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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.3 by root, Tue Jun 5 12:08:23 2012 UTC vs.
Revision 1.44 by root, Sun Jun 10 11:31:22 2012 UTC

…		…
1	#! perl	1	#! perl
2		2
3	our $EXPR = 'move load "/root/pix/das_fette_schwein.jpg", left, top';	3	#:META:X_RESOURCE:%.expr:string:background expression
4	#$EXPR = 'blur root, 10, 10'	4	#:META:X_RESOURCE:%.border.:boolean:respect the terminal border
5	#$EXPR = 'blur move (root, -x, -y), 5, 5'
6	#resize load "/root/pix/das_fette_schwein.jpg", w, h
7		5
8	use Safe;	6	#TODO: once, rootalign
9		7
		8	=head1 NAME
		9
		10	background - manage terminal background
		11
		12	=head1 SYNOPSIS
		13
		14	urxvt --background-expr 'background expression'
		15	--background-border
		16
		17	=head1 DESCRIPTION
		18
		19	This extension manages the terminal background by creating a picture that
		20	is behind the text, replacing the normal background colour.
		21
		22	It does so by evaluating a Perl expression that I<calculates> the image on
		23	the fly, for example, by grabbing the root background or loading a file.
		24
		25	While the full power of Perl is available, the operators have been design
		26	to be as simple as possible.
		27
		28	For example, to load an image and scale it to the window size, you would
		29	use:
		30
		31	urxvt --background-expr 'scale load "/path/to/mybg.png"'
		32
		33	Or specified as a X resource:
		34
		35	URxvt.background-expr: scale load "/path/to/mybg.png"
		36
		37	=head1 THEORY OF OPERATION
		38
		39	At startup, just before the window is mapped for the first time, the
		40	expression is evaluated and must yield an image. The image is then
		41	extended as necessary to cover the whole terminal window, and is set as a
		42	background pixmap.
		43
		44	If the image contains an alpha channel, then it will be used as-is in
		45	visuals that support alpha channels (for example, for a compositing
		46	manager). In other visuals, the terminal background colour will be used to
		47	replace any transparency.
		48
		49	When the expression relies, directly or indirectly, on the window size,
		50	position, the root pixmap, or a timer, then it will be remembered. If not,
		51	then it will be removed.
		52
		53	If any of the parameters that the expression relies on changes (when the
		54	window is moved or resized, its position or size changes; when the root
		55	pixmap is replaced by another one the root background changes; or when the
		56	timer elapses), then the expression will be evaluated again.
		57
		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
		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
		62	after it's size changes.
		63
		64	=head2 EXPRESSIONS
		65
		66	Expressions are normal Perl expressions, in fact, they are Perl blocks -
		67	which means you could use multiple lines and statements:
		68
		69	again 3600;
		70	if (localtime now)[6]) {
		71	return scale load "$HOME/weekday.png";
		72	} else {
		73	return scale load "$HOME/sunday.png";
		74	}
		75
		76	This expression gets evaluated once per hour. It will set F<sunday.png> as
		77	background on Sundays, and F<weekday.png> on all other days.
		78
		79	Fortunately, we expect that most expressions will be much simpler, with
		80	little Perl knowledge needed.
		81
		82	Basically, you always start with a function that "generates" an image
		83	object, such as C<load>, which loads an image from disk, or C<root>, which
		84	returns the root window background image:
		85
		86	load "$HOME/mypic.png"
		87
		88	The path is usually specified as a quoted string (the exact rules can be
		89	found in the L<perlop> manpage). The F<$HOME> at the beginning of the
		90	string is expanded to the home directory.
		91
		92	Then you prepend one or more modifiers or filtering expressions, such as
		93	C<scale>:
		94
		95	scale load "$HOME/mypic.png"
		96
		97	Just like a mathematical expression with functions, you should read these
		98	expressions from right to left, as the C<load> is evaluated first, and
		99	its result becomes the argument to the C<scale> function.
		100
		101	Many operators also allow some parameters preceding the input image
		102	that modify its behaviour. For example, C<scale> without any additional
		103	arguments scales the image to size of the terminal window. If you specify
		104	an additional argument, it uses it as a scale factor (multiply by 100 to
		105	get a percentage):
		106
		107	scale 2, load "$HOME/mypic.png"
		108
		109	This enlarges the image by a factor of 2 (200%). As you can see, C<scale>
		110	has now two arguments, the C<200> and the C<load> expression, while
		111	C<load> only has one argument. Arguments are separated from each other by
		112	commas.
		113
		114	Scale also accepts two arguments, which are then separate factors for both
		115	horizontal and vertical dimensions. For example, this halves the image
		116	width and doubles the image height:
		117
		118	scale 0.5, 2, load "$HOME/mypic.png"
		119
		120	Other effects than scalign are also readily available, for exmaple, you can
		121	tile the image to fill the whole window, instead of resizing it:
		122
		123	tile load "$HOME/mypic.png"
		124
		125	In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator
		126	is kind of superfluous.
		127
		128	Another common effect is to mirror the image, so that the same edges touch:
		129
		130	mirror load "$HOME/mypic.png"
		131
		132	This is also a typical background expression:
		133
		134	rootalign root
		135
		136	It first takes a snapshot of the screen background image, and then
		137	moves it to the upper left corner of the screen - the result is
		138	pseudo-transparency, as the image seems to be static while the window is
		139	moved around.
		140
		141	=head2 CYCLES AND CACHING
		142
		143	As has been mentioned before, the expression might be evaluated multiple
		144	times. Each time the expression is reevaluated, a new cycle is said to
		145	have begun. Many operators cache their results till the next cycle.
		146
		147	For example, the C<load> operator keeps a copy of the image. If it is
		148	asked to load the same image on the next cycle it will not load it again,
		149	but return the cached copy.
		150
		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
		153	image, it will forget about the first one.
		154
		155	This allows you to either speed things up by keeping multiple images in
		156	memory, or comserve memory by loading images more often.
		157
		158	For example, you can keep two images in memory and use a random one like
		159	this:
		160
		161	my $img1 = load "img1.png";
		162	my $img2 = load "img2.png";
		163	(0.5 > rand) ? $img1 : $img2
		164
		165	Since both images are "loaded" every time the expression is evaluated,
		166	they are always kept in memory. Contrast this version:
		167
		168	my $path1 = "img1.png";
		169	my $path2 = "img2.png";
		170	load ((0.5 > rand) ? $path1 : $path2)
		171
		172	Here, a path is selected randomly, and load is only called for one image,
		173	so keeps only one image in memory. If, on the next evaluation, luck
		174	decides to use the other path, then it will have to load that image again.
		175
		176	=head1 REFERENCE
		177
		178	=head2 COMMAND LINE SWITCHES
		179
		180	=over 4
		181
		182	=item --background-expr perl-expression
		183
		184	Specifies the Perl expression to evaluate.
		185
		186	=item --background-border
		187
		188	By default, the expression creates an image that fills the full window,
		189	overwriting borders and any other areas, such as the scrollbar.
		190
		191	Specifying this flag changes the behaviour, so that the image only
		192	replaces the background of the character area.
		193
		194	=back
		195
		196	=cut
		197
		198	our $HOME;
10	our ($bgdsl_self, $old, $new);	199	our ($self, $old, $new);
11	our ($l, $t, $w, $h);	200	our ($x, $y, $w, $h);
		201
		202	# enforce at least this interval between updates
		203	our $MIN_INTERVAL = 1/100;
12		204
13	{	205	{
14	package urxvt::bgdsl; # background language	206	package urxvt::bgdsl; # background language
15		207
16	*repeat_black = \&urxvt::RepeatNone; #TODO wtf	208	use List::Util qw(min max sum shuffle);
17	*repeat_wrap = \&urxvt::RepeatNormal;	209
18	*repeat_pad = \&urxvt::RepeatPad;	210	=head2 PROVIDERS/GENERATORS
19	*repeat_mirror = \&urxvt::RepeatReflect;	211
		212	These functions provide an image, by loading it from disk, grabbing it
		213	from the root screen or by simply generating it. They are used as starting
		214	points to get an image you can play with.
		215
		216	=over 4
		217
		218	=item load $path
		219
		220	Loads the image at the given C<$path>. The image is set to plane tiling
		221	mode.
		222
		223	Loaded images will be cached for one cycle.
		224
		225	=cut
20		226
21	sub load($) {	227	sub load($) {
22	my ($path) = @_;	228	my ($path) = @_;
23		229
24	$new->{load}{$path} = $old->{load}{$path} \|\| $bgdsl_self->new_img_from_file ($path);	230	$new->{load}{$path} = $old->{load}{$path} \|\| $self->new_img_from_file ($path);
25	}	231	}
		232
		233	=item root
		234
		235	Returns the root window pixmap, that is, hopefully, the background image
		236	of your screen. The image is set to extend mode.
		237
		238	This function makes your expression root sensitive, that means it will be
		239	reevaluated when the bg image changes.
		240
		241	=cut
26		242
27	sub root() {	243	sub root() {
		244	$new->{rootpmap_sensitive} = 1;
28	die "root op not supported, exg, we need you";	245	die "root op not supported, exg, we need you";
29	}	246	}
30		247
		248	=item solid $colour
		249
		250	=item solid $width, $height, $colour
		251
		252	Creates a new image and completely fills it with the given colour. The
		253	image is set to tiling mode.
		254
		255	If C<$width> and C<$height> are omitted, it creates a 1x1 image, which is
		256	useful for solid backgrounds or for use in filtering effects.
		257
		258	=cut
		259
		260	sub solid($;$$) {
		261	my $colour = pop;
		262
		263	my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] \|\| 1, $_[1] \|\| 1);
		264	$img->fill ($colour);
		265	$img
		266	}
		267
		268	=back
		269
		270	=head2 VARIABLES
		271
		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
		314
		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($) {
		351	$new->{again} = $_[0];
		352	$self->{counter} + 0
		353	}
		354
		355	=back
		356
		357	=head2 TILING MODES
		358
		359	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.
		361
		362	=over 4
		363
		364	=item tile $img
		365
		366	Tiles the whole plane with the image and returns this new image - or in
		367	other words, it returns a copy of the image in plane tiling mode.
		368
		369	Example: load an image and tile it over the background, without
		370	resizing. The C<tile> call is superfluous because C<load> already defaults
		371	to tiling mode.
		372
		373	tile load "mybg.png"
		374
		375	=item mirror $img
		376
		377	Similar to tile, but reflects the image each time it uses a new copy, so
		378	that top edges always touch top edges, right edges always touch right
		379	edges and so on (with normal tiling, left edges always touch right edges
		380	and top always touch bottom edges).
		381
		382	Example: load an image and mirror it over the background, avoiding sharp
		383	edges at the image borders at the expense of mirroring the image itself
		384
		385	mirror load "mybg.png"
		386
		387	=item pad $img
		388
		389	Takes an image and modifies it so that all pixels outside the image area
		390	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
		392	background pixels outside the image unchanged.
		393
		394	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
		396	in alpha mode, else background colour).
		397
		398	pad load "mybg.png"
		399
		400	=item extend $img
		401
		402	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
		404	filtering operations and want the pixels outside the image to have the
		405	same values as the pixels near the edge.
		406
		407	Example: just for curiosity, how does this pixel extension stuff work?
		408
		409	extend move 50, 50, load "mybg.png"
		410
		411	=cut
		412
		413	sub pad($) {
		414	my $img = $_[0]->clone;
		415	$img->repeat_mode (urxvt::RepeatNone);
		416	$img
		417	}
		418
		419	sub tile($) {
		420	my $img = $_[0]->clone;
		421	$img->repeat_mode (urxvt::RepeatNormal);
		422	$img
		423	}
		424
		425	sub mirror($) {
		426	my $img = $_[0]->clone;
		427	$img->repeat_mode (urxvt::RepeatReflect);
		428	$img
		429	}
		430
		431	sub extend($) {
		432	my $img = $_[0]->clone;
		433	$img->repeat_mode (urxvt::RepeatPad);
		434	$img
		435	}
		436
		437	=back
		438
		439	=head2 PIXEL OPERATORS
		440
		441	The following operators modify the image pixels in various ways.
		442
		443	=over 4
		444
		445	=item clone $img
		446
		447	Returns an exact copy of the image.
		448
		449	=cut
		450
		451	sub clone($) {
		452	$_[0]->clone
		453	}
		454
		455	=item clip $img
		456
		457	=item clip $width, $height, $img
		458
		459	=item clip $x, $y, $width, $height, $img
		460
		461	Clips an image to the given rectangle. If the rectangle is outside the
		462	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is
		463	larger than the image, then the tiling mode defines how the extra pixels
		464	will be filled.
		465
		466	If C<$x> an C<$y> are missing, then C<0> is assumed for both.
		467
		468	If C<$width> and C<$height> are missing, then the window size will be
		469	assumed.
		470
		471	Example: load an image, blur it, and clip it to the window size to save
		472	memory.
		473
		474	clip blur 10, load "mybg.png"
		475
		476	=cut
		477
		478	sub clip($;$$;$$) {
		479	my $img = pop;
		480	my $h = pop \|\| TH;
		481	my $w = pop \|\| TW;
		482	$img->sub_rect ($_[0], $_[1], $w, $h)
		483	}
		484
		485	=item scale $img
		486
		487	=item scale $size_factor, $img
		488
		489	=item scale $width_factor, $height_factor, $img
		490
		491	Scales the image by the given factors in horizontal
		492	(C<$width>) and vertical (C<$height>) direction.
		493
		494	If only one factor is give, it is used for both directions.
		495
		496	If no factors are given, scales the image to the window size without
		497	keeping aspect.
		498
		499	=item resize $width, $height, $img
		500
		501	Resizes the image to exactly C<$width> times C<$height> pixels.
		502
		503	=item fit $img
		504
		505	=item fit $width, $height, $img
		506
		507	Fits the image into the given C<$width> and C<$height> without changing
		508	aspect, or the terminal size. That means it will be shrunk or grown until
		509	the whole image fits into the given area, possibly leaving borders.
		510
		511	=item cover $img
		512
		513	=item cover $width, $height, $img
		514
		515	Similar to C<fit>, but shrinks or grows until all of the area is covered
		516	by the image, so instead of potentially leaving borders, it will cut off
		517	image data that doesn't fit.
		518
		519	=cut
		520
		521	sub scale($;$;$) {
		522	my $img = pop;
		523
		524	@_ == 2 ? $img->scale ($_[0] * $img->w, $_[1] * $img->h)
		525	: @_ ? $img->scale ($_[0] * $img->w, $_[0] * $img->h)
		526	: $img->scale (TW, TH)
		527	}
		528
31	sub resize($$$) {	529	sub resize($$$) {
32	$_[0]->scale ($_[1], $_[2])	530	my $img = pop;
		531	$img->scale ($_[0], $_[1])
33	}	532	}
34		533
		534	sub fit($;$$) {
		535	my $img = pop;
		536	my $w = ($_[0] \|\| TW) / $img->w;
		537	my $h = ($_[1] \|\| TH) / $img->h;
		538	scale +(min $w, $h), $img
		539	}
		540
		541	sub cover($;$$) {
		542	my $img = pop;
		543	my $w = ($_[0] \|\| TW) / $img->w;
		544	my $h = ($_[1] \|\| TH) / $img->h;
		545	scale +(max $w, $h), $img
		546	}
		547
		548	=item move $dx, $dy, $img
		549
		550	Moves the image by C<$dx> pixels in the horizontal, and C<$dy> pixels in
		551	the vertical.
		552
		553	Example: move the image right by 20 pixels and down by 30.
		554
		555	move 20, 30, ...
		556
		557	=item center $img
		558
		559	=item center $width, $height, $img
		560
		561	Centers the image, i.e. the center of the image is moved to the center of
		562	the terminal window (or the box specified by C<$width> and C<$height> if
		563	given).
		564
		565	=item rootalign $img
		566
		567	Moves the image so that it appears glued to the screen as opposed to the
		568	window. This gives the illusion of a larger area behind the window. It is
		569	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the
		570	top left of the screen.
		571
		572	Example: load a background image, put it in mirror mode and root align it.
		573
		574	rootalign mirror load "mybg.png"
		575
		576	Example: take the screen background and align it, giving the illusion of
		577	transparency as long as the window isn't in front of other windows.
		578
		579	rootalign root
		580
		581	=cut
		582
35	sub move($$$) {	583	sub move($$;$) {
36	# TODO: must be simpler
37	$_[0]->transform ($_[0]->w, $_[0]->h, $_[1],
38	1, 0, -$_[2],
39	0, 1, -$_[3],
40	0, 0, 1,
41	)
42	}
43
44	sub rotate($$$$) {
45	$_[0]->rotate ($_[0], $_[1], $_[2], $_[3] * (3.14159265 / 180))
46	}
47
48	sub blur($$$) {
49	my ($img, $rh, $rv) = @_;
50
51	$img = $img->clone;	584	my $img = pop->clone;
52	$img->clone->blur ($rh, $rv);	585	$img->move ($_[0], $_[1]);
53	$img	586	$img
54	}	587	}
55		588
		589	sub center($;$$) {
		590	my $img = pop;
		591	my $w = $_[0] \|\| TW;
		592	my $h = $_[0] \|\| TH;
		593
		594	move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img
		595	}
		596
		597	sub rootalign($) {
		598	move -TX, -TY, $_[0]
		599	}
		600
		601	=item contrast $factor, $img
		602
		603	=item contrast $r, $g, $b, $img
		604
		605	=item contrast $r, $g, $b, $a, $img
		606
		607	Adjusts the I<contrast> of an image.
		608
		609	#TODO#
		610
		611	=item brightness $factor, $img
		612
		613	=item brightness $r, $g, $b, $img
		614
		615	=item brightness $r, $g, $b, $a, $img
		616
		617	Adjusts the brightness of an image.
		618
		619	=cut
		620
56	sub contrast($$;$$;$) {	621	sub contrast($$;$$;$) {
		622	my $img = pop;
57	my ($img, $r, $g, $b, $a) = @_;	623	my ($r, $g, $b, $a) = @_;
		624
58	($g, $b) = ($r, $r) if @_ < 4;	625	($g, $b) = ($r, $r) if @_ < 4;
59	$a = 1 if @_ < 5;	626	$a = 1 if @_ < 5;
		627
60	$img = $img->clone;	628	$img = $img->clone;
61	$img->contrast ($r, $g, $b, $a);	629	$img->contrast ($r, $g, $b, $a);
62	$img	630	$img
63	}	631	}
64		632
65	sub brightness($$;$$;$) {	633	sub brightness($$;$$;$) {
		634	my $img = pop;
66	my ($img, $r, $g, $b, $a) = @_;	635	my ($r, $g, $b, $a) = @_;
		636
67	($g, $b) = ($r, $r) if @_ < 4;	637	($g, $b) = ($r, $r) if @_ < 4;
68	$a = 1 if @_ < 5;	638	$a = 1 if @_ < 5;
		639
69	$img = $img->clone;	640	$img = $img->clone;
70	$img->brightness ($r, $g, $b, $a);	641	$img->brightness ($r, $g, $b, $a);
71	$img	642	$img
72	}	643	}
73		644
74	sub left () { $new->{position_sensitive} = 1; $l }	645	=item blur $radius, $img
75	sub top () { $new->{position_sensitive} = 1; $t }
76	sub width () { $new->{size_sensitive} = 1; $w }
77	sub height() { $new->{size_sensitive} = 1; $h }
78		646
79	sub now() { urxvt::NOW }	647	=item blur $radius_horz, $radius_vert, $img
80		648
81	sub again($) {	649	Gaussian-blurs the image with (roughly) C<$radius> pixel radius. The radii
82	$new->{again} = $_[0];	650	can also be specified separately.
83	}
84		651
85	sub counter($) {	652	Blurring is often I<very> slow, at least compared or other
86	$new->{again} = $_[0];	653	operators. Larger blur radii are slower than smaller ones, too, so if you
87	$bgdsl_self->{counter}++ + 0	654	don't want to freeze your screen for long times, start experimenting with
		655	low values for radius (<5).
		656
		657	=cut
		658
		659	sub blur($$;$) {
		660	my $img = pop;
		661	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
88	}	662	}
		663
		664	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees
		665
		666	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
		667	pointer at C<$center_x> and C<$center_y> (specified as factor of image
		668	width/height), generating a new image with width C<$new_width> and height
		669	C<$new_height>.
		670
		671	#TODO# new width, height, maybe more operators?
		672
		673	Example: rotate the image by 90 degrees
		674
		675	=cut
		676
		677	sub rotate($$$$$$) {
		678	my $img = pop;
		679	$img->rotate (
		680	$_[0],
		681	$_[1],
		682	$_[2] * $img->w,
		683	$_[3] * $img->h,
		684	$_[4] * (3.14159265 / 180),
		685	)
		686	}
		687
		688	=back
		689
		690	=cut
		691
89	}	692	}
90		693
91	sub parse_expr {	694	sub parse_expr {
92	my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}";	695	my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}";
93	die if $@;	696	die if $@;
96		699
97	# compiles a parsed expression	700	# compiles a parsed expression
98	sub set_expr {	701	sub set_expr {
99	my ($self, $expr) = @_;	702	my ($self, $expr) = @_;
100		703
101	local $Data::Dumper::Deparse=1; use Data::Dumper; warn Dumper $expr;#d#
102	$self->{expr} = $expr;	704	$self->{expr} = $expr;
103	$self->recalculate;	705	$self->recalculate;
104	}	706	}
105		707
106	# evaluate the current bg expression	708	# evaluate the current bg expression
107	sub recalculate {	709	sub recalculate {
108	my ($self) = @_;	710	my ($arg_self) = @_;
109		711
110	local $bgdsl_self = $self;	712	# rate limit evaluation
111		713
		714	if ($arg_self->{next_refresh} > urxvt::NOW) {
		715	$arg_self->{next_refresh_timer} = urxvt::timer->new->after ($arg_self->{next_refresh} - urxvt::NOW)->cb (sub {
		716	$arg_self->recalculate;
		717	});
		718	return;
		719	}
		720
		721	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;
		722
		723	# set environment to evaluate user expression
		724
		725	local $self = $arg_self;
		726
		727	local $HOME = $ENV{HOME};
112	local $old = $self->{state};	728	local $old = $self->{state};
113	local $new = my $state = $self->{state} = {};	729	local $new = my $state = $self->{state} = {};
114		730
115	($l, $t, $w, $h) =	731	($x, $y, $w, $h) =
116	$self->get_geometry;	732	$self->background_geometry ($self->{border});
117		733
118	warn "$l, $t";#d#	734	# evaluate user expression
119		735
120	my $img = eval { $self->{expr}->() };	736	my $img = eval { $self->{expr}->() };
121	warn $@ if $@;#d#	737	warn $@ if $@;#d#
		738	die if !UNIVERSAL::isa $img, "urxvt::img";
		739
		740	$state->{size_sensitive} = 1
		741	if $img->repeat_mode != urxvt::RepeatNormal;
		742
		743	# if the expression is sensitive to external events, prepare reevaluation then
122		744
123	my $repeat;	745	my $repeat;
124		746
125	if (my $again = $state->{again}) {	747	if (my $again = $state->{again}) {
126	$repeat = 1;	748	$repeat = 1;
127	$state->{again} = urxvt::timer->new->after ($again)->cb (sub { $self->recalculate });	749	my $self = $self;
		750	$state->{timer} = $again == $old->{again}
		751	? $old->{timer}
		752	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
		753	++$self->{counter};
		754	$self->recalculate
		755	});
128	}	756	}
129		757
130	if (delete $state->{position_sensitive}) {	758	if (delete $state->{position_sensitive}) {
131	$repeat = 1;	759	$repeat = 1;
132	$self->enable (position_change => sub { $_[0]->recalculate });	760	$self->enable (position_change => sub { $_[0]->recalculate });
…		…
139	$self->enable (size_change => sub { $_[0]->recalculate });	767	$self->enable (size_change => sub { $_[0]->recalculate });
140	} else {	768	} else {
141	$self->disable ("size_change");	769	$self->disable ("size_change");
142	}	770	}
143		771
144	# TODO: install handlers for geometry changes &c	772	if (delete $state->{rootpmap_sensitive}) {
		773	$repeat = 1;
		774	$self->enable (rootpmap_change => sub { $_[0]->recalculate });
		775	} else {
		776	$self->disable ("rootpmap_change");
		777	}
145		778
146	warn $img;	779	# clear stuff we no longer need
		780
		781	%$old = ();
		782
		783	unless ($repeat) {
		784	delete $self->{state};
		785	delete $self->{expr};
		786	}
		787
		788	# set background pixmap
		789
147	$self->set_background ($img);	790	$self->set_background ($img, $self->{border});
148	$self->scr_recolour (0);	791	$self->scr_recolour (0);
149	$self->want_refresh;	792	$self->want_refresh;
150	}	793	}
151		794
152	sub on_start {	795	sub on_start {
153	my ($self) = @_;	796	my ($self) = @_;
154		797
		798	my $expr = $self->x_resource ("background.expr")
		799	or return;
		800
155	$self->set_expr (parse_expr $EXPR);	801	$self->set_expr (parse_expr $expr);
		802	$self->{border} = $self->x_resource_boolean ("background.border");
156		803
157	()	804	()
158	}	805	}
159		806

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.3 by root, Tue Jun 5 12:08:23 2012 UTC vs. Revision 1.44 by root, Sun Jun 10 11:31:22 2012 UTC

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Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.3 by root, Tue Jun 5 12:08:23 2012 UTC vs.
Revision 1.44 by root, Sun Jun 10 11:31:22 2012 UTC