diff options
Diffstat (limited to 'gamma-w32-gdi.c')
| -rw-r--r-- | gamma-w32-gdi.c | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/gamma-w32-gdi.c b/gamma-w32-gdi.c new file mode 100644 index 0000000..e93b53d --- /dev/null +++ b/gamma-w32-gdi.c @@ -0,0 +1,360 @@ +/* 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 <windows.h> +# include <wingdi.h> +#endif + +#include <errno.h> + + +/** + * 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; +} |