[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 1.56 by root, Thu Jun 14 17:06:57 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		305
355	=back	306	=item merge $img ...
		307
		308	Takes any number of images and merges them together, creating a single image containing them all.
		309
		310	=cut
		311
		312	sub merge(@) {
		313	#TODO
		314	}
356		315
357	=head2 TILING MODES	316	=head2 TILING MODES
358		317
359	The following operators modify the tiling mode of an image, that is, the	318	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.	319	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	349	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	350	image over another image or the background colour while leaving all
392	background pixels outside the image unchanged.	351	background pixels outside the image unchanged.
393		352
394	Example: load an image and display it in the upper left corner. The rest	353	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	354	of the space is left "empty" (transparent or whatever your compositor does
396	in alpha mode, else background colour).	355	in alpha mode, else background colour).
397		356
398	pad load "mybg.png"	357	pad load "mybg.png"
399		358
400	=item extend $img	359	=item extend $img
401		360
402	Extends the image over the whole plane, using the closest pixel in the	361	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	362	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	363	filtering operations and want the pixels outside the image to have the
405	same values as the pixels near the edge.	364	same values as the pixels near the edge.
406		365
407	Example: just for curiosity, how does this pixel extension stuff work?	366	Example: just for curiosity, how does this pixel extension stuff work?
408		367
…		…
434	$img	393	$img
435	}	394	}
436		395
437	=back	396	=back
438		397
439	=head2 PIXEL OPERATORS	398	=head2 VARIABLE VALUES
440		399
441	The following operators modify the image pixels in various ways.	400	The following functions provide variable data such as the terminal window
		401	dimensions. They are not (Perl-) variables, they just return stuff that
		402	varies. Most of them make your expression sensitive to some events, for
		403	example using C<TW> (terminal width) means your expression is evaluated
		404	again when the terminal is resized.
442		405
443	=over 4	406	=over 4
444		407
445	=item clone $img	408	=item TX
446		409
447	Returns an exact copy of the image.	410	=item TY
448		411
449	=cut	412	Return the X and Y coordinates of the terminal window (the terminal
		413	window is the full window by default, and the character area only when in
		414	border-respect mode).
450		415
		416	Using these functions make your expression sensitive to window moves.
		417
		418	These functions are mainly useful to align images to the root window.
		419
		420	Example: load an image and align it so it looks as if anchored to the
		421	background.
		422
		423	move -TX, -TY, load "mybg.png"
		424
		425	=item TW
		426
		427	Return the width (C<TW>) and height (C<TH>) of the terminal window (the
		428	terminal window is the full window by default, and the character area only
		429	when in border-respect mode).
		430
		431	Using these functions make your expression sensitive to window resizes.
		432
		433	These functions are mainly useful to scale images, or to clip images to
		434	the window size to conserve memory.
		435
		436	Example: take the screen background, clip it to the window size, blur it a
		437	bit, align it to the window position and use it as background.
		438
		439	clip move -TX, -TY, once { blur 5, root }
		440
		441	=cut
		442
		443	sub TX() { $new->{again}{position} = 1; $x }
		444	sub TY() { $new->{again}{position} = 1; $y }
		445	sub TW() { $new->{again}{size} = 1; $w }
		446	sub TH() { $new->{again}{size} = 1; $h }
		447
		448	=item now
		449
		450	Returns the current time as (fractional) seconds since the epoch.
		451
		452	Using this expression does I<not> make your expression sensitive to time,
		453	but the next two functions do.
		454
		455	=item again $seconds
		456
		457	When this function is used the expression will be reevaluated again in
		458	C<$seconds> seconds.
		459
		460	Example: load some image and rotate it according to the time of day (as if it were
		461	the hour pointer of a clock). Update this image every minute.
		462
		463	again 60; rotate 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"
		464
		465	=item counter $seconds
		466
		467	Like C<again>, but also returns an increasing counter value, starting at
		468	0, which might be useful for some simple animation effects.
		469
		470	=cut
		471
		472	sub now() { urxvt::NOW }
		473
		474	sub again($) {
		475	$new->{again}{time} = $_[0];
		476	}
		477
451	sub clone($) {	478	sub counter($) {
452	$_[0]->clone	479	$new->{again}{time} = $_[0];
		480	$self->{counter} + 0
453	}	481	}
		482
		483	=back
		484
		485	=head2 SHAPE CHANGING OPERATORS
		486
		487	The following operators modify the shape, size or position of the image.
		488
		489	=over 4
454		490
455	=item clip $img	491	=item clip $img
456		492
457	=item clip $width, $height, $img	493	=item clip $width, $height, $img
458		494
…		…
552		588
553	Example: move the image right by 20 pixels and down by 30.	589	Example: move the image right by 20 pixels and down by 30.
554		590
555	move 20, 30, ...	591	move 20, 30, ...
556		592
		593	=item align $xalign, $yalign, $img
		594
		595	Aligns the image according to a factor - C<0> means the image is moved to
		596	the left or top edge (for C<$xalign> or C<$yalign>), C<0.5> means it is
		597	exactly centered and C<1> means it touches the right or bottom edge.
		598
		599	Example: remove any visible border around an image, center it vertically but move
		600	it to the right hand side.
		601
		602	align 1, 0.5, pad $img
		603
		604	=item center $img
		605
		606	=item center $width, $height, $img
		607
		608	Centers the image, i.e. the center of the image is moved to the center of
		609	the terminal window (or the box specified by C<$width> and C<$height> if
		610	given).
		611
		612	Example: load an image and center it.
		613
		614	center pad load "mybg.png"
		615
557	=item rootalign $img	616	=item rootalign $img
558		617
559	Moves the image so that it appears glued to the screen as opposed to the	618	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	619	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	620	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the
…		…
566	rootalign mirror load "mybg.png"	625	rootalign mirror load "mybg.png"
567		626
568	Example: take the screen background and align it, giving the illusion of	627	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.	628	transparency as long as the window isn't in front of other windows.
570		629
571	rootalign root	630	rootalign root
572		631
573	=cut	632	=cut
574		633
575	sub move($$;$) {	634	sub move($$;$) {
576	my $img = pop->clone;	635	my $img = pop->clone;
577	$img->move ($_[0], $_[1]);	636	$img->move ($_[0], $_[1]);
578	$img	637	$img
579	}	638	}
580		639
		640	sub align($;$$) {
		641	my $img = pop;
		642
		643	move $_[0] * (TW - $img->w),
		644	$_[1] * (TH - $img->h),
		645	$img
		646	}
		647
		648	sub center($;$$) {
		649	my $img = pop;
		650	my $w = $_[0] \|\| TW;
		651	my $h = $_[1] \|\| TH;
		652
		653	move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img
		654	}
		655
581	sub rootalign($) {	656	sub rootalign($) {
582	move -TX, -TY, $_[0]	657	move -TX, -TY, $_[0]
583	}	658	}
584		659
		660	=item rotate $center_x, $center_y, $degrees
		661
		662	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
		663	pointer at C<$center_x> and C<$center_y> (specified as factor of image
		664	width/height).
		665
		666	#TODO# new width, height, maybe more operators?
		667
		668	Example: rotate the image by 90 degrees
		669
		670	=cut
		671
		672	sub rotate($$$$) {
		673	my $img = pop;
		674	$img->rotate (
		675	$_[0] * $img->w,
		676	$_[1] * $img->h,
		677	$_[2] * (3.14159265 / 180),
		678	)
		679	}
		680
		681	=back
		682
		683	=head2 COLOUR MODIFICATIONS
		684
		685	The following operators change the pixels of the image.
		686
		687	=over 4
		688
585	=item contrast $factor, $img	689	=item contrast $factor, $img
586		690
587	=item contrast $r, $g, $b, $img	691	=item contrast $r, $g, $b, $img
588		692
589	=item contrast $r, $g, $b, $a, $img	693	=item contrast $r, $g, $b, $a, $img
590		694
591	Adjusts the I<contrast> of an image.	695	Adjusts the I<contrast> of an image.
592		696
593	#TODO#	697	The first form applies a single C<$factor> to red, green and blue, the
		698	second form applies separate factors to each colour channel, and the last
		699	form includes the alpha channel.
594		700
		701	Values from 0 to 1 lower the contrast, values higher than 1 increase the
		702	contrast.
		703
		704	Due to limitations in the underlying XRender extension, lowering contrast
		705	also reduces brightness, while increasing contrast currently also
		706	increases brightness.
		707
595	=item brightness $factor, $img	708	=item brightness $bias, $img
596		709
597	=item brightness $r, $g, $b, $img	710	=item brightness $r, $g, $b, $img
598		711
599	=item brightness $r, $g, $b, $a, $img	712	=item brightness $r, $g, $b, $a, $img
600		713
601	Adjusts the brightness of an image.	714	Adjusts the brightness of an image.
602		715
		716	The first form applies a single C<$bias> to red, green and blue, the
		717	second form applies separate biases to each colour channel, and the last
		718	form includes the alpha channel.
		719
		720	Values less than 0 reduce brightness, while values larger than 0 increase
		721	it. Useful range is from -1 to 1 - the former results in a black, the
		722	latter in a white picture.
		723
		724	Due to idiosyncrasies in the underlying XRender extension, biases less
		725	than zero can be I<very> slow.
		726
603	=cut	727	=cut
604		728
605	sub contrast($$;$$;$) {	729	sub contrast($$;$$;$) {
606	my $img = pop;	730	my $img = pop;
607	my ($r, $g, $b, $a) = @_;	731	my ($r, $g, $b, $a) = @_;
608		732
609	($g, $b) = ($r, $r) if @_ < 4;	733	($g, $b) = ($r, $r) if @_ < 3;
610	$a = 1 if @_ < 5;	734	$a = 1 if @_ < 4;
611		735
612	$img = $img->clone;	736	$img = $img->clone;
613	$img->contrast ($r, $g, $b, $a);	737	$img->contrast ($r, $g, $b, $a);
614	$img	738	$img
615	}	739	}
616		740
617	sub brightness($$;$$;$) {	741	sub brightness($$;$$;$) {
618	my $img = pop;	742	my $img = pop;
619	my ($r, $g, $b, $a) = @_;	743	my ($r, $g, $b, $a) = @_;
620		744
621	($g, $b) = ($r, $r) if @_ < 4;	745	($g, $b) = ($r, $r) if @_ < 3;
622	$a = 1 if @_ < 5;	746	$a = 1 if @_ < 4;
623		747
624	$img = $img->clone;	748	$img = $img->clone;
625	$img->brightness ($r, $g, $b, $a);	749	$img->brightness ($r, $g, $b, $a);
626	$img	750	$img
627	}	751	}
…		…
643	sub blur($$;$) {	767	sub blur($$;$) {
644	my $img = pop;	768	my $img = pop;
645	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])	769	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
646	}	770	}
647		771
648	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees	772	=back
649		773
650	Rotates the image by C<$degrees> degrees, counter-clockwise, around the	774	=head2 OTHER STUFF
651	pointer at C<$center_x> and C<$center_y> (specified as factor of image
652	width/height), generating a new image with width C<$new_width> and height
653	C<$new_height>.
654		775
655	#TODO# new width, height, maybe more operators?	776	Anything that didn't fit any of the other categories, even after applying
		777	force and closing our eyes.
656		778
657	Example: rotate the image by 90 degrees	779	=over 4
658		780
659	=cut	781	=item once { ... }
660		782
661	sub rotate($$$$$$) {	783	This function takes a code block as argument, that is, one or more
662	my $img = pop;	784	statements enclosed by braces.
663	$img->rotate (	785
664	$_[0],	786	The trick is that this code block is only evaluated once - future calls
665	$_[1],	787	will simply return the original image (yes, it should only be used with
666	$_[2] * $img->w,	788	images).
667	$_[3] * $img->h,	789
668	$_[4] * (3.14159265 / 180),	790	This can be extremely useful to avoid redoign the same slow operations
		791	again and again- for example, if your background expression takes the root
		792	background, blurs it and then root-aligns it it would have to blur the
		793	root background on every window move or resize.
		794
		795	Putting the blur into a C<once> block will make sure the blur is only done
		796	once:
		797
		798	rootlign once { blur 10, root }
		799
		800	This leaves the question of how to force reevaluation of the block, in
		801	case the root background changes: Right now, all once blocks forget that
		802	they ahve been executed before each time the root background changes (if
		803	the expression is sensitive to that) or when C<once_again> is called.
		804
		805	=item once_again
		806
		807	Resets all C<once> block as if they had never been called, i.e. on the
		808	next call they will be reevaluated again.
		809
		810	=cut
		811
		812	sub once(&) {
		813	my $once = $self->{once_cache}{$_[0]+0} \|\|= do {
		814	local $new->{again};
		815	my @res = $_[0]();
		816	[$new->{again}, \@res]
669	)	817	};
		818
		819	$new->{again} = {
		820	%{ $new->{again} },
		821	%{ $once->[0] }
		822	};
		823
		824	# in scalar context we always return the first original result, which
		825	# is not quite how perl works.
		826	wantarray
		827	? @{ $once->[1] }
		828	: $once->[1][0]
		829	}
		830
		831	sub once_again() {
		832	delete $self->{once_cache};
670	}	833	}
671		834
672	=back	835	=back
673		836
674	=cut	837	=cut
…		…
717		880
718	# evaluate user expression	881	# evaluate user expression
719		882
720	my $img = eval { $self->{expr}->() };	883	my $img = eval { $self->{expr}->() };
721	warn $@ if $@;#d#	884	warn $@ if $@;#d#
722	die if !UNIVERSAL::isa $img, "urxvt::img";	885	die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img";
723		886
724	$state->{size_sensitive} = 1	887	# if the expression is sensitive to external events, prepare reevaluation then
		888
		889	my $again = delete $state->{again};
		890
		891	$again->{size} = 1
725	if $img->repeat_mode != urxvt::RepeatNormal;	892	if $img->repeat_mode != urxvt::RepeatNormal;
726		893
727	# if the expression is sensitive to external events, prepare reevaluation then
728
729	my $repeat;
730
731	if (my $again = $state->{again}) {	894	if (my $again = $again->{time}) {
732	$repeat = 1;
733	my $self = $self;	895	my $self = $self;
734	$state->{timer} = $again == $old->{again}	896	$state->{timer} = $again == $old->{again}
735	? $old->{timer}	897	? $old->{timer}
736	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {	898	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
737	++$self->{counter};	899	++$self->{counter};
738	$self->recalculate	900	$self->recalculate
739	});	901	});
740	}	902	}
741		903
742	if (delete $state->{position_sensitive}) {	904	if ($again->{position}) {
743	$repeat = 1;
744	$self->enable (position_change => sub { $_[0]->recalculate });	905	$self->enable (position_change => sub { $_[0]->recalculate });
745	} else {	906	} else {
746	$self->disable ("position_change");	907	$self->disable ("position_change");
747	}	908	}
748		909
749	if (delete $state->{size_sensitive}) {	910	if ($again->{size}) {
750	$repeat = 1;
751	$self->enable (size_change => sub { $_[0]->recalculate });	911	$self->enable (size_change => sub { $_[0]->recalculate });
752	} else {	912	} else {
753	$self->disable ("size_change");	913	$self->disable ("size_change");
754	}	914	}
755		915
756	if (delete $state->{rootpmap_sensitive}) {	916	if ($again->{rootpmap}) {
757	$repeat = 1;
758	$self->enable (rootpmap_change => sub { $_[0]->recalculate });	917	$self->enable (rootpmap_change => sub {
		918	delete $_[0]{once_cache}; # this will override once-block values from
		919	$_[0]->recalculate;
		920	});
759	} else {	921	} else {
760	$self->disable ("rootpmap_change");	922	$self->disable ("rootpmap_change");
761	}	923	}
762		924
763	# clear stuff we no longer need	925	# clear stuff we no longer need
764		926
765	%$old = ();	927	%$old = ();
766		928
767	unless ($repeat) {	929	unless (%$again) {
768	delete $self->{state};	930	delete $self->{state};
769	delete $self->{expr};	931	delete $self->{expr};
770	}	932	}
771		933
772	# set background pixmap	934	# set background pixmap
…		…
777	}	939	}
778		940
779	sub on_start {	941	sub on_start {
780	my ($self) = @_;	942	my ($self) = @_;
781		943
782	my $expr = $self->x_resource ("background.expr")	944	my $expr = $self->x_resource ("%.expr")
783	or return;	945	or return;
784		946
		947	$self->has_render
		948	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";
		949
785	$self->set_expr (parse_expr $expr);	950	$self->set_expr (parse_expr $expr);
786	$self->{border} = $self->x_resource_boolean ("background.border");	951	$self->{border} = $self->x_resource_boolean ("%.border");
		952
		953	$MIN_INTERVAL = $self->x_resource ("%.interval");
787		954
788	()	955	()
789	}	956	}
790		957

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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 1.56 by root, Thu Jun 14 17:06:57 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 1.56 by root, Thu Jun 14 17:06:57 2012 UTC