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|
#!/usr/bin/perl -w
# Copyright 2014 Kevin Ryde
# This file is part of X11-Protocol-Other.
#
# X11-Protocol-Other is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as published
# by the Free Software Foundation; either version 3, or (at your option) any
# later version.
#
# X11-Protocol-Other is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with X11-Protocol-Other. If not, see <http://www.gnu.org/licenses/>.
use Smart::Comments;
{
require X11::Protocol;
my $X = X11::Protocol->new;
my $visual_id = 0x41;
### vis: $X->{'visuals'}->{$visual_id}
my $colormap = $X->new_rsrc;
$X->CreateColormap ($colormap, $visual_id, $X->root, 'None');
$X->QueryPointer($X->{'root'}); # sync
my $depth = $X->{'visuals'}->{$visual_id}->{'depth'};
# $depth = 24;
### $depth
my $window = $X->new_rsrc;
$X->CreateWindow ($window,
$X->root, # parent
'InputOutput', # class
$depth, # depth
$visual_id, # visual ID
0,0, # x,y
100,100, # w,h initial size
0, # border
colormap => $colormap,
# background_pixel => $X->white_pixel,
background_pixmap => 0,
border_pixmap => 0,
# event_mask => $X->pack_event_mask('Exposure'),
);
$X->QueryPointer($X->{'root'}); # sync
$X->MapWindow ($window);
$X->QueryPointer($X->{'root'}); # sync
for (;;) { $X->handle_input; }
exit;
}
{
#!/usr/bin/perl -w
use strict;
use X11::Protocol;
# Return a list of three values ($red, $green, $blue) each 16-bits 0 to
# 0xFFFF which is the colour at $root_x,$root_y on the given $root window.
# $root must be a root window. $root_x,$root_y must be within its
# width,height.
#
# The pixel is read from the top-most window at $root_x,$root_y rather
# than from the root. This is since it's possible, at least in principle,
# for a child window to have a different depth than its parent. Using the
# colormap from the window ensures the colour fetched is what the window
# intends to display, even if the currently installed colormap is
# something different.
#
sub rgb_at_root_xy {
my ($X, $root, $root_x,$root_y) = @_;
# It would be prudent to grab the server to prevent window changes
# occurring while we fetch. X11::Protocol::GrabServer would be one way
# to do that.
# my $grab = X11::Protocol::GrabServer->new($X);
# the window at $root_x,$root_y
(undef, my $window)
= $X->TranslateCoordinates($root, $root, $root_x,$root_y);
if ($window eq 'None') {
$window = $root; # root window if nothing else at $x,$y
}
# window-relative coordinates
my (undef, undef, $win_x,$win_y)
= $X->TranslateCoordinates($root, $window, $root_x,$root_y);
my ($depth, $visual, $pixel_bytes)
= $X->GetImage($window, $win_x,$win_y, 1,1, 0xFFFF_FFFF, 'ZPixmap');
# ensure $pixel_bytes is big-endian
if ($X->interp('Significance', $X->{'image_byte_order'})
eq 'LeastSignificant') {
$pixel_bytes = reverse $pixel_bytes;
}
my $pixel = unpack 'N', $pixel_bytes;
# mask out any bits above $depth
$pixel &= (1 << $depth) - 1;
# lookup $pixel in the window's colormap
my %attrs = $X->GetWindowAttributes ($window);
my ($rgb_aref) = $X->QueryColors ($attrs{'colormap'}, $pixel);
return @$rgb_aref;
}
my $X = X11::Protocol->new;
my %pointer = $X->QueryPointer($X->root);
my $root = $pointer{'root'}; # root window containing mouse
my $root_x = $pointer{'root_x'}; # X,Y location
my $root_y = $pointer{'root_y'};
print "pixel at $root_x,$root_y\n";
my ($red, $green, $blue) = rgb_at_root_xy($X, $root, $root_x,$root_y);
printf "RGB 4-digit hexadecimal #%04X%04X%04X\n", $red, $green, $blue;
exit 0;
}
{
# Xnest -scrns 2 :1
$ENV{'DISPLAY'} ||= ":1.0";
require IPC::Run;
require File::Spec;
IPC::Run::start(['Xnest',
'-scrns','2',
'-geometry','300x100+900+20',
# '-geometry','300x100+900+150',
':1'],
'<', File::Spec->devnull);
sleep 1;
IPC::Run::start(['xclock',
'-display',':1.0'],
'<', File::Spec->devnull);
IPC::Run::start(['xterm', '-display',':1.1', '-geometry','30x5'],
'<', File::Spec->devnull);
require X11::Protocol;
my $X = X11::Protocol->new (":1.1");
print "vendor $X->{'vendor'}\n";
printf "root %X\n", $X->root;
printf "root 0 %X\n", $X->screens->[0]->{'root'};
printf "root 1 %X\n", $X->screens->[1]->{'root'};
{
my %pointer = $X->QueryPointer($X->root);
printf "pointer root %X\n", $pointer{'root'};
}
my $prev = '';
for (;;) {
sleep 1;
my %pointer = $X->QueryPointer($X->root);
my ($red, $green, $blue) = rgb_at_root_xy($X, $pointer{'root'},
$pointer{'root_x'}, $pointer{'root_y'});
my $str = sprintf "%d,%d is #%04X%04X%04X\n",
$pointer{'root_x'}, $pointer{'root_y'}, $red, $green, $blue;
if ($str ne $prev) {
$prev = $str;
print $str;
}
}
exit 0;
}
# ### $colormap
# ### pixel: sprintf '%X', $pixel
use Time::HiRes 'usleep';
sleep 1;
goto MORE;
exit 0;
# uncomment this to run the ### lines
use Smart::Comments;
# mouse pointer location and top-most window
# (if fetching from an arbitrary X,Y rather than QueryPointer() then would
# do $X->TranslateCoordinates() to find the window at that X,Y)
#
# If getting the pixel at an arbitrary $x,$y then the window at $x,$y could
# be found with $X->TranslateCoordinates().
# my ($same_screen, $window)
# = $X->TranslateCoordinates($X->root, $X->root, $x,$y);
# my $visual_info = $X->{'visuals'}->{$visual_id}
# || die "Oops, Unknown visual ID $visual_id";
# my $visual_class = $visual_info->{'class'};
# my $visual_class_is_dynamic = ($X->num('VisualClass',$visual_class) & 1);
#
# if ($visual_class_is_dynamic) {
#
# }
# return $pixel;
|
