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Formula to determine brightness of RGB color
...ing for is the RGB -> Luma conversion formula.
Photometric/digital ITU BT.709:
Y = 0.2126 R + 0.7152 G + 0.0722 B
Digital ITU BT.601 (gives more weight to the R and B components):
Y = 0.299 R + 0.587 G + 0.114 B
If you are willing to trade accuracy for perfomance, there are two approximati...
Multiple commands in gdb separated by some sort of delimiter ';'?
...nt stacktrace of the invoker: execlp("gdb", "gdb", "-batch", "-n", "-ex", "bt full", ... and I can't turn off pagination.
– Vi.
Jun 30 '10 at 18:01
4
...
How do I analyze a program's core dump file with GDB when it has command-line parameters?
...se of the crash/fault.
Other command, for the same purposes is:
...
(gdb) bt full
This is the same as above. By convention, it lists the whole stack information (which ultimately leads to the crash location).
share
...
What is the smallest possible valid PDF?
...l-ish file with text content :
%PDF-1.2
9 0 obj
<<
>>
stream
BT/ 9 Tf(Test)' ET
endstream
endobj
4 0 obj
<<
/Type /Page
/Parent 5 0 R
/Contents 9 0 R
>>
endobj
5 0 obj
<<
/Kids [4 0 R ]
/Count 1
/Type /Pages
/MediaBox [ 0 0 99 9 ]
>>
endobj
3 0 obj
<<
/Pag...
Can I see changes before I save my file in Vim?
...=&ft
diffthis
vnew | r # | normal! 1Gdd
diffthis
exe "setlocal bt=nofile bh=wipe nobl noswf ro ft=" . filetype
endfunction
com! DiffSaved call s:DiffWithSaved()
To get out of diff view you can use the :diffoff command.
Below is a similar function, adapted to mimic the 'cvs dif...
How can one see content of stack with GDB?
...
Use:
bt - backtrace: show stack functions and args
info frame - show stack start/end/args/locals pointers
x/100x $sp - show stack memory
(gdb) bt
#0 zzz () at zzz.c:96
#1 0xf7d39cba in yyy (arg=arg@entry=0x0) at yyy.c:542
#2 ...
bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...的进程号和进程名信息。
12. 内核结构跟踪
# cat path.bt
#include <linux/path.h>
#include <linux/dcache.h>
kprobe:vfs_open
{
printf("open path: %s\n", str(((struct path *)arg0)->dentry->d_name.name));
}
# bpftrace path.bt
Attaching 1 probe...
open path: dev
open pa...
Determine the line of code that causes a segmentation fault?
...
You can also use ( bt full ) to get more details.
– ant2009
May 21 '10 at 3:37
...
Why is a boolean 1 byte and not 1 bit of size?
...
Actually, the four x86 instructions bt, bts, btr and btc can address single bits!
– fredoverflow
Jan 7 '11 at 16:07
...
How do I create a custom Error in JavaScript?
...
@BT How does the msg property on the new instance affect the msg property on this in Error.apply(this, arguments);? I'm saying the call to Error here is constructing a new object, which is thrown away; not initializing the al...