src/lib/gamma-x-vidmode.c
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+/**
+ * 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 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");
+ this->crtc_information = LIBGAMMA_CRTC_INFO_GAMMA_SIZE
+ | LIBGAMMA_CRTC_INFO_GAMMA_DEPTH;
+ this->default_site_known = (display && *display);
+ this->multiple_sites = 1;
+ this->multiple_partitions = 1;
+ this->multiple_crtcs = 1;
+ this->partitions_are_graphics_cards = 0;
+ this->site_restore = 0;
+ this->partition_restore = 0;
+ this->crtc_restore = 0;
+ this->identical_gamma_sizes = 1;
+ this->fixed_gamma_size = 0;
+ this->fixed_gamma_depth = 1;
+ this->real = 1;
+ this->fake = 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. 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. 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)
+{
+ Display* restrict connection = XOpenDisplay(site);
+ int _major, _minor, screens;
+ if ((this->data = connection) == NULL)
+ return LIBGAMMA_OPEN_SITE_FAILED;
+ if (!XF86VidModeQueryVersion(connection, &_major, &_minor))
+ return LIBGAMMA_PROTOCOL_VERSION_QUERY_FAILED;
+ if ((screens = ScreenCount(connection)) < 0)
+ 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;
+ return errno = ENOTSUP, 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)
+{
+ if (partition >= site->partitions_available)
+ return LIBGAMMA_NO_SUCH_PARTITION;
+ this->crtcs_available = 1;
+ return 0;
+}
+
+
+/**
+ * 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;
+ return errno = ENOTSUP, 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 ? 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;
+ return errno = ENOTSUP, 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. On 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)
+
+ 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;
+ if ((fields & LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT))
+ {
+ Display* restrict connection = crtc->partition->site->data;
+ int stops;
+ 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;
+ else
+ this->red_gamma_size = this->green_gamma_size = this->blue_gamma_size = (size_t)stops;
+ }
+ this->gamma_depth = 16;
+ this->gamma_depth_error = 0;
+ this->gamma_support_error = _E(LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT);
+ 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);
+
+#undef _E
+
+ return (fields & ~(LIBGAMMA_CRTC_INFO_GAMMA_DEPTH | LIBGAMMA_CRTC_INFO_GAMMA_SIZE)) ? -1 : this->gamma_size_error;
+}
+
+
+/**
+ * Get current the 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_ramps(libgamma_crtc_state_t* restrict this,
+ libgamma_gamma_ramps_t* restrict ramps)
+{
+#ifdef DEBUG
+ if ((ramps->red_size != ramps->green_size) ||
+ (ramps->red_size != ramps->blue_size))
+ return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE;
+#endif
+ 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_ramps(libgamma_crtc_state_t* restrict this,
+ libgamma_gamma_ramps_t ramps)
+{
+#ifdef DEBUG
+ if ((ramps.red_size != ramps.green_size) ||
+ (ramps.red_size != ramps.blue_size))
+ return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE;
+#endif
+ 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;
+}
+