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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.39 by root, Fri Jun 8 22:19:03 2012 UTC vs.
Revision 1.82 by sf-exg, Sat Jan 19 10:04:34 2013 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	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,
118	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:
119		151
		152	scale 0.5, 2, keep { load "$HOME/mypic.png" }
		153
		154	The C<keep> operator executes all the statements inside the braces only
		155	once, or when it thinks the outcome might change. In other cases it
		156	returns the last value computed by the brace block.
		157
		158	This means that the C<load> is only executed once, which makes it much
		159	faster, but also means that more memory is being used, because the loaded
		160	image must be kept in memory at all times. In this expression, the
		161	trade-off is likely worth it.
		162
		163	But back to effects: Other effects than scaling are also readily
		164	available, for example, you can tile the image to fill the whole window,
		165	instead of resizing it:
		166
120	tile load "$HOME/mypic.png"	167	tile keep { load "$HOME/mypic.png" }
121		168
122	In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator	169	In fact, images returned by C<load> are in C<tile> mode by default, so the
123	is kind of superfluous.	170	C<tile> operator is kind of superfluous.
124		171
125	Another common effect is to mirror the image, so that the same edges touch:	172	Another common effect is to mirror the image, so that the same edges
		173	touch:
126		174
127	mirror load "$HOME/mypic.png"	175	mirror keep { load "$HOME/mypic.png" }
128		176
129	This is also a typical background expression:	177	Another common background expression is:
130		178
131	rootalign root	179	rootalign root
132		180
133	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
134	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
135	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:
136	moved around.	184	the image seems to be static while the window is moved around.
137		185
138	=head3 CYCLES AND CACHING	186	=head2 COLOUR SPECIFICATIONS
139		187
140	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
141	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:
142	have begun. Many operators cache their results till the next cycle.
143		190
144	For example, the C<load> operator keeps a copy of the image. If it is	191	"red" # named colour
145	asked to load the same image on the next cycle it will not load it again,	192	"#f00" # simple rgb
146	but return the cached copy.	193	"[50]red" # red with 50% alpha
		194	"TekHVC:300/50/50" # anything goes
147		195
148	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:
149	image every time, it will always be cached, but when you load a different
150	image, it will forget about the first one.
151		197
152	This allows you to either speed things up by keeping multiple images in	198	[0.5] # 50% gray, 100% alpha
153	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
154		201
155	For example, you can keep two images in memory and use a random one like	202	=head2 CACHING AND SENSITIVITY
156	this:
157		203
158	my $img1 = load "img1.png";	204	Since some operations (such as C<load> and C<blur>) can take a long time,
159	my $img2 = load "img2.png";	205	caching results can be very important for a smooth operation. Caching can
160	(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.
161		209
162	Since both images are "loaded" every time the expression is evaluated,	210	=head3 C<keep { ... }> caching
163	they are always kept in memory. Contrast this version:
164		211
165	my $path1 = "img1.png";	212	The most important way to cache expensive operations is to use C<keep {
166	my $path2 = "img2.png";	213	... }>. The C<keep> operator takes a block of multiple statements enclosed
167	load ((0.5 > rand) ? $path1 : $path2)	214	by C<{}> and keeps the return value in memory.
168		215
169	Here, a path is selected randomly, and load is only called for one image,	216	An expression can be "sensitive" to various external events, such as
170	so keeps only one image in memory. If, on the next evaluation, luck	217	scaling or moving the window, root background changes and timers. Simply
171	decides to use the other path, then it will have to load that image again.	218	using an expression (such as C<scale> without parameters) that depends on
		219	certain changing values (called "variables"), or using those variables
		220	directly, will make an expression sensitive to these events - for example,
		221	using C<scale> or C<TW> will make the expression sensitive to the terminal
		222	size, and thus to resizing events.
172		223
		224	When such an event happens, C<keep> will automatically trigger a
		225	reevaluation of the whole expression with the new value of the expression.
		226
		227	C<keep> is most useful for expensive operations, such as C<blur>:
		228
		229	rootalign keep { blur 20, root }
		230
		231	This makes a blurred copy of the root background once, and on subsequent
		232	calls, just root-aligns it. Since C<blur> is usually quite slow and
		233	C<rootalign> is quite fast, this trades extra memory (for the cached
		234	blurred pixmap) with speed (blur only needs to be redone when root
		235	changes).
		236
		237	=head3 C<load> caching
		238
		239	The C<load> operator itself does not keep images in memory, but as long as
		240	the image is still in memory, C<load> will use the in-memory image instead
		241	of loading it freshly from disk.
		242
		243	That means that this expression:
		244
		245	keep { load "$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
173	=head2 REFERENCE	250	=head1 REFERENCE
174		251
175	=head3 COMMAND LINE SWITCHES	252	=head2 COMMAND LINE SWITCHES
176		253
177	=over 4	254	=over 4
178		255
179	=item --background-expr perl-expression	256	=item --background-expr perl-expression
180		257
…		…
186	overwriting borders and any other areas, such as the scrollbar.	263	overwriting borders and any other areas, such as the scrollbar.
187		264
188	Specifying this flag changes the behaviour, so that the image only	265	Specifying this flag changes the behaviour, so that the image only
189	replaces the background of the character area.	266	replaces the background of the character area.
190		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
191	=back	277	=back
192		278
193	=cut	279	=cut
194		280
		281	our %_IMG_CACHE;
195	our $HOME;	282	our $HOME;
196	our ($self, $old, $new);	283	our ($self, $frame);
197	our ($x, $y, $w, $h);	284	our ($x, $y, $w, $h);
198		285
199	# enforce at least this interval between updates	286	# enforce at least this interval between updates
200	our $MIN_INTERVAL = 1/100;	287	our $MIN_INTERVAL = 6/59.951;
201		288
202	{	289	{
203	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);
204		298
205	=head2 PROVIDERS/GENERATORS	299	=head2 PROVIDERS/GENERATORS
206		300
207	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
208	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
…		…
213	=item load $path	307	=item load $path
214		308
215	Loads the image at the given C<$path>. The image is set to plane tiling	309	Loads the image at the given C<$path>. The image is set to plane tiling
216	mode.	310	mode.
217		311
218	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.
219		314
		315	=item load_uc $path
		316
		317	Load uncached - same as load, but does not cache the image, which means it
		318	is I<always> loaded from the filesystem again, even if another copy of it
		319	is in memory at the time.
		320
220	=cut	321	=cut
		322
		323	sub load_uc($) {
		324	$self->new_img_from_file ($_[0])
		325	}
221		326
222	sub load($) {	327	sub load($) {
223	my ($path) = @_;	328	my ($path) = @_;
224		329
225	$new->{load}{$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	}
226	}	335	}
227		336
228	=item root	337	=item root
229		338
230	Returns the root window pixmap, that is, hopefully, the background image	339	Returns the root window pixmap, that is, hopefully, the background image
231	of your screen. The image is set to extend mode.	340	of your screen.
232		341
233	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
234	reevaluated when the bg image changes.	343	reevaluated when the bg image changes.
235		344
236	=cut	345	=cut
237		346
238	sub root() {	347	sub root() {
239	$new->{rootpmap_sensitive} = 1;	348	$frame->[FR_AGAIN]{rootpmap} = 1;
240	die "root op not supported, exg, we need you";	349	$self->new_img_from_root
241	}	350	}
242		351
243	=item solid $colour	352	=item solid $colour
244		353
245	=item solid $width, $height, $colour	354	=item solid $width, $height, $colour
246		355
247	Creates a new image and completely fills it with the given colour. The	356	Creates a new image and completely fills it with the given colour. The
248	image is set to tiling mode.	357	image is set to tiling mode.
249		358
250	If <$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
251	useful for solid backgrounds or for use in filtering effects.	360	useful for solid backgrounds or for use in filtering effects.
252		361
253	=cut	362	=cut
254		363
255	sub solid($$;$) {	364	sub solid($;$$) {
256	my $colour = pop;	365	my $colour = pop;
257		366
258	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);
259	$img->fill ($colour);	368	$img->fill ($colour);
260	$img	369	$img
261	}	370	}
262		371
263	=back	372	=item clone $img
264		373
265	=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.
266		376
267	The following functions provide variable data such as the terminal
268	window dimensions. Most of them make your expression sensitive to some
269	events, for example using C<TW> (terminal width) means your expression is
270	evaluated again when the terminal is resized.
271
272	=over 4
273
274	=item TX
275
276	=item TY
277
278	Return the X and Y coordinates of the terminal window (the terminal
279	window is the full window by default, and the character area only when in
280	border-respect mode).
281
282	Using these functions make your expression sensitive to window moves.
283
284	These functions are mainly useful to align images to the root window.
285
286	Example: load an image and align it so it looks as if anchored to the
287	background.
288
289	move -TX, -TY, load "mybg.png"
290
291	=item TW
292
293	Return the width (C<TW>) and height (C<TH>) of the terminal window (the
294	terminal window is the full window by default, and the character area only
295	when in border-respect mode).
296
297	Using these functions make your expression sensitive to window resizes.
298
299	These functions are mainly useful to scale images, or to clip images to
300	the window size to conserve memory.
301
302	Example: take the screen background, clip it to the window size, blur it a
303	bit, align it to the window position and use it as background.
304
305	clip move -TX, -TY, blur 5, root
306
307	=cut	377	=cut
308		378
309	sub TX() { $new->{position_sensitive} = 1; $x }
310	sub TY() { $new->{position_sensitive} = 1; $y }
311	sub TW() { $new->{size_sensitive} = 1; $w }
312	sub TH() { $new->{size_sensitive} = 1; $h }
313
314	=item now
315
316	Returns the current time as (fractional) seconds since the epoch.
317
318	Using this expression does I<not> make your expression sensitive to time,
319	but the next two functions do.
320
321	=item again $seconds
322
323	When this function is used the expression will be reevaluated again in
324	C<$seconds> seconds.
325
326	Example: load some image and rotate it according to the time of day (as if it were
327	the hour pointer of a clock). Update this image every minute.
328
329	again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"
330
331	=item counter $seconds
332
333	Like C<again>, but also returns an increasing counter value, starting at
334	0, which might be useful for some simple animation effects.
335
336	=cut
337
338	sub now() { urxvt::NOW }
339
340	sub again($) {
341	$new->{again} = $_[0];
342	}
343
344	sub counter($) {	379	sub clone($) {
345	$new->{again} = $_[0];	380	$_[0]->clone
346	$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
347	}	425	}
348		426
349	=back	427	=back
350		428
351	=head2 TILING MODES	429	=head2 TILING MODES
…		…
384	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
385	image over another image or the background colour while leaving all	463	image over another image or the background colour while leaving all
386	background pixels outside the image unchanged.	464	background pixels outside the image unchanged.
387		465
388	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
389	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
390	in alpha mode, else background colour).	468	in alpha mode, else background colour).
391		469
392	pad load "mybg.png"	470	pad load "mybg.png"
393		471
394	=item extend $img	472	=item extend $img
395		473
396	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
397	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
398	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
399	same values as the pixels near the edge.	477	same values as the pixels near the edge.
400		478
401	Example: just for curiosity, how does this pixel extension stuff work?	479	Example: just for curiosity, how does this pixel extension stuff work?
402		480
…		…
428	$img	506	$img
429	}	507	}
430		508
431	=back	509	=back
432		510
433	=head2 PIXEL OPERATORS	511	=head2 VARIABLE VALUES
434		512
435	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.
436		518
437	=over 4	519	=over 4
438		520
439	=item clone $img	521	=item TX
440		522
441	Returns an exact copy of the image.	523	=item TY
442		524
443	=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).
444		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} = $_[0];
		592	}
		593
445	sub clone($) {	594	sub counter($) {
446	$_[0]->clone	595	$frame->[FR_AGAIN]{time} = $_[0];
		596	$frame->[FR_STATE]{counter} + 0
447	}	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
448		606
449	=item clip $img	607	=item clip $img
450		608
451	=item clip $width, $height, $img	609	=item clip $width, $height, $img
452		610
…		…
455	Clips an image to the given rectangle. If the rectangle is outside the	613	Clips an image to the given rectangle. If the rectangle is outside the
456	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is	614	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is
457	larger than the image, then the tiling mode defines how the extra pixels	615	larger than the image, then the tiling mode defines how the extra pixels
458	will be filled.	616	will be filled.
459		617
460	If C<$x> an C<$y> are missing, then C<0> is assumed for both.	618	If C<$x> and C<$y> are missing, then C<0> is assumed for both.
461		619
462	If C<$width> and C<$height> are missing, then the window size will be	620	If C<$width> and C<$height> are missing, then the window size will be
463	assumed.	621	assumed.
464		622
465	Example: load an image, blur it, and clip it to the window size to save	623	Example: load an image, blur it, and clip it to the window size to save
466	memory.	624	memory.
467		625
468	clip blur 10, load "mybg.png"	626	clip keep { blur 10, load "mybg.png" }
469		627
470	=cut	628	=cut
471		629
472	sub clip($;$$;$$) {	630	sub clip($;$$;$$) {
473	my $img = pop;	631	my $img = pop;
…		…
476	$img->sub_rect ($_[0], $_[1], $w, $h)	634	$img->sub_rect ($_[0], $_[1], $w, $h)
477	}	635	}
478		636
479	=item scale $img	637	=item scale $img
480		638
481	=item scale $size_percent, $img	639	=item scale $size_factor, $img
482		640
483	=item scale $width_percent, $height_percent, $img	641	=item scale $width_factor, $height_factor, $img
484		642
485	Scales the image by the given percentages in horizontal	643	Scales the image by the given factors in horizontal
486	(C<$width_percent>) and vertical (C<$height_percent>) direction.	644	(C<$width>) and vertical (C<$height>) direction.
487		645
488	If only one percentage is give, it is used for both directions.	646	If only one factor is given, it is used for both directions.
489		647
490	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
491	keeping aspect.	649	keeping aspect.
492		650
493	=item resize $width, $height, $img	651	=item resize $width, $height, $img
494		652
495	Resizes the image to exactly C<$width> times C<$height> pixels.	653	Resizes the image to exactly C<$width> times C<$height> pixels.
496		654
497	=cut	655	=item fit $img
498		656
499	#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, $img
		666
		667	Similar to C<fit>, but shrinks or grows until all of the area is covered
		668	by the image, so instead of potentially leaving borders, it will cut off
		669	image data that doesn't fit.
		670
		671	=cut
500		672
501	sub scale($;$;$) {	673	sub scale($;$;$) {
502	my $img = pop;	674	my $img = pop;
503		675
504	@_ == 2 ? $img->scale ($_[0] * $img->w * 0.01, $_[1] * $img->h * 0.01)	676	@_ == 2 ? $img->scale ($_[0] * $img->w, $_[1] * $img->h)
505	: @_ ? $img->scale ($_[0] * $img->w * 0.01, $_[0] * $img->h * 0.01)	677	: @_ ? $img->scale ($_[0] * $img->w, $_[0] * $img->h)
506	: $img->scale (TW, TH)	678	: $img->scale (TW, TH)
507	}	679	}
508		680
509	sub resize($$$) {	681	sub resize($$$) {
510	my $img = pop;	682	my $img = pop;
511	$img->scale ($_[0], $_[1])	683	$img->scale ($_[0], $_[1])
512	}	684	}
513		685
		686	sub fit($;$$) {
		687	my $img = pop;
		688	my $w = ($_[0] \|\| TW) / $img->w;
		689	my $h = ($_[1] \|\| TH) / $img->h;
		690	scale +(min $w, $h), $img
		691	}
		692
		693	sub cover($;$$) {
		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
514	=item move $dx, $dy, $img	700	=item move $dx, $dy, $img
515		701
516	Moves the image by C<$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
517	the vertical.	703	the vertical.
518		704
519	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.
520		706
521	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" }
522		731
523	=item rootalign $img	732	=item rootalign $img
524		733
525	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
526	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
527	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
528	top left of the screen.	737	top left of the screen.
529		738
530	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.
531		740
532	rootalign mirror load "mybg.png"	741	rootalign keep { mirror load "mybg.png" }
533		742
534	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
535	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.
536		745
537	rootalign root	746	rootalign root
538		747
539	=cut	748	=cut
540		749
541	sub move($$;$) {	750	sub move($$;$) {
542	my $img = pop->clone;	751	my $img = pop->clone;
543	$img->move ($_[0], $_[1]);	752	$img->move ($_[0], $_[1]);
544	$img	753	$img
545	}	754	}
546		755
		756	sub align($;$$) {
		757	my $img = pop;
		758
		759	move $_[0] * (TW - $img->w),
		760	$_[1] * (TH - $img->h),
		761	$img
		762	}
		763
		764	sub center($;$$) {
		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), $img
		770	}
		771
547	sub rootalign($) {	772	sub rootalign($) {
548	move -TX, -TY, $_[0]	773	move -TX, -TY, $_[0]
549	}	774	}
550		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 its 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
		822	=item shade $factor, $img
		823
		824	Shade the image by the given factor.
		825
		826	=cut
		827
		828	sub shade($$) {
		829	$_[1]->shade ($_[0])
		830	}
		831
551	=item contrast $factor, $img	832	=item contrast $factor, $img
552		833
553	=item contrast $r, $g, $b, $img	834	=item contrast $r, $g, $b, $img
554		835
555	=item contrast $r, $g, $b, $a, $img	836	=item contrast $r, $g, $b, $a, $img
556		837
557	Adjusts the I<contrast> of an image.	838	Adjusts the I<contrast> of an image.
558		839
559	#TODO#	840	The first form applies a single C<$factor> to red, green and blue, the
		841	second form applies separate factors to each colour channel, and the last
		842	form includes the alpha channel.
560		843
		844	Values from 0 to 1 lower the contrast, values higher than 1 increase the
		845	contrast.
		846
		847	Due to limitations in the underlying XRender extension, lowering contrast
		848	also reduces brightness, while increasing contrast currently also
		849	increases brightness.
		850
561	=item brightness $factor, $img	851	=item brightness $bias, $img
562		852
563	=item brightness $r, $g, $b, $img	853	=item brightness $r, $g, $b, $img
564		854
565	=item brightness $r, $g, $b, $a, $img	855	=item brightness $r, $g, $b, $a, $img
566		856
567	Adjusts the brightness of an image.	857	Adjusts the brightness of an image.
		858
		859	The first form applies a single C<$bias> to red, green and blue, the
		860	second form applies separate biases to each colour channel, and the last
		861	form includes the alpha channel.
		862
		863	Values less than 0 reduce brightness, while values larger than 0 increase
		864	it. Useful range is from -1 to 1 - the former results in a black, the
		865	latter in a white picture.
		866
		867	Due to idiosyncrasies in the underlying XRender extension, biases less
		868	than zero can be I<very> slow.
		869
		870	You can also try the experimental(!) C<muladd> operator.
568		871
569	=cut	872	=cut
570		873
571	sub contrast($$;$$;$) {	874	sub contrast($$;$$;$) {
572	my $img = pop;	875	my $img = pop;
573	my ($r, $g, $b, $a) = @_;	876	my ($r, $g, $b, $a) = @_;
574		877
575	($g, $b) = ($r, $r) if @_ < 4;	878	($g, $b) = ($r, $r) if @_ < 3;
576	$a = 1 if @_ < 5;	879	$a = 1 if @_ < 4;
577		880
578	$img = $img->clone;	881	$img = $img->clone;
579	$img->contrast ($r, $g, $b, $a);	882	$img->contrast ($r, $g, $b, $a);
580	$img	883	$img
581	}	884	}
582		885
583	sub brightness($$;$$;$) {	886	sub brightness($$;$$;$) {
584	my $img = pop;	887	my $img = pop;
585	my ($r, $g, $b, $a) = @_;	888	my ($r, $g, $b, $a) = @_;
586		889
587	($g, $b) = ($r, $r) if @_ < 4;	890	($g, $b) = ($r, $r) if @_ < 3;
588	$a = 1 if @_ < 5;	891	$a = 1 if @_ < 4;
589		892
590	$img = $img->clone;	893	$img = $img->clone;
591	$img->brightness ($r, $g, $b, $a);	894	$img->brightness ($r, $g, $b, $a);
592	$img	895	$img
		896	}
		897
		898	=item muladd $mul, $add, $img # EXPERIMENTAL
		899
		900	First multiplies the pixels by C<$mul>, then adds C<$add>. This can be used
		901	to implement brightness and contrast at the same time, with a wider value
		902	range than contrast and brightness operators.
		903
		904	Due to numerous bugs in XRender implementations, it can also introduce a
		905	number of visual artifacts.
		906
		907	Example: increase contrast by a factor of C<$c> without changing image
		908	brightness too much.
		909
		910	muladd $c, (1 - $c) * 0.5, $img
		911
		912	=cut
		913
		914	sub muladd($$$) {
		915	$_[2]->muladd ($_[0], $_[1])
593	}	916	}
594		917
595	=item blur $radius, $img	918	=item blur $radius, $img
596		919
597	=item blur $radius_horz, $radius_vert, $img	920	=item blur $radius_horz, $radius_vert, $img
…		…
609	sub blur($$;$) {	932	sub blur($$;$) {
610	my $img = pop;	933	my $img = pop;
611	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])	934	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
612	}	935	}
613		936
614	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees
615
616	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
617	pointer at C<$center_x> and C<$center_y> (specified as percentage of image
618	width/height), generating a new image with width C<$new_width> and height
619	C<$new_height>.
620
621	#TODO# new width, height, maybe more operators?
622
623	Example: rotate the image by 90 degrees
624
625	=cut
626
627	sub rotate($$$$$$) {
628	my $img = pop;
629	$img->rotate (
630	$_[0],
631	$_[1],
632	$_[2] * $img->w * .01,
633	$_[3] * $img->h * .01,
634	$_[4] * (3.14159265 / 180),
635	)
636	}
637
638	=back	937	=back
639		938
		939	=head2 OTHER STUFF
		940
		941	Anything that didn't fit any of the other categories, even after applying
		942	force and closing our eyes.
		943
		944	=over 4
		945
		946	=item keep { ... }
		947
		948	This operator takes a code block as argument, that is, one or more
		949	statements enclosed by braces.
		950
		951	The trick is that this code block is only evaluated when the outcome
		952	changes - on other calls the C<keep> simply returns the image it computed
		953	previously (yes, it should only be used with images). Or in other words,
		954	C<keep> I<caches> the result of the code block so it doesn't need to be
		955	computed again.
		956
		957	This can be extremely useful to avoid redoing slow operations - for
		958	example, if your background expression takes the root background, blurs it
		959	and then root-aligns it it would have to blur the root background on every
		960	window move or resize.
		961
		962	Another example is C<load>, which can be quite slow.
		963
		964	In fact, urxvt itself encloses the whole expression in some kind of
		965	C<keep> block so it only is reevaluated as required.
		966
		967	Putting the blur into a C<keep> block will make sure the blur is only done
		968	once, while the C<rootalign> is still done each time the window moves.
		969
		970	rootalign keep { blur 10, root }
		971
		972	This leaves the question of how to force reevaluation of the block,
		973	in case the root background changes: If expression inside the block
		974	is sensitive to some event (root background changes, window geometry
		975	changes), then it will be reevaluated automatically as needed.
		976
		977	=cut
		978
		979	sub keep(&) {
		980	my $id = $_[0]+0;
		981
		982	local $frame = $self->{frame_cache}{$id} \|\|= [$frame];
		983
		984	unless ($frame->[FR_CACHE]) {
		985	$frame->[FR_CACHE] = [ $_[0]() ];
		986
		987	my $self = $self;
		988	my $frame = $frame;
		989	Scalar::Util::weaken $frame;
		990	$self->compile_frame ($frame, sub {
		991	# clear this frame cache, also for all parents
		992	for (my $frame = $frame; $frame; $frame = $frame->[0]) {
		993	undef $frame->[FR_CACHE];
		994	}
		995
		996	$self->recalculate;
		997	});
		998	};
		999
		1000	# in scalar context we always return the first original result, which
		1001	# is not quite how perl works.
		1002	wantarray
		1003	? @{ $frame->[FR_CACHE] }
		1004	: $frame->[FR_CACHE][0]
		1005	}
		1006
		1007	# sub keep_clear() {
		1008	# delete $self->{frame_cache};
		1009	# }
		1010
		1011	=back
		1012
640	=cut	1013	=cut
641		1014
642	}	1015	}
643		1016
644	sub parse_expr {	1017	sub parse_expr {
645	my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}";	1018	my $expr = eval
		1019	"sub {\n"
		1020	. "package urxvt::bgdsl;\n"
		1021	. "#line 0 'background expression'\n"
		1022	. "$_[0]\n"
		1023	. "}";
646	die if $@;	1024	die if $@;
647	$expr	1025	$expr
648	}	1026	}
649		1027
650	# compiles a parsed expression	1028	# compiles a parsed expression
651	sub set_expr {	1029	sub set_expr {
652	my ($self, $expr) = @_;	1030	my ($self, $expr) = @_;
653		1031
		1032	$self->{root} = []; # the outermost frame
654	$self->{expr} = $expr;	1033	$self->{expr} = $expr;
655	$self->recalculate;	1034	$self->recalculate;
		1035	}
		1036
		1037	# takes a hash of sensitivity indicators and installs watchers
		1038	sub compile_frame {
		1039	my ($self, $frame, $cb) = @_;
		1040
		1041	my $state = $frame->[urxvt::bgdsl::FR_STATE] \|\|= {};
		1042	my $again = $frame->[urxvt::bgdsl::FR_AGAIN];
		1043
		1044	# don't keep stuff alive
		1045	Scalar::Util::weaken $state;
		1046
		1047	if ($again->{nested}) {
		1048	$state->{nested} = 1;
		1049	} else {
		1050	delete $state->{nested};
		1051	}
		1052
		1053	if (my $interval = $again->{time}) {
		1054	$state->{time} = [$interval, urxvt::timer->new->after ($interval)->interval ($interval)]
		1055	if $state->{time}[0] != $interval;
		1056
		1057	# callback might have changed, although we could just rule that out
		1058	$state->{time}[1]->cb (sub {
		1059	++$state->{counter};
		1060	$cb->();
		1061	});
		1062	} else {
		1063	delete $state->{time};
		1064	}
		1065
		1066	if ($again->{position}) {
		1067	$state->{position} = $self->on (position_change => $cb);
		1068	} else {
		1069	delete $state->{position};
		1070	}
		1071
		1072	if ($again->{size}) {
		1073	$state->{size} = $self->on (size_change => $cb);
		1074	} else {
		1075	delete $state->{size};
		1076	}
		1077
		1078	if ($again->{rootpmap}) {
		1079	$state->{rootpmap} = $self->on (rootpmap_change => $cb);
		1080	} else {
		1081	delete $state->{rootpmap};
		1082	}
656	}	1083	}
657		1084
658	# evaluate the current bg expression	1085	# evaluate the current bg expression
659	sub recalculate {	1086	sub recalculate {
660	my ($arg_self) = @_;	1087	my ($arg_self) = @_;
…		…
670		1097
671	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;	1098	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;
672		1099
673	# set environment to evaluate user expression	1100	# set environment to evaluate user expression
674		1101
675	local $self = $arg_self;	1102	local $self = $arg_self;
676
677	local $HOME = $ENV{HOME};	1103	local $HOME = $ENV{HOME};
678	local $old = $self->{state};	1104	local $frame = $self->{root};
679	local $new = my $state = $self->{state} = {};
680		1105
681	($x, $y, $w, $h) =
682	$self->background_geometry ($self->{border});	1106	($x, $y, $w, $h) = $self->background_geometry ($self->{border});
683		1107
684	# evaluate user expression	1108	# evaluate user expression
685		1109
686	my $img = eval { $self->{expr}->() };	1110	my @img = eval { $self->{expr}->() };
687	warn $@ if $@;#d#	1111	die $@ if $@;
		1112	die "background-expr did not return anything.\n" unless @img;
		1113	die "background-expr: expected image(s), got something else.\n"
688	die if !UNIVERSAL::isa $img, "urxvt::img";	1114	if grep { !UNIVERSAL::isa $_, "urxvt::img" } @img;
689		1115
690	$state->{size_sensitive} = 1	1116	my $img = urxvt::bgdsl::merge @img;
		1117
		1118	$frame->[FR_AGAIN]{size} = 1
691	if $img->repeat_mode != urxvt::RepeatNormal;	1119	if $img->repeat_mode != urxvt::RepeatNormal;
692		1120
693	# if the expression is sensitive to external events, prepare reevaluation then	1121	# if the expression is sensitive to external events, prepare reevaluation then
694		1122	$self->compile_frame ($frame, sub { $arg_self->recalculate });
695	my $repeat;
696
697	if (my $again = $state->{again}) {
698	$repeat = 1;
699	my $self = $self;
700	$state->{timer} = $again == $old->{again}
701	? $old->{timer}
702	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
703	++$self->{counter};
704	$self->recalculate
705	});
706	}
707
708	if (delete $state->{position_sensitive}) {
709	$repeat = 1;
710	$self->enable (position_change => sub { $_[0]->recalculate });
711	} else {
712	$self->disable ("position_change");
713	}
714
715	if (delete $state->{size_sensitive}) {
716	$repeat = 1;
717	$self->enable (size_change => sub { $_[0]->recalculate });
718	} else {
719	$self->disable ("size_change");
720	}
721
722	if (delete $state->{rootpmap_sensitive}) {
723	$repeat = 1;
724	$self->enable (rootpmap_change => sub { $_[0]->recalculate });
725	} else {
726	$self->disable ("rootpmap_change");
727	}
728		1123
729	# clear stuff we no longer need	1124	# clear stuff we no longer need
730		1125
731	%$old = ();	1126	# unless (%{ $frame->[FR_STATE] }) {
732
733	unless ($repeat) {
734	delete $self->{state};	1127	# delete $self->{state};
735	delete $self->{expr};	1128	# delete $self->{expr};
736	}	1129	# }
737		1130
738	# set background pixmap	1131	# set background pixmap
739		1132
740	$self->set_background ($img, $self->{border});	1133	$self->set_background ($img, $self->{border});
741	$self->scr_recolour (0);	1134	$self->scr_recolour (0);
…		…
743	}	1136	}
744		1137
745	sub on_start {	1138	sub on_start {
746	my ($self) = @_;	1139	my ($self) = @_;
747		1140
748	my $expr = $self->x_resource ("background.expr")	1141	my $expr = $self->x_resource ("%.expr")
749	or return;	1142	or return;
750		1143
		1144	$self->has_render
		1145	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";
		1146
751	$self->set_expr (parse_expr $expr);	1147	$self->set_expr (parse_expr $expr);
752	$self->{border} = $self->x_resource_boolean ("background.border");	1148	$self->{border} = $self->x_resource_boolean ("%.border");
		1149
		1150	$MIN_INTERVAL = $self->x_resource ("%.interval");
753		1151
754	()	1152	()
755	}	1153	}
756		1154

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.39 by root, Fri Jun 8 22:19:03 2012 UTC vs. Revision 1.82 by sf-exg, Sat Jan 19 10:04:34 2013 UTC

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Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.39 by root, Fri Jun 8 22:19:03 2012 UTC vs.
Revision 1.82 by sf-exg, Sat Jan 19 10:04:34 2013 UTC