From 164c1ab8e8b2e6aeb5df1d12ed328efd45c7932d Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Tue, 3 Jun 2014 00:14:51 +0200 Subject: info: edid MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- info/libgamma.texinfo | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 64 insertions(+), 1 deletion(-) diff --git a/info/libgamma.texinfo b/info/libgamma.texinfo index ec1d383..a2aea74 100644 --- a/info/libgamma.texinfo +++ b/info/libgamma.texinfo @@ -943,7 +943,70 @@ Its possible values are: £>done @end table -Release resources that are held by a +The variable @code{edid} is in raw format. +To convert it to a human-readable format +you should convert it to hexadecimal +representation. To do this, you can call +either of the functions + +@table @code +@item libgamma_behex_edid +@itemx libgamma_behex_edid_lowercase +Converts to lowercase hexadecimal. + +@item libgamma_behex_edid_uppercase +Converts to uppercase hexadecimal. +@end table + +These functions return the EDID as +a hexadecimal NUL-terminated +non-@code{NULL} string of the data +type @code{char*}, which you should +free when you do not need it anymore. +If enough memory cannot be allocated +@code{NULL} is returned and +@code{errno} is set accordingly. + +These functions take two arguments: + +@table @asis +@item @code{edid} [@code{const unsigned char*}] +The EDID in raw representation. + +@item @code{length} [@code{size_t}] +The length of @code{edid}. +@end table + +The values of these arguments should +be the values of the variables +@code{edid} and @code{edid_length}, +respectively. + +If you want to identify a monitor by +it's EDID@footnote{EDID:s should be +unique and even if the manufacture +for the monitor has not made sure if +this it is very unlikely that it is +not.} it is more effective to convert +the EDID you want to raw format and +compare the raw format rather than +converting all monitors EDID to +hexadecimal representation. To do +this use the function +@code{libgamma_unhex_edid}. This +function takes the EDID in NUL-terminated +non-@code{NULL} hexadecimal +representation as a @code{const char*} +as its only argument. The function +returns the EDID in raw format as an +@code{unsigned char*}. The returned +value will be @code{NULL} if enough +memory for the output cannot be allocated +or if the input is a hexadecimal +representation of a byte array; +@code{errno} will be set accordingly. + +To release resources that are held by a @code{libgamma_crtc_information_t*} whose variables have been set by @code{libgamma_get_crtc_information} -- cgit v1.2.3-70-g09d2