diff options
Diffstat (limited to 'info/blueshift.texinfo')
| -rw-r--r-- | info/blueshift.texinfo | 62 |
1 files changed, 58 insertions, 4 deletions
diff --git a/info/blueshift.texinfo b/info/blueshift.texinfo index dc6fd16..68707ef 100644 --- a/info/blueshift.texinfo +++ b/info/blueshift.texinfo @@ -953,13 +953,13 @@ to a monitor. @item widthmm The physical width of the monitor, measured -in millimetres. @code{None} if unknown or if -not connected. +in millimetres. @code{None} if unknown, not +defined or if not connected. @item heightmm The physical height of the monitor, measured -in millimetres. @code{None} if unknown or if -not connected. +in millimetres. @code{None} if unknown, not +defined or if not connected. @item crtc The CRT controller index. @code{None} if not @@ -976,6 +976,14 @@ is used it is probably found because it is needed for plug and play support of the monitor. @end table +The width and height are unknown if the monitor +does not specify them in the EDID if using DRM. +They are not defined the output is a projector. +If using RandR this values are probably not +correct, but the EDID can be parsed, which is +want is done by DRM. The EDID can only specify +whole centrimeters up to 255 cm. + @code{Screens} and @code{Screen} provide a set of functions for finding the output, and traversal the CRTC and screen, a monitor is connected to: @@ -1013,6 +1021,52 @@ These functions returns a list of matching @code{Output}:s. The list is empty if non are found. +Using the class @code{EDID} it is possible to +parse the extended display identification data +of an output. @code{EDID} as a constructor that +takes one argument: the EDID as stored by +@code{Output} in its variable @code{edid}. +This class can only parse EDID structure revision +1.3, which is way all monitors produced 2000 or +later should use. If the supplied EDID does +not meet this requirement an exception will be +raised by the constructor. + +An instance of @code{EDID} currently have +the following variables: + +@table @code +@item widthmm +The physical width of the monitor, measured +in millimetres. @code{None} if not, e.g. a +projector. This value is between 10 mm and 2550 +mm inclusively and is always zero modulo 10 mm. + +@item heightmm +The physical height of the monitor, measured +in millimetres. @code{None} if not, e.g. a +projector. This value is @code{None} exactly +when the value of @code{widthmm} is @code{None}. +This value is between 10 mm and 2550 mm +inclusively and is always zero modulo 10 mm. + +@item gamma +The monitor's estimated gamma characteristics, +@code{None} if not specified. The range of this +value is 1,00 to 3,55 inclusively, with a +precision of 0,01. + +@item gamma_correction +The value correlates exactly with @code{gamma}, +and is @code{None} if and only if @code{gamma} +is @code{None}. More precisely, it is the value +of @code{gamma} divided by gamma calibrated +monitors should have: 2,2. This value can be +used for gamma correction if you do not have +more exact values to use. +@end table + + @node Backlight @section Backlight |