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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.43 by root, Sun Jun 10 11:23:20 2012 UTC vs.
Revision 1.57 by root, Thu Jun 14 18:06:15 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		305
355	=back	306	=item merge $img ...
		307
		308	Takes any number of images and merges them together, creating a single
		309	image containing them all.
		310
		311	=cut
		312
		313	sub merge(@) {
		314	#TODO
		315	}
356		316
357	=head2 TILING MODES	317	=head2 TILING MODES
358		318
359	The following operators modify the tiling mode of an image, that is, the	319	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.	320	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	350	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	351	image over another image or the background colour while leaving all
392	background pixels outside the image unchanged.	352	background pixels outside the image unchanged.
393		353
394	Example: load an image and display it in the upper left corner. The rest	354	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	355	of the space is left "empty" (transparent or whatever your compositor does
396	in alpha mode, else background colour).	356	in alpha mode, else background colour).
397		357
398	pad load "mybg.png"	358	pad load "mybg.png"
399		359
400	=item extend $img	360	=item extend $img
401		361
402	Extends the image over the whole plane, using the closest pixel in the	362	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	363	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	364	filtering operations and want the pixels outside the image to have the
405	same values as the pixels near the edge.	365	same values as the pixels near the edge.
406		366
407	Example: just for curiosity, how does this pixel extension stuff work?	367	Example: just for curiosity, how does this pixel extension stuff work?
408		368
…		…
434	$img	394	$img
435	}	395	}
436		396
437	=back	397	=back
438		398
439	=head2 PIXEL OPERATORS	399	=head2 VARIABLE VALUES
440		400
441	The following operators modify the image pixels in various ways.	401	The following functions provide variable data such as the terminal window
		402	dimensions. They are not (Perl-) variables, they just return stuff that
		403	varies. Most of them make your expression sensitive to some events, for
		404	example using C<TW> (terminal width) means your expression is evaluated
		405	again when the terminal is resized.
442		406
443	=over 4	407	=over 4
444		408
445	=item clone $img	409	=item TX
446		410
447	Returns an exact copy of the image.	411	=item TY
448		412
449	=cut	413	Return the X and Y coordinates of the terminal window (the terminal
		414	window is the full window by default, and the character area only when in
		415	border-respect mode).
450		416
		417	Using these functions make your expression sensitive to window moves.
		418
		419	These functions are mainly useful to align images to the root window.
		420
		421	Example: load an image and align it so it looks as if anchored to the
		422	background.
		423
		424	move -TX, -TY, load "mybg.png"
		425
		426	=item TW
		427
		428	Return the width (C<TW>) and height (C<TH>) of the terminal window (the
		429	terminal window is the full window by default, and the character area only
		430	when in border-respect mode).
		431
		432	Using these functions make your expression sensitive to window resizes.
		433
		434	These functions are mainly useful to scale images, or to clip images to
		435	the window size to conserve memory.
		436
		437	Example: take the screen background, clip it to the window size, blur it a
		438	bit, align it to the window position and use it as background.
		439
		440	clip move -TX, -TY, once { blur 5, root }
		441
		442	=cut
		443
		444	sub TX() { $new->{again}{position} = 1; $x }
		445	sub TY() { $new->{again}{position} = 1; $y }
		446	sub TW() { $new->{again}{size} = 1; $w }
		447	sub TH() { $new->{again}{size} = 1; $h }
		448
		449	=item now
		450
		451	Returns the current time as (fractional) seconds since the epoch.
		452
		453	Using this expression does I<not> make your expression sensitive to time,
		454	but the next two functions do.
		455
		456	=item again $seconds
		457
		458	When this function is used the expression will be reevaluated again in
		459	C<$seconds> seconds.
		460
		461	Example: load some image and rotate it according to the time of day (as if it were
		462	the hour pointer of a clock). Update this image every minute.
		463
		464	again 60; rotate 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"
		465
		466	=item counter $seconds
		467
		468	Like C<again>, but also returns an increasing counter value, starting at
		469	0, which might be useful for some simple animation effects.
		470
		471	=cut
		472
		473	sub now() { urxvt::NOW }
		474
		475	sub again($) {
		476	$new->{again}{time} = $_[0];
		477	}
		478
451	sub clone($) {	479	sub counter($) {
452	$_[0]->clone	480	$new->{again}{time} = $_[0];
		481	$self->{counter} + 0
453	}	482	}
		483
		484	=back
		485
		486	=head2 SHAPE CHANGING OPERATORS
		487
		488	The following operators modify the shape, size or position of the image.
		489
		490	=over 4
454		491
455	=item clip $img	492	=item clip $img
456		493
457	=item clip $width, $height, $img	494	=item clip $width, $height, $img
458		495
…		…
552		589
553	Example: move the image right by 20 pixels and down by 30.	590	Example: move the image right by 20 pixels and down by 30.
554		591
555	move 20, 30, ...	592	move 20, 30, ...
556		593
		594	=item align $xalign, $yalign, $img
		595
		596	Aligns the image according to a factor - C<0> means the image is moved to
		597	the left or top edge (for C<$xalign> or C<$yalign>), C<0.5> means it is
		598	exactly centered and C<1> means it touches the right or bottom edge.
		599
		600	Example: remove any visible border around an image, center it vertically but move
		601	it to the right hand side.
		602
		603	align 1, 0.5, pad $img
		604
		605	=item center $img
		606
		607	=item center $width, $height, $img
		608
		609	Centers the image, i.e. the center of the image is moved to the center of
		610	the terminal window (or the box specified by C<$width> and C<$height> if
		611	given).
		612
		613	Example: load an image and center it.
		614
		615	center pad load "mybg.png"
		616
557	=item rootalign $img	617	=item rootalign $img
558		618
559	Moves the image so that it appears glued to the screen as opposed to the	619	Moves the image so that it appears glued to the screen as opposed to the
560	window. This gives the illusion of a larger area behind the window. It is	620	window. This gives the illusion of a larger area behind the window. It is
561	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the	621	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the
…		…
566	rootalign mirror load "mybg.png"	626	rootalign mirror load "mybg.png"
567		627
568	Example: take the screen background and align it, giving the illusion of	628	Example: take the screen background and align it, giving the illusion of
569	transparency as long as the window isn't in front of other windows.	629	transparency as long as the window isn't in front of other windows.
570		630
571	rootalign root	631	rootalign root
572		632
573	=cut	633	=cut
574		634
575	sub move($$;$) {	635	sub move($$;$) {
576	my $img = pop->clone;	636	my $img = pop->clone;
577	$img->move ($_[0], $_[1]);	637	$img->move ($_[0], $_[1]);
578	$img	638	$img
579	}	639	}
580		640
		641	sub align($;$$) {
		642	my $img = pop;
		643
		644	move $_[0] * (TW - $img->w),
		645	$_[1] * (TH - $img->h),
		646	$img
		647	}
		648
		649	sub center($;$$) {
		650	my $img = pop;
		651	my $w = $_[0] \|\| TW;
		652	my $h = $_[1] \|\| TH;
		653
		654	move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img
		655	}
		656
581	sub rootalign($) {	657	sub rootalign($) {
582	move -TX, -TY, $_[0]	658	move -TX, -TY, $_[0]
583	}	659	}
584		660
		661	=item rotate $center_x, $center_y, $degrees
		662
		663	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
		664	pointer at C<$center_x> and C<$center_y> (specified as factor of image
		665	width/height).
		666
		667	#TODO# new width, height, maybe more operators?
		668
		669	Example: rotate the image by 90 degrees
		670
		671	=cut
		672
		673	sub rotate($$$$) {
		674	my $img = pop;
		675	$img->rotate (
		676	$_[0] * $img->w,
		677	$_[1] * $img->h,
		678	$_[2] * (3.14159265 / 180),
		679	)
		680	}
		681
		682	=back
		683
		684	=head2 COLOUR MODIFICATIONS
		685
		686	The following operators change the pixels of the image.
		687
		688	=over 4
		689
585	=item contrast $factor, $img	690	=item contrast $factor, $img
586		691
587	=item contrast $r, $g, $b, $img	692	=item contrast $r, $g, $b, $img
588		693
589	=item contrast $r, $g, $b, $a, $img	694	=item contrast $r, $g, $b, $a, $img
590		695
591	Adjusts the I<contrast> of an image.	696	Adjusts the I<contrast> of an image.
592		697
593	#TODO#	698	The first form applies a single C<$factor> to red, green and blue, the
		699	second form applies separate factors to each colour channel, and the last
		700	form includes the alpha channel.
594		701
		702	Values from 0 to 1 lower the contrast, values higher than 1 increase the
		703	contrast.
		704
		705	Due to limitations in the underlying XRender extension, lowering contrast
		706	also reduces brightness, while increasing contrast currently also
		707	increases brightness.
		708
595	=item brightness $factor, $img	709	=item brightness $bias, $img
596		710
597	=item brightness $r, $g, $b, $img	711	=item brightness $r, $g, $b, $img
598		712
599	=item brightness $r, $g, $b, $a, $img	713	=item brightness $r, $g, $b, $a, $img
600		714
601	Adjusts the brightness of an image.	715	Adjusts the brightness of an image.
602		716
		717	The first form applies a single C<$bias> to red, green and blue, the
		718	second form applies separate biases to each colour channel, and the last
		719	form includes the alpha channel.
		720
		721	Values less than 0 reduce brightness, while values larger than 0 increase
		722	it. Useful range is from -1 to 1 - the former results in a black, the
		723	latter in a white picture.
		724
		725	Due to idiosyncrasies in the underlying XRender extension, biases less
		726	than zero can be I<very> slow.
		727
603	=cut	728	=cut
604		729
605	sub contrast($$;$$;$) {	730	sub contrast($$;$$;$) {
606	my $img = pop;	731	my $img = pop;
607	my ($r, $g, $b, $a) = @_;	732	my ($r, $g, $b, $a) = @_;
608		733
609	($g, $b) = ($r, $r) if @_ < 4;	734	($g, $b) = ($r, $r) if @_ < 3;
610	$a = 1 if @_ < 5;	735	$a = 1 if @_ < 4;
611		736
612	$img = $img->clone;	737	$img = $img->clone;
613	$img->contrast ($r, $g, $b, $a);	738	$img->contrast ($r, $g, $b, $a);
614	$img	739	$img
615	}	740	}
616		741
617	sub brightness($$;$$;$) {	742	sub brightness($$;$$;$) {
618	my $img = pop;	743	my $img = pop;
619	my ($r, $g, $b, $a) = @_;	744	my ($r, $g, $b, $a) = @_;
620		745
621	($g, $b) = ($r, $r) if @_ < 4;	746	($g, $b) = ($r, $r) if @_ < 3;
622	$a = 1 if @_ < 5;	747	$a = 1 if @_ < 4;
623		748
624	$img = $img->clone;	749	$img = $img->clone;
625	$img->brightness ($r, $g, $b, $a);	750	$img->brightness ($r, $g, $b, $a);
626	$img	751	$img
627	}	752	}
…		…
643	sub blur($$;$) {	768	sub blur($$;$) {
644	my $img = pop;	769	my $img = pop;
645	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])	770	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
646	}	771	}
647		772
648	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees	773	=back
649		774
650	Rotates the image by C<$degrees> degrees, counter-clockwise, around the	775	=head2 OTHER STUFF
651	pointer at C<$center_x> and C<$center_y> (specified as factor of image
652	width/height), generating a new image with width C<$new_width> and height
653	C<$new_height>.
654		776
655	#TODO# new width, height, maybe more operators?	777	Anything that didn't fit any of the other categories, even after applying
		778	force and closing our eyes.
656		779
657	Example: rotate the image by 90 degrees	780	=over 4
658		781
659	=cut	782	=item once { ... }
660		783
661	sub rotate($$$$$$) {	784	This function takes a code block as argument, that is, one or more
662	my $img = pop;	785	statements enclosed by braces.
663	$img->rotate (	786
664	$_[0],	787	The trick is that this code block is only evaluated once - future calls
665	$_[1],	788	will simply return the original image (yes, it should only be used with
666	$_[2] * $img->w,	789	images).
667	$_[3] * $img->h,	790
668	$_[4] * (3.14159265 / 180),	791	This can be extremely useful to avoid redoign the same slow operations
		792	again and again- for example, if your background expression takes the root
		793	background, blurs it and then root-aligns it it would have to blur the
		794	root background on every window move or resize.
		795
		796	Putting the blur into a C<once> block will make sure the blur is only done
		797	once:
		798
		799	rootlign once { blur 10, root }
		800
		801	This leaves the question of how to force reevaluation of the block, in
		802	case the root background changes: Right now, all once blocks forget that
		803	they ahve been executed before each time the root background changes (if
		804	the expression is sensitive to that) or when C<once_again> is called.
		805
		806	=item once_again
		807
		808	Resets all C<once> block as if they had never been called, i.e. on the
		809	next call they will be reevaluated again.
		810
		811	=cut
		812
		813	sub once(&) {
		814	my $once = $self->{once_cache}{$_[0]+0} \|\|= do {
		815	local $new->{again};
		816	my @res = $_[0]();
		817	[$new->{again}, \@res]
669	)	818	};
		819
		820	$new->{again} = {
		821	%{ $new->{again} },
		822	%{ $once->[0] }
		823	};
		824
		825	# in scalar context we always return the first original result, which
		826	# is not quite how perl works.
		827	wantarray
		828	? @{ $once->[1] }
		829	: $once->[1][0]
		830	}
		831
		832	sub once_again() {
		833	delete $self->{once_cache};
670	}	834	}
671		835
672	=back	836	=back
673		837
674	=cut	838	=cut
…		…
717		881
718	# evaluate user expression	882	# evaluate user expression
719		883
720	my $img = eval { $self->{expr}->() };	884	my $img = eval { $self->{expr}->() };
721	warn $@ if $@;#d#	885	warn $@ if $@;#d#
722	die if !UNIVERSAL::isa $img, "urxvt::img";	886	die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img";
723		887
724	$state->{size_sensitive} = 1	888	# if the expression is sensitive to external events, prepare reevaluation then
		889
		890	my $again = delete $state->{again};
		891
		892	$again->{size} = 1
725	if $img->repeat_mode != urxvt::RepeatNormal;	893	if $img->repeat_mode != urxvt::RepeatNormal;
726		894
727	# if the expression is sensitive to external events, prepare reevaluation then
728
729	my $repeat;
730
731	if (my $again = $state->{again}) {	895	if (my $again = $again->{time}) {
732	$repeat = 1;
733	my $self = $self;	896	my $self = $self;
734	$state->{timer} = $again == $old->{again}	897	$state->{timer} = $again == $old->{again}
735	? $old->{timer}	898	? $old->{timer}
736	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {	899	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
737	++$self->{counter};	900	++$self->{counter};
738	$self->recalculate	901	$self->recalculate
739	});	902	});
740	}	903	}
741		904
742	if (delete $state->{position_sensitive}) {	905	if ($again->{position}) {
743	$repeat = 1;
744	$self->enable (position_change => sub { $_[0]->recalculate });	906	$self->enable (position_change => sub { $_[0]->recalculate });
745	} else {	907	} else {
746	$self->disable ("position_change");	908	$self->disable ("position_change");
747	}	909	}
748		910
749	if (delete $state->{size_sensitive}) {	911	if ($again->{size}) {
750	$repeat = 1;
751	$self->enable (size_change => sub { $_[0]->recalculate });	912	$self->enable (size_change => sub { $_[0]->recalculate });
752	} else {	913	} else {
753	$self->disable ("size_change");	914	$self->disable ("size_change");
754	}	915	}
755		916
756	if (delete $state->{rootpmap_sensitive}) {	917	if ($again->{rootpmap}) {
757	$repeat = 1;
758	$self->enable (rootpmap_change => sub { $_[0]->recalculate });	918	$self->enable (rootpmap_change => sub {
		919	delete $_[0]{once_cache}; # this will override once-block values from
		920	$_[0]->recalculate;
		921	});
759	} else {	922	} else {
760	$self->disable ("rootpmap_change");	923	$self->disable ("rootpmap_change");
761	}	924	}
762		925
763	# clear stuff we no longer need	926	# clear stuff we no longer need
764		927
765	%$old = ();	928	%$old = ();
766		929
767	unless ($repeat) {	930	unless (%$again) {
768	delete $self->{state};	931	delete $self->{state};
769	delete $self->{expr};	932	delete $self->{expr};
770	}	933	}
771		934
772	# set background pixmap	935	# set background pixmap
…		…
777	}	940	}
778		941
779	sub on_start {	942	sub on_start {
780	my ($self) = @_;	943	my ($self) = @_;
781		944
782	my $expr = $self->x_resource ("background.expr")	945	my $expr = $self->x_resource ("%.expr")
783	or return;	946	or return;
784		947
		948	$self->has_render
		949	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";
		950
785	$self->set_expr (parse_expr $expr);	951	$self->set_expr (parse_expr $expr);
786	$self->{border} = $self->x_resource_boolean ("background.border");	952	$self->{border} = $self->x_resource_boolean ("%.border");
		953
		954	$MIN_INTERVAL = $self->x_resource ("%.interval");
787		955
788	()	956	()
789	}	957	}
790		958

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.43 by root, Sun Jun 10 11:23:20 2012 UTC vs. Revision 1.57 by root, Thu Jun 14 18:06:15 2012 UTC

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Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.43 by root, Sun Jun 10 11:23:20 2012 UTC vs.
Revision 1.57 by root, Thu Jun 14 18:06:15 2012 UTC