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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.44 by root, Sun Jun 10 11:31:22 2012 UTC vs.
Revision 1.55 by root, Thu Jun 14 16:48:57 2012 UTC

…		…
1	#! perl	1	#! perl
2		2
3	#:META:X_RESOURCE:%.expr:string:background expression	3	#:META:X_RESOURCE:%.expr:string:background expression
4	#:META:X_RESOURCE:%.border.:boolean:respect the terminal border	4	#:META:X_RESOURCE:%.border:boolean:respect the terminal border
5		5	#:META:X_RESOURCE:%.interval:seconds:minimum time between updates
6	#TODO: once, rootalign
7		6
8	=head1 NAME	7	=head1 NAME
9		8
10	background - manage terminal background	9	background - manage terminal background
11		10
12	=head1 SYNOPSIS	11	=head1 SYNOPSIS
13		12
14	urxvt --background-expr 'background expression'	13	urxvt --background-expr 'background expression'
15	--background-border	14	--background-border
		15	--background-interval seconds
16		16
17	=head1 DESCRIPTION	17	=head1 DESCRIPTION
18		18
19	This extension manages the terminal background by creating a picture that	19	This extension manages the terminal background by creating a picture that
20	is behind the text, replacing the normal background colour.	20	is behind the text, replacing the normal background colour.
57		57
58	For example, an expression such as C<scale load "$HOME/mybg.png"> scales the	58	For example, an expression such as C<scale load "$HOME/mybg.png"> scales the
59	image to the window size, so it relies on the window size and will	59	image to the window size, so it relies on the window size and will
60	be reevaluated each time it is changed, but not when it moves for	60	be reevaluated each time it is changed, but not when it moves for
61	example. That ensures that the picture always fills the terminal, even	61	example. That ensures that the picture always fills the terminal, even
62	after it's size changes.	62	after its size changes.
63		63
64	=head2 EXPRESSIONS	64	=head2 EXPRESSIONS
65		65
66	Expressions are normal Perl expressions, in fact, they are Perl blocks -	66	Expressions are normal Perl expressions, in fact, they are Perl blocks -
67	which means you could use multiple lines and statements:	67	which means you could use multiple lines and statements:
…		…
71	return scale load "$HOME/weekday.png";	71	return scale load "$HOME/weekday.png";
72	} else {	72	} else {
73	return scale load "$HOME/sunday.png";	73	return scale load "$HOME/sunday.png";
74	}	74	}
75		75
76	This expression gets evaluated once per hour. It will set F<sunday.png> as	76	This expression is evaluated once per hour. It will set F<sunday.png> as
77	background on Sundays, and F<weekday.png> on all other days.	77	background on Sundays, and F<weekday.png> on all other days.
78		78
79	Fortunately, we expect that most expressions will be much simpler, with	79	Fortunately, we expect that most expressions will be much simpler, with
80	little Perl knowledge needed.	80	little Perl knowledge needed.
81		81
…		…
115	horizontal and vertical dimensions. For example, this halves the image	115	horizontal and vertical dimensions. For example, this halves the image
116	width and doubles the image height:	116	width and doubles the image height:
117		117
118	scale 0.5, 2, load "$HOME/mypic.png"	118	scale 0.5, 2, load "$HOME/mypic.png"
119		119
120	Other effects than scalign are also readily available, for exmaple, you can	120	Other effects than scaling are also readily available, for example, you can
121	tile the image to fill the whole window, instead of resizing it:	121	tile the image to fill the whole window, instead of resizing it:
122		122
123	tile load "$HOME/mypic.png"	123	tile load "$HOME/mypic.png"
124		124
125	In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator	125	In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator
…		…
151	This only works for one cycle though, so as long as you load the same	151	This only works for one cycle though, so as long as you load the same
152	image every time, it will always be cached, but when you load a different	152	image every time, it will always be cached, but when you load a different
153	image, it will forget about the first one.	153	image, it will forget about the first one.
154		154
155	This allows you to either speed things up by keeping multiple images in	155	This allows you to either speed things up by keeping multiple images in
156	memory, or comserve memory by loading images more often.	156	memory, or conserve memory by loading images more often.
157		157
158	For example, you can keep two images in memory and use a random one like	158	For example, you can keep two images in memory and use a random one like
159	this:	159	this:
160		160
161	my $img1 = load "img1.png";	161	my $img1 = load "img1.png";
…		…
189	overwriting borders and any other areas, such as the scrollbar.	189	overwriting borders and any other areas, such as the scrollbar.
190		190
191	Specifying this flag changes the behaviour, so that the image only	191	Specifying this flag changes the behaviour, so that the image only
192	replaces the background of the character area.	192	replaces the background of the character area.
193		193
		194	=item --background-interval seconds
		195
		196	Since some operations in the underlying XRender extension can effectively
		197	freeze your X-server for prolonged time, this extension enforces a minimum
		198	time between updates, which is normally about 0.1 seconds.
		199
		200	If you want to do updates more often, you can decrease this safety
		201	interval with this switch.
		202
194	=back	203	=back
195		204
196	=cut	205	=cut
197		206
		207	our %_IMG_CACHE;
198	our $HOME;	208	our $HOME;
199	our ($self, $old, $new);	209	our ($self, $old, $new);
200	our ($x, $y, $w, $h);	210	our ($x, $y, $w, $h);
201		211
202	# enforce at least this interval between updates	212	# enforce at least this interval between updates
203	our $MIN_INTERVAL = 1/100;	213	our $MIN_INTERVAL = 6/59.951;
204		214
205	{	215	{
206	package urxvt::bgdsl; # background language	216	package urxvt::bgdsl; # background language
207		217
208	use List::Util qw(min max sum shuffle);	218	use List::Util qw(min max sum shuffle);
…		…
218	=item load $path	228	=item load $path
219		229
220	Loads the image at the given C<$path>. The image is set to plane tiling	230	Loads the image at the given C<$path>. The image is set to plane tiling
221	mode.	231	mode.
222		232
223	Loaded images will be cached for one cycle.	233	Loaded images will be cached for one cycle, and shared between temrinals
		234	running in the same process (e.g. in C<urxvtd>).
224		235
		236	=item load_uc $path
		237
		238	Load uncached - same as load, but does not cache the image. This function
		239	is most useufl if you want to optimise a background expression in some
		240	way.
		241
225	=cut	242	=cut
		243
		244	sub load_uc($) {
		245	my ($path) = @_;
		246
		247	$_IMG_CACHE{$path} \|\| do {
		248	my $img = $self->new_img_from_file ($path);
		249	Scalar::Util::weaken ($_IMG_CACHE{$path} = $img);
		250	$img
		251	}
		252	}
226		253
227	sub load($) {	254	sub load($) {
228	my ($path) = @_;	255	my ($path) = @_;
229		256
230	$new->{load}{$path} = $old->{load}{$path} \|\| $self->new_img_from_file ($path);	257	$new->{load}{$path} = $old->{load}{$path} \|\| load_uc $path;
231	}	258	}
232		259
233	=item root	260	=item root
234		261
235	Returns the root window pixmap, that is, hopefully, the background image	262	Returns the root window pixmap, that is, hopefully, the background image
…		…
239	reevaluated when the bg image changes.	266	reevaluated when the bg image changes.
240		267
241	=cut	268	=cut
242		269
243	sub root() {	270	sub root() {
244	$new->{rootpmap_sensitive} = 1;	271	$new->{again}{rootpmap} = 1;
245	die "root op not supported, exg, we need you";	272	$self->new_img_from_root
246	}	273	}
247		274
248	=item solid $colour	275	=item solid $colour
249		276
250	=item solid $width, $height, $colour	277	=item solid $width, $height, $colour
…		…
263	my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] \|\| 1, $_[1] \|\| 1);	290	my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] \|\| 1, $_[1] \|\| 1);
264	$img->fill ($colour);	291	$img->fill ($colour);
265	$img	292	$img
266	}	293	}
267		294
268	=back	295	=item clone $img
269		296
270	=head2 VARIABLES	297	Returns an exact copy of the image. This is useful if you want to have
		298	multiple copies of the same image to apply different effects to.
271		299
272	The following functions provide variable data such as the terminal window
273	dimensions. They are not (Perl-) variables, they jsut return stuff that
274	varies. Most of them make your expression sensitive to some events, for
275	example using C<TW> (terminal width) means your expression is evaluated
276	again when the terminal is resized.
277
278	=over 4
279
280	=item TX
281
282	=item TY
283
284	Return the X and Y coordinates of the terminal window (the terminal
285	window is the full window by default, and the character area only when in
286	border-respect mode).
287
288	Using these functions make your expression sensitive to window moves.
289
290	These functions are mainly useful to align images to the root window.
291
292	Example: load an image and align it so it looks as if anchored to the
293	background.
294
295	move -TX, -TY, load "mybg.png"
296
297	=item TW
298
299	Return the width (C<TW>) and height (C<TH>) of the terminal window (the
300	terminal window is the full window by default, and the character area only
301	when in border-respect mode).
302
303	Using these functions make your expression sensitive to window resizes.
304
305	These functions are mainly useful to scale images, or to clip images to
306	the window size to conserve memory.
307
308	Example: take the screen background, clip it to the window size, blur it a
309	bit, align it to the window position and use it as background.
310
311	clip move -TX, -TY, blur 5, root
312
313	=cut	300	=cut
314		301
315	sub TX() { $new->{position_sensitive} = 1; $x }
316	sub TY() { $new->{position_sensitive} = 1; $y }
317	sub TW() { $new->{size_sensitive} = 1; $w }
318	sub TH() { $new->{size_sensitive} = 1; $h }
319
320	=item now
321
322	Returns the current time as (fractional) seconds since the epoch.
323
324	Using this expression does I<not> make your expression sensitive to time,
325	but the next two functions do.
326
327	=item again $seconds
328
329	When this function is used the expression will be reevaluated again in
330	C<$seconds> seconds.
331
332	Example: load some image and rotate it according to the time of day (as if it were
333	the hour pointer of a clock). Update this image every minute.
334
335	again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"
336
337	=item counter $seconds
338
339	Like C<again>, but also returns an increasing counter value, starting at
340	0, which might be useful for some simple animation effects.
341
342	=cut
343
344	sub now() { urxvt::NOW }
345
346	sub again($) {
347	$new->{again} = $_[0];
348	}
349
350	sub counter($) {	302	sub clone($) {
351	$new->{again} = $_[0];	303	$_[0]->clone
352	$self->{counter} + 0
353	}	304	}
354
355	=back
356		305
357	=head2 TILING MODES	306	=head2 TILING MODES
358		307
359	The following operators modify the tiling mode of an image, that is, the	308	The following operators modify the tiling mode of an image, that is, the
360	way that pixels outside the image area are painted when the image is used.	309	way that pixels outside the image area are painted when the image is used.
…		…
390	become transparent. This mode is most useful when you want to place an	339	become transparent. This mode is most useful when you want to place an
391	image over another image or the background colour while leaving all	340	image over another image or the background colour while leaving all
392	background pixels outside the image unchanged.	341	background pixels outside the image unchanged.
393		342
394	Example: load an image and display it in the upper left corner. The rest	343	Example: load an image and display it in the upper left corner. The rest
395	of the space is left "empty" (transparent or wahtever your compisotr does	344	of the space is left "empty" (transparent or whatever your compositor does
396	in alpha mode, else background colour).	345	in alpha mode, else background colour).
397		346
398	pad load "mybg.png"	347	pad load "mybg.png"
399		348
400	=item extend $img	349	=item extend $img
401		350
402	Extends the image over the whole plane, using the closest pixel in the	351	Extends the image over the whole plane, using the closest pixel in the
403	area outside the image. This mode is mostly useful when you more complex	352	area outside the image. This mode is mostly useful when you use more complex
404	filtering operations and want the pixels outside the image to have the	353	filtering operations and want the pixels outside the image to have the
405	same values as the pixels near the edge.	354	same values as the pixels near the edge.
406		355
407	Example: just for curiosity, how does this pixel extension stuff work?	356	Example: just for curiosity, how does this pixel extension stuff work?
408		357
…		…
434	$img	383	$img
435	}	384	}
436		385
437	=back	386	=back
438		387
439	=head2 PIXEL OPERATORS	388	=head2 VARIABLE VALUES
440		389
441	The following operators modify the image pixels in various ways.	390	The following functions provide variable data such as the terminal window
		391	dimensions. They are not (Perl-) variables, they just return stuff that
		392	varies. Most of them make your expression sensitive to some events, for
		393	example using C<TW> (terminal width) means your expression is evaluated
		394	again when the terminal is resized.
442		395
443	=over 4	396	=over 4
444		397
445	=item clone $img	398	=item TX
446		399
447	Returns an exact copy of the image.	400	=item TY
448		401
449	=cut	402	Return the X and Y coordinates of the terminal window (the terminal
		403	window is the full window by default, and the character area only when in
		404	border-respect mode).
450		405
		406	Using these functions make your expression sensitive to window moves.
		407
		408	These functions are mainly useful to align images to the root window.
		409
		410	Example: load an image and align it so it looks as if anchored to the
		411	background.
		412
		413	move -TX, -TY, load "mybg.png"
		414
		415	=item TW
		416
		417	Return the width (C<TW>) and height (C<TH>) of the terminal window (the
		418	terminal window is the full window by default, and the character area only
		419	when in border-respect mode).
		420
		421	Using these functions make your expression sensitive to window resizes.
		422
		423	These functions are mainly useful to scale images, or to clip images to
		424	the window size to conserve memory.
		425
		426	Example: take the screen background, clip it to the window size, blur it a
		427	bit, align it to the window position and use it as background.
		428
		429	clip move -TX, -TY, once { blur 5, root }
		430
		431	=cut
		432
		433	sub TX() { $new->{again}{position} = 1; $x }
		434	sub TY() { $new->{again}{position} = 1; $y }
		435	sub TW() { $new->{again}{size} = 1; $w }
		436	sub TH() { $new->{again}{size} = 1; $h }
		437
		438	=item now
		439
		440	Returns the current time as (fractional) seconds since the epoch.
		441
		442	Using this expression does I<not> make your expression sensitive to time,
		443	but the next two functions do.
		444
		445	=item again $seconds
		446
		447	When this function is used the expression will be reevaluated again in
		448	C<$seconds> seconds.
		449
		450	Example: load some image and rotate it according to the time of day (as if it were
		451	the hour pointer of a clock). Update this image every minute.
		452
		453	again 60; rotate 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"
		454
		455	=item counter $seconds
		456
		457	Like C<again>, but also returns an increasing counter value, starting at
		458	0, which might be useful for some simple animation effects.
		459
		460	=cut
		461
		462	sub now() { urxvt::NOW }
		463
		464	sub again($) {
		465	$new->{again}{time} = $_[0];
		466	}
		467
451	sub clone($) {	468	sub counter($) {
452	$_[0]->clone	469	$new->{again}{time} = $_[0];
		470	$self->{counter} + 0
453	}	471	}
		472
		473	=back
		474
		475	=head2 SHAPE CHANGING OPERATORS
		476
		477	The following operators modify the shape, size or position of the image.
		478
		479	=over 4
454		480
455	=item clip $img	481	=item clip $img
456		482
457	=item clip $width, $height, $img	483	=item clip $width, $height, $img
458		484
…		…
552		578
553	Example: move the image right by 20 pixels and down by 30.	579	Example: move the image right by 20 pixels and down by 30.
554		580
555	move 20, 30, ...	581	move 20, 30, ...
556		582
		583	=item align $xalign, $yalign, $img
		584
		585	Aligns the image according to a factor - C<0> means the image is moved to
		586	the left or top edge (for C<$xalign> or C<$yalign>), C<0.5> means it is
		587	exactly centered and C<1> means it touches the right or bottom edge.
		588
		589	Example: remove any visible border around an image, center it vertically but move
		590	it to the right hand side.
		591
		592	align 1, 0.5, pad $img
		593
557	=item center $img	594	=item center $img
558		595
559	=item center $width, $height, $img	596	=item center $width, $height, $img
560		597
561	Centers the image, i.e. the center of the image is moved to the center of	598	Centers the image, i.e. the center of the image is moved to the center of
562	the terminal window (or the box specified by C<$width> and C<$height> if	599	the terminal window (or the box specified by C<$width> and C<$height> if
563	given).	600	given).
		601
		602	Example: load an image and center it.
		603
		604	center pad load "mybg.png"
564		605
565	=item rootalign $img	606	=item rootalign $img
566		607
567	Moves the image so that it appears glued to the screen as opposed to the	608	Moves the image so that it appears glued to the screen as opposed to the
568	window. This gives the illusion of a larger area behind the window. It is	609	window. This gives the illusion of a larger area behind the window. It is
…		…
574	rootalign mirror load "mybg.png"	615	rootalign mirror load "mybg.png"
575		616
576	Example: take the screen background and align it, giving the illusion of	617	Example: take the screen background and align it, giving the illusion of
577	transparency as long as the window isn't in front of other windows.	618	transparency as long as the window isn't in front of other windows.
578		619
579	rootalign root	620	rootalign root
580		621
581	=cut	622	=cut
582		623
583	sub move($$;$) {	624	sub move($$;$) {
584	my $img = pop->clone;	625	my $img = pop->clone;
585	$img->move ($_[0], $_[1]);	626	$img->move ($_[0], $_[1]);
586	$img	627	$img
587	}	628	}
588		629
		630	sub align($;$$) {
		631	my $img = pop;
		632
		633	move $_[0] * (TW - $img->w),
		634	$_[1] * (TH - $img->h),
		635	$img
		636	}
		637
589	sub center($;$$) {	638	sub center($;$$) {
590	my $img = pop;	639	my $img = pop;
591	my $w = $_[0] \|\| TW;	640	my $w = $_[0] \|\| TW;
592	my $h = $_[0] \|\| TH;	641	my $h = $_[1] \|\| TH;
593		642
594	move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img	643	move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img
595	}	644	}
596		645
597	sub rootalign($) {	646	sub rootalign($) {
598	move -TX, -TY, $_[0]	647	move -TX, -TY, $_[0]
599	}	648	}
600		649
		650	=item rotate $center_x, $center_y, $degrees
		651
		652	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
		653	pointer at C<$center_x> and C<$center_y> (specified as factor of image
		654	width/height).
		655
		656	#TODO# new width, height, maybe more operators?
		657
		658	Example: rotate the image by 90 degrees
		659
		660	=cut
		661
		662	sub rotate($$$$) {
		663	my $img = pop;
		664	$img->rotate (
		665	$_[0] * $img->w,
		666	$_[1] * $img->h,
		667	$_[2] * (3.14159265 / 180),
		668	)
		669	}
		670
		671	=back
		672
		673	=head2 COLOUR MODIFICATIONS
		674
		675	The following operators change the pixels of the image.
		676
		677	=over 4
		678
601	=item contrast $factor, $img	679	=item contrast $factor, $img
602		680
603	=item contrast $r, $g, $b, $img	681	=item contrast $r, $g, $b, $img
604		682
605	=item contrast $r, $g, $b, $a, $img	683	=item contrast $r, $g, $b, $a, $img
606		684
607	Adjusts the I<contrast> of an image.	685	Adjusts the I<contrast> of an image.
608		686
609	#TODO#	687	The first form applies a single C<$factor> to red, green and blue, the
		688	second form applies separate factors to each colour channel, and the last
		689	form includes the alpha channel.
610		690
		691	Values from 0 to 1 lower the contrast, values higher than 1 increase the
		692	contrast.
		693
		694	Due to limitations in the underlying XRender extension, lowering contrast
		695	also reduces brightness, while increasing contrast currently also
		696	increases brightness.
		697
611	=item brightness $factor, $img	698	=item brightness $bias, $img
612		699
613	=item brightness $r, $g, $b, $img	700	=item brightness $r, $g, $b, $img
614		701
615	=item brightness $r, $g, $b, $a, $img	702	=item brightness $r, $g, $b, $a, $img
616		703
617	Adjusts the brightness of an image.	704	Adjusts the brightness of an image.
618		705
		706	The first form applies a single C<$bias> to red, green and blue, the
		707	second form applies separate biases to each colour channel, and the last
		708	form includes the alpha channel.
		709
		710	Values less than 0 reduce brightness, while values larger than 0 increase
		711	it. Useful range is from -1 to 1 - the former results in a black, the
		712	latter in a white picture.
		713
		714	Due to idiosyncrasies in the underlying XRender extension, biases less
		715	than zero can be I<very> slow.
		716
619	=cut	717	=cut
620		718
621	sub contrast($$;$$;$) {	719	sub contrast($$;$$;$) {
622	my $img = pop;	720	my $img = pop;
623	my ($r, $g, $b, $a) = @_;	721	my ($r, $g, $b, $a) = @_;
624		722
625	($g, $b) = ($r, $r) if @_ < 4;	723	($g, $b) = ($r, $r) if @_ < 3;
626	$a = 1 if @_ < 5;	724	$a = 1 if @_ < 4;
627		725
628	$img = $img->clone;	726	$img = $img->clone;
629	$img->contrast ($r, $g, $b, $a);	727	$img->contrast ($r, $g, $b, $a);
630	$img	728	$img
631	}	729	}
632		730
633	sub brightness($$;$$;$) {	731	sub brightness($$;$$;$) {
634	my $img = pop;	732	my $img = pop;
635	my ($r, $g, $b, $a) = @_;	733	my ($r, $g, $b, $a) = @_;
636		734
637	($g, $b) = ($r, $r) if @_ < 4;	735	($g, $b) = ($r, $r) if @_ < 3;
638	$a = 1 if @_ < 5;	736	$a = 1 if @_ < 4;
639		737
640	$img = $img->clone;	738	$img = $img->clone;
641	$img->brightness ($r, $g, $b, $a);	739	$img->brightness ($r, $g, $b, $a);
642	$img	740	$img
643	}	741	}
…		…
659	sub blur($$;$) {	757	sub blur($$;$) {
660	my $img = pop;	758	my $img = pop;
661	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])	759	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
662	}	760	}
663		761
664	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees	762	=back
665		763
666	Rotates the image by C<$degrees> degrees, counter-clockwise, around the	764	=head2 OTHER STUFF
667	pointer at C<$center_x> and C<$center_y> (specified as factor of image
668	width/height), generating a new image with width C<$new_width> and height
669	C<$new_height>.
670		765
671	#TODO# new width, height, maybe more operators?	766	Anything that didn't fit any of the other categories, even after appliyng
		767	force and closing our eyes.
672		768
673	Example: rotate the image by 90 degrees	769	=over 4
674		770
675	=cut	771	=item once { ... }
676		772
677	sub rotate($$$$$$) {	773	This function takes a code block as argument, that is, one or more
678	my $img = pop;	774	statements enclosed by braces.
679	$img->rotate (	775
680	$_[0],	776	The trick is that this code block is only evaluated once - future calls
681	$_[1],	777	will simply return the original image (yes, it should only be used with
682	$_[2] * $img->w,	778	images).
683	$_[3] * $img->h,	779
684	$_[4] * (3.14159265 / 180),	780	This can be extremely useful to avoid redoign the same slow operations
		781	again and again- for example, if your background expression takes the root
		782	background, blurs it and then root-aligns it it would have to blur the
		783	root background on every window move or resize.
		784
		785	Putting the blur into a C<once> block will make sure the blur is only done
		786	once:
		787
		788	rootlign once { blur 10, root }
		789
		790	This leaves the question of how to force reevaluation of the block, in
		791	case the root background changes: Right now, all once blocks forget that
		792	they ahve been executed before each time the root background changes (if
		793	the expression is sensitive to that) or when C<once_again> is called.
		794
		795	=item once_again
		796
		797	Resets all C<once> block as if they had never been called, i.e. on the
		798	next call they will be reevaluated again.
		799
		800	=cut
		801
		802	sub once(&) {
		803	my $once = $self->{once_cache}{$_[0]+0} \|\|= do {
		804	local $new->{again};
		805	my @res = $_[0]();
		806	[$new->{again}, \@res]
685	)	807	};
		808
		809	$new->{again} = {
		810	%{ $new->{again} },
		811	%{ $once->[0] }
		812	};
		813
		814	# in scalar context we always return the first original result, which
		815	# is not quite how perl works.
		816	wantarray
		817	? @{ $once->[1] }
		818	: $once->[1][0]
		819	}
		820
		821	sub once_again() {
		822	delete $self->{once_cache};
686	}	823	}
687		824
688	=back	825	=back
689		826
690	=cut	827	=cut
…		…
733		870
734	# evaluate user expression	871	# evaluate user expression
735		872
736	my $img = eval { $self->{expr}->() };	873	my $img = eval { $self->{expr}->() };
737	warn $@ if $@;#d#	874	warn $@ if $@;#d#
738	die if !UNIVERSAL::isa $img, "urxvt::img";	875	die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img";
739		876
740	$state->{size_sensitive} = 1	877	# if the expression is sensitive to external events, prepare reevaluation then
		878
		879	my $again = delete $state->{again};
		880
		881	$again->{size} = 1
741	if $img->repeat_mode != urxvt::RepeatNormal;	882	if $img->repeat_mode != urxvt::RepeatNormal;
742		883
743	# if the expression is sensitive to external events, prepare reevaluation then
744
745	my $repeat;
746
747	if (my $again = $state->{again}) {	884	if (my $again = $again->{time}) {
748	$repeat = 1;
749	my $self = $self;	885	my $self = $self;
750	$state->{timer} = $again == $old->{again}	886	$state->{timer} = $again == $old->{again}
751	? $old->{timer}	887	? $old->{timer}
752	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {	888	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
753	++$self->{counter};	889	++$self->{counter};
754	$self->recalculate	890	$self->recalculate
755	});	891	});
756	}	892	}
757		893
758	if (delete $state->{position_sensitive}) {	894	if ($again->{position}) {
759	$repeat = 1;
760	$self->enable (position_change => sub { $_[0]->recalculate });	895	$self->enable (position_change => sub { $_[0]->recalculate });
761	} else {	896	} else {
762	$self->disable ("position_change");	897	$self->disable ("position_change");
763	}	898	}
764		899
765	if (delete $state->{size_sensitive}) {	900	if ($again->{size}) {
766	$repeat = 1;
767	$self->enable (size_change => sub { $_[0]->recalculate });	901	$self->enable (size_change => sub { $_[0]->recalculate });
768	} else {	902	} else {
769	$self->disable ("size_change");	903	$self->disable ("size_change");
770	}	904	}
771		905
772	if (delete $state->{rootpmap_sensitive}) {	906	if ($again->{rootpmap}) {
773	$repeat = 1;
774	$self->enable (rootpmap_change => sub { $_[0]->recalculate });	907	$self->enable (rootpmap_change => sub {
		908	delete $_[0]{once_cache}; # this will override once-block values from
		909	$_[0]->recalculate;
		910	});
775	} else {	911	} else {
776	$self->disable ("rootpmap_change");	912	$self->disable ("rootpmap_change");
777	}	913	}
778		914
779	# clear stuff we no longer need	915	# clear stuff we no longer need
780		916
781	%$old = ();	917	%$old = ();
782		918
783	unless ($repeat) {	919	unless (%$again) {
784	delete $self->{state};	920	delete $self->{state};
785	delete $self->{expr};	921	delete $self->{expr};
786	}	922	}
787		923
788	# set background pixmap	924	# set background pixmap
…		…
793	}	929	}
794		930
795	sub on_start {	931	sub on_start {
796	my ($self) = @_;	932	my ($self) = @_;
797		933
798	my $expr = $self->x_resource ("background.expr")	934	my $expr = $self->x_resource ("%.expr")
799	or return;	935	or return;
800		936
		937	$self->has_render
		938	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";
		939
801	$self->set_expr (parse_expr $expr);	940	$self->set_expr (parse_expr $expr);
802	$self->{border} = $self->x_resource_boolean ("background.border");	941	$self->{border} = $self->x_resource_boolean ("%.border");
		942
		943	$MIN_INTERVAL = $self->x_resource ("%.interval");
803		944
804	()	945	()
805	}	946	}
806		947

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.44 by root, Sun Jun 10 11:31:22 2012 UTC vs. Revision 1.55 by root, Thu Jun 14 16:48:57 2012 UTC

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Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.44 by root, Sun Jun 10 11:31:22 2012 UTC vs.
Revision 1.55 by root, Thu Jun 14 16:48:57 2012 UTC