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

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.43 by root, Sun Jun 10 11:23:20 2012 UTC vs.
Revision 1.50 by root, Sun Jun 10 17:31:53 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		5	#:META:X_RESOURCE:%.interval:seconds:minimum time between updates
6	#TODO: once, rootalign
7		6
8	=head1 NAME	7	=head1 NAME
9		8
10	background - manage terminal background	9	background - manage terminal background
11		10
12	=head1 SYNOPSIS	11	=head1 SYNOPSIS
13		12
14	urxvt --background-expr 'background expression'	13	urxvt --background-expr 'background expression'
15	--background-border	14	--background-border
		15	--background-interval seconds
16		16
17	=head1 DESCRIPTION	17	=head1 DESCRIPTION
18		18
19	This extension manages the terminal background by creating a picture that	19	This extension manages the terminal background by creating a picture that
20	is behind the text, replacing the normal background colour.	20	is behind the text, replacing the normal background colour.
189	overwriting borders and any other areas, such as the scrollbar.	189	overwriting borders and any other areas, such as the scrollbar.
190		190
191	Specifying this flag changes the behaviour, so that the image only	191	Specifying this flag changes the behaviour, so that the image only
192	replaces the background of the character area.	192	replaces the background of the character area.
193		193
		194	=item --background-interval seconds
		195
		196	Since some operations in the underlying XRender extension can effetively
		197	freeze your X-server for prolonged time, this extension enforces a minimum
		198	time between updates, which is normally about 0.1 seconds.
		199
		200	If you want to do updates more often, you can decrease this safety
		201	interval with this switch.
		202
194	=back	203	=back
195		204
196	=cut	205	=cut
197		206
		207	our %_IMGCACHE;
198	our $HOME;	208	our $HOME;
199	our ($self, $old, $new);	209	our ($self, $old, $new);
200	our ($x, $y, $w, $h);	210	our ($x, $y, $w, $h);
201		211
202	# enforce at least this interval between updates	212	# enforce at least this interval between updates
203	our $MIN_INTERVAL = 1/100;	213	our $MIN_INTERVAL = 6/59.951;
204		214
205	{	215	{
206	package urxvt::bgdsl; # background language	216	package urxvt::bgdsl; # background language
207		217
208	use List::Util qw(min max sum shuffle);	218	use List::Util qw(min max sum shuffle);
…		…
263	my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] \|\| 1, $_[1] \|\| 1);	273	my $img = $self->new_img (urxvt::PictStandardARGB32, $_[0] \|\| 1, $_[1] \|\| 1);
264	$img->fill ($colour);	274	$img->fill ($colour);
265	$img	275	$img
266	}	276	}
267		277
		278	=item clone $img
		279
		280	Returns an exact copy of the image. This is useful if you want to have
		281	multiple copies of the same image to apply different effects to.
		282
		283	=cut
		284
		285	sub clone($) {
		286	$_[0]->clone
		287	}
		288
268	=back	289	=back
269		290
		291	=head2 TILING MODES
		292
		293	The following operators modify the tiling mode of an image, that is, the
		294	way that pixels outside the image area are painted when the image is used.
		295
		296	=over 4
		297
		298	=item tile $img
		299
		300	Tiles the whole plane with the image and returns this new image - or in
		301	other words, it returns a copy of the image in plane tiling mode.
		302
		303	Example: load an image and tile it over the background, without
		304	resizing. The C<tile> call is superfluous because C<load> already defaults
		305	to tiling mode.
		306
		307	tile load "mybg.png"
		308
		309	=item mirror $img
		310
		311	Similar to tile, but reflects the image each time it uses a new copy, so
		312	that top edges always touch top edges, right edges always touch right
		313	edges and so on (with normal tiling, left edges always touch right edges
		314	and top always touch bottom edges).
		315
		316	Example: load an image and mirror it over the background, avoiding sharp
		317	edges at the image borders at the expense of mirroring the image itself
		318
		319	mirror load "mybg.png"
		320
		321	=item pad $img
		322
		323	Takes an image and modifies it so that all pixels outside the image area
		324	become transparent. This mode is most useful when you want to place an
		325	image over another image or the background colour while leaving all
		326	background pixels outside the image unchanged.
		327
		328	Example: load an image and display it in the upper left corner. The rest
		329	of the space is left "empty" (transparent or wahtever your compisotr does
		330	in alpha mode, else background colour).
		331
		332	pad load "mybg.png"
		333
		334	=item extend $img
		335
		336	Extends the image over the whole plane, using the closest pixel in the
		337	area outside the image. This mode is mostly useful when you more complex
		338	filtering operations and want the pixels outside the image to have the
		339	same values as the pixels near the edge.
		340
		341	Example: just for curiosity, how does this pixel extension stuff work?
		342
		343	extend move 50, 50, load "mybg.png"
		344
		345	=cut
		346
		347	sub pad($) {
		348	my $img = $_[0]->clone;
		349	$img->repeat_mode (urxvt::RepeatNone);
		350	$img
		351	}
		352
		353	sub tile($) {
		354	my $img = $_[0]->clone;
		355	$img->repeat_mode (urxvt::RepeatNormal);
		356	$img
		357	}
		358
		359	sub mirror($) {
		360	my $img = $_[0]->clone;
		361	$img->repeat_mode (urxvt::RepeatReflect);
		362	$img
		363	}
		364
		365	sub extend($) {
		366	my $img = $_[0]->clone;
		367	$img->repeat_mode (urxvt::RepeatPad);
		368	$img
		369	}
		370
		371	=back
		372
270	=head2 VARIABLES	373	=head2 VARIABLE VALUES
271		374
272	The following functions provide variable data such as the terminal window	375	The following functions provide variable data such as the terminal window
273	dimensions. They are not (Perl-) variables, they jsut return stuff that	376	dimensions. They are not (Perl-) variables, they just return stuff that
274	varies. Most of them make your expression sensitive to some events, for	377	varies. Most of them make your expression sensitive to some events, for
275	example using C<TW> (terminal width) means your expression is evaluated	378	example using C<TW> (terminal width) means your expression is evaluated
276	again when the terminal is resized.	379	again when the terminal is resized.
277		380
278	=over 4	381	=over 4
…		…
352	$self->{counter} + 0	455	$self->{counter} + 0
353	}	456	}
354		457
355	=back	458	=back
356		459
357	=head2 TILING MODES	460	=head2 SHAPE CHANGING OPERATORS
358		461
359	The following operators modify the tiling mode of an image, that is, the	462	The following operators modify the shape, size or position of the image.
360	way that pixels outside the image area are painted when the image is used.
361		463
362	=over 4	464	=over 4
363
364	=item tile $img
365
366	Tiles the whole plane with the image and returns this new image - or in
367	other words, it returns a copy of the image in plane tiling mode.
368
369	Example: load an image and tile it over the background, without
370	resizing. The C<tile> call is superfluous because C<load> already defaults
371	to tiling mode.
372
373	tile load "mybg.png"
374
375	=item mirror $img
376
377	Similar to tile, but reflects the image each time it uses a new copy, so
378	that top edges always touch top edges, right edges always touch right
379	edges and so on (with normal tiling, left edges always touch right edges
380	and top always touch bottom edges).
381
382	Example: load an image and mirror it over the background, avoiding sharp
383	edges at the image borders at the expense of mirroring the image itself
384
385	mirror load "mybg.png"
386
387	=item pad $img
388
389	Takes an image and modifies it so that all pixels outside the image area
390	become transparent. This mode is most useful when you want to place an
391	image over another image or the background colour while leaving all
392	background pixels outside the image unchanged.
393
394	Example: load an image and display it in the upper left corner. The rest
395	of the space is left "empty" (transparent or wahtever your compisotr does
396	in alpha mode, else background colour).
397
398	pad load "mybg.png"
399
400	=item extend $img
401
402	Extends the image over the whole plane, using the closest pixel in the
403	area outside the image. This mode is mostly useful when you more complex
404	filtering operations and want the pixels outside the image to have the
405	same values as the pixels near the edge.
406
407	Example: just for curiosity, how does this pixel extension stuff work?
408
409	extend move 50, 50, load "mybg.png"
410
411	=cut
412
413	sub pad($) {
414	my $img = $_[0]->clone;
415	$img->repeat_mode (urxvt::RepeatNone);
416	$img
417	}
418
419	sub tile($) {
420	my $img = $_[0]->clone;
421	$img->repeat_mode (urxvt::RepeatNormal);
422	$img
423	}
424
425	sub mirror($) {
426	my $img = $_[0]->clone;
427	$img->repeat_mode (urxvt::RepeatReflect);
428	$img
429	}
430
431	sub extend($) {
432	my $img = $_[0]->clone;
433	$img->repeat_mode (urxvt::RepeatPad);
434	$img
435	}
436
437	=back
438
439	=head2 PIXEL OPERATORS
440
441	The following operators modify the image pixels in various ways.
442
443	=over 4
444
445	=item clone $img
446
447	Returns an exact copy of the image.
448
449	=cut
450
451	sub clone($) {
452	$_[0]->clone
453	}
454		465
455	=item clip $img	466	=item clip $img
456		467
457	=item clip $width, $height, $img	468	=item clip $width, $height, $img
458		469
…		…
552		563
553	Example: move the image right by 20 pixels and down by 30.	564	Example: move the image right by 20 pixels and down by 30.
554		565
555	move 20, 30, ...	566	move 20, 30, ...
556		567
		568	=item align $xalign, $yalign, $img
		569
		570	Aligns the image according to a factor - C<0> means the image is moved to
		571	the left or top edge (for C<$xalign> or C<$yalign>), C<0.5> means it is
		572	exactly centered and C<1> means it touches the right or bottom edge.
		573
		574	Example: remove any visible border around an image, center it vertically but move
		575	it to the right hand side.
		576
		577	align 1, 0.5, pad $img
		578
		579	=item center $img
		580
		581	=item center $width, $height, $img
		582
		583	Centers the image, i.e. the center of the image is moved to the center of
		584	the terminal window (or the box specified by C<$width> and C<$height> if
		585	given).
		586
		587	Example: load an image and center it.
		588
		589	center pad load "mybg.png"
		590
557	=item rootalign $img	591	=item rootalign $img
558		592
559	Moves the image so that it appears glued to the screen as opposed to the	593	Moves the image so that it appears glued to the screen as opposed to the
560	window. This gives the illusion of a larger area behind the window. It is	594	window. This gives the illusion of a larger area behind the window. It is
561	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the	595	exactly equivalent to C<move -TX, -TY>, that is, it moves the image to the
…		…
566	rootalign mirror load "mybg.png"	600	rootalign mirror load "mybg.png"
567		601
568	Example: take the screen background and align it, giving the illusion of	602	Example: take the screen background and align it, giving the illusion of
569	transparency as long as the window isn't in front of other windows.	603	transparency as long as the window isn't in front of other windows.
570		604
571	rootalign root	605	rootalign root
572		606
573	=cut	607	=cut
574		608
575	sub move($$;$) {	609	sub move($$;$) {
576	my $img = pop->clone;	610	my $img = pop->clone;
577	$img->move ($_[0], $_[1]);	611	$img->move ($_[0], $_[1]);
578	$img	612	$img
579	}	613	}
580		614
		615	sub align($;$$) {
		616	my $img = pop;
		617
		618	move $_[0] * (TW - $img->w),
		619	$_[1] * (TH - $img->h),
		620	$img
		621	}
		622
		623	sub center($;$$) {
		624	my $img = pop;
		625	my $w = $_[0] \|\| TW;
		626	my $h = $_[1] \|\| TH;
		627
		628	move 0.5 * ($w - $img->w), 0.5 * ($h - $img->h), $img
		629	}
		630
581	sub rootalign($) {	631	sub rootalign($) {
582	move -TX, -TY, $_[0]	632	move -TX, -TY, $_[0]
583	}	633	}
584		634
		635	=back
		636
		637	=head2 COLOUR MODIFICATIONS
		638
		639	The following operators change the pixels of the image.
		640
		641	=over 4
		642
585	=item contrast $factor, $img	643	=item contrast $factor, $img
586		644
587	=item contrast $r, $g, $b, $img	645	=item contrast $r, $g, $b, $img
588		646
589	=item contrast $r, $g, $b, $a, $img	647	=item contrast $r, $g, $b, $a, $img
590		648
591	Adjusts the I<contrast> of an image.	649	Adjusts the I<contrast> of an image.
592		650
593	#TODO#	651	The first form applies a single C<$factor> to red, green and blue, the
		652	second form applies separate factors to each colour channel, and the last
		653	form includes the alpha channel.
594		654
		655	Values from 0 to 1 lower the contrast, values higher than 1 increase the
		656	contrast.
		657
		658	Due to limitations in the underlying XRender extension, lowering contrast
		659	also reduces brightness, while increasing contrast currently also
		660	increases brightness.
		661
595	=item brightness $factor, $img	662	=item brightness $bias, $img
596		663
597	=item brightness $r, $g, $b, $img	664	=item brightness $r, $g, $b, $img
598		665
599	=item brightness $r, $g, $b, $a, $img	666	=item brightness $r, $g, $b, $a, $img
600		667
601	Adjusts the brightness of an image.	668	Adjusts the brightness of an image.
602		669
		670	The first form applies a single C<$bias> to red, green and blue, the
		671	second form applies separate biases to each colour channel, and the last
		672	form includes the alpha channel.
		673
		674	Values less than 0 reduce brightness, while values larger than 0 increase
		675	it. Useful range is from -1 to 1 - the former results in a black, the
		676	latter in a white picture.
		677
		678	Due to idiosynchrasies in the underlying XRender extension, biases less
		679	than zero can be I<very> slow.
		680
603	=cut	681	=cut
604		682
605	sub contrast($$;$$;$) {	683	sub contrast($$;$$;$) {
606	my $img = pop;	684	my $img = pop;
607	my ($r, $g, $b, $a) = @_;	685	my ($r, $g, $b, $a) = @_;
608		686
609	($g, $b) = ($r, $r) if @_ < 4;	687	($g, $b) = ($r, $r) if @_ < 3;
610	$a = 1 if @_ < 5;	688	$a = 1 if @_ < 4;
611		689
612	$img = $img->clone;	690	$img = $img->clone;
613	$img->contrast ($r, $g, $b, $a);	691	$img->contrast ($r, $g, $b, $a);
614	$img	692	$img
615	}	693	}
616		694
617	sub brightness($$;$$;$) {	695	sub brightness($$;$$;$) {
618	my $img = pop;	696	my $img = pop;
619	my ($r, $g, $b, $a) = @_;	697	my ($r, $g, $b, $a) = @_;
620		698
621	($g, $b) = ($r, $r) if @_ < 4;	699	($g, $b) = ($r, $r) if @_ < 3;
622	$a = 1 if @_ < 5;	700	$a = 1 if @_ < 4;
623		701
624	$img = $img->clone;	702	$img = $img->clone;
625	$img->brightness ($r, $g, $b, $a);	703	$img->brightness ($r, $g, $b, $a);
626	$img	704	$img
627	}	705	}
…		…
717		795
718	# evaluate user expression	796	# evaluate user expression
719		797
720	my $img = eval { $self->{expr}->() };	798	my $img = eval { $self->{expr}->() };
721	warn $@ if $@;#d#	799	warn $@ if $@;#d#
722	die if !UNIVERSAL::isa $img, "urxvt::img";	800	die "background-expr did not return an image.\n" if !UNIVERSAL::isa $img, "urxvt::img";
723		801
724	$state->{size_sensitive} = 1	802	$state->{size_sensitive} = 1
725	if $img->repeat_mode != urxvt::RepeatNormal;	803	if $img->repeat_mode != urxvt::RepeatNormal;
726		804
727	# if the expression is sensitive to external events, prepare reevaluation then	805	# if the expression is sensitive to external events, prepare reevaluation then
…		…
777	}	855	}
778		856
779	sub on_start {	857	sub on_start {
780	my ($self) = @_;	858	my ($self) = @_;
781		859
782	my $expr = $self->x_resource ("background.expr")	860	my $expr = $self->x_resource ("%.expr")
783	or return;	861	or return;
784		862
		863	$self->has_render
		864	or die "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";
		865
785	$self->set_expr (parse_expr $expr);	866	$self->set_expr (parse_expr $expr);
786	$self->{border} = $self->x_resource_boolean ("background.border");	867	$self->{border} = $self->x_resource_boolean ("%.border");
		868
		869	$MIN_INTERVAL = $self->x_resource ("%.interval");
787		870
788	()	871	()
789	}	872	}
790		873

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Comparing rxvt-unicode/src/perl/background (file contents): Revision 1.43 by root, Sun Jun 10 11:23:20 2012 UTC vs. Revision 1.50 by root, Sun Jun 10 17:31:53 2012 UTC

Diff Legend

Comparing rxvt-unicode/src/perl/background (file contents):
Revision 1.43 by root, Sun Jun 10 11:23:20 2012 UTC vs.
Revision 1.50 by root, Sun Jun 10 17:31:53 2012 UTC