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#!/usr/bin/perl -w
# Copyright 2011, 2012 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 strict;
use X11::Protocol;
use lib 'devel', '.';
# uncomment this to run the ### lines
use Smart::Comments;
my $X = X11::Protocol->new (':0');
$X->{'event_handler'} = \&event_handler;
$X->init_extension('XFIXES') or die $@;
$X->init_extension('DAMAGE') or die $@;
$|=1;
my $root_x = 0;
my $root_y = 0;
my $width = 100;
my $height = 100;
my $origin = $X->root;
# my $origin = $X->new_rsrc;
# $X->CreateWindow ($origin,
# $X->root, # parent
# 'InputOutput',
# 0, # depth, from parent
# 'CopyFromParent', # visual
# 0,0, # x,y
# 20,20,
# 0, # border
# );
# $X->MapWindow ($origin);
my $origin_x = 1000;
my $origin_y = 0;
my $origin_region = $X->new_rsrc;
$X->XFixesCreateRegion ($origin_region, [$origin_x,$origin_y,10,10]);
my $parts = $X->new_rsrc;
$X->XFixesCreateRegion ($parts);
my $damage = $X->new_rsrc;
$X->DamageCreate ($damage, $origin, 'NonEmpty');
$X->QueryPointer ($X->{'root'});
my $window = $X->new_rsrc;
$X->CreateWindow ($window,
$X->root, # parent
'InputOutput',
0, # depth, from parent
'CopyFromParent', # visual
0,0, # x,y
$width,$height,
0, # border
background_pixel => $X->black_pixel,
event_mask => $X->pack_event_mask('Exposure','KeyPress'),
);
$X->MapWindow ($window);
my $gc;
my $want_freshen;
sub event_handler {
my (%h) = @_;
### event_handler: \%h
if ($h{'name'} eq 'ConfigureNotify') {
$width = $h{'width'};
$width = $h{'height'};
$want_freshen = 1;
} elsif ($h{'name'} eq 'DamageNotify') {
$want_freshen = 1;
} elsif ($h{'name'} eq 'Expose') {
expose();
}
};
sub freshen {
### freshen(): $damage, $parts
$X->DamageSubtract ($damage, 'None', $parts);
dump_region ($X,$parts,'damaged');
return if ! $window;
$X->XFixesIntersectRegion ($parts, $origin_region, $parts);
dump_region ($X,$parts,'intersected with origin');
my $window_region = $X->new_rsrc;
$X->XFixesCreateRegionFromWindow ($window_region, $window, 'Bounding');
dump_region ($X,$window_region,'own window');
my ($same_screen, $child, $x, $y)
= $X->TranslateCoordinates ($window, $X->root, 0,0);
### $x
### $y
$X->XFixesTranslateRegion ($window_region, $x, $y);
dump_region ($X,$window_region,'own window translated');
$X->XFixesSubtractRegion ($parts, $window_region, $parts);
$X->XFixesDestroyRegion ($window_region);
dump_region ($X,$parts,'subtracted own window');
# $X->XFixesSetGCClipRegion ($gc, $parts, 0,0);
my ($bounding, @rects) = $X->XFixesFetchRegion ($parts);
if ($bounding->[2] && $bounding->[3]) {
expose();
} else {
### no draw...
}
}
sub expose {
### expose...
if (! $gc) {
### make gc
$gc = $X->new_rsrc;
$X->CreateGC ($gc, $window, subwindow_mode => 'IncludeInferiors');
}
# $X->SetGCClipRegion ($gc, $parts, 0,0);
$X->CopyArea ($origin, $window, $gc,
$origin_x,$origin_y,
$width,$height,
0,0); # dst x,y
}
sub dump_region {
my ($X, $region, $name) = @_;
my @rects = $X->XFixesFetchRegion ($region);
if (! defined $name) { $name = ''; }
printf "region %X $name\n", $region;
if (@rects) {
foreach my $rect (@rects) {
print " ",join(',',@$rect),"\n";
}
} else {
print " empty";
}
}
sub fh_readable {
my ($fh) = @_;
require IO::Select;
my $s = IO::Select->new;
$s->add($fh);
my @ready = $s->can_read(1);
return scalar(@ready);
}
for (;;) {
if (fh_readable ($X->{'connection'}->fh)) {
### handle_input
$X->handle_input;
}
if ($want_freshen) {
$want_freshen = 0;
freshen();
}
# else {
# $X->handle_input;
# }
}
### exit
exit 0;
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