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author | Mattias Andrée <maandree@kth.se> | 2021-03-05 18:23:13 +0100 |
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committer | Mattias Andrée <maandree@kth.se> | 2021-03-05 18:33:49 +0100 |
commit | f52513b09580c1533e6c48a4162d3d5f61f3b081 (patch) | |
tree | 141d0974a777f4ec5b51daed9879a2cb0d781505 /libgamma_w32_gdi_crtc_initialise.c | |
parent | Split source files, merge public header files, eliminite use gpp, rewrite makefile (diff) | |
download | libgamma-f52513b09580c1533e6c48a4162d3d5f61f3b081.tar.gz libgamma-f52513b09580c1533e6c48a4162d3d5f61f3b081.tar.bz2 libgamma-f52513b09580c1533e6c48a4162d3d5f61f3b081.tar.xz |
misc
Signed-off-by: Mattias Andrée <maandree@kth.se>
Diffstat (limited to '')
-rw-r--r-- | libgamma_w32_gdi_crtc_initialise.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/libgamma_w32_gdi_crtc_initialise.c b/libgamma_w32_gdi_crtc_initialise.c new file mode 100644 index 0000000..7bd2218 --- /dev/null +++ b/libgamma_w32_gdi_crtc_initialise.c @@ -0,0 +1,43 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + + + +/** + * 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; +} |