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-rw-r--r--libgamma_w32_gdi_crtc_initialise.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/libgamma_w32_gdi_crtc_initialise.c b/libgamma_w32_gdi_crtc_initialise.c
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+++ b/libgamma_w32_gdi_crtc_initialise.c
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+/* 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;
+}