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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.38 by root, Fri Jun 8 21:48:07 2012 UTC vs.
Revision 1.79 by root, Tue Sep 4 22:41:11 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		6
6	#TODO: once, rootalign	7	=head1 NAME
7		8
8	=head1 background - manage terminal background	9	background - manage terminal background
9		10
10	=head2 SYNOPSIS	11	=head1 SYNOPSIS
11		12
12	urxvt --background-expr 'background expression'	13	urxvt --background-expr 'background expression'
13	--background-border	14	--background-border
		15	--background-interval seconds
14		16
		17	=head1 QUICK AND DIRTY CHEAT SHEET
		18
		19	Just load a random jpeg image and tile the background with it without
		20	scaling or anything else:
		21
		22	load "/path/to/img.jpg"
		23
		24	The same, but use mirroring/reflection instead of tiling:
		25
		26	mirror load "/path/to/img.jpg"
		27
		28	Load an image and scale it to exactly fill the terminal window:
		29
		30	scale keep { load "/path/to/img.jpg" }
		31
		32	Implement pseudo-transparency by using a suitably-aligned root pixmap
		33	as window background:
		34
		35	rootalign root
		36
		37	Likewise, but keep a blurred copy:
		38
		39	rootalign keep { blur 10, root }
		40
15	=head2 DESCRIPTION	41	=head1 DESCRIPTION
16		42
17	This extension manages the terminal background by creating a picture that	43	This extension manages the terminal background by creating a picture that
18	is behind the text, replacing the normal background colour.	44	is behind the text, replacing the normal background colour.
19		45
20	It does so by evaluating a Perl expression that I<calculates> the image on	46	It does so by evaluating a Perl expression that I<calculates> the image on
24	to be as simple as possible.	50	to be as simple as possible.
25		51
26	For example, to load an image and scale it to the window size, you would	52	For example, to load an image and scale it to the window size, you would
27	use:	53	use:
28		54
29	urxvt --background-expr 'scale load "/path/to/mybg.png"'	55	urxvt --background-expr 'scale keep { load "/path/to/mybg.png" }'
30		56
31	Or specified as a X resource:	57	Or specified as a X resource:
32		58
33	URxvt.background-expr: scale load "/path/to/mybg.png"	59	URxvt.background-expr: scale keep { load "/path/to/mybg.png" }
34		60
35	=head2 THEORY OF OPERATION	61	=head1 THEORY OF OPERATION
36		62
37	At startup, just before the window is mapped for the first time, the	63	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	64	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	65	extended as necessary to cover the whole terminal window, and is set as a
40	background pixmap.	66	background pixmap.
…		…
51	If any of the parameters that the expression relies on changes (when the	77	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	78	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	79	pixmap is replaced by another one the root background changes; or when the
54	timer elapses), then the expression will be evaluated again.	80	timer elapses), then the expression will be evaluated again.
55		81
56	For example, an expression such as C<scale load "$HOME/mybg.png"> scales the	82	For example, an expression such as C<scale keep { load "$HOME/mybg.png"
57	image to the window size, so it relies on the window size and will	83	}> scales the image to the window size, so it relies on the window size
58	be reevaluated each time it is changed, but not when it moves for	84	and will 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	85	example. That ensures that the picture always fills the terminal, even
60	after it's size changes.	86	after its size changes.
61		87
62	=head3 EXPRESSIONS	88	=head2 EXPRESSIONS
63		89
64	Expressions are normal Perl expressions, in fact, they are Perl blocks -	90	Expressions are normal Perl expressions, in fact, they are Perl blocks -
65	which means you could use multiple lines and statements:	91	which means you could use multiple lines and statements:
66		92
		93	scale keep {
67	again 3600;	94	again 3600;
68	if (localtime now)[6]) {	95	if (localtime now)[6]) {
69	return scale load "$HOME/weekday.png";	96	return load "$HOME/weekday.png";
70	} else {	97	} else {
71	return scale load "$HOME/sunday.png";	98	return load "$HOME/sunday.png";
		99	}
72	}	100	}
73		101
74	This expression gets evaluated once per hour. It will set F<sunday.png> as	102	This inner expression is evaluated once per hour (and whenever the
		103	terminal window is resized). It sets F<sunday.png> as background on
75	background on sundays, and F<weekday.png> on all other days.	104	Sundays, and F<weekday.png> on all other days.
76		105
77	Fortunately, we expect that most expressions will be much simpler, with	106	Fortunately, we expect that most expressions will be much simpler, with
78	little Perl knowledge needed.	107	little Perl knowledge needed.
79		108
80	Basically, you always start with a function that "generates" an image	109	Basically, you always start with a function that "generates" an image
…		…
97	its result becomes the argument to the C<scale> function.	126	its result becomes the argument to the C<scale> function.
98		127
99	Many operators also allow some parameters preceding the input image	128	Many operators also allow some parameters preceding the input image
100	that modify its behaviour. For example, C<scale> without any additional	129	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	130	arguments scales the image to size of the terminal window. If you specify
102	an additional argument, it uses it as a percentage:	131	an additional argument, it uses it as a scale factor (multiply by 100 to
		132	get a percentage):
103		133
104	scale 200, load "$HOME/mypic.png"	134	scale 2, load "$HOME/mypic.png"
105		135
106	This enlarges the image by a factor of 2 (200%). As you can see, C<scale>	136	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	137	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	138	C<load> only has one argument. Arguments are separated from each other by
109	commas.	139	commas.
110		140
111	Scale also accepts two arguments, which are then separate factors for both	141	Scale also accepts two arguments, which are then separate factors for both
112	horizontal and vertical dimensions. For example, this halves the image	142	horizontal and vertical dimensions. For example, this halves the image
113	width and doubles the image height:	143	width and doubles the image height:
114		144
115	scale 50, 200, load "$HOME/mypic.png"	145	scale 0.5, 2, load "$HOME/mypic.png"
116		146
117	TODO	147	IF you try out these expressions, you might suffer from some sluggishness,
		148	because each time the terminal is resized, it loads the PNG image again
		149	and scales it. Scaling is usually fast (and unavoidable), but loading the
		150	image can be quite time consuming. This is where C<keep> comes in handy:
118		151
119	=head3 CYCLES AND CACHING	152	scale 0.5, 2, keep { load "$HOME/mypic.png" }
120		153
121	TODO	154	The C<keep> operator executes all the statements inside the braces only
		155	once, or when it thinks the outcome might change. In other cases it
		156	returns the last value computed by the brace block.
122		157
123	Each time the expression is reevaluated, a new cycle is said to have begun. Many operators	158	This means that the C<load> is only executed once, which makes it much
124	cache their results till the next cycle. For example	159	faster, but also means that more memory is being used, because the loaded
		160	image must be kept in memory at all times. In this expression, the
		161	trade-off is likely worth it.
125		162
		163	But back to effects: Other effects than scaling are also readily
		164	available, for example, you can tile the image to fill the whole window,
		165	instead of resizing it:
		166
		167	tile keep { load "$HOME/mypic.png" }
		168
		169	In fact, images returned by C<load> are in C<tile> mode by default, so the
		170	C<tile> operator is kind of superfluous.
		171
		172	Another common effect is to mirror the image, so that the same edges
		173	touch:
		174
		175	mirror keep { load "$HOME/mypic.png" }
		176
		177	Another common background expression is:
		178
		179	rootalign root
		180
		181	This one first takes a snapshot of the screen background image, and then
		182	moves it to the upper left corner of the screen (as opposed to the upper
		183	left corner of the terminal window)- the result is pseudo-transparency:
		184	the image seems to be static while the window is moved around.
		185
		186	=head2 COLOUR SPECIFICATIONS
		187
		188	Whenever an operator expects a "colour", then this can be specified in one
		189	of two ways: Either as string with an X11 colour specification, such as:
		190
		191	"red" # named colour
		192	"#f00" # simple rgb
		193	"[50]red" # red with 50% alpha
		194	"TekHVC:300/50/50" # anything goes
		195
		196	OR as an array reference with one, three or four components:
		197
		198	[0.5] # 50% gray, 100% alpha
		199	[0.5, 0, 0] # dark red, no green or blur, 100% alpha
		200	[0.5, 0, 0, 0.7] # same with explicit 70% alpha
		201
		202	=head2 CACHING AND SENSITIVITY
		203
		204	Since some operations (such as C<load> and C<blur>) can take a long time,
		205	caching results can be very important for a smooth operation. Caching can
		206	also be useful to reduce memory usage, though, for example, when an image
		207	is cached by C<load>, it could be shared by multiple terminal windows
		208	running inside urxvtd.
		209
		210	=head3 C<keep { ... }> caching
		211
		212	The most important way to cache expensive operations is to use C<keep {
		213	... }>. The C<keep> operator takes a block of multiple statements enclosed
		214	by C<{}> and keeps the return value in memory.
		215
		216	An expression can be "sensitive" to various external events, such as
		217	scaling or moving the window, root background changes and timers. Simply
		218	using an expression (such as C<scale> without parameters) that depends on
		219	certain changing values (called "variables"), or using those variables
		220	directly, will make an expression sensitive to these events - for example,
		221	using C<scale> or C<TW> will make the expression sensitive to the terminal
		222	size, and thus to resizing events.
		223
		224	When such an event happens, C<keep> will automatically trigger a
		225	reevaluation of the whole expression with the new value of the expression.
		226
		227	C<keep> is most useful for expensive operations, such as C<blur>:
		228
		229	rootalign keep { blur 20, root }
		230
		231	This makes a blurred copy of the root background once, and on subsequent
		232	calls, just root-aligns it. Since C<blur> is usually quite slow and
		233	C<rootalign> is quite fast, this trades extra memory (for the cached
		234	blurred pixmap) with speed (blur only needs to be redone when root
		235	changes).
		236
		237	=head3 C<load> caching
		238
		239	The C<load> operator itself does not keep images in memory, but as long as
		240	the image is still in memory, C<load> will use the in-memory image instead
		241	of loading it freshly from disk.
		242
		243	That means that this expression:
		244
		245	keep { load "$HOME/path..." }
		246
		247	Not only caches the image in memory, other terminal instances that try to
		248	C<load> it can reuse that in-memory copy.
		249
126	=head2 REFERENCE	250	=head1 REFERENCE
127		251
128	=head3 COMMAND LINE SWITCHES	252	=head2 COMMAND LINE SWITCHES
129		253
130	=over 4	254	=over 4
131		255
132	=item --background-expr perl-expression	256	=item --background-expr perl-expression
133		257
…		…
139	overwriting borders and any other areas, such as the scrollbar.	263	overwriting borders and any other areas, such as the scrollbar.
140		264
141	Specifying this flag changes the behaviour, so that the image only	265	Specifying this flag changes the behaviour, so that the image only
142	replaces the background of the character area.	266	replaces the background of the character area.
143		267
		268	=item --background-interval seconds
		269
		270	Since some operations in the underlying XRender extension can effectively
		271	freeze your X-server for prolonged time, this extension enforces a minimum
		272	time between updates, which is normally about 0.1 seconds.
		273
		274	If you want to do updates more often, you can decrease this safety
		275	interval with this switch.
		276
144	=back	277	=back
145		278
146	=cut	279	=cut
147		280
148	our $EXPR;#d#	281	our %_IMG_CACHE;
149	#$EXPR = 'move W * 0.1, -H * 0.1, resize W * 0.5, H * 0.5, repeat_none load "opensource.png"';
150	$EXPR = 'move -TX, -TY, load "argb.png"';
151	#$EXPR = '
152	# rotate W, H, 50, 50, counter 1/59.95, repeat_mirror,
153	# clip X, Y, W, H, repeat_mirror,
154	# load "/root/pix/das_fette_schwein.jpg"
155	#';
156	#$EXPR = 'solid "red"';
157	#$EXPR = 'blur root, 10, 10'
158	#$EXPR = 'blur move (root, -x, -y), 5, 5'
159	#resize load "/root/pix/das_fette_schwein.jpg", w, h
160
161	our $HOME;	282	our $HOME;
162	our ($self, $old, $new);	283	our ($self, $frame);
163	our ($x, $y, $w, $h);	284	our ($x, $y, $w, $h);
164		285
165	# enforce at least this interval between updates	286	# enforce at least this interval between updates
166	our $MIN_INTERVAL = 1/100;	287	our $MIN_INTERVAL = 6/59.951;
167		288
168	{	289	{
169	package urxvt::bgdsl; # background language	290	package urxvt::bgdsl; # background language
		291
		292	sub FR_PARENT() { 0 } # parent frame, if any - must be #0
		293	sub FR_CACHE () { 1 } # cached values
		294	sub FR_AGAIN () { 2 } # what this expr is sensitive to
		295	sub FR_STATE () { 3 } # watchers etc.
		296
		297	use List::Util qw(min max sum shuffle);
170		298
171	=head2 PROVIDERS/GENERATORS	299	=head2 PROVIDERS/GENERATORS
172		300
173	These functions provide an image, by loading it from disk, grabbing it	301	These functions provide an image, by loading it from disk, grabbing it
174	from the root screen or by simply generating it. They are used as starting	302	from the root screen or by simply generating it. They are used as starting
…		…
179	=item load $path	307	=item load $path
180		308
181	Loads the image at the given C<$path>. The image is set to plane tiling	309	Loads the image at the given C<$path>. The image is set to plane tiling
182	mode.	310	mode.
183		311
184	Loaded images will be cached for one cycle.	312	If the image is already in memory (e.g. because another terminal instance
		313	uses it), then the in-memory copy us returned instead.
185		314
		315	=item load_uc $path
		316
		317	Load uncached - same as load, but does not cache the image, which means it
		318	is I<always> loaded from the filesystem again, even if another copy of it
		319	is in memory at the time.
		320
186	=cut	321	=cut
		322
		323	sub load_uc($) {
		324	$self->new_img_from_file ($_[0])
		325	}
187		326
188	sub load($) {	327	sub load($) {
189	my ($path) = @_;	328	my ($path) = @_;
190		329
191	$new->{load}{$path} = $old->{load}{$path} \|\| $self->new_img_from_file ($path);	330	$_IMG_CACHE{$path} \|\| do {
		331	my $img = load_uc $path;
		332	Scalar::Util::weaken ($_IMG_CACHE{$path} = $img);
		333	$img
		334	}
192	}	335	}
193		336
194	=item root	337	=item root
195		338
196	Returns the root window pixmap, that is, hopefully, the background image	339	Returns the root window pixmap, that is, hopefully, the background image
197	of your screen. The image is set to extend mode.	340	of your screen.
198		341
199	This function makes your expression root sensitive, that means it will be	342	This function makes your expression root sensitive, that means it will be
200	reevaluated when the bg image changes.	343	reevaluated when the bg image changes.
201		344
202	=cut	345	=cut
203		346
204	sub root() {	347	sub root() {
205	$new->{rootpmap_sensitive} = 1;	348	$frame->[FR_AGAIN]{rootpmap} = 1;
206	die "root op not supported, exg, we need you";	349	$self->new_img_from_root
207	}	350	}
208		351
209	=item solid $colour	352	=item solid $colour
210		353
211	=item solid $width, $height, $colour	354	=item solid $width, $height, $colour
212		355
213	Creates a new image and completely fills it with the given colour. The	356	Creates a new image and completely fills it with the given colour. The
214	image is set to tiling mode.	357	image is set to tiling mode.
215		358
216	If <$width> and C<$height> are omitted, it creates a 1x1 image, which is	359	If C<$width> and C<$height> are omitted, it creates a 1x1 image, which is
217	useful for solid backgrounds or for use in filtering effects.	360	useful for solid backgrounds or for use in filtering effects.
218		361
219	=cut	362	=cut
220		363
221	sub solid($$;$) {	364	sub solid($;$$) {
222	my $colour = pop;	365	my $colour = pop;
223		366
224	my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] \|\| 1, $_[1] \|\| 1);	367	my $img = $self->new_img (urxvt::PictStandardARGB32, 0, 0, $_[0] \|\| 1, $_[1] \|\| 1);
225	$img->fill ($colour);	368	$img->fill ($colour);
226	$img	369	$img
227	}	370	}
228		371
229	=back	372	=item clone $img
230		373
231	=head2 VARIABLES	374	Returns an exact copy of the image. This is useful if you want to have
		375	multiple copies of the same image to apply different effects to.
232		376
233	The following functions provide variable data such as the terminal
234	window dimensions. Most of them make your expression sensitive to some
235	events, for example using C<TW> (terminal width) means your expression is
236	evaluated again when the terminal is resized.
237
238	=over 4
239
240	=item TX
241
242	=item TY
243
244	Return the X and Y coordinates of the terminal window (the terminal
245	window is the full window by default, and the character area only when in
246	border-respect mode).
247
248	Using these functions make your expression sensitive to window moves.
249
250	These functions are mainly useful to align images to the root window.
251
252	Example: load an image and align it so it looks as if anchored to the
253	background.
254
255	move -TX, -TY, load "mybg.png"
256
257	=item TW
258
259	Return the width (C<TW>) and height (C<TH>) of the terminal window (the
260	terminal window is the full window by default, and the character area only
261	when in border-respect mode).
262
263	Using these functions make your expression sensitive to window resizes.
264
265	These functions are mainly useful to scale images, or to clip images to
266	the window size to conserve memory.
267
268	Example: take the screen background, clip it to the window size, blur it a
269	bit, align it to the window position and use it as background.
270
271	clip move -TX, -TY, blur 5, root
272
273	=cut	377	=cut
274		378
275	sub TX() { $new->{position_sensitive} = 1; $x }
276	sub TY() { $new->{position_sensitive} = 1; $y }
277	sub TW() { $new->{size_sensitive} = 1; $w }
278	sub TH() { $new->{size_sensitive} = 1; $h }
279
280	=item now
281
282	Returns the current time as (fractional) seconds since the epoch.
283
284	Using this expression does I<not> make your expression sensitive to time,
285	but the next two functions do.
286
287	=item again $seconds
288
289	When this function is used the expression will be reevaluated again in
290	C<$seconds> seconds.
291
292	Example: load some image and rotate it according to the time of day (as if it were
293	the hour pointer of a clock). Update this image every minute.
294
295	again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"
296
297	=item counter $seconds
298
299	Like C<again>, but also returns an increasing counter value, starting at
300	0, which might be useful for some simple animation effects.
301
302	=cut
303
304	sub now() { urxvt::NOW }
305
306	sub again($) {
307	$new->{again} = $_[0];
308	}
309
310	sub counter($) {	379	sub clone($) {
311	$new->{again} = $_[0];	380	$_[0]->clone
312	$self->{counter} + 0	381	}
		382
		383	=item merge $img ...
		384
		385	Takes any number of images and merges them together, creating a single
		386	image containing them all. The tiling mode of the first image is used as
		387	the tiling mode of the resulting image.
		388
		389	This function is called automatically when an expression returns multiple
		390	images.
		391
		392	=cut
		393
		394	sub merge(@) {
		395	return $_[0] unless $#_;
		396
		397	# rather annoyingly clumsy, but optimisation is for another time
		398
		399	my $x0 = +1e9;
		400	my $y0 = +1e9;
		401	my $x1 = -1e9;
		402	my $y1 = -1e9;
		403
		404	for (@_) {
		405	my ($x, $y, $w, $h) = $_->geometry;
		406
		407	$x0 = $x if $x0 > $x;
		408	$y0 = $y if $y0 > $y;
		409
		410	$x += $w;
		411	$y += $h;
		412
		413	$x1 = $x if $x1 < $x;
		414	$y1 = $y if $y1 < $y;
		415	}
		416
		417	my $base = $self->new_img (urxvt::PictStandardARGB32, $x0, $y0, $x1 - $x0, $y1 - $y0);
		418	$base->repeat_mode ($_[0]->repeat_mode);
		419	$base->fill ([0, 0, 0, 0]);
		420
		421	$base->draw ($_)
		422	for @_;
		423
		424	$base
313	}	425	}
314		426
315	=back	427	=back
316		428
317	=head2 TILING MODES	429	=head2 TILING MODES
…		…
350	become transparent. This mode is most useful when you want to place an	462	become transparent. This mode is most useful when you want to place an
351	image over another image or the background colour while leaving all	463	image over another image or the background colour while leaving all
352	background pixels outside the image unchanged.	464	background pixels outside the image unchanged.
353		465
354	Example: load an image and display it in the upper left corner. The rest	466	Example: load an image and display it in the upper left corner. The rest
355	of the space is left "empty" (transparent or wahtever your compisotr does	467	of the space is left "empty" (transparent or whatever your compositor does
356	in alpha mode, else background colour).	468	in alpha mode, else background colour).
357		469
358	pad load "mybg.png"	470	pad load "mybg.png"
359		471
360	=item extend $img	472	=item extend $img
361		473
362	Extends the image over the whole plane, using the closest pixel in the	474	Extends the image over the whole plane, using the closest pixel in the
363	area outside the image. This mode is mostly useful when you more complex	475	area outside the image. This mode is mostly useful when you use more complex
364	filtering operations and want the pixels outside the image to have the	476	filtering operations and want the pixels outside the image to have the
365	same values as the pixels near the edge.	477	same values as the pixels near the edge.
366		478
367	Example: just for curiosity, how does this pixel extension stuff work?	479	Example: just for curiosity, how does this pixel extension stuff work?
368		480
…		…
394	$img	506	$img
395	}	507	}
396		508
397	=back	509	=back
398		510
399	=head2 PIXEL OPERATORS	511	=head2 VARIABLE VALUES
400		512
401	The following operators modify the image pixels in various ways.	513	The following functions provide variable data such as the terminal window
		514	dimensions. They are not (Perl-) variables, they just return stuff that
		515	varies. Most of them make your expression sensitive to some events, for
		516	example using C<TW> (terminal width) means your expression is evaluated
		517	again when the terminal is resized.
402		518
403	=over 4	519	=over 4
404		520
405	=item clone $img	521	=item TX
406		522
407	Returns an exact copy of the image.	523	=item TY
408		524
409	=cut	525	Return the X and Y coordinates of the terminal window (the terminal
		526	window is the full window by default, and the character area only when in
		527	border-respect mode).
410		528
		529	Using these functions make your expression sensitive to window moves.
		530
		531	These functions are mainly useful to align images to the root window.
		532
		533	Example: load an image and align it so it looks as if anchored to the
		534	background (that's exactly what C<rootalign> does btw.):
		535
		536	move -TX, -TY, keep { load "mybg.png" }
		537
		538	=item TW
		539
		540	=item TH
		541
		542	Return the width (C<TW>) and height (C<TH>) of the terminal window (the
		543	terminal window is the full window by default, and the character area only
		544	when in border-respect mode).
		545
		546	Using these functions make your expression sensitive to window resizes.
		547
		548	These functions are mainly useful to scale images, or to clip images to
		549	the window size to conserve memory.
		550
		551	Example: take the screen background, clip it to the window size, blur it a
		552	bit, align it to the window position and use it as background.
		553
		554	clip move -TX, -TY, keep { blur 5, root }
		555
		556	=cut
		557
		558	sub TX() { $frame->[FR_AGAIN]{position} = 1; $x }
		559	sub TY() { $frame->[FR_AGAIN]{position} = 1; $y }
		560	sub TW() { $frame->[FR_AGAIN]{size} = 1; $w }
		561	sub TH() { $frame->[FR_AGAIN]{size} = 1; $h }
		562
		563	=item now
		564
		565	Returns the current time as (fractional) seconds since the epoch.
		566
		567	Using this expression does I<not> make your expression sensitive to time,
		568	but the next two functions do.
		569
		570	=item again $seconds
		571
		572	When this function is used the expression will be reevaluated again in
		573	C<$seconds> seconds.
		574
		575	Example: load some image and rotate it according to the time of day (as if it were
		576	the hour pointer of a clock). Update this image every minute.
		577
		578	again 60;
		579	rotate 50, 50, (now % 86400) * -72 / 8640, scale keep { load "myclock.png" }
		580
		581	=item counter $seconds
		582
		583	Like C<again>, but also returns an increasing counter value, starting at
		584	0, which might be useful for some simple animation effects.
		585
		586	=cut
		587
		588	sub now() { urxvt::NOW }
		589
		590	sub again($) {
		591	$frame->[FR_AGAIN]{time} = $_[0];
		592	}
		593
411	sub clone($) {	594	sub counter($) {
412	$_[0]->clone	595	$frame->[FR_AGAIN]{time} = $_[0];
		596	$frame->[FR_STATE]{counter} + 0
413	}	597	}
		598
		599	=back
		600
		601	=head2 SHAPE CHANGING OPERATORS
		602
		603	The following operators modify the shape, size or position of the image.
		604
		605	=over 4
414		606
415	=item clip $img	607	=item clip $img
416		608
417	=item clip $width, $height, $img	609	=item clip $width, $height, $img
418		610
…		…
421	Clips an image to the given rectangle. If the rectangle is outside the	613	Clips an image to the given rectangle. If the rectangle is outside the
422	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is	614	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is
423	larger than the image, then the tiling mode defines how the extra pixels	615	larger than the image, then the tiling mode defines how the extra pixels
424	will be filled.	616	will be filled.
425		617
426	If C<$x> an C<$y> are missing, then C<0> is assumed for both.	618	If C<$x> and C<$y> are missing, then C<0> is assumed for both.
427		619
428	If C<$width> and C<$height> are missing, then the window size will be	620	If C<$width> and C<$height> are missing, then the window size will be
429	assumed.	621	assumed.
430		622
431	Example: load an image, blur it, and clip it to the window size to save	623	Example: load an image, blur it, and clip it to the window size to save
432	memory.	624	memory.
433		625
434	clip blur 10, load "mybg.png"	626	clip keep { blur 10, load "mybg.png" }
435		627
436	=cut	628	=cut
437		629
438	sub clip($;$$;$$) {	630	sub clip($;$$;$$) {
439	my $img = pop;	631	my $img = pop;
…		…
442	$img->sub_rect ($_[0], $_[1], $w, $h)	634	$img->sub_rect ($_[0], $_[1], $w, $h)
443	}	635	}
444		636
445	=item scale $img	637	=item scale $img
446		638
447	=item scale $size_percent, $img	639	=item scale $size_factor, $img
448		640
449	=item scale $width_percent, $height_percent, $img	641	=item scale $width_factor, $height_factor, $img
450		642
451	Scales the image by the given percentages in horizontal	643	Scales the image by the given factors in horizontal
452	(C<$width_percent>) and vertical (C<$height_percent>) direction.	644	(C<$width>) and vertical (C<$height>) direction.
453		645
454	If only one percentage is give, it is used for both directions.	646	If only one factor is give, it is used for both directions.
455		647
456	If no percentages are given, scales the image to the window size without	648	If no factors are given, scales the image to the window size without
457	keeping aspect.	649	keeping aspect.
458		650
459	=item resize $width, $height, $img	651	=item resize $width, $height, $img
460		652
461	Resizes the image to exactly C<$width> times C<$height> pixels.	653	Resizes the image to exactly C<$width> times C<$height> pixels.
462		654
463	=cut	655	=item fit $img
464		656
465	#TODO: maximise, maximise_fill?	657	=item fit $width, $height, $img
		658
		659	Fits the image into the given C<$width> and C<$height> without changing
		660	aspect, or the terminal size. That means it will be shrunk or grown until
		661	the whole image fits into the given area, possibly leaving borders.
		662
		663	=item cover $img
		664
		665	=item cover $width, $height, $img
		666
		667	Similar to C<fit>, but shrinks or grows until all of the area is covered
		668	by the image, so instead of potentially leaving borders, it will cut off
		669	image data that doesn't fit.
		670
		671	=cut
466		672
467	sub scale($;$;$) {	673	sub scale($;$;$) {
468	my $img = pop;	674	my $img = pop;
469		675
470	@_ == 2 ? $img->scale ($_[0] * $img->w * 0.01, $_[1] * $img->h * 0.01)	676	@_ == 2 ? $img->scale ($_[0] * $img->w, $_[1] * $img->h)
471	: @_ ? $img->scale ($_[0] * $img->w * 0.01, $_[0] * $img->h * 0.01)	677	: @_ ? $img->scale ($_[0] * $img->w, $_[0] * $img->h)
472	: $img->scale (TW, TH)	678	: $img->scale (TW, TH)
473	}	679	}
474		680
475	sub resize($$$) {	681	sub resize($$$) {
476	my $img = pop;	682	my $img = pop;
477	$img->scale ($_[0], $_[1])	683	$img->scale ($_[0], $_[1])
478	}	684	}
479		685
		686	sub fit($;$$) {
		687	my $img = pop;
		688	my $w = ($_[0] \|\| TW) / $img->w;
		689	my $h = ($_[1] \|\| TH) / $img->h;
		690	scale +(min $w, $h), $img
		691	}
		692
		693	sub cover($;$$) {
		694	my $img = pop;
		695	my $w = ($_[0] \|\| TW) / $img->w;
		696	my $h = ($_[1] \|\| TH) / $img->h;
		697	scale +(max $w, $h), $img
		698	}
		699
480	=item move $dx, $dy, $img	700	=item move $dx, $dy, $img
481		701
482	Moves the image by C<$dx> pixels in the horizontal, and C<$dy> pixels in	702	Moves the image by C<$dx> pixels in the horizontal, and C<$dy> pixels in
483	the vertical.	703	the vertical.
484		704
485	Example: move the image right by 20 pixels and down by 30.	705	Example: move the image right by 20 pixels and down by 30.
486		706
487	move 20, 30, ...	707	move 20, 30, ...
		708
		709	=item align $xalign, $yalign, $img
		710
		711	Aligns the image according to a factor - C<0> means the image is moved to
		712	the left or top edge (for C<$xalign> or C<$yalign>), C<0.5> means it is
		713	exactly centered and C<1> means it touches the right or bottom edge.
		714
		715	Example: remove any visible border around an image, center it vertically but move
		716	it to the right hand side.
		717
		718	align 1, 0.5, pad $img
		719
		720	=item center $img
		721
		722	=item center $width, $height, $img
		723
		724	Centers the image, i.e. the center of the image is moved to the center of
		725	the terminal window (or the box specified by C<$width> and C<$height> if
		726	given).
		727
		728	Example: load an image and center it.
		729
		730	center keep { pad load "mybg.png" }
488		731
489	=item rootalign $img	732	=item rootalign $img
490		733
491	Moves the image so that it appears glued to the screen as opposed to the	734	Moves the image so that it appears glued to the screen as opposed to the
492	window. This gives the illusion of a larger area behind the window. It is	735	window. This gives the illusion of a larger area behind the window. It is
493	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the	736	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the
494	top left of the screen.	737	top left of the screen.
495		738
496	Example: load a background image, put it in mirror mode and root align it.	739	Example: load a background image, put it in mirror mode and root align it.
497		740
498	rootalign mirror load "mybg.png"	741	rootalign keep { mirror load "mybg.png" }
499		742
500	Example: take the screen background and align it, giving the illusion of	743	Example: take the screen background and align it, giving the illusion of
501	transparency as long as the window isn't in front of other windows.	744	transparency as long as the window isn't in front of other windows.
502		745
503	rootalign root	746	rootalign root
504		747
505	=cut	748	=cut
506		749
507	sub move($$;$) {	750	sub move($$;$) {
508	my $img = pop->clone;	751	my $img = pop->clone;
509	$img->move ($_[0], $_[1]);	752	$img->move ($_[0], $_[1]);
510	$img	753	$img
511	}	754	}
512		755
		756	sub align($;$$) {
		757	my $img = pop;
		758
		759	move $_[0] * (TW - $img->w),
		760	$_[1] * (TH - $img->h),
		761	$img
		762	}
		763
		764	sub center($;$$) {
		765	my $img = pop;
		766	my $w = $_[0] \|\| TW;
		767	my $h = $_[1] \|\| TH;
		768
		769	move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img
		770	}
		771
513	sub rootalign($) {	772	sub rootalign($) {
514	move -TX, -TY, $_[0]	773	move -TX, -TY, $_[0]
515	}	774	}
516		775
		776	=item rotate $center_x, $center_y, $degrees, $img
		777
		778	Rotates the image clockwise by C<$degrees> degrees, around the point at
		779	C<$center_x> and C<$center_y> (specified as factor of image width/height).
		780
		781	Example: rotate the image by 90 degrees around it's center.
		782
		783	rotate 0.5, 0.5, 90, keep { load "$HOME/mybg.png" }
		784
		785	=cut
		786
		787	sub rotate($$$$) {
		788	my $img = pop;
		789	$img->rotate (
		790	$_[0] * ($img->w + $img->x),
		791	$_[1] * ($img->h + $img->y),
		792	$_[2] * (3.14159265 / 180),
		793	)
		794	}
		795
		796	=back
		797
		798	=head2 COLOUR MODIFICATIONS
		799
		800	The following operators change the pixels of the image.
		801
		802	=over 4
		803
		804	=item tint $color, $img
		805
		806	Tints the image in the given colour.
		807
		808	Example: tint the image red.
		809
		810	tint "red", load "rgb.png"
		811
		812	Example: the same, but specify the colour by component.
		813
		814	tint [1, 0, 0], load "rgb.png"
		815
		816	=cut
		817
		818	sub tint($$) {
		819	$_[1]->tint ($_[0])
		820	}
		821
517	=item contrast $factor, $img	822	=item contrast $factor, $img
518		823
519	=item contrast $r, $g, $b, $img	824	=item contrast $r, $g, $b, $img
520		825
521	=item contrast $r, $g, $b, $a, $img	826	=item contrast $r, $g, $b, $a, $img
522		827
523	Adjusts the I<contrast> of an image.	828	Adjusts the I<contrast> of an image.
524		829
525	#TODO#	830	The first form applies a single C<$factor> to red, green and blue, the
		831	second form applies separate factors to each colour channel, and the last
		832	form includes the alpha channel.
526		833
		834	Values from 0 to 1 lower the contrast, values higher than 1 increase the
		835	contrast.
		836
		837	Due to limitations in the underlying XRender extension, lowering contrast
		838	also reduces brightness, while increasing contrast currently also
		839	increases brightness.
		840
527	=item brightness $factor, $img	841	=item brightness $bias, $img
528		842
529	=item brightness $r, $g, $b, $img	843	=item brightness $r, $g, $b, $img
530		844
531	=item brightness $r, $g, $b, $a, $img	845	=item brightness $r, $g, $b, $a, $img
532		846
533	Adjusts the brightness of an image.	847	Adjusts the brightness of an image.
		848
		849	The first form applies a single C<$bias> to red, green and blue, the
		850	second form applies separate biases to each colour channel, and the last
		851	form includes the alpha channel.
		852
		853	Values less than 0 reduce brightness, while values larger than 0 increase
		854	it. Useful range is from -1 to 1 - the former results in a black, the
		855	latter in a white picture.
		856
		857	Due to idiosyncrasies in the underlying XRender extension, biases less
		858	than zero can be I<very> slow.
		859
		860	You can also try the experimental(!) C<muladd> operator.
534		861
535	=cut	862	=cut
536		863
537	sub contrast($$;$$;$) {	864	sub contrast($$;$$;$) {
538	my $img = pop;	865	my $img = pop;
539	my ($r, $g, $b, $a) = @_;	866	my ($r, $g, $b, $a) = @_;
540		867
541	($g, $b) = ($r, $r) if @_ < 4;	868	($g, $b) = ($r, $r) if @_ < 3;
542	$a = 1 if @_ < 5;	869	$a = 1 if @_ < 4;
543		870
544	$img = $img->clone;	871	$img = $img->clone;
545	$img->contrast ($r, $g, $b, $a);	872	$img->contrast ($r, $g, $b, $a);
546	$img	873	$img
547	}	874	}
548		875
549	sub brightness($$;$$;$) {	876	sub brightness($$;$$;$) {
550	my $img = pop;	877	my $img = pop;
551	my ($r, $g, $b, $a) = @_;	878	my ($r, $g, $b, $a) = @_;
552		879
553	($g, $b) = ($r, $r) if @_ < 4;	880	($g, $b) = ($r, $r) if @_ < 3;
554	$a = 1 if @_ < 5;	881	$a = 1 if @_ < 4;
555		882
556	$img = $img->clone;	883	$img = $img->clone;
557	$img->brightness ($r, $g, $b, $a);	884	$img->brightness ($r, $g, $b, $a);
558	$img	885	$img
559	}	886	}
560		887
		888	=item muladd $mul, $add, $img # EXPERIMENTAL
		889
		890	First multipliesthe pixels by C<$mul>, then adds C<$add>. This cna be used
		891	to implement brightness and contrast at the same time, with a wider value
		892	range than contrast and brightness operators.
		893
		894	Due to numerous bugs in XRender implementations, it can also introduce a
		895	number of visual artifacts.
		896
		897	Example: increase contrast by a factor of C<$c> without changing image
		898	brightness too much.
		899
		900	muladd $c, (1 - $c) * 0.5, $img
		901
		902	=cut
		903
		904	sub muladd($$$) {
		905	$_[2]->muladd ($_[0], $_[1])
		906	}
		907
561	=item blur $radius, $img	908	=item blur $radius, $img
562		909
563	=item blur $radius_horz, $radius_vert, $img	910	=item blur $radius_horz, $radius_vert, $img
564		911
565	Gaussian-blurs the image with (roughly) C<$radius> pixel radius. The radii	912	Gaussian-blurs the image with (roughly) C<$radius> pixel radius. The radii
566	can also be specified separately.	913	can also be specified separately.
		914
		915	Blurring is often I<very> slow, at least compared or other
		916	operators. Larger blur radii are slower than smaller ones, too, so if you
		917	don't want to freeze your screen for long times, start experimenting with
		918	low values for radius (<5).
567		919
568	=cut	920	=cut
569		921
570	sub blur($$;$) {	922	sub blur($$;$) {
571	my $img = pop;	923	my $img = pop;
572	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])	924	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
573	}	925	}
574		926
575	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees
576
577	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
578	pointer at C<$center_x> and C<$center_y> (specified as percentage of image
579	width/height), generating a new image with width C<$new_width> and height
580	C<$new_height>.
581
582	#TODO# new width, height, maybe more operators?
583
584	Example: rotate the image by 90 degrees
585
586	=cut
587
588	sub rotate($$$$$$) {
589	my $img = pop;
590	$img->rotate (
591	$_[0],
592	$_[1],
593	$_[2] * $img->w * .01,
594	$_[3] * $img->h * .01,
595	$_[4] * (3.14159265 / 180),
596	)
597	}
598
599	=back	927	=back
600		928
		929	=head2 OTHER STUFF
		930
		931	Anything that didn't fit any of the other categories, even after applying
		932	force and closing our eyes.
		933
		934	=over 4
		935
		936	=item keep { ... }
		937
		938	This operator takes a code block as argument, that is, one or more
		939	statements enclosed by braces.
		940
		941	The trick is that this code block is only evaluated when the outcome
		942	changes - on other calls the C<keep> simply returns the image it computed
		943	previously (yes, it should only be used with images). Or in other words,
		944	C<keep> I<caches> the result of the code block so it doesn't need to be
		945	computed again.
		946
		947	This can be extremely useful to avoid redoing slow operations - for
		948	example, if your background expression takes the root background, blurs it
		949	and then root-aligns it it would have to blur the root background on every
		950	window move or resize.
		951
		952	Another example is C<load>, which can be quite slow.
		953
		954	In fact, urxvt itself encloses the whole expression in some kind of
		955	C<keep> block so it only is reevaluated as required.
		956
		957	Putting the blur into a C<keep> block will make sure the blur is only done
		958	once, while the C<rootalign> is still done each time the window moves.
		959
		960	rootalign keep { blur 10, root }
		961
		962	This leaves the question of how to force reevaluation of the block,
		963	in case the root background changes: If expression inside the block
		964	is sensitive to some event (root background changes, window geometry
		965	changes), then it will be reevaluated automatically as needed.
		966
		967	=cut
		968
		969	sub keep(&) {
		970	my $id = $_[0]+0;
		971
		972	local $frame = $self->{frame_cache}{$id} \|\|= [$frame];
		973
		974	unless ($frame->[FR_CACHE]) {
		975	$frame->[FR_CACHE] = [ $_[0]() ];
		976
		977	my $self = $self;
		978	my $frame = $frame;
		979	Scalar::Util::weaken $frame;
		980	$self->compile_frame ($frame, sub {
		981	# clear this frame cache, also for all parents
		982	for (my $frame = $frame; $frame; $frame = $frame->[0]) {
		983	undef $frame->[FR_CACHE];
		984	}
		985
		986	$self->recalculate;
		987	});
		988	};
		989
		990	# in scalar context we always return the first original result, which
		991	# is not quite how perl works.
		992	wantarray
		993	? @{ $frame->[FR_CACHE] }
		994	: $frame->[FR_CACHE][0]
		995	}
		996
		997	# sub keep_clear() {
		998	# delete $self->{frame_cache};
		999	# }
		1000
		1001	=back
		1002
601	=cut	1003	=cut
602		1004
603	}	1005	}
604		1006
605	sub parse_expr {	1007	sub parse_expr {
606	my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}";	1008	my $expr = eval
		1009	"sub {\n"
		1010	. "package urxvt::bgdsl;\n"
		1011	. "#line 0 'background expression'\n"
		1012	. "$_[0]\n"
		1013	. "}";
607	die if $@;	1014	die if $@;
608	$expr	1015	$expr
609	}	1016	}
610		1017
611	# compiles a parsed expression	1018	# compiles a parsed expression
612	sub set_expr {	1019	sub set_expr {
613	my ($self, $expr) = @_;	1020	my ($self, $expr) = @_;
614		1021
		1022	$self->{root} = []; # the outermost frame
615	$self->{expr} = $expr;	1023	$self->{expr} = $expr;
616	$self->recalculate;	1024	$self->recalculate;
		1025	}
		1026
		1027	# takes a hash of sensitivity indicators and installs watchers
		1028	sub compile_frame {
		1029	my ($self, $frame, $cb) = @_;
		1030
		1031	my $state = $frame->[urxvt::bgdsl::FR_STATE] \|\|= {};
		1032	my $again = $frame->[urxvt::bgdsl::FR_AGAIN];
		1033
		1034	# don't keep stuff alive
		1035	Scalar::Util::weaken $state;
		1036
		1037	if ($again->{nested}) {
		1038	$state->{nested} = 1;
		1039	} else {
		1040	delete $state->{nested};
		1041	}
		1042
		1043	if (my $interval = $again->{time}) {
		1044	$state->{time} = [$interval, urxvt::timer->new->after ($interval)->interval ($interval)]
		1045	if $state->{time}[0] != $interval;
		1046
		1047	# callback might have changed, although we could just rule that out
		1048	$state->{time}[1]->cb (sub {
		1049	++$state->{counter};
		1050	$cb->();
		1051	});
		1052	} else {
		1053	delete $state->{time};
		1054	}
		1055
		1056	if ($again->{position}) {
		1057	$state->{position} = $self->on (position_change => $cb);
		1058	} else {
		1059	delete $state->{position};
		1060	}
		1061
		1062	if ($again->{size}) {
		1063	$state->{size} = $self->on (size_change => $cb);
		1064	} else {
		1065	delete $state->{size};
		1066	}
		1067
		1068	if ($again->{rootpmap}) {
		1069	$state->{rootpmap} = $self->on (rootpmap_change => $cb);
		1070	} else {
		1071	delete $state->{rootpmap};
		1072	}
617	}	1073	}
618		1074
619	# evaluate the current bg expression	1075	# evaluate the current bg expression
620	sub recalculate {	1076	sub recalculate {
621	my ($arg_self) = @_;	1077	my ($arg_self) = @_;
…		…
631		1087
632	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;	1088	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;
633		1089
634	# set environment to evaluate user expression	1090	# set environment to evaluate user expression
635		1091
636	local $self = $arg_self;	1092	local $self = $arg_self;
637
638	local $HOME = $ENV{HOME};	1093	local $HOME = $ENV{HOME};
639	local $old = $self->{state};	1094	local $frame = $self->{root};
640	local $new = my $state = $self->{state} = {};
641		1095
642	($x, $y, $w, $h) =
643	$self->background_geometry ($self->{border});	1096	($x, $y, $w, $h) = $self->background_geometry ($self->{border});
644		1097
645	# evaluate user expression	1098	# evaluate user expression
646		1099
647	my $img = eval { $self->{expr}->() };	1100	my @img = eval { $self->{expr}->() };
648	warn $@ if $@;#d#	1101	die $@ if $@;
		1102	die "background-expr did not return anything.\n" unless @img;
		1103	die "background-expr: expected image(s), got something else.\n"
649	die if !UNIVERSAL::isa $img, "urxvt::img";	1104	if grep { !UNIVERSAL::isa $_, "urxvt::img" } @img;
650		1105
651	$state->{size_sensitive} = 1	1106	my $img = urxvt::bgdsl::merge @img;
		1107
		1108	$frame->[FR_AGAIN]{size} = 1
652	if $img->repeat_mode != urxvt::RepeatNormal;	1109	if $img->repeat_mode != urxvt::RepeatNormal;
653		1110
654	# if the expression is sensitive to external events, prepare reevaluation then	1111	# if the expression is sensitive to external events, prepare reevaluation then
655		1112	$self->compile_frame ($frame, sub { $arg_self->recalculate });
656	my $repeat;
657
658	if (my $again = $state->{again}) {
659	$repeat = 1;
660	my $self = $self;
661	$state->{timer} = $again == $old->{again}
662	? $old->{timer}
663	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
664	++$self->{counter};
665	$self->recalculate
666	});
667	}
668
669	if (delete $state->{position_sensitive}) {
670	$repeat = 1;
671	$self->enable (position_change => sub { $_[0]->recalculate });
672	} else {
673	$self->disable ("position_change");
674	}
675
676	if (delete $state->{size_sensitive}) {
677	$repeat = 1;
678	$self->enable (size_change => sub { $_[0]->recalculate });
679	} else {
680	$self->disable ("size_change");
681	}
682
683	if (delete $state->{rootpmap_sensitive}) {
684	$repeat = 1;
685	$self->enable (rootpmap_change => sub { $_[0]->recalculate });
686	} else {
687	$self->disable ("rootpmap_change");
688	}
689		1113
690	# clear stuff we no longer need	1114	# clear stuff we no longer need
691		1115
692	%$old = ();	1116	# unless (%{ $frame->[FR_STATE] }) {
693
694	unless ($repeat) {
695	delete $self->{state};	1117	# delete $self->{state};
696	delete $self->{expr};	1118	# delete $self->{expr};
697	}	1119	# }
698		1120
699	# set background pixmap	1121	# set background pixmap
700		1122
701	$self->set_background ($img, $self->{border});	1123	$self->set_background ($img, $self->{border});
702	$self->scr_recolour (0);	1124	$self->scr_recolour (0);
…		…
704	}	1126	}
705		1127
706	sub on_start {	1128	sub on_start {
707	my ($self) = @_;	1129	my ($self) = @_;
708		1130
709	my $expr = $self->x_resource ("background.expr")	1131	my $expr = $self->x_resource ("%.expr")
710	or return;	1132	or return;
711		1133
		1134	$self->has_render
		1135	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";
		1136
712	$self->set_expr (parse_expr $expr);	1137	$self->set_expr (parse_expr $expr);
713	$self->{border} = $self->x_resource_boolean ("background.border");	1138	$self->{border} = $self->x_resource_boolean ("%.border");
		1139
		1140	$MIN_INTERVAL = $self->x_resource ("%.interval");
714		1141
715	()	1142	()
716	}	1143	}
717		1144

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.38 by root, Fri Jun 8 21:48:07 2012 UTC vs. Revision 1.79 by root, Tue Sep 4 22:41:11 2012 UTC

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Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.38 by root, Fri Jun 8 21:48:07 2012 UTC vs.
Revision 1.79 by root, Tue Sep 4 22:41:11 2012 UTC