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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.6 by root, Tue Jun 5 13:56:42 2012 UTC vs.
Revision 1.42 by root, Sun Jun 10 10:42:19 2012 UTC

…		…
1	#! perl	1	#! perl
2		2
3	our $EXPR = 'move load "/root/pix/das_fette_schwein.jpg", repeat_wrap, X, Y';	3	#:META:X_RESOURCE:%.expr:string:background expression
4	$EXPR = 'rotate (move (load "/root/pix/das_fette_schwein.jpg", X, Y), W, H, 50, 50, counter 1/60, repeat_mirror)';	4	#:META:X_RESOURCE:%.border.:boolean:respect the terminal border
5	#$EXPR = 'blur root, 10, 10'
6	#$EXPR = 'blur move (root, -x, -y), 5, 5'
7	#resize load "/root/pix/das_fette_schwein.jpg", w, h
8		5
9	use Safe;	6	#TODO: once, rootalign
10		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 "$HOME/mypic.png"
		96
		97	Just like a mathematical expression with functions, you should read these
		98	expressions from right to left, as the C<load> is evaluated first, and
		99	its result becomes the argument to the C<scale> function.
		100
		101	Many operators also allow some parameters preceding the input image
		102	that modify its behaviour. For example, C<scale> without any additional
		103	arguments scales the image to size of the terminal window. If you specify
		104	an additional argument, it uses it as a percentage:
		105
		106	scale 200, load "$HOME/mypic.png"
		107
		108	This enlarges the image by a factor of 2 (200%). As you can see, C<scale>
		109	has now two arguments, the C<200> and the C<load> expression, while
		110	C<load> only has one argument. Arguments are separated from each other by
		111	commas.
		112
		113	Scale also accepts two arguments, which are then separate factors for both
		114	horizontal and vertical dimensions. For example, this halves the image
		115	width and doubles the image height:
		116
		117	scale 50, 200, load "$HOME/mypic.png"
		118
		119	Other effects than scalign are also readily available, for exmaple, you can
		120	tile the image to fill the whole window, instead of resizing it:
		121
		122	tile load "$HOME/mypic.png"
		123
		124	In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator
		125	is kind of superfluous.
		126
		127	Another common effect is to mirror the image, so that the same edges touch:
		128
		129	mirror load "$HOME/mypic.png"
		130
		131	This is also a typical background expression:
		132
		133	rootalign root
		134
		135	It first takes a snapshot of the screen background image, and then
		136	moves it to the upper left corner of the screen - the result is
		137	pseudo-transparency, as the image seems to be static while the window is
		138	moved around.
		139
		140	=head2 CYCLES AND CACHING
		141
		142	As has been mentioned before, the expression might be evaluated multiple
		143	times. Each time the expression is reevaluated, a new cycle is said to
		144	have begun. Many operators cache their results till the next cycle.
		145
		146	For example, the C<load> operator keeps a copy of the image. If it is
		147	asked to load the same image on the next cycle it will not load it again,
		148	but return the cached copy.
		149
		150	This only works for one cycle though, so as long as you load the same
		151	image every time, it will always be cached, but when you load a different
		152	image, it will forget about the first one.
		153
		154	This allows you to either speed things up by keeping multiple images in
		155	memory, or comserve memory by loading images more often.
		156
		157	For example, you can keep two images in memory and use a random one like
		158	this:
		159
		160	my $img1 = load "img1.png";
		161	my $img2 = load "img2.png";
		162	(0.5 > rand) ? $img1 : $img2
		163
		164	Since both images are "loaded" every time the expression is evaluated,
		165	they are always kept in memory. Contrast this version:
		166
		167	my $path1 = "img1.png";
		168	my $path2 = "img2.png";
		169	load ((0.5 > rand) ? $path1 : $path2)
		170
		171	Here, a path is selected randomly, and load is only called for one image,
		172	so keeps only one image in memory. If, on the next evaluation, luck
		173	decides to use the other path, then it will have to load that image again.
		174
		175	=head1 REFERENCE
		176
		177	=head2 COMMAND LINE SWITCHES
		178
		179	=over 4
		180
		181	=item --background-expr perl-expression
		182
		183	Specifies the Perl expression to evaluate.
		184
		185	=item --background-border
		186
		187	By default, the expression creates an image that fills the full window,
		188	overwriting borders and any other areas, such as the scrollbar.
		189
		190	Specifying this flag changes the behaviour, so that the image only
		191	replaces the background of the character area.
		192
		193	=back
		194
		195	=cut
		196
		197	our $HOME;
11	our ($bgdsl_self, $old, $new);	198	our ($self, $old, $new);
12	our ($l, $t, $w, $h);	199	our ($x, $y, $w, $h);
		200
		201	# enforce at least this interval between updates
		202	our $MIN_INTERVAL = 1/100;
13		203
14	{	204	{
15	package urxvt::bgdsl; # background language	205	package urxvt::bgdsl; # background language
16		206
17	*repeat_black = \&urxvt::RepeatNone; #TODO wtf	207	=head2 PROVIDERS/GENERATORS
18	*repeat_wrap = \&urxvt::RepeatNormal;	208
19	*repeat_pad = \&urxvt::RepeatPad;	209	These functions provide an image, by loading it from disk, grabbing it
20	*repeat_mirror = \&urxvt::RepeatReflect;	210	from the root screen or by simply generating it. They are used as starting
		211	points to get an image you can play with.
		212
		213	=over 4
		214
		215	=item load $path
		216
		217	Loads the image at the given C<$path>. The image is set to plane tiling
		218	mode.
		219
		220	Loaded images will be cached for one cycle.
		221
		222	=cut
21		223
22	sub load($) {	224	sub load($) {
23	my ($path) = @_;	225	my ($path) = @_;
24		226
25	$new->{load}{$path} = $old->{load}{$path} \|\| $bgdsl_self->new_img_from_file ($path);	227	$new->{load}{$path} = $old->{load}{$path} \|\| $self->new_img_from_file ($path);
26	}	228	}
		229
		230	=item root
		231
		232	Returns the root window pixmap, that is, hopefully, the background image
		233	of your screen. The image is set to extend mode.
		234
		235	This function makes your expression root sensitive, that means it will be
		236	reevaluated when the bg image changes.
		237
		238	=cut
27		239
28	sub root() {	240	sub root() {
		241	$new->{rootpmap_sensitive} = 1;
29	die "root op not supported, exg, we need you";	242	die "root op not supported, exg, we need you";
30	}	243	}
31		244
		245	=item solid $colour
		246
		247	=item solid $width, $height, $colour
		248
		249	Creates a new image and completely fills it with the given colour. The
		250	image is set to tiling mode.
		251
		252	If C<$width> and C<$height> are omitted, it creates a 1x1 image, which is
		253	useful for solid backgrounds or for use in filtering effects.
		254
		255	=cut
		256
		257	sub solid($;$$) {
		258	my $colour = pop;
		259
		260	my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] \|\| 1, $_[1] \|\| 1);
		261	$img->fill ($colour);
		262	$img
		263	}
		264
		265	=back
		266
		267	=head2 VARIABLES
		268
		269	The following functions provide variable data such as the terminal window
		270	dimensions. They are not (Perl-) variables, they jsut return stuff that
		271	varies. Most of them make your expression sensitive to some events, for
		272	example using C<TW> (terminal width) means your expression is evaluated
		273	again when the terminal is resized.
		274
		275	=over 4
		276
		277	=item TX
		278
		279	=item TY
		280
		281	Return the X and Y coordinates of the terminal window (the terminal
		282	window is the full window by default, and the character area only when in
		283	border-respect mode).
		284
		285	Using these functions make your expression sensitive to window moves.
		286
		287	These functions are mainly useful to align images to the root window.
		288
		289	Example: load an image and align it so it looks as if anchored to the
		290	background.
		291
		292	move -TX, -TY, load "mybg.png"
		293
		294	=item TW
		295
		296	Return the width (C<TW>) and height (C<TH>) of the terminal window (the
		297	terminal window is the full window by default, and the character area only
		298	when in border-respect mode).
		299
		300	Using these functions make your expression sensitive to window resizes.
		301
		302	These functions are mainly useful to scale images, or to clip images to
		303	the window size to conserve memory.
		304
		305	Example: take the screen background, clip it to the window size, blur it a
		306	bit, align it to the window position and use it as background.
		307
		308	clip move -TX, -TY, blur 5, root
		309
		310	=cut
		311
		312	sub TX() { $new->{position_sensitive} = 1; $x }
		313	sub TY() { $new->{position_sensitive} = 1; $y }
		314	sub TW() { $new->{size_sensitive} = 1; $w }
		315	sub TH() { $new->{size_sensitive} = 1; $h }
		316
		317	=item now
		318
		319	Returns the current time as (fractional) seconds since the epoch.
		320
		321	Using this expression does I<not> make your expression sensitive to time,
		322	but the next two functions do.
		323
		324	=item again $seconds
		325
		326	When this function is used the expression will be reevaluated again in
		327	C<$seconds> seconds.
		328
		329	Example: load some image and rotate it according to the time of day (as if it were
		330	the hour pointer of a clock). Update this image every minute.
		331
		332	again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"
		333
		334	=item counter $seconds
		335
		336	Like C<again>, but also returns an increasing counter value, starting at
		337	0, which might be useful for some simple animation effects.
		338
		339	=cut
		340
		341	sub now() { urxvt::NOW }
		342
		343	sub again($) {
		344	$new->{again} = $_[0];
		345	}
		346
		347	sub counter($) {
		348	$new->{again} = $_[0];
		349	$self->{counter} + 0
		350	}
		351
		352	=back
		353
		354	=head2 TILING MODES
		355
		356	The following operators modify the tiling mode of an image, that is, the
		357	way that pixels outside the image area are painted when the image is used.
		358
		359	=over 4
		360
		361	=item tile $img
		362
		363	Tiles the whole plane with the image and returns this new image - or in
		364	other words, it returns a copy of the image in plane tiling mode.
		365
		366	Example: load an image and tile it over the background, without
		367	resizing. The C<tile> call is superfluous because C<load> already defaults
		368	to tiling mode.
		369
		370	tile load "mybg.png"
		371
		372	=item mirror $img
		373
		374	Similar to tile, but reflects the image each time it uses a new copy, so
		375	that top edges always touch top edges, right edges always touch right
		376	edges and so on (with normal tiling, left edges always touch right edges
		377	and top always touch bottom edges).
		378
		379	Example: load an image and mirror it over the background, avoiding sharp
		380	edges at the image borders at the expense of mirroring the image itself
		381
		382	mirror load "mybg.png"
		383
		384	=item pad $img
		385
		386	Takes an image and modifies it so that all pixels outside the image area
		387	become transparent. This mode is most useful when you want to place an
		388	image over another image or the background colour while leaving all
		389	background pixels outside the image unchanged.
		390
		391	Example: load an image and display it in the upper left corner. The rest
		392	of the space is left "empty" (transparent or wahtever your compisotr does
		393	in alpha mode, else background colour).
		394
		395	pad load "mybg.png"
		396
		397	=item extend $img
		398
		399	Extends the image over the whole plane, using the closest pixel in the
		400	area outside the image. This mode is mostly useful when you more complex
		401	filtering operations and want the pixels outside the image to have the
		402	same values as the pixels near the edge.
		403
		404	Example: just for curiosity, how does this pixel extension stuff work?
		405
		406	extend move 50, 50, load "mybg.png"
		407
		408	=cut
		409
		410	sub pad($) {
		411	my $img = $_[0]->clone;
		412	$img->repeat_mode (urxvt::RepeatNone);
		413	$img
		414	}
		415
		416	sub tile($) {
		417	my $img = $_[0]->clone;
		418	$img->repeat_mode (urxvt::RepeatNormal);
		419	$img
		420	}
		421
		422	sub mirror($) {
		423	my $img = $_[0]->clone;
		424	$img->repeat_mode (urxvt::RepeatReflect);
		425	$img
		426	}
		427
		428	sub extend($) {
		429	my $img = $_[0]->clone;
		430	$img->repeat_mode (urxvt::RepeatPad);
		431	$img
		432	}
		433
		434	=back
		435
		436	=head2 PIXEL OPERATORS
		437
		438	The following operators modify the image pixels in various ways.
		439
		440	=over 4
		441
		442	=item clone $img
		443
		444	Returns an exact copy of the image.
		445
		446	=cut
		447
32	# sub clone($) {	448	sub clone($) {
33	# $_[0]->clone	449	$_[0]->clone
34	# }	450	}
35		451
36	sub subrect($$$$$;$) {	452	=item clip $img
37	$_[0]->sub_rect ($_[1], $_[2], $_[3], $_[4], $_[5])	453
		454	=item clip $width, $height, $img
		455
		456	=item clip $x, $y, $width, $height, $img
		457
		458	Clips an image to the given rectangle. If the rectangle is outside the
		459	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is
		460	larger than the image, then the tiling mode defines how the extra pixels
		461	will be filled.
		462
		463	If C<$x> an C<$y> are missing, then C<0> is assumed for both.
		464
		465	If C<$width> and C<$height> are missing, then the window size will be
		466	assumed.
		467
		468	Example: load an image, blur it, and clip it to the window size to save
		469	memory.
		470
		471	clip blur 10, load "mybg.png"
		472
		473	=cut
		474
		475	sub clip($;$$;$$) {
		476	my $img = pop;
		477	my $h = pop \|\| TH;
		478	my $w = pop \|\| TW;
		479	$img->sub_rect ($_[0], $_[1], $w, $h)
		480	}
		481
		482	=item scale $img
		483
		484	=item scale $size_percent, $img
		485
		486	=item scale $width_percent, $height_percent, $img
		487
		488	Scales the image by the given percentages in horizontal
		489	(C<$width_percent>) and vertical (C<$height_percent>) direction.
		490
		491	If only one percentage is give, it is used for both directions.
		492
		493	If no percentages are given, scales the image to the window size without
		494	keeping aspect.
		495
		496	=item resize $width, $height, $img
		497
		498	Resizes the image to exactly C<$width> times C<$height> pixels.
		499
		500	=cut
		501
		502	#TODO: maximise, maximise_fill?
		503
		504	sub scale($;$;$) {
		505	my $img = pop;
		506
		507	@_ == 2 ? $img->scale ($_[0] * $img->w * 0.01, $_[1] * $img->h * 0.01)
		508	: @_ ? $img->scale ($_[0] * $img->w * 0.01, $_[0] * $img->h * 0.01)
		509	: $img->scale (TW, TH)
38	}	510	}
39		511
40	sub resize($$$) {	512	sub resize($$$) {
41	$_[0]->scale ($_[1], $_[2])	513	my $img = pop;
		514	$img->scale ($_[0], $_[1])
42	}	515	}
43		516
		517	=item move $dx, $dy, $img
		518
		519	Moves the image by C<$dx> pixels in the horizontal, and C<$dy> pixels in
		520	the vertical.
		521
		522	Example: move the image right by 20 pixels and down by 30.
		523
		524	move 20, 30, ...
		525
		526	=item rootalign $img
		527
		528	Moves the image so that it appears glued to the screen as opposed to the
		529	window. This gives the illusion of a larger area behind the window. It is
		530	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the
		531	top left of the screen.
		532
		533	Example: load a background image, put it in mirror mode and root align it.
		534
		535	rootalign mirror load "mybg.png"
		536
		537	Example: take the screen background and align it, giving the illusion of
		538	transparency as long as the window isn't in front of other windows.
		539
		540	rootalign root
		541
		542	=cut
		543
44	sub move($$$;$) {	544	sub move($$;$) {
45	# TODO: must be simpler
46	$_[0]->transform ($_[0]->w, $_[0]->h,
47	1, 0, $_[1],
48	0, 1, $_[2],
49	0, 0, 1,
50	$_[3],
51	)
52	}
53
54	sub rotate($$$$$$;$) {
55	$_[0]->rotate (
56	$_[1],
57	$_[2],
58	$_[3] * $_[0]->w * .01,
59	$_[4] * $_[0]->h * .01,
60	$_[5] * (3.14159265 / 180),
61	$_[6],
62	)
63	}
64
65	sub blur($$$) {
66	my ($img, $rh, $rv) = @_;
67
68	$img = $img->clone;	545	my $img = pop->clone;
69	$img->blur ($rh, $rv);	546	$img->move ($_[0], $_[1]);
70	$img	547	$img
71	}	548	}
72		549
		550	sub rootalign($) {
		551	move -TX, -TY, $_[0]
		552	}
		553
		554	=item contrast $factor, $img
		555
		556	=item contrast $r, $g, $b, $img
		557
		558	=item contrast $r, $g, $b, $a, $img
		559
		560	Adjusts the I<contrast> of an image.
		561
		562	#TODO#
		563
		564	=item brightness $factor, $img
		565
		566	=item brightness $r, $g, $b, $img
		567
		568	=item brightness $r, $g, $b, $a, $img
		569
		570	Adjusts the brightness of an image.
		571
		572	=cut
		573
73	sub contrast($$;$$;$) {	574	sub contrast($$;$$;$) {
		575	my $img = pop;
74	my ($img, $r, $g, $b, $a) = @_;	576	my ($r, $g, $b, $a) = @_;
75		577
76	($g, $b) = ($r, $r) if @_ < 4;	578	($g, $b) = ($r, $r) if @_ < 4;
77	$a = 1 if @_ < 5;	579	$a = 1 if @_ < 5;
78		580
79	$img = $img->clone;	581	$img = $img->clone;
80	$img->contrast ($r, $g, $b, $a);	582	$img->contrast ($r, $g, $b, $a);
81	$img	583	$img
82	}	584	}
83		585
84	sub brightness($$;$$;$) {	586	sub brightness($$;$$;$) {
		587	my $img = pop;
85	my ($img, $r, $g, $b, $a) = @_;	588	my ($r, $g, $b, $a) = @_;
86		589
87	($g, $b) = ($r, $r) if @_ < 4;	590	($g, $b) = ($r, $r) if @_ < 4;
88	$a = 1 if @_ < 5;	591	$a = 1 if @_ < 5;
89		592
90	$img = $img->clone;	593	$img = $img->clone;
91	$img->brightness ($r, $g, $b, $a);	594	$img->brightness ($r, $g, $b, $a);
92	$img	595	$img
93	}	596	}
94		597
95	sub X() { $new->{position_sensitive} = 1; $l }	598	=item blur $radius, $img
96	sub Y() { $new->{position_sensitive} = 1; $t }
97	sub W() { $new->{size_sensitive} = 1; $w }
98	sub H() { $new->{size_sensitive} = 1; $h }
99		599
100	sub now() { urxvt::NOW }	600	=item blur $radius_horz, $radius_vert, $img
101		601
102	sub again($) {	602	Gaussian-blurs the image with (roughly) C<$radius> pixel radius. The radii
103	$new->{again} = $_[0];	603	can also be specified separately.
104	}
105		604
106	sub counter($) {	605	Blurring is often I<very> slow, at least compared or other
107	$new->{again} = $_[0];	606	operators. Larger blur radii are slower than smaller ones, too, so if you
108	$bgdsl_self->{counter}++ + 0	607	don't want to freeze your screen for long times, start experimenting with
		608	low values for radius (<5).
		609
		610	=cut
		611
		612	sub blur($$;$) {
		613	my $img = pop;
		614	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
109	}	615	}
		616
		617	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees
		618
		619	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
		620	pointer at C<$center_x> and C<$center_y> (specified as percentage of image
		621	width/height), generating a new image with width C<$new_width> and height
		622	C<$new_height>.
		623
		624	#TODO# new width, height, maybe more operators?
		625
		626	Example: rotate the image by 90 degrees
		627
		628	=cut
		629
		630	sub rotate($$$$$$) {
		631	my $img = pop;
		632	$img->rotate (
		633	$_[0],
		634	$_[1],
		635	$_[2] * $img->w * .01,
		636	$_[3] * $img->h * .01,
		637	$_[4] * (3.14159265 / 180),
		638	)
		639	}
		640
		641	=back
		642
		643	=cut
		644
110	}	645	}
111		646
112	sub parse_expr {	647	sub parse_expr {
113	my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}";	648	my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}";
114	die if $@;	649	die if $@;
123	$self->recalculate;	658	$self->recalculate;
124	}	659	}
125		660
126	# evaluate the current bg expression	661	# evaluate the current bg expression
127	sub recalculate {	662	sub recalculate {
128	my ($self) = @_;	663	my ($arg_self) = @_;
129		664
130	#TODO: rate limit calls	665	# rate limit evaluation
131		666
132	local $bgdsl_self = $self;	667	if ($arg_self->{next_refresh} > urxvt::NOW) {
		668	$arg_self->{next_refresh_timer} = urxvt::timer->new->after ($arg_self->{next_refresh} - urxvt::NOW)->cb (sub {
		669	$arg_self->recalculate;
		670	});
		671	return;
		672	}
133		673
		674	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;
		675
		676	# set environment to evaluate user expression
		677
		678	local $self = $arg_self;
		679
		680	local $HOME = $ENV{HOME};
134	local $old = $self->{state};	681	local $old = $self->{state};
135	local $new = my $state = $self->{state} = {};	682	local $new = my $state = $self->{state} = {};
136		683
137	($l, $t, $w, $h) =	684	($x, $y, $w, $h) =
138	$self->get_geometry;	685	$self->background_geometry ($self->{border});
		686
		687	# evaluate user expression
139		688
140	my $img = eval { $self->{expr}->() };	689	my $img = eval { $self->{expr}->() };
141	warn $@ if $@;#d#	690	warn $@ if $@;#d#
		691	die if !UNIVERSAL::isa $img, "urxvt::img";
		692
		693	$state->{size_sensitive} = 1
		694	if $img->repeat_mode != urxvt::RepeatNormal;
		695
		696	# if the expression is sensitive to external events, prepare reevaluation then
142		697
143	my $repeat;	698	my $repeat;
144		699
145	if (my $again = $state->{again}) {	700	if (my $again = $state->{again}) {
146	$repeat = 1;	701	$repeat = 1;
		702	my $self = $self;
147	$state->{timer} = $again == $old->{again}	703	$state->{timer} = $again == $old->{again}
148	? $old->{timer}	704	? $old->{timer}
149	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub { $self->recalculate });	705	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
		706	++$self->{counter};
		707	$self->recalculate
		708	});
150	}	709	}
151		710
152	if (delete $state->{position_sensitive}) {	711	if (delete $state->{position_sensitive}) {
153	$repeat = 1;	712	$repeat = 1;
154	$self->enable (position_change => sub { $_[0]->recalculate });	713	$self->enable (position_change => sub { $_[0]->recalculate });
…		…
161	$self->enable (size_change => sub { $_[0]->recalculate });	720	$self->enable (size_change => sub { $_[0]->recalculate });
162	} else {	721	} else {
163	$self->disable ("size_change");	722	$self->disable ("size_change");
164	}	723	}
165		724
		725	if (delete $state->{rootpmap_sensitive}) {
		726	$repeat = 1;
		727	$self->enable (rootpmap_change => sub { $_[0]->recalculate });
		728	} else {
		729	$self->disable ("rootpmap_change");
		730	}
		731
		732	# clear stuff we no longer need
		733
166	%$old = ();	734	%$old = ();
167		735
168	unless ($repeat) {	736	unless ($repeat) {
169	delete $self->{state};	737	delete $self->{state};
170	delete $self->{expr};	738	delete $self->{expr};
171	}	739	}
172		740
173	$img = $img->sub_rect (0, 0, $w, $h)	741	# set background pixmap
174	if $img->w != $w \|\| $img->h != $h;
175		742
176	$self->set_background ($img);	743	$self->set_background ($img, $self->{border});
177	$self->scr_recolour (0);	744	$self->scr_recolour (0);
178	$self->want_refresh;	745	$self->want_refresh;
179	}	746	}
180		747
181	sub on_start {	748	sub on_start {
182	my ($self) = @_;	749	my ($self) = @_;
183		750
		751	my $expr = $self->x_resource ("background.expr")
		752	or return;
		753
184	$self->set_expr (parse_expr $EXPR);	754	$self->set_expr (parse_expr $expr);
		755	$self->{border} = $self->x_resource_boolean ("background.border");
185		756
186	()	757	()
187	}	758	}
188		759

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.6 by root, Tue Jun 5 13:56:42 2012 UTC vs. Revision 1.42 by root, Sun Jun 10 10:42:19 2012 UTC

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Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.6 by root, Tue Jun 5 13:56:42 2012 UTC vs.
Revision 1.42 by root, Sun Jun 10 10:42:19 2012 UTC