[ViewVC] Annotation of: cvs/rxvt-unicode/src/perl/background

#! perl

#:META:X_RESOURCE:%.expr:string:background expression
#:META:X_RESOURCE:%.enable:boolean:some boolean
#:META:X_RESOURCE:%.extra.:value:extra config

our $EXPR = 'move X, Y, load "MagnoliaAlpha.png"';
#$EXPR = '
#   rotate W, H, 50, 50, counter 1/59.95, repeat_mirror,
#   clip X, Y, W, H, repeat_mirror,
#   load "/root/pix/das_fette_schwein.jpg"
#';
#$EXPR = 'solid "red"';
#$EXPR = 'blur root, 10, 10'
#$EXPR = 'blur move (root, -x, -y), 5, 5'
#resize load "/root/pix/das_fette_schwein.jpg", w, h

use Safe;

our ($bgdsl_self, $old, $new);
our ($l, $t, $w, $h);

# enforce at least this interval between updates
our $MIN_INTERVAL = 1/100;

{
   package urxvt::bgdsl; # background language

#   *repeat_empty  = \&urxvt::RepeatNone;
#   *repeat_tile   = \&urxvt::RepeatNormal;
#   *repeat_pad    = \&urxvt::RepeatPad;
#   *repeat_mirror = \&urxvt::RepeatReflect;

=head2 PROVIDERS/GENERATORS

=over 4

=item load $path

=cut

   sub load($) {
      my ($path) = @_;

      $new->{load}{$path} = $old->{load}{$path} || $bgdsl_self->new_img_from_file ($path);
   }

   sub root() {
      $new->{rootpmap_sensitive} = 1;
      die "root op not supported, exg, we need you";
   }

   sub solid($;$$) {
      my $img = $bgdsl_self->new_img (urxvt::PictStandardARGB32, $_[1] || 1, $_[2] || 1);
      $img->fill ($_[0]);
      $img
   }

=back

=head2 VARIABLES

=over 4

=cut

   sub X() { $new->{position_sensitive} = 1; $l }
   sub Y() { $new->{position_sensitive} = 1; $t }
   sub W() { $new->{size_sensitive}     = 1; $w }
   sub H() { $new->{size_sensitive}     = 1; $h }

   sub now() { urxvt::NOW }

   sub again($) {
      $new->{again} = $_[0];
   }

   sub counter($) {
      $new->{again} = $_[0];
      $bgdsl_self->{counter} + 0
   }

=back

=head2 OPERATORS

=over 4

=cut

#   sub clone($) {
#      $_[0]->clone
#   }

   sub clip($;$$;$$) {
      my $img = pop;
      $img->sub_rect ($_[0], $_[1], $_[2] || W, $_[3] || H)
   }

   sub resize($$$) {
      my $img = pop;
      $img->scale ($_[0], $_[1])
   }

   # TODO: ugly
   sub move($$;$) {
      my $img = pop->clone;
      $img->move ($_[0], $_[1]);
      $img
#      my $img = pop;
#      $img->sub_rect (
#         $_[0], $_[1],
#         $img->w, $img->h,
#         $_[2],
#      )
   }

   sub rotate($$$$$$) {
      my $img = pop;
      $img->rotate (
         $_[0],
         $_[1],
         $_[2] * $img->w * .01,
         $_[3] * $img->h * .01,
         $_[4] * (3.14159265 / 180),
      )
   }

   sub blur($$$) {
      my ($rh, $rv, $img) = @_;

      $img->blur ($rh, $rv);
   }

   sub contrast($$;$$;$) {
      my $img = pop;
      my ($r, $g, $b, $a) = @_;

      ($g, $b) = ($r, $r) if @_ < 4;
      $a       = 1        if @_ < 5;

      $img = $img->clone;
      $img->contrast ($r, $g, $b, $a);
      $img
   }

   sub brightness($$;$$;$) {
      my $img = pop;
      my ($r, $g, $b, $a) = @_;

      ($g, $b) = ($r, $r) if @_ < 4;
      $a       = 1        if @_ < 5;

      $img = $img->clone;
      $img->brightness ($r, $g, $b, $a);
      $img
   }

=back

=cut

}

sub parse_expr {
   my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}";
   die if $@;
   $expr
}

# compiles a parsed expression
sub set_expr {
   my ($self, $expr) = @_;

   $self->{expr} = $expr;
   $self->recalculate;
}

# evaluate the current bg expression
sub recalculate {
   my ($self) = @_;

   # rate limit evaluation

   if ($self->{next_refresh} > urxvt::NOW) {
      $self->{next_refresh_timer} = urxvt::timer->new->after ($self->{next_refresh} - urxvt::NOW)->cb (sub {
         $self->recalculate;
      });
      return;
   }

   $self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;

   # set environment to evaluate user expression

   local $bgdsl_self = $self;

   local $old = $self->{state};
   local $new = my $state = $self->{state} = {};

   ($l, $t, $w, $h) =
      $self->get_geometry;

   # evaluate user expression

   my $img = eval { $self->{expr}->() };
   warn $@ if $@;#d#
   die if !UNIVERSAL::isa $img, "urxvt::img";

   # if the expression is sensitive to external events, prepare reevaluation then

   my $repeat;

   if (my $again = $state->{again}) {
      $repeat = 1;
      $state->{timer} = $again == $old->{again}
                        ? $old->{timer}
                        : urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
                             ++$self->{counter};
                             $self->recalculate
                          });
   }

   if (delete $state->{position_sensitive}) {
      $repeat = 1;
      $self->enable (position_change => sub { $_[0]->recalculate });
   } else {
      $self->disable ("position_change");
   }

   if (delete $state->{size_sensitive}) {
      $repeat = 1;
      $self->enable (size_change => sub { $_[0]->recalculate });
   } else {
      $self->disable ("size_change");
   }

   if (delete $state->{rootpmap_sensitive}) {
      $repeat = 1;
      $self->enable (rootpmap_change => sub { $_[0]->recalculate });
   } else {
      $self->disable ("rootpmap_change");
   }

   # clear stuff we no longer need

   %$old = ();

   unless ($repeat) {
      delete $self->{state};
      delete $self->{expr};
   }

   # prepare and set background pixmap

   $img = $img->sub_rect (0, 0, $w, $h)
      if $img->w != $w || $img->h != $h;

   $self->set_background ($img);
   $self->scr_recolour (0);
   $self->want_refresh;
}

sub on_start {
   my ($self) = @_;

   $self->set_expr (parse_expr $EXPR);

   ()
}

Revision:	1.20
Committed:	Wed Jun 6 22:01:45 2012 UTC (11 years, 11 months ago) by root
Branch:	MAIN
Changes since 1.19:	+40 -30 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#! perl
2
3	root	1.16	#:META:X_RESOURCE:%.expr:string:background expression
4			#:META:X_RESOURCE:%.enable:boolean:some boolean
5	root	1.18	#:META:X_RESOURCE:%.extra.:value:extra config
6	root	1.12
7	root	1.19	our $EXPR = 'move X, Y, load "MagnoliaAlpha.png"';
8			#$EXPR = '
9			# rotate W, H, 50, 50, counter 1/59.95, repeat_mirror,
10			# clip X, Y, W, H, repeat_mirror,
11			# load "/root/pix/das_fette_schwein.jpg"
12			#';
13			#$EXPR = 'solid "red"';
14	root	1.1	#$EXPR = 'blur root, 10, 10'
15			#$EXPR = 'blur move (root, -x, -y), 5, 5'
16			#resize load "/root/pix/das_fette_schwein.jpg", w, h
17
18			use Safe;
19
20	root	1.3	our ($bgdsl_self, $old, $new);
21			our ($l, $t, $w, $h);
22
23	root	1.16	# enforce at least this interval between updates
24	root	1.10	our $MIN_INTERVAL = 1/100;
25	root	1.9
26	root	1.1	{
27			package urxvt::bgdsl; # background language
28
29	root	1.20	# *repeat_empty = \&urxvt::RepeatNone;
30			# *repeat_tile = \&urxvt::RepeatNormal;
31			# *repeat_pad = \&urxvt::RepeatPad;
32			# *repeat_mirror = \&urxvt::RepeatReflect;
33	root	1.1
34	root	1.15	=head2 PROVIDERS/GENERATORS
35
36			=over 4
37
38			=item load $path
39
40			=cut
41
42	root	1.2	sub load($) {
43	root	1.1	my ($path) = @_;
44
45	root	1.3	$new->{load}{$path} = $old->{load}{$path} \|\| $bgdsl_self->new_img_from_file ($path);
46	root	1.1	}
47
48	root	1.2	sub root() {
49	root	1.9	$new->{rootpmap_sensitive} = 1;
50	root	1.1	die "root op not supported, exg, we need you";
51			}
52
53	root	1.15	sub solid($;$$) {
54			my $img = $bgdsl_self->new_img (urxvt::PictStandardARGB32, $_[1] \|\| 1, $_[2] \|\| 1);
55			$img->fill ($_[0]);
56			$img
57			}
58
59			=back
60
61	root	1.20	=head2 VARIABLES
62
63			=over 4
64
65			=cut
66
67			sub X() { $new->{position_sensitive} = 1; $l }
68			sub Y() { $new->{position_sensitive} = 1; $t }
69			sub W() { $new->{size_sensitive} = 1; $w }
70			sub H() { $new->{size_sensitive} = 1; $h }
71
72			sub now() { urxvt::NOW }
73
74			sub again($) {
75			$new->{again} = $_[0];
76			}
77
78			sub counter($) {
79			$new->{again} = $_[0];
80			$bgdsl_self->{counter} + 0
81			}
82
83			=back
84
85	root	1.15	=head2 OPERATORS
86
87			=over 4
88
89			=cut
90
91	root	1.4	# sub clone($) {
92			# $_[0]->clone
93			# }
94
95	root	1.20	sub clip($;$$;$$) {
96	root	1.7	my $img = pop;
97	root	1.20	$img->sub_rect ($_[0], $_[1], $_[2] \|\| W, $_[3] \|\| H)
98	root	1.4	}
99
100	root	1.2	sub resize($$$) {
101	root	1.7	my $img = pop;
102			$img->scale ($_[0], $_[1])
103	root	1.1	}
104
105	root	1.7	# TODO: ugly
106			sub move($$;$) {
107	root	1.20	my $img = pop->clone;
108			$img->move ($_[0], $_[1]);
109			$img
110			# my $img = pop;
111			# $img->sub_rect (
112			# $_[0], $_[1],
113			# $img->w, $img->h,
114			# $_[2],
115			# )
116	root	1.1	}
117
118	root	1.20	sub rotate($$$$$$) {
119	root	1.7	my $img = pop;
120			$img->rotate (
121			$_[0],
122	root	1.4	$_[1],
123	root	1.7	$_[2] * $img->w * .01,
124			$_[3] * $img->h * .01,
125			$_[4] * (3.14159265 / 180),
126	root	1.4	)
127	root	1.1	}
128
129	root	1.2	sub blur($$$) {
130	root	1.7	my ($rh, $rv, $img) = @_;
131	root	1.1
132	root	1.4	$img->blur ($rh, $rv);
133	root	1.1	}
134
135	root	1.2	sub contrast($$;$$;$) {
136	root	1.7	my $img = pop;
137			my ($r, $g, $b, $a) = @_;
138	root	1.4
139	root	1.1	($g, $b) = ($r, $r) if @_ < 4;
140			$a = 1 if @_ < 5;
141	root	1.4
142	root	1.1	$img = $img->clone;
143			$img->contrast ($r, $g, $b, $a);
144			$img
145			}
146
147	root	1.2	sub brightness($$;$$;$) {
148	root	1.7	my $img = pop;
149			my ($r, $g, $b, $a) = @_;
150	root	1.4
151	root	1.1	($g, $b) = ($r, $r) if @_ < 4;
152			$a = 1 if @_ < 5;
153	root	1.4
154	root	1.1	$img = $img->clone;
155			$img->brightness ($r, $g, $b, $a);
156			$img
157			}
158
159	root	1.15	=back
160
161			=cut
162
163	root	1.1	}
164
165			sub parse_expr {
166			my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}";
167			die if $@;
168			$expr
169			}
170
171			# compiles a parsed expression
172			sub set_expr {
173			my ($self, $expr) = @_;
174
175			$self->{expr} = $expr;
176			$self->recalculate;
177			}
178
179			# evaluate the current bg expression
180			sub recalculate {
181			my ($self) = @_;
182
183	root	1.10	# rate limit evaluation
184
185	root	1.9	if ($self->{next_refresh} > urxvt::NOW) {
186			$self->{next_refresh_timer} = urxvt::timer->new->after ($self->{next_refresh} - urxvt::NOW)->cb (sub {
187			$self->recalculate;
188			});
189	root	1.12	return;
190	root	1.9	}
191
192			$self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;
193
194	root	1.10	# set environment to evaluate user expression
195	root	1.6
196	root	1.3	local $bgdsl_self = $self;
197	root	1.1
198	root	1.3	local $old = $self->{state};
199			local $new = my $state = $self->{state} = {};
200	root	1.1
201	root	1.3	($l, $t, $w, $h) =
202	root	1.1	$self->get_geometry;
203
204	root	1.10	# evaluate user expression
205
206	root	1.1	my $img = eval { $self->{expr}->() };
207			warn $@ if $@;#d#
208	root	1.15	die if !UNIVERSAL::isa $img, "urxvt::img";
209	root	1.1
210	root	1.10	# if the expression is sensitive to external events, prepare reevaluation then
211
212	root	1.2	my $repeat;
213
214	root	1.1	if (my $again = $state->{again}) {
215	root	1.2	$repeat = 1;
216	root	1.6	$state->{timer} = $again == $old->{again}
217			? $old->{timer}
218	root	1.7	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
219			++$self->{counter};
220			$self->recalculate
221			});
222	root	1.1	}
223
224	root	1.2	if (delete $state->{position_sensitive}) {
225			$repeat = 1;
226			$self->enable (position_change => sub { $_[0]->recalculate });
227			} else {
228			$self->disable ("position_change");
229			}
230
231			if (delete $state->{size_sensitive}) {
232			$repeat = 1;
233			$self->enable (size_change => sub { $_[0]->recalculate });
234			} else {
235			$self->disable ("size_change");
236			}
237
238	root	1.9	if (delete $state->{rootpmap_sensitive}) {
239			$repeat = 1;
240			$self->enable (rootpmap_change => sub { $_[0]->recalculate });
241			} else {
242			$self->disable ("rootpmap_change");
243			}
244
245	root	1.10	# clear stuff we no longer need
246
247	root	1.6	%$old = ();
248
249	root	1.5	unless ($repeat) {
250			delete $self->{state};
251			delete $self->{expr};
252			}
253
254	root	1.10	# prepare and set background pixmap
255
256	root	1.4	$img = $img->sub_rect (0, 0, $w, $h)
257			if $img->w != $w \|\| $img->h != $h;
258	root	1.1
259			$self->set_background ($img);
260			$self->scr_recolour (0);
261			$self->want_refresh;
262			}
263
264			sub on_start {
265			my ($self) = @_;
266
267			$self->set_expr (parse_expr $EXPR);
268
269			()
270			}
271