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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.70 by root, Mon Jul 2 01:35:37 2012 UTC vs.
Revision 1.110 by sf-exg, Tue Dec 6 09:02:19 2022 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
22	It does so by evaluating a Perl expression that I<calculates> the image on	58	It does so by evaluating a Perl expression that I<calculates> the image on
23	the fly, for example, by grabbing the root background or loading a file.	59	the fly, for example, by grabbing the root background or loading a file.
24		60
25	While the full power of Perl is available, the operators have been design	61	While the full power of Perl is available, the operators have been
26	to be as simple as possible.	62	designed 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 keep { 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 keep { 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
74	return load "$HOME/sunday.png";	110	return load "$HOME/sunday.png";
75	}	111	}
76	}	112	}
77		113
78	This inner expression is evaluated once per hour (and whenever the	114	This inner expression is evaluated once per hour (and whenever the
79	temrinal window is resized). It sets F<sunday.png> as background on	115	terminal window is resized). It sets F<sunday.png> as background on
80	Sundays, and F<weekday.png> on all other days.	116	Sundays, and F<weekday.png> on all other days.
81		117
82	Fortunately, we expect that most expressions will be much simpler, with	118	Fortunately, we expect that most expressions will be much simpler, with
83	little Perl knowledge needed.	119	little Perl knowledge needed.
84		120
…		…
108	get a percentage):	144	get a percentage):
109		145
110	scale 2, load "$HOME/mypic.png"	146	scale 2, load "$HOME/mypic.png"
111		147
112	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>
113	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
114	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
115	commas.	151	commas.
116		152
117	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
118	horizontal and vertical dimensions. For example, this halves the image	154	horizontal and vertical dimensions. For example, this halves the image
119	width and doubles the image height:	155	width and doubles the image height:
120		156
121	scale 0.5, 2, load "$HOME/mypic.png"	157	scale 0.5, 2, load "$HOME/mypic.png"
122		158
123	IF you try out these expressions, you might suffer from some sluggishness,	159	IF you try out these expressions, you might suffer from some sluggishness,
124	because each time the terminal is resized, it loads the PNG image agin	160	because each time the terminal is resized, it loads the PNG image again
125	and scales it. Scaling is usually fast (and unavoidable), but loading the	161	and scales it. Scaling is usually fast (and unavoidable), but loading the
126	image can be quite time consuming. This is where C<keep> comes in handy:	162	image can be quite time consuming. This is where C<keep> comes in handy:
127		163
128	scale 0.5, 2, keep { load "$HOME/mypic.png" }	164	scale 0.5, 2, keep { load "$HOME/mypic.png" }
129		165
…		…
156		192
157	This one 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
158	moves it to the upper left corner of the screen (as opposed to the upper	194	moves it to the upper left corner of the screen (as opposed to the upper
159	left corner of the terminal window)- the result is pseudo-transparency:	195	left corner of the terminal window)- the result is pseudo-transparency:
160	the image seems to be static while the window is moved around.	196	the image seems to be static while the window is moved around.
		197
		198	=head2 COLOUR SPECIFICATIONS
		199
		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:
		202
		203	"red" # named colour
		204	"#f00" # simple rgb
		205	"[50]red" # red with 50% alpha
		206	"TekHVC:300/50/50" # anything goes
		207
		208	OR as an array reference with one, three or four components:
		209
		210	[0.5] # 50% gray, 100% alpha
		211	[0.5, 0, 0] # dark red, no green or blur, 100% alpha
		212	[0.5, 0, 0, 0.7] # same with explicit 70% alpha
161		213
162	=head2 CACHING AND SENSITIVITY	214	=head2 CACHING AND SENSITIVITY
163		215
164	Since some operations (such as C<load> and C<blur>) can take a long time,	216	Since some operations (such as C<load> and C<blur>) can take a long time,
165	caching results can be very important for a smooth operation. Caching can	217	caching results can be very important for a smooth operation. Caching can
…		…
209		261
210	=head1 REFERENCE	262	=head1 REFERENCE
211		263
212	=head2 COMMAND LINE SWITCHES	264	=head2 COMMAND LINE SWITCHES
213		265
214	=over 4	266	=over
215		267
216	=item --background-expr perl-expression	268	=item --background-expr perl-expression
217		269
218	Specifies the Perl expression to evaluate.	270	Specifies the Perl expression to evaluate.
219		271
…		…
239	=cut	291	=cut
240		292
241	our %_IMG_CACHE;	293	our %_IMG_CACHE;
242	our $HOME;	294	our $HOME;
243	our ($self, $frame);	295	our ($self, $frame);
244	our ($x, $y, $w, $h);	296	our ($x, $y, $w, $h, $focus);
245		297
246	# enforce at least this interval between updates	298	# enforce at least this interval between updates
247	our $MIN_INTERVAL = 6/59.951;	299	our $MIN_INTERVAL = 6/59.951;
248		300
249	{	301	{
…		…
260		312
261	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
262	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
263	points to get an image you can play with.	315	points to get an image you can play with.
264		316
265	=over 4	317	=over
266		318
267	=item load $path	319	=item load $path
268		320
269	Loads the image at the given C<$path>. The image is set to plane tiling	321	Loads the image at the given C<$path>. The image is set to plane tiling
270	mode.	322	mode.
271		323
272	If the image is already in memory (e.g. because another terminal instance	324	If the image is already in memory (e.g. because another terminal instance
273	uses it), then the in-memory copy us returned instead.	325	uses it), then the in-memory copy is returned instead.
274		326
275	=item load_uc $path	327	=item load_uc $path
276		328
277	Load uncached - same as load, but does not cache the image, which means it	329	Load uncached - same as load, but does not cache the image, which means it
278	is I<always> loaded from the filesystem again.	330	is I<always> loaded from the filesystem again, even if another copy of it
		331	is in memory at the time.
279		332
280	=cut	333	=cut
		334
		335	sub load_uc($) {
		336	$self->new_img_from_file ($_[0])
		337	}
281		338
282	sub load($) {	339	sub load($) {
283	my ($path) = @_;	340	my ($path) = @_;
284		341
285	$_IMG_CACHE{$path} \|\| do {	342	$_IMG_CACHE{$path} \|\| do {
286	my $img = $self->new_img_from_file ($path);	343	my $img = load_uc $path;
287	Scalar::Util::weaken ($_IMG_CACHE{$path} = $img);	344	Scalar::Util::weaken ($_IMG_CACHE{$path} = $img);
288	$img	345	$img
289	}	346	}
290	}	347	}
291		348
…		…
377	for @_;	434	for @_;
378		435
379	$base	436	$base
380	}	437	}
381		438
		439	=back
		440
382	=head2 TILING MODES	441	=head2 TILING MODES
383		442
384	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
385	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.
386		445
387	=over 4	446	=over
388		447
389	=item tile $img	448	=item tile $img
390		449
391	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
392	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.
…		…
467	dimensions. They are not (Perl-) variables, they just return stuff that	526	dimensions. They are not (Perl-) variables, they just return stuff that
468	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
469	example using C<TW> (terminal width) means your expression is evaluated	528	example using C<TW> (terminal width) means your expression is evaluated
470	again when the terminal is resized.	529	again when the terminal is resized.
471		530
472	=over 4	531	=over
473		532
474	=item TX	533	=item TX
475		534
476	=item TY	535	=item TY
477		536
478	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
479	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
480	border-respect mode).	539	border-respect mode).
481		540
482	Using these functions make your expression sensitive to window moves.	541	Using these functions makes your expression sensitive to window moves.
483		542
484	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.
485		544
486	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
487	background (that's exactly what C<rootalign> does btw.):	546	background (that's exactly what C<rootalign> does btw.):
488		547
489	move -TX, -TY, keep { load "mybg.png" }	548	move -TX, -TY, keep { load "mybg.png" }
490		549
491	=item TW	550	=item TW
		551
		552	=item TH
492		553
493	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
494	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
495	when in border-respect mode).	556	when in border-respect mode).
496		557
497	Using these functions make your expression sensitive to window resizes.	558	Using these functions makes your expression sensitive to window resizes.
498		559
499	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
500	the window size to conserve memory.	561	the window size to conserve memory.
501		562
502	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
503	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.
504		565
505	clip move -TX, -TY, keep { blur 5, root }	566	clip move -TX, -TY, keep { blur 5, root }
506		567
507	=cut	568	=item FOCUS
508		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
509	sub TX() { $frame->[FR_AGAIN]{position} = 1; $x }	586	sub TX () { $frame->[FR_AGAIN]{position} = 1; $x }
510	sub TY() { $frame->[FR_AGAIN]{position} = 1; $y }	587	sub TY () { $frame->[FR_AGAIN]{position} = 1; $y }
511	sub TW() { $frame->[FR_AGAIN]{size} = 1; $w }	588	sub TW () { $frame->[FR_AGAIN]{size} = 1; $w }
512	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 }
513		591
514	=item now	592	=item now
515		593
516	Returns the current time as (fractional) seconds since the epoch.	594	Returns the current time as (fractional) seconds since the epoch.
517		595
…		…
551		629
552	=head2 SHAPE CHANGING OPERATORS	630	=head2 SHAPE CHANGING OPERATORS
553		631
554	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.
555		633
556	=over 4	634	=over
557		635
558	=item clip $img	636	=item clip $img
559		637
560	=item clip $width, $height, $img	638	=item clip $width, $height, $img
561		639
…		…
564	Clips an image to the given rectangle. If the rectangle is outside the	642	Clips an image to the given rectangle. If the rectangle is outside the
565	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is	643	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is
566	larger than the image, then the tiling mode defines how the extra pixels	644	larger than the image, then the tiling mode defines how the extra pixels
567	will be filled.	645	will be filled.
568		646
569	If C<$x> an C<$y> are missing, then C<0> is assumed for both.	647	If C<$x> and C<$y> are missing, then C<0> is assumed for both.
570		648
571	If C<$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
572	assumed.	650	assumed.
573		651
574	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
…		…
592	=item scale $width_factor, $height_factor, $img	670	=item scale $width_factor, $height_factor, $img
593		671
594	Scales the image by the given factors in horizontal	672	Scales the image by the given factors in horizontal
595	(C<$width>) and vertical (C<$height>) direction.	673	(C<$width>) and vertical (C<$height>) direction.
596		674
597	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.
598		676
599	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
600	keeping aspect.	678	keeping aspect.
601		679
602	=item resize $width, $height, $img	680	=item resize $width, $height, $img
…		…
727	=item rotate $center_x, $center_y, $degrees, $img	805	=item rotate $center_x, $center_y, $degrees, $img
728		806
729	Rotates the image clockwise by C<$degrees> degrees, around the point at	807	Rotates the image clockwise by C<$degrees> degrees, around the point at
730	C<$center_x> and C<$center_y> (specified as factor of image width/height).	808	C<$center_x> and C<$center_y> (specified as factor of image width/height).
731		809
732	Example: rotate the image by 90 degrees around it's center.	810	Example: rotate the image by 90 degrees around its center.
733		811
734	rotate 0.5, 0.5, 90, keep { load "$HOME/mybg.png" }	812	rotate 0.5, 0.5, 90, keep { load "$HOME/mybg.png" }
735		813
736	=cut	814	=cut
737		815
…		…
748		826
749	=head2 COLOUR MODIFICATIONS	827	=head2 COLOUR MODIFICATIONS
750		828
751	The following operators change the pixels of the image.	829	The following operators change the pixels of the image.
752		830
753	=over 4	831	=over
754		832
755	=item tint $color, $img	833	=item tint $color, $img
756		834
757	Tints the image in the given colour.	835	Tints the image in the given colour.
758		836
…		…
766		844
767	=cut	845	=cut
768		846
769	sub tint($$) {	847	sub tint($$) {
770	$_[1]->tint ($_[0])	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($$) {
		858	$_[1]->shade ($_[0])
771	}	859	}
772		860
773	=item contrast $factor, $img	861	=item contrast $factor, $img
774		862
775	=item contrast $r, $g, $b, $img	863	=item contrast $r, $g, $b, $img
…		…
806	latter in a white picture.	894	latter in a white picture.
807		895
808	Due to idiosyncrasies in the underlying XRender extension, biases less	896	Due to idiosyncrasies in the underlying XRender extension, biases less
809	than zero can be I<very> slow.	897	than zero can be I<very> slow.
810		898
		899	You can also try the experimental(!) C<muladd> operator.
		900
811	=cut	901	=cut
812		902
813	sub contrast($$;$$;$) {	903	sub contrast($$;$$;$) {
814	my $img = pop;	904	my $img = pop;
815	my ($r, $g, $b, $a) = @_;	905	my ($r, $g, $b, $a) = @_;
…		…
830	$a = 1 if @_ < 4;	920	$a = 1 if @_ < 4;
831		921
832	$img = $img->clone;	922	$img = $img->clone;
833	$img->brightness ($r, $g, $b, $a);	923	$img->brightness ($r, $g, $b, $a);
834	$img	924	$img
		925	}
		926
		927	=item muladd $mul, $add, $img # EXPERIMENTAL
		928
		929	First multiplies the pixels by C<$mul>, then adds C<$add>. This can be used
		930	to implement brightness and contrast at the same time, with a wider value
		931	range than contrast and brightness operators.
		932
		933	Due to numerous bugs in XRender implementations, it can also introduce a
		934	number of visual artifacts.
		935
		936	Example: increase contrast by a factor of C<$c> without changing image
		937	brightness too much.
		938
		939	muladd $c, (1 - $c) * 0.5, $img
		940
		941	=cut
		942
		943	sub muladd($$$) {
		944	$_[2]->muladd ($_[0], $_[1])
835	}	945	}
836		946
837	=item blur $radius, $img	947	=item blur $radius, $img
838		948
839	=item blur $radius_horz, $radius_vert, $img	949	=item blur $radius_horz, $radius_vert, $img
…		…
851	sub blur($$;$) {	961	sub blur($$;$) {
852	my $img = pop;	962	my $img = pop;
853	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])	963	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
854	}	964	}
855		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 ()); # Color_fade not always available
		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
856	=back	999	=back
857		1000
858	=head2 OTHER STUFF	1001	=head2 OTHER STUFF
859		1002
860	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
861	force and closing our eyes.	1004	force and closing our eyes.
862		1005
863	=over 4	1006	=over
864		1007
865	=item keep { ... }	1008	=item keep { ... }
866		1009
867	This operator 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
868	statements enclosed by braces.	1011	statements enclosed by braces.
…		…
884	C<keep> block so it only is reevaluated as required.	1027	C<keep> block so it only is reevaluated as required.
885		1028
886	Putting the blur into a C<keep> 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
887	once, while the C<rootalign> is still done each time the window moves.	1030	once, while the C<rootalign> is still done each time the window moves.
888		1031
889	rootlign keep { blur 10, root }	1032	rootalign keep { blur 10, root }
890		1033
891	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,
892	in case the root background changes: If expression inside the block	1035	in case the root background changes: If expression inside the block
893	is sensitive to some event (root background changes, window geometry	1036	is sensitive to some event (root background changes, window geometry
894	changes), then it will be reevaluated automatically as needed.	1037	changes), then it will be reevaluated automatically as needed.
		1038
		1039	=back
		1040
		1041	=head1 OLD BACKGROUND IMAGE SETTINGS
		1042
		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.
		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
895		1186
896	=cut	1187	=cut
897		1188
898	sub keep(&) {	1189	sub keep(&) {
899	my $id = $_[0]+0;	1190	my $id = $_[0]+0;
…		…
932	=cut	1223	=cut
933		1224
934	}	1225	}
935		1226
936	sub parse_expr {	1227	sub parse_expr {
		1228	my ($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 {
937	my $expr = eval	1236	$expr = eval
938	"sub {\n"	1237	"sub {\n"
939	. "package urxvt::bgdsl;\n"	1238	. "package urxvt::bgdsl;\n"
940	. "#line 0 'background expression'\n"	1239	. "#line 0 'background expression'\n"
941	. "$_[0]\n"	1240	. "$expr\n"
942	. "}";	1241	. "}";
943	die if $@;	1242	die if $@;
		1243	}
		1244
944	$expr	1245	$expr
945	}	1246	}
946		1247
947	# compiles a parsed expression	1248	# compiles a parsed expression
948	sub set_expr {	1249	sub set_expr {
949	my ($self, $expr) = @_;	1250	my ($self, $expr) = @_;
950		1251
951	$self->{root} = [];	1252	$self->{root} = []; # the outermost frame
952	$self->{expr} = $expr;	1253	$self->{expr} = $expr;
953	$self->recalculate;	1254	$self->recalculate;
954	}	1255	}
955		1256
956	# takes a hash of sensitivity indicators and installs watchers	1257	# takes a hash of sensitivity indicators and installs watchers
…		…
997	if ($again->{rootpmap}) {	1298	if ($again->{rootpmap}) {
998	$state->{rootpmap} = $self->on (rootpmap_change => $cb);	1299	$state->{rootpmap} = $self->on (rootpmap_change => $cb);
999	} else {	1300	} else {
1000	delete $state->{rootpmap};	1301	delete $state->{rootpmap};
1001	}	1302	}
		1303
		1304	if ($again->{focus}) {
		1305	$state->{focus} = $self->on (focus_in => $cb, focus_out => $cb);
		1306	} else {
		1307	delete $state->{focus};
		1308	}
1002	}	1309	}
1003		1310
1004	# evaluate the current bg expression	1311	# evaluate the current bg expression
1005	sub recalculate {	1312	sub recalculate {
1006	my ($arg_self) = @_;	1313	my ($arg_self) = @_;
…		…
1014	return;	1321	return;
1015	}	1322	}
1016		1323
1017	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;	1324	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;
1018		1325
		1326	unless ($arg_self->has_render) {
		1327	warn "background extension needs RENDER extension 0.11 or higher, ignoring background-expr.\n";
		1328	return;
		1329	}
		1330
1019	# set environment to evaluate user expression	1331	# set environment to evaluate user expression
1020		1332
1021	local $self = $arg_self;	1333	local $self = $arg_self;
1022	local $HOME = $ENV{HOME};	1334	local $HOME = $ENV{HOME};
1023	local $frame = [];	1335	local $frame = $self->{root};
1024		1336
1025	($x, $y, $w, $h) = $self->background_geometry ($self->{border});	1337	($x, $y, $w, $h) = $self->background_geometry ($self->{border});
		1338	$focus = $self->focus;
1026		1339
1027	# evaluate user expression	1340	# evaluate user expression
1028		1341
1029	my @img = eval { $self->{expr}->() };	1342	my @img = eval { $self->{expr}->() };
1030	die $@ if $@;	1343	die $@ if $@;
1031	die "background-expr did not return anything.\n" unless @img;	1344	die "background-expr did not return anything.\n" unless @img;
		1345
		1346	if ($img[0]) {
1032	die "background-expr: expected image(s), got something else.\n"	1347	die "background-expr: expected image(s), got something else.\n"
1033	if grep { !UNIVERSAL::isa $_, "urxvt::img" } @img;	1348	if grep { !UNIVERSAL::isa $_, "urxvt::img" } @img;
1034		1349
1035	my $img = urxvt::bgdsl::merge @img;	1350	my $img = urxvt::bgdsl::merge @img;
1036		1351
1037	$frame->[FR_AGAIN]{size} = 1	1352	$frame->[urxvt::bgdsl::FR_AGAIN]{size} = 1
1038	if $img->repeat_mode != urxvt::RepeatNormal;	1353	if $img->repeat_mode != urxvt::RepeatNormal;
1039		1354
1040	# if the expression is sensitive to external events, prepare reevaluation then	1355	# if the expression is sensitive to external events, prepare reevaluation then
1041	$self->compile_frame ($frame, sub { $arg_self->recalculate });	1356	$self->compile_frame ($frame, sub { $arg_self->recalculate });
1042		1357
1043	# clear stuff we no longer need	1358	# clear stuff we no longer need
1044		1359
1045	# unless (%{ $frame->[FR_STATE] }) {	1360	# unless (%{ $frame->[FR_STATE] }) {
1046	# delete $self->{state};	1361	# delete $self->{state};
1047	# delete $self->{expr};	1362	# delete $self->{expr};
1048	# }	1363	# }
1049		1364
1050	# set background pixmap	1365	# set background pixmap
1051		1366
1052	$self->set_background ($img, $self->{border});	1367	$self->set_background ($img, $self->{border});
		1368	} else {
		1369	$self->clr_background;
		1370	}
		1371
1053	$self->scr_recolour (0);	1372	$self->scr_recolor (0);
1054	$self->want_refresh;	1373	$self->want_refresh;
1055	}	1374	}
1056		1375
		1376	sub old_bg_opts {
		1377	my ($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 $y;
		1448	}
		1449	}
		1450	}
		1451
		1452	# helper function, quote string as perl without allowing
		1453	# any code execution or other shenanigans.
		1454	sub q0 {
		1455	"qq\x00\Q$_[0]\E\x00"
		1456	}
		1457
		1458	sub old_bg_expr {
		1459	my ($self) = @_;
		1460
		1461	my $expr;
		1462
		1463	my $bg_opts = $self->{bg_opts};
		1464
		1465	if ($bg_opts->{root} =~ /^\s(?:true\|yes\|on\|1)\s$/i) {
		1466	$expr .= "tile (";
		1467
		1468	my $shade = $bg_opts->{shade};
		1469
		1470	if ($shade) {
		1471	$shade = List::Util::min $shade, 200;
		1472	$shade = List::Util::max $shade, -100;
		1473	$shade = 200 - (100 + $shade) if $shade < 0;
		1474
		1475	$shade = $shade * 0.01 - 1;
		1476	$expr .= "shade $shade, ";
		1477	}
		1478
		1479	my $tint = $bg_opts->{tint};
		1480
		1481	if ($tint) {
		1482	$tint = q0 $tint;
		1483	$expr .= "tint $tint,";
		1484	}
		1485
		1486	my $blur = $bg_opts->{blur};
		1487
		1488	if ($blur and $blur =~ /^ =? ([0-9]+)? (?:[xX] ([0-9]+))? $/x) {
		1489	my $hr = defined $1 ? $1 : 1;
		1490	my $vr = defined $2 ? $2 : $hr;
		1491
		1492	if ($hr != 0 and $vr != 0) {
		1493	$expr .= "blur $hr, $vr, ";
		1494	}
		1495	}
		1496
		1497	$expr .= "rootalign root)";
		1498	}
		1499
		1500	if ($bg_opts->{path}) {
		1501	my $file_expr;
		1502	my $h_scale = $bg_opts->{h_scale} * 0.01;
		1503	my $v_scale = $bg_opts->{v_scale} * 0.01;
		1504	my $h_align = $bg_opts->{h_align} * 0.01;
		1505	my $v_align = $bg_opts->{v_align} * 0.01;
		1506
		1507	if (!$bg_opts->{tile}) {
		1508	$file_expr .= "pad (";
		1509	} else {
		1510	$file_expr .= "tile (";
		1511	}
		1512
		1513	if ($bg_opts->{root_align}) {
		1514	$file_expr .= "rootalign ";
		1515	} else {
		1516	$file_expr .= "align $h_align, $v_align, ";
		1517	}
		1518
		1519	if ($h_scale != 0 and $v_scale != 0) {
		1520	my $op = $bg_opts->{keep_aspect} ? "fit" : "resize";
		1521	$file_expr .= "$op TW * $h_scale, TH * $v_scale, ";
		1522	}
		1523
		1524	my $path = q0 $bg_opts->{path};
		1525
		1526	$file_expr .= "keep { load $path })";
		1527
		1528	if ($expr) {
		1529	$expr .= ", tint (\"[50]white\", $file_expr)";
		1530	} else {
		1531	$expr = $file_expr;
		1532	}
		1533	}
		1534
		1535	$expr
		1536	}
		1537
		1538	sub find_resource {
		1539	my ($self, $res, $opt) = @_;
		1540
		1541	my $v = $self->x_resource ($opt);
		1542	$v = $self->x_resource ($res) unless defined $v;
		1543
		1544	$v
		1545	}
		1546
		1547	sub parse_bgopts {
		1548	my ($self) = @_;
		1549
		1550	my $expr = $self->x_resource ("%.expr");
		1551
		1552	if (!$expr) {
		1553	$self->{bg_opts} = { h_scale => 100, v_scale => 100,
		1554	h_align => 50, v_align => 50 };
		1555
		1556	$self->{bg_opts}{shade} = $self->find_resource ("shading", "sh");
		1557	$self->{bg_opts}{tint} = $self->find_resource ("tintColor", "tint");
		1558	$self->{bg_opts}{blur} = $self->find_resource ("blurRadius", "blr");
		1559	$self->{bg_opts}{root} = $self->find_resource ("transparent", "tr");
		1560
		1561	$self->old_bg_opts ($self->find_resource ("backgroundPixmap", "pixmap"));
		1562	$expr = $self->old_bg_expr;
		1563	}
		1564
		1565	$self->set_expr (parse_expr $expr);
		1566	$self->{border} = $self->x_resource_boolean ("%.border");
		1567
		1568	$MIN_INTERVAL = $self->x_resource ("%.interval");
		1569	}
		1570
1057	sub on_start {	1571	sub on_start {
1058	my ($self) = @_;	1572	my ($self) = @_;
1059		1573
1060	my $expr = $self->x_resource ("%.expr")	1574	$self->parse_bgopts;
1061	or return;
1062
1063	$self->has_render
1064	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";
1065
1066	$self->set_expr (parse_expr $expr);
1067	$self->{border} = $self->x_resource_boolean ("%.border");
1068
1069	$MIN_INTERVAL = $self->x_resource ("%.interval");
1070		1575
1071	()	1576	()
1072	}	1577	}
1073		1578
		1579	sub on_osc_seq {
		1580	my ($self, $op, $arg) = @_;
		1581
		1582	$op eq "20" or $op eq "705"
		1583	or return;
		1584
		1585	$self->{bg_opts}
		1586	or $self->parse_bgopts;
		1587
		1588	if ($op eq "20") {
		1589	if ($arg eq "?") {
		1590	my $h_scale = $self->{bg_opts}{h_scale};
		1591	my $v_scale = $self->{bg_opts}{v_scale};
		1592	my $h_align = $self->{bg_opts}{h_align};
		1593	my $v_align = $self->{bg_opts}{v_align};
		1594	$self->cmd_parse ("\033]2;[${h_scale}x${v_scale}+${h_align}+${v_align}]\007");
		1595	} else {
		1596	$self->old_bg_opts ($arg);
		1597	my $expr = $self->old_bg_expr;
		1598	$self->set_expr (parse_expr $expr) if $expr;
		1599	}
		1600	} elsif ($op eq "705") {
		1601	$self->{bg_opts}{tint} = $arg;
		1602	my $expr = $self->old_bg_expr;
		1603	$self->set_expr (parse_expr $expr) if $expr;
		1604	}
		1605
		1606	1
		1607	}
		1608

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.70 by root, Mon Jul 2 01:35:37 2012 UTC vs. Revision 1.110 by sf-exg, Tue Dec 6 09:02:19 2022 UTC

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Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.70 by root, Mon Jul 2 01:35:37 2012 UTC vs.
Revision 1.110 by sf-exg, Tue Dec 6 09:02:19 2022 UTC