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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.13 by root, Tue Jun 5 19:32:29 2012 UTC vs.
Revision 1.40 by root, Fri Jun 8 22:19:21 2012 UTC

…		…
1	#! perl	1	#! perl
2		2
3	#:META:RESOURCE:$$:string:background expression	3	#:META:X_RESOURCE:%.expr:string:background expression
		4	#:META:X_RESOURCE:%.border.:boolean:respect the terminal border
4		5
5	our $EXPR = 'move load "/root/pix/das_fette_schwein.jpg", repeat_wrap, X, Y';	6	#TODO: once, rootalign
6	$EXPR = '
7	rotate W, H, 50, 50, counter 1/59.95, repeat_mirror,
8	clip X, Y, W, H, repeat_mirror,
9	load "/root/pix/das_fette_schwein.jpg"
10	';
11	#$EXPR = 'blur root, 10, 10'
12	#$EXPR = 'blur move (root, -x, -y), 5, 5'
13	#resize load "/root/pix/das_fette_schwein.jpg", w, h
14		7
15	use Safe;	8	=head1 background - manage terminal background
16		9
		10	=head2 SYNOPSIS
		11
		12	urxvt --background-expr 'background expression'
		13	--background-border
		14
		15	=head2 DESCRIPTION
		16
		17	This extension manages the terminal background by creating a picture that
		18	is behind the text, replacing the normal background colour.
		19
		20	It does so by evaluating a Perl expression that I<calculates> the image on
		21	the fly, for example, by grabbing the root background or loading a file.
		22
		23	While the full power of Perl is available, the operators have been design
		24	to be as simple as possible.
		25
		26	For example, to load an image and scale it to the window size, you would
		27	use:
		28
		29	urxvt --background-expr 'scale load "/path/to/mybg.png"'
		30
		31	Or specified as a X resource:
		32
		33	URxvt.background-expr: scale load "/path/to/mybg.png"
		34
		35	=head2 THEORY OF OPERATION
		36
		37	At startup, just before the window is mapped for the first time, the
		38	expression is evaluated and must yield an image. The image is then
		39	extended as necessary to cover the whole terminal window, and is set as a
		40	background pixmap.
		41
		42	If the image contains an alpha channel, then it will be used as-is in
		43	visuals that support alpha channels (for example, for a compositing
		44	manager). In other visuals, the terminal background colour will be used to
		45	replace any transparency.
		46
		47	When the expression relies, directly or indirectly, on the window size,
		48	position, the root pixmap, or a timer, then it will be remembered. If not,
		49	then it will be removed.
		50
		51	If any of the parameters that the expression relies on changes (when the
		52	window is moved or resized, its position or size changes; when the root
		53	pixmap is replaced by another one the root background changes; or when the
		54	timer elapses), then the expression will be evaluated again.
		55
		56	For example, an expression such as C<scale load "$HOME/mybg.png"> scales the
		57	image to the window size, so it relies on the window size and will
		58	be reevaluated each time it is changed, but not when it moves for
		59	example. That ensures that the picture always fills the terminal, even
		60	after it's size changes.
		61
		62	=head3 EXPRESSIONS
		63
		64	Expressions are normal Perl expressions, in fact, they are Perl blocks -
		65	which means you could use multiple lines and statements:
		66
		67	again 3600;
		68	if (localtime now)[6]) {
		69	return scale load "$HOME/weekday.png";
		70	} else {
		71	return scale load "$HOME/sunday.png";
		72	}
		73
		74	This expression gets evaluated once per hour. It will set F<sunday.png> as
		75	background on Sundays, and F<weekday.png> on all other days.
		76
		77	Fortunately, we expect that most expressions will be much simpler, with
		78	little Perl knowledge needed.
		79
		80	Basically, you always start with a function that "generates" an image
		81	object, such as C<load>, which loads an image from disk, or C<root>, which
		82	returns the root window background image:
		83
		84	load "$HOME/mypic.png"
		85
		86	The path is usually specified as a quoted string (the exact rules can be
		87	found in the L<perlop> manpage). The F<$HOME> at the beginning of the
		88	string is expanded to the home directory.
		89
		90	Then you prepend one or more modifiers or filtering expressions, such as
		91	C<scale>:
		92
		93	scale load "$HOME/mypic.png"
		94
		95	Just like a mathematical expression with functions, you should read these
		96	expressions from right to left, as the C<load> is evaluated first, and
		97	its result becomes the argument to the C<scale> function.
		98
		99	Many operators also allow some parameters preceding the input image
		100	that modify its behaviour. For example, C<scale> without any additional
		101	arguments scales the image to size of the terminal window. If you specify
		102	an additional argument, it uses it as a percentage:
		103
		104	scale 200, load "$HOME/mypic.png"
		105
		106	This enlarges the image by a factor of 2 (200%). As you can see, C<scale>
		107	has now two arguments, the C<200> and the C<load> expression, while
		108	C<load> only has one argument. Arguments are separated from each other by
		109	commas.
		110
		111	Scale also accepts two arguments, which are then separate factors for both
		112	horizontal and vertical dimensions. For example, this halves the image
		113	width and doubles the image height:
		114
		115	scale 50, 200, load "$HOME/mypic.png"
		116
		117	Other effects than scalign are also readily available, for exmaple, you can
		118	tile the image to fill the whole window, instead of resizing it:
		119
		120	tile load "$HOME/mypic.png"
		121
		122	In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator
		123	is kind of superfluous.
		124
		125	Another common effect is to mirror the image, so that the same edges touch:
		126
		127	mirror load "$HOME/mypic.png"
		128
		129	This is also a typical background expression:
		130
		131	rootalign root
		132
		133	It first takes a snapshot of the screen background image, and then
		134	moves it to the upper left corner of the screen - the result is
		135	pseudo-transparency, as the image seems to be static while the window is
		136	moved around.
		137
		138	=head3 CYCLES AND CACHING
		139
		140	As has been mentioned before, the expression might be evaluated multiple
		141	times. Each time the expression is reevaluated, a new cycle is said to
		142	have begun. Many operators cache their results till the next cycle.
		143
		144	For example, the C<load> operator keeps a copy of the image. If it is
		145	asked to load the same image on the next cycle it will not load it again,
		146	but return the cached copy.
		147
		148	This only works for one cycle though, so as long as you load the same
		149	image every time, it will always be cached, but when you load a different
		150	image, it will forget about the first one.
		151
		152	This allows you to either speed things up by keeping multiple images in
		153	memory, or comserve memory by loading images more often.
		154
		155	For example, you can keep two images in memory and use a random one like
		156	this:
		157
		158	my $img1 = load "img1.png";
		159	my $img2 = load "img2.png";
		160	(0.5 > rand) ? $img1 : $img2
		161
		162	Since both images are "loaded" every time the expression is evaluated,
		163	they are always kept in memory. Contrast this version:
		164
		165	my $path1 = "img1.png";
		166	my $path2 = "img2.png";
		167	load ((0.5 > rand) ? $path1 : $path2)
		168
		169	Here, a path is selected randomly, and load is only called for one image,
		170	so keeps only one image in memory. If, on the next evaluation, luck
		171	decides to use the other path, then it will have to load that image again.
		172
		173	=head2 REFERENCE
		174
		175	=head3 COMMAND LINE SWITCHES
		176
		177	=over 4
		178
		179	=item --background-expr perl-expression
		180
		181	Specifies the Perl expression to evaluate.
		182
		183	=item --background-border
		184
		185	By default, the expression creates an image that fills the full window,
		186	overwriting borders and any other areas, such as the scrollbar.
		187
		188	Specifying this flag changes the behaviour, so that the image only
		189	replaces the background of the character area.
		190
		191	=back
		192
		193	=cut
		194
		195	our $HOME;
17	our ($bgdsl_self, $old, $new);	196	our ($self, $old, $new);
18	our ($l, $t, $w, $h);	197	our ($x, $y, $w, $h);
19		198
20	# enforce at leats this time between updates	199	# enforce at least this interval between updates
21	our $MIN_INTERVAL = 1/100;	200	our $MIN_INTERVAL = 1/100;
22		201
23	{	202	{
24	package urxvt::bgdsl; # background language	203	package urxvt::bgdsl; # background language
25		204
26	*repeat_black = \&urxvt::RepeatNone; #TODO wtf	205	=head2 PROVIDERS/GENERATORS
27	*repeat_wrap = \&urxvt::RepeatNormal;	206
28	*repeat_pad = \&urxvt::RepeatPad;	207	These functions provide an image, by loading it from disk, grabbing it
29	*repeat_mirror = \&urxvt::RepeatReflect;	208	from the root screen or by simply generating it. They are used as starting
		209	points to get an image you can play with.
		210
		211	=over 4
		212
		213	=item load $path
		214
		215	Loads the image at the given C<$path>. The image is set to plane tiling
		216	mode.
		217
		218	Loaded images will be cached for one cycle.
		219
		220	=cut
30		221
31	sub load($) {	222	sub load($) {
32	my ($path) = @_;	223	my ($path) = @_;
33		224
34	$new->{load}{$path} = $old->{load}{$path} \|\| $bgdsl_self->new_img_from_file ($path);	225	$new->{load}{$path} = $old->{load}{$path} \|\| $self->new_img_from_file ($path);
35	}	226	}
		227
		228	=item root
		229
		230	Returns the root window pixmap, that is, hopefully, the background image
		231	of your screen. The image is set to extend mode.
		232
		233	This function makes your expression root sensitive, that means it will be
		234	reevaluated when the bg image changes.
		235
		236	=cut
36		237
37	sub root() {	238	sub root() {
38	$new->{rootpmap_sensitive} = 1;	239	$new->{rootpmap_sensitive} = 1;
39	die "root op not supported, exg, we need you";	240	die "root op not supported, exg, we need you";
40	}	241	}
41		242
		243	=item solid $colour
		244
		245	=item solid $width, $height, $colour
		246
		247	Creates a new image and completely fills it with the given colour. The
		248	image is set to tiling mode.
		249
		250	If C<$width> and C<$height> are omitted, it creates a 1x1 image, which is
		251	useful for solid backgrounds or for use in filtering effects.
		252
		253	=cut
		254
		255	sub solid($$;$) {
		256	my $colour = pop;
		257
		258	my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] \|\| 1, $_[1] \|\| 1);
		259	$img->fill ($colour);
		260	$img
		261	}
		262
		263	=back
		264
		265	=head2 VARIABLES
		266
		267	The following functions provide variable data such as the terminal
		268	window dimensions. Most of them make your expression sensitive to some
		269	events, for example using C<TW> (terminal width) means your expression is
		270	evaluated again when the terminal is resized.
		271
		272	=over 4
		273
		274	=item TX
		275
		276	=item TY
		277
		278	Return the X and Y coordinates of the terminal window (the terminal
		279	window is the full window by default, and the character area only when in
		280	border-respect mode).
		281
		282	Using these functions make your expression sensitive to window moves.
		283
		284	These functions are mainly useful to align images to the root window.
		285
		286	Example: load an image and align it so it looks as if anchored to the
		287	background.
		288
		289	move -TX, -TY, load "mybg.png"
		290
		291	=item TW
		292
		293	Return the width (C<TW>) and height (C<TH>) of the terminal window (the
		294	terminal window is the full window by default, and the character area only
		295	when in border-respect mode).
		296
		297	Using these functions make your expression sensitive to window resizes.
		298
		299	These functions are mainly useful to scale images, or to clip images to
		300	the window size to conserve memory.
		301
		302	Example: take the screen background, clip it to the window size, blur it a
		303	bit, align it to the window position and use it as background.
		304
		305	clip move -TX, -TY, blur 5, root
		306
		307	=cut
		308
		309	sub TX() { $new->{position_sensitive} = 1; $x }
		310	sub TY() { $new->{position_sensitive} = 1; $y }
		311	sub TW() { $new->{size_sensitive} = 1; $w }
		312	sub TH() { $new->{size_sensitive} = 1; $h }
		313
		314	=item now
		315
		316	Returns the current time as (fractional) seconds since the epoch.
		317
		318	Using this expression does I<not> make your expression sensitive to time,
		319	but the next two functions do.
		320
		321	=item again $seconds
		322
		323	When this function is used the expression will be reevaluated again in
		324	C<$seconds> seconds.
		325
		326	Example: load some image and rotate it according to the time of day (as if it were
		327	the hour pointer of a clock). Update this image every minute.
		328
		329	again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"
		330
		331	=item counter $seconds
		332
		333	Like C<again>, but also returns an increasing counter value, starting at
		334	0, which might be useful for some simple animation effects.
		335
		336	=cut
		337
		338	sub now() { urxvt::NOW }
		339
		340	sub again($) {
		341	$new->{again} = $_[0];
		342	}
		343
		344	sub counter($) {
		345	$new->{again} = $_[0];
		346	$self->{counter} + 0
		347	}
		348
		349	=back
		350
		351	=head2 TILING MODES
		352
		353	The following operators modify the tiling mode of an image, that is, the
		354	way that pixels outside the image area are painted when the image is used.
		355
		356	=over 4
		357
		358	=item tile $img
		359
		360	Tiles the whole plane with the image and returns this new image - or in
		361	other words, it returns a copy of the image in plane tiling mode.
		362
		363	Example: load an image and tile it over the background, without
		364	resizing. The C<tile> call is superfluous because C<load> already defaults
		365	to tiling mode.
		366
		367	tile load "mybg.png"
		368
		369	=item mirror $img
		370
		371	Similar to tile, but reflects the image each time it uses a new copy, so
		372	that top edges always touch top edges, right edges always touch right
		373	edges and so on (with normal tiling, left edges always touch right edges
		374	and top always touch bottom edges).
		375
		376	Example: load an image and mirror it over the background, avoiding sharp
		377	edges at the image borders at the expense of mirroring the image itself
		378
		379	mirror load "mybg.png"
		380
		381	=item pad $img
		382
		383	Takes an image and modifies it so that all pixels outside the image area
		384	become transparent. This mode is most useful when you want to place an
		385	image over another image or the background colour while leaving all
		386	background pixels outside the image unchanged.
		387
		388	Example: load an image and display it in the upper left corner. The rest
		389	of the space is left "empty" (transparent or wahtever your compisotr does
		390	in alpha mode, else background colour).
		391
		392	pad load "mybg.png"
		393
		394	=item extend $img
		395
		396	Extends the image over the whole plane, using the closest pixel in the
		397	area outside the image. This mode is mostly useful when you more complex
		398	filtering operations and want the pixels outside the image to have the
		399	same values as the pixels near the edge.
		400
		401	Example: just for curiosity, how does this pixel extension stuff work?
		402
		403	extend move 50, 50, load "mybg.png"
		404
		405	=cut
		406
		407	sub pad($) {
		408	my $img = $_[0]->clone;
		409	$img->repeat_mode (urxvt::RepeatNone);
		410	$img
		411	}
		412
		413	sub tile($) {
		414	my $img = $_[0]->clone;
		415	$img->repeat_mode (urxvt::RepeatNormal);
		416	$img
		417	}
		418
		419	sub mirror($) {
		420	my $img = $_[0]->clone;
		421	$img->repeat_mode (urxvt::RepeatReflect);
		422	$img
		423	}
		424
		425	sub extend($) {
		426	my $img = $_[0]->clone;
		427	$img->repeat_mode (urxvt::RepeatPad);
		428	$img
		429	}
		430
		431	=back
		432
		433	=head2 PIXEL OPERATORS
		434
		435	The following operators modify the image pixels in various ways.
		436
		437	=over 4
		438
		439	=item clone $img
		440
		441	Returns an exact copy of the image.
		442
		443	=cut
		444
42	# sub clone($) {	445	sub clone($) {
43	# $_[0]->clone	446	$_[0]->clone
44	# }	447	}
45		448
		449	=item clip $img
		450
		451	=item clip $width, $height, $img
		452
		453	=item clip $x, $y, $width, $height, $img
		454
		455	Clips an image to the given rectangle. If the rectangle is outside the
		456	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is
		457	larger than the image, then the tiling mode defines how the extra pixels
		458	will be filled.
		459
		460	If C<$x> an C<$y> are missing, then C<0> is assumed for both.
		461
		462	If C<$width> and C<$height> are missing, then the window size will be
		463	assumed.
		464
		465	Example: load an image, blur it, and clip it to the window size to save
		466	memory.
		467
		468	clip blur 10, load "mybg.png"
		469
		470	=cut
		471
46	sub clip($$$$$;$) {	472	sub clip($;$$;$$) {
47	my $img = pop;	473	my $img = pop;
		474	my $h = pop \|\| TH;
		475	my $w = pop \|\| TW;
48	$img->sub_rect ($_[0], $_[1], $_[2], $_[3], $_[4])	476	$img->sub_rect ($_[0], $_[1], $w, $h)
		477	}
		478
		479	=item scale $img
		480
		481	=item scale $size_percent, $img
		482
		483	=item scale $width_percent, $height_percent, $img
		484
		485	Scales the image by the given percentages in horizontal
		486	(C<$width_percent>) and vertical (C<$height_percent>) direction.
		487
		488	If only one percentage is give, it is used for both directions.
		489
		490	If no percentages are given, scales the image to the window size without
		491	keeping aspect.
		492
		493	=item resize $width, $height, $img
		494
		495	Resizes the image to exactly C<$width> times C<$height> pixels.
		496
		497	=cut
		498
		499	#TODO: maximise, maximise_fill?
		500
		501	sub scale($;$;$) {
		502	my $img = pop;
		503
		504	@_ == 2 ? $img->scale ($_[0] * $img->w * 0.01, $_[1] * $img->h * 0.01)
		505	: @_ ? $img->scale ($_[0] * $img->w * 0.01, $_[0] * $img->h * 0.01)
		506	: $img->scale (TW, TH)
49	}	507	}
50		508
51	sub resize($$$) {	509	sub resize($$$) {
52	my $img = pop;	510	my $img = pop;
53	$img->scale ($_[0], $_[1])	511	$img->scale ($_[0], $_[1])
54	}	512	}
55		513
56	# TODO: ugly	514	=item move $dx, $dy, $img
		515
		516	Moves the image by C<$dx> pixels in the horizontal, and C<$dy> pixels in
		517	the vertical.
		518
		519	Example: move the image right by 20 pixels and down by 30.
		520
		521	move 20, 30, ...
		522
		523	=item rootalign $img
		524
		525	Moves the image so that it appears glued to the screen as opposed to the
		526	window. This gives the illusion of a larger area behind the window. It is
		527	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the
		528	top left of the screen.
		529
		530	Example: load a background image, put it in mirror mode and root align it.
		531
		532	rootalign mirror load "mybg.png"
		533
		534	Example: take the screen background and align it, giving the illusion of
		535	transparency as long as the window isn't in front of other windows.
		536
		537	rootalign root
		538
		539	=cut
		540
57	sub move($$;$) {	541	sub move($$;$) {
		542	my $img = pop->clone;
		543	$img->move ($_[0], $_[1]);
		544	$img
		545	}
		546
		547	sub rootalign($) {
		548	move -TX, -TY, $_[0]
		549	}
		550
		551	=item contrast $factor, $img
		552
		553	=item contrast $r, $g, $b, $img
		554
		555	=item contrast $r, $g, $b, $a, $img
		556
		557	Adjusts the I<contrast> of an image.
		558
		559	#TODO#
		560
		561	=item brightness $factor, $img
		562
		563	=item brightness $r, $g, $b, $img
		564
		565	=item brightness $r, $g, $b, $a, $img
		566
		567	Adjusts the brightness of an image.
		568
		569	=cut
		570
		571	sub contrast($$;$$;$) {
58	my $img = pop;	572	my $img = pop;
59	$img->sub_rect (	573	my ($r, $g, $b, $a) = @_;
60	$_[0], $_[1],
61	$img->w, $img->h,
62	$_[2],
63	)
64	}
65		574
		575	($g, $b) = ($r, $r) if @_ < 4;
		576	$a = 1 if @_ < 5;
		577
		578	$img = $img->clone;
		579	$img->contrast ($r, $g, $b, $a);
		580	$img
		581	}
		582
		583	sub brightness($$;$$;$) {
		584	my $img = pop;
		585	my ($r, $g, $b, $a) = @_;
		586
		587	($g, $b) = ($r, $r) if @_ < 4;
		588	$a = 1 if @_ < 5;
		589
		590	$img = $img->clone;
		591	$img->brightness ($r, $g, $b, $a);
		592	$img
		593	}
		594
		595	=item blur $radius, $img
		596
		597	=item blur $radius_horz, $radius_vert, $img
		598
		599	Gaussian-blurs the image with (roughly) C<$radius> pixel radius. The radii
		600	can also be specified separately.
		601
		602	Blurring is often I<very> slow, at least compared or other
		603	operators. Larger blur radii are slower than smaller ones, too, so if you
		604	don't want to freeze your screen for long times, start experimenting with
		605	low values for radius (<5).
		606
		607	=cut
		608
		609	sub blur($$;$) {
		610	my $img = pop;
		611	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
		612	}
		613
		614	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees
		615
		616	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
		617	pointer at C<$center_x> and C<$center_y> (specified as percentage of image
		618	width/height), generating a new image with width C<$new_width> and height
		619	C<$new_height>.
		620
		621	#TODO# new width, height, maybe more operators?
		622
		623	Example: rotate the image by 90 degrees
		624
		625	=cut
		626
66	sub rotate($$$$$$;$) {	627	sub rotate($$$$$$) {
67	my $img = pop;	628	my $img = pop;
68	$img->rotate (	629	$img->rotate (
69	$_[0],	630	$_[0],
70	$_[1],	631	$_[1],
71	$_[2] * $img->w * .01,	632	$_[2] * $img->w * .01,
72	$_[3] * $img->h * .01,	633	$_[3] * $img->h * .01,
73	$_[4] * (3.14159265 / 180),	634	$_[4] * (3.14159265 / 180),
74	$_[5],
75	)	635	)
76	}	636	}
77		637
78	sub blur($$$) {	638	=back
79	my ($rh, $rv, $img) = @_;
80		639
81	$img->blur ($rh, $rv);	640	=cut
82	}
83		641
84	sub contrast($$;$$;$) {
85	my $img = pop;
86	my ($r, $g, $b, $a) = @_;
87
88	($g, $b) = ($r, $r) if @_ < 4;
89	$a = 1 if @_ < 5;
90
91	$img = $img->clone;
92	$img->contrast ($r, $g, $b, $a);
93	$img
94	}
95
96	sub brightness($$;$$;$) {
97	my $img = pop;
98	my ($r, $g, $b, $a) = @_;
99
100	($g, $b) = ($r, $r) if @_ < 4;
101	$a = 1 if @_ < 5;
102
103	$img = $img->clone;
104	$img->brightness ($r, $g, $b, $a);
105	$img
106	}
107
108	sub X() { $new->{position_sensitive} = 1; $l }
109	sub Y() { $new->{position_sensitive} = 1; $t }
110	sub W() { $new->{size_sensitive} = 1; $w }
111	sub H() { $new->{size_sensitive} = 1; $h }
112
113	sub now() { urxvt::NOW }
114
115	sub again($) {
116	$new->{again} = $_[0];
117	}
118
119	sub counter($) {
120	$new->{again} = $_[0];
121	$bgdsl_self->{counter} + 0
122	}
123	}	642	}
124		643
125	sub parse_expr {	644	sub parse_expr {
126	my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}";	645	my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}";
127	die if $@;	646	die if $@;
136	$self->recalculate;	655	$self->recalculate;
137	}	656	}
138		657
139	# evaluate the current bg expression	658	# evaluate the current bg expression
140	sub recalculate {	659	sub recalculate {
141	my ($self) = @_;	660	my ($arg_self) = @_;
142		661
143	# rate limit evaluation	662	# rate limit evaluation
144		663
145	if ($self->{next_refresh} > urxvt::NOW) {	664	if ($arg_self->{next_refresh} > urxvt::NOW) {
146	$self->{next_refresh_timer} = urxvt::timer->new->after ($self->{next_refresh} - urxvt::NOW)->cb (sub {	665	$arg_self->{next_refresh_timer} = urxvt::timer->new->after ($arg_self->{next_refresh} - urxvt::NOW)->cb (sub {
147	$self->recalculate;	666	$arg_self->recalculate;
148	});	667	});
149	return;	668	return;
150	}	669	}
151		670
152	$self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;	671	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;
153		672
154	# set environment to evaluate user expression	673	# set environment to evaluate user expression
155		674
156	local $bgdsl_self = $self;	675	local $self = $arg_self;
157		676
		677	local $HOME = $ENV{HOME};
158	local $old = $self->{state};	678	local $old = $self->{state};
159	local $new = my $state = $self->{state} = {};	679	local $new = my $state = $self->{state} = {};
160		680
161	($l, $t, $w, $h) =	681	($x, $y, $w, $h) =
162	$self->get_geometry;	682	$self->background_geometry ($self->{border});
163		683
164	# evaluate user expression	684	# evaluate user expression
165		685
166	my $img = eval { $self->{expr}->() };	686	my $img = eval { $self->{expr}->() };
167	warn $@ if $@;#d#	687	warn $@ if $@;#d#
		688	die if !UNIVERSAL::isa $img, "urxvt::img";
		689
		690	$state->{size_sensitive} = 1
		691	if $img->repeat_mode != urxvt::RepeatNormal;
168		692
169	# if the expression is sensitive to external events, prepare reevaluation then	693	# if the expression is sensitive to external events, prepare reevaluation then
170		694
171	my $repeat;	695	my $repeat;
172		696
173	if (my $again = $state->{again}) {	697	if (my $again = $state->{again}) {
174	$repeat = 1;	698	$repeat = 1;
		699	my $self = $self;
175	$state->{timer} = $again == $old->{again}	700	$state->{timer} = $again == $old->{again}
176	? $old->{timer}	701	? $old->{timer}
177	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {	702	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
178	++$self->{counter};	703	++$self->{counter};
179	$self->recalculate	704	$self->recalculate
…		…
208	unless ($repeat) {	733	unless ($repeat) {
209	delete $self->{state};	734	delete $self->{state};
210	delete $self->{expr};	735	delete $self->{expr};
211	}	736	}
212		737
213	# prepare and set background pixmap	738	# set background pixmap
214		739
215	$img = $img->sub_rect (0, 0, $w, $h)
216	if $img->w != $w \|\| $img->h != $h;
217
218	$self->set_background ($img);	740	$self->set_background ($img, $self->{border});
219	$self->scr_recolour (0);	741	$self->scr_recolour (0);
220	$self->want_refresh;	742	$self->want_refresh;
221	}	743	}
222		744
223	sub on_start {	745	sub on_start {
224	my ($self) = @_;	746	my ($self) = @_;
225		747
		748	my $expr = $self->x_resource ("background.expr")
		749	or return;
		750
226	$self->set_expr (parse_expr $EXPR);	751	$self->set_expr (parse_expr $expr);
		752	$self->{border} = $self->x_resource_boolean ("background.border");
227		753
228	()	754	()
229	}	755	}
230		756

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.13 by root, Tue Jun 5 19:32:29 2012 UTC vs. Revision 1.40 by root, Fri Jun 8 22:19:21 2012 UTC

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Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.13 by root, Tue Jun 5 19:32:29 2012 UTC vs.
Revision 1.40 by root, Fri Jun 8 22:19:21 2012 UTC