/* See LICENSE file for copyright and license details. */ #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 # include #endif #include /** * The gamma ramp size that devices will always have in Windows GDI * * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd372194(v=vs.85).aspx */ #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) { /* Gamma ramps size, depth and support can be queried */ this->crtc_information = LIBGAMMA_CRTC_INFO_GAMMA_SIZE | LIBGAMMA_CRTC_INFO_GAMMA_DEPTH; /* Windows GDI does not support sites or partitions */ this->default_site_known = 1; this->multiple_sites = 0; this->multiple_partitions = 0; /* Windows GDI does support CRTC:s */ this->multiple_crtcs = 1; /* Partitions are not supported... */ this->partitions_are_graphics_cards = 0; /* Windows GDI does not have system restore capabilities */ this->site_restore = 0; this->partition_restore = 0; this->crtc_restore = 0; /* Ramps sizes are fixed and identical and ramp depth is too */ this->identical_gamma_sizes = 1; this->fixed_gamma_size = 1; this->fixed_gamma_depth = 1; /* Windows GDI is a real adjustment method that can be faked */ #ifdef FAKE_LIBGAMMA_METHOD_W32_GDI /* It is considered real but fake if it is translated to X RandR */ this->fake = 1; # ifdef HAVE_LIBGAMMA_METHOD_X_RANDR this->real = 1; # else this->real = 0; # endif #else /* It is real and not fake if we are running on Windows */ this->fake = 0; this->real = 1; #endif /* 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_w32_gdi_site_initialise(libgamma_site_state_t *restrict this, char* restrict site) { this->partitions_available = 1; return !site ? 0 : LIBGAMMA_NO_SUCH_SITE; } /** * 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; 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_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) 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++ == UINT32_MAX) 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; 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_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; /* Windows's API mandates this... */ display.cb = sizeof(DISPLAY_DEVICE); /* 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. * (According to w32's documentation, but that * that is a load of crap) */ if (!(display.StateFlags & DISPLAY_DEVICE_ACTIVE)) return LIBGAMMA_CONNECTOR_DISABLED; /* Acquire CRTC connection. */ context = CreateDC(TEXT("DISPLAY"), display.DeviceName, NULL, NULL); if (!context) 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; 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. 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) #define _E(FIELD) ((fields & FIELD) ? LIBGAMMA_CRTC_INFO_NOT_SUPPORTED : 0) (void) crtc; /* Windows GDI 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); /* Windows GDI have fixed gamma ramp sizes */ 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; /* Windows GDI have fixed gamma ramp depth */ this->gamma_depth = 16; this->gamma_depth_error = 0; /* It is possible to query Windows GDI whether the device have gamma ramp support. It cannot fail. However, I think the result is incorrect if multiple monitors are active, so we cannot include this. */ /* if ((fields & LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT)) this->gamma_support = GetDeviceCaps(crtc->data, COLORMGMTCAPS) == CM_GAMMA_RAMP; this->gamma_support_error = 0; */ this->gamma_support_error = _E(LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT); /* Windows GDI 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); /* There was a failure if and only if unsupport field was requested. */ return (fields & ~KNOWN_FIELDS) ? -1 : 0; #undef _E #undef KNOWN_FIELDS } /** * 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_w32_gdi_crtc_get_gamma_ramps16(libgamma_crtc_state_t *restrict this, libgamma_gamma_ramps16_t *restrict ramps) { #ifdef DEBUG /* Windows GDI have fixed gamma ramp sizes */ 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 /* Read current gamma ramps */ 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_ramps16(libgamma_crtc_state_t *restrict this, libgamma_gamma_ramps16_t ramps) { #ifdef DEBUG /* Windows GDI have fixed gamma ramp sizes */ 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 /* Apply gamma ramps */ if (!SetDeviceGammaRamp(this->data, ramps.red)) return LIBGAMMA_GAMMA_RAMP_WRITE_FAILED; return 0; }