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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.47 by root, Sun Jun 10 13:58:05 2012 UTC vs.
Revision 1.53 by root, Tue Jun 12 18:25:57 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:
…		…
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
		207	our %_IMG_CACHE;
		208	our %_ONCE_CACHE;
209	our $HOME;	209	our $HOME;
210	our ($self, $old, $new);	210	our ($self, $old, $new);
211	our ($x, $y, $w, $h);	211	our ($x, $y, $w, $h);
212		212
213	# enforce at least this interval between updates	213	# enforce at least this interval between updates
…		…
251		251
252	=cut	252	=cut
253		253
254	sub root() {	254	sub root() {
255	$new->{rootpmap_sensitive} = 1;	255	$new->{rootpmap_sensitive} = 1;
256	die "root op not supported, exg, we need you";	256	$self->new_img_from_root
257	}	257	}
258		258
259	=item solid $colour	259	=item solid $colour
260		260
261	=item solid $width, $height, $colour	261	=item solid $width, $height, $colour
…		…
284	=cut	284	=cut
285		285
286	sub clone($) {	286	sub clone($) {
287	$_[0]->clone	287	$_[0]->clone
288	}	288	}
289
290	=back
291		289
292	=head2 TILING MODES	290	=head2 TILING MODES
293		291
294	The following operators modify the tiling mode of an image, that is, the	292	The following operators modify the tiling mode of an image, that is, the
295	way that pixels outside the image area are painted when the image is used.	293	way that pixels outside the image area are painted when the image is used.
…		…
325	become transparent. This mode is most useful when you want to place an	323	become transparent. This mode is most useful when you want to place an
326	image over another image or the background colour while leaving all	324	image over another image or the background colour while leaving all
327	background pixels outside the image unchanged.	325	background pixels outside the image unchanged.
328		326
329	Example: load an image and display it in the upper left corner. The rest	327	Example: load an image and display it in the upper left corner. The rest
330	of the space is left "empty" (transparent or wahtever your compisotr does	328	of the space is left "empty" (transparent or whatever your compositor does
331	in alpha mode, else background colour).	329	in alpha mode, else background colour).
332		330
333	pad load "mybg.png"	331	pad load "mybg.png"
334		332
335	=item extend $img	333	=item extend $img
336		334
337	Extends the image over the whole plane, using the closest pixel in the	335	Extends the image over the whole plane, using the closest pixel in the
338	area outside the image. This mode is mostly useful when you more complex	336	area outside the image. This mode is mostly useful when you use more complex
339	filtering operations and want the pixels outside the image to have the	337	filtering operations and want the pixels outside the image to have the
340	same values as the pixels near the edge.	338	same values as the pixels near the edge.
341		339
342	Example: just for curiosity, how does this pixel extension stuff work?	340	Example: just for curiosity, how does this pixel extension stuff work?
343		341
…		…
434	C<$seconds> seconds.	432	C<$seconds> seconds.
435		433
436	Example: load some image and rotate it according to the time of day (as if it were	434	Example: load some image and rotate it according to the time of day (as if it were
437	the hour pointer of a clock). Update this image every minute.	435	the hour pointer of a clock). Update this image every minute.
438		436
439	again 60; rotate TW, TH, 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"	437	again 60; rotate 50, 50, (now % 86400) * -720 / 86400, scale load "myclock.png"
440		438
441	=item counter $seconds	439	=item counter $seconds
442		440
443	Like C<again>, but also returns an increasing counter value, starting at	441	Like C<again>, but also returns an increasing counter value, starting at
444	0, which might be useful for some simple animation effects.	442	0, which might be useful for some simple animation effects.
…		…
631		629
632	sub rootalign($) {	630	sub rootalign($) {
633	move -TX, -TY, $_[0]	631	move -TX, -TY, $_[0]
634	}	632	}
635		633
		634	=item rotate $center_x, $center_y, $degrees
		635
		636	Rotates the image by C<$degrees> degrees, counter-clockwise, around the
		637	pointer at C<$center_x> and C<$center_y> (specified as factor of image
		638	width/height).
		639
		640	#TODO# new width, height, maybe more operators?
		641
		642	Example: rotate the image by 90 degrees
		643
		644	=cut
		645
		646	sub rotate($$$$) {
		647	my $img = pop;
		648	$img->rotate (
		649	$_[0] * $img->w,
		650	$_[1] * $img->h,
		651	$_[2] * (3.14159265 / 180),
		652	)
		653	}
		654
636	=back	655	=back
637		656
638	=head2 COLOUR MODIFICATIONS	657	=head2 COLOUR MODIFICATIONS
639		658
640	The following operators change the pixels of the image.	659	The following operators change the pixels of the image.
…		…
674		693
675	Values less than 0 reduce brightness, while values larger than 0 increase	694	Values less than 0 reduce brightness, while values larger than 0 increase
676	it. Useful range is from -1 to 1 - the former results in a black, the	695	it. Useful range is from -1 to 1 - the former results in a black, the
677	latter in a white picture.	696	latter in a white picture.
678		697
679	Due to idiosynchrasies in the underlying XRender extension, biases less	698	Due to idiosyncrasies in the underlying XRender extension, biases less
680	than zero can be I<very> slow.	699	than zero can be I<very> slow.
681		700
682	=cut	701	=cut
683		702
684	sub contrast($$;$$;$) {	703	sub contrast($$;$$;$) {
685	my $img = pop;	704	my $img = pop;
686	my ($r, $g, $b, $a) = @_;	705	my ($r, $g, $b, $a) = @_;
687		706
688	($g, $b) = ($r, $r) if @_ < 4;	707	($g, $b) = ($r, $r) if @_ < 3;
689	$a = 1 if @_ < 5;	708	$a = 1 if @_ < 4;
690		709
691	$img = $img->clone;	710	$img = $img->clone;
692	$img->contrast ($r, $g, $b, $a);	711	$img->contrast ($r, $g, $b, $a);
693	$img	712	$img
694	}	713	}
695		714
696	sub brightness($$;$$;$) {	715	sub brightness($$;$$;$) {
697	my $img = pop;	716	my $img = pop;
698	my ($r, $g, $b, $a) = @_;	717	my ($r, $g, $b, $a) = @_;
699		718
700	($g, $b) = ($r, $r) if @_ < 4;	719	($g, $b) = ($r, $r) if @_ < 3;
701	$a = 1 if @_ < 5;	720	$a = 1 if @_ < 4;
702		721
703	$img = $img->clone;	722	$img = $img->clone;
704	$img->brightness ($r, $g, $b, $a);	723	$img->brightness ($r, $g, $b, $a);
705	$img	724	$img
706	}	725	}
…		…
722	sub blur($$;$) {	741	sub blur($$;$) {
723	my $img = pop;	742	my $img = pop;
724	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])	743	$img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0])
725	}	744	}
726		745
727	=item rotate $new_width, $new_height, $center_x, $center_y, $degrees	746	=back
728		747
729	Rotates the image by C<$degrees> degrees, counter-clockwise, around the	748	=head2 OTHER STUFF
730	pointer at C<$center_x> and C<$center_y> (specified as factor of image
731	width/height), generating a new image with width C<$new_width> and height
732	C<$new_height>.
733		749
734	#TODO# new width, height, maybe more operators?	750	Anything that didn't fit any of the other categories, even after appliyng
		751	force and closing our eyes.
735		752
736	Example: rotate the image by 90 degrees	753	=over 4
737		754
738	=cut	755	=item once { ... }
739		756
740	sub rotate($$$$$$) {	757	This function takes a code block as argument, that is, one or more
741	my $img = pop;	758	statements enclosed by braces.
742	$img->rotate (	759
743	$_[0],	760	The trick is that this code block is only evaluated once - future calls
744	$_[1],	761	will simply return the original image (yes, it should only be used with
745	$_[2] * $img->w,	762	images).
746	$_[3] * $img->h,	763
747	$_[4] * (3.14159265 / 180),	764	This can be extremely useful to avoid redoign the same slow operations
748	)	765	again and again- for example, if your background expression takes the root
		766	background, blurs it and then root-aligns it it would have to blur the
		767	root background on every window move or resize.
		768
		769	Putting the blur into a C<once> block will make sure the blur is only done
		770	once:
		771
		772	rootlign once { blur 10, root }
		773
		774	This leaves the question of how to force reevaluation of the block, in
		775	case the root background changes: Right now, all once blocks forget that
		776	they ahve been executed before each time the root background changes (if
		777	the expression is sensitive to that) or when C<once_again> is called.
		778
		779	=item once_again
		780
		781	Resets all C<once> block as if they had never been called, i.e. on the
		782	next call they will be reevaluated again.
		783
		784	=cut
		785
		786	sub once(&) {
		787	$_ONCE_CACHE{$_[0]+0} \|\|= $_[0]()
		788	}
		789
		790	sub once_again() {
		791	%_ONCE_CACHE = ();
749	}	792	}
750		793
751	=back	794	=back
752		795
753	=cut	796	=cut
…		…
796		839
797	# evaluate user expression	840	# evaluate user expression
798		841
799	my $img = eval { $self->{expr}->() };	842	my $img = eval { $self->{expr}->() };
800	warn $@ if $@;#d#	843	warn $@ if $@;#d#
801	die if !UNIVERSAL::isa $img, "urxvt::img";	844	die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img";
802		845
803	$state->{size_sensitive} = 1	846	$state->{size_sensitive} = 1
804	if $img->repeat_mode != urxvt::RepeatNormal;	847	if $img->repeat_mode != urxvt::RepeatNormal;
805		848
806	# if the expression is sensitive to external events, prepare reevaluation then	849	# if the expression is sensitive to external events, prepare reevaluation then
…		…
859	my ($self) = @_;	902	my ($self) = @_;
860		903
861	my $expr = $self->x_resource ("%.expr")	904	my $expr = $self->x_resource ("%.expr")
862	or return;	905	or return;
863		906
		907	$self->has_render
		908	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";
		909
864	$self->set_expr (parse_expr $expr);	910	$self->set_expr (parse_expr $expr);
865	$self->{border} = $self->x_resource_boolean ("%.border");	911	$self->{border} = $self->x_resource_boolean ("%.border");
866		912
867	$MIN_INTERVAL = $self->x_resource ("%.interval");	913	$MIN_INTERVAL = $self->x_resource ("%.interval");
868		914

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.47 by root, Sun Jun 10 13:58:05 2012 UTC vs. Revision 1.53 by root, Tue Jun 12 18:25:57 2012 UTC

Diff Legend

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.47 by root, Sun Jun 10 13:58:05 2012 UTC vs.
Revision 1.53 by root, Tue Jun 12 18:25:57 2012 UTC