[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 1.55 by root, Thu Jun 14 16:48:57 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	#:META:X_RESOURCE:%.interval:seconds:minimum time between updates
6
7	#TODO: once, rootalign
8		6
9	=head1 NAME	7	=head1 NAME
10		8
11	background - manage terminal background	9	background - manage terminal background
12		10
59		57
60	For example, an expression such as C<scale load "$HOME/mybg.png"> scales the	58	For example, an expression such as C<scale load "$HOME/mybg.png"> scales the
61	image to the window size, so it relies on the window size and will	59	image to the window size, so it relies on the window size and will
62	be reevaluated each time it is changed, but not when it moves for	60	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	61	example. That ensures that the picture always fills the terminal, even
64	after it's size changes.	62	after its size changes.
65		63
66	=head2 EXPRESSIONS	64	=head2 EXPRESSIONS
67		65
68	Expressions are normal Perl expressions, in fact, they are Perl blocks -	66	Expressions are normal Perl expressions, in fact, they are Perl blocks -
69	which means you could use multiple lines and statements:	67	which means you could use multiple lines and statements:
…		…
73	return scale load "$HOME/weekday.png";	71	return scale load "$HOME/weekday.png";
74	} else {	72	} else {
75	return scale load "$HOME/sunday.png";	73	return scale load "$HOME/sunday.png";
76	}	74	}
77		75
78	This expression gets evaluated once per hour. It will set F<sunday.png> as	76	This expression is evaluated once per hour. It will set F<sunday.png> as
79	background on Sundays, and F<weekday.png> on all other days.	77	background on Sundays, and F<weekday.png> on all other days.
80		78
81	Fortunately, we expect that most expressions will be much simpler, with	79	Fortunately, we expect that most expressions will be much simpler, with
82	little Perl knowledge needed.	80	little Perl knowledge needed.
83		81
…		…
117	horizontal and vertical dimensions. For example, this halves the image	115	horizontal and vertical dimensions. For example, this halves the image
118	width and doubles the image height:	116	width and doubles the image height:
119		117
120	scale 0.5, 2, load "$HOME/mypic.png"	118	scale 0.5, 2, load "$HOME/mypic.png"
121		119
122	Other effects than scalign are also readily available, for exmaple, you can	120	Other effects than scaling are also readily available, for example, you can
123	tile the image to fill the whole window, instead of resizing it:	121	tile the image to fill the whole window, instead of resizing it:
124		122
125	tile load "$HOME/mypic.png"	123	tile load "$HOME/mypic.png"
126		124
127	In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator	125	In fact, images returned by C<load> are in C<tile> mode by default, so the C<tile> operator
…		…
153	This only works for one cycle though, so as long as you load the same	151	This only works for one cycle though, so as long as you load the same
154	image every time, it will always be cached, but when you load a different	152	image every time, it will always be cached, but when you load a different
155	image, it will forget about the first one.	153	image, it will forget about the first one.
156		154
157	This allows you to either speed things up by keeping multiple images in	155	This allows you to either speed things up by keeping multiple images in
158	memory, or comserve memory by loading images more often.	156	memory, or conserve memory by loading images more often.
159		157
160	For example, you can keep two images in memory and use a random one like	158	For example, you can keep two images in memory and use a random one like
161	this:	159	this:
162		160
163	my $img1 = load "img1.png";	161	my $img1 = load "img1.png";
…		…
193	Specifying this flag changes the behaviour, so that the image only	191	Specifying this flag changes the behaviour, so that the image only
194	replaces the background of the character area.	192	replaces the background of the character area.
195		193
196	=item --background-interval seconds	194	=item --background-interval seconds
197		195
198	Since some operations in the underlying XRender extension can effetively	196	Since some operations in the underlying XRender extension can effectively
199	freeze your X-server for prolonged time, this extension enforces a minimum	197	freeze your X-server for prolonged time, this extension enforces a minimum
200	time between updates, which is normally about 0.1 seconds.	198	time between updates, which is normally about 0.1 seconds.
201		199
202	If you want to do updates more often, you can decrease this safety	200	If you want to do updates more often, you can decrease this safety
203	interval with this switch.	201	interval with this switch.
204		202
205	=back	203	=back
206		204
207	=cut	205	=cut
208		206
209	our %_IMGCACHE;	207	our %_IMG_CACHE;
210	our $HOME;	208	our $HOME;
211	our ($self, $old, $new);	209	our ($self, $old, $new);
212	our ($x, $y, $w, $h);	210	our ($x, $y, $w, $h);
213		211
214	# enforce at least this interval between updates	212	# enforce at least this interval between updates
…		…
230	=item load $path	228	=item load $path
231		229
232	Loads the image at the given C<$path>. The image is set to plane tiling	230	Loads the image at the given C<$path>. The image is set to plane tiling
233	mode.	231	mode.
234		232
235	Loaded images will be cached for one cycle.	233	Loaded images will be cached for one cycle, and shared between temrinals
		234	running in the same process (e.g. in C<urxvtd>).
236		235
		236	=item load_uc $path
		237
		238	Load uncached - same as load, but does not cache the image. This function
		239	is most useufl if you want to optimise a background expression in some
		240	way.
		241
237	=cut	242	=cut
		243
		244	sub load_uc($) {
		245	my ($path) = @_;
		246
		247	$_IMG_CACHE{$path} \|\| do {
		248	my $img = $self->new_img_from_file ($path);
		249	Scalar::Util::weaken ($_IMG_CACHE{$path} = $img);
		250	$img
		251	}
		252	}
238		253
239	sub load($) {	254	sub load($) {
240	my ($path) = @_;	255	my ($path) = @_;
241		256
242	$new->{load}{$path} = $old->{load}{$path} \|\| $self->new_img_from_file ($path);	257	$new->{load}{$path} = $old->{load}{$path} \|\| load_uc $path;
243	}	258	}
244		259
245	=item root	260	=item root
246		261
247	Returns the root window pixmap, that is, hopefully, the background image	262	Returns the root window pixmap, that is, hopefully, the background image
…		…
251	reevaluated when the bg image changes.	266	reevaluated when the bg image changes.
252		267
253	=cut	268	=cut
254		269
255	sub root() {	270	sub root() {
256	$new->{rootpmap_sensitive} = 1;	271	$new->{again}{rootpmap} = 1;
257	die "root op not supported, exg, we need you";	272	$self->new_img_from_root
258	}	273	}
259		274
260	=item solid $colour	275	=item solid $colour
261		276
262	=item solid $width, $height, $colour	277	=item solid $width, $height, $colour
…		…
285	=cut	300	=cut
286		301
287	sub clone($) {	302	sub clone($) {
288	$_[0]->clone	303	$_[0]->clone
289	}	304	}
290
291	=back
292		305
293	=head2 TILING MODES	306	=head2 TILING MODES
294		307
295	The following operators modify the tiling mode of an image, that is, the	308	The following operators modify the tiling mode of an image, that is, the
296	way that pixels outside the image area are painted when the image is used.	309	way that pixels outside the image area are painted when the image is used.
…		…
326	become transparent. This mode is most useful when you want to place an	339	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	340	image over another image or the background colour while leaving all
328	background pixels outside the image unchanged.	341	background pixels outside the image unchanged.
329		342
330	Example: load an image and display it in the upper left corner. The rest	343	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	344	of the space is left "empty" (transparent or whatever your compositor does
332	in alpha mode, else background colour).	345	in alpha mode, else background colour).
333		346
334	pad load "mybg.png"	347	pad load "mybg.png"
335		348
336	=item extend $img	349	=item extend $img
337		350
338	Extends the image over the whole plane, using the closest pixel in the	351	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	352	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	353	filtering operations and want the pixels outside the image to have the
341	same values as the pixels near the edge.	354	same values as the pixels near the edge.
342		355
343	Example: just for curiosity, how does this pixel extension stuff work?	356	Example: just for curiosity, how does this pixel extension stuff work?
344		357
…		…
411	the window size to conserve memory.	424	the window size to conserve memory.
412		425
413	Example: take the screen background, clip it to the window size, blur it a	426	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.	427	bit, align it to the window position and use it as background.
415		428
416	clip move -TX, -TY, blur 5, root	429	clip move -TX, -TY, once { blur 5, root }
417		430
418	=cut	431	=cut
419		432
420	sub TX() { $new->{position_sensitive} = 1; $x }	433	sub TX() { $new->{again}{position} = 1; $x }
421	sub TY() { $new->{position_sensitive} = 1; $y }	434	sub TY() { $new->{again}{position} = 1; $y }
422	sub TW() { $new->{size_sensitive} = 1; $w }	435	sub TW() { $new->{again}{size} = 1; $w }
423	sub TH() { $new->{size_sensitive} = 1; $h }	436	sub TH() { $new->{again}{size} = 1; $h }
424		437
425	=item now	438	=item now
426		439
427	Returns the current time as (fractional) seconds since the epoch.	440	Returns the current time as (fractional) seconds since the epoch.
428		441
…		…
435	C<$seconds> seconds.	448	C<$seconds> seconds.
436		449
437	Example: load some image and rotate it according to the time of day (as if it were	450	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.	451	the hour pointer of a clock). Update this image every minute.
439		452
440	again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"	453	again 60; rotate 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"
441		454
442	=item counter $seconds	455	=item counter $seconds
443		456
444	Like C<again>, but also returns an increasing counter value, starting at	457	Like C<again>, but also returns an increasing counter value, starting at
445	0, which might be useful for some simple animation effects.	458	0, which might be useful for some simple animation effects.
…		…
447	=cut	460	=cut
448		461
449	sub now() { urxvt::NOW }	462	sub now() { urxvt::NOW }
450		463
451	sub again($) {	464	sub again($) {
452	$new->{again} = $_[0];	465	$new->{again}{time} = $_[0];
453	}	466	}
454		467
455	sub counter($) {	468	sub counter($) {
456	$new->{again} = $_[0];	469	$new->{again}{time} = $_[0];
457	$self->{counter} + 0	470	$self->{counter} + 0
458	}	471	}
459		472
460	=back	473	=back
461		474
…		…
632		645
633	sub rootalign($) {	646	sub rootalign($) {
634	move -TX, -TY, $_[0]	647	move -TX, -TY, $_[0]
635	}	648	}
636		649
		650	=item rotate $center_x, $center_y, $degrees
		651
		652	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
		653	pointer at C<$center_x> and C<$center_y> (specified as factor of image
		654	width/height).
		655
		656	#TODO# new width, height, maybe more operators?
		657
		658	Example: rotate the image by 90 degrees
		659
		660	=cut
		661
		662	sub rotate($$$$) {
		663	my $img = pop;
		664	$img->rotate (
		665	$_[0] * $img->w,
		666	$_[1] * $img->h,
		667	$_[2] * (3.14159265 / 180),
		668	)
		669	}
		670
637	=back	671	=back
638		672
639	=head2 COLOUR MODIFICATIONS	673	=head2 COLOUR MODIFICATIONS
640		674
641	The following operators change the pixels of the image.	675	The following operators change the pixels of the image.
…		…
675		709
676	Values less than 0 reduce brightness, while values larger than 0 increase	710	Values less than 0 reduce brightness, while values larger than 0 increase
677	it. Useful range is from -1 to 1 - the former results in a black, the	711	it. Useful range is from -1 to 1 - the former results in a black, the
678	latter in a white picture.	712	latter in a white picture.
679		713
680	Due to idiosynchrasies in the underlying XRender extension, biases less	714	Due to idiosyncrasies in the underlying XRender extension, biases less
681	than zero can be I<very> slow.	715	than zero can be I<very> slow.
682		716
683	=cut	717	=cut
684		718
685	sub contrast($$;$$;$) {	719	sub contrast($$;$$;$) {
…		…
723	sub blur($$;$) {	757	sub blur($$;$) {
724	my $img = pop;	758	my $img = pop;
725	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])	759	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
726	}	760	}
727		761
728	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees	762	=back
729		763
730	Rotates the image by C<$degrees> degrees, counter-clockwise, around the	764	=head2 OTHER STUFF
731	pointer at C<$center_x> and C<$center_y> (specified as factor of image
732	width/height), generating a new image with width C<$new_width> and height
733	C<$new_height>.
734		765
735	#TODO# new width, height, maybe more operators?	766	Anything that didn't fit any of the other categories, even after appliyng
		767	force and closing our eyes.
736		768
737	Example: rotate the image by 90 degrees	769	=over 4
738		770
739	=cut	771	=item once { ... }
740		772
741	sub rotate($$$$$$) {	773	This function takes a code block as argument, that is, one or more
742	my $img = pop;	774	statements enclosed by braces.
743	$img->rotate (	775
744	$_[0],	776	The trick is that this code block is only evaluated once - future calls
745	$_[1],	777	will simply return the original image (yes, it should only be used with
746	$_[2] * $img->w,	778	images).
747	$_[3] * $img->h,	779
748	$_[4] * (3.14159265 / 180),	780	This can be extremely useful to avoid redoign the same slow operations
		781	again and again- for example, if your background expression takes the root
		782	background, blurs it and then root-aligns it it would have to blur the
		783	root background on every window move or resize.
		784
		785	Putting the blur into a C<once> block will make sure the blur is only done
		786	once:
		787
		788	rootlign once { blur 10, root }
		789
		790	This leaves the question of how to force reevaluation of the block, in
		791	case the root background changes: Right now, all once blocks forget that
		792	they ahve been executed before each time the root background changes (if
		793	the expression is sensitive to that) or when C<once_again> is called.
		794
		795	=item once_again
		796
		797	Resets all C<once> block as if they had never been called, i.e. on the
		798	next call they will be reevaluated again.
		799
		800	=cut
		801
		802	sub once(&) {
		803	my $once = $self->{once_cache}{$_[0]+0} \|\|= do {
		804	local $new->{again};
		805	my @res = $_[0]();
		806	[$new->{again}, \@res]
749	)	807	};
		808
		809	$new->{again} = {
		810	%{ $new->{again} },
		811	%{ $once->[0] }
		812	};
		813
		814	# in scalar context we always return the first original result, which
		815	# is not quite how perl works.
		816	wantarray
		817	? @{ $once->[1] }
		818	: $once->[1][0]
		819	}
		820
		821	sub once_again() {
		822	delete $self->{once_cache};
750	}	823	}
751		824
752	=back	825	=back
753		826
754	=cut	827	=cut
…		…
799		872
800	my $img = eval { $self->{expr}->() };	873	my $img = eval { $self->{expr}->() };
801	warn $@ if $@;#d#	874	warn $@ if $@;#d#
802	die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img";	875	die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img";
803		876
804	$state->{size_sensitive} = 1	877	# if the expression is sensitive to external events, prepare reevaluation then
		878
		879	my $again = delete $state->{again};
		880
		881	$again->{size} = 1
805	if $img->repeat_mode != urxvt::RepeatNormal;	882	if $img->repeat_mode != urxvt::RepeatNormal;
806		883
807	# if the expression is sensitive to external events, prepare reevaluation then
808
809	my $repeat;
810
811	if (my $again = $state->{again}) {	884	if (my $again = $again->{time}) {
812	$repeat = 1;
813	my $self = $self;	885	my $self = $self;
814	$state->{timer} = $again == $old->{again}	886	$state->{timer} = $again == $old->{again}
815	? $old->{timer}	887	? $old->{timer}
816	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {	888	: urxvt::timer->new->after ($again)->interval ($again)->cb (sub {
817	++$self->{counter};	889	++$self->{counter};
818	$self->recalculate	890	$self->recalculate
819	});	891	});
820	}	892	}
821		893
822	if (delete $state->{position_sensitive}) {	894	if ($again->{position}) {
823	$repeat = 1;
824	$self->enable (position_change => sub { $_[0]->recalculate });	895	$self->enable (position_change => sub { $_[0]->recalculate });
825	} else {	896	} else {
826	$self->disable ("position_change");	897	$self->disable ("position_change");
827	}	898	}
828		899
829	if (delete $state->{size_sensitive}) {	900	if ($again->{size}) {
830	$repeat = 1;
831	$self->enable (size_change => sub { $_[0]->recalculate });	901	$self->enable (size_change => sub { $_[0]->recalculate });
832	} else {	902	} else {
833	$self->disable ("size_change");	903	$self->disable ("size_change");
834	}	904	}
835		905
836	if (delete $state->{rootpmap_sensitive}) {	906	if ($again->{rootpmap}) {
837	$repeat = 1;
838	$self->enable (rootpmap_change => sub { $_[0]->recalculate });	907	$self->enable (rootpmap_change => sub {
		908	delete $_[0]{once_cache}; # this will override once-block values from
		909	$_[0]->recalculate;
		910	});
839	} else {	911	} else {
840	$self->disable ("rootpmap_change");	912	$self->disable ("rootpmap_change");
841	}	913	}
842		914
843	# clear stuff we no longer need	915	# clear stuff we no longer need
844		916
845	%$old = ();	917	%$old = ();
846		918
847	unless ($repeat) {	919	unless (%$again) {
848	delete $self->{state};	920	delete $self->{state};
849	delete $self->{expr};	921	delete $self->{expr};
850	}	922	}
851		923
852	# set background pixmap	924	# set background pixmap

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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 1.55 by root, Thu Jun 14 16:48:57 2012 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 1.55 by root, Thu Jun 14 16:48:57 2012 UTC