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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.38 by root, Fri Jun 8 21:48:07 2012 UTC vs.
Revision 1.75 by root, Fri Aug 10 20:07:11 2012 UTC

…		…
1	#! perl	1	#! perl
2		2
3	#:META:X_RESOURCE:%.expr:string:background expression	3	#:META:X_RESOURCE:%.expr:string:background expression
4	#:META:X_RESOURCE:%.border.:boolean:respect the terminal border	4	#:META:X_RESOURCE:%.border:boolean:respect the terminal border
		5	#:META:X_RESOURCE:%.interval:seconds:minimum time between updates
5		6
6	#TODO: once, rootalign	7	=head1 NAME
7		8
8	=head1 background - manage terminal background	9	background - manage terminal background
9		10
10	=head2 SYNOPSIS	11	=head1 SYNOPSIS
11		12
12	urxvt --background-expr 'background expression'	13	urxvt --background-expr 'background expression'
13	--background-border	14	--background-border
		15	--background-interval seconds
14		16
		17	=head1 QUICK AND DIRTY CHEAT SHEET
		18
		19	Just load a random jpeg image and tile the background with it without
		20	scaling or anything else:
		21
		22	load "/path/to/img.jpg"
		23
		24	The same, but use mirroring/reflection instead of tiling:
		25
		26	mirror load "/path/to/img.jpg"
		27
		28	Load an image and scale it to exactly fill the terminal window:
		29
		30	scale keep { load "/path/to/img.jpg" }
		31
		32	Implement pseudo-transparency by using a suitably-aligned root pixmap
		33	as window background:
		34
		35	rootalign root
		36
		37	Likewise, but keep a blurred copy:
		38
		39	rootalign keep { blur 10, root }
		40
15	=head2 DESCRIPTION	41	=head1 DESCRIPTION
16		42
17	This extension manages the terminal background by creating a picture that	43	This extension manages the terminal background by creating a picture that
18	is behind the text, replacing the normal background colour.	44	is behind the text, replacing the normal background colour.
19		45
20	It does so by evaluating a Perl expression that I<calculates> the image on	46	It does so by evaluating a Perl expression that I<calculates> the image on
24	to be as simple as possible.	50	to be as simple as possible.
25		51
26	For example, to load an image and scale it to the window size, you would	52	For example, to load an image and scale it to the window size, you would
27	use:	53	use:
28		54
29	urxvt --background-expr 'scale load "/path/to/mybg.png"'	55	urxvt --background-expr 'scale keep { load "/path/to/mybg.png" }'
30		56
31	Or specified as a X resource:	57	Or specified as a X resource:
32		58
33	URxvt.background-expr: scale load "/path/to/mybg.png"	59	URxvt.background-expr: scale keep { load "/path/to/mybg.png" }
34		60
35	=head2 THEORY OF OPERATION	61	=head1 THEORY OF OPERATION
36		62
37	At startup, just before the window is mapped for the first time, the	63	At startup, just before the window is mapped for the first time, the
38	expression is evaluated and must yield an image. The image is then	64	expression is evaluated and must yield an image. The image is then
39	extended as necessary to cover the whole terminal window, and is set as a	65	extended as necessary to cover the whole terminal window, and is set as a
40	background pixmap.	66	background pixmap.
…		…
51	If any of the parameters that the expression relies on changes (when the	77	If any of the parameters that the expression relies on changes (when the
52	window is moved or resized, its position or size changes; when the root	78	window is moved or resized, its position or size changes; when the root
53	pixmap is replaced by another one the root background changes; or when the	79	pixmap is replaced by another one the root background changes; or when the
54	timer elapses), then the expression will be evaluated again.	80	timer elapses), then the expression will be evaluated again.
55		81
56	For example, an expression such as C<scale load "$HOME/mybg.png"> scales the	82	For example, an expression such as C<scale keep { load "$HOME/mybg.png"
57	image to the window size, so it relies on the window size and will	83	}> scales the image to the window size, so it relies on the window size
58	be reevaluated each time it is changed, but not when it moves for	84	and will be reevaluated each time it is changed, but not when it moves for
59	example. That ensures that the picture always fills the terminal, even	85	example. That ensures that the picture always fills the terminal, even
60	after it's size changes.	86	after its size changes.
61		87
62	=head3 EXPRESSIONS	88	=head2 EXPRESSIONS
63		89
64	Expressions are normal Perl expressions, in fact, they are Perl blocks -	90	Expressions are normal Perl expressions, in fact, they are Perl blocks -
65	which means you could use multiple lines and statements:	91	which means you could use multiple lines and statements:
66		92
		93	scale keep {
67	again 3600;	94	again 3600;
68	if (localtime now)[6]) {	95	if (localtime now)[6]) {
69	return scale load "$HOME/weekday.png";	96	return load "$HOME/weekday.png";
70	} else {	97	} else {
71	return scale load "$HOME/sunday.png";	98	return load "$HOME/sunday.png";
		99	}
72	}	100	}
73		101
74	This expression gets evaluated once per hour. It will set F<sunday.png> as	102	This inner expression is evaluated once per hour (and whenever the
		103	terminal window is resized). It sets F<sunday.png> as background on
75	background on sundays, and F<weekday.png> on all other days.	104	Sundays, and F<weekday.png> on all other days.
76		105
77	Fortunately, we expect that most expressions will be much simpler, with	106	Fortunately, we expect that most expressions will be much simpler, with
78	little Perl knowledge needed.	107	little Perl knowledge needed.
79		108
80	Basically, you always start with a function that "generates" an image	109	Basically, you always start with a function that "generates" an image
…		…
97	its result becomes the argument to the C<scale> function.	126	its result becomes the argument to the C<scale> function.
98		127
99	Many operators also allow some parameters preceding the input image	128	Many operators also allow some parameters preceding the input image
100	that modify its behaviour. For example, C<scale> without any additional	129	that modify its behaviour. For example, C<scale> without any additional
101	arguments scales the image to size of the terminal window. If you specify	130	arguments scales the image to size of the terminal window. If you specify
102	an additional argument, it uses it as a percentage:	131	an additional argument, it uses it as a scale factor (multiply by 100 to
		132	get a percentage):
103		133
104	scale 200, load "$HOME/mypic.png"	134	scale 2, load "$HOME/mypic.png"
105		135
106	This enlarges the image by a factor of 2 (200%). As you can see, C<scale>	136	This enlarges the image by a factor of 2 (200%). As you can see, C<scale>
107	has now two arguments, the C<200> and the C<load> expression, while	137	has now two arguments, the C<200> and the C<load> expression, while
108	C<load> only has one argument. Arguments are separated from each other by	138	C<load> only has one argument. Arguments are separated from each other by
109	commas.	139	commas.
110		140
111	Scale also accepts two arguments, which are then separate factors for both	141	Scale also accepts two arguments, which are then separate factors for both
112	horizontal and vertical dimensions. For example, this halves the image	142	horizontal and vertical dimensions. For example, this halves the image
113	width and doubles the image height:	143	width and doubles the image height:
114		144
115	scale 50, 200, load "$HOME/mypic.png"	145	scale 0.5, 2, load "$HOME/mypic.png"
116		146
117	TODO	147	IF you try out these expressions, you might suffer from some sluggishness,
		148	because each time the terminal is resized, it loads the PNG image again
		149	and scales it. Scaling is usually fast (and unavoidable), but loading the
		150	image can be quite time consuming. This is where C<keep> comes in handy:
118		151
119	=head3 CYCLES AND CACHING	152	scale 0.5, 2, keep { load "$HOME/mypic.png" }
120		153
121	TODO	154	The C<keep> operator executes all the statements inside the braces only
		155	once, or when it thinks the outcome might change. In other cases it
		156	returns the last value computed by the brace block.
122		157
123	Each time the expression is reevaluated, a new cycle is said to have begun. Many operators	158	This means that the C<load> is only executed once, which makes it much
124	cache their results till the next cycle. For example	159	faster, but also means that more memory is being used, because the loaded
		160	image must be kept in memory at all times. In this expression, the
		161	trade-off is likely worth it.
125		162
		163	But back to effects: Other effects than scaling are also readily
		164	available, for example, you can tile the image to fill the whole window,
		165	instead of resizing it:
		166
		167	tile keep { load "$HOME/mypic.png" }
		168
		169	In fact, images returned by C<load> are in C<tile> mode by default, so the
		170	C<tile> operator is kind of superfluous.
		171
		172	Another common effect is to mirror the image, so that the same edges
		173	touch:
		174
		175	mirror keep { load "$HOME/mypic.png" }
		176
		177	Another common background expression is:
		178
		179	rootalign root
		180
		181	This one first takes a snapshot of the screen background image, and then
		182	moves it to the upper left corner of the screen (as opposed to the upper
		183	left corner of the terminal window)- the result is pseudo-transparency:
		184	the image seems to be static while the window is moved around.
		185
		186	=head2 COLOUR SPECIFICATIONS
		187
		188	Whenever an operator expects a "colour", then this can be specified in one
		189	of two ways: Either as string with an X11 colour specification, such as:
		190
		191	"red" # named colour
		192	"#f00" # simple rgb
		193	"[50]red" # red with 50% alpha
		194	"TekHVC:300/50/50" # anything goes
		195
		196	OR as an array reference with one, three or four components:
		197
		198	[0.5] # 50% gray, 100% alpha
		199	[0.5, 0, 0] # dark red, no green or blur, 100% alpha
		200	[0.5, 0, 0, 0.7] # same with explicit 70% alpha
		201
		202	=head2 CACHING AND SENSITIVITY
		203
		204	Since some operations (such as C<load> and C<blur>) can take a long time,
		205	caching results can be very important for a smooth operation. Caching can
		206	also be useful to reduce memory usage, though, for example, when an image
		207	is cached by C<load>, it could be shared by multiple terminal windows
		208	running inside urxvtd.
		209
		210	=head3 C<keep { ... }> caching
		211
		212	The most important way to cache expensive operations is to use C<keep {
		213	... }>. The C<keep> operator takes a block of multiple statements enclosed
		214	by C<{}> and keeps the return value in memory.
		215
		216	An expression can be "sensitive" to various external events, such as
		217	scaling or moving the window, root background changes and timers. Simply
		218	using an expression (such as C<scale> without parameters) that depends on
		219	certain changing values (called "variables"), or using those variables
		220	directly, will make an expression sensitive to these events - for example,
		221	using C<scale> or C<TW> will make the expression sensitive to the terminal
		222	size, and thus to resizing events.
		223
		224	When such an event happens, C<keep> will automatically trigger a
		225	reevaluation of the whole expression with the new value of the expression.
		226
		227	C<keep> is most useful for expensive operations, such as C<blur>:
		228
		229	rootalign keep { blur 20, root }
		230
		231	This makes a blurred copy of the root background once, and on subsequent
		232	calls, just root-aligns it. Since C<blur> is usually quite slow and
		233	C<rootalign> is quite fast, this trades extra memory (for the cached
		234	blurred pixmap) with speed (blur only needs to be redone when root
		235	changes).
		236
		237	=head3 C<load> caching
		238
		239	The C<load> operator itself does not keep images in memory, but as long as
		240	the image is still in memory, C<load> will use the in-memory image instead
		241	of loading it freshly from disk.
		242
		243	That means that this expression:
		244
		245	keep { load "$HOME/path..." }
		246
		247	Not only caches the image in memory, other terminal instances that try to
		248	C<load> it can reuse that in-memory copy.
		249
126	=head2 REFERENCE	250	=head1 REFERENCE
127		251
128	=head3 COMMAND LINE SWITCHES	252	=head2 COMMAND LINE SWITCHES
129		253
130	=over 4	254	=over 4
131		255
132	=item --background-expr perl-expression	256	=item --background-expr perl-expression
133		257
…		…
139	overwriting borders and any other areas, such as the scrollbar.	263	overwriting borders and any other areas, such as the scrollbar.
140		264
141	Specifying this flag changes the behaviour, so that the image only	265	Specifying this flag changes the behaviour, so that the image only
142	replaces the background of the character area.	266	replaces the background of the character area.
143		267
		268	=item --background-interval seconds
		269
		270	Since some operations in the underlying XRender extension can effectively
		271	freeze your X-server for prolonged time, this extension enforces a minimum
		272	time between updates, which is normally about 0.1 seconds.
		273
		274	If you want to do updates more often, you can decrease this safety
		275	interval with this switch.
		276
144	=back	277	=back
145		278
146	=cut	279	=cut
147		280
148	our $EXPR;#d#	281	our %_IMG_CACHE;
149	#$EXPR = 'move W * 0.1, -H * 0.1, resize W * 0.5, H * 0.5, repeat_none load "opensource.png"';
150	$EXPR = 'move -TX, -TY, load "argb.png"';
151	#$EXPR = '
152	# rotate W, H, 50, 50, counter 1/59.95, repeat_mirror,
153	# clip X, Y, W, H, repeat_mirror,
154	# load "/root/pix/das_fette_schwein.jpg"
155	#';
156	#$EXPR = 'solid "red"';
157	#$EXPR = 'blur root, 10, 10'
158	#$EXPR = 'blur move (root, -x, -y), 5, 5'
159	#resize load "/root/pix/das_fette_schwein.jpg", w, h
160
161	our $HOME;	282	our $HOME;
162	our ($self, $old, $new);	283	our ($self, $frame);
163	our ($x, $y, $w, $h);	284	our ($x, $y, $w, $h);
164		285
165	# enforce at least this interval between updates	286	# enforce at least this interval between updates
166	our $MIN_INTERVAL = 1/100;	287	our $MIN_INTERVAL = 6/59.951;
167		288
168	{	289	{
169	package urxvt::bgdsl; # background language	290	package urxvt::bgdsl; # background language
		291
		292	sub FR_PARENT() { 0 } # parent frame, if any - must be #0
		293	sub FR_CACHE () { 1 } # cached values
		294	sub FR_AGAIN () { 2 } # what this expr is sensitive to
		295	sub FR_STATE () { 3 } # watchers etc.
		296
		297	use List::Util qw(min max sum shuffle);
170		298
171	=head2 PROVIDERS/GENERATORS	299	=head2 PROVIDERS/GENERATORS
172		300
173	These functions provide an image, by loading it from disk, grabbing it	301	These functions provide an image, by loading it from disk, grabbing it
174	from the root screen or by simply generating it. They are used as starting	302	from the root screen or by simply generating it. They are used as starting
…		…
179	=item load $path	307	=item load $path
180		308
181	Loads the image at the given C<$path>. The image is set to plane tiling	309	Loads the image at the given C<$path>. The image is set to plane tiling
182	mode.	310	mode.
183		311
184	Loaded images will be cached for one cycle.	312	If the image is already in memory (e.g. because another terminal instance
		313	uses it), then the in-memory copy us returned instead.
185		314
		315	=item load_uc $path
		316
		317	Load uncached - same as load, but does not cache the image, which means it
		318	is I<always> loaded from the filesystem again, even if another copy of it
		319	is in memory at the time.
		320
186	=cut	321	=cut
		322
		323	sub load_uc($) {
		324	$self->new_img_from_file ($_[0])
		325	}
187		326
188	sub load($) {	327	sub load($) {
189	my ($path) = @_;	328	my ($path) = @_;
190		329
191	$new->{load}{$path} = $old->{load}{$path} \|\| $self->new_img_from_file ($path);	330	$_IMG_CACHE{$path} \|\| do {
		331	my $img = load_uc $path;
		332	Scalar::Util::weaken ($_IMG_CACHE{$path} = $img);
		333	$img
		334	}
192	}	335	}
193		336
194	=item root	337	=item root
195		338
196	Returns the root window pixmap, that is, hopefully, the background image	339	Returns the root window pixmap, that is, hopefully, the background image
197	of your screen. The image is set to extend mode.	340	of your screen.
198		341
199	This function makes your expression root sensitive, that means it will be	342	This function makes your expression root sensitive, that means it will be
200	reevaluated when the bg image changes.	343	reevaluated when the bg image changes.
201		344
202	=cut	345	=cut
203		346
204	sub root() {	347	sub root() {
205	$new->{rootpmap_sensitive} = 1;	348	$frame->[FR_AGAIN]{rootpmap} = 1;
206	die "root op not supported, exg, we need you";	349	$self->new_img_from_root
207	}	350	}
208		351
209	=item solid $colour	352	=item solid $colour
210		353
211	=item solid $width, $height, $colour	354	=item solid $width, $height, $colour
212		355
213	Creates a new image and completely fills it with the given colour. The	356	Creates a new image and completely fills it with the given colour. The
214	image is set to tiling mode.	357	image is set to tiling mode.
215		358
216	If <$width> and C<$height> are omitted, it creates a 1x1 image, which is	359	If C<$width> and C<$height> are omitted, it creates a 1x1 image, which is
217	useful for solid backgrounds or for use in filtering effects.	360	useful for solid backgrounds or for use in filtering effects.
218		361
219	=cut	362	=cut
220		363
221	sub solid($$;$) {	364	sub solid($;$$) {
222	my $colour = pop;	365	my $colour = pop;
223		366
224	my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] \|\| 1, $_[1] \|\| 1);	367	my $img = $self->new_img (urxvt::PictStandardARGB32, 0, 0, $_[0] \|\| 1, $_[1] \|\| 1);
225	$img->fill ($colour);	368	$img->fill ($colour);
226	$img	369	$img
227	}	370	}
228		371
229	=back	372	=item clone $img
230		373
231	=head2 VARIABLES	374	Returns an exact copy of the image. This is useful if you want to have
		375	multiple copies of the same image to apply different effects to.
232		376
233	The following functions provide variable data such as the terminal
234	window dimensions. Most of them make your expression sensitive to some
235	events, for example using C<TW> (terminal width) means your expression is
236	evaluated again when the terminal is resized.
237
238	=over 4
239
240	=item TX
241
242	=item TY
243
244	Return the X and Y coordinates of the terminal window (the terminal
245	window is the full window by default, and the character area only when in
246	border-respect mode).
247
248	Using these functions make your expression sensitive to window moves.
249
250	These functions are mainly useful to align images to the root window.
251
252	Example: load an image and align it so it looks as if anchored to the
253	background.
254
255	move -TX, -TY, load "mybg.png"
256
257	=item TW
258
259	Return the width (C<TW>) and height (C<TH>) of the terminal window (the
260	terminal window is the full window by default, and the character area only
261	when in border-respect mode).
262
263	Using these functions make your expression sensitive to window resizes.
264
265	These functions are mainly useful to scale images, or to clip images to
266	the window size to conserve memory.
267
268	Example: take the screen background, clip it to the window size, blur it a
269	bit, align it to the window position and use it as background.
270
271	clip move -TX, -TY, blur 5, root
272
273	=cut	377	=cut
274		378
275	sub TX() { $new->{position_sensitive} = 1; $x }
276	sub TY() { $new->{position_sensitive} = 1; $y }
277	sub TW() { $new->{size_sensitive} = 1; $w }
278	sub TH() { $new->{size_sensitive} = 1; $h }
279
280	=item now
281
282	Returns the current time as (fractional) seconds since the epoch.
283
284	Using this expression does I<not> make your expression sensitive to time,
285	but the next two functions do.
286
287	=item again $seconds
288
289	When this function is used the expression will be reevaluated again in
290	C<$seconds> seconds.
291
292	Example: load some image and rotate it according to the time of day (as if it were
293	the hour pointer of a clock). Update this image every minute.
294
295	again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"
296
297	=item counter $seconds
298
299	Like C<again>, but also returns an increasing counter value, starting at
300	0, which might be useful for some simple animation effects.
301
302	=cut
303
304	sub now() { urxvt::NOW }
305
306	sub again($) {
307	$new->{again} = $_[0];
308	}
309
310	sub counter($) {	379	sub clone($) {
311	$new->{again} = $_[0];	380	$_[0]->clone
312	$self->{counter} + 0
313	}	381	}
314		382
315	=back	383	=item merge $img ...
		384
		385	Takes any number of images and merges them together, creating a single
		386	image containing them all. The tiling mode of the first image is used as
		387	the tiling mode of the resulting image.
		388
		389	This function is called automatically when an expression returns multiple
		390	images.
		391
		392	=cut
		393
		394	sub merge(@) {
		395	return $_[0] unless $#_;
		396
		397	# rather annoyingly clumsy, but optimisation is for another time
		398
		399	my $x0 = +1e9;
		400	my $y0 = +1e9;
		401	my $x1 = -1e9;
		402	my $y1 = -1e9;
		403
		404	for (@_) {
		405	my ($x, $y, $w, $h) = $_->geometry;
		406
		407	$x0 = $x if $x0 > $x;
		408	$y0 = $y if $y0 > $y;
		409
		410	$x += $w;
		411	$y += $h;
		412
		413	$x1 = $x if $x1 < $x;
		414	$y1 = $y if $y1 < $y;
		415	}
		416
		417	my $base = $self->new_img (urxvt::PictStandardARGB32, $x0, $y0, $x1 - $x0, $y1 - $y0);
		418	$base->repeat_mode ($_[0]->repeat_mode);
		419	$base->fill ([0, 0, 0, 0]);
		420
		421	$base->draw ($_)
		422	for @_;
		423
		424	$base
		425	}
316		426
317	=head2 TILING MODES	427	=head2 TILING MODES
318		428
319	The following operators modify the tiling mode of an image, that is, the	429	The following operators modify the tiling mode of an image, that is, the
320	way that pixels outside the image area are painted when the image is used.	430	way that pixels outside the image area are painted when the image is used.
…		…
350	become transparent. This mode is most useful when you want to place an	460	become transparent. This mode is most useful when you want to place an
351	image over another image or the background colour while leaving all	461	image over another image or the background colour while leaving all
352	background pixels outside the image unchanged.	462	background pixels outside the image unchanged.
353		463
354	Example: load an image and display it in the upper left corner. The rest	464	Example: load an image and display it in the upper left corner. The rest
355	of the space is left "empty" (transparent or wahtever your compisotr does	465	of the space is left "empty" (transparent or whatever your compositor does
356	in alpha mode, else background colour).	466	in alpha mode, else background colour).
357		467
358	pad load "mybg.png"	468	pad load "mybg.png"
359		469
360	=item extend $img	470	=item extend $img
361		471
362	Extends the image over the whole plane, using the closest pixel in the	472	Extends the image over the whole plane, using the closest pixel in the
363	area outside the image. This mode is mostly useful when you more complex	473	area outside the image. This mode is mostly useful when you use more complex
364	filtering operations and want the pixels outside the image to have the	474	filtering operations and want the pixels outside the image to have the
365	same values as the pixels near the edge.	475	same values as the pixels near the edge.
366		476
367	Example: just for curiosity, how does this pixel extension stuff work?	477	Example: just for curiosity, how does this pixel extension stuff work?
368		478
…		…
394	$img	504	$img
395	}	505	}
396		506
397	=back	507	=back
398		508
399	=head2 PIXEL OPERATORS	509	=head2 VARIABLE VALUES
400		510
401	The following operators modify the image pixels in various ways.	511	The following functions provide variable data such as the terminal window
		512	dimensions. They are not (Perl-) variables, they just return stuff that
		513	varies. Most of them make your expression sensitive to some events, for
		514	example using C<TW> (terminal width) means your expression is evaluated
		515	again when the terminal is resized.
402		516
403	=over 4	517	=over 4
404		518
405	=item clone $img	519	=item TX
406		520
407	Returns an exact copy of the image.	521	=item TY
408		522
409	=cut	523	Return the X and Y coordinates of the terminal window (the terminal
		524	window is the full window by default, and the character area only when in
		525	border-respect mode).
410		526
		527	Using these functions make your expression sensitive to window moves.
		528
		529	These functions are mainly useful to align images to the root window.
		530
		531	Example: load an image and align it so it looks as if anchored to the
		532	background (that's exactly what C<rootalign> does btw.):
		533
		534	move -TX, -TY, keep { load "mybg.png" }
		535
		536	=item TW
		537
		538	Return the width (C<TW>) and height (C<TH>) of the terminal window (the
		539	terminal window is the full window by default, and the character area only
		540	when in border-respect mode).
		541
		542	Using these functions make your expression sensitive to window resizes.
		543
		544	These functions are mainly useful to scale images, or to clip images to
		545	the window size to conserve memory.
		546
		547	Example: take the screen background, clip it to the window size, blur it a
		548	bit, align it to the window position and use it as background.
		549
		550	clip move -TX, -TY, keep { blur 5, root }
		551
		552	=cut
		553
		554	sub TX() { $frame->[FR_AGAIN]{position} = 1; $x }
		555	sub TY() { $frame->[FR_AGAIN]{position} = 1; $y }
		556	sub TW() { $frame->[FR_AGAIN]{size} = 1; $w }
		557	sub TH() { $frame->[FR_AGAIN]{size} = 1; $h }
		558
		559	=item now
		560
		561	Returns the current time as (fractional) seconds since the epoch.
		562
		563	Using this expression does I<not> make your expression sensitive to time,
		564	but the next two functions do.
		565
		566	=item again $seconds
		567
		568	When this function is used the expression will be reevaluated again in
		569	C<$seconds> seconds.
		570
		571	Example: load some image and rotate it according to the time of day (as if it were
		572	the hour pointer of a clock). Update this image every minute.
		573
		574	again 60;
		575	rotate 50, 50, (now % 86400) * -72 / 8640, scale keep { load "myclock.png" }
		576
		577	=item counter $seconds
		578
		579	Like C<again>, but also returns an increasing counter value, starting at
		580	0, which might be useful for some simple animation effects.
		581
		582	=cut
		583
		584	sub now() { urxvt::NOW }
		585
		586	sub again($) {
		587	$frame->[FR_AGAIN]{time} = $_[0];
		588	}
		589
411	sub clone($) {	590	sub counter($) {
412	$_[0]->clone	591	$frame->[FR_AGAIN]{time} = $_[0];
		592	$frame->[FR_STATE]{counter} + 0
413	}	593	}
		594
		595	=back
		596
		597	=head2 SHAPE CHANGING OPERATORS
		598
		599	The following operators modify the shape, size or position of the image.
		600
		601	=over 4
414		602
415	=item clip $img	603	=item clip $img
416		604
417	=item clip $width, $height, $img	605	=item clip $width, $height, $img
418		606
…		…
429	assumed.	617	assumed.
430		618
431	Example: load an image, blur it, and clip it to the window size to save	619	Example: load an image, blur it, and clip it to the window size to save
432	memory.	620	memory.
433		621
434	clip blur 10, load "mybg.png"	622	clip keep { blur 10, load "mybg.png" }
435		623
436	=cut	624	=cut
437		625
438	sub clip($;$$;$$) {	626	sub clip($;$$;$$) {
439	my $img = pop;	627	my $img = pop;
…		…
442	$img->sub_rect ($_[0], $_[1], $w, $h)	630	$img->sub_rect ($_[0], $_[1], $w, $h)
443	}	631	}
444		632
445	=item scale $img	633	=item scale $img
446		634
447	=item scale $size_percent, $img	635	=item scale $size_factor, $img
448		636
449	=item scale $width_percent, $height_percent, $img	637	=item scale $width_factor, $height_factor, $img
450		638
451	Scales the image by the given percentages in horizontal	639	Scales the image by the given factors in horizontal
452	(C<$width_percent>) and vertical (C<$height_percent>) direction.	640	(C<$width>) and vertical (C<$height>) direction.
453		641
454	If only one percentage is give, it is used for both directions.	642	If only one factor is give, it is used for both directions.
455		643
456	If no percentages are given, scales the image to the window size without	644	If no factors are given, scales the image to the window size without
457	keeping aspect.	645	keeping aspect.
458		646
459	=item resize $width, $height, $img	647	=item resize $width, $height, $img
460		648
461	Resizes the image to exactly C<$width> times C<$height> pixels.	649	Resizes the image to exactly C<$width> times C<$height> pixels.
462		650
463	=cut	651	=item fit $img
464		652
465	#TODO: maximise, maximise_fill?	653	=item fit $width, $height, $img
		654
		655	Fits the image into the given C<$width> and C<$height> without changing
		656	aspect, or the terminal size. That means it will be shrunk or grown until
		657	the whole image fits into the given area, possibly leaving borders.
		658
		659	=item cover $img
		660
		661	=item cover $width, $height, $img
		662
		663	Similar to C<fit>, but shrinks or grows until all of the area is covered
		664	by the image, so instead of potentially leaving borders, it will cut off
		665	image data that doesn't fit.
		666
		667	=cut
466		668
467	sub scale($;$;$) {	669	sub scale($;$;$) {
468	my $img = pop;	670	my $img = pop;
469		671
470	@_ == 2 ? $img->scale ($_[0] * $img->w * 0.01, $_[1] * $img->h * 0.01)	672	@_ == 2 ? $img->scale ($_[0] * $img->w, $_[1] * $img->h)
471	: @_ ? $img->scale ($_[0] * $img->w * 0.01, $_[0] * $img->h * 0.01)	673	: @_ ? $img->scale ($_[0] * $img->w, $_[0] * $img->h)
472	: $img->scale (TW, TH)	674	: $img->scale (TW, TH)
473	}	675	}
474		676
475	sub resize($$$) {	677	sub resize($$$) {
476	my $img = pop;	678	my $img = pop;
477	$img->scale ($_[0], $_[1])	679	$img->scale ($_[0], $_[1])
478	}	680	}
479		681
		682	sub fit($;$$) {
		683	my $img = pop;
		684	my $w = ($_[0] \|\| TW) / $img->w;
		685	my $h = ($_[1] \|\| TH) / $img->h;
		686	scale +(min $w, $h), $img
		687	}
		688
		689	sub cover($;$$) {
		690	my $img = pop;
		691	my $w = ($_[0] \|\| TW) / $img->w;
		692	my $h = ($_[1] \|\| TH) / $img->h;
		693	scale +(max $w, $h), $img
		694	}
		695
480	=item move $dx, $dy, $img	696	=item move $dx, $dy, $img
481		697
482	Moves the image by C<$dx> pixels in the horizontal, and C<$dy> pixels in	698	Moves the image by C<$dx> pixels in the horizontal, and C<$dy> pixels in
483	the vertical.	699	the vertical.
484		700
485	Example: move the image right by 20 pixels and down by 30.	701	Example: move the image right by 20 pixels and down by 30.
486		702
487	move 20, 30, ...	703	move 20, 30, ...
		704
		705	=item align $xalign, $yalign, $img
		706
		707	Aligns the image according to a factor - C<0> means the image is moved to
		708	the left or top edge (for C<$xalign> or C<$yalign>), C<0.5> means it is
		709	exactly centered and C<1> means it touches the right or bottom edge.
		710
		711	Example: remove any visible border around an image, center it vertically but move
		712	it to the right hand side.
		713
		714	align 1, 0.5, pad $img
		715
		716	=item center $img
		717
		718	=item center $width, $height, $img
		719
		720	Centers the image, i.e. the center of the image is moved to the center of
		721	the terminal window (or the box specified by C<$width> and C<$height> if
		722	given).
		723
		724	Example: load an image and center it.
		725
		726	center keep { pad load "mybg.png" }
488		727
489	=item rootalign $img	728	=item rootalign $img
490		729
491	Moves the image so that it appears glued to the screen as opposed to the	730	Moves the image so that it appears glued to the screen as opposed to the
492	window. This gives the illusion of a larger area behind the window. It is	731	window. This gives the illusion of a larger area behind the window. It is
493	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the	732	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the
494	top left of the screen.	733	top left of the screen.
495		734
496	Example: load a background image, put it in mirror mode and root align it.	735	Example: load a background image, put it in mirror mode and root align it.
497		736
498	rootalign mirror load "mybg.png"	737	rootalign keep { mirror load "mybg.png" }
499		738
500	Example: take the screen background and align it, giving the illusion of	739	Example: take the screen background and align it, giving the illusion of
501	transparency as long as the window isn't in front of other windows.	740	transparency as long as the window isn't in front of other windows.
502		741
503	rootalign root	742	rootalign root
504		743
505	=cut	744	=cut
506		745
507	sub move($$;$) {	746	sub move($$;$) {
508	my $img = pop->clone;	747	my $img = pop->clone;
509	$img->move ($_[0], $_[1]);	748	$img->move ($_[0], $_[1]);
510	$img	749	$img
511	}	750	}
512		751
		752	sub align($;$$) {
		753	my $img = pop;
		754
		755	move $_[0] * (TW - $img->w),
		756	$_[1] * (TH - $img->h),
		757	$img
		758	}
		759
		760	sub center($;$$) {
		761	my $img = pop;
		762	my $w = $_[0] \|\| TW;
		763	my $h = $_[1] \|\| TH;
		764
		765	move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img
		766	}
		767
513	sub rootalign($) {	768	sub rootalign($) {
514	move -TX, -TY, $_[0]	769	move -TX, -TY, $_[0]
515	}	770	}
516		771
		772	=item rotate $center_x, $center_y, $degrees, $img
		773
		774	Rotates the image clockwise by C<$degrees> degrees, around the point at
		775	C<$center_x> and C<$center_y> (specified as factor of image width/height).
		776
		777	Example: rotate the image by 90 degrees around it's center.
		778
		779	rotate 0.5, 0.5, 90, keep { load "$HOME/mybg.png" }
		780
		781	=cut
		782
		783	sub rotate($$$$) {
		784	my $img = pop;
		785	$img->rotate (
		786	$_[0] * ($img->w + $img->x),
		787	$_[1] * ($img->h + $img->y),
		788	$_[2] * (3.14159265 / 180),
		789	)
		790	}
		791
		792	=back
		793
		794	=head2 COLOUR MODIFICATIONS
		795
		796	The following operators change the pixels of the image.
		797
		798	=over 4
		799
		800	=item tint $color, $img
		801
		802	Tints the image in the given colour.
		803
		804	Example: tint the image red.
		805
		806	tint "red", load "rgb.png"
		807
		808	Example: the same, but specify the colour by component.
		809
		810	tint [1, 0, 0], load "rgb.png"
		811
		812	=cut
		813
		814	sub tint($$) {
		815	$_[1]->tint ($_[0])
		816	}
		817
517	=item contrast $factor, $img	818	=item contrast $factor, $img
518		819
519	=item contrast $r, $g, $b, $img	820	=item contrast $r, $g, $b, $img
520		821
521	=item contrast $r, $g, $b, $a, $img	822	=item contrast $r, $g, $b, $a, $img
522		823
523	Adjusts the I<contrast> of an image.	824	Adjusts the I<contrast> of an image.
524		825
525	#TODO#	826	The first form applies a single C<$factor> to red, green and blue, the
		827	second form applies separate factors to each colour channel, and the last
		828	form includes the alpha channel.
526		829
		830	Values from 0 to 1 lower the contrast, values higher than 1 increase the
		831	contrast.
		832
		833	Due to limitations in the underlying XRender extension, lowering contrast
		834	also reduces brightness, while increasing contrast currently also
		835	increases brightness.
		836
527	=item brightness $factor, $img	837	=item brightness $bias, $img
528		838
529	=item brightness $r, $g, $b, $img	839	=item brightness $r, $g, $b, $img
530		840
531	=item brightness $r, $g, $b, $a, $img	841	=item brightness $r, $g, $b, $a, $img
532		842
533	Adjusts the brightness of an image.	843	Adjusts the brightness of an image.
		844
		845	The first form applies a single C<$bias> to red, green and blue, the
		846	second form applies separate biases to each colour channel, and the last
		847	form includes the alpha channel.
		848
		849	Values less than 0 reduce brightness, while values larger than 0 increase
		850	it. Useful range is from -1 to 1 - the former results in a black, the
		851	latter in a white picture.
		852
		853	Due to idiosyncrasies in the underlying XRender extension, biases less
		854	than zero can be I<very> slow.
		855
		856	You can also try the experimental(!) C<muladd> operator.
534		857
535	=cut	858	=cut
536		859
537	sub contrast($$;$$;$) {	860	sub contrast($$;$$;$) {
538	my $img = pop;	861	my $img = pop;
539	my ($r, $g, $b, $a) = @_;	862	my ($r, $g, $b, $a) = @_;
540		863
541	($g, $b) = ($r, $r) if @_ < 4;	864	($g, $b) = ($r, $r) if @_ < 3;
542	$a = 1 if @_ < 5;	865	$a = 1 if @_ < 4;
543		866
544	$img = $img->clone;	867	$img = $img->clone;
545	$img->contrast ($r, $g, $b, $a);	868	$img->contrast ($r, $g, $b, $a);
546	$img	869	$img
547	}	870	}
548		871
549	sub brightness($$;$$;$) {	872	sub brightness($$;$$;$) {
550	my $img = pop;	873	my $img = pop;
551	my ($r, $g, $b, $a) = @_;	874	my ($r, $g, $b, $a) = @_;
552		875
553	($g, $b) = ($r, $r) if @_ < 4;	876	($g, $b) = ($r, $r) if @_ < 3;
554	$a = 1 if @_ < 5;	877	$a = 1 if @_ < 4;
555		878
556	$img = $img->clone;	879	$img = $img->clone;
557	$img->brightness ($r, $g, $b, $a);	880	$img->brightness ($r, $g, $b, $a);
558	$img	881	$img
559	}	882	}
560		883
		884	=item muladd $mul, $add, $img # EXPERIMENTAL
		885
		886	First multipliesthe pixels by C<$mul>, then adds C<$add>. This cna be used
		887	to implement brightness and contrast at the same time, with a wider value
		888	range than contrast and brightness operators.
		889
		890	Due to numerous bugs in XRender implementations, it can also introduce a
		891	number of visual artifacts.
		892
		893	Example: increase contrast by a factor of C<$c> without changing image
		894	brightness too much.
		895
		896	muladd $c, (1 - $c) * 0.5, $img
		897
		898	=cut
		899
		900	sub muladd($$$) {
		901	$_[2]->muladd ($_[0], $_[1])
		902	}
		903
561	=item blur $radius, $img	904	=item blur $radius, $img
562		905
563	=item blur $radius_horz, $radius_vert, $img	906	=item blur $radius_horz, $radius_vert, $img
564		907
565	Gaussian-blurs the image with (roughly) C<$radius> pixel radius. The radii	908	Gaussian-blurs the image with (roughly) C<$radius> pixel radius. The radii
566	can also be specified separately.	909	can also be specified separately.
		910
		911	Blurring is often I<very> slow, at least compared or other
		912	operators. Larger blur radii are slower than smaller ones, too, so if you
		913	don't want to freeze your screen for long times, start experimenting with
		914	low values for radius (<5).
567		915
568	=cut	916	=cut
569		917
570	sub blur($$;$) {	918	sub blur($$;$) {
571	my $img = pop;	919	my $img = pop;
572	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])	920	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
573	}	921	}
574		922
575	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees
576
577	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
578	pointer at C<$center_x> and C<$center_y> (specified as percentage of image
579	width/height), generating a new image with width C<$new_width> and height
580	C<$new_height>.
581
582	#TODO# new width, height, maybe more operators?
583
584	Example: rotate the image by 90 degrees
585
586	=cut
587
588	sub rotate($$$$$$) {
589	my $img = pop;
590	$img->rotate (
591	$_[0],
592	$_[1],
593	$_[2] * $img->w * .01,
594	$_[3] * $img->h * .01,
595	$_[4] * (3.14159265 / 180),
596	)
597	}
598
599	=back	923	=back
600		924
		925	=head2 OTHER STUFF
		926
		927	Anything that didn't fit any of the other categories, even after applying
		928	force and closing our eyes.
		929
		930	=over 4
		931
		932	=item keep { ... }
		933
		934	This operator takes a code block as argument, that is, one or more
		935	statements enclosed by braces.
		936
		937	The trick is that this code block is only evaluated when the outcome
		938	changes - on other calls the C<keep> simply returns the image it computed
		939	previously (yes, it should only be used with images). Or in other words,
		940	C<keep> I<caches> the result of the code block so it doesn't need to be
		941	computed again.
		942
		943	This can be extremely useful to avoid redoing slow operations - for
		944	example, if your background expression takes the root background, blurs it
		945	and then root-aligns it it would have to blur the root background on every
		946	window move or resize.
		947
		948	Another example is C<load>, which can be quite slow.
		949
		950	In fact, urxvt itself encloses the whole expression in some kind of
		951	C<keep> block so it only is reevaluated as required.
		952
		953	Putting the blur into a C<keep> block will make sure the blur is only done
		954	once, while the C<rootalign> is still done each time the window moves.
		955
		956	rootalign keep { blur 10, root }
		957
		958	This leaves the question of how to force reevaluation of the block,
		959	in case the root background changes: If expression inside the block
		960	is sensitive to some event (root background changes, window geometry
		961	changes), then it will be reevaluated automatically as needed.
		962
		963	=cut
		964
		965	sub keep(&) {
		966	my $id = $_[0]+0;
		967
		968	local $frame = $self->{frame_cache}{$id} \|\|= [$frame];
		969
		970	unless ($frame->[FR_CACHE]) {
		971	$frame->[FR_CACHE] = [ $_[0]() ];
		972
		973	my $self = $self;
		974	my $frame = $frame;
		975	Scalar::Util::weaken $frame;
		976	$self->compile_frame ($frame, sub {
		977	# clear this frame cache, also for all parents
		978	for (my $frame = $frame; $frame; $frame = $frame->[0]) {
		979	undef $frame->[FR_CACHE];
		980	}
		981
		982	$self->recalculate;
		983	});
		984	};
		985
		986	# in scalar context we always return the first original result, which
		987	# is not quite how perl works.
		988	wantarray
		989	? @{ $frame->[FR_CACHE] }
		990	: $frame->[FR_CACHE][0]
		991	}
		992
		993	# sub keep_clear() {
		994	# delete $self->{frame_cache};
		995	# }
		996
		997	=back
		998
601	=cut	999	=cut
602		1000
603	}	1001	}
604		1002
605	sub parse_expr {	1003	sub parse_expr {
606	my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}";	1004	my $expr = eval
		1005	"sub {\n"
		1006	. "package urxvt::bgdsl;\n"
		1007	. "#line 0 'background expression'\n"
		1008	. "$_[0]\n"
		1009	. "}";
607	die if $@;	1010	die if $@;
608	$expr	1011	$expr
609	}	1012	}
610		1013
611	# compiles a parsed expression	1014	# compiles a parsed expression
612	sub set_expr {	1015	sub set_expr {
613	my ($self, $expr) = @_;	1016	my ($self, $expr) = @_;
614		1017
		1018	$self->{root} = []; # the outermost frame
615	$self->{expr} = $expr;	1019	$self->{expr} = $expr;
616	$self->recalculate;	1020	$self->recalculate;
		1021	}
		1022
		1023	# takes a hash of sensitivity indicators and installs watchers
		1024	sub compile_frame {
		1025	my ($self, $frame, $cb) = @_;
		1026
		1027	my $state = $frame->[urxvt::bgdsl::FR_STATE] \|\|= {};
		1028	my $again = $frame->[urxvt::bgdsl::FR_AGAIN];
		1029
		1030	# don't keep stuff alive
		1031	Scalar::Util::weaken $state;
		1032
		1033	if ($again->{nested}) {
		1034	$state->{nested} = 1;
		1035	} else {
		1036	delete $state->{nested};
		1037	}
		1038
		1039	if (my $interval = $again->{time}) {
		1040	$state->{time} = [$interval, urxvt::timer->new->after ($interval)->interval ($interval)]
		1041	if $state->{time}[0] != $interval;
		1042
		1043	# callback might have changed, although we could just rule that out
		1044	$state->{time}[1]->cb (sub {
		1045	++$state->{counter};
		1046	$cb->();
		1047	});
		1048	} else {
		1049	delete $state->{time};
		1050	}
		1051
		1052	if ($again->{position}) {
		1053	$state->{position} = $self->on (position_change => $cb);
		1054	} else {
		1055	delete $state->{position};
		1056	}
		1057
		1058	if ($again->{size}) {
		1059	$state->{size} = $self->on (size_change => $cb);
		1060	} else {
		1061	delete $state->{size};
		1062	}
		1063
		1064	if ($again->{rootpmap}) {
		1065	$state->{rootpmap} = $self->on (rootpmap_change => $cb);
		1066	} else {
		1067	delete $state->{rootpmap};
		1068	}
617	}	1069	}
618		1070
619	# evaluate the current bg expression	1071	# evaluate the current bg expression
620	sub recalculate {	1072	sub recalculate {
621	my ($arg_self) = @_;	1073	my ($arg_self) = @_;
…		…
631		1083
632	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;	1084	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;
633		1085
634	# set environment to evaluate user expression	1086	# set environment to evaluate user expression
635		1087
636	local $self = $arg_self;	1088	local $self = $arg_self;
637
638	local $HOME = $ENV{HOME};	1089	local $HOME = $ENV{HOME};
639	local $old = $self->{state};	1090	local $frame = $self->{root};
640	local $new = my $state = $self->{state} = {};
641		1091
642	($x, $y, $w, $h) =
643	$self->background_geometry ($self->{border});	1092	($x, $y, $w, $h) = $self->background_geometry ($self->{border});
644		1093
645	# evaluate user expression	1094	# evaluate user expression
646		1095
647	my $img = eval { $self->{expr}->() };	1096	my @img = eval { $self->{expr}->() };
648	warn $@ if $@;#d#	1097	die $@ if $@;
		1098	die "background-expr did not return anything.\n" unless @img;
		1099	die "background-expr: expected image(s), got something else.\n"
649	die if !UNIVERSAL::isa $img, "urxvt::img";	1100	if grep { !UNIVERSAL::isa $_, "urxvt::img" } @img;
650		1101
651	$state->{size_sensitive} = 1	1102	my $img = urxvt::bgdsl::merge @img;
		1103
		1104	$frame->[FR_AGAIN]{size} = 1
652	if $img->repeat_mode != urxvt::RepeatNormal;	1105	if $img->repeat_mode != urxvt::RepeatNormal;
653		1106
654	# if the expression is sensitive to external events, prepare reevaluation then	1107	# if the expression is sensitive to external events, prepare reevaluation then
655		1108	$self->compile_frame ($frame, sub { $arg_self->recalculate });
656	my $repeat;
657
658	if (my $again = $state->{again}) {
659	$repeat = 1;
660	my $self = $self;
661	$state->{timer} = $again == $old->{again}
662	? $old->{timer}
663	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
664	++$self->{counter};
665	$self->recalculate
666	});
667	}
668
669	if (delete $state->{position_sensitive}) {
670	$repeat = 1;
671	$self->enable (position_change => sub { $_[0]->recalculate });
672	} else {
673	$self->disable ("position_change");
674	}
675
676	if (delete $state->{size_sensitive}) {
677	$repeat = 1;
678	$self->enable (size_change => sub { $_[0]->recalculate });
679	} else {
680	$self->disable ("size_change");
681	}
682
683	if (delete $state->{rootpmap_sensitive}) {
684	$repeat = 1;
685	$self->enable (rootpmap_change => sub { $_[0]->recalculate });
686	} else {
687	$self->disable ("rootpmap_change");
688	}
689		1109
690	# clear stuff we no longer need	1110	# clear stuff we no longer need
691		1111
692	%$old = ();	1112	# unless (%{ $frame->[FR_STATE] }) {
693
694	unless ($repeat) {
695	delete $self->{state};	1113	# delete $self->{state};
696	delete $self->{expr};	1114	# delete $self->{expr};
697	}	1115	# }
698		1116
699	# set background pixmap	1117	# set background pixmap
700		1118
701	$self->set_background ($img, $self->{border});	1119	$self->set_background ($img, $self->{border});
702	$self->scr_recolour (0);	1120	$self->scr_recolour (0);
…		…
704	}	1122	}
705		1123
706	sub on_start {	1124	sub on_start {
707	my ($self) = @_;	1125	my ($self) = @_;
708		1126
709	my $expr = $self->x_resource ("background.expr")	1127	my $expr = $self->x_resource ("%.expr")
710	or return;	1128	or return;
711		1129
		1130	$self->has_render
		1131	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";
		1132
712	$self->set_expr (parse_expr $expr);	1133	$self->set_expr (parse_expr $expr);
713	$self->{border} = $self->x_resource_boolean ("background.border");	1134	$self->{border} = $self->x_resource_boolean ("%.border");
		1135
		1136	$MIN_INTERVAL = $self->x_resource ("%.interval");
714		1137
715	()	1138	()
716	}	1139	}
717		1140

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.38 by root, Fri Jun 8 21:48:07 2012 UTC vs. Revision 1.75 by root, Fri Aug 10 20:07:11 2012 UTC

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Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.38 by root, Fri Jun 8 21:48:07 2012 UTC vs.
Revision 1.75 by root, Fri Aug 10 20:07:11 2012 UTC