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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.48 by root, Sun Jun 10 15:01:14 2012 UTC vs.
Revision 1.63 by root, Tue Jun 19 18:17:56 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	#:META:X_RESOURCE:%.interval:seconds:minimum time between updates	5	#:META:X_RESOURCE:%.interval:seconds:minimum time between updates
6
7	#TODO: once, rootalign
8		6
9	=head1 NAME	7	=head1 NAME
10		8
11	background - manage terminal background	9	background - manage terminal background
12		10
59		57
60	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
61	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
62	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
63	example. That ensures that the picture always fills the terminal, even	61	example. That ensures that the picture always fills the terminal, even
64	after it's size changes.	62	after its size changes.
65		63
66	=head2 EXPRESSIONS	64	=head2 EXPRESSIONS
67		65
68	Expressions are normal Perl expressions, in fact, they are Perl blocks -	66	Expressions are normal Perl expressions, in fact, they are Perl blocks -
69	which means you could use multiple lines and statements:	67	which means you could use multiple lines and statements:
…		…
73	return scale load "$HOME/weekday.png";	71	return scale load "$HOME/weekday.png";
74	} else {	72	} else {
75	return scale load "$HOME/sunday.png";	73	return scale load "$HOME/sunday.png";
76	}	74	}
77		75
78	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
79	background on Sundays, and F<weekday.png> on all other days.	77	background on Sundays, and F<weekday.png> on all other days.
80		78
81	Fortunately, we expect that most expressions will be much simpler, with	79	Fortunately, we expect that most expressions will be much simpler, with
82	little Perl knowledge needed.	80	little Perl knowledge needed.
83		81
…		…
117	horizontal and vertical dimensions. For example, this halves the image	115	horizontal and vertical dimensions. For example, this halves the image
118	width and doubles the image height:	116	width and doubles the image height:
119		117
120	scale 0.5, 2, load "$HOME/mypic.png"	118	scale 0.5, 2, load "$HOME/mypic.png"
121		119
122	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
123	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:
124		122
125	tile load "$HOME/mypic.png"	123	tile load "$HOME/mypic.png"
126		124
127	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
…		…
140	pseudo-transparency, as the image seems to be static while the window is	138	pseudo-transparency, as the image seems to be static while the window is
141	moved around.	139	moved around.
142		140
143	=head2 CYCLES AND CACHING	141	=head2 CYCLES AND CACHING
144		142
		143	=head3 C<load> et al.
		144
145	As has been mentioned before, the expression might be evaluated multiple	145	As has been mentioned before, the expression might be evaluated multiple
146	times. Each time the expression is reevaluated, a new cycle is said to	146	times. Each time the expression is reevaluated, a new cycle is said to
147	have begun. Many operators cache their results till the next cycle.	147	have begun. Many operators cache their results till the next cycle.
148		148
149	For example, the C<load> operator keeps a copy of the image. If it is	149	For example, the C<load> operator keeps a copy of the image. If it is
…		…
153	This only works for one cycle though, so as long as you load the same	153	This only works for one cycle though, so as long as you load the same
154	image every time, it will always be cached, but when you load a different	154	image every time, it will always be cached, but when you load a different
155	image, it will forget about the first one.	155	image, it will forget about the first one.
156		156
157	This allows you to either speed things up by keeping multiple images in	157	This allows you to either speed things up by keeping multiple images in
158	memory, or comserve memory by loading images more often.	158	memory, or conserve memory by loading images more often.
159		159
160	For example, you can keep two images in memory and use a random one like	160	For example, you can keep two images in memory and use a random one like
161	this:	161	this:
162		162
163	my $img1 = load "img1.png";	163	my $img1 = load "img1.png";
…		…
173		173
174	Here, a path is selected randomly, and load is only called for one image,	174	Here, a path is selected randomly, and load is only called for one image,
175	so keeps only one image in memory. If, on the next evaluation, luck	175	so keeps only one image in memory. If, on the next evaluation, luck
176	decides to use the other path, then it will have to load that image again.	176	decides to use the other path, then it will have to load that image again.
177		177
		178	=head3 C<once { ... }>
		179
		180	Another way to cache expensive operations is to use C<once { ... }>. The
		181	C<once> operator takes a block of multiple statements enclosed by C<{}>
		182	and evaluates it only.. once, returning any images the last statement
		183	returned. Further calls simply produce the values from the cache.
		184
		185	This is most useful for expensive operations, such as C<blur>:
		186
		187	rootalign once { blur 20, root }
		188
		189	This makes a blurred copy of the root background once, and on subsequent
		190	calls, just root-aligns it. Since C<blur> is usually quite slow and
		191	C<rootalign> is quite fast, this trades extra memory (For the cached
		192	blurred pixmap) with speed (blur only needs to be redone when root
		193	changes).
		194
178	=head1 REFERENCE	195	=head1 REFERENCE
179		196
180	=head2 COMMAND LINE SWITCHES	197	=head2 COMMAND LINE SWITCHES
181		198
182	=over 4	199	=over 4
…		…
193	Specifying this flag changes the behaviour, so that the image only	210	Specifying this flag changes the behaviour, so that the image only
194	replaces the background of the character area.	211	replaces the background of the character area.
195		212
196	=item --background-interval seconds	213	=item --background-interval seconds
197		214
198	Since some operations in the underlying XRender extension can effetively	215	Since some operations in the underlying XRender extension can effectively
199	freeze your X-server for prolonged time, this extension enforces a minimum	216	freeze your X-server for prolonged time, this extension enforces a minimum
200	time between updates, which is normally about 0.1 seconds.	217	time between updates, which is normally about 0.1 seconds.
201		218
202	If you want to do updates more often, you can decrease this safety	219	If you want to do updates more often, you can decrease this safety
203	interval with this switch.	220	interval with this switch.
204		221
205	=back	222	=back
206		223
207	=cut	224	=cut
208		225
		226	our %_IMG_CACHE;
209	our $HOME;	227	our $HOME;
210	our ($self, $old, $new);	228	our ($self, $frame);
211	our ($x, $y, $w, $h);	229	our ($x, $y, $w, $h);
212		230
213	# enforce at least this interval between updates	231	# enforce at least this interval between updates
214	our $MIN_INTERVAL = 6/59.951;	232	our $MIN_INTERVAL = 6/59.951;
215		233
216	{	234	{
217	package urxvt::bgdsl; # background language	235	package urxvt::bgdsl; # background language
		236
		237	sub FR_PARENT() { 0 } # parent frame, if any - must be #0
		238	sub FR_CACHE () { 1 } # cached values
		239	sub FR_AGAIN () { 2 } # what this expr is sensitive to
		240	sub FR_STATE () { 3 } # watchers etc.
218		241
219	use List::Util qw(min max sum shuffle);	242	use List::Util qw(min max sum shuffle);
220		243
221	=head2 PROVIDERS/GENERATORS	244	=head2 PROVIDERS/GENERATORS
222		245
…		…
229	=item load $path	252	=item load $path
230		253
231	Loads the image at the given C<$path>. The image is set to plane tiling	254	Loads the image at the given C<$path>. The image is set to plane tiling
232	mode.	255	mode.
233		256
234	Loaded images will be cached for one cycle.	257	Loaded images will be cached for one cycle, and shared between temrinals
		258	running in the same process (e.g. in C<urxvtd>).
		259
		260	#=item load_uc $path
		261	#
		262	#Load uncached - same as load, but does not cache the image. This function
		263	#is most useufl if you want to optimise a background expression in some
		264	#way.
235		265
236	=cut	266	=cut
237		267
238	sub load($) {	268	sub load($) {
239	my ($path) = @_;	269	my ($path) = @_;
240		270
241	$new->{load}{$path} = $old->{load}{$path} \|\| $self->new_img_from_file ($path);	271	$_IMG_CACHE{$path} \|\| do {
		272	my $img = $self->new_img_from_file ($path);
		273	Scalar::Util::weaken ($_IMG_CACHE{$path} = $img);
		274	$img
		275	}
242	}	276	}
243		277
244	=item root	278	=item root
245		279
246	Returns the root window pixmap, that is, hopefully, the background image	280	Returns the root window pixmap, that is, hopefully, the background image
247	of your screen. The image is set to extend mode.	281	of your screen.
248		282
249	This function makes your expression root sensitive, that means it will be	283	This function makes your expression root sensitive, that means it will be
250	reevaluated when the bg image changes.	284	reevaluated when the bg image changes.
251		285
252	=cut	286	=cut
253		287
254	sub root() {	288	sub root() {
255	$new->{rootpmap_sensitive} = 1;	289	$frame->[FR_AGAIN]{rootpmap} = 1;
256	die "root op not supported, exg, we need you";	290	$self->new_img_from_root
257	}	291	}
258		292
259	=item solid $colour	293	=item solid $colour
260		294
261	=item solid $width, $height, $colour	295	=item solid $width, $height, $colour
…		…
269	=cut	303	=cut
270		304
271	sub solid($;$$) {	305	sub solid($;$$) {
272	my $colour = pop;	306	my $colour = pop;
273		307
274	my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] \|\| 1, $_[1] \|\| 1);	308	my $img = $self->new_img (urxvt::PictStandardARGB32, 0, 0, $_[0] \|\| 1, $_[1] \|\| 1);
275	$img->fill ($colour);	309	$img->fill ($colour);
276	$img	310	$img
277	}	311	}
278		312
279	=item clone $img	313	=item clone $img
…		…
285		319
286	sub clone($) {	320	sub clone($) {
287	$_[0]->clone	321	$_[0]->clone
288	}	322	}
289		323
290	=back	324	=item merge $img ...
		325
		326	Takes any number of images and merges them together, creating a single
		327	image containing them all. The tiling mode of the first image is used as
		328	the tiling mdoe of the resulting image.
		329
		330	This function is called automatically when an expression returns multiple
		331	images.
		332
		333	=cut
		334
		335	sub merge(@) {
		336	return $_[0] unless $#_;
		337
		338	# rather annoyingly clumsy, but optimisation is for another time
		339
		340	my $x0 = +1e9;
		341	my $y0 = +1e9;
		342	my $x1 = -1e9;
		343	my $y1 = -1e9;
		344
		345	for (@_) {
		346	my ($x, $y, $w, $h) = $_->geometry;
		347
		348	$x0 = $x if $x0 > $x;
		349	$y0 = $y if $y0 > $y;
		350
		351	$x += $w;
		352	$y += $h;
		353
		354	$x1 = $x if $x1 < $x;
		355	$y1 = $y if $y1 < $y;
		356	}
		357
		358	my $base = $self->new_img (urxvt::PictStandardARGB32, $x0, $y0, $x1 - $x0, $y1 - $y0);
		359	$base->repeat_mode ($_[0]->repeat_mode);
		360	$base->fill ([0, 0, 0, 0]);
		361
		362	$base->draw ($_)
		363	for @_;
		364
		365	$base
		366	}
291		367
292	=head2 TILING MODES	368	=head2 TILING MODES
293		369
294	The following operators modify the tiling mode of an image, that is, the	370	The following operators modify the tiling mode of an image, that is, the
295	way that pixels outside the image area are painted when the image is used.	371	way that pixels outside the image area are painted when the image is used.
…		…
325	become transparent. This mode is most useful when you want to place an	401	become transparent. This mode is most useful when you want to place an
326	image over another image or the background colour while leaving all	402	image over another image or the background colour while leaving all
327	background pixels outside the image unchanged.	403	background pixels outside the image unchanged.
328		404
329	Example: load an image and display it in the upper left corner. The rest	405	Example: load an image and display it in the upper left corner. The rest
330	of the space is left "empty" (transparent or wahtever your compisotr does	406	of the space is left "empty" (transparent or whatever your compositor does
331	in alpha mode, else background colour).	407	in alpha mode, else background colour).
332		408
333	pad load "mybg.png"	409	pad load "mybg.png"
334		410
335	=item extend $img	411	=item extend $img
336		412
337	Extends the image over the whole plane, using the closest pixel in the	413	Extends the image over the whole plane, using the closest pixel in the
338	area outside the image. This mode is mostly useful when you more complex	414	area outside the image. This mode is mostly useful when you use more complex
339	filtering operations and want the pixels outside the image to have the	415	filtering operations and want the pixels outside the image to have the
340	same values as the pixels near the edge.	416	same values as the pixels near the edge.
341		417
342	Example: just for curiosity, how does this pixel extension stuff work?	418	Example: just for curiosity, how does this pixel extension stuff work?
343		419
…		…
410	the window size to conserve memory.	486	the window size to conserve memory.
411		487
412	Example: take the screen background, clip it to the window size, blur it a	488	Example: take the screen background, clip it to the window size, blur it a
413	bit, align it to the window position and use it as background.	489	bit, align it to the window position and use it as background.
414		490
415	clip move -TX, -TY, blur 5, root	491	clip move -TX, -TY, once { blur 5, root }
416		492
417	=cut	493	=cut
418		494
419	sub TX() { $new->{position_sensitive} = 1; $x }	495	sub TX() { $frame->[FR_AGAIN]{position} = 1; $x }
420	sub TY() { $new->{position_sensitive} = 1; $y }	496	sub TY() { $frame->[FR_AGAIN]{position} = 1; $y }
421	sub TW() { $new->{size_sensitive} = 1; $w }	497	sub TW() { $frame->[FR_AGAIN]{size} = 1; $w }
422	sub TH() { $new->{size_sensitive} = 1; $h }	498	sub TH() { $frame->[FR_AGAIN]{size} = 1; $h }
423		499
424	=item now	500	=item now
425		501
426	Returns the current time as (fractional) seconds since the epoch.	502	Returns the current time as (fractional) seconds since the epoch.
427		503
…		…
434	C<$seconds> seconds.	510	C<$seconds> seconds.
435		511
436	Example: load some image and rotate it according to the time of day (as if it were	512	Example: load some image and rotate it according to the time of day (as if it were
437	the hour pointer of a clock). Update this image every minute.	513	the hour pointer of a clock). Update this image every minute.
438		514
439	again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"	515	again 60; rotate 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"
440		516
441	=item counter $seconds	517	=item counter $seconds
442		518
443	Like C<again>, but also returns an increasing counter value, starting at	519	Like C<again>, but also returns an increasing counter value, starting at
444	0, which might be useful for some simple animation effects.	520	0, which might be useful for some simple animation effects.
…		…
446	=cut	522	=cut
447		523
448	sub now() { urxvt::NOW }	524	sub now() { urxvt::NOW }
449		525
450	sub again($) {	526	sub again($) {
451	$new->{again} = $_[0];	527	$frame->[FR_AGAIN]{time} = $_[0];
452	}	528	}
453		529
454	sub counter($) {	530	sub counter($) {
455	$new->{again} = $_[0];	531	$frame->[FR_AGAIN]{time} = $_[0];
456	$self->{counter} + 0	532	$frame->[FR_STATE]{counter} + 0
457	}	533	}
458		534
459	=back	535	=back
460		536
461	=head2 SHAPE CHANGING OPERATORS	537	=head2 SHAPE CHANGING OPERATORS
…		…
631		707
632	sub rootalign($) {	708	sub rootalign($) {
633	move -TX, -TY, $_[0]	709	move -TX, -TY, $_[0]
634	}	710	}
635		711
		712	=item rotate $center_x, $center_y, $degrees
		713
		714	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
		715	pointer at C<$center_x> and C<$center_y> (specified as factor of image
		716	width/height).
		717
		718	#TODO# new width, height, maybe more operators?
		719
		720	Example: rotate the image by 90 degrees
		721
		722	=cut
		723
		724	sub rotate($$$$) {
		725	my $img = pop;
		726	$img->rotate (
		727	$_[0] * ($img->w + $img->x),
		728	$_[1] * ($img->h + $img->y),
		729	$_[2] * (3.14159265 / 180),
		730	)
		731	}
		732
636	=back	733	=back
637		734
638	=head2 COLOUR MODIFICATIONS	735	=head2 COLOUR MODIFICATIONS
639		736
640	The following operators change the pixels of the image.	737	The following operators change the pixels of the image.
…		…
674		771
675	Values less than 0 reduce brightness, while values larger than 0 increase	772	Values less than 0 reduce brightness, while values larger than 0 increase
676	it. Useful range is from -1 to 1 - the former results in a black, the	773	it. Useful range is from -1 to 1 - the former results in a black, the
677	latter in a white picture.	774	latter in a white picture.
678		775
679	Due to idiosynchrasies in the underlying XRender extension, biases less	776	Due to idiosyncrasies in the underlying XRender extension, biases less
680	than zero can be I<very> slow.	777	than zero can be I<very> slow.
681		778
682	=cut	779	=cut
683		780
684	sub contrast($$;$$;$) {	781	sub contrast($$;$$;$) {
685	my $img = pop;	782	my $img = pop;
686	my ($r, $g, $b, $a) = @_;	783	my ($r, $g, $b, $a) = @_;
687		784
688	($g, $b) = ($r, $r) if @_ < 4;	785	($g, $b) = ($r, $r) if @_ < 3;
689	$a = 1 if @_ < 5;	786	$a = 1 if @_ < 4;
690		787
691	$img = $img->clone;	788	$img = $img->clone;
692	$img->contrast ($r, $g, $b, $a);	789	$img->contrast ($r, $g, $b, $a);
693	$img	790	$img
694	}	791	}
695		792
696	sub brightness($$;$$;$) {	793	sub brightness($$;$$;$) {
697	my $img = pop;	794	my $img = pop;
698	my ($r, $g, $b, $a) = @_;	795	my ($r, $g, $b, $a) = @_;
699		796
700	($g, $b) = ($r, $r) if @_ < 4;	797	($g, $b) = ($r, $r) if @_ < 3;
701	$a = 1 if @_ < 5;	798	$a = 1 if @_ < 4;
702		799
703	$img = $img->clone;	800	$img = $img->clone;
704	$img->brightness ($r, $g, $b, $a);	801	$img->brightness ($r, $g, $b, $a);
705	$img	802	$img
706	}	803	}
…		…
722	sub blur($$;$) {	819	sub blur($$;$) {
723	my $img = pop;	820	my $img = pop;
724	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])	821	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
725	}	822	}
726		823
727	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees
728
729	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
730	pointer at C<$center_x> and C<$center_y> (specified as factor of image
731	width/height), generating a new image with width C<$new_width> and height
732	C<$new_height>.
733
734	#TODO# new width, height, maybe more operators?
735
736	Example: rotate the image by 90 degrees
737
738	=cut
739
740	sub rotate($$$$$$) {
741	my $img = pop;
742	$img->rotate (
743	$_[0],
744	$_[1],
745	$_[2] * $img->w,
746	$_[3] * $img->h,
747	$_[4] * (3.14159265 / 180),
748	)
749	}
750
751	=back	824	=back
752		825
		826	=head2 OTHER STUFF
		827
		828	Anything that didn't fit any of the other categories, even after applying
		829	force and closing our eyes.
		830
		831	=over 4
		832
		833	=item once { ... }
		834
		835	This function takes a code block as argument, that is, one or more
		836	statements enclosed by braces.
		837
		838	The trick is that this code block is only evaluated once - future calls
		839	will simply return the original image (yes, it should only be used with
		840	images).
		841
		842	This can be extremely useful to avoid redoing the same slow operations
		843	again and again- for example, if your background expression takes the root
		844	background, blurs it and then root-aligns it it would have to blur the
		845	root background on every window move or resize.
		846
		847	In fact, urxvt itself encloses the whole expression in some kind of
		848	C<once> block so it only is reevaluated as required.
		849
		850	Putting the blur into a C<once> block will make sure the blur is only done
		851	once:
		852
		853	rootlign once { blur 10, root }
		854
		855	This leaves the question of how to force reevaluation of the block,
		856	in case the root background changes: If expression inside the block
		857	is sensitive to some event (root background changes, window geometry
		858	changes), then it will be reevaluated automatically as needed.
		859
		860	=item once_again
		861
		862	Resets all C<once> block as if they had never been called, i.e. on the
		863	next call they will be reevaluated again.
		864
		865	=cut
		866
		867	sub once(&) {
		868	my $id = $_[0]+0;
		869
		870	local $frame = $self->{frame_cache}{$id} \|\|= [$frame];
		871
		872	unless ($frame->[FR_CACHE]) {
		873	$frame->[FR_CACHE] = [ $_[0]() ];
		874
		875	my $self = $self;
		876	my $frame = $frame;
		877	Scalar::Util::weaken $frame;
		878	$self->compile_frame ($frame, sub {
		879	# clear this frame cache, also for all parents
		880	for (my $frame = $frame; $frame; $frame = $frame->[0]) {
		881	undef $frame->[FR_CACHE];
		882	}
		883
		884	unless ($self->{term}) {
		885	use Data::Dump;
		886	ddx $frame;
		887	exit;
		888	}
		889
		890	$self->recalculate;
		891	});
		892	};
		893
		894	# in scalar context we always return the first original result, which
		895	# is not quite how perl works.
		896	wantarray
		897	? @{ $frame->[FR_CACHE] }
		898	: $frame->[FR_CACHE][0]
		899	}
		900
		901	sub once_again() {
		902	delete $self->{frame_cache};
		903	}
		904
		905	=back
		906
753	=cut	907	=cut
754		908
755	}	909	}
756		910
757	sub parse_expr {	911	sub parse_expr {
758	my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}";	912	my $expr = eval
		913	"sub {\n"
		914	. "package urxvt::bgdsl;\n"
		915	. "#line 0 'background expression'\n"
		916	. "$_[0]\n"
		917	. "}";
759	die if $@;	918	die if $@;
760	$expr	919	$expr
761	}	920	}
762		921
763	# compiles a parsed expression	922	# compiles a parsed expression
764	sub set_expr {	923	sub set_expr {
765	my ($self, $expr) = @_;	924	my ($self, $expr) = @_;
766		925
		926	$self->{root} = [];
767	$self->{expr} = $expr;	927	$self->{expr} = $expr;
768	$self->recalculate;	928	$self->recalculate;
		929	}
		930
		931	# takes a hash of sensitivity indicators and installs watchers
		932	sub compile_frame {
		933	my ($self, $frame, $cb) = @_;
		934
		935	my $state = $frame->[urxvt::bgdsl::FR_STATE] \|\|= {};
		936	my $again = $frame->[urxvt::bgdsl::FR_AGAIN];
		937
		938	# don't keep stuff alive
		939	Scalar::Util::weaken $state;
		940
		941	if ($again->{nested}) {
		942	$state->{nested} = 1;
		943	} else {
		944	delete $state->{nested};
		945	}
		946
		947	if (my $interval = $again->{time}) {
		948	$state->{time} = [$interval, urxvt::timer->new->after ($interval)->interval ($interval)]
		949	if $state->{time}[0] != $interval;
		950
		951	# callback might have changed, although we could just rule that out
		952	$state->{time}[1]->cb (sub {
		953	++$state->{counter};
		954	$cb->();
		955	});
		956	} else {
		957	delete $state->{time};
		958	}
		959
		960	if ($again->{position}) {
		961	$state->{position} = $self->on (position_change => $cb);
		962	} else {
		963	delete $state->{position};
		964	}
		965
		966	if ($again->{size}) {
		967	$state->{size} = $self->on (size_change => $cb);
		968	} else {
		969	delete $state->{size};
		970	}
		971
		972	if ($again->{rootpmap}) {
		973	$state->{rootpmap} = $self->on (rootpmap_change => $cb);
		974	} else {
		975	delete $state->{rootpmap};
		976	}
769	}	977	}
770		978
771	# evaluate the current bg expression	979	# evaluate the current bg expression
772	sub recalculate {	980	sub recalculate {
773	my ($arg_self) = @_;	981	my ($arg_self) = @_;
…		…
783		991
784	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;	992	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;
785		993
786	# set environment to evaluate user expression	994	# set environment to evaluate user expression
787		995
788	local $self = $arg_self;	996	local $self = $arg_self;
789
790	local $HOME = $ENV{HOME};	997	local $HOME = $ENV{HOME};
791	local $old = $self->{state};	998	local $frame = [];
792	local $new = my $state = $self->{state} = {};
793		999
794	($x, $y, $w, $h) =
795	$self->background_geometry ($self->{border});	1000	($x, $y, $w, $h) = $self->background_geometry ($self->{border});
796		1001
797	# evaluate user expression	1002	# evaluate user expression
798		1003
799	my $img = eval { $self->{expr}->() };	1004	my @img = eval { $self->{expr}->() };
800	warn $@ if $@;#d#	1005	die $@ if $@;
801	die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img";	1006	die "background-expr did not return anything.\n" unless @img;
		1007	die "background-expr: expected image(s), got something else.\n"
		1008	if grep { !UNIVERSAL::isa $_, "urxvt::img" } @img;
802		1009
803	$state->{size_sensitive} = 1	1010	my $img = urxvt::bgdsl::merge @img;
		1011
		1012	$frame->[FR_AGAIN]{size} = 1
804	if $img->repeat_mode != urxvt::RepeatNormal;	1013	if $img->repeat_mode != urxvt::RepeatNormal;
805		1014
806	# if the expression is sensitive to external events, prepare reevaluation then	1015	# if the expression is sensitive to external events, prepare reevaluation then
807		1016	$self->compile_frame ($frame, sub { $arg_self->recalculate });
808	my $repeat;
809
810	if (my $again = $state->{again}) {
811	$repeat = 1;
812	my $self = $self;
813	$state->{timer} = $again == $old->{again}
814	? $old->{timer}
815	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
816	++$self->{counter};
817	$self->recalculate
818	});
819	}
820
821	if (delete $state->{position_sensitive}) {
822	$repeat = 1;
823	$self->enable (position_change => sub { $_[0]->recalculate });
824	} else {
825	$self->disable ("position_change");
826	}
827
828	if (delete $state->{size_sensitive}) {
829	$repeat = 1;
830	$self->enable (size_change => sub { $_[0]->recalculate });
831	} else {
832	$self->disable ("size_change");
833	}
834
835	if (delete $state->{rootpmap_sensitive}) {
836	$repeat = 1;
837	$self->enable (rootpmap_change => sub { $_[0]->recalculate });
838	} else {
839	$self->disable ("rootpmap_change");
840	}
841		1017
842	# clear stuff we no longer need	1018	# clear stuff we no longer need
843		1019
844	%$old = ();	1020	# unless (%{ $frame->[FR_STATE] }) {
845
846	unless ($repeat) {
847	delete $self->{state};	1021	# delete $self->{state};
848	delete $self->{expr};	1022	# delete $self->{expr};
849	}	1023	# }
850		1024
851	# set background pixmap	1025	# set background pixmap
852		1026
853	$self->set_background ($img, $self->{border});	1027	$self->set_background ($img, $self->{border});
854	$self->scr_recolour (0);	1028	$self->scr_recolour (0);

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.48 by root, Sun Jun 10 15:01:14 2012 UTC vs. Revision 1.63 by root, Tue Jun 19 18:17:56 2012 UTC

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Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.48 by root, Sun Jun 10 15:01:14 2012 UTC vs.
Revision 1.63 by root, Tue Jun 19 18:17:56 2012 UTC