diff options
Diffstat (limited to '')
| -rw-r--r-- | src/gamma-w32-gdi.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/src/gamma-w32-gdi.c b/src/gamma-w32-gdi.c index 5065641..50683a9 100644 --- a/src/gamma-w32-gdi.c +++ b/src/gamma-w32-gdi.c @@ -143,6 +143,8 @@ int libgamma_w32_gdi_partition_initialise(libgamma_partition_state_t* restrict t 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) @@ -196,11 +198,16 @@ int libgamma_w32_gdi_crtc_initialise(libgamma_crtc_state_t* restrict this, (void) partition; this->data = NULL; - display.cb = sizeof(DISPLAY_DEVICE); + + 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; |