[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 1.103 by root, Fri Nov 26 18:49:48 2021 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
		16	#:META:OSC:20:change/query background image
		17	#:META:OSC:705:change transparent background tint colour
6		18
7	=head1 NAME	19	=head1 NAME
8		20
9	background - manage terminal background	21	background - manage terminal background
10		22
11	=head1 SYNOPSIS	23	=head1 SYNOPSIS
12		24
13	urxvt --background-expr 'background expression'	25	urxvt --background-expr 'background expression'
14	--background-border	26	--background-border
15	--background-interval seconds	27	--background-interval seconds
16		28
		29	=head1 QUICK AND DIRTY CHEAT SHEET
		30
		31	Load a random jpeg image and tile the background with it without scaling
		32	or anything else:
		33
		34	load "/path/to/img.jpg"
		35
		36	The same, but use mirroring/reflection instead of tiling:
		37
		38	mirror load "/path/to/img.jpg"
		39
		40	Load an image and scale it to exactly fill the terminal window:
		41
		42	scale keep { load "/path/to/img.jpg" }
		43
		44	Implement pseudo-transparency by using a suitably-aligned root pixmap
		45	as window background:
		46
		47	rootalign root
		48
		49	Likewise, but keep a blurred copy:
		50
		51	rootalign keep { blur 10, root }
		52
17	=head1 DESCRIPTION	53	=head1 DESCRIPTION
18		54
19	This extension manages the terminal background by creating a picture that	55	This extension manages the terminal background by creating a picture that
20	is behind the text, replacing the normal background colour.	56	is behind the text, replacing the normal background colour.
21		57
26	to be as simple as possible.	62	to be as simple as possible.
27		63
28	For example, to load an image and scale it to the window size, you would	64	For example, to load an image and scale it to the window size, you would
29	use:	65	use:
30		66
31	urxvt --background-expr 'scale load "/path/to/mybg.png"'	67	urxvt --background-expr 'scale keep { load "/path/to/mybg.png" }'
32		68
33	Or specified as a X resource:	69	Or specified as a X resource:
34		70
35	URxvt.background-expr: scale load "/path/to/mybg.png"	71	URxvt.background.expr: scale keep { load "/path/to/mybg.png" }
36		72
37	=head1 THEORY OF OPERATION	73	=head1 THEORY OF OPERATION
38		74
39	At startup, just before the window is mapped for the first time, the	75	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	76	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	89	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	90	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	91	pixmap is replaced by another one the root background changes; or when the
56	timer elapses), then the expression will be evaluated again.	92	timer elapses), then the expression will be evaluated again.
57		93
58	For example, an expression such as C<scale load "$HOME/mybg.png"> scales the	94	For example, an expression such as C<scale keep { load "$HOME/mybg.png"
59	image to the window size, so it relies on the window size and will	95	}> 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	96	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	97	example. That ensures that the picture always fills the terminal, even
62	after its size changes.	98	after its size changes.
63		99
64	=head2 EXPRESSIONS	100	=head2 EXPRESSIONS
65		101
66	Expressions are normal Perl expressions, in fact, they are Perl blocks -	102	Expressions are normal Perl expressions, in fact, they are Perl blocks -
67	which means you could use multiple lines and statements:	103	which means you could use multiple lines and statements:
68		104
		105	scale keep {
69	again 3600;	106	again 3600;
70	if (localtime now)[6]) {	107	if (localtime now)[6]) {
71	return scale load "$HOME/weekday.png";	108	return load "$HOME/weekday.png";
72	} else {	109	} else {
73	return scale load "$HOME/sunday.png";	110	return load "$HOME/sunday.png";
		111	}
74	}	112	}
75		113
76	This expression is evaluated once per hour. It will set F<sunday.png> as	114	This inner expression is evaluated once per hour (and whenever the
		115	terminal window is resized). It sets F<sunday.png> as background on
77	background on Sundays, and F<weekday.png> on all other days.	116	Sundays, and F<weekday.png> on all other days.
78		117
79	Fortunately, we expect that most expressions will be much simpler, with	118	Fortunately, we expect that most expressions will be much simpler, with
80	little Perl knowledge needed.	119	little Perl knowledge needed.
81		120
82	Basically, you always start with a function that "generates" an image	121	Basically, you always start with a function that "generates" an image
…		…
105	get a percentage):	144	get a percentage):
106		145
107	scale 2, load "$HOME/mypic.png"	146	scale 2, load "$HOME/mypic.png"
108		147
109	This enlarges the image by a factor of 2 (200%). As you can see, C<scale>	148	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	149	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	150	C<load> only has one argument. Arguments are separated from each other by
112	commas.	151	commas.
113		152
114	Scale also accepts two arguments, which are then separate factors for both	153	Scale also accepts two arguments, which are then separate factors for both
115	horizontal and vertical dimensions. For example, this halves the image	154	horizontal and vertical dimensions. For example, this halves the image
116	width and doubles the image height:	155	width and doubles the image height:
117		156
118	scale 0.5, 2, load "$HOME/mypic.png"	157	scale 0.5, 2, load "$HOME/mypic.png"
119		158
120	Other effects than scaling are also readily available, for example, you can	159	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:	160	because each time the terminal is resized, it loads the PNG image again
		161	and scales it. Scaling is usually fast (and unavoidable), but loading the
		162	image can be quite time consuming. This is where C<keep> comes in handy:
122		163
		164	scale 0.5, 2, keep { load "$HOME/mypic.png" }
		165
		166	The C<keep> operator executes all the statements inside the braces only
		167	once, or when it thinks the outcome might change. In other cases it
		168	returns the last value computed by the brace block.
		169
		170	This means that the C<load> is only executed once, which makes it much
		171	faster, but also means that more memory is being used, because the loaded
		172	image must be kept in memory at all times. In this expression, the
		173	trade-off is likely worth it.
		174
		175	But back to effects: Other effects than scaling are also readily
		176	available, for example, you can tile the image to fill the whole window,
		177	instead of resizing it:
		178
123	tile load "$HOME/mypic.png"	179	tile keep { load "$HOME/mypic.png" }
124		180
125	In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator	181	In fact, images returned by C<load> are in C<tile> mode by default, so the
126	is kind of superfluous.	182	C<tile> operator is kind of superfluous.
127		183
128	Another common effect is to mirror the image, so that the same edges touch:	184	Another common effect is to mirror the image, so that the same edges
		185	touch:
129		186
130	mirror load "$HOME/mypic.png"	187	mirror keep { load "$HOME/mypic.png" }
131		188
132	This is also a typical background expression:	189	Another common background expression is:
133		190
134	rootalign root	191	rootalign root
135		192
136	It first takes a snapshot of the screen background image, and then	193	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	194	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	195	left corner of the terminal window)- the result is pseudo-transparency:
139	moved around.	196	the image seems to be static while the window is moved around.
140		197
141	=head2 CYCLES AND CACHING	198	=head2 COLOUR SPECIFICATIONS
142		199
143	=head3 C<load> et al.	200	Whenever an operator expects a "colour", then this can be specified in one
		201	of two ways: Either as string with an X11 colour specification, such as:
144		202
145	As has been mentioned before, the expression might be evaluated multiple	203	"red" # named colour
146	times. Each time the expression is reevaluated, a new cycle is said to	204	"#f00" # simple rgb
147	have begun. Many operators cache their results till the next cycle.	205	"[50]red" # red with 50% alpha
		206	"TekHVC:300/50/50" # anything goes
148		207
149	For example, the C<load> operator keeps a copy of the image. If it is	208	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		209
153	This only works for one cycle though, so as long as you load the same	210	[0.5] # 50% gray, 100% alpha
154	image every time, it will always be cached, but when you load a different	211	[0.5, 0, 0] # dark red, no green or blur, 100% alpha
155	image, it will forget about the first one.	212	[0.5, 0, 0, 0.7] # same with explicit 70% alpha
156		213
157	This allows you to either speed things up by keeping multiple images in	214	=head2 CACHING AND SENSITIVITY
158	memory, or conserve memory by loading images more often.
159		215
160	For example, you can keep two images in memory and use a random one like	216	Since some operations (such as C<load> and C<blur>) can take a long time,
161	this:	217	caching results can be very important for a smooth operation. Caching can
		218	also be useful to reduce memory usage, though, for example, when an image
		219	is cached by C<load>, it could be shared by multiple terminal windows
		220	running inside urxvtd.
162		221
163	my $img1 = load "img1.png";	222	=head3 C<keep { ... }> caching
164	my $img2 = load "img2.png";
165	(0.5 > rand) ? $img1 : $img2
166		223
167	Since both images are "loaded" every time the expression is evaluated,	224	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<{}>	225	... }>. The C<keep> operator takes a block of multiple statements enclosed
182	and evaluates it only.. once, returning any images the last statement	226	by C<{}> and keeps the return value in memory.
183	returned. Further calls simply produce the values from the cache.
184		227
		228	An expression can be "sensitive" to various external events, such as
		229	scaling or moving the window, root background changes and timers. Simply
		230	using an expression (such as C<scale> without parameters) that depends on
		231	certain changing values (called "variables"), or using those variables
		232	directly, will make an expression sensitive to these events - for example,
		233	using C<scale> or C<TW> will make the expression sensitive to the terminal
		234	size, and thus to resizing events.
		235
		236	When such an event happens, C<keep> will automatically trigger a
		237	reevaluation of the whole expression with the new value of the expression.
		238
185	This is most useful for expensive operations, such as C<blur>:	239	C<keep> is most useful for expensive operations, such as C<blur>:
186		240
187	rootalign once { blur 20, root }	241	rootalign keep { blur 20, root }
188		242
189	This makes a blurred copy of the root background once, and on subsequent	243	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	244	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	245	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	246	blurred pixmap) with speed (blur only needs to be redone when root
193	changes).	247	changes).
194		248
		249	=head3 C<load> caching
		250
		251	The C<load> operator itself does not keep images in memory, but as long as
		252	the image is still in memory, C<load> will use the in-memory image instead
		253	of loading it freshly from disk.
		254
		255	That means that this expression:
		256
		257	keep { load "$HOME/path..." }
		258
		259	Not only caches the image in memory, other terminal instances that try to
		260	C<load> it can reuse that in-memory copy.
		261
195	=head1 REFERENCE	262	=head1 REFERENCE
196		263
197	=head2 COMMAND LINE SWITCHES	264	=head2 COMMAND LINE SWITCHES
198		265
199	=over 4	266	=over
200		267
201	=item --background-expr perl-expression	268	=item --background-expr perl-expression
202		269
203	Specifies the Perl expression to evaluate.	270	Specifies the Perl expression to evaluate.
204		271
…		…
224	=cut	291	=cut
225		292
226	our %_IMG_CACHE;	293	our %_IMG_CACHE;
227	our $HOME;	294	our $HOME;
228	our ($self, $frame);	295	our ($self, $frame);
229	our ($x, $y, $w, $h);	296	our ($x, $y, $w, $h, $focus);
230		297
231	# enforce at least this interval between updates	298	# enforce at least this interval between updates
232	our $MIN_INTERVAL = 6/59.951;	299	our $MIN_INTERVAL = 6/59.951;
233		300
234	{	301	{
…		…
245		312
246	These functions provide an image, by loading it from disk, grabbing it	313	These functions provide an image, by loading it from disk, grabbing it
247	from the root screen or by simply generating it. They are used as starting	314	from the root screen or by simply generating it. They are used as starting
248	points to get an image you can play with.	315	points to get an image you can play with.
249		316
250	=over 4	317	=over
251		318
252	=item load $path	319	=item load $path
253		320
254	Loads the image at the given C<$path>. The image is set to plane tiling	321	Loads the image at the given C<$path>. The image is set to plane tiling
255	mode.	322	mode.
256		323
257	Loaded images will be cached for one cycle, and shared between temrinals	324	If the image is already in memory (e.g. because another terminal instance
258	running in the same process (e.g. in C<urxvtd>).	325	uses it), then the in-memory copy is returned instead.
259		326
260	#=item load_uc $path	327	=item load_uc $path
261	#	328
262	#Load uncached - same as load, but does not cache the image. This function	329	Load uncached - same as load, but does not cache the image, which means it
263	#is most useufl if you want to optimise a background expression in some	330	is I<always> loaded from the filesystem again, even if another copy of it
264	#way.	331	is in memory at the time.
265		332
266	=cut	333	=cut
		334
		335	sub load_uc($) {
		336	$self->new_img_from_file ($_[0])
		337	}
267		338
268	sub load($) {	339	sub load($) {
269	my ($path) = @_;	340	my ($path) = @_;
270		341
271	$_IMG_CACHE{$path} \|\| do {	342	$_IMG_CACHE{$path} \|\| do {
272	my $img = $self->new_img_from_file ($path);	343	my $img = load_uc $path;
273	Scalar::Util::weaken ($_IMG_CACHE{$path} = $img);	344	Scalar::Util::weaken ($_IMG_CACHE{$path} = $img);
274	$img	345	$img
275	}	346	}
276	}	347	}
277		348
…		…
323		394
324	=item merge $img ...	395	=item merge $img ...
325		396
326	Takes any number of images and merges them together, creating a single	397	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	398	image containing them all. The tiling mode of the first image is used as
328	the tiling mdoe of the resulting image.	399	the tiling mode of the resulting image.
329		400
330	This function is called automatically when an expression returns multiple	401	This function is called automatically when an expression returns multiple
331	images.	402	images.
332		403
333	=cut	404	=cut
…		…
363	for @_;	434	for @_;
364		435
365	$base	436	$base
366	}	437	}
367		438
		439	=back
		440
368	=head2 TILING MODES	441	=head2 TILING MODES
369		442
370	The following operators modify the tiling mode of an image, that is, the	443	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.	444	way that pixels outside the image area are painted when the image is used.
372		445
373	=over 4	446	=over
374		447
375	=item tile $img	448	=item tile $img
376		449
377	Tiles the whole plane with the image and returns this new image - or in	450	Tiles the whole plane with the image and returns this new image - or in
378	other words, it returns a copy of the image in plane tiling mode.	451	other words, it returns a copy of the image in plane tiling mode.
…		…
453	dimensions. They are not (Perl-) variables, they just return stuff that	526	dimensions. They are not (Perl-) variables, they just return stuff that
454	varies. Most of them make your expression sensitive to some events, for	527	varies. Most of them make your expression sensitive to some events, for
455	example using C<TW> (terminal width) means your expression is evaluated	528	example using C<TW> (terminal width) means your expression is evaluated
456	again when the terminal is resized.	529	again when the terminal is resized.
457		530
458	=over 4	531	=over
459		532
460	=item TX	533	=item TX
461		534
462	=item TY	535	=item TY
463		536
464	Return the X and Y coordinates of the terminal window (the terminal	537	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	538	window is the full window by default, and the character area only when in
466	border-respect mode).	539	border-respect mode).
467		540
468	Using these functions make your expression sensitive to window moves.	541	Using these functions makes your expression sensitive to window moves.
469		542
470	These functions are mainly useful to align images to the root window.	543	These functions are mainly useful to align images to the root window.
471		544
472	Example: load an image and align it so it looks as if anchored to the	545	Example: load an image and align it so it looks as if anchored to the
473	background.	546	background (that's exactly what C<rootalign> does btw.):
474		547
475	move -TX, -TY, load "mybg.png"	548	move -TX, -TY, keep { load "mybg.png" }
476		549
477	=item TW	550	=item TW
		551
		552	=item TH
478		553
479	Return the width (C<TW>) and height (C<TH>) of the terminal window (the	554	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	555	terminal window is the full window by default, and the character area only
481	when in border-respect mode).	556	when in border-respect mode).
482		557
483	Using these functions make your expression sensitive to window resizes.	558	Using these functions makes your expression sensitive to window resizes.
484		559
485	These functions are mainly useful to scale images, or to clip images to	560	These functions are mainly useful to scale images, or to clip images to
486	the window size to conserve memory.	561	the window size to conserve memory.
487		562
488	Example: take the screen background, clip it to the window size, blur it a	563	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.	564	bit, align it to the window position and use it as background.
490		565
491	clip move -TX, -TY, once { blur 5, root }	566	clip move -TX, -TY, keep { blur 5, root }
492		567
493	=cut	568	=item FOCUS
494		569
		570	Returns a boolean indicating whether the terminal window has keyboard
		571	focus, in which case it returns true.
		572
		573	Using this function makes your expression sensitive to focus changes.
		574
		575	A common use case is to fade the background image when the terminal loses
		576	focus, often together with the C<-fade> command line option. In fact,
		577	there is a special function for just that use case: C<focus_fade>.
		578
		579	Example: use two entirely different background images, depending on
		580	whether the window has focus.
		581
		582	FOCUS ? keep { load "has_focus.jpg" } : keep { load "no_focus.jpg" }
		583
		584	=cut
		585
495	sub TX() { $frame->[FR_AGAIN]{position} = 1; $x }	586	sub TX () { $frame->[FR_AGAIN]{position} = 1; $x }
496	sub TY() { $frame->[FR_AGAIN]{position} = 1; $y }	587	sub TY () { $frame->[FR_AGAIN]{position} = 1; $y }
497	sub TW() { $frame->[FR_AGAIN]{size} = 1; $w }	588	sub TW () { $frame->[FR_AGAIN]{size} = 1; $w }
498	sub TH() { $frame->[FR_AGAIN]{size} = 1; $h }	589	sub TH () { $frame->[FR_AGAIN]{size} = 1; $h }
		590	sub FOCUS() { $frame->[FR_AGAIN]{focus} = 1; $focus }
499		591
500	=item now	592	=item now
501		593
502	Returns the current time as (fractional) seconds since the epoch.	594	Returns the current time as (fractional) seconds since the epoch.
503		595
…		…
510	C<$seconds> seconds.	602	C<$seconds> seconds.
511		603
512	Example: load some image and rotate it according to the time of day (as if it were	604	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.	605	the hour pointer of a clock). Update this image every minute.
514		606
		607	again 60;
515	again 60; rotate 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"	608	rotate 50, 50, (now % 86400) * -72 / 8640, scale keep { load "myclock.png" }
516		609
517	=item counter $seconds	610	=item counter $seconds
518		611
519	Like C<again>, but also returns an increasing counter value, starting at	612	Like C<again>, but also returns an increasing counter value, starting at
520	0, which might be useful for some simple animation effects.	613	0, which might be useful for some simple animation effects.
…		…
536		629
537	=head2 SHAPE CHANGING OPERATORS	630	=head2 SHAPE CHANGING OPERATORS
538		631
539	The following operators modify the shape, size or position of the image.	632	The following operators modify the shape, size or position of the image.
540		633
541	=over 4	634	=over
542		635
543	=item clip $img	636	=item clip $img
544		637
545	=item clip $width, $height, $img	638	=item clip $width, $height, $img
546		639
…		…
549	Clips an image to the given rectangle. If the rectangle is outside the	642	Clips an image to the given rectangle. If the rectangle is outside the
550	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is	643	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is
551	larger than the image, then the tiling mode defines how the extra pixels	644	larger than the image, then the tiling mode defines how the extra pixels
552	will be filled.	645	will be filled.
553		646
554	If C<$x> an C<$y> are missing, then C<0> is assumed for both.	647	If C<$x> and C<$y> are missing, then C<0> is assumed for both.
555		648
556	If C<$width> and C<$height> are missing, then the window size will be	649	If C<$width> and C<$height> are missing, then the window size will be
557	assumed.	650	assumed.
558		651
559	Example: load an image, blur it, and clip it to the window size to save	652	Example: load an image, blur it, and clip it to the window size to save
560	memory.	653	memory.
561		654
562	clip blur 10, load "mybg.png"	655	clip keep { blur 10, load "mybg.png" }
563		656
564	=cut	657	=cut
565		658
566	sub clip($;$$;$$) {	659	sub clip($;$$;$$) {
567	my $img = pop;	660	my $img = pop;
…		…
577	=item scale $width_factor, $height_factor, $img	670	=item scale $width_factor, $height_factor, $img
578		671
579	Scales the image by the given factors in horizontal	672	Scales the image by the given factors in horizontal
580	(C<$width>) and vertical (C<$height>) direction.	673	(C<$width>) and vertical (C<$height>) direction.
581		674
582	If only one factor is give, it is used for both directions.	675	If only one factor is given, it is used for both directions.
583		676
584	If no factors are given, scales the image to the window size without	677	If no factors are given, scales the image to the window size without
585	keeping aspect.	678	keeping aspect.
586		679
587	=item resize $width, $height, $img	680	=item resize $width, $height, $img
…		…
661	the terminal window (or the box specified by C<$width> and C<$height> if	754	the terminal window (or the box specified by C<$width> and C<$height> if
662	given).	755	given).
663		756
664	Example: load an image and center it.	757	Example: load an image and center it.
665		758
666	center pad load "mybg.png"	759	center keep { pad load "mybg.png" }
667		760
668	=item rootalign $img	761	=item rootalign $img
669		762
670	Moves the image so that it appears glued to the screen as opposed to the	763	Moves the image so that it appears glued to the screen as opposed to the
671	window. This gives the illusion of a larger area behind the window. It is	764	window. This gives the illusion of a larger area behind the window. It is
672	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the	765	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the
673	top left of the screen.	766	top left of the screen.
674		767
675	Example: load a background image, put it in mirror mode and root align it.	768	Example: load a background image, put it in mirror mode and root align it.
676		769
677	rootalign mirror load "mybg.png"	770	rootalign keep { mirror load "mybg.png" }
678		771
679	Example: take the screen background and align it, giving the illusion of	772	Example: take the screen background and align it, giving the illusion of
680	transparency as long as the window isn't in front of other windows.	773	transparency as long as the window isn't in front of other windows.
681		774
682	rootalign root	775	rootalign root
…		…
707		800
708	sub rootalign($) {	801	sub rootalign($) {
709	move -TX, -TY, $_[0]	802	move -TX, -TY, $_[0]
710	}	803	}
711		804
712	=item rotate $center_x, $center_y, $degrees	805	=item rotate $center_x, $center_y, $degrees, $img
713		806
714	Rotates the image by C<$degrees> degrees, counter-clockwise, around the	807	Rotates the image clockwise by C<$degrees> degrees, around the point at
715	pointer at C<$center_x> and C<$center_y> (specified as factor of image	808	C<$center_x> and C<$center_y> (specified as factor of image width/height).
716	width/height).
717		809
718	#TODO# new width, height, maybe more operators?
719
720	Example: rotate the image by 90 degrees	810	Example: rotate the image by 90 degrees around its center.
		811
		812	rotate 0.5, 0.5, 90, keep { load "$HOME/mybg.png" }
721		813
722	=cut	814	=cut
723		815
724	sub rotate($$$$) {	816	sub rotate($$$$) {
725	my $img = pop;	817	my $img = pop;
…		…
734		826
735	=head2 COLOUR MODIFICATIONS	827	=head2 COLOUR MODIFICATIONS
736		828
737	The following operators change the pixels of the image.	829	The following operators change the pixels of the image.
738		830
739	=over 4	831	=over
		832
		833	=item tint $color, $img
		834
		835	Tints the image in the given colour.
		836
		837	Example: tint the image red.
		838
		839	tint "red", load "rgb.png"
		840
		841	Example: the same, but specify the colour by component.
		842
		843	tint [1, 0, 0], load "rgb.png"
		844
		845	=cut
		846
		847	sub tint($$) {
		848	$_[1]->tint ($_[0])
		849	}
		850
		851	=item shade $factor, $img
		852
		853	Shade the image by the given factor.
		854
		855	=cut
		856
		857	sub shade($$) {
		858	$_[1]->shade ($_[0])
		859	}
740		860
741	=item contrast $factor, $img	861	=item contrast $factor, $img
742		862
743	=item contrast $r, $g, $b, $img	863	=item contrast $r, $g, $b, $img
744		864
…		…
774	latter in a white picture.	894	latter in a white picture.
775		895
776	Due to idiosyncrasies in the underlying XRender extension, biases less	896	Due to idiosyncrasies in the underlying XRender extension, biases less
777	than zero can be I<very> slow.	897	than zero can be I<very> slow.
778		898
		899	You can also try the experimental(!) C<muladd> operator.
		900
779	=cut	901	=cut
780		902
781	sub contrast($$;$$;$) {	903	sub contrast($$;$$;$) {
782	my $img = pop;	904	my $img = pop;
783	my ($r, $g, $b, $a) = @_;	905	my ($r, $g, $b, $a) = @_;
…		…
798	$a = 1 if @_ < 4;	920	$a = 1 if @_ < 4;
799		921
800	$img = $img->clone;	922	$img = $img->clone;
801	$img->brightness ($r, $g, $b, $a);	923	$img->brightness ($r, $g, $b, $a);
802	$img	924	$img
		925	}
		926
		927	=item muladd $mul, $add, $img # EXPERIMENTAL
		928
		929	First multiplies the pixels by C<$mul>, then adds C<$add>. This can be used
		930	to implement brightness and contrast at the same time, with a wider value
		931	range than contrast and brightness operators.
		932
		933	Due to numerous bugs in XRender implementations, it can also introduce a
		934	number of visual artifacts.
		935
		936	Example: increase contrast by a factor of C<$c> without changing image
		937	brightness too much.
		938
		939	muladd $c, (1 - $c) * 0.5, $img
		940
		941	=cut
		942
		943	sub muladd($$$) {
		944	$_[2]->muladd ($_[0], $_[1])
803	}	945	}
804		946
805	=item blur $radius, $img	947	=item blur $radius, $img
806		948
807	=item blur $radius_horz, $radius_vert, $img	949	=item blur $radius_horz, $radius_vert, $img
…		…
819	sub blur($$;$) {	961	sub blur($$;$) {
820	my $img = pop;	962	my $img = pop;
821	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])	963	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
822	}	964	}
823		965
		966	=item focus_fade $img
		967
		968	=item focus_fade $factor, $img
		969
		970	=item focus_fade $factor, $color, $img
		971
		972	Fades the image by the given factor (and colour) when focus is lost (the
		973	same as the C<-fade>/C<-fadecolor> command line options, which also supply
		974	the default values for C<factor> and C<$color>. Unlike with C<-fade>, the
		975	C<$factor> is a real value, not a percentage value (that is, 0..1, not
		976	0..100).
		977
		978	Example: do the right thing when focus fading is requested.
		979
		980	focus_fade load "mybg.jpg";
		981
		982	=cut
		983
		984	sub focus_fade($;$$) {
		985	my $img = pop;
		986
		987	return $img
		988	if FOCUS;
		989
		990	my $fade = @_ >= 1 ? $_[0] : defined $self->resource ("fade") ? $self->resource ("fade") * 0.01 : 0;
		991	my $color = @_ >= 2 ? $_[1] : $self->resource ("color+" . urxvt::Color_fade);
		992
		993	$img = $img->tint ($color) if $color ne "rgb:00/00/00";
		994	$img = $img->muladd (1 - $fade, 0) if $fade;
		995
		996	$img
		997	}
		998
824	=back	999	=back
825		1000
826	=head2 OTHER STUFF	1001	=head2 OTHER STUFF
827		1002
828	Anything that didn't fit any of the other categories, even after applying	1003	Anything that didn't fit any of the other categories, even after applying
829	force and closing our eyes.	1004	force and closing our eyes.
830		1005
831	=over 4	1006	=over
832		1007
833	=item once { ... }	1008	=item keep { ... }
834		1009
835	This function takes a code block as argument, that is, one or more	1010	This operator takes a code block as argument, that is, one or more
836	statements enclosed by braces.	1011	statements enclosed by braces.
837		1012
838	The trick is that this code block is only evaluated once - future calls	1013	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	1014	changes - on other calls the C<keep> simply returns the image it computed
840	images).	1015	previously (yes, it should only be used with images). Or in other words,
		1016	C<keep> I<caches> the result of the code block so it doesn't need to be
		1017	computed again.
841		1018
842	This can be extremely useful to avoid redoing the same slow operations	1019	This can be extremely useful to avoid redoing slow operations - for
843	again and again- for example, if your background expression takes the root	1020	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	1021	and then root-aligns it it would have to blur the root background on every
845	root background on every window move or resize.	1022	window move or resize.
		1023
		1024	Another example is C<load>, which can be quite slow.
846		1025
847	In fact, urxvt itself encloses the whole expression in some kind of	1026	In fact, urxvt itself encloses the whole expression in some kind of
848	C<once> block so it only is reevaluated as required.	1027	C<keep> block so it only is reevaluated as required.
849		1028
850	Putting the blur into a C<once> block will make sure the blur is only done	1029	Putting the blur into a C<keep> block will make sure the blur is only done
851	once:	1030	once, while the C<rootalign> is still done each time the window moves.
852		1031
853	rootlign once { blur 10, root }	1032	rootalign keep { blur 10, root }
854		1033
855	This leaves the question of how to force reevaluation of the block,	1034	This leaves the question of how to force reevaluation of the block,
856	in case the root background changes: If expression inside the block	1035	in case the root background changes: If expression inside the block
857	is sensitive to some event (root background changes, window geometry	1036	is sensitive to some event (root background changes, window geometry
858	changes), then it will be reevaluated automatically as needed.	1037	changes), then it will be reevaluated automatically as needed.
859		1038
860	=item once_again	1039	=back
861		1040
862	Resets all C<once> block as if they had never been called, i.e. on the	1041	=head1 OLD BACKGROUND IMAGE SETTINGS
863	next call they will be reevaluated again.
864		1042
865	=cut	1043	This extension also provides support for the old options/resources and
		1044	OSC sequences for setting a background image. These settings are
		1045	B<deprecated> and will be removed in future versions.
866		1046
		1047	=head2 OPTIONS AND RESOURCES
		1048
		1049	=over
		1050
		1051	=item B<-pixmap> I<file[;oplist]>
		1052
		1053	=item B<backgroundPixmap:> I<file[;oplist]>
		1054
		1055	Use the specified image file as the window's background and also
		1056	optionally specify a colon separated list of operations to modify it.
		1057	Note that you may need to quote the C<;> character when using the
		1058	command line option, as C<;> is usually a metacharacter in shells.
		1059	Supported operations are:
		1060
		1061	=over
		1062
		1063	=item B<WxH+X+Y>
		1064
		1065	sets scale and position. B<"W" / "H"> specify the horizontal/vertical
		1066	scale (percent), and B<"X" / "Y"> locate the image centre (percent). A
		1067	scale of 0 disables scaling.
		1068
		1069	=item B<op=tile>
		1070
		1071	enables tiling
		1072
		1073	=item B<op=keep-aspect>
		1074
		1075	maintain the image aspect ratio when scaling
		1076
		1077	=item B<op=root-align>
		1078
		1079	use the position of the terminal window relative to the root window as
		1080	the image offset, simulating a root window background
		1081
		1082	=back
		1083
		1084	The default scale and position setting is C<100x100+50+50>.
		1085	Alternatively, a predefined set of templates can be used to achieve
		1086	the most common setups:
		1087
		1088	=over
		1089
		1090	=item B<style=tiled>
		1091
		1092	the image is tiled with no scaling. Equivalent to 0x0+0+0:op=tile
		1093
		1094	=item B<style=aspect-stretched>
		1095
		1096	the image is scaled to fill the whole window maintaining the aspect
		1097	ratio and centered. Equivalent to 100x100+50+50:op=keep-aspect
		1098
		1099	=item B<style=stretched>
		1100
		1101	the image is scaled to fill the whole window. Equivalent to 100x100
		1102
		1103	=item B<style=centered>
		1104
		1105	the image is centered with no scaling. Equivalent to 0x0+50+50
		1106
		1107	=item B<style=root-tiled>
		1108
		1109	the image is tiled with no scaling and using 'root' positioning.
		1110	Equivalent to 0x0:op=tile:op=root-align
		1111
		1112	=back
		1113
		1114	If multiple templates are specified the last one wins. Note that a
		1115	template overrides all the scale, position and operations settings.
		1116
		1117	If used in conjunction with pseudo-transparency, the specified image
		1118	will be blended over the transparent background using alpha-blending.
		1119
		1120	=item B<-tr>\|B<+tr>
		1121
		1122	=item B<transparent:> I<boolean>
		1123
		1124	Turn on/off pseudo-transparency by using the root pixmap as background.
		1125
		1126	=item B<-tint> I<colour>
		1127
		1128	=item B<tintColor:> I<colour>
		1129
		1130	Tint the transparent background with the given colour. Note that a
		1131	black tint yields a completely black image while a white tint yields
		1132	the image unchanged.
		1133
		1134	=item B<-sh> I<number>
		1135
		1136	=item B<shading:> I<number>
		1137
		1138	Darken (0 .. 99) or lighten (101 .. 200) the transparent background.
		1139	A value of 100 means no shading.
		1140
		1141	=item B<-blr> I<HxV>
		1142
		1143	=item B<blurRadius:> I<HxV>
		1144
		1145	Apply gaussian blur with the specified radius to the transparent
		1146	background. If a single number is specified, the vertical and
		1147	horizontal radii are considered to be the same. Setting one of the
		1148	radii to 1 and the other to a large number creates interesting effects
		1149	on some backgrounds. The maximum radius value is 128. An horizontal or
		1150	vertical radius of 0 disables blurring.
		1151
		1152	=back
		1153
		1154	=head2 OSC sequences
		1155
		1156	This extension will react to the following OSC sequences. Note that
		1157	this extension will not be autoloaded when these are used currently,
		1158	so to make urxvt recognize them, you have to enable the C<background>
		1159	extension. One way to achieve that is to use the C<--background-expr ''>
		1160	command line argument or by specifying an empty C<URxvt.background.expr:>>
		1161	resource.
		1162
		1163	=over
		1164
		1165	=item B<< C<ESC ] 705 ; Pt ST> >> Change transparent background tint colour to B<< C<Pt> >>.
		1166
		1167	=item B<< C<ESC ] 20 ; Pt ST> >> Change/Query background image
		1168	parameters: the value of B<< C<Pt> >> can be one of the following
		1169	commands:
		1170
		1171	=over
		1172
		1173	=item B<< C<?> >>
		1174
		1175	display scale and position in the title
		1176
		1177	=item B<< C<;WxH+X+Y> >>
		1178
		1179	change scale and/or position
		1180
		1181	=item B<< C<FILE;WxH+X+Y> >>
		1182
		1183	change background image
		1184
		1185	=back
		1186
		1187	=cut
		1188
867	sub once(&) {	1189	sub keep(&) {
868	my $id = $_[0]+0;	1190	my $id = $_[0]+0;
869		1191
870	local $frame = $self->{frame_cache}{$id} \|\|= [$frame];	1192	local $frame = $self->{frame_cache}{$id} \|\|= [$frame];
871		1193
872	unless ($frame->[FR_CACHE]) {	1194	unless ($frame->[FR_CACHE]) {
…		…
879	# clear this frame cache, also for all parents	1201	# clear this frame cache, also for all parents
880	for (my $frame = $frame; $frame; $frame = $frame->[0]) {	1202	for (my $frame = $frame; $frame; $frame = $frame->[0]) {
881	undef $frame->[FR_CACHE];	1203	undef $frame->[FR_CACHE];
882	}	1204	}
883		1205
884	unless ($self->{term}) {
885	use Data::Dump;
886	ddx $frame;
887	exit;
888	}
889
890	$self->recalculate;	1206	$self->recalculate;
891	});	1207	});
892	};	1208	};
893		1209
894	# in scalar context we always return the first original result, which	1210	# in scalar context we always return the first original result, which
…		…
896	wantarray	1212	wantarray
897	? @{ $frame->[FR_CACHE] }	1213	? @{ $frame->[FR_CACHE] }
898	: $frame->[FR_CACHE][0]	1214	: $frame->[FR_CACHE][0]
899	}	1215	}
900		1216
901	sub once_again() {	1217	# sub keep_clear() {
902	delete $self->{frame_cache};	1218	# delete $self->{frame_cache};
903	}	1219	# }
904		1220
905	=back	1221	=back
906		1222
907	=cut	1223	=cut
908		1224
909	}	1225	}
910		1226
911	sub parse_expr {	1227	sub parse_expr {
		1228	my ($expr) = @_;
		1229
		1230	# an empty expression is valid and represents the default background
		1231	if ($expr !~ /\S/) {
		1232	$expr = sub {
		1233	undef
		1234	};
		1235	} else {
912	my $expr = eval	1236	$expr = eval
913	"sub {\n"	1237	"sub {\n"
914	. "package urxvt::bgdsl;\n"	1238	. "package urxvt::bgdsl;\n"
915	. "#line 0 'background expression'\n"	1239	. "#line 0 'background expression'\n"
916	. "$_[0]\n"	1240	. "$expr\n"
917	. "}";	1241	. "}";
918	die if $@;	1242	die if $@;
		1243	}
		1244
919	$expr	1245	$expr
920	}	1246	}
921		1247
922	# compiles a parsed expression	1248	# compiles a parsed expression
923	sub set_expr {	1249	sub set_expr {
924	my ($self, $expr) = @_;	1250	my ($self, $expr) = @_;
925		1251
926	$self->{root} = [];	1252	$self->{root} = []; # the outermost frame
927	$self->{expr} = $expr;	1253	$self->{expr} = $expr;
928	$self->recalculate;	1254	$self->recalculate;
929	}	1255	}
930		1256
931	# takes a hash of sensitivity indicators and installs watchers	1257	# takes a hash of sensitivity indicators and installs watchers
…		…
972	if ($again->{rootpmap}) {	1298	if ($again->{rootpmap}) {
973	$state->{rootpmap} = $self->on (rootpmap_change => $cb);	1299	$state->{rootpmap} = $self->on (rootpmap_change => $cb);
974	} else {	1300	} else {
975	delete $state->{rootpmap};	1301	delete $state->{rootpmap};
976	}	1302	}
		1303
		1304	if ($again->{focus}) {
		1305	$state->{focus} = $self->on (focus_in => $cb, focus_out => $cb);
		1306	} else {
		1307	delete $state->{focus};
		1308	}
977	}	1309	}
978		1310
979	# evaluate the current bg expression	1311	# evaluate the current bg expression
980	sub recalculate {	1312	sub recalculate {
981	my ($arg_self) = @_;	1313	my ($arg_self) = @_;
…		…
989	return;	1321	return;
990	}	1322	}
991		1323
992	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;	1324	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;
993		1325
		1326	unless ($arg_self->has_render) {
		1327	warn "background extension needs RENDER extension 0.11 or higher, ignoring background-expr.\n";
		1328	return;
		1329	}
		1330
994	# set environment to evaluate user expression	1331	# set environment to evaluate user expression
995		1332
996	local $self = $arg_self;	1333	local $self = $arg_self;
997	local $HOME = $ENV{HOME};	1334	local $HOME = $ENV{HOME};
998	local $frame = [];	1335	local $frame = $self->{root};
999		1336
1000	($x, $y, $w, $h) = $self->background_geometry ($self->{border});	1337	($x, $y, $w, $h) = $self->background_geometry ($self->{border});
		1338	$focus = $self->focus;
1001		1339
1002	# evaluate user expression	1340	# evaluate user expression
1003		1341
1004	my @img = eval { $self->{expr}->() };	1342	my @img = eval { $self->{expr}->() };
1005	die $@ if $@;	1343	die $@ if $@;
1006	die "background-expr did not return anything.\n" unless @img;	1344	die "background-expr did not return anything.\n" unless @img;
		1345
		1346	if ($img[0]) {
1007	die "background-expr: expected image(s), got something else.\n"	1347	die "background-expr: expected image(s), got something else.\n"
1008	if grep { !UNIVERSAL::isa $_, "urxvt::img" } @img;	1348	if grep { !UNIVERSAL::isa $_, "urxvt::img" } @img;
1009		1349
1010	my $img = urxvt::bgdsl::merge @img;	1350	my $img = urxvt::bgdsl::merge @img;
1011		1351
1012	$frame->[FR_AGAIN]{size} = 1	1352	$frame->[urxvt::bgdsl::FR_AGAIN]{size} = 1
1013	if $img->repeat_mode != urxvt::RepeatNormal;	1353	if $img->repeat_mode != urxvt::RepeatNormal;
1014		1354
1015	# if the expression is sensitive to external events, prepare reevaluation then	1355	# if the expression is sensitive to external events, prepare reevaluation then
1016	$self->compile_frame ($frame, sub { $arg_self->recalculate });	1356	$self->compile_frame ($frame, sub { $arg_self->recalculate });
1017		1357
1018	# clear stuff we no longer need	1358	# clear stuff we no longer need
1019		1359
1020	# unless (%{ $frame->[FR_STATE] }) {	1360	# unless (%{ $frame->[FR_STATE] }) {
1021	# delete $self->{state};	1361	# delete $self->{state};
1022	# delete $self->{expr};	1362	# delete $self->{expr};
1023	# }	1363	# }
1024		1364
1025	# set background pixmap	1365	# set background pixmap
1026		1366
1027	$self->set_background ($img, $self->{border});	1367	$self->set_background ($img, $self->{border});
		1368	} else {
		1369	$self->clr_background;
		1370	}
		1371
1028	$self->scr_recolour (0);	1372	$self->scr_recolor (0);
1029	$self->want_refresh;	1373	$self->want_refresh;
1030	}	1374	}
1031		1375
		1376	sub old_bg_opts {
		1377	my ($self, $arg) = @_;
		1378
		1379	$arg or return;
		1380
		1381	my @str = split /;/, $arg;
		1382
		1383	return unless $str[0] or $self->{bg_opts}->{path};
		1384
		1385	my $bg_opts = $self->{bg_opts};
		1386
		1387	if ($str[0]) {
		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} = 100;
		1392	$bg_opts->{h_align} = $bg_opts->{v_align} = 50;
		1393	$bg_opts->{path} = $str[0];
		1394	}
		1395
		1396	my @oplist = split /:/, $str[1];
		1397
		1398	for (@oplist) {
		1399	if (/style=tiled/i) {
		1400	$bg_opts->{tile} = 1;
		1401	$bg_opts->{keep_aspect} = 0;
		1402	$bg_opts->{root_align} = 0;
		1403	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 0;
		1404	$bg_opts->{h_align} = $bg_opts->{v_align} = 0;
		1405	} elsif (/style=aspect-stretched/i) {
		1406	$bg_opts->{tile} = 0;
		1407	$bg_opts->{keep_aspect} = 1;
		1408	$bg_opts->{root_align} = 0;
		1409	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 100;
		1410	$bg_opts->{h_align} = $bg_opts->{v_align} = 50;
		1411	} elsif (/style=stretched/i) {
		1412	$bg_opts->{tile} = 0;
		1413	$bg_opts->{keep_aspect} = 0;
		1414	$bg_opts->{root_align} = 0;
		1415	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 100;
		1416	$bg_opts->{h_align} = $bg_opts->{v_align} = 50;
		1417	} elsif (/style=centered/i) {
		1418	$bg_opts->{tile} = 0;
		1419	$bg_opts->{keep_aspect} = 0;
		1420	$bg_opts->{root_align} = 0;
		1421	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 0;
		1422	$bg_opts->{h_align} = $bg_opts->{v_align} = 50;
		1423	} elsif (/style=root-tiled/i) {
		1424	$bg_opts->{tile} = 1;
		1425	$bg_opts->{keep_aspect} = 0;
		1426	$bg_opts->{root_align} = 1;
		1427	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 0;
		1428	$bg_opts->{h_align} = $bg_opts->{v_align} = 0;
		1429	} elsif (/op=tile/i) {
		1430	$bg_opts->{tile} = 1;
		1431	} elsif (/op=keep-aspect/i) {
		1432	$bg_opts->{keep_aspect} = 1;
		1433	} elsif (/op=root-align/i) {
		1434	$bg_opts->{root_align} = 1;
		1435	} elsif (/^ =? ([0-9]+)? (?:[xX] ([0-9]+))? ([+-][0-9]+)? ([+-][0-9]+)? $/x) {
		1436	my ($w, $h, $x, $y) = ($1, $2, $3, $4);
		1437
		1438	if ($str[0]) {
		1439	$w = $h unless defined $w;
		1440	$h = $w unless defined $h;
		1441	$y = $x unless defined $y;
		1442	}
		1443
		1444	$bg_opts->{h_scale} = $w if defined $w;
		1445	$bg_opts->{v_scale} = $h if defined $h;
		1446	$bg_opts->{h_align} = $x if defined $x;
		1447	$bg_opts->{v_align} = $y if defined $y;
		1448	}
		1449	}
		1450	}
		1451
		1452	# helper function, quote string as perl without allowing
		1453	# any code execution or other shenanigans. does not
		1454	# support binary NULs in string.
		1455	sub q0 {
		1456	(my $str = shift) =~ s/\x00//g; # make sure there really aren't any embedded NULs
		1457	"q\x00$str\x00"
		1458	}
		1459
		1460	sub old_bg_expr {
		1461	my ($self) = @_;
		1462
		1463	my $expr;
		1464
		1465	my $bg_opts = $self->{bg_opts};
		1466
		1467	if ($bg_opts->{root} =~ /^\s(?:true\|yes\|on\|1)\s$/i) {
		1468	$expr .= "tile (";
		1469
		1470	my $shade = $bg_opts->{shade};
		1471
		1472	if ($shade) {
		1473	$shade = List::Util::min $shade, 200;
		1474	$shade = List::Util::max $shade, -100;
		1475	$shade = 200 - (100 + $shade) if $shade < 0;
		1476
		1477	$shade = $shade * 0.01 - 1;
		1478	$expr .= "shade $shade, ";
		1479	}
		1480
		1481	my $tint = $bg_opts->{tint};
		1482
		1483	if ($tint) {
		1484	$tint = q0 $tint;
		1485	$expr .= "tint $tint,";
		1486	}
		1487
		1488	my $blur = $bg_opts->{blur};
		1489
		1490	if ($blur and $blur =~ /^ =? ([0-9]+)? (?:[xX] ([0-9]+))? $/x) {
		1491	my $hr = defined $1 ? $1 : 1;
		1492	my $vr = defined $2 ? $2 : $hr;
		1493
		1494	if ($hr != 0 and $vr != 0) {
		1495	$expr .= "blur $hr, $vr, ";
		1496	}
		1497	}
		1498
		1499	$expr .= "rootalign root)";
		1500	}
		1501
		1502	if ($bg_opts->{path}) {
		1503	my $file_expr;
		1504	my $h_scale = $bg_opts->{h_scale} * 0.01;
		1505	my $v_scale = $bg_opts->{v_scale} * 0.01;
		1506	my $h_align = $bg_opts->{h_align} * 0.01;
		1507	my $v_align = $bg_opts->{v_align} * 0.01;
		1508
		1509	if (!$bg_opts->{tile}) {
		1510	$file_expr .= "pad (";
		1511	} else {
		1512	$file_expr .= "tile (";
		1513	}
		1514
		1515	if ($bg_opts->{root_align}) {
		1516	$file_expr .= "rootalign ";
		1517	} else {
		1518	$file_expr .= "align $h_align, $v_align, ";
		1519	}
		1520
		1521	if ($h_scale != 0 and $v_scale != 0) {
		1522	my $op = $bg_opts->{keep_aspect} ? "fit" : "resize";
		1523	$file_expr .= "$op TW * $h_scale, TH * $v_scale, ";
		1524	}
		1525
		1526	my $path = q0 $bg_opts->{path};
		1527
		1528	$file_expr .= "keep { load $path })";
		1529
		1530	if ($expr) {
		1531	$expr .= ", tint (\"[50]white\", $file_expr)";
		1532	} else {
		1533	$expr = $file_expr;
		1534	}
		1535	}
		1536
		1537	$expr
		1538	}
		1539
		1540	sub find_resource {
		1541	my ($self, $res, $opt) = @_;
		1542
		1543	my $v = $self->x_resource ($opt);
		1544	$v = $self->x_resource ($res) unless defined $v;
		1545
		1546	$v
		1547	}
		1548
		1549	sub parse_bgopts {
		1550	my ($self) = @_;
		1551
		1552	my $expr = $self->x_resource ("%.expr");
		1553
		1554	if (!$expr) {
		1555	$self->{bg_opts} = { h_scale => 100, v_scale => 100,
		1556	h_align => 50, v_align => 50 };
		1557
		1558	$self->{bg_opts}{shade} = $self->find_resource ("shading", "sh");
		1559	$self->{bg_opts}{tint} = $self->find_resource ("tintColor", "tint");
		1560	$self->{bg_opts}{blur} = $self->find_resource ("blurRadius", "blr");
		1561	$self->{bg_opts}{root} = $self->find_resource ("transparent", "tr");
		1562
		1563	$self->old_bg_opts ($self->find_resource ("backgroundPixmap", "pixmap"));
		1564	$expr = $self->old_bg_expr;
		1565	}
		1566
		1567	$self->set_expr (parse_expr $expr);
		1568	$self->{border} = $self->x_resource_boolean ("%.border");
		1569
		1570	$MIN_INTERVAL = $self->x_resource ("%.interval");
		1571	}
		1572
1032	sub on_start {	1573	sub on_start {
1033	my ($self) = @_;	1574	my ($self) = @_;
1034		1575
1035	my $expr = $self->x_resource ("%.expr")	1576	$self->parse_bgopts;
1036	or return;
1037
1038	$self->has_render
1039	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";
1040
1041	$self->set_expr (parse_expr $expr);
1042	$self->{border} = $self->x_resource_boolean ("%.border");
1043
1044	$MIN_INTERVAL = $self->x_resource ("%.interval");
1045		1577
1046	()	1578	()
1047	}	1579	}
1048		1580
		1581	sub on_osc_seq {
		1582	my ($self, $op, $arg) = @_;
		1583
		1584	$op eq "20" or $op eq "706"
		1585	or return;
		1586
		1587	$self->{bg_opts}
		1588	or $self->parse_bgopts;
		1589
		1590	if ($op eq "20") {
		1591	if ($arg eq "?") {
		1592	my $h_scale = $self->{bg_opts}{h_scale};
		1593	my $v_scale = $self->{bg_opts}{v_scale};
		1594	my $h_align = $self->{bg_opts}{h_align};
		1595	my $v_align = $self->{bg_opts}{v_align};
		1596	$self->cmd_parse ("\033]2;[${h_scale}x${v_scale}+${h_align}+${v_align}]\007");
		1597	} else {
		1598	$self->old_bg_opts ($arg);
		1599	my $expr = $self->old_bg_expr;
		1600	$self->set_expr (parse_expr $expr) if $expr;
		1601	}
		1602	} elsif ($op eq "705") {
		1603	$self->{bg_opts}{tint} = $arg;
		1604	my $expr = $self->old_bg_expr;
		1605	$self->set_expr (parse_expr $expr) if $expr;
		1606	}
		1607
		1608	1
		1609	}
		1610

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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 1.103 by root, Fri Nov 26 18:49:48 2021 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 1.103 by root, Fri Nov 26 18:49:48 2021 UTC