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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.41 by root, Fri Jun 8 22:21:48 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		5	#:META:X_RESOURCE:%.interval:seconds:minimum time between updates
6	#TODO: once, rootalign
7		6
8	=head1 NAME	7	=head1 NAME
9		8
10	background - manage terminal background	9	background - manage terminal background
11		10
12	=head1 SYNOPSIS	11	=head1 SYNOPSIS
13		12
14	urxvt --background-expr 'background expression'	13	urxvt --background-expr 'background expression'
15	--background-border	14	--background-border
		15	--background-interval seconds
		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 }
16		40
17	=head1 DESCRIPTION	41	=head1 DESCRIPTION
18		42
19	This extension manages the terminal background by creating a picture that	43	This extension manages the terminal background by creating a picture that
20	is behind the text, replacing the normal background colour.	44	is behind the text, replacing the normal background colour.
26	to be as simple as possible.	50	to be as simple as possible.
27		51
28	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
29	use:	53	use:
30		54
31	urxvt --background-expr 'scale load "/path/to/mybg.png"'	55	urxvt --background-expr 'scale keep { load "/path/to/mybg.png" }'
32		56
33	Or specified as a X resource:	57	Or specified as a X resource:
34		58
35	URxvt.background-expr: scale load "/path/to/mybg.png"	59	URxvt.background-expr: scale keep { load "/path/to/mybg.png" }
36		60
37	=head1 THEORY OF OPERATION	61	=head1 THEORY OF OPERATION
38		62
39	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
40	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
…		…
53	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
54	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
55	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
56	timer elapses), then the expression will be evaluated again.	80	timer elapses), then the expression will be evaluated again.
57		81
58	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"
59	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
60	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
61	example. That ensures that the picture always fills the terminal, even	85	example. That ensures that the picture always fills the terminal, even
62	after it's size changes.	86	after its size changes.
63		87
64	=head2 EXPRESSIONS	88	=head2 EXPRESSIONS
65		89
66	Expressions are normal Perl expressions, in fact, they are Perl blocks -	90	Expressions are normal Perl expressions, in fact, they are Perl blocks -
67	which means you could use multiple lines and statements:	91	which means you could use multiple lines and statements:
68		92
		93	scale keep {
69	again 3600;	94	again 3600;
70	if (localtime now)[6]) {	95	if (localtime now)[6]) {
71	return scale load "$HOME/weekday.png";	96	return load "$HOME/weekday.png";
72	} else {	97	} else {
73	return scale load "$HOME/sunday.png";	98	return load "$HOME/sunday.png";
		99	}
74	}	100	}
75		101
76	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
77	background on Sundays, and F<weekday.png> on all other days.	104	Sundays, and F<weekday.png> on all other days.
78		105
79	Fortunately, we expect that most expressions will be much simpler, with	106	Fortunately, we expect that most expressions will be much simpler, with
80	little Perl knowledge needed.	107	little Perl knowledge needed.
81		108
82	Basically, you always start with a function that "generates" an image	109	Basically, you always start with a function that "generates" an image
…		…
99	its result becomes the argument to the C<scale> function.	126	its result becomes the argument to the C<scale> function.
100		127
101	Many operators also allow some parameters preceding the input image	128	Many operators also allow some parameters preceding the input image
102	that modify its behaviour. For example, C<scale> without any additional	129	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	130	arguments scales the image to size of the terminal window. If you specify
104	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):
105		133
106	scale 200, load "$HOME/mypic.png"	134	scale 2, load "$HOME/mypic.png"
107		135
108	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>
109	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
110	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
111	commas.	139	commas.
112		140
113	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
114	horizontal and vertical dimensions. For example, this halves the image	142	horizontal and vertical dimensions. For example, this halves the image
115	width and doubles the image height:	143	width and doubles the image height:
116		144
117	scale 50, 200, load "$HOME/mypic.png"	145	scale 0.5, 2, load "$HOME/mypic.png"
118		146
119	Other effects than scalign are also readily available, for exmaple, you can	147	IF you try out these expressions, you might suffer from some sluggishness,
120	tile the image to fill the whole window, instead of resizing it:	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:
121		151
		152	scale 0.5, 2, keep { load "$HOME/mypic.png" }
		153
		154	The C<keep> operator executes all the statements inside the braces only
		155	once, or when it thinks the outcome might change. In other cases it
		156	returns the last value computed by the brace block.
		157
		158	This means that the C<load> is only executed once, which makes it much
		159	faster, but also means that more memory is being used, because the loaded
		160	image must be kept in memory at all times. In this expression, the
		161	trade-off is likely worth it.
		162
		163	But back to effects: Other effects than scaling are also readily
		164	available, for example, you can tile the image to fill the whole window,
		165	instead of resizing it:
		166
122	tile load "$HOME/mypic.png"	167	tile keep { load "$HOME/mypic.png" }
123		168
124	In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator	169	In fact, images returned by C<load> are in C<tile> mode by default, so the
125	is kind of superfluous.	170	C<tile> operator is kind of superfluous.
126		171
127	Another common effect is to mirror the image, so that the same edges touch:	172	Another common effect is to mirror the image, so that the same edges
		173	touch:
128		174
129	mirror load "$HOME/mypic.png"	175	mirror keep { load "$HOME/mypic.png" }
130		176
131	This is also a typical background expression:	177	Another common background expression is:
132		178
133	rootalign root	179	rootalign root
134		180
135	It first takes a snapshot of the screen background image, and then	181	This one 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	182	moves it to the upper left corner of the screen (as opposed to the upper
137	pseudo-transparency, as the image seems to be static while the window is	183	left corner of the terminal window)- the result is pseudo-transparency:
138	moved around.	184	the image seems to be static while the window is moved around.
139		185
140	=head2 CYCLES AND CACHING	186	=head2 COLOUR SPECIFICATIONS
141		187
142	As has been mentioned before, the expression might be evaluated multiple	188	Whenever an operator expects a "colour", then this can be specified in one
143	times. Each time the expression is reevaluated, a new cycle is said to	189	of two ways: Either as string with an X11 colour specification, such as:
144	have begun. Many operators cache their results till the next cycle.
145		190
146	For example, the C<load> operator keeps a copy of the image. If it is	191	"red" # named colour
147	asked to load the same image on the next cycle it will not load it again,	192	"#f00" # simple rgb
148	but return the cached copy.	193	"[50]red" # red with 50% alpha
		194	"TekHVC:300/50/50" # anything goes
149		195
150	This only works for one cycle though, so as long as you load the same	196	OR as an array reference with one, three or four components:
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		197
154	This allows you to either speed things up by keeping multiple images in	198	[0.5] # 50% gray, 100% alpha
155	memory, or comserve memory by loading images more often.	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
156		201
157	For example, you can keep two images in memory and use a random one like	202	=head2 CACHING AND SENSITIVITY
158	this:
159		203
160	my $img1 = load "img1.png";	204	Since some operations (such as C<load> and C<blur>) can take a long time,
161	my $img2 = load "img2.png";	205	caching results can be very important for a smooth operation. Caching can
162	(0.5 > rand) ? $img1 : $img2	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.
163		209
164	Since both images are "loaded" every time the expression is evaluated,	210	=head3 C<keep { ... }> caching
165	they are always kept in memory. Contrast this version:
166		211
167	my $path1 = "img1.png";	212	The most important way to cache expensive operations is to use C<keep {
168	my $path2 = "img2.png";	213	... }>. The C<keep> operator takes a block of multiple statements enclosed
169	load ((0.5 > rand) ? $path1 : $path2)	214	by C<{}> and keeps the return value in memory.
170		215
171	Here, a path is selected randomly, and load is only called for one image,	216	An expression can be "sensitive" to various external events, such as
172	so keeps only one image in memory. If, on the next evaluation, luck	217	scaling or moving the window, root background changes and timers. Simply
173	decides to use the other path, then it will have to load that image again.	218	using an expression (such as C<scale> without parameters) that depends on
		219	certain changing values (called "variables"), or using those variables
		220	directly, will make an expression sensitive to these events - for example,
		221	using C<scale> or C<TW> will make the expression sensitive to the terminal
		222	size, and thus to resizing events.
		223
		224	When such an event happens, C<keep> will automatically trigger a
		225	reevaluation of the whole expression with the new value of the expression.
		226
		227	C<keep> is most useful for expensive operations, such as C<blur>:
		228
		229	rootalign keep { blur 20, root }
		230
		231	This makes a blurred copy of the root background once, and on subsequent
		232	calls, just root-aligns it. Since C<blur> is usually quite slow and
		233	C<rootalign> is quite fast, this trades extra memory (for the cached
		234	blurred pixmap) with speed (blur only needs to be redone when root
		235	changes).
		236
		237	=head3 C<load> caching
		238
		239	The C<load> operator itself does not keep images in memory, but as long as
		240	the image is still in memory, C<load> will use the in-memory image instead
		241	of loading it freshly from disk.
		242
		243	That means that this expression:
		244
		245	keep { load "$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.
174		249
175	=head1 REFERENCE	250	=head1 REFERENCE
176		251
177	=head2 COMMAND LINE SWITCHES	252	=head2 COMMAND LINE SWITCHES
178		253
…		…
188	overwriting borders and any other areas, such as the scrollbar.	263	overwriting borders and any other areas, such as the scrollbar.
189		264
190	Specifying this flag changes the behaviour, so that the image only	265	Specifying this flag changes the behaviour, so that the image only
191	replaces the background of the character area.	266	replaces the background of the character area.
192		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
193	=back	277	=back
194		278
195	=cut	279	=cut
196		280
		281	our %_IMG_CACHE;
197	our $HOME;	282	our $HOME;
198	our ($self, $old, $new);	283	our ($self, $frame);
199	our ($x, $y, $w, $h);	284	our ($x, $y, $w, $h);
200		285
201	# enforce at least this interval between updates	286	# enforce at least this interval between updates
202	our $MIN_INTERVAL = 1/100;	287	our $MIN_INTERVAL = 6/59.951;
203		288
204	{	289	{
205	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);
206		298
207	=head2 PROVIDERS/GENERATORS	299	=head2 PROVIDERS/GENERATORS
208		300
209	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
210	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
…		…
215	=item load $path	307	=item load $path
216		308
217	Loads the image at the given C<$path>. The image is set to plane tiling	309	Loads the image at the given C<$path>. The image is set to plane tiling
218	mode.	310	mode.
219		311
220	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.
221		314
		315	=item load_uc $path
		316
		317	Load uncached - same as load, but does not cache the image, which means it
		318	is I<always> loaded from the filesystem again, even if another copy of it
		319	is in memory at the time.
		320
222	=cut	321	=cut
		322
		323	sub load_uc($) {
		324	$self->new_img_from_file ($_[0])
		325	}
223		326
224	sub load($) {	327	sub load($) {
225	my ($path) = @_;	328	my ($path) = @_;
226		329
227	$new->{load}{$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	}
228	}	335	}
229		336
230	=item root	337	=item root
231		338
232	Returns the root window pixmap, that is, hopefully, the background image	339	Returns the root window pixmap, that is, hopefully, the background image
233	of your screen. The image is set to extend mode.	340	of your screen.
234		341
235	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
236	reevaluated when the bg image changes.	343	reevaluated when the bg image changes.
237		344
238	=cut	345	=cut
239		346
240	sub root() {	347	sub root() {
241	$new->{rootpmap_sensitive} = 1;	348	$frame->[FR_AGAIN]{rootpmap} = 1;
242	die "root op not supported, exg, we need you";	349	$self->new_img_from_root
243	}	350	}
244		351
245	=item solid $colour	352	=item solid $colour
246		353
247	=item solid $width, $height, $colour	354	=item solid $width, $height, $colour
…		…
252	If C<$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
253	useful for solid backgrounds or for use in filtering effects.	360	useful for solid backgrounds or for use in filtering effects.
254		361
255	=cut	362	=cut
256		363
257	sub solid($$;$) {	364	sub solid($;$$) {
258	my $colour = pop;	365	my $colour = pop;
259		366
260	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);
261	$img->fill ($colour);	368	$img->fill ($colour);
262	$img	369	$img
263	}	370	}
264		371
265	=back	372	=item clone $img
266		373
267	=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.
268		376
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	377	=cut
311		378
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} = $_[0];
345	}
346
347	sub counter($) {	379	sub clone($) {
348	$new->{again} = $_[0];	380	$_[0]->clone
349	$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
350	}	425	}
351		426
352	=back	427	=back
353		428
354	=head2 TILING MODES	429	=head2 TILING MODES
…		…
387	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
388	image over another image or the background colour while leaving all	463	image over another image or the background colour while leaving all
389	background pixels outside the image unchanged.	464	background pixels outside the image unchanged.
390		465
391	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
392	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
393	in alpha mode, else background colour).	468	in alpha mode, else background colour).
394		469
395	pad load "mybg.png"	470	pad load "mybg.png"
396		471
397	=item extend $img	472	=item extend $img
398		473
399	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
400	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
401	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
402	same values as the pixels near the edge.	477	same values as the pixels near the edge.
403		478
404	Example: just for curiosity, how does this pixel extension stuff work?	479	Example: just for curiosity, how does this pixel extension stuff work?
405		480
…		…
431	$img	506	$img
432	}	507	}
433		508
434	=back	509	=back
435		510
436	=head2 PIXEL OPERATORS	511	=head2 VARIABLE VALUES
437		512
438	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.
439		518
440	=over 4	519	=over 4
441		520
442	=item clone $img	521	=item TX
443		522
444	Returns an exact copy of the image.	523	=item TY
445		524
446	=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).
447		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} = $_[0];
		592	}
		593
448	sub clone($) {	594	sub counter($) {
449	$_[0]->clone	595	$frame->[FR_AGAIN]{time} = $_[0];
		596	$frame->[FR_STATE]{counter} + 0
450	}	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
451		606
452	=item clip $img	607	=item clip $img
453		608
454	=item clip $width, $height, $img	609	=item clip $width, $height, $img
455		610
…		…
458	Clips an image to the given rectangle. If the rectangle is outside the	613	Clips an image to the given rectangle. If the rectangle is outside the
459	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is	614	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is
460	larger than the image, then the tiling mode defines how the extra pixels	615	larger than the image, then the tiling mode defines how the extra pixels
461	will be filled.	616	will be filled.
462		617
463	If C<$x> an C<$y> are missing, then C<0> is assumed for both.	618	If C<$x> and C<$y> are missing, then C<0> is assumed for both.
464		619
465	If C<$width> and C<$height> are missing, then the window size will be	620	If C<$width> and C<$height> are missing, then the window size will be
466	assumed.	621	assumed.
467		622
468	Example: load an image, blur it, and clip it to the window size to save	623	Example: load an image, blur it, and clip it to the window size to save
469	memory.	624	memory.
470		625
471	clip blur 10, load "mybg.png"	626	clip keep { blur 10, load "mybg.png" }
472		627
473	=cut	628	=cut
474		629
475	sub clip($;$$;$$) {	630	sub clip($;$$;$$) {
476	my $img = pop;	631	my $img = pop;
…		…
479	$img->sub_rect ($_[0], $_[1], $w, $h)	634	$img->sub_rect ($_[0], $_[1], $w, $h)
480	}	635	}
481		636
482	=item scale $img	637	=item scale $img
483		638
484	=item scale $size_percent, $img	639	=item scale $size_factor, $img
485		640
486	=item scale $width_percent, $height_percent, $img	641	=item scale $width_factor, $height_factor, $img
487		642
488	Scales the image by the given percentages in horizontal	643	Scales the image by the given factors in horizontal
489	(C<$width_percent>) and vertical (C<$height_percent>) direction.	644	(C<$width>) and vertical (C<$height>) direction.
490		645
491	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.
492		647
493	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
494	keeping aspect.	649	keeping aspect.
495		650
496	=item resize $width, $height, $img	651	=item resize $width, $height, $img
497		652
498	Resizes the image to exactly C<$width> times C<$height> pixels.	653	Resizes the image to exactly C<$width> times C<$height> pixels.
499		654
500	=cut	655	=item fit $img
501		656
502	#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, $img
		666
		667	Similar to C<fit>, but shrinks or grows until all of the area is covered
		668	by the image, so instead of potentially leaving borders, it will cut off
		669	image data that doesn't fit.
		670
		671	=cut
503		672
504	sub scale($;$;$) {	673	sub scale($;$;$) {
505	my $img = pop;	674	my $img = pop;
506		675
507	@_ == 2 ? $img->scale ($_[0] * $img->w * 0.01, $_[1] * $img->h * 0.01)	676	@_ == 2 ? $img->scale ($_[0] * $img->w, $_[1] * $img->h)
508	: @_ ? $img->scale ($_[0] * $img->w * 0.01, $_[0] * $img->h * 0.01)	677	: @_ ? $img->scale ($_[0] * $img->w, $_[0] * $img->h)
509	: $img->scale (TW, TH)	678	: $img->scale (TW, TH)
510	}	679	}
511		680
512	sub resize($$$) {	681	sub resize($$$) {
513	my $img = pop;	682	my $img = pop;
514	$img->scale ($_[0], $_[1])	683	$img->scale ($_[0], $_[1])
515	}	684	}
516		685
		686	sub fit($;$$) {
		687	my $img = pop;
		688	my $w = ($_[0] \|\| TW) / $img->w;
		689	my $h = ($_[1] \|\| TH) / $img->h;
		690	scale +(min $w, $h), $img
		691	}
		692
		693	sub cover($;$$) {
		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
517	=item move $dx, $dy, $img	700	=item move $dx, $dy, $img
518		701
519	Moves the image by C<$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
520	the vertical.	703	the vertical.
521		704
522	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.
523		706
524	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" }
525		731
526	=item rootalign $img	732	=item rootalign $img
527		733
528	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
529	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
530	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
531	top left of the screen.	737	top left of the screen.
532		738
533	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.
534		740
535	rootalign mirror load "mybg.png"	741	rootalign keep { mirror load "mybg.png" }
536		742
537	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
538	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.
539		745
540	rootalign root	746	rootalign root
541		747
542	=cut	748	=cut
543		749
544	sub move($$;$) {	750	sub move($$;$) {
545	my $img = pop->clone;	751	my $img = pop->clone;
546	$img->move ($_[0], $_[1]);	752	$img->move ($_[0], $_[1]);
547	$img	753	$img
548	}	754	}
549		755
		756	sub align($;$$) {
		757	my $img = pop;
		758
		759	move $_[0] * (TW - $img->w),
		760	$_[1] * (TH - $img->h),
		761	$img
		762	}
		763
		764	sub center($;$$) {
		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), $img
		770	}
		771
550	sub rootalign($) {	772	sub rootalign($) {
551	move -TX, -TY, $_[0]	773	move -TX, -TY, $_[0]
552	}	774	}
553		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
554	=item contrast $factor, $img	822	=item contrast $factor, $img
555		823
556	=item contrast $r, $g, $b, $img	824	=item contrast $r, $g, $b, $img
557		825
558	=item contrast $r, $g, $b, $a, $img	826	=item contrast $r, $g, $b, $a, $img
559		827
560	Adjusts the I<contrast> of an image.	828	Adjusts the I<contrast> of an image.
561		829
562	#TODO#	830	The first form applies a single C<$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.
563		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
564	=item brightness $factor, $img	841	=item brightness $bias, $img
565		842
566	=item brightness $r, $g, $b, $img	843	=item brightness $r, $g, $b, $img
567		844
568	=item brightness $r, $g, $b, $a, $img	845	=item brightness $r, $g, $b, $a, $img
569		846
570	Adjusts the brightness of an image.	847	Adjusts the brightness of an image.
		848
		849	The first form applies a single C<$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.
571		861
572	=cut	862	=cut
573		863
574	sub contrast($$;$$;$) {	864	sub contrast($$;$$;$) {
575	my $img = pop;	865	my $img = pop;
576	my ($r, $g, $b, $a) = @_;	866	my ($r, $g, $b, $a) = @_;
577		867
578	($g, $b) = ($r, $r) if @_ < 4;	868	($g, $b) = ($r, $r) if @_ < 3;
579	$a = 1 if @_ < 5;	869	$a = 1 if @_ < 4;
580		870
581	$img = $img->clone;	871	$img = $img->clone;
582	$img->contrast ($r, $g, $b, $a);	872	$img->contrast ($r, $g, $b, $a);
583	$img	873	$img
584	}	874	}
585		875
586	sub brightness($$;$$;$) {	876	sub brightness($$;$$;$) {
587	my $img = pop;	877	my $img = pop;
588	my ($r, $g, $b, $a) = @_;	878	my ($r, $g, $b, $a) = @_;
589		879
590	($g, $b) = ($r, $r) if @_ < 4;	880	($g, $b) = ($r, $r) if @_ < 3;
591	$a = 1 if @_ < 5;	881	$a = 1 if @_ < 4;
592		882
593	$img = $img->clone;	883	$img = $img->clone;
594	$img->brightness ($r, $g, $b, $a);	884	$img->brightness ($r, $g, $b, $a);
595	$img	885	$img
		886	}
		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($$$) {
		905	$_[2]->muladd ($_[0], $_[1])
596	}	906	}
597		907
598	=item blur $radius, $img	908	=item blur $radius, $img
599		909
600	=item blur $radius_horz, $radius_vert, $img	910	=item blur $radius_horz, $radius_vert, $img
…		…
612	sub blur($$;$) {	922	sub blur($$;$) {
613	my $img = pop;	923	my $img = pop;
614	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])	924	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
615	}	925	}
616		926
617	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees
618
619	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
620	pointer at C<$center_x> and C<$center_y> (specified as percentage of image
621	width/height), generating a new image with width C<$new_width> and height
622	C<$new_height>.
623
624	#TODO# new width, height, maybe more operators?
625
626	Example: rotate the image by 90 degrees
627
628	=cut
629
630	sub rotate($$$$$$) {
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	927	=back
642		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
643	=cut	1003	=cut
644		1004
645	}	1005	}
646		1006
647	sub parse_expr {	1007	sub parse_expr {
648	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	. "}";
649	die if $@;	1014	die if $@;
650	$expr	1015	$expr
651	}	1016	}
652		1017
653	# compiles a parsed expression	1018	# compiles a parsed expression
654	sub set_expr {	1019	sub set_expr {
655	my ($self, $expr) = @_;	1020	my ($self, $expr) = @_;
656		1021
		1022	$self->{root} = []; # the outermost frame
657	$self->{expr} = $expr;	1023	$self->{expr} = $expr;
658	$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 $state->{rootpmap};
		1072	}
659	}	1073	}
660		1074
661	# evaluate the current bg expression	1075	# evaluate the current bg expression
662	sub recalculate {	1076	sub recalculate {
663	my ($arg_self) = @_;	1077	my ($arg_self) = @_;
…		…
673		1087
674	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;	1088	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;
675		1089
676	# set environment to evaluate user expression	1090	# set environment to evaluate user expression
677		1091
678	local $self = $arg_self;	1092	local $self = $arg_self;
679
680	local $HOME = $ENV{HOME};	1093	local $HOME = $ENV{HOME};
681	local $old = $self->{state};	1094	local $frame = $self->{root};
682	local $new = my $state = $self->{state} = {};
683		1095
684	($x, $y, $w, $h) =
685	$self->background_geometry ($self->{border});	1096	($x, $y, $w, $h) = $self->background_geometry ($self->{border});
686		1097
687	# evaluate user expression	1098	# evaluate user expression
688		1099
689	my $img = eval { $self->{expr}->() };	1100	my @img = eval { $self->{expr}->() };
690	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"
691	die if !UNIVERSAL::isa $img, "urxvt::img";	1104	if grep { !UNIVERSAL::isa $_, "urxvt::img" } @img;
692		1105
693	$state->{size_sensitive} = 1	1106	my $img = urxvt::bgdsl::merge @img;
		1107
		1108	$frame->[FR_AGAIN]{size} = 1
694	if $img->repeat_mode != urxvt::RepeatNormal;	1109	if $img->repeat_mode != urxvt::RepeatNormal;
695		1110
696	# if the expression is sensitive to external events, prepare reevaluation then	1111	# if the expression is sensitive to external events, prepare reevaluation then
697		1112	$self->compile_frame ($frame, sub { $arg_self->recalculate });
698	my $repeat;
699
700	if (my $again = $state->{again}) {
701	$repeat = 1;
702	my $self = $self;
703	$state->{timer} = $again == $old->{again}
704	? $old->{timer}
705	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
706	++$self->{counter};
707	$self->recalculate
708	});
709	}
710
711	if (delete $state->{position_sensitive}) {
712	$repeat = 1;
713	$self->enable (position_change => sub { $_[0]->recalculate });
714	} else {
715	$self->disable ("position_change");
716	}
717
718	if (delete $state->{size_sensitive}) {
719	$repeat = 1;
720	$self->enable (size_change => sub { $_[0]->recalculate });
721	} else {
722	$self->disable ("size_change");
723	}
724
725	if (delete $state->{rootpmap_sensitive}) {
726	$repeat = 1;
727	$self->enable (rootpmap_change => sub { $_[0]->recalculate });
728	} else {
729	$self->disable ("rootpmap_change");
730	}
731		1113
732	# clear stuff we no longer need	1114	# clear stuff we no longer need
733		1115
734	%$old = ();	1116	# unless (%{ $frame->[FR_STATE] }) {
735
736	unless ($repeat) {
737	delete $self->{state};	1117	# delete $self->{state};
738	delete $self->{expr};	1118	# delete $self->{expr};
739	}	1119	# }
740		1120
741	# set background pixmap	1121	# set background pixmap
742		1122
743	$self->set_background ($img, $self->{border});	1123	$self->set_background ($img, $self->{border});
744	$self->scr_recolour (0);	1124	$self->scr_recolour (0);
…		…
746	}	1126	}
747		1127
748	sub on_start {	1128	sub on_start {
749	my ($self) = @_;	1129	my ($self) = @_;
750		1130
751	my $expr = $self->x_resource ("background.expr")	1131	my $expr = $self->x_resource ("%.expr")
752	or return;	1132	or return;
753		1133
		1134	$self->has_render
		1135	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";
		1136
754	$self->set_expr (parse_expr $expr);	1137	$self->set_expr (parse_expr $expr);
755	$self->{border} = $self->x_resource_boolean ("background.border");	1138	$self->{border} = $self->x_resource_boolean ("%.border");
		1139
		1140	$MIN_INTERVAL = $self->x_resource ("%.interval");
756		1141
757	()	1142	()
758	}	1143	}
759		1144

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.41 by root, Fri Jun 8 22:21:48 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 1.41 by root, Fri Jun 8 22:21:48 2012 UTC vs.
Revision 1.79 by root, Tue Sep 4 22:41:11 2012 UTC