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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.32 by sf-exg, Thu Jun 7 13:56:27 2012 UTC vs.
Revision 1.45 by root, Sun Jun 10 11:53:32 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:%.enable:boolean:some boolean	4	#:META:X_RESOURCE:%.border.:boolean:respect the terminal border
5	#:META:X_RESOURCE:%.extra.:value:extra config
6		5
7	our $EXPR;	6	#TODO: once, rootalign
8	#$EXPR = 'move W * 0.1, -H * 0.1, resize W * 0.5, H * 0.5, repeat_none load "opensource.png"';
9	$EXPR = 'move -TX, -TY, load "argb.png"';
10	#$EXPR = '
11	# rotate W, H, 50, 50, counter 1/59.95, repeat_mirror,
12	# clip X, Y, W, H, repeat_mirror,
13	# load "/root/pix/das_fette_schwein.jpg"
14	#';
15	#$EXPR = 'solid "red"';
16	#$EXPR = 'blur root, 10, 10'
17	#$EXPR = 'blur move (root, -x, -y), 5, 5'
18	#resize load "/root/pix/das_fette_schwein.jpg", w, h
19		7
20	use Safe;	8	=head1 NAME
21		9
		10	background - manage terminal background
		11
		12	=head1 SYNOPSIS
		13
		14	urxvt --background-expr 'background expression'
		15	--background-border
		16
		17	=head1 DESCRIPTION
		18
		19	This extension manages the terminal background by creating a picture that
		20	is behind the text, replacing the normal background colour.
		21
		22	It does so by evaluating a Perl expression that I<calculates> the image on
		23	the fly, for example, by grabbing the root background or loading a file.
		24
		25	While the full power of Perl is available, the operators have been design
		26	to be as simple as possible.
		27
		28	For example, to load an image and scale it to the window size, you would
		29	use:
		30
		31	urxvt --background-expr 'scale load "/path/to/mybg.png"'
		32
		33	Or specified as a X resource:
		34
		35	URxvt.background-expr: scale load "/path/to/mybg.png"
		36
		37	=head1 THEORY OF OPERATION
		38
		39	At startup, just before the window is mapped for the first time, the
		40	expression is evaluated and must yield an image. The image is then
		41	extended as necessary to cover the whole terminal window, and is set as a
		42	background pixmap.
		43
		44	If the image contains an alpha channel, then it will be used as-is in
		45	visuals that support alpha channels (for example, for a compositing
		46	manager). In other visuals, the terminal background colour will be used to
		47	replace any transparency.
		48
		49	When the expression relies, directly or indirectly, on the window size,
		50	position, the root pixmap, or a timer, then it will be remembered. If not,
		51	then it will be removed.
		52
		53	If any of the parameters that the expression relies on changes (when the
		54	window is moved or resized, its position or size changes; when the root
		55	pixmap is replaced by another one the root background changes; or when the
		56	timer elapses), then the expression will be evaluated again.
		57
		58	For example, an expression such as C<scale load "$HOME/mybg.png"> scales the
		59	image to the window size, so it relies on the window size and will
		60	be reevaluated each time it is changed, but not when it moves for
		61	example. That ensures that the picture always fills the terminal, even
		62	after it's size changes.
		63
		64	=head2 EXPRESSIONS
		65
		66	Expressions are normal Perl expressions, in fact, they are Perl blocks -
		67	which means you could use multiple lines and statements:
		68
		69	again 3600;
		70	if (localtime now)[6]) {
		71	return scale load "$HOME/weekday.png";
		72	} else {
		73	return scale load "$HOME/sunday.png";
		74	}
		75
		76	This expression gets evaluated once per hour. It will set F<sunday.png> as
		77	background on Sundays, and F<weekday.png> on all other days.
		78
		79	Fortunately, we expect that most expressions will be much simpler, with
		80	little Perl knowledge needed.
		81
		82	Basically, you always start with a function that "generates" an image
		83	object, such as C<load>, which loads an image from disk, or C<root>, which
		84	returns the root window background image:
		85
		86	load "$HOME/mypic.png"
		87
		88	The path is usually specified as a quoted string (the exact rules can be
		89	found in the L<perlop> manpage). The F<$HOME> at the beginning of the
		90	string is expanded to the home directory.
		91
		92	Then you prepend one or more modifiers or filtering expressions, such as
		93	C<scale>:
		94
		95	scale load "$HOME/mypic.png"
		96
		97	Just like a mathematical expression with functions, you should read these
		98	expressions from right to left, as the C<load> is evaluated first, and
		99	its result becomes the argument to the C<scale> function.
		100
		101	Many operators also allow some parameters preceding the input image
		102	that modify its behaviour. For example, C<scale> without any additional
		103	arguments scales the image to size of the terminal window. If you specify
		104	an additional argument, it uses it as a scale factor (multiply by 100 to
		105	get a percentage):
		106
		107	scale 2, load "$HOME/mypic.png"
		108
		109	This enlarges the image by a factor of 2 (200%). As you can see, C<scale>
		110	has now two arguments, the C<200> and the C<load> expression, while
		111	C<load> only has one argument. Arguments are separated from each other by
		112	commas.
		113
		114	Scale also accepts two arguments, which are then separate factors for both
		115	horizontal and vertical dimensions. For example, this halves the image
		116	width and doubles the image height:
		117
		118	scale 0.5, 2, load "$HOME/mypic.png"
		119
		120	Other effects than scalign are also readily available, for exmaple, you can
		121	tile the image to fill the whole window, instead of resizing it:
		122
		123	tile load "$HOME/mypic.png"
		124
		125	In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator
		126	is kind of superfluous.
		127
		128	Another common effect is to mirror the image, so that the same edges touch:
		129
		130	mirror load "$HOME/mypic.png"
		131
		132	This is also a typical background expression:
		133
		134	rootalign root
		135
		136	It first takes a snapshot of the screen background image, and then
		137	moves it to the upper left corner of the screen - the result is
		138	pseudo-transparency, as the image seems to be static while the window is
		139	moved around.
		140
		141	=head2 CYCLES AND CACHING
		142
		143	As has been mentioned before, the expression might be evaluated multiple
		144	times. Each time the expression is reevaluated, a new cycle is said to
		145	have begun. Many operators cache their results till the next cycle.
		146
		147	For example, the C<load> operator keeps a copy of the image. If it is
		148	asked to load the same image on the next cycle it will not load it again,
		149	but return the cached copy.
		150
		151	This only works for one cycle though, so as long as you load the same
		152	image every time, it will always be cached, but when you load a different
		153	image, it will forget about the first one.
		154
		155	This allows you to either speed things up by keeping multiple images in
		156	memory, or comserve memory by loading images more often.
		157
		158	For example, you can keep two images in memory and use a random one like
		159	this:
		160
		161	my $img1 = load "img1.png";
		162	my $img2 = load "img2.png";
		163	(0.5 > rand) ? $img1 : $img2
		164
		165	Since both images are "loaded" every time the expression is evaluated,
		166	they are always kept in memory. Contrast this version:
		167
		168	my $path1 = "img1.png";
		169	my $path2 = "img2.png";
		170	load ((0.5 > rand) ? $path1 : $path2)
		171
		172	Here, a path is selected randomly, and load is only called for one image,
		173	so keeps only one image in memory. If, on the next evaluation, luck
		174	decides to use the other path, then it will have to load that image again.
		175
		176	=head1 REFERENCE
		177
		178	=head2 COMMAND LINE SWITCHES
		179
		180	=over 4
		181
		182	=item --background-expr perl-expression
		183
		184	Specifies the Perl expression to evaluate.
		185
		186	=item --background-border
		187
		188	By default, the expression creates an image that fills the full window,
		189	overwriting borders and any other areas, such as the scrollbar.
		190
		191	Specifying this flag changes the behaviour, so that the image only
		192	replaces the background of the character area.
		193
		194	=back
		195
		196	=cut
		197
		198	our $HOME;
22	our ($bgdsl_self, $old, $new);	199	our ($self, $old, $new);
23	our ($x, $y, $w, $h);	200	our ($x, $y, $w, $h);
24		201
25	# enforce at least this interval between updates	202	# enforce at least this interval between updates
26	our $MIN_INTERVAL = 1/100;	203	our $MIN_INTERVAL = 1/100;
27		204
28	{	205	{
29	package urxvt::bgdsl; # background language	206	package urxvt::bgdsl; # background language
		207
		208	use List::Util qw(min max sum shuffle);
30		209
31	=head2 PROVIDERS/GENERATORS	210	=head2 PROVIDERS/GENERATORS
32		211
33	These functions provide an image, by loading it from disk, grabbing it	212	These functions provide an image, by loading it from disk, grabbing it
34	from the root screen or by simply generating it. They are used as starting	213	from the root screen or by simply generating it. They are used as starting
46	=cut	225	=cut
47		226
48	sub load($) {	227	sub load($) {
49	my ($path) = @_;	228	my ($path) = @_;
50		229
51	$new->{load}{$path} = $old->{load}{$path} \|\| $bgdsl_self->new_img_from_file ($path);	230	$new->{load}{$path} = $old->{load}{$path} \|\| $self->new_img_from_file ($path);
52	}	231	}
53		232
54	=item root	233	=item root
55		234
56	Returns the root window pixmap, that is, hopefully, the background image	235	Returns the root window pixmap, that is, hopefully, the background image
…		…
71	=item solid $width, $height, $colour	250	=item solid $width, $height, $colour
72		251
73	Creates a new image and completely fills it with the given colour. The	252	Creates a new image and completely fills it with the given colour. The
74	image is set to tiling mode.	253	image is set to tiling mode.
75		254
76	If <$width> and C<$height> are omitted, it creates a 1x1 image, which is	255	If C<$width> and C<$height> are omitted, it creates a 1x1 image, which is
77	useful for solid backgrounds or for use in filtering effects.	256	useful for solid backgrounds or for use in filtering effects.
78		257
79	=cut	258	=cut
80		259
81	sub solid($$;$) {	260	sub solid($;$$) {
82	my $colour = pop;	261	my $colour = pop;
83		262
84	my $img = $bgdsl_self->new_img (urxvt::PictStandardARGB32, $_[0] \|\| 1, $_[1] \|\| 1);	263	my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] \|\| 1, $_[1] \|\| 1);
85	$img->fill ($colour);	264	$img->fill ($colour);
86	$img	265	$img
87	}	266	}
88		267
		268	=item clone $img
		269
		270	Returns an exact copy of the image. This is useful if you want to have
		271	multiple copies of the same image to apply different effects to.
		272
		273	=cut
		274
		275	sub clone($) {
		276	$_[0]->clone
		277	}
		278
89	=back	279	=back
90		280
		281	=head2 TILING MODES
		282
		283	The following operators modify the tiling mode of an image, that is, the
		284	way that pixels outside the image area are painted when the image is used.
		285
		286	=over 4
		287
		288	=item tile $img
		289
		290	Tiles the whole plane with the image and returns this new image - or in
		291	other words, it returns a copy of the image in plane tiling mode.
		292
		293	Example: load an image and tile it over the background, without
		294	resizing. The C<tile> call is superfluous because C<load> already defaults
		295	to tiling mode.
		296
		297	tile load "mybg.png"
		298
		299	=item mirror $img
		300
		301	Similar to tile, but reflects the image each time it uses a new copy, so
		302	that top edges always touch top edges, right edges always touch right
		303	edges and so on (with normal tiling, left edges always touch right edges
		304	and top always touch bottom edges).
		305
		306	Example: load an image and mirror it over the background, avoiding sharp
		307	edges at the image borders at the expense of mirroring the image itself
		308
		309	mirror load "mybg.png"
		310
		311	=item pad $img
		312
		313	Takes an image and modifies it so that all pixels outside the image area
		314	become transparent. This mode is most useful when you want to place an
		315	image over another image or the background colour while leaving all
		316	background pixels outside the image unchanged.
		317
		318	Example: load an image and display it in the upper left corner. The rest
		319	of the space is left "empty" (transparent or wahtever your compisotr does
		320	in alpha mode, else background colour).
		321
		322	pad load "mybg.png"
		323
		324	=item extend $img
		325
		326	Extends the image over the whole plane, using the closest pixel in the
		327	area outside the image. This mode is mostly useful when you more complex
		328	filtering operations and want the pixels outside the image to have the
		329	same values as the pixels near the edge.
		330
		331	Example: just for curiosity, how does this pixel extension stuff work?
		332
		333	extend move 50, 50, load "mybg.png"
		334
		335	=cut
		336
		337	sub pad($) {
		338	my $img = $_[0]->clone;
		339	$img->repeat_mode (urxvt::RepeatNone);
		340	$img
		341	}
		342
		343	sub tile($) {
		344	my $img = $_[0]->clone;
		345	$img->repeat_mode (urxvt::RepeatNormal);
		346	$img
		347	}
		348
		349	sub mirror($) {
		350	my $img = $_[0]->clone;
		351	$img->repeat_mode (urxvt::RepeatReflect);
		352	$img
		353	}
		354
		355	sub extend($) {
		356	my $img = $_[0]->clone;
		357	$img->repeat_mode (urxvt::RepeatPad);
		358	$img
		359	}
		360
		361	=back
		362
91	=head2 VARIABLES	363	=head2 VARIABLE VALUES
92		364
93	The following functions provide variable data such as the terminal	365	The following functions provide variable data such as the terminal window
		366	dimensions. They are not (Perl-) variables, they just return stuff that
94	window dimensions. Most of them make your expression sensitive to some	367	varies. Most of them make your expression sensitive to some events, for
95	events, for example using C<TW> (terminal width) means your expression is	368	example using C<TW> (terminal width) means your expression is evaluated
96	evaluated again when the terminal is resized.	369	again when the terminal is resized.
97		370
98	=over 4	371	=over 4
99		372
100	=item TX	373	=item TX
101		374
…		…
135	sub TX() { $new->{position_sensitive} = 1; $x }	408	sub TX() { $new->{position_sensitive} = 1; $x }
136	sub TY() { $new->{position_sensitive} = 1; $y }	409	sub TY() { $new->{position_sensitive} = 1; $y }
137	sub TW() { $new->{size_sensitive} = 1; $w }	410	sub TW() { $new->{size_sensitive} = 1; $w }
138	sub TH() { $new->{size_sensitive} = 1; $h }	411	sub TH() { $new->{size_sensitive} = 1; $h }
139		412
		413	=item now
		414
		415	Returns the current time as (fractional) seconds since the epoch.
		416
		417	Using this expression does I<not> make your expression sensitive to time,
		418	but the next two functions do.
		419
		420	=item again $seconds
		421
		422	When this function is used the expression will be reevaluated again in
		423	C<$seconds> seconds.
		424
		425	Example: load some image and rotate it according to the time of day (as if it were
		426	the hour pointer of a clock). Update this image every minute.
		427
		428	again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"
		429
		430	=item counter $seconds
		431
		432	Like C<again>, but also returns an increasing counter value, starting at
		433	0, which might be useful for some simple animation effects.
		434
		435	=cut
		436
140	sub now() { urxvt::NOW }	437	sub now() { urxvt::NOW }
141		438
142	sub again($) {	439	sub again($) {
143	$new->{again} = $_[0];	440	$new->{again} = $_[0];
144	}	441	}
145		442
146	sub counter($) {	443	sub counter($) {
147	$new->{again} = $_[0];	444	$new->{again} = $_[0];
148	$bgdsl_self->{counter} + 0	445	$self->{counter} + 0
149	}	446	}
150		447
151	=back	448	=back
152		449
153	=head2 TILING MODES	450	=head2 SHAPE CHANGING OPERATORS
154		451
155	The following operators modify the tiling mode of an image, that is, the	452	The following operators modify the shape, size or position of the image.
156	way that pixels outside the image area are painted when the image is used.
157		453
158	=over 4	454	=over 4
159
160	=item tile $img
161
162	Tiles the whole plane with the image and returns this new image - or in
163	other words, it returns a copy of the image in plane tiling mode.
164
165	=item mirror $img
166
167	Similar to tile, but reflects the image each time it uses a new copy, so
168	that top edges always touch top edges, right edges always touch right
169	edges and so on (with normal tiling, left edges always touch right edges
170	and top always touch bottom edges).
171
172	=item pad $img
173
174	Takes an image and modifies it so that all pixels outside the image area
175	become transparent. This mode is most useful when you want to place an
176	image over another image or the background colour while leaving all
177	background pixels outside the image unchanged.
178
179	=item extend $img
180
181	Extends the image over the whole plane, using the closest pixel in the
182	area outside the image. This mode is mostly useful when you more complex
183	filtering operations and want the pixels outside the image to have the
184	same values as the pixels near the edge.
185
186	=cut
187
188	sub pad($) {
189	my $img = $_[0]->clone;
190	$img->repeat_mode (urxvt::RepeatNone);
191	$img
192	}
193
194	sub tile($) {
195	my $img = $_[0]->clone;
196	$img->repeat_mode (urxvt::RepeatNormal);
197	$img
198	}
199
200	sub mirror($) {
201	my $img = $_[0]->clone;
202	$img->repeat_mode (urxvt::RepeatReflect);
203	$img
204	}
205
206	sub extend($) {
207	my $img = $_[0]->clone;
208	$img->repeat_mode (urxvt::RepeatPad);
209	$img
210	}
211
212	=back
213
214	=head2 PIXEL OPERATORS
215
216	The following operators modify the image pixels in various ways.
217
218	=over 4
219
220	=item clone $img
221
222	Returns an exact copy of the image.
223
224	=cut
225
226	sub clone($) {
227	$_[0]->clone
228	}
229		455
230	=item clip $img	456	=item clip $img
231		457
232	=item clip $width, $height, $img	458	=item clip $width, $height, $img
233		459
…		…
257	$img->sub_rect ($_[0], $_[1], $w, $h)	483	$img->sub_rect ($_[0], $_[1], $w, $h)
258	}	484	}
259		485
260	=item scale $img	486	=item scale $img
261		487
262	=item scale $size_percent, $img	488	=item scale $size_factor, $img
263		489
264	=item scale $width_percent, $height_percent, $img	490	=item scale $width_factor, $height_factor, $img
265		491
266	Scales the image by the given percentages in horizontal	492	Scales the image by the given factors in horizontal
267	(C<$width_percent>) and vertical (C<$height_percent>) direction.	493	(C<$width>) and vertical (C<$height>) direction.
268		494
269	If only one percentage is give, it is used for both directions.	495	If only one factor is give, it is used for both directions.
270		496
271	If no percentages are given, scales the image to the window size without	497	If no factors are given, scales the image to the window size without
272	keeping aspect.	498	keeping aspect.
273		499
274	=item resize $width, $height, $img	500	=item resize $width, $height, $img
275		501
276	Resizes the image to exactly C<$width> times C<$height> pixels.	502	Resizes the image to exactly C<$width> times C<$height> pixels.
277		503
278	=cut	504	=item fit $img
279		505
280	#TODO: maximise, maximise_fill?	506	=item fit $width, $height, $img
281		507
		508	Fits the image into the given C<$width> and C<$height> without changing
		509	aspect, or the terminal size. That means it will be shrunk or grown until
		510	the whole image fits into the given area, possibly leaving borders.
		511
		512	=item cover $img
		513
		514	=item cover $width, $height, $img
		515
		516	Similar to C<fit>, but shrinks or grows until all of the area is covered
		517	by the image, so instead of potentially leaving borders, it will cut off
		518	image data that doesn't fit.
		519
		520	=cut
		521
282	sub scale($$$) {	522	sub scale($;$;$) {
283	my $img = pop;	523	my $img = pop;
284		524
285	@_ == 2 ? $img->scale ($_[0] * $img->w * 0.01, $_[1] * $img->h * 0.01)	525	@_ == 2 ? $img->scale ($_[0] * $img->w, $_[1] * $img->h)
286	: @_ ? $img->scale ($_[0] * $img->w * 0.01, $_[0] * $img->h * 0.01)	526	: @_ ? $img->scale ($_[0] * $img->w, $_[0] * $img->h)
287	: $img->scale (TW, TH)	527	: $img->scale (TW, TH)
288	}	528	}
289		529
290	sub resize($$$) {	530	sub resize($$$) {
291	my $img = pop;	531	my $img = pop;
292	$img->scale ($_[0], $_[1])	532	$img->scale ($_[0], $_[1])
293	}	533	}
		534
		535	sub fit($;$$) {
		536	my $img = pop;
		537	my $w = ($_[0] \|\| TW) / $img->w;
		538	my $h = ($_[1] \|\| TH) / $img->h;
		539	scale +(min $w, $h), $img
		540	}
		541
		542	sub cover($;$$) {
		543	my $img = pop;
		544	my $w = ($_[0] \|\| TW) / $img->w;
		545	my $h = ($_[1] \|\| TH) / $img->h;
		546	scale +(max $w, $h), $img
		547	}
		548
		549	=item move $dx, $dy, $img
		550
		551	Moves the image by C<$dx> pixels in the horizontal, and C<$dy> pixels in
		552	the vertical.
		553
		554	Example: move the image right by 20 pixels and down by 30.
		555
		556	move 20, 30, ...
		557
		558	=item center $img
		559
		560	=item center $width, $height, $img
		561
		562	Centers the image, i.e. the center of the image is moved to the center of
		563	the terminal window (or the box specified by C<$width> and C<$height> if
		564	given).
		565
		566	=item rootalign $img
		567
		568	Moves the image so that it appears glued to the screen as opposed to the
		569	window. This gives the illusion of a larger area behind the window. It is
		570	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the
		571	top left of the screen.
		572
		573	Example: load a background image, put it in mirror mode and root align it.
		574
		575	rootalign mirror load "mybg.png"
		576
		577	Example: take the screen background and align it, giving the illusion of
		578	transparency as long as the window isn't in front of other windows.
		579
		580	rootalign root
		581
		582	=cut
294		583
295	sub move($$;$) {	584	sub move($$;$) {
296	my $img = pop->clone;	585	my $img = pop->clone;
297	$img->move ($_[0], $_[1]);	586	$img->move ($_[0], $_[1]);
298	$img	587	$img
299	}	588	}
300		589
		590	sub center($;$$) {
		591	my $img = pop;
		592	my $w = $_[0] \|\| TW;
		593	my $h = $_[0] \|\| TH;
		594
		595	move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img
		596	}
		597
		598	sub rootalign($) {
		599	move -TX, -TY, $_[0]
		600	}
		601
		602	=back
		603
		604	=head2 COLOUR MODIFICATIONS
		605
		606	The following operators change the pixels of the image.
		607
		608	=over 4
		609
		610	=item contrast $factor, $img
		611
		612	=item contrast $r, $g, $b, $img
		613
		614	=item contrast $r, $g, $b, $a, $img
		615
		616	Adjusts the I<contrast> of an image.
		617
		618	The first form applies a single C<$factor> to red, green and blue, the
		619	second form applies separate factors to each colour channel, and the last
		620	form includes the alpha channel.
		621
		622	Values from 0 to 1 lower the contrast, values higher than 1 increase the
		623	contrast.
		624
		625	Due to limitations in the underlying XRender extension, lowering contrast
		626	also reduces brightness, while increasing contrast currently also
		627	increases brightness.
		628
		629	=item brightness $bias, $img
		630
		631	=item brightness $r, $g, $b, $img
		632
		633	=item brightness $r, $g, $b, $a, $img
		634
		635	Adjusts the brightness of an image.
		636
		637	The first form applies a single C<$bias> to red, green and blue, the
		638	second form applies separate biases to each colour channel, and the last
		639	form includes the alpha channel.
		640
		641	Values less than 0 reduce brightness, while values larger than 0 increase
		642	it. Useful range is from -1 to 1 - the former results in a black, the
		643	latter in a white picture.
		644
		645	Due to idiosynchrasies in the underlying XRender extension, biases less
		646	than zero can be I<very> slow.
		647
		648	=cut
		649
		650	sub contrast($$;$$;$) {
		651	my $img = pop;
		652	my ($r, $g, $b, $a) = @_;
		653
		654	($g, $b) = ($r, $r) if @_ < 4;
		655	$a = 1 if @_ < 5;
		656
		657	$img = $img->clone;
		658	$img->contrast ($r, $g, $b, $a);
		659	$img
		660	}
		661
		662	sub brightness($$;$$;$) {
		663	my $img = pop;
		664	my ($r, $g, $b, $a) = @_;
		665
		666	($g, $b) = ($r, $r) if @_ < 4;
		667	$a = 1 if @_ < 5;
		668
		669	$img = $img->clone;
		670	$img->brightness ($r, $g, $b, $a);
		671	$img
		672	}
		673
		674	=item blur $radius, $img
		675
		676	=item blur $radius_horz, $radius_vert, $img
		677
		678	Gaussian-blurs the image with (roughly) C<$radius> pixel radius. The radii
		679	can also be specified separately.
		680
		681	Blurring is often I<very> slow, at least compared or other
		682	operators. Larger blur radii are slower than smaller ones, too, so if you
		683	don't want to freeze your screen for long times, start experimenting with
		684	low values for radius (<5).
		685
		686	=cut
		687
		688	sub blur($$;$) {
		689	my $img = pop;
		690	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
		691	}
		692
		693	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees
		694
		695	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
		696	pointer at C<$center_x> and C<$center_y> (specified as factor of image
		697	width/height), generating a new image with width C<$new_width> and height
		698	C<$new_height>.
		699
		700	#TODO# new width, height, maybe more operators?
		701
		702	Example: rotate the image by 90 degrees
		703
		704	=cut
		705
301	sub rotate($$$$$$) {	706	sub rotate($$$$$$) {
302	my $img = pop;	707	my $img = pop;
303	$img->rotate (	708	$img->rotate (
304	$_[0],	709	$_[0],
305	$_[1],	710	$_[1],
306	$_[2] * $img->w * .01,	711	$_[2] * $img->w,
307	$_[3] * $img->h * .01,	712	$_[3] * $img->h,
308	$_[4] * (3.14159265 / 180),	713	$_[4] * (3.14159265 / 180),
309	)	714	)
310	}
311
312	sub blur($$;$) {
313	my $img = pop;
314	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
315	}
316
317	sub contrast($$;$$;$) {
318	my $img = pop;
319	my ($r, $g, $b, $a) = @_;
320
321	($g, $b) = ($r, $r) if @_ < 4;
322	$a = 1 if @_ < 5;
323
324	$img = $img->clone;
325	$img->contrast ($r, $g, $b, $a);
326	$img
327	}
328
329	sub brightness($$;$$;$) {
330	my $img = pop;
331	my ($r, $g, $b, $a) = @_;
332
333	($g, $b) = ($r, $r) if @_ < 4;
334	$a = 1 if @_ < 5;
335
336	$img = $img->clone;
337	$img->brightness ($r, $g, $b, $a);
338	$img
339	}	715	}
340		716
341	=back	717	=back
342		718
343	=cut	719	=cut
…		…
358	$self->recalculate;	734	$self->recalculate;
359	}	735	}
360		736
361	# evaluate the current bg expression	737	# evaluate the current bg expression
362	sub recalculate {	738	sub recalculate {
363	my ($self) = @_;	739	my ($arg_self) = @_;
364		740
365	# rate limit evaluation	741	# rate limit evaluation
366		742
367	if ($self->{next_refresh} > urxvt::NOW) {	743	if ($arg_self->{next_refresh} > urxvt::NOW) {
368	$self->{next_refresh_timer} = urxvt::timer->new->after ($self->{next_refresh} - urxvt::NOW)->cb (sub {	744	$arg_self->{next_refresh_timer} = urxvt::timer->new->after ($arg_self->{next_refresh} - urxvt::NOW)->cb (sub {
369	$self->recalculate;	745	$arg_self->recalculate;
370	});	746	});
371	return;	747	return;
372	}	748	}
373		749
374	$self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;	750	$arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;
375		751
376	# set environment to evaluate user expression	752	# set environment to evaluate user expression
377		753
378	local $bgdsl_self = $self;	754	local $self = $arg_self;
379		755
		756	local $HOME = $ENV{HOME};
380	local $old = $self->{state};	757	local $old = $self->{state};
381	local $new = my $state = $self->{state} = {};	758	local $new = my $state = $self->{state} = {};
382		759
383	my $border = 0; #d#
384
385	($x, $y, $w, $h) =	760	($x, $y, $w, $h) =
386	$self->background_geometry ($border);	761	$self->background_geometry ($self->{border});
387		762
388	# evaluate user expression	763	# evaluate user expression
389		764
390	my $img = eval { $self->{expr}->() };	765	my $img = eval { $self->{expr}->() };
391	warn $@ if $@;#d#	766	warn $@ if $@;#d#
392	die if !UNIVERSAL::isa $img, "urxvt::img";	767	die if !UNIVERSAL::isa $img, "urxvt::img";
393		768
		769	$state->{size_sensitive} = 1
		770	if $img->repeat_mode != urxvt::RepeatNormal;
		771
394	# if the expression is sensitive to external events, prepare reevaluation then	772	# if the expression is sensitive to external events, prepare reevaluation then
395		773
396	my $repeat;	774	my $repeat;
397		775
398	if (my $again = $state->{again}) {	776	if (my $again = $state->{again}) {
399	$repeat = 1;	777	$repeat = 1;
		778	my $self = $self;
400	$state->{timer} = $again == $old->{again}	779	$state->{timer} = $again == $old->{again}
401	? $old->{timer}	780	? $old->{timer}
402	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {	781	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
403	++$self->{counter};	782	++$self->{counter};
404	$self->recalculate	783	$self->recalculate
…		…
433	unless ($repeat) {	812	unless ($repeat) {
434	delete $self->{state};	813	delete $self->{state};
435	delete $self->{expr};	814	delete $self->{expr};
436	}	815	}
437		816
438	# prepare and set background pixmap	817	# set background pixmap
439		818
440	$img = $img->sub_rect (0, 0, $w, $h)
441	if $img->w != $w \|\| $img->h != $h;
442
443	$self->set_background ($img, $border);	819	$self->set_background ($img, $self->{border});
444	$self->scr_recolour (0);	820	$self->scr_recolour (0);
445	$self->want_refresh;	821	$self->want_refresh;
446	}	822	}
447		823
448	sub on_start {	824	sub on_start {
449	my ($self) = @_;	825	my ($self) = @_;
450		826
		827	my $expr = $self->x_resource ("background.expr")
		828	or return;
		829
451	$self->set_expr (parse_expr $EXPR);	830	$self->set_expr (parse_expr $expr);
		831	$self->{border} = $self->x_resource_boolean ("background.border");
452		832
453	()	833	()
454	}	834	}
455		835

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.32 by sf-exg, Thu Jun 7 13:56:27 2012 UTC vs. Revision 1.45 by root, Sun Jun 10 11:53:32 2012 UTC

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Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.32 by sf-exg, Thu Jun 7 13:56:27 2012 UTC vs.
Revision 1.45 by root, Sun Jun 10 11:53:32 2012 UTC