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-rw-r--r--src/lib/gamma-w32-gdi.c37
1 files changed, 29 insertions, 8 deletions
diff --git a/src/lib/gamma-w32-gdi.c b/src/lib/gamma-w32-gdi.c
index f8c00ee..0cc6b07 100644
--- a/src/lib/gamma-w32-gdi.c
+++ b/src/lib/gamma-w32-gdi.c
@@ -35,6 +35,11 @@
#include <errno.h>
+
+/**
+ * The gamma ramp size that devices will
+ * always have in Windows GDI.
+ */
#define GAMMA_RAMP_SIZE 256
@@ -45,21 +50,29 @@
*/
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
| LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT;
+ /* 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 support... */
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;
@@ -67,6 +80,7 @@ void libgamma_w32_gdi_method_capabilities(libgamma_method_capabilities_t* restri
this->real = 0;
# endif
#else
+ /* It is real and not fake if we are running on Windows. */
this->fake = 0;
this->real = 1;
#endif
@@ -89,11 +103,8 @@ void libgamma_w32_gdi_method_capabilities(libgamma_method_capabilities_t* restri
int libgamma_w32_gdi_site_initialise(libgamma_site_state_t* restrict this,
char* restrict site)
{
- if (site != NULL)
- return LIBGAMMA_NO_SUCH_SITE;
-
this->partitions_available = 1;
- return 0;
+ return site != NULL ? LIBGAMMA_NO_SUCH_SITE : 0;
}
@@ -199,7 +210,8 @@ int libgamma_w32_gdi_crtc_initialise(libgamma_crtc_state_t* restrict this,
this->data = NULL;
- display.cb = sizeof(DISPLAY_DEVICE); /* Windows's API mandates this... */
+ /* 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;
@@ -255,33 +267,38 @@ int libgamma_w32_gdi_get_crtc_information(libgamma_crtc_information_t* restrict
libgamma_crtc_state_t* restrict crtc, int32_t fields)
{
#define KNOWN_FIELDS (LIBGAMMA_CRTC_INFO_GAMMA_SIZE | LIBGAMMA_CRTC_INFO_GAMMA_DEPTH | LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT)
-
#define _E(FIELD) ((fields & FIELD) ? LIBGAMMA_CRTC_INFO_NOT_SUPPORTED : 0)
+ /* 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. */
if ((fields & LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT))
this->gamma_support = GetDeviceCaps(crtc->data, COLORMGMTCAPS) == CM_GAMMA_RAMP;
this->gamma_support_error = 0;
+ /* 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);
-#undef _E
-
+ /* There was a failure if and only if unsupport field was requested. */
return (fields & ~KNOWN_FIELDS) ? -1 : 0;
+#undef _E
#undef KNOWN_FIELDS
}
@@ -298,11 +315,13 @@ int libgamma_w32_gdi_crtc_get_gamma_ramps(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps_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;
@@ -321,11 +340,13 @@ int libgamma_w32_gdi_crtc_set_gamma_ramps(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps_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;