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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.63 by root, Tue Jun 19 18:17:56 2012 UTC vs.
Revision 1.92 by sf-exg, Thu Jul 14 05:33:26 2016 UTC

…		…
1	#! perl	1	#! perl
2		2
3	#:META:X_RESOURCE:%.expr:string:background expression	3	#:META:RESOURCE:%.expr:string:background expression
4	#:META:X_RESOURCE:%.border:boolean:respect the terminal border	4	#:META:RESOURCE:%.border:boolean:respect the terminal border
5	#:META:X_RESOURCE:%.interval:seconds:minimum time between updates	5	#:META:RESOURCE:%.interval:seconds:minimum time between updates
		6	#:META:RESOURCE:pixmap:file[;geom]:set image as background
		7	#:META:RESOURCE:backgroundPixmap:file[;geom]:set image as background
		8	#:META:RESOURCE:tr:boolean:set root pixmap as background
		9	#:META:RESOURCE:transparent:boolean:set root pixmap as background
		10	#:META:RESOURCE:tint:color:tint background with color
		11	#:META:RESOURCE:tintColor:color:tint background with color
		12	#:META:RESOURCE:sh:number:shade background by number %
		13	#:META:RESOURCE:shading:number:shade background by number %
		14	#:META:RESOURCE:blr:HxV:gaussian-blur background with radii
		15	#:META:RESOURCE:blurRadius:HxV:gaussian-blur background with radii
6		16
7	=head1 NAME	17	=head1 NAME
8		18
9	background - manage terminal background	19	background - manage terminal background
10		20
11	=head1 SYNOPSIS	21	=head1 SYNOPSIS
12		22
13	urxvt --background-expr 'background expression'	23	urxvt --background-expr 'background expression'
14	--background-border	24	--background-border
15	--background-interval seconds	25	--background-interval seconds
16		26
		27	=head1 QUICK AND DIRTY CHEAT SHEET
		28
		29	Just load a random jpeg image and tile the background with it without
		30	scaling or anything else:
		31
		32	load "/path/to/img.jpg"
		33
		34	The same, but use mirroring/reflection instead of tiling:
		35
		36	mirror load "/path/to/img.jpg"
		37
		38	Load an image and scale it to exactly fill the terminal window:
		39
		40	scale keep { load "/path/to/img.jpg" }
		41
		42	Implement pseudo-transparency by using a suitably-aligned root pixmap
		43	as window background:
		44
		45	rootalign root
		46
		47	Likewise, but keep a blurred copy:
		48
		49	rootalign keep { blur 10, root }
		50
17	=head1 DESCRIPTION	51	=head1 DESCRIPTION
18		52
19	This extension manages the terminal background by creating a picture that	53	This extension manages the terminal background by creating a picture that
20	is behind the text, replacing the normal background colour.	54	is behind the text, replacing the normal background colour.
21		55
26	to be as simple as possible.	60	to be as simple as possible.
27		61
28	For example, to load an image and scale it to the window size, you would	62	For example, to load an image and scale it to the window size, you would
29	use:	63	use:
30		64
31	urxvt --background-expr 'scale load "/path/to/mybg.png"'	65	urxvt --background-expr 'scale keep { load "/path/to/mybg.png" }'
32		66
33	Or specified as a X resource:	67	Or specified as a X resource:
34		68
35	URxvt.background-expr: scale load "/path/to/mybg.png"	69	URxvt.background.expr: scale keep { load "/path/to/mybg.png" }
36		70
37	=head1 THEORY OF OPERATION	71	=head1 THEORY OF OPERATION
38		72
39	At startup, just before the window is mapped for the first time, the	73	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	74	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	87	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	88	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	89	pixmap is replaced by another one the root background changes; or when the
56	timer elapses), then the expression will be evaluated again.	90	timer elapses), then the expression will be evaluated again.
57		91
58	For example, an expression such as C<scale load "$HOME/mybg.png"> scales the	92	For example, an expression such as C<scale keep { load "$HOME/mybg.png"
59	image to the window size, so it relies on the window size and will	93	}> 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	94	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	95	example. That ensures that the picture always fills the terminal, even
62	after its size changes.	96	after its size changes.
63		97
64	=head2 EXPRESSIONS	98	=head2 EXPRESSIONS
65		99
66	Expressions are normal Perl expressions, in fact, they are Perl blocks -	100	Expressions are normal Perl expressions, in fact, they are Perl blocks -
67	which means you could use multiple lines and statements:	101	which means you could use multiple lines and statements:
68		102
		103	scale keep {
69	again 3600;	104	again 3600;
70	if (localtime now)[6]) {	105	if (localtime now)[6]) {
71	return scale load "$HOME/weekday.png";	106	return load "$HOME/weekday.png";
72	} else {	107	} else {
73	return scale load "$HOME/sunday.png";	108	return load "$HOME/sunday.png";
		109	}
74	}	110	}
75		111
76	This expression is evaluated once per hour. It will set F<sunday.png> as	112	This inner expression is evaluated once per hour (and whenever the
		113	terminal window is resized). It sets F<sunday.png> as background on
77	background on Sundays, and F<weekday.png> on all other days.	114	Sundays, and F<weekday.png> on all other days.
78		115
79	Fortunately, we expect that most expressions will be much simpler, with	116	Fortunately, we expect that most expressions will be much simpler, with
80	little Perl knowledge needed.	117	little Perl knowledge needed.
81		118
82	Basically, you always start with a function that "generates" an image	119	Basically, you always start with a function that "generates" an image
…		…
105	get a percentage):	142	get a percentage):
106		143
107	scale 2, load "$HOME/mypic.png"	144	scale 2, load "$HOME/mypic.png"
108		145
109	This enlarges the image by a factor of 2 (200%). As you can see, C<scale>	146	This enlarges the image by a factor of 2 (200%). As you can see, C<scale>
110	has now two arguments, the C<200> and the C<load> expression, while	147	has now two arguments, the C<2> and the C<load> expression, while
111	C<load> only has one argument. Arguments are separated from each other by	148	C<load> only has one argument. Arguments are separated from each other by
112	commas.	149	commas.
113		150
114	Scale also accepts two arguments, which are then separate factors for both	151	Scale also accepts two arguments, which are then separate factors for both
115	horizontal and vertical dimensions. For example, this halves the image	152	horizontal and vertical dimensions. For example, this halves the image
116	width and doubles the image height:	153	width and doubles the image height:
117		154
118	scale 0.5, 2, load "$HOME/mypic.png"	155	scale 0.5, 2, load "$HOME/mypic.png"
119		156
120	Other effects than scaling are also readily available, for example, you can	157	IF you try out these expressions, you might suffer from some sluggishness,
121	tile the image to fill the whole window, instead of resizing it:	158	because each time the terminal is resized, it loads the PNG image again
		159	and scales it. Scaling is usually fast (and unavoidable), but loading the
		160	image can be quite time consuming. This is where C<keep> comes in handy:
122		161
		162	scale 0.5, 2, keep { load "$HOME/mypic.png" }
		163
		164	The C<keep> operator executes all the statements inside the braces only
		165	once, or when it thinks the outcome might change. In other cases it
		166	returns the last value computed by the brace block.
		167
		168	This means that the C<load> is only executed once, which makes it much
		169	faster, but also means that more memory is being used, because the loaded
		170	image must be kept in memory at all times. In this expression, the
		171	trade-off is likely worth it.
		172
		173	But back to effects: Other effects than scaling are also readily
		174	available, for example, you can tile the image to fill the whole window,
		175	instead of resizing it:
		176
123	tile load "$HOME/mypic.png"	177	tile keep { load "$HOME/mypic.png" }
124		178
125	In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator	179	In fact, images returned by C<load> are in C<tile> mode by default, so the
126	is kind of superfluous.	180	C<tile> operator is kind of superfluous.
127		181
128	Another common effect is to mirror the image, so that the same edges touch:	182	Another common effect is to mirror the image, so that the same edges
		183	touch:
129		184
130	mirror load "$HOME/mypic.png"	185	mirror keep { load "$HOME/mypic.png" }
131		186
132	This is also a typical background expression:	187	Another common background expression is:
133		188
134	rootalign root	189	rootalign root
135		190
136	It first takes a snapshot of the screen background image, and then	191	This one first takes a snapshot of the screen background image, and then
137	moves it to the upper left corner of the screen - the result is	192	moves it to the upper left corner of the screen (as opposed to the upper
138	pseudo-transparency, as the image seems to be static while the window is	193	left corner of the terminal window)- the result is pseudo-transparency:
139	moved around.	194	the image seems to be static while the window is moved around.
140		195
141	=head2 CYCLES AND CACHING	196	=head2 COLOUR SPECIFICATIONS
142		197
143	=head3 C<load> et al.	198	Whenever an operator expects a "colour", then this can be specified in one
		199	of two ways: Either as string with an X11 colour specification, such as:
144		200
145	As has been mentioned before, the expression might be evaluated multiple	201	"red" # named colour
146	times. Each time the expression is reevaluated, a new cycle is said to	202	"#f00" # simple rgb
147	have begun. Many operators cache their results till the next cycle.	203	"[50]red" # red with 50% alpha
		204	"TekHVC:300/50/50" # anything goes
148		205
149	For example, the C<load> operator keeps a copy of the image. If it is	206	OR as an array reference with one, three or four components:
150	asked to load the same image on the next cycle it will not load it again,
151	but return the cached copy.
152		207
153	This only works for one cycle though, so as long as you load the same	208	[0.5] # 50% gray, 100% alpha
154	image every time, it will always be cached, but when you load a different	209	[0.5, 0, 0] # dark red, no green or blur, 100% alpha
155	image, it will forget about the first one.	210	[0.5, 0, 0, 0.7] # same with explicit 70% alpha
156		211
157	This allows you to either speed things up by keeping multiple images in	212	=head2 CACHING AND SENSITIVITY
158	memory, or conserve memory by loading images more often.
159		213
160	For example, you can keep two images in memory and use a random one like	214	Since some operations (such as C<load> and C<blur>) can take a long time,
161	this:	215	caching results can be very important for a smooth operation. Caching can
		216	also be useful to reduce memory usage, though, for example, when an image
		217	is cached by C<load>, it could be shared by multiple terminal windows
		218	running inside urxvtd.
162		219
163	my $img1 = load "img1.png";	220	=head3 C<keep { ... }> caching
164	my $img2 = load "img2.png";
165	(0.5 > rand) ? $img1 : $img2
166		221
167	Since both images are "loaded" every time the expression is evaluated,	222	The most important way to cache expensive operations is to use C<keep {
168	they are always kept in memory. Contrast this version:
169
170	my $path1 = "img1.png";
171	my $path2 = "img2.png";
172	load ((0.5 > rand) ? $path1 : $path2)
173
174	Here, a path is selected randomly, and load is only called for one image,
175	so keeps only one image in memory. If, on the next evaluation, luck
176	decides to use the other path, then it will have to load that image again.
177
178	=head3 C<once { ... }>
179
180	Another way to cache expensive operations is to use C<once { ... }>. The
181	C<once> operator takes a block of multiple statements enclosed by C<{}>	223	... }>. The C<keep> operator takes a block of multiple statements enclosed
182	and evaluates it only.. once, returning any images the last statement	224	by C<{}> and keeps the return value in memory.
183	returned. Further calls simply produce the values from the cache.
184		225
		226	An expression can be "sensitive" to various external events, such as
		227	scaling or moving the window, root background changes and timers. Simply
		228	using an expression (such as C<scale> without parameters) that depends on
		229	certain changing values (called "variables"), or using those variables
		230	directly, will make an expression sensitive to these events - for example,
		231	using C<scale> or C<TW> will make the expression sensitive to the terminal
		232	size, and thus to resizing events.
		233
		234	When such an event happens, C<keep> will automatically trigger a
		235	reevaluation of the whole expression with the new value of the expression.
		236
185	This is most useful for expensive operations, such as C<blur>:	237	C<keep> is most useful for expensive operations, such as C<blur>:
186		238
187	rootalign once { blur 20, root }	239	rootalign keep { blur 20, root }
188		240
189	This makes a blurred copy of the root background once, and on subsequent	241	This makes a blurred copy of the root background once, and on subsequent
190	calls, just root-aligns it. Since C<blur> is usually quite slow and	242	calls, just root-aligns it. Since C<blur> is usually quite slow and
191	C<rootalign> is quite fast, this trades extra memory (For the cached	243	C<rootalign> is quite fast, this trades extra memory (for the cached
192	blurred pixmap) with speed (blur only needs to be redone when root	244	blurred pixmap) with speed (blur only needs to be redone when root
193	changes).	245	changes).
		246
		247	=head3 C<load> caching
		248
		249	The C<load> operator itself does not keep images in memory, but as long as
		250	the image is still in memory, C<load> will use the in-memory image instead
		251	of loading it freshly from disk.
		252
		253	That means that this expression:
		254
		255	keep { load "$HOME/path..." }
		256
		257	Not only caches the image in memory, other terminal instances that try to
		258	C<load> it can reuse that in-memory copy.
194		259
195	=head1 REFERENCE	260	=head1 REFERENCE
196		261
197	=head2 COMMAND LINE SWITCHES	262	=head2 COMMAND LINE SWITCHES
198		263
…		…
224	=cut	289	=cut
225		290
226	our %_IMG_CACHE;	291	our %_IMG_CACHE;
227	our $HOME;	292	our $HOME;
228	our ($self, $frame);	293	our ($self, $frame);
229	our ($x, $y, $w, $h);	294	our ($x, $y, $w, $h, $focus);
230		295
231	# enforce at least this interval between updates	296	# enforce at least this interval between updates
232	our $MIN_INTERVAL = 6/59.951;	297	our $MIN_INTERVAL = 6/59.951;
233		298
234	{	299	{
…		…
252	=item load $path	317	=item load $path
253		318
254	Loads the image at the given C<$path>. The image is set to plane tiling	319	Loads the image at the given C<$path>. The image is set to plane tiling
255	mode.	320	mode.
256		321
257	Loaded images will be cached for one cycle, and shared between temrinals	322	If the image is already in memory (e.g. because another terminal instance
258	running in the same process (e.g. in C<urxvtd>).	323	uses it), then the in-memory copy is returned instead.
259		324
260	#=item load_uc $path	325	=item load_uc $path
261	#	326
262	#Load uncached - same as load, but does not cache the image. This function	327	Load uncached - same as load, but does not cache the image, which means it
263	#is most useufl if you want to optimise a background expression in some	328	is I<always> loaded from the filesystem again, even if another copy of it
264	#way.	329	is in memory at the time.
265		330
266	=cut	331	=cut
		332
		333	sub load_uc($) {
		334	$self->new_img_from_file ($_[0])
		335	}
267		336
268	sub load($) {	337	sub load($) {
269	my ($path) = @_;	338	my ($path) = @_;
270		339
271	$_IMG_CACHE{$path} \|\| do {	340	$_IMG_CACHE{$path} \|\| do {
272	my $img = $self->new_img_from_file ($path);	341	my $img = load_uc $path;
273	Scalar::Util::weaken ($_IMG_CACHE{$path} = $img);	342	Scalar::Util::weaken ($_IMG_CACHE{$path} = $img);
274	$img	343	$img
275	}	344	}
276	}	345	}
277		346
…		…
323		392
324	=item merge $img ...	393	=item merge $img ...
325		394
326	Takes any number of images and merges them together, creating a single	395	Takes any number of images and merges them together, creating a single
327	image containing them all. The tiling mode of the first image is used as	396	image containing them all. The tiling mode of the first image is used as
328	the tiling mdoe of the resulting image.	397	the tiling mode of the resulting image.
329		398
330	This function is called automatically when an expression returns multiple	399	This function is called automatically when an expression returns multiple
331	images.	400	images.
332		401
333	=cut	402	=cut
…		…
362	$base->draw ($_)	431	$base->draw ($_)
363	for @_;	432	for @_;
364		433
365	$base	434	$base
366	}	435	}
		436
		437	=back
367		438
368	=head2 TILING MODES	439	=head2 TILING MODES
369		440
370	The following operators modify the tiling mode of an image, that is, the	441	The following operators modify the tiling mode of an image, that is, the
371	way that pixels outside the image area are painted when the image is used.	442	way that pixels outside the image area are painted when the image is used.
…		…
463		534
464	Return the X and Y coordinates of the terminal window (the terminal	535	Return the X and Y coordinates of the terminal window (the terminal
465	window is the full window by default, and the character area only when in	536	window is the full window by default, and the character area only when in
466	border-respect mode).	537	border-respect mode).
467		538
468	Using these functions make your expression sensitive to window moves.	539	Using these functions makes your expression sensitive to window moves.
469		540
470	These functions are mainly useful to align images to the root window.	541	These functions are mainly useful to align images to the root window.
471		542
472	Example: load an image and align it so it looks as if anchored to the	543	Example: load an image and align it so it looks as if anchored to the
473	background.	544	background (that's exactly what C<rootalign> does btw.):
474		545
475	move -TX, -TY, load "mybg.png"	546	move -TX, -TY, keep { load "mybg.png" }
476		547
477	=item TW	548	=item TW
		549
		550	=item TH
478		551
479	Return the width (C<TW>) and height (C<TH>) of the terminal window (the	552	Return the width (C<TW>) and height (C<TH>) of the terminal window (the
480	terminal window is the full window by default, and the character area only	553	terminal window is the full window by default, and the character area only
481	when in border-respect mode).	554	when in border-respect mode).
482		555
483	Using these functions make your expression sensitive to window resizes.	556	Using these functions makes your expression sensitive to window resizes.
484		557
485	These functions are mainly useful to scale images, or to clip images to	558	These functions are mainly useful to scale images, or to clip images to
486	the window size to conserve memory.	559	the window size to conserve memory.
487		560
488	Example: take the screen background, clip it to the window size, blur it a	561	Example: take the screen background, clip it to the window size, blur it a
489	bit, align it to the window position and use it as background.	562	bit, align it to the window position and use it as background.
490		563
491	clip move -TX, -TY, once { blur 5, root }	564	clip move -TX, -TY, keep { blur 5, root }
492		565
493	=cut	566	=item FOCUS
494		567
		568	Returns a boolean indicating whether the terminal window has keyboard
		569	focus, in which case it returns true.
		570
		571	Using this function makes your expression sensitive to focus changes.
		572
		573	A common use case is to fade the background image when the terminal loses
		574	focus, often together with the C<-fade> command line option. In fact,
		575	there is a special function for just that use case: C<focus_fade>.
		576
		577	Example: use two entirely different background images, depending on
		578	whether the window has focus.
		579
		580	FOCUS ? keep { load "has_focus.jpg" } : keep { load "no_focus.jpg" }
		581
		582	=cut
		583
495	sub TX() { $frame->[FR_AGAIN]{position} = 1; $x }	584	sub TX () { $frame->[FR_AGAIN]{position} = 1; $x }
496	sub TY() { $frame->[FR_AGAIN]{position} = 1; $y }	585	sub TY () { $frame->[FR_AGAIN]{position} = 1; $y }
497	sub TW() { $frame->[FR_AGAIN]{size} = 1; $w }	586	sub TW () { $frame->[FR_AGAIN]{size} = 1; $w }
498	sub TH() { $frame->[FR_AGAIN]{size} = 1; $h }	587	sub TH () { $frame->[FR_AGAIN]{size} = 1; $h }
		588	sub FOCUS() { $frame->[FR_AGAIN]{focus} = 1; $focus }
499		589
500	=item now	590	=item now
501		591
502	Returns the current time as (fractional) seconds since the epoch.	592	Returns the current time as (fractional) seconds since the epoch.
503		593
…		…
510	C<$seconds> seconds.	600	C<$seconds> seconds.
511		601
512	Example: load some image and rotate it according to the time of day (as if it were	602	Example: load some image and rotate it according to the time of day (as if it were
513	the hour pointer of a clock). Update this image every minute.	603	the hour pointer of a clock). Update this image every minute.
514		604
		605	again 60;
515	again 60; rotate 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"	606	rotate 50, 50, (now % 86400) * -72 / 8640, scale keep { load "myclock.png" }
516		607
517	=item counter $seconds	608	=item counter $seconds
518		609
519	Like C<again>, but also returns an increasing counter value, starting at	610	Like C<again>, but also returns an increasing counter value, starting at
520	0, which might be useful for some simple animation effects.	611	0, which might be useful for some simple animation effects.
…		…
549	Clips an image to the given rectangle. If the rectangle is outside the	640	Clips an image to the given rectangle. If the rectangle is outside the
550	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is	641	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is
551	larger than the image, then the tiling mode defines how the extra pixels	642	larger than the image, then the tiling mode defines how the extra pixels
552	will be filled.	643	will be filled.
553		644
554	If C<$x> an C<$y> are missing, then C<0> is assumed for both.	645	If C<$x> and C<$y> are missing, then C<0> is assumed for both.
555		646
556	If C<$width> and C<$height> are missing, then the window size will be	647	If C<$width> and C<$height> are missing, then the window size will be
557	assumed.	648	assumed.
558		649
559	Example: load an image, blur it, and clip it to the window size to save	650	Example: load an image, blur it, and clip it to the window size to save
560	memory.	651	memory.
561		652
562	clip blur 10, load "mybg.png"	653	clip keep { blur 10, load "mybg.png" }
563		654
564	=cut	655	=cut
565		656
566	sub clip($;$$;$$) {	657	sub clip($;$$;$$) {
567	my $img = pop;	658	my $img = pop;
…		…
577	=item scale $width_factor, $height_factor, $img	668	=item scale $width_factor, $height_factor, $img
578		669
579	Scales the image by the given factors in horizontal	670	Scales the image by the given factors in horizontal
580	(C<$width>) and vertical (C<$height>) direction.	671	(C<$width>) and vertical (C<$height>) direction.
581		672
582	If only one factor is give, it is used for both directions.	673	If only one factor is given, it is used for both directions.
583		674
584	If no factors are given, scales the image to the window size without	675	If no factors are given, scales the image to the window size without
585	keeping aspect.	676	keeping aspect.
586		677
587	=item resize $width, $height, $img	678	=item resize $width, $height, $img
…		…
661	the terminal window (or the box specified by C<$width> and C<$height> if	752	the terminal window (or the box specified by C<$width> and C<$height> if
662	given).	753	given).
663		754
664	Example: load an image and center it.	755	Example: load an image and center it.
665		756
666	center pad load "mybg.png"	757	center keep { pad load "mybg.png" }
667		758
668	=item rootalign $img	759	=item rootalign $img
669		760
670	Moves the image so that it appears glued to the screen as opposed to the	761	Moves the image so that it appears glued to the screen as opposed to the
671	window. This gives the illusion of a larger area behind the window. It is	762	window. This gives the illusion of a larger area behind the window. It is
672	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the	763	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the
673	top left of the screen.	764	top left of the screen.
674		765
675	Example: load a background image, put it in mirror mode and root align it.	766	Example: load a background image, put it in mirror mode and root align it.
676		767
677	rootalign mirror load "mybg.png"	768	rootalign keep { mirror load "mybg.png" }
678		769
679	Example: take the screen background and align it, giving the illusion of	770	Example: take the screen background and align it, giving the illusion of
680	transparency as long as the window isn't in front of other windows.	771	transparency as long as the window isn't in front of other windows.
681		772
682	rootalign root	773	rootalign root
…		…
707		798
708	sub rootalign($) {	799	sub rootalign($) {
709	move -TX, -TY, $_[0]	800	move -TX, -TY, $_[0]
710	}	801	}
711		802
712	=item rotate $center_x, $center_y, $degrees	803	=item rotate $center_x, $center_y, $degrees, $img
713		804
714	Rotates the image by C<$degrees> degrees, counter-clockwise, around the	805	Rotates the image clockwise by C<$degrees> degrees, around the point at
715	pointer at C<$center_x> and C<$center_y> (specified as factor of image	806	C<$center_x> and C<$center_y> (specified as factor of image width/height).
716	width/height).
717		807
718	#TODO# new width, height, maybe more operators?
719
720	Example: rotate the image by 90 degrees	808	Example: rotate the image by 90 degrees around its center.
		809
		810	rotate 0.5, 0.5, 90, keep { load "$HOME/mybg.png" }
721		811
722	=cut	812	=cut
723		813
724	sub rotate($$$$) {	814	sub rotate($$$$) {
725	my $img = pop;	815	my $img = pop;
…		…
736		826
737	The following operators change the pixels of the image.	827	The following operators change the pixels of the image.
738		828
739	=over 4	829	=over 4
740		830
		831	=item tint $color, $img
		832
		833	Tints the image in the given colour.
		834
		835	Example: tint the image red.
		836
		837	tint "red", load "rgb.png"
		838
		839	Example: the same, but specify the colour by component.
		840
		841	tint [1, 0, 0], load "rgb.png"
		842
		843	=cut
		844
		845	sub tint($$) {
		846	$_[1]->tint ($_[0])
		847	}
		848
		849	=item shade $factor, $img
		850
		851	Shade the image by the given factor.
		852
		853	=cut
		854
		855	sub shade($$) {
		856	$_[1]->shade ($_[0])
		857	}
		858
741	=item contrast $factor, $img	859	=item contrast $factor, $img
742		860
743	=item contrast $r, $g, $b, $img	861	=item contrast $r, $g, $b, $img
744		862
745	=item contrast $r, $g, $b, $a, $img	863	=item contrast $r, $g, $b, $a, $img
…		…
774	latter in a white picture.	892	latter in a white picture.
775		893
776	Due to idiosyncrasies in the underlying XRender extension, biases less	894	Due to idiosyncrasies in the underlying XRender extension, biases less
777	than zero can be I<very> slow.	895	than zero can be I<very> slow.
778		896
		897	You can also try the experimental(!) C<muladd> operator.
		898
779	=cut	899	=cut
780		900
781	sub contrast($$;$$;$) {	901	sub contrast($$;$$;$) {
782	my $img = pop;	902	my $img = pop;
783	my ($r, $g, $b, $a) = @_;	903	my ($r, $g, $b, $a) = @_;
…		…
798	$a = 1 if @_ < 4;	918	$a = 1 if @_ < 4;
799		919
800	$img = $img->clone;	920	$img = $img->clone;
801	$img->brightness ($r, $g, $b, $a);	921	$img->brightness ($r, $g, $b, $a);
802	$img	922	$img
		923	}
		924
		925	=item muladd $mul, $add, $img # EXPERIMENTAL
		926
		927	First multiplies the pixels by C<$mul>, then adds C<$add>. This can be used
		928	to implement brightness and contrast at the same time, with a wider value
		929	range than contrast and brightness operators.
		930
		931	Due to numerous bugs in XRender implementations, it can also introduce a
		932	number of visual artifacts.
		933
		934	Example: increase contrast by a factor of C<$c> without changing image
		935	brightness too much.
		936
		937	muladd $c, (1 - $c) * 0.5, $img
		938
		939	=cut
		940
		941	sub muladd($$$) {
		942	$_[2]->muladd ($_[0], $_[1])
803	}	943	}
804		944
805	=item blur $radius, $img	945	=item blur $radius, $img
806		946
807	=item blur $radius_horz, $radius_vert, $img	947	=item blur $radius_horz, $radius_vert, $img
…		…
819	sub blur($$;$) {	959	sub blur($$;$) {
820	my $img = pop;	960	my $img = pop;
821	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])	961	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
822	}	962	}
823		963
		964	=item focus_fade $img
		965
		966	=item focus_fade $factor, $img
		967
		968	=item focus_fade $factor, $color, $img
		969
		970	Fades the image by the given factor (and colour) when focus is lost (the
		971	same as the C<-fade>/C<-fadecolor> command line options, which also supply
		972	the default values for C<factor> and C<$color>. Unlike with C<-fade>, the
		973	C<$factor> is a real value, not a percentage value (that is, 0..1, not
		974	0..100).
		975
		976	Example: do the right thing when focus fading is requested.
		977
		978	focus_fade load "mybg.jpg";
		979
		980	=cut
		981
		982	sub focus_fade($;$$) {
		983	my $img = pop;
		984
		985	return $img
		986	if FOCUS;
		987
		988	my $fade = @_ >= 1 ? $_[0] : defined $self->resource ("fade") ? $self->resource ("fade") * 0.01 : 0;
		989	my $color = @_ >= 2 ? $_[1] : $self->resource ("color+" . urxvt::Color_fade);
		990
		991	$img = $img->tint ($color) if $color ne "rgb:00/00/00";
		992	$img = $img->muladd (1 - $fade, 0) if $fade;
		993
		994	$img
		995	}
		996
824	=back	997	=back
825		998
826	=head2 OTHER STUFF	999	=head2 OTHER STUFF
827		1000
828	Anything that didn't fit any of the other categories, even after applying	1001	Anything that didn't fit any of the other categories, even after applying
829	force and closing our eyes.	1002	force and closing our eyes.
830		1003
831	=over 4	1004	=over 4
832		1005
833	=item once { ... }	1006	=item keep { ... }
834		1007
835	This function takes a code block as argument, that is, one or more	1008	This operator takes a code block as argument, that is, one or more
836	statements enclosed by braces.	1009	statements enclosed by braces.
837		1010
838	The trick is that this code block is only evaluated once - future calls	1011	The trick is that this code block is only evaluated when the outcome
839	will simply return the original image (yes, it should only be used with	1012	changes - on other calls the C<keep> simply returns the image it computed
840	images).	1013	previously (yes, it should only be used with images). Or in other words,
		1014	C<keep> I<caches> the result of the code block so it doesn't need to be
		1015	computed again.
841		1016
842	This can be extremely useful to avoid redoing the same slow operations	1017	This can be extremely useful to avoid redoing slow operations - for
843	again and again- for example, if your background expression takes the root	1018	example, if your background expression takes the root background, blurs it
844	background, blurs it and then root-aligns it it would have to blur the	1019	and then root-aligns it it would have to blur the root background on every
845	root background on every window move or resize.	1020	window move or resize.
		1021
		1022	Another example is C<load>, which can be quite slow.
846		1023
847	In fact, urxvt itself encloses the whole expression in some kind of	1024	In fact, urxvt itself encloses the whole expression in some kind of
848	C<once> block so it only is reevaluated as required.	1025	C<keep> block so it only is reevaluated as required.
849		1026
850	Putting the blur into a C<once> block will make sure the blur is only done	1027	Putting the blur into a C<keep> block will make sure the blur is only done
851	once:	1028	once, while the C<rootalign> is still done each time the window moves.
852		1029
853	rootlign once { blur 10, root }	1030	rootalign keep { blur 10, root }
854		1031
855	This leaves the question of how to force reevaluation of the block,	1032	This leaves the question of how to force reevaluation of the block,
856	in case the root background changes: If expression inside the block	1033	in case the root background changes: If expression inside the block
857	is sensitive to some event (root background changes, window geometry	1034	is sensitive to some event (root background changes, window geometry
858	changes), then it will be reevaluated automatically as needed.	1035	changes), then it will be reevaluated automatically as needed.
859		1036
860	=item once_again	1037	=back
861		1038
862	Resets all C<once> block as if they had never been called, i.e. on the	1039	=head1 OLD BACKGROUND IMAGE SETTINGS
863	next call they will be reevaluated again.
864		1040
865	=cut	1041	This extension also provides support for the old options/resources and
		1042	OSC sequences for setting a background image. These settings are
		1043	B<deprecated> and will be removed in future versions.
866		1044
		1045	=head2 OPTIONS AND RESOURCES
		1046
		1047	=over 4
		1048
		1049	=item B<-pixmap> I<file[;oplist]>
		1050
		1051	=item B<backgroundPixmap:> I<file[;oplist]>
		1052
		1053	Use the specified image file as the window's background and also
		1054	optionally specify a colon separated list of operations to modify it.
		1055	Note that you may need to quote the C<;> character when using the
		1056	command line option, as C<;> is usually a metacharacter in shells.
		1057	Supported operations are:
		1058
		1059	=over 4
		1060
		1061	=item B<WxH+X+Y>
		1062
		1063	sets scale and position. B<"W" / "H"> specify the horizontal/vertical
		1064	scale (percent), and B<"X" / "Y"> locate the image centre (percent). A
		1065	scale of 0 disables scaling.
		1066
		1067	=item B<op=tile>
		1068
		1069	enables tiling
		1070
		1071	=item B<op=keep-aspect>
		1072
		1073	maintain the image aspect ratio when scaling
		1074
		1075	=item B<op=root-align>
		1076
		1077	use the position of the terminal window relative to the root window as
		1078	the image offset, simulating a root window background
		1079
		1080	=back
		1081
		1082	The default scale and position setting is C<100x100+50+50>.
		1083	Alternatively, a predefined set of templates can be used to achieve
		1084	the most common setups:
		1085
		1086	=over 4
		1087
		1088	=item B<style=tiled>
		1089
		1090	the image is tiled with no scaling. Equivalent to 0x0+0+0:op=tile
		1091
		1092	=item B<style=aspect-stretched>
		1093
		1094	the image is scaled to fill the whole window maintaining the aspect
		1095	ratio and centered. Equivalent to 100x100+50+50:op=keep-aspect
		1096
		1097	=item B<style=stretched>
		1098
		1099	the image is scaled to fill the whole window. Equivalent to 100x100
		1100
		1101	=item B<style=centered>
		1102
		1103	the image is centered with no scaling. Equivalent to 0x0+50+50
		1104
		1105	=item B<style=root-tiled>
		1106
		1107	the image is tiled with no scaling and using 'root' positioning.
		1108	Equivalent to 0x0:op=tile:op=root-align
		1109
		1110	=back
		1111
		1112	If multiple templates are specified the last one wins. Note that a
		1113	template overrides all the scale, position and operations settings.
		1114
		1115	If used in conjunction with pseudo-transparency, the specified image
		1116	will be blended over the transparent background using alpha-blending.
		1117
		1118	=item B<-tr>\|B<+tr>
		1119
		1120	=item B<transparent:> I<boolean>
		1121
		1122	Turn on/off pseudo-transparency by using the root pixmap as background.
		1123
		1124	=item B<-tint> I<colour>
		1125
		1126	=item B<tintColor:> I<colour>
		1127
		1128	Tint the transparent background with the given colour. Note that a
		1129	black tint yields a completely black image while a white tint yields
		1130	the image unchanged.
		1131
		1132	=item B<-sh> I<number>
		1133
		1134	=item B<shading:> I<number>
		1135
		1136	Darken (0 .. 99) or lighten (101 .. 200) the transparent background.
		1137	A value of 100 means no shading.
		1138
		1139	=item B<-blr> I<HxV>
		1140
		1141	=item B<blurRadius:> I<HxV>
		1142
		1143	Apply gaussian blur with the specified radius to the transparent
		1144	background. If a single number is specified, the vertical and
		1145	horizontal radii are considered to be the same. Setting one of the
		1146	radii to 1 and the other to a large number creates interesting effects
		1147	on some backgrounds. The maximum radius value is 128. An horizontal or
		1148	vertical radius of 0 disables blurring.
		1149
		1150	=back
		1151
		1152	=head2 OSC sequences
		1153
		1154	=over 4
		1155
		1156	=item B<< C<ESC ] 705 ; Pt ST> >> Change transparent background tint colour to B<< C<Pt> >>.
		1157
		1158	=item B<< C<ESC ] 20 ; Pt ST> >> Change/Query background image
		1159	parameters: the value of B<< C<Pt> >> can be one of the following
		1160	commands:
		1161
		1162	=over 4
		1163
		1164	=item B<< C<?> >>
		1165
		1166	display scale and position in the title
		1167
		1168	=item B<< C<;WxH+X+Y> >>
		1169
		1170	change scale and/or position
		1171
		1172	=item B<< C<FILE;WxH+X+Y> >>
		1173
		1174	change background image
		1175
		1176	=back
		1177
		1178	=cut
		1179
867	sub once(&) {	1180	sub keep(&) {
868	my $id = $_[0]+0;	1181	my $id = $_[0]+0;
869		1182
870	local $frame = $self->{frame_cache}{$id} \|\|= [$frame];	1183	local $frame = $self->{frame_cache}{$id} \|\|= [$frame];
871		1184
872	unless ($frame->[FR_CACHE]) {	1185	unless ($frame->[FR_CACHE]) {
…		…
879	# clear this frame cache, also for all parents	1192	# clear this frame cache, also for all parents
880	for (my $frame = $frame; $frame; $frame = $frame->[0]) {	1193	for (my $frame = $frame; $frame; $frame = $frame->[0]) {
881	undef $frame->[FR_CACHE];	1194	undef $frame->[FR_CACHE];
882	}	1195	}
883		1196
884	unless ($self->{term}) {
885	use Data::Dump;
886	ddx $frame;
887	exit;
888	}
889
890	$self->recalculate;	1197	$self->recalculate;
891	});	1198	});
892	};	1199	};
893		1200
894	# in scalar context we always return the first original result, which	1201	# in scalar context we always return the first original result, which
…		…
896	wantarray	1203	wantarray
897	? @{ $frame->[FR_CACHE] }	1204	? @{ $frame->[FR_CACHE] }
898	: $frame->[FR_CACHE][0]	1205	: $frame->[FR_CACHE][0]
899	}	1206	}
900		1207
901	sub once_again() {	1208	# sub keep_clear() {
902	delete $self->{frame_cache};	1209	# delete $self->{frame_cache};
903	}	1210	# }
904		1211
905	=back	1212	=back
906		1213
907	=cut	1214	=cut
908		1215
…		…
921		1228
922	# compiles a parsed expression	1229	# compiles a parsed expression
923	sub set_expr {	1230	sub set_expr {
924	my ($self, $expr) = @_;	1231	my ($self, $expr) = @_;
925		1232
926	$self->{root} = [];	1233	$self->{root} = []; # the outermost frame
927	$self->{expr} = $expr;	1234	$self->{expr} = $expr;
928	$self->recalculate;	1235	$self->recalculate;
929	}	1236	}
930		1237
931	# takes a hash of sensitivity indicators and installs watchers	1238	# takes a hash of sensitivity indicators and installs watchers
…		…
972	if ($again->{rootpmap}) {	1279	if ($again->{rootpmap}) {
973	$state->{rootpmap} = $self->on (rootpmap_change => $cb);	1280	$state->{rootpmap} = $self->on (rootpmap_change => $cb);
974	} else {	1281	} else {
975	delete $state->{rootpmap};	1282	delete $state->{rootpmap};
976	}	1283	}
		1284
		1285	if ($again->{focus}) {
		1286	$state->{focus} = $self->on (focus_in => $cb, focus_out => $cb);
		1287	} else {
		1288	delete $state->{focus};
		1289	}
977	}	1290	}
978		1291
979	# evaluate the current bg expression	1292	# evaluate the current bg expression
980	sub recalculate {	1293	sub recalculate {
981	my ($arg_self) = @_;	1294	my ($arg_self) = @_;
…		…
993		1306
994	# set environment to evaluate user expression	1307	# set environment to evaluate user expression
995		1308
996	local $self = $arg_self;	1309	local $self = $arg_self;
997	local $HOME = $ENV{HOME};	1310	local $HOME = $ENV{HOME};
998	local $frame = [];	1311	local $frame = $self->{root};
999		1312
1000	($x, $y, $w, $h) = $self->background_geometry ($self->{border});	1313	($x, $y, $w, $h) = $self->background_geometry ($self->{border});
		1314	$focus = $self->focus;
1001		1315
1002	# evaluate user expression	1316	# evaluate user expression
1003		1317
1004	my @img = eval { $self->{expr}->() };	1318	my @img = eval { $self->{expr}->() };
1005	die $@ if $@;	1319	die $@ if $@;
…		…
1023	# }	1337	# }
1024		1338
1025	# set background pixmap	1339	# set background pixmap
1026		1340
1027	$self->set_background ($img, $self->{border});	1341	$self->set_background ($img, $self->{border});
1028	$self->scr_recolour (0);	1342	$self->scr_recolor (0);
1029	$self->want_refresh;	1343	$self->want_refresh;
1030	}	1344	}
1031		1345
		1346	sub old_bg_opts {
		1347	my ($self, $arg) = @_;
		1348
		1349	$arg or return;
		1350
		1351	my @str = split /;/, $arg;
		1352
		1353	return unless $str[0] or $self->{bg_opts}->{path};
		1354
		1355	my $bg_opts = $self->{bg_opts};
		1356
		1357	if ($str[0]) {
		1358	$bg_opts->{tile} = 0;
		1359	$bg_opts->{keep_aspect} = 0;
		1360	$bg_opts->{root_align} = 0;
		1361	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 100;
		1362	$bg_opts->{h_align} = $bg_opts->{v_align} = 50;
		1363	$bg_opts->{path} = unpack "H*", $str[0];
		1364	}
		1365
		1366	my @oplist = split /:/, $str[1];
		1367
		1368	for (@oplist) {
		1369	if (/style=tiled/i) {
		1370	$bg_opts->{tile} = 1;
		1371	$bg_opts->{keep_aspect} = 0;
		1372	$bg_opts->{root_align} = 0;
		1373	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 0;
		1374	$bg_opts->{h_align} = $bg_opts->{v_align} = 0;
		1375	} elsif (/style=aspect-stretched/i) {
		1376	$bg_opts->{tile} = 0;
		1377	$bg_opts->{keep_aspect} = 1;
		1378	$bg_opts->{root_align} = 0;
		1379	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 100;
		1380	$bg_opts->{h_align} = $bg_opts->{v_align} = 50;
		1381	} elsif (/style=stretched/i) {
		1382	$bg_opts->{tile} = 0;
		1383	$bg_opts->{keep_aspect} = 0;
		1384	$bg_opts->{root_align} = 0;
		1385	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 100;
		1386	$bg_opts->{h_align} = $bg_opts->{v_align} = 50;
		1387	} elsif (/style=centered/i) {
		1388	$bg_opts->{tile} = 0;
		1389	$bg_opts->{keep_aspect} = 0;
		1390	$bg_opts->{root_align} = 0;
		1391	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 0;
		1392	$bg_opts->{h_align} = $bg_opts->{v_align} = 50;
		1393	} elsif (/style=root-tiled/i) {
		1394	$bg_opts->{tile} = 1;
		1395	$bg_opts->{keep_aspect} = 0;
		1396	$bg_opts->{root_align} = 1;
		1397	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 0;
		1398	$bg_opts->{h_align} = $bg_opts->{v_align} = 0;
		1399	} elsif (/op=tile/i) {
		1400	$bg_opts->{tile} = 1;
		1401	} elsif (/op=keep_aspect/i) {
		1402	$bg_opts->{keep_aspect} = 1;
		1403	} elsif (/op=root_align/i) {
		1404	$bg_opts->{root_align} = 1;
		1405	} elsif (/^ =? ([0-9]+)? (?:[xX] ([0-9]+))? ([+-][0-9]+)? ([+-][0-9]+)? $/x) {
		1406	my ($w, $h, $x, $y) = ($1, $2, $3, $4);
		1407
		1408	if ($str[0]) {
		1409	$w = $h unless defined $w;
		1410	$h = $w unless defined $h;
		1411	$y = $x unless defined $y;
		1412	}
		1413
		1414	$bg_opts->{h_scale} = $w if defined $w;
		1415	$bg_opts->{v_scale} = $h if defined $h;
		1416	$bg_opts->{h_align} = $x if defined $x;
		1417	$bg_opts->{v_align} = $y if defined $y;
		1418	}
		1419	}
		1420	}
		1421
		1422	sub old_bg_expr {
		1423	my ($self) = @_;
		1424
		1425	my $expr;
		1426
		1427	my $bg_opts = $self->{bg_opts};
		1428
		1429	if ($bg_opts->{root}) {
		1430	$expr .= "tile (";
		1431
		1432	my $shade = $bg_opts->{shade};
		1433
		1434	if ($shade) {
		1435	$shade = List::Util::min $shade, 200;
		1436	$shade = List::Util::max $shade, -100;
		1437	$shade = 200 - (100 + $shade) if $shade < 0;
		1438
		1439	$shade = $shade * 0.01 - 1;
		1440	$expr .= "shade $shade, ";
		1441	}
		1442
		1443	my $tint = $bg_opts->{tint};
		1444
		1445	if ($tint) {
		1446	$expr .= "tint $tint, ";
		1447	}
		1448
		1449	my $blur = $bg_opts->{blur};
		1450
		1451	if ($blur and $blur =~ /^ =? ([0-9]+)? (?:[xX] ([0-9]+))? $/x) {
		1452	my $hr = defined $1 ? $1 : 1;
		1453	my $vr = defined $2 ? $2 : $hr;
		1454
		1455	if ($hr != 0 and $vr != 0) {
		1456	$expr .= "blur $hr, $vr, ";
		1457	}
		1458	}
		1459
		1460	$expr .= "rootalign root)";
		1461	}
		1462
		1463	if ($bg_opts->{path}) {
		1464	my $file_expr;
		1465	my $h_scale = $bg_opts->{h_scale} * 0.01;
		1466	my $v_scale = $bg_opts->{v_scale} * 0.01;
		1467	my $h_align = $bg_opts->{h_align} * 0.01;
		1468	my $v_align = $bg_opts->{v_align} * 0.01;
		1469
		1470	if (!$bg_opts->{tile}) {
		1471	$file_expr .= "pad (";
		1472	} else {
		1473	$file_expr .= "tile (";
		1474	}
		1475
		1476	if ($bg_opts->{root_align}) {
		1477	$file_expr .= "rootalign ";
		1478	} else {
		1479	$file_expr .= "align $h_align, $v_align, ";
		1480	}
		1481
		1482	if ($h_scale != 0 and $v_scale != 0) {
		1483	my $op = $bg_opts->{keep_aspect} ? "fit" : "resize";
		1484	$file_expr .= "$op TW * $h_scale, TH * $v_scale, ";
		1485	}
		1486
		1487	$file_expr .= "keep { load pack \"H*\", \"$bg_opts->{path}\" })";
		1488
		1489	if ($expr) {
		1490	$expr .= ", tint (\"[50]white\", $file_expr)";
		1491	} else {
		1492	$expr = $file_expr;
		1493	}
		1494	}
		1495
		1496	$expr
		1497	}
		1498
		1499	sub on_osc_seq {
		1500	my ($self, $op, $arg) = @_;
		1501
		1502	$self->{bg_opts} or return;
		1503
		1504	$op =~ /^(20\|705)$/ or return;
		1505
		1506	if ($op eq "20") {
		1507	if ($arg eq "?") {
		1508	my $h_scale = $self->{bg_opts}->{h_scale};
		1509	my $v_scale = $self->{bg_opts}->{v_scale};
		1510	my $h_align = $self->{bg_opts}->{h_align};
		1511	my $v_align = $self->{bg_opts}->{v_align};
		1512	$self->cmd_parse ("\033]2;[${h_scale}x${v_scale}+${h_align}+${v_align}]\007");
		1513	} else {
		1514	$self->old_bg_opts ($arg);
		1515	my $expr = $self->old_bg_expr;
		1516	$self->set_expr (parse_expr $expr) if $expr;
		1517	}
		1518	} elsif ($op eq "705") {
		1519	$self->{bg_opts}->{tint} = $arg;
		1520	my $expr = $self->old_bg_expr;
		1521	$self->set_expr (parse_expr $expr) if $expr;
		1522	}
		1523
		1524	1
		1525	}
		1526
		1527	sub find_resource {
		1528	my ($self, $a, $b) = @_;
		1529
		1530	my $v = $self->x_resource ($a);
		1531	$v = $self->x_resource ($b) unless defined $v;
		1532
		1533	$v
		1534	}
		1535
1032	sub on_start {	1536	sub on_start {
1033	my ($self) = @_;	1537	my ($self) = @_;
1034		1538
1035	my $expr = $self->x_resource ("%.expr")	1539	my $expr = $self->x_resource ("%.expr");
		1540
		1541	if (!$expr) {
		1542	$self->{bg_opts} = { h_scale => 100, v_scale => 100,
		1543	h_align => 50, v_align => 50 };
		1544
		1545	$self->{bg_opts}->{shade} = $self->find_resource ("shading", "sh");
		1546	$self->{bg_opts}->{tint} = $self->find_resource ("tintColor", "tint");
		1547	$self->{bg_opts}->{blur} = $self->find_resource ("blurRadius", "blr");
		1548	if ($self->x_resource_boolean ("transparent")
		1549	or $self->x_resource_boolean ("tr")) {
		1550	$self->{bg_opts}->{root} = 1;
		1551	}
		1552
		1553	$self->old_bg_opts ($self->find_resource ("backgroundPixmap", "pixmap"));
		1554	$expr = $self->old_bg_expr;
		1555	}
		1556
1036	or return;	1557	$expr or return;
1037		1558
1038	$self->has_render	1559	$self->has_render
1039	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";	1560	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";
1040		1561
1041	$self->set_expr (parse_expr $expr);	1562	$self->set_expr (parse_expr $expr);

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.63 by root, Tue Jun 19 18:17:56 2012 UTC vs. Revision 1.92 by sf-exg, Thu Jul 14 05:33:26 2016 UTC

Diff Legend

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.63 by root, Tue Jun 19 18:17:56 2012 UTC vs.
Revision 1.92 by sf-exg, Thu Jul 14 05:33:26 2016 UTC