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Diffstat (limited to 'src/lib/gamma-w32-gdi.c')
| -rw-r--r-- | src/lib/gamma-w32-gdi.c | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/src/lib/gamma-w32-gdi.c b/src/lib/gamma-w32-gdi.c new file mode 100644 index 0000000..f8c00ee --- /dev/null +++ b/src/lib/gamma-w32-gdi.c @@ -0,0 +1,333 @@ +/** + * 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_W32_GDI +# error Compiling gamma-w32-gdi.c without HAVE_LIBGAMMA_METHOD_W32_GDI +#endif + +#include "gamma-w32-gdi.h" + +#include "libgamma-error.h" + +#ifndef WINVER +# define WINVER 0x0500 +#endif +#ifdef FAKE_LIBGAMMA_METHOD_W32_GDI +# include "fake-w32-gdi.h" +#else +# include <windows.h> +# include <wingdi.h> +#endif + +#include <errno.h> + +#define GAMMA_RAMP_SIZE 256 + + +/** + * Return the capabilities of the adjustment method. + * + * @param this The data structure to fill with the method's capabilities. + */ +void libgamma_w32_gdi_method_capabilities(libgamma_method_capabilities_t* restrict this) +{ + this->crtc_information = LIBGAMMA_CRTC_INFO_GAMMA_SIZE + | LIBGAMMA_CRTC_INFO_GAMMA_DEPTH + | LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT; + this->default_site_known = 1; + this->multiple_sites = 0; + this->multiple_partitions = 0; + 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 = 1; + this->fixed_gamma_depth = 1; +#ifdef FAKE_LIBGAMMA_METHOD_W32_GDI + this->fake = 1; +# ifdef HAVE_LIBGAMMA_METHOD_X_RANDR + this->real = 1; +# else + this->real = 0; +# endif +#else + this->fake = 0; + this->real = 1; +#endif +} + + +/** + * 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_w32_gdi_site_initialise(libgamma_site_state_t* restrict this, + char* restrict site) +{ + if (site != NULL) + return LIBGAMMA_NO_SUCH_SITE; + + this->partitions_available = 1; + return 0; +} + + +/** + * Release all resources held by a site state. + * + * @param this The site state. + */ +void libgamma_w32_gdi_site_destroy(libgamma_site_state_t* restrict this) +{ + (void) this; +} + + +/** + * 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_w32_gdi_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_w32_gdi_partition_initialise(libgamma_partition_state_t* restrict this, + libgamma_site_state_t* restrict site, size_t partition) +{ + DWORD n = 0; + DISPLAY_DEVICE display; + + (void) site; + + if (partition != 0) + return LIBGAMMA_NO_SUCH_PARTITION; + + /* Count CRTC:s by iteration over all possible identifiers + until we reach on that does not exist. */ + display.cb = sizeof(DISPLAY_DEVICE); + while (EnumDisplayDevices(NULL, n, &display, 0)) + if (n++, n == 0) + return LIBGAMMA_IMPOSSIBLE_AMOUNT; + this->crtcs_available = (size_t)n; + return 0; +} + + +/** + * Release all resources held by a partition state. + * + * @param this The partition state. + */ +void libgamma_w32_gdi_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_w32_gdi_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_w32_gdi_crtc_initialise(libgamma_crtc_state_t* restrict this, + libgamma_partition_state_t* restrict partition, size_t crtc) +{ + DISPLAY_DEVICE display; + HDC context; + + (void) partition; + + this->data = NULL; + + display.cb = sizeof(DISPLAY_DEVICE); /* Windows's API mandates this... */ + /* Get identifier for selected CRTC. */ + if (!EnumDisplayDevices(NULL, (DWORD)crtc, &display, 0)) + return LIBGAMMA_NO_SUCH_CRTC; + /* Check that the connector is enabled, + * newer versions of Windows will always pass. */ + if (!(display.StateFlags & DISPLAY_DEVICE_ACTIVE)) + return LIBGAMMA_CONNECTOR_DISABLED; + /* Acquire CRTC connection. */ + context = CreateDC(TEXT("DISPLAY"), display.DeviceName, NULL, NULL); + if (context == NULL) + return LIBGAMMA_OPEN_CRTC_FAILED; + this->data = context; + return 0; +} + + +/** + * Release all resources held by a CRTC state. + * + * @param this The CRTC state. + */ +void libgamma_w32_gdi_crtc_destroy(libgamma_crtc_state_t* restrict this) +{ + if (this->data) + ReleaseDC(NULL, this->data); +} + + +/** + * 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_w32_gdi_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_w32_gdi_get_crtc_information(libgamma_crtc_information_t* restrict this, + libgamma_crtc_state_t* restrict crtc, int32_t fields) +{ +#define KNOWN_FIELDS (LIBGAMMA_CRTC_INFO_GAMMA_SIZE | LIBGAMMA_CRTC_INFO_GAMMA_DEPTH | LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT) + +#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->red_gamma_size = GAMMA_RAMP_SIZE; + this->green_gamma_size = GAMMA_RAMP_SIZE; + this->blue_gamma_size = GAMMA_RAMP_SIZE; + this->gamma_size_error = 0; + this->gamma_depth = 16; + this->gamma_depth_error = 0; + if ((fields & LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT)) + this->gamma_support = GetDeviceCaps(crtc->data, COLORMGMTCAPS) == CM_GAMMA_RAMP; + this->gamma_support_error = 0; + 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 & ~KNOWN_FIELDS) ? -1 : 0; + +#undef KNOWN_FIELDS +} + + +/** + * 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_w32_gdi_crtc_get_gamma_ramps(libgamma_crtc_state_t* restrict this, + libgamma_gamma_ramps_t* restrict ramps) +{ +#ifdef DEBUG + if ((ramps-> red_size != GAMMA_RAMP_SIZE) || + (ramps->green_size != GAMMA_RAMP_SIZE) || + (ramps-> blue_size != GAMMA_RAMP_SIZE)) + return LIBGAMMA_WRONG_GAMMA_RAMP_SIZE; +#endif + if (!GetDeviceGammaRamp(this->data, ramps->red)) + 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_w32_gdi_crtc_set_gamma_ramps(libgamma_crtc_state_t* restrict this, + libgamma_gamma_ramps_t ramps) +{ +#ifdef DEBUG + if ((ramps. red_size != GAMMA_RAMP_SIZE) || + (ramps.green_size != GAMMA_RAMP_SIZE) || + (ramps. blue_size != GAMMA_RAMP_SIZE)) + return LIBGAMMA_WRONG_GAMMA_RAMP_SIZE; +#endif + if (!SetDeviceGammaRamp(this->data, ramps.red)) + return LIBGAMMA_GAMMA_RAMP_WRITE_FAILED; + return 0; +} + |