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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.49 by root, Sun Jun 10 15:29:18 2012 UTC vs.
Revision 1.92 by sf-exg, Thu Jul 14 05:33:26 2016 UTC

…		…
1	#! perl	1	#! perl
2		2
3	#:META:X_RESOURCE:%.expr:string:background expression	3	#:META:RESOURCE:%.expr:string:background expression
4	#:META:X_RESOURCE:%.border:boolean:respect the terminal border	4	#:META:RESOURCE:%.border:boolean:respect the terminal border
5	#:META:X_RESOURCE:%.interval:seconds:minimum time between updates	5	#:META:RESOURCE:%.interval:seconds:minimum time between updates
6		6	#:META:RESOURCE:pixmap:file[;geom]:set image as background
7	#TODO: once, rootalign	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
8		16
9	=head1 NAME	17	=head1 NAME
10		18
11	background - manage terminal background	19	background - manage terminal background
12		20
13	=head1 SYNOPSIS	21	=head1 SYNOPSIS
14		22
15	urxvt --background-expr 'background expression'	23	urxvt --background-expr 'background expression'
16	--background-border	24	--background-border
17	--background-interval seconds	25	--background-interval seconds
18		26
		27	=head1 QUICK AND DIRTY CHEAT SHEET
		28
		29	Just load a random jpeg image and tile the background with it without
		30	scaling or anything else:
		31
		32	load "/path/to/img.jpg"
		33
		34	The same, but use mirroring/reflection instead of tiling:
		35
		36	mirror load "/path/to/img.jpg"
		37
		38	Load an image and scale it to exactly fill the terminal window:
		39
		40	scale keep { load "/path/to/img.jpg" }
		41
		42	Implement pseudo-transparency by using a suitably-aligned root pixmap
		43	as window background:
		44
		45	rootalign root
		46
		47	Likewise, but keep a blurred copy:
		48
		49	rootalign keep { blur 10, root }
		50
19	=head1 DESCRIPTION	51	=head1 DESCRIPTION
20		52
21	This extension manages the terminal background by creating a picture that	53	This extension manages the terminal background by creating a picture that
22	is behind the text, replacing the normal background colour.	54	is behind the text, replacing the normal background colour.
23		55
28	to be as simple as possible.	60	to be as simple as possible.
29		61
30	For example, to load an image and scale it to the window size, you would	62	For example, to load an image and scale it to the window size, you would
31	use:	63	use:
32		64
33	urxvt --background-expr 'scale load "/path/to/mybg.png"'	65	urxvt --background-expr 'scale keep { load "/path/to/mybg.png" }'
34		66
35	Or specified as a X resource:	67	Or specified as a X resource:
36		68
37	URxvt.background-expr: scale load "/path/to/mybg.png"	69	URxvt.background.expr: scale keep { load "/path/to/mybg.png" }
38		70
39	=head1 THEORY OF OPERATION	71	=head1 THEORY OF OPERATION
40		72
41	At startup, just before the window is mapped for the first time, the	73	At startup, just before the window is mapped for the first time, the
42	expression is evaluated and must yield an image. The image is then	74	expression is evaluated and must yield an image. The image is then
…		…
55	If any of the parameters that the expression relies on changes (when the	87	If any of the parameters that the expression relies on changes (when the
56	window is moved or resized, its position or size changes; when the root	88	window is moved or resized, its position or size changes; when the root
57	pixmap is replaced by another one the root background changes; or when the	89	pixmap is replaced by another one the root background changes; or when the
58	timer elapses), then the expression will be evaluated again.	90	timer elapses), then the expression will be evaluated again.
59		91
60	For example, an expression such as C<scale load "$HOME/mybg.png"> scales the	92	For example, an expression such as C<scale keep { load "$HOME/mybg.png"
61	image to the window size, so it relies on the window size and will	93	}> scales the image to the window size, so it relies on the window size
62	be reevaluated each time it is changed, but not when it moves for	94	and will be reevaluated each time it is changed, but not when it moves for
63	example. That ensures that the picture always fills the terminal, even	95	example. That ensures that the picture always fills the terminal, even
64	after it's size changes.	96	after its size changes.
65		97
66	=head2 EXPRESSIONS	98	=head2 EXPRESSIONS
67		99
68	Expressions are normal Perl expressions, in fact, they are Perl blocks -	100	Expressions are normal Perl expressions, in fact, they are Perl blocks -
69	which means you could use multiple lines and statements:	101	which means you could use multiple lines and statements:
70		102
		103	scale keep {
71	again 3600;	104	again 3600;
72	if (localtime now)[6]) {	105	if (localtime now)[6]) {
73	return scale load "$HOME/weekday.png";	106	return load "$HOME/weekday.png";
74	} else {	107	} else {
75	return scale load "$HOME/sunday.png";	108	return load "$HOME/sunday.png";
		109	}
76	}	110	}
77		111
78	This expression gets evaluated once per hour. It will set F<sunday.png> as	112	This inner expression is evaluated once per hour (and whenever the
		113	terminal window is resized). It sets F<sunday.png> as background on
79	background on Sundays, and F<weekday.png> on all other days.	114	Sundays, and F<weekday.png> on all other days.
80		115
81	Fortunately, we expect that most expressions will be much simpler, with	116	Fortunately, we expect that most expressions will be much simpler, with
82	little Perl knowledge needed.	117	little Perl knowledge needed.
83		118
84	Basically, you always start with a function that "generates" an image	119	Basically, you always start with a function that "generates" an image
…		…
107	get a percentage):	142	get a percentage):
108		143
109	scale 2, load "$HOME/mypic.png"	144	scale 2, load "$HOME/mypic.png"
110		145
111	This enlarges the image by a factor of 2 (200%). As you can see, C<scale>	146	This enlarges the image by a factor of 2 (200%). As you can see, C<scale>
112	has now two arguments, the C<200> and the C<load> expression, while	147	has now two arguments, the C<2> and the C<load> expression, while
113	C<load> only has one argument. Arguments are separated from each other by	148	C<load> only has one argument. Arguments are separated from each other by
114	commas.	149	commas.
115		150
116	Scale also accepts two arguments, which are then separate factors for both	151	Scale also accepts two arguments, which are then separate factors for both
117	horizontal and vertical dimensions. For example, this halves the image	152	horizontal and vertical dimensions. For example, this halves the image
118	width and doubles the image height:	153	width and doubles the image height:
119		154
120	scale 0.5, 2, load "$HOME/mypic.png"	155	scale 0.5, 2, load "$HOME/mypic.png"
121		156
122	Other effects than scalign are also readily available, for exmaple, you can	157	IF you try out these expressions, you might suffer from some sluggishness,
123	tile the image to fill the whole window, instead of resizing it:	158	because each time the terminal is resized, it loads the PNG image again
		159	and scales it. Scaling is usually fast (and unavoidable), but loading the
		160	image can be quite time consuming. This is where C<keep> comes in handy:
124		161
		162	scale 0.5, 2, keep { load "$HOME/mypic.png" }
		163
		164	The C<keep> operator executes all the statements inside the braces only
		165	once, or when it thinks the outcome might change. In other cases it
		166	returns the last value computed by the brace block.
		167
		168	This means that the C<load> is only executed once, which makes it much
		169	faster, but also means that more memory is being used, because the loaded
		170	image must be kept in memory at all times. In this expression, the
		171	trade-off is likely worth it.
		172
		173	But back to effects: Other effects than scaling are also readily
		174	available, for example, you can tile the image to fill the whole window,
		175	instead of resizing it:
		176
125	tile load "$HOME/mypic.png"	177	tile keep { load "$HOME/mypic.png" }
126		178
127	In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator	179	In fact, images returned by C<load> are in C<tile> mode by default, so the
128	is kind of superfluous.	180	C<tile> operator is kind of superfluous.
129		181
130	Another common effect is to mirror the image, so that the same edges touch:	182	Another common effect is to mirror the image, so that the same edges
		183	touch:
131		184
132	mirror load "$HOME/mypic.png"	185	mirror keep { load "$HOME/mypic.png" }
133		186
134	This is also a typical background expression:	187	Another common background expression is:
135		188
136	rootalign root	189	rootalign root
137		190
138	It first takes a snapshot of the screen background image, and then	191	This one first takes a snapshot of the screen background image, and then
139	moves it to the upper left corner of the screen - the result is	192	moves it to the upper left corner of the screen (as opposed to the upper
140	pseudo-transparency, as the image seems to be static while the window is	193	left corner of the terminal window)- the result is pseudo-transparency:
141	moved around.	194	the image seems to be static while the window is moved around.
142		195
143	=head2 CYCLES AND CACHING	196	=head2 COLOUR SPECIFICATIONS
144		197
145	As has been mentioned before, the expression might be evaluated multiple	198	Whenever an operator expects a "colour", then this can be specified in one
146	times. Each time the expression is reevaluated, a new cycle is said to	199	of two ways: Either as string with an X11 colour specification, such as:
147	have begun. Many operators cache their results till the next cycle.
148		200
149	For example, the C<load> operator keeps a copy of the image. If it is	201	"red" # named colour
150	asked to load the same image on the next cycle it will not load it again,	202	"#f00" # simple rgb
151	but return the cached copy.	203	"[50]red" # red with 50% alpha
		204	"TekHVC:300/50/50" # anything goes
152		205
153	This only works for one cycle though, so as long as you load the same	206	OR as an array reference with one, three or four components:
154	image every time, it will always be cached, but when you load a different
155	image, it will forget about the first one.
156		207
157	This allows you to either speed things up by keeping multiple images in	208	[0.5] # 50% gray, 100% alpha
158	memory, or comserve memory by loading images more often.	209	[0.5, 0, 0] # dark red, no green or blur, 100% alpha
		210	[0.5, 0, 0, 0.7] # same with explicit 70% alpha
159		211
160	For example, you can keep two images in memory and use a random one like	212	=head2 CACHING AND SENSITIVITY
161	this:
162		213
163	my $img1 = load "img1.png";	214	Since some operations (such as C<load> and C<blur>) can take a long time,
164	my $img2 = load "img2.png";	215	caching results can be very important for a smooth operation. Caching can
165	(0.5 > rand) ? $img1 : $img2	216	also be useful to reduce memory usage, though, for example, when an image
		217	is cached by C<load>, it could be shared by multiple terminal windows
		218	running inside urxvtd.
166		219
167	Since both images are "loaded" every time the expression is evaluated,	220	=head3 C<keep { ... }> caching
168	they are always kept in memory. Contrast this version:
169		221
170	my $path1 = "img1.png";	222	The most important way to cache expensive operations is to use C<keep {
171	my $path2 = "img2.png";	223	... }>. The C<keep> operator takes a block of multiple statements enclosed
172	load ((0.5 > rand) ? $path1 : $path2)	224	by C<{}> and keeps the return value in memory.
173		225
174	Here, a path is selected randomly, and load is only called for one image,	226	An expression can be "sensitive" to various external events, such as
175	so keeps only one image in memory. If, on the next evaluation, luck	227	scaling or moving the window, root background changes and timers. Simply
176	decides to use the other path, then it will have to load that image again.	228	using an expression (such as C<scale> without parameters) that depends on
		229	certain changing values (called "variables"), or using those variables
		230	directly, will make an expression sensitive to these events - for example,
		231	using C<scale> or C<TW> will make the expression sensitive to the terminal
		232	size, and thus to resizing events.
		233
		234	When such an event happens, C<keep> will automatically trigger a
		235	reevaluation of the whole expression with the new value of the expression.
		236
		237	C<keep> is most useful for expensive operations, such as C<blur>:
		238
		239	rootalign keep { blur 20, root }
		240
		241	This makes a blurred copy of the root background once, and on subsequent
		242	calls, just root-aligns it. Since C<blur> is usually quite slow and
		243	C<rootalign> is quite fast, this trades extra memory (for the cached
		244	blurred pixmap) with speed (blur only needs to be redone when root
		245	changes).
		246
		247	=head3 C<load> caching
		248
		249	The C<load> operator itself does not keep images in memory, but as long as
		250	the image is still in memory, C<load> will use the in-memory image instead
		251	of loading it freshly from disk.
		252
		253	That means that this expression:
		254
		255	keep { load "$HOME/path..." }
		256
		257	Not only caches the image in memory, other terminal instances that try to
		258	C<load> it can reuse that in-memory copy.
177		259
178	=head1 REFERENCE	260	=head1 REFERENCE
179		261
180	=head2 COMMAND LINE SWITCHES	262	=head2 COMMAND LINE SWITCHES
181		263
…		…
193	Specifying this flag changes the behaviour, so that the image only	275	Specifying this flag changes the behaviour, so that the image only
194	replaces the background of the character area.	276	replaces the background of the character area.
195		277
196	=item --background-interval seconds	278	=item --background-interval seconds
197		279
198	Since some operations in the underlying XRender extension can effetively	280	Since some operations in the underlying XRender extension can effectively
199	freeze your X-server for prolonged time, this extension enforces a minimum	281	freeze your X-server for prolonged time, this extension enforces a minimum
200	time between updates, which is normally about 0.1 seconds.	282	time between updates, which is normally about 0.1 seconds.
201		283
202	If you want to do updates more often, you can decrease this safety	284	If you want to do updates more often, you can decrease this safety
203	interval with this switch.	285	interval with this switch.
204		286
205	=back	287	=back
206		288
207	=cut	289	=cut
208		290
209	our %_IMGCACHE;	291	our %_IMG_CACHE;
210	our $HOME;	292	our $HOME;
211	our ($self, $old, $new);	293	our ($self, $frame);
212	our ($x, $y, $w, $h);	294	our ($x, $y, $w, $h, $focus);
213		295
214	# enforce at least this interval between updates	296	# enforce at least this interval between updates
215	our $MIN_INTERVAL = 6/59.951;	297	our $MIN_INTERVAL = 6/59.951;
216		298
217	{	299	{
218	package urxvt::bgdsl; # background language	300	package urxvt::bgdsl; # background language
		301
		302	sub FR_PARENT() { 0 } # parent frame, if any - must be #0
		303	sub FR_CACHE () { 1 } # cached values
		304	sub FR_AGAIN () { 2 } # what this expr is sensitive to
		305	sub FR_STATE () { 3 } # watchers etc.
219		306
220	use List::Util qw(min max sum shuffle);	307	use List::Util qw(min max sum shuffle);
221		308
222	=head2 PROVIDERS/GENERATORS	309	=head2 PROVIDERS/GENERATORS
223		310
…		…
230	=item load $path	317	=item load $path
231		318
232	Loads the image at the given C<$path>. The image is set to plane tiling	319	Loads the image at the given C<$path>. The image is set to plane tiling
233	mode.	320	mode.
234		321
235	Loaded images will be cached for one cycle.	322	If the image is already in memory (e.g. because another terminal instance
		323	uses it), then the in-memory copy is returned instead.
236		324
		325	=item load_uc $path
		326
		327	Load uncached - same as load, but does not cache the image, which means it
		328	is I<always> loaded from the filesystem again, even if another copy of it
		329	is in memory at the time.
		330
237	=cut	331	=cut
		332
		333	sub load_uc($) {
		334	$self->new_img_from_file ($_[0])
		335	}
238		336
239	sub load($) {	337	sub load($) {
240	my ($path) = @_;	338	my ($path) = @_;
241		339
242	$new->{load}{$path} = $old->{load}{$path} \|\| $self->new_img_from_file ($path);	340	$_IMG_CACHE{$path} \|\| do {
		341	my $img = load_uc $path;
		342	Scalar::Util::weaken ($_IMG_CACHE{$path} = $img);
		343	$img
		344	}
243	}	345	}
244		346
245	=item root	347	=item root
246		348
247	Returns the root window pixmap, that is, hopefully, the background image	349	Returns the root window pixmap, that is, hopefully, the background image
248	of your screen. The image is set to extend mode.	350	of your screen.
249		351
250	This function makes your expression root sensitive, that means it will be	352	This function makes your expression root sensitive, that means it will be
251	reevaluated when the bg image changes.	353	reevaluated when the bg image changes.
252		354
253	=cut	355	=cut
254		356
255	sub root() {	357	sub root() {
256	$new->{rootpmap_sensitive} = 1;	358	$frame->[FR_AGAIN]{rootpmap} = 1;
257	die "root op not supported, exg, we need you";	359	$self->new_img_from_root
258	}	360	}
259		361
260	=item solid $colour	362	=item solid $colour
261		363
262	=item solid $width, $height, $colour	364	=item solid $width, $height, $colour
…		…
270	=cut	372	=cut
271		373
272	sub solid($;$$) {	374	sub solid($;$$) {
273	my $colour = pop;	375	my $colour = pop;
274		376
275	my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] \|\| 1, $_[1] \|\| 1);	377	my $img = $self->new_img (urxvt::PictStandardARGB32, 0, 0, $_[0] \|\| 1, $_[1] \|\| 1);
276	$img->fill ($colour);	378	$img->fill ($colour);
277	$img	379	$img
278	}	380	}
279		381
280	=item clone $img	382	=item clone $img
…		…
284		386
285	=cut	387	=cut
286		388
287	sub clone($) {	389	sub clone($) {
288	$_[0]->clone	390	$_[0]->clone
		391	}
		392
		393	=item merge $img ...
		394
		395	Takes any number of images and merges them together, creating a single
		396	image containing them all. The tiling mode of the first image is used as
		397	the tiling mode of the resulting image.
		398
		399	This function is called automatically when an expression returns multiple
		400	images.
		401
		402	=cut
		403
		404	sub merge(@) {
		405	return $_[0] unless $#_;
		406
		407	# rather annoyingly clumsy, but optimisation is for another time
		408
		409	my $x0 = +1e9;
		410	my $y0 = +1e9;
		411	my $x1 = -1e9;
		412	my $y1 = -1e9;
		413
		414	for (@_) {
		415	my ($x, $y, $w, $h) = $_->geometry;
		416
		417	$x0 = $x if $x0 > $x;
		418	$y0 = $y if $y0 > $y;
		419
		420	$x += $w;
		421	$y += $h;
		422
		423	$x1 = $x if $x1 < $x;
		424	$y1 = $y if $y1 < $y;
		425	}
		426
		427	my $base = $self->new_img (urxvt::PictStandardARGB32, $x0, $y0, $x1 - $x0, $y1 - $y0);
		428	$base->repeat_mode ($_[0]->repeat_mode);
		429	$base->fill ([0, 0, 0, 0]);
		430
		431	$base->draw ($_)
		432	for @_;
		433
		434	$base
289	}	435	}
290		436
291	=back	437	=back
292		438
293	=head2 TILING MODES	439	=head2 TILING MODES
…		…
326	become transparent. This mode is most useful when you want to place an	472	become transparent. This mode is most useful when you want to place an
327	image over another image or the background colour while leaving all	473	image over another image or the background colour while leaving all
328	background pixels outside the image unchanged.	474	background pixels outside the image unchanged.
329		475
330	Example: load an image and display it in the upper left corner. The rest	476	Example: load an image and display it in the upper left corner. The rest
331	of the space is left "empty" (transparent or wahtever your compisotr does	477	of the space is left "empty" (transparent or whatever your compositor does
332	in alpha mode, else background colour).	478	in alpha mode, else background colour).
333		479
334	pad load "mybg.png"	480	pad load "mybg.png"
335		481
336	=item extend $img	482	=item extend $img
337		483
338	Extends the image over the whole plane, using the closest pixel in the	484	Extends the image over the whole plane, using the closest pixel in the
339	area outside the image. This mode is mostly useful when you more complex	485	area outside the image. This mode is mostly useful when you use more complex
340	filtering operations and want the pixels outside the image to have the	486	filtering operations and want the pixels outside the image to have the
341	same values as the pixels near the edge.	487	same values as the pixels near the edge.
342		488
343	Example: just for curiosity, how does this pixel extension stuff work?	489	Example: just for curiosity, how does this pixel extension stuff work?
344		490
…		…
388		534
389	Return the X and Y coordinates of the terminal window (the terminal	535	Return the X and Y coordinates of the terminal window (the terminal
390	window is the full window by default, and the character area only when in	536	window is the full window by default, and the character area only when in
391	border-respect mode).	537	border-respect mode).
392		538
393	Using these functions make your expression sensitive to window moves.	539	Using these functions makes your expression sensitive to window moves.
394		540
395	These functions are mainly useful to align images to the root window.	541	These functions are mainly useful to align images to the root window.
396		542
397	Example: load an image and align it so it looks as if anchored to the	543	Example: load an image and align it so it looks as if anchored to the
398	background.	544	background (that's exactly what C<rootalign> does btw.):
399		545
400	move -TX, -TY, load "mybg.png"	546	move -TX, -TY, keep { load "mybg.png" }
401		547
402	=item TW	548	=item TW
		549
		550	=item TH
403		551
404	Return the width (C<TW>) and height (C<TH>) of the terminal window (the	552	Return the width (C<TW>) and height (C<TH>) of the terminal window (the
405	terminal window is the full window by default, and the character area only	553	terminal window is the full window by default, and the character area only
406	when in border-respect mode).	554	when in border-respect mode).
407		555
408	Using these functions make your expression sensitive to window resizes.	556	Using these functions makes your expression sensitive to window resizes.
409		557
410	These functions are mainly useful to scale images, or to clip images to	558	These functions are mainly useful to scale images, or to clip images to
411	the window size to conserve memory.	559	the window size to conserve memory.
412		560
413	Example: take the screen background, clip it to the window size, blur it a	561	Example: take the screen background, clip it to the window size, blur it a
414	bit, align it to the window position and use it as background.	562	bit, align it to the window position and use it as background.
415		563
416	clip move -TX, -TY, blur 5, root	564	clip move -TX, -TY, keep { blur 5, root }
417		565
418	=cut	566	=item FOCUS
419		567
420	sub TX() { $new->{position_sensitive} = 1; $x }	568	Returns a boolean indicating whether the terminal window has keyboard
421	sub TY() { $new->{position_sensitive} = 1; $y }	569	focus, in which case it returns true.
422	sub TW() { $new->{size_sensitive} = 1; $w }	570
423	sub TH() { $new->{size_sensitive} = 1; $h }	571	Using this function makes your expression sensitive to focus changes.
		572
		573	A common use case is to fade the background image when the terminal loses
		574	focus, often together with the C<-fade> command line option. In fact,
		575	there is a special function for just that use case: C<focus_fade>.
		576
		577	Example: use two entirely different background images, depending on
		578	whether the window has focus.
		579
		580	FOCUS ? keep { load "has_focus.jpg" } : keep { load "no_focus.jpg" }
		581
		582	=cut
		583
		584	sub TX () { $frame->[FR_AGAIN]{position} = 1; $x }
		585	sub TY () { $frame->[FR_AGAIN]{position} = 1; $y }
		586	sub TW () { $frame->[FR_AGAIN]{size} = 1; $w }
		587	sub TH () { $frame->[FR_AGAIN]{size} = 1; $h }
		588	sub FOCUS() { $frame->[FR_AGAIN]{focus} = 1; $focus }
424		589
425	=item now	590	=item now
426		591
427	Returns the current time as (fractional) seconds since the epoch.	592	Returns the current time as (fractional) seconds since the epoch.
428		593
…		…
435	C<$seconds> seconds.	600	C<$seconds> seconds.
436		601
437	Example: load some image and rotate it according to the time of day (as if it were	602	Example: load some image and rotate it according to the time of day (as if it were
438	the hour pointer of a clock). Update this image every minute.	603	the hour pointer of a clock). Update this image every minute.
439		604
		605	again 60;
440	again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"	606	rotate 50, 50, (now % 86400) * -72 / 8640, scale keep { load "myclock.png" }
441		607
442	=item counter $seconds	608	=item counter $seconds
443		609
444	Like C<again>, but also returns an increasing counter value, starting at	610	Like C<again>, but also returns an increasing counter value, starting at
445	0, which might be useful for some simple animation effects.	611	0, which might be useful for some simple animation effects.
…		…
447	=cut	613	=cut
448		614
449	sub now() { urxvt::NOW }	615	sub now() { urxvt::NOW }
450		616
451	sub again($) {	617	sub again($) {
452	$new->{again} = $_[0];	618	$frame->[FR_AGAIN]{time} = $_[0];
453	}	619	}
454		620
455	sub counter($) {	621	sub counter($) {
456	$new->{again} = $_[0];	622	$frame->[FR_AGAIN]{time} = $_[0];
457	$self->{counter} + 0	623	$frame->[FR_STATE]{counter} + 0
458	}	624	}
459		625
460	=back	626	=back
461		627
462	=head2 SHAPE CHANGING OPERATORS	628	=head2 SHAPE CHANGING OPERATORS
…		…
474	Clips an image to the given rectangle. If the rectangle is outside the	640	Clips an image to the given rectangle. If the rectangle is outside the
475	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is	641	image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is
476	larger than the image, then the tiling mode defines how the extra pixels	642	larger than the image, then the tiling mode defines how the extra pixels
477	will be filled.	643	will be filled.
478		644
479	If C<$x> an C<$y> are missing, then C<0> is assumed for both.	645	If C<$x> and C<$y> are missing, then C<0> is assumed for both.
480		646
481	If C<$width> and C<$height> are missing, then the window size will be	647	If C<$width> and C<$height> are missing, then the window size will be
482	assumed.	648	assumed.
483		649
484	Example: load an image, blur it, and clip it to the window size to save	650	Example: load an image, blur it, and clip it to the window size to save
485	memory.	651	memory.
486		652
487	clip blur 10, load "mybg.png"	653	clip keep { blur 10, load "mybg.png" }
488		654
489	=cut	655	=cut
490		656
491	sub clip($;$$;$$) {	657	sub clip($;$$;$$) {
492	my $img = pop;	658	my $img = pop;
…		…
502	=item scale $width_factor, $height_factor, $img	668	=item scale $width_factor, $height_factor, $img
503		669
504	Scales the image by the given factors in horizontal	670	Scales the image by the given factors in horizontal
505	(C<$width>) and vertical (C<$height>) direction.	671	(C<$width>) and vertical (C<$height>) direction.
506		672
507	If only one factor is give, it is used for both directions.	673	If only one factor is given, it is used for both directions.
508		674
509	If no factors are given, scales the image to the window size without	675	If no factors are given, scales the image to the window size without
510	keeping aspect.	676	keeping aspect.
511		677
512	=item resize $width, $height, $img	678	=item resize $width, $height, $img
…		…
586	the terminal window (or the box specified by C<$width> and C<$height> if	752	the terminal window (or the box specified by C<$width> and C<$height> if
587	given).	753	given).
588		754
589	Example: load an image and center it.	755	Example: load an image and center it.
590		756
591	center pad load "mybg.png"	757	center keep { pad load "mybg.png" }
592		758
593	=item rootalign $img	759	=item rootalign $img
594		760
595	Moves the image so that it appears glued to the screen as opposed to the	761	Moves the image so that it appears glued to the screen as opposed to the
596	window. This gives the illusion of a larger area behind the window. It is	762	window. This gives the illusion of a larger area behind the window. It is
597	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the	763	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the
598	top left of the screen.	764	top left of the screen.
599		765
600	Example: load a background image, put it in mirror mode and root align it.	766	Example: load a background image, put it in mirror mode and root align it.
601		767
602	rootalign mirror load "mybg.png"	768	rootalign keep { mirror load "mybg.png" }
603		769
604	Example: take the screen background and align it, giving the illusion of	770	Example: take the screen background and align it, giving the illusion of
605	transparency as long as the window isn't in front of other windows.	771	transparency as long as the window isn't in front of other windows.
606		772
607	rootalign root	773	rootalign root
…		…
632		798
633	sub rootalign($) {	799	sub rootalign($) {
634	move -TX, -TY, $_[0]	800	move -TX, -TY, $_[0]
635	}	801	}
636		802
		803	=item rotate $center_x, $center_y, $degrees, $img
		804
		805	Rotates the image clockwise by C<$degrees> degrees, around the point at
		806	C<$center_x> and C<$center_y> (specified as factor of image width/height).
		807
		808	Example: rotate the image by 90 degrees around its center.
		809
		810	rotate 0.5, 0.5, 90, keep { load "$HOME/mybg.png" }
		811
		812	=cut
		813
		814	sub rotate($$$$) {
		815	my $img = pop;
		816	$img->rotate (
		817	$_[0] * ($img->w + $img->x),
		818	$_[1] * ($img->h + $img->y),
		819	$_[2] * (3.14159265 / 180),
		820	)
		821	}
		822
637	=back	823	=back
638		824
639	=head2 COLOUR MODIFICATIONS	825	=head2 COLOUR MODIFICATIONS
640		826
641	The following operators change the pixels of the image.	827	The following operators change the pixels of the image.
642		828
643	=over 4	829	=over 4
		830
		831	=item tint $color, $img
		832
		833	Tints the image in the given colour.
		834
		835	Example: tint the image red.
		836
		837	tint "red", load "rgb.png"
		838
		839	Example: the same, but specify the colour by component.
		840
		841	tint [1, 0, 0], load "rgb.png"
		842
		843	=cut
		844
		845	sub tint($$) {
		846	$_[1]->tint ($_[0])
		847	}
		848
		849	=item shade $factor, $img
		850
		851	Shade the image by the given factor.
		852
		853	=cut
		854
		855	sub shade($$) {
		856	$_[1]->shade ($_[0])
		857	}
644		858
645	=item contrast $factor, $img	859	=item contrast $factor, $img
646		860
647	=item contrast $r, $g, $b, $img	861	=item contrast $r, $g, $b, $img
648		862
…		…
675		889
676	Values less than 0 reduce brightness, while values larger than 0 increase	890	Values less than 0 reduce brightness, while values larger than 0 increase
677	it. Useful range is from -1 to 1 - the former results in a black, the	891	it. Useful range is from -1 to 1 - the former results in a black, the
678	latter in a white picture.	892	latter in a white picture.
679		893
680	Due to idiosynchrasies in the underlying XRender extension, biases less	894	Due to idiosyncrasies in the underlying XRender extension, biases less
681	than zero can be I<very> slow.	895	than zero can be I<very> slow.
		896
		897	You can also try the experimental(!) C<muladd> operator.
682		898
683	=cut	899	=cut
684		900
685	sub contrast($$;$$;$) {	901	sub contrast($$;$$;$) {
686	my $img = pop;	902	my $img = pop;
…		…
702	$a = 1 if @_ < 4;	918	$a = 1 if @_ < 4;
703		919
704	$img = $img->clone;	920	$img = $img->clone;
705	$img->brightness ($r, $g, $b, $a);	921	$img->brightness ($r, $g, $b, $a);
706	$img	922	$img
		923	}
		924
		925	=item muladd $mul, $add, $img # EXPERIMENTAL
		926
		927	First multiplies the pixels by C<$mul>, then adds C<$add>. This can be used
		928	to implement brightness and contrast at the same time, with a wider value
		929	range than contrast and brightness operators.
		930
		931	Due to numerous bugs in XRender implementations, it can also introduce a
		932	number of visual artifacts.
		933
		934	Example: increase contrast by a factor of C<$c> without changing image
		935	brightness too much.
		936
		937	muladd $c, (1 - $c) * 0.5, $img
		938
		939	=cut
		940
		941	sub muladd($$$) {
		942	$_[2]->muladd ($_[0], $_[1])
707	}	943	}
708		944
709	=item blur $radius, $img	945	=item blur $radius, $img
710		946
711	=item blur $radius_horz, $radius_vert, $img	947	=item blur $radius_horz, $radius_vert, $img
…		…
723	sub blur($$;$) {	959	sub blur($$;$) {
724	my $img = pop;	960	my $img = pop;
725	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])	961	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
726	}	962	}
727		963
728	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees	964	=item focus_fade $img
729		965
730	Rotates the image by C<$degrees> degrees, counter-clockwise, around the	966	=item focus_fade $factor, $img
731	pointer at C<$center_x> and C<$center_y> (specified as factor of image
732	width/height), generating a new image with width C<$new_width> and height
733	C<$new_height>.
734		967
735	#TODO# new width, height, maybe more operators?	968	=item focus_fade $factor, $color, $img
736		969
737	Example: rotate the image by 90 degrees	970	Fades the image by the given factor (and colour) when focus is lost (the
		971	same as the C<-fade>/C<-fadecolor> command line options, which also supply
		972	the default values for C<factor> and C<$color>. Unlike with C<-fade>, the
		973	C<$factor> is a real value, not a percentage value (that is, 0..1, not
		974	0..100).
738		975
739	=cut	976	Example: do the right thing when focus fading is requested.
740		977
741	sub rotate($$$$$$) {	978	focus_fade load "mybg.jpg";
		979
		980	=cut
		981
		982	sub focus_fade($;$$) {
742	my $img = pop;	983	my $img = pop;
743	$img->rotate (	984
744	$_[0],	985	return $img
745	$_[1],	986	if FOCUS;
746	$_[2] * $img->w,	987
747	$_[3] * $img->h,	988	my $fade = @_ >= 1 ? $_[0] : defined $self->resource ("fade") ? $self->resource ("fade") * 0.01 : 0;
748	$_[4] * (3.14159265 / 180),	989	my $color = @_ >= 2 ? $_[1] : $self->resource ("color+" . urxvt::Color_fade);
749	)	990
		991	$img = $img->tint ($color) if $color ne "rgb:00/00/00";
		992	$img = $img->muladd (1 - $fade, 0) if $fade;
		993
		994	$img
750	}	995	}
751		996
752	=back	997	=back
753		998
		999	=head2 OTHER STUFF
		1000
		1001	Anything that didn't fit any of the other categories, even after applying
		1002	force and closing our eyes.
		1003
		1004	=over 4
		1005
		1006	=item keep { ... }
		1007
		1008	This operator takes a code block as argument, that is, one or more
		1009	statements enclosed by braces.
		1010
		1011	The trick is that this code block is only evaluated when the outcome
		1012	changes - on other calls the C<keep> simply returns the image it computed
		1013	previously (yes, it should only be used with images). Or in other words,
		1014	C<keep> I<caches> the result of the code block so it doesn't need to be
		1015	computed again.
		1016
		1017	This can be extremely useful to avoid redoing slow operations - for
		1018	example, if your background expression takes the root background, blurs it
		1019	and then root-aligns it it would have to blur the root background on every
		1020	window move or resize.
		1021
		1022	Another example is C<load>, which can be quite slow.
		1023
		1024	In fact, urxvt itself encloses the whole expression in some kind of
		1025	C<keep> block so it only is reevaluated as required.
		1026
		1027	Putting the blur into a C<keep> block will make sure the blur is only done
		1028	once, while the C<rootalign> is still done each time the window moves.
		1029
		1030	rootalign keep { blur 10, root }
		1031
		1032	This leaves the question of how to force reevaluation of the block,
		1033	in case the root background changes: If expression inside the block
		1034	is sensitive to some event (root background changes, window geometry
		1035	changes), then it will be reevaluated automatically as needed.
		1036
		1037	=back
		1038
		1039	=head1 OLD BACKGROUND IMAGE SETTINGS
		1040
		1041	This extension also provides support for the old options/resources and
		1042	OSC sequences for setting a background image. These settings are
		1043	B<deprecated> and will be removed in future versions.
		1044
		1045	=head2 OPTIONS AND RESOURCES
		1046
		1047	=over 4
		1048
		1049	=item B<-pixmap> I<file[;oplist]>
		1050
		1051	=item B<backgroundPixmap:> I<file[;oplist]>
		1052
		1053	Use the specified image file as the window's background and also
		1054	optionally specify a colon separated list of operations to modify it.
		1055	Note that you may need to quote the C<;> character when using the
		1056	command line option, as C<;> is usually a metacharacter in shells.
		1057	Supported operations are:
		1058
		1059	=over 4
		1060
		1061	=item B<WxH+X+Y>
		1062
		1063	sets scale and position. B<"W" / "H"> specify the horizontal/vertical
		1064	scale (percent), and B<"X" / "Y"> locate the image centre (percent). A
		1065	scale of 0 disables scaling.
		1066
		1067	=item B<op=tile>
		1068
		1069	enables tiling
		1070
		1071	=item B<op=keep-aspect>
		1072
		1073	maintain the image aspect ratio when scaling
		1074
		1075	=item B<op=root-align>
		1076
		1077	use the position of the terminal window relative to the root window as
		1078	the image offset, simulating a root window background
		1079
		1080	=back
		1081
		1082	The default scale and position setting is C<100x100+50+50>.
		1083	Alternatively, a predefined set of templates can be used to achieve
		1084	the most common setups:
		1085
		1086	=over 4
		1087
		1088	=item B<style=tiled>
		1089
		1090	the image is tiled with no scaling. Equivalent to 0x0+0+0:op=tile
		1091
		1092	=item B<style=aspect-stretched>
		1093
		1094	the image is scaled to fill the whole window maintaining the aspect
		1095	ratio and centered. Equivalent to 100x100+50+50:op=keep-aspect
		1096
		1097	=item B<style=stretched>
		1098
		1099	the image is scaled to fill the whole window. Equivalent to 100x100
		1100
		1101	=item B<style=centered>
		1102
		1103	the image is centered with no scaling. Equivalent to 0x0+50+50
		1104
		1105	=item B<style=root-tiled>
		1106
		1107	the image is tiled with no scaling and using 'root' positioning.
		1108	Equivalent to 0x0:op=tile:op=root-align
		1109
		1110	=back
		1111
		1112	If multiple templates are specified the last one wins. Note that a
		1113	template overrides all the scale, position and operations settings.
		1114
		1115	If used in conjunction with pseudo-transparency, the specified image
		1116	will be blended over the transparent background using alpha-blending.
		1117
		1118	=item B<-tr>\|B<+tr>
		1119
		1120	=item B<transparent:> I<boolean>
		1121
		1122	Turn on/off pseudo-transparency by using the root pixmap as background.
		1123
		1124	=item B<-tint> I<colour>
		1125
		1126	=item B<tintColor:> I<colour>
		1127
		1128	Tint the transparent background with the given colour. Note that a
		1129	black tint yields a completely black image while a white tint yields
		1130	the image unchanged.
		1131
		1132	=item B<-sh> I<number>
		1133
		1134	=item B<shading:> I<number>
		1135
		1136	Darken (0 .. 99) or lighten (101 .. 200) the transparent background.
		1137	A value of 100 means no shading.
		1138
		1139	=item B<-blr> I<HxV>
		1140
		1141	=item B<blurRadius:> I<HxV>
		1142
		1143	Apply gaussian blur with the specified radius to the transparent
		1144	background. If a single number is specified, the vertical and
		1145	horizontal radii are considered to be the same. Setting one of the
		1146	radii to 1 and the other to a large number creates interesting effects
		1147	on some backgrounds. The maximum radius value is 128. An horizontal or
		1148	vertical radius of 0 disables blurring.
		1149
		1150	=back
		1151
		1152	=head2 OSC sequences
		1153
		1154	=over 4
		1155
		1156	=item B<< C<ESC ] 705 ; Pt ST> >> Change transparent background tint colour to B<< C<Pt> >>.
		1157
		1158	=item B<< C<ESC ] 20 ; Pt ST> >> Change/Query background image
		1159	parameters: the value of B<< C<Pt> >> can be one of the following
		1160	commands:
		1161
		1162	=over 4
		1163
		1164	=item B<< C<?> >>
		1165
		1166	display scale and position in the title
		1167
		1168	=item B<< C<;WxH+X+Y> >>
		1169
		1170	change scale and/or position
		1171
		1172	=item B<< C<FILE;WxH+X+Y> >>
		1173
		1174	change background image
		1175
		1176	=back
		1177
		1178	=cut
		1179
		1180	sub keep(&) {
		1181	my $id = $_[0]+0;
		1182
		1183	local $frame = $self->{frame_cache}{$id} \|\|= [$frame];
		1184
		1185	unless ($frame->[FR_CACHE]) {
		1186	$frame->[FR_CACHE] = [ $_[0]() ];
		1187
		1188	my $self = $self;
		1189	my $frame = $frame;
		1190	Scalar::Util::weaken $frame;
		1191	$self->compile_frame ($frame, sub {
		1192	# clear this frame cache, also for all parents
		1193	for (my $frame = $frame; $frame; $frame = $frame->[0]) {
		1194	undef $frame->[FR_CACHE];
		1195	}
		1196
		1197	$self->recalculate;
		1198	});
		1199	};
		1200
		1201	# in scalar context we always return the first original result, which
		1202	# is not quite how perl works.
		1203	wantarray
		1204	? @{ $frame->[FR_CACHE] }
		1205	: $frame->[FR_CACHE][0]
		1206	}
		1207
		1208	# sub keep_clear() {
		1209	# delete $self->{frame_cache};
		1210	# }
		1211
		1212	=back
		1213
754	=cut	1214	=cut
755		1215
756	}	1216	}
757		1217
758	sub parse_expr {	1218	sub parse_expr {
759	my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}";	1219	my $expr = eval
		1220	"sub {\n"
		1221	. "package urxvt::bgdsl;\n"
		1222	. "#line 0 'background expression'\n"
		1223	. "$_[0]\n"
		1224	. "}";
760	die if $@;	1225	die if $@;
761	$expr	1226	$expr
762	}	1227	}
763		1228
764	# compiles a parsed expression	1229	# compiles a parsed expression
765	sub set_expr {	1230	sub set_expr {
766	my ($self, $expr) = @_;	1231	my ($self, $expr) = @_;
767		1232
		1233	$self->{root} = []; # the outermost frame
768	$self->{expr} = $expr;	1234	$self->{expr} = $expr;
769	$self->recalculate;	1235	$self->recalculate;
		1236	}
		1237
		1238	# takes a hash of sensitivity indicators and installs watchers
		1239	sub compile_frame {
		1240	my ($self, $frame, $cb) = @_;
		1241
		1242	my $state = $frame->[urxvt::bgdsl::FR_STATE] \|\|= {};
		1243	my $again = $frame->[urxvt::bgdsl::FR_AGAIN];
		1244
		1245	# don't keep stuff alive
		1246	Scalar::Util::weaken $state;
		1247
		1248	if ($again->{nested}) {
		1249	$state->{nested} = 1;
		1250	} else {
		1251	delete $state->{nested};
		1252	}
		1253
		1254	if (my $interval = $again->{time}) {
		1255	$state->{time} = [$interval, urxvt::timer->new->after ($interval)->interval ($interval)]
		1256	if $state->{time}[0] != $interval;
		1257
		1258	# callback might have changed, although we could just rule that out
		1259	$state->{time}[1]->cb (sub {
		1260	++$state->{counter};
		1261	$cb->();
		1262	});
		1263	} else {
		1264	delete $state->{time};
		1265	}
		1266
		1267	if ($again->{position}) {
		1268	$state->{position} = $self->on (position_change => $cb);
		1269	} else {
		1270	delete $state->{position};
		1271	}
		1272
		1273	if ($again->{size}) {
		1274	$state->{size} = $self->on (size_change => $cb);
		1275	} else {
		1276	delete $state->{size};
		1277	}
		1278
		1279	if ($again->{rootpmap}) {
		1280	$state->{rootpmap} = $self->on (rootpmap_change => $cb);
		1281	} else {
		1282	delete $state->{rootpmap};
		1283	}
		1284
		1285	if ($again->{focus}) {
		1286	$state->{focus} = $self->on (focus_in => $cb, focus_out => $cb);
		1287	} else {
		1288	delete $state->{focus};
		1289	}
770	}	1290	}
771		1291
772	# evaluate the current bg expression	1292	# evaluate the current bg expression
773	sub recalculate {	1293	sub recalculate {
774	my ($arg_self) = @_;	1294	my ($arg_self) = @_;
…		…
784		1304
785	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;	1305	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;
786		1306
787	# set environment to evaluate user expression	1307	# set environment to evaluate user expression
788		1308
789	local $self = $arg_self;	1309	local $self = $arg_self;
790
791	local $HOME = $ENV{HOME};	1310	local $HOME = $ENV{HOME};
792	local $old = $self->{state};	1311	local $frame = $self->{root};
793	local $new = my $state = $self->{state} = {};
794		1312
795	($x, $y, $w, $h) =
796	$self->background_geometry ($self->{border});	1313	($x, $y, $w, $h) = $self->background_geometry ($self->{border});
		1314	$focus = $self->focus;
797		1315
798	# evaluate user expression	1316	# evaluate user expression
799		1317
800	my $img = eval { $self->{expr}->() };	1318	my @img = eval { $self->{expr}->() };
801	warn $@ if $@;#d#	1319	die $@ if $@;
802	die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img";	1320	die "background-expr did not return anything.\n" unless @img;
		1321	die "background-expr: expected image(s), got something else.\n"
		1322	if grep { !UNIVERSAL::isa $_, "urxvt::img" } @img;
803		1323
804	$state->{size_sensitive} = 1	1324	my $img = urxvt::bgdsl::merge @img;
		1325
		1326	$frame->[FR_AGAIN]{size} = 1
805	if $img->repeat_mode != urxvt::RepeatNormal;	1327	if $img->repeat_mode != urxvt::RepeatNormal;
806		1328
807	# if the expression is sensitive to external events, prepare reevaluation then	1329	# if the expression is sensitive to external events, prepare reevaluation then
808		1330	$self->compile_frame ($frame, sub { $arg_self->recalculate });
809	my $repeat;
810
811	if (my $again = $state->{again}) {
812	$repeat = 1;
813	my $self = $self;
814	$state->{timer} = $again == $old->{again}
815	? $old->{timer}
816	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
817	++$self->{counter};
818	$self->recalculate
819	});
820	}
821
822	if (delete $state->{position_sensitive}) {
823	$repeat = 1;
824	$self->enable (position_change => sub { $_[0]->recalculate });
825	} else {
826	$self->disable ("position_change");
827	}
828
829	if (delete $state->{size_sensitive}) {
830	$repeat = 1;
831	$self->enable (size_change => sub { $_[0]->recalculate });
832	} else {
833	$self->disable ("size_change");
834	}
835
836	if (delete $state->{rootpmap_sensitive}) {
837	$repeat = 1;
838	$self->enable (rootpmap_change => sub { $_[0]->recalculate });
839	} else {
840	$self->disable ("rootpmap_change");
841	}
842		1331
843	# clear stuff we no longer need	1332	# clear stuff we no longer need
844		1333
845	%$old = ();	1334	# unless (%{ $frame->[FR_STATE] }) {
846
847	unless ($repeat) {
848	delete $self->{state};	1335	# delete $self->{state};
849	delete $self->{expr};	1336	# delete $self->{expr};
850	}	1337	# }
851		1338
852	# set background pixmap	1339	# set background pixmap
853		1340
854	$self->set_background ($img, $self->{border});	1341	$self->set_background ($img, $self->{border});
855	$self->scr_recolour (0);	1342	$self->scr_recolor (0);
856	$self->want_refresh;	1343	$self->want_refresh;
857	}	1344	}
858		1345
		1346	sub old_bg_opts {
		1347	my ($self, $arg) = @_;
		1348
		1349	$arg or return;
		1350
		1351	my @str = split /;/, $arg;
		1352
		1353	return unless $str[0] or $self->{bg_opts}->{path};
		1354
		1355	my $bg_opts = $self->{bg_opts};
		1356
		1357	if ($str[0]) {
		1358	$bg_opts->{tile} = 0;
		1359	$bg_opts->{keep_aspect} = 0;
		1360	$bg_opts->{root_align} = 0;
		1361	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 100;
		1362	$bg_opts->{h_align} = $bg_opts->{v_align} = 50;
		1363	$bg_opts->{path} = unpack "H*", $str[0];
		1364	}
		1365
		1366	my @oplist = split /:/, $str[1];
		1367
		1368	for (@oplist) {
		1369	if (/style=tiled/i) {
		1370	$bg_opts->{tile} = 1;
		1371	$bg_opts->{keep_aspect} = 0;
		1372	$bg_opts->{root_align} = 0;
		1373	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 0;
		1374	$bg_opts->{h_align} = $bg_opts->{v_align} = 0;
		1375	} elsif (/style=aspect-stretched/i) {
		1376	$bg_opts->{tile} = 0;
		1377	$bg_opts->{keep_aspect} = 1;
		1378	$bg_opts->{root_align} = 0;
		1379	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 100;
		1380	$bg_opts->{h_align} = $bg_opts->{v_align} = 50;
		1381	} elsif (/style=stretched/i) {
		1382	$bg_opts->{tile} = 0;
		1383	$bg_opts->{keep_aspect} = 0;
		1384	$bg_opts->{root_align} = 0;
		1385	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 100;
		1386	$bg_opts->{h_align} = $bg_opts->{v_align} = 50;
		1387	} elsif (/style=centered/i) {
		1388	$bg_opts->{tile} = 0;
		1389	$bg_opts->{keep_aspect} = 0;
		1390	$bg_opts->{root_align} = 0;
		1391	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 0;
		1392	$bg_opts->{h_align} = $bg_opts->{v_align} = 50;
		1393	} elsif (/style=root-tiled/i) {
		1394	$bg_opts->{tile} = 1;
		1395	$bg_opts->{keep_aspect} = 0;
		1396	$bg_opts->{root_align} = 1;
		1397	$bg_opts->{h_scale} = $bg_opts->{v_scale} = 0;
		1398	$bg_opts->{h_align} = $bg_opts->{v_align} = 0;
		1399	} elsif (/op=tile/i) {
		1400	$bg_opts->{tile} = 1;
		1401	} elsif (/op=keep_aspect/i) {
		1402	$bg_opts->{keep_aspect} = 1;
		1403	} elsif (/op=root_align/i) {
		1404	$bg_opts->{root_align} = 1;
		1405	} elsif (/^ =? ([0-9]+)? (?:[xX] ([0-9]+))? ([+-][0-9]+)? ([+-][0-9]+)? $/x) {
		1406	my ($w, $h, $x, $y) = ($1, $2, $3, $4);
		1407
		1408	if ($str[0]) {
		1409	$w = $h unless defined $w;
		1410	$h = $w unless defined $h;
		1411	$y = $x unless defined $y;
		1412	}
		1413
		1414	$bg_opts->{h_scale} = $w if defined $w;
		1415	$bg_opts->{v_scale} = $h if defined $h;
		1416	$bg_opts->{h_align} = $x if defined $x;
		1417	$bg_opts->{v_align} = $y if defined $y;
		1418	}
		1419	}
		1420	}
		1421
		1422	sub old_bg_expr {
		1423	my ($self) = @_;
		1424
		1425	my $expr;
		1426
		1427	my $bg_opts = $self->{bg_opts};
		1428
		1429	if ($bg_opts->{root}) {
		1430	$expr .= "tile (";
		1431
		1432	my $shade = $bg_opts->{shade};
		1433
		1434	if ($shade) {
		1435	$shade = List::Util::min $shade, 200;
		1436	$shade = List::Util::max $shade, -100;
		1437	$shade = 200 - (100 + $shade) if $shade < 0;
		1438
		1439	$shade = $shade * 0.01 - 1;
		1440	$expr .= "shade $shade, ";
		1441	}
		1442
		1443	my $tint = $bg_opts->{tint};
		1444
		1445	if ($tint) {
		1446	$expr .= "tint $tint, ";
		1447	}
		1448
		1449	my $blur = $bg_opts->{blur};
		1450
		1451	if ($blur and $blur =~ /^ =? ([0-9]+)? (?:[xX] ([0-9]+))? $/x) {
		1452	my $hr = defined $1 ? $1 : 1;
		1453	my $vr = defined $2 ? $2 : $hr;
		1454
		1455	if ($hr != 0 and $vr != 0) {
		1456	$expr .= "blur $hr, $vr, ";
		1457	}
		1458	}
		1459
		1460	$expr .= "rootalign root)";
		1461	}
		1462
		1463	if ($bg_opts->{path}) {
		1464	my $file_expr;
		1465	my $h_scale = $bg_opts->{h_scale} * 0.01;
		1466	my $v_scale = $bg_opts->{v_scale} * 0.01;
		1467	my $h_align = $bg_opts->{h_align} * 0.01;
		1468	my $v_align = $bg_opts->{v_align} * 0.01;
		1469
		1470	if (!$bg_opts->{tile}) {
		1471	$file_expr .= "pad (";
		1472	} else {
		1473	$file_expr .= "tile (";
		1474	}
		1475
		1476	if ($bg_opts->{root_align}) {
		1477	$file_expr .= "rootalign ";
		1478	} else {
		1479	$file_expr .= "align $h_align, $v_align, ";
		1480	}
		1481
		1482	if ($h_scale != 0 and $v_scale != 0) {
		1483	my $op = $bg_opts->{keep_aspect} ? "fit" : "resize";
		1484	$file_expr .= "$op TW * $h_scale, TH * $v_scale, ";
		1485	}
		1486
		1487	$file_expr .= "keep { load pack \"H*\", \"$bg_opts->{path}\" })";
		1488
		1489	if ($expr) {
		1490	$expr .= ", tint (\"[50]white\", $file_expr)";
		1491	} else {
		1492	$expr = $file_expr;
		1493	}
		1494	}
		1495
		1496	$expr
		1497	}
		1498
		1499	sub on_osc_seq {
		1500	my ($self, $op, $arg) = @_;
		1501
		1502	$self->{bg_opts} or return;
		1503
		1504	$op =~ /^(20\|705)$/ or return;
		1505
		1506	if ($op eq "20") {
		1507	if ($arg eq "?") {
		1508	my $h_scale = $self->{bg_opts}->{h_scale};
		1509	my $v_scale = $self->{bg_opts}->{v_scale};
		1510	my $h_align = $self->{bg_opts}->{h_align};
		1511	my $v_align = $self->{bg_opts}->{v_align};
		1512	$self->cmd_parse ("\033]2;[${h_scale}x${v_scale}+${h_align}+${v_align}]\007");
		1513	} else {
		1514	$self->old_bg_opts ($arg);
		1515	my $expr = $self->old_bg_expr;
		1516	$self->set_expr (parse_expr $expr) if $expr;
		1517	}
		1518	} elsif ($op eq "705") {
		1519	$self->{bg_opts}->{tint} = $arg;
		1520	my $expr = $self->old_bg_expr;
		1521	$self->set_expr (parse_expr $expr) if $expr;
		1522	}
		1523
		1524	1
		1525	}
		1526
		1527	sub find_resource {
		1528	my ($self, $a, $b) = @_;
		1529
		1530	my $v = $self->x_resource ($a);
		1531	$v = $self->x_resource ($b) unless defined $v;
		1532
		1533	$v
		1534	}
		1535
859	sub on_start {	1536	sub on_start {
860	my ($self) = @_;	1537	my ($self) = @_;
861		1538
862	my $expr = $self->x_resource ("%.expr")	1539	my $expr = $self->x_resource ("%.expr");
		1540
		1541	if (!$expr) {
		1542	$self->{bg_opts} = { h_scale => 100, v_scale => 100,
		1543	h_align => 50, v_align => 50 };
		1544
		1545	$self->{bg_opts}->{shade} = $self->find_resource ("shading", "sh");
		1546	$self->{bg_opts}->{tint} = $self->find_resource ("tintColor", "tint");
		1547	$self->{bg_opts}->{blur} = $self->find_resource ("blurRadius", "blr");
		1548	if ($self->x_resource_boolean ("transparent")
		1549	or $self->x_resource_boolean ("tr")) {
		1550	$self->{bg_opts}->{root} = 1;
		1551	}
		1552
		1553	$self->old_bg_opts ($self->find_resource ("backgroundPixmap", "pixmap"));
		1554	$expr = $self->old_bg_expr;
		1555	}
		1556
863	or return;	1557	$expr or return;
864		1558
865	$self->has_render	1559	$self->has_render
866	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";	1560	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";
867		1561
868	$self->set_expr (parse_expr $expr);	1562	$self->set_expr (parse_expr $expr);

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.49 by root, Sun Jun 10 15:29:18 2012 UTC vs. Revision 1.92 by sf-exg, Thu Jul 14 05:33:26 2016 UTC

Diff Legend

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.49 by root, Sun Jun 10 15:29:18 2012 UTC vs.
Revision 1.92 by sf-exg, Thu Jul 14 05:33:26 2016 UTC