1 | #! perl |
1 | #! perl |
2 | |
2 | |
3 | #:META:X_RESOURCE:%.expr:string:background expression |
3 | #:META:RESOURCE:%.expr:string:background expression |
4 | #:META:X_RESOURCE:%.border:boolean:respect the terminal border |
4 | #:META:RESOURCE:%.border:boolean:respect the terminal border |
5 | #:META:X_RESOURCE:%.interval:seconds:minimum time between updates |
5 | #:META:RESOURCE:%.interval:seconds:minimum time between updates |
6 | |
6 | |
7 | =head1 NAME |
7 | =head1 NAME |
8 | |
8 | |
9 | background - manage terminal background |
9 | background - manage terminal background |
10 | |
10 | |
11 | =head1 SYNOPSIS |
11 | =head1 SYNOPSIS |
12 | |
12 | |
13 | urxvt --background-expr 'background expression' |
13 | urxvt --background-expr 'background expression' |
14 | --background-border |
14 | --background-border |
… | |
… | |
279 | =cut |
279 | =cut |
280 | |
280 | |
281 | our %_IMG_CACHE; |
281 | our %_IMG_CACHE; |
282 | our $HOME; |
282 | our $HOME; |
283 | our ($self, $frame); |
283 | our ($self, $frame); |
284 | our ($x, $y, $w, $h); |
284 | our ($x, $y, $w, $h, $focus); |
285 | |
285 | |
286 | # enforce at least this interval between updates |
286 | # enforce at least this interval between updates |
287 | our $MIN_INTERVAL = 6/59.951; |
287 | our $MIN_INTERVAL = 6/59.951; |
288 | |
288 | |
289 | { |
289 | { |
… | |
… | |
308 | |
308 | |
309 | Loads the image at the given C<$path>. The image is set to plane tiling |
309 | Loads the image at the given C<$path>. The image is set to plane tiling |
310 | mode. |
310 | mode. |
311 | |
311 | |
312 | If the image is already in memory (e.g. because another terminal instance |
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. |
313 | uses it), then the in-memory copy is returned instead. |
314 | |
314 | |
315 | =item load_uc $path |
315 | =item load_uc $path |
316 | |
316 | |
317 | Load uncached - same as load, but does not cache the image, which means it |
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 |
318 | is I<always> loaded from the filesystem again, even if another copy of it |
… | |
… | |
524 | |
524 | |
525 | Return the X and Y coordinates of the terminal window (the terminal |
525 | Return the X and Y coordinates of the terminal window (the terminal |
526 | window is the full window by default, and the character area only when in |
526 | window is the full window by default, and the character area only when in |
527 | border-respect mode). |
527 | border-respect mode). |
528 | |
528 | |
529 | Using these functions make your expression sensitive to window moves. |
529 | Using these functions makes your expression sensitive to window moves. |
530 | |
530 | |
531 | These functions are mainly useful to align images to the root window. |
531 | These functions are mainly useful to align images to the root window. |
532 | |
532 | |
533 | Example: load an image and align it so it looks as if anchored to the |
533 | Example: load an image and align it so it looks as if anchored to the |
534 | background (that's exactly what C<rootalign> does btw.): |
534 | background (that's exactly what C<rootalign> does btw.): |
535 | |
535 | |
536 | move -TX, -TY, keep { load "mybg.png" } |
536 | move -TX, -TY, keep { load "mybg.png" } |
537 | |
537 | |
538 | =item TW |
538 | =item TW |
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539 | |
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540 | =item TH |
539 | |
541 | |
540 | Return the width (C<TW>) and height (C<TH>) of the terminal window (the |
542 | Return the width (C<TW>) and height (C<TH>) of the terminal window (the |
541 | terminal window is the full window by default, and the character area only |
543 | terminal window is the full window by default, and the character area only |
542 | when in border-respect mode). |
544 | when in border-respect mode). |
543 | |
545 | |
544 | Using these functions make your expression sensitive to window resizes. |
546 | Using these functions makes your expression sensitive to window resizes. |
545 | |
547 | |
546 | These functions are mainly useful to scale images, or to clip images to |
548 | These functions are mainly useful to scale images, or to clip images to |
547 | the window size to conserve memory. |
549 | the window size to conserve memory. |
548 | |
550 | |
549 | Example: take the screen background, clip it to the window size, blur it a |
551 | Example: take the screen background, clip it to the window size, blur it a |
550 | bit, align it to the window position and use it as background. |
552 | bit, align it to the window position and use it as background. |
551 | |
553 | |
552 | clip move -TX, -TY, keep { blur 5, root } |
554 | clip move -TX, -TY, keep { blur 5, root } |
553 | |
555 | |
554 | =cut |
556 | =item FOCUS |
555 | |
557 | |
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558 | Returns a boolean indicating whether the terminal window has keyboard |
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559 | focus, in which case it returns true. |
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560 | |
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561 | Using this function makes your expression sensitive to focus changes. |
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562 | |
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563 | A common use case is to fade the background image when the terminal loses |
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564 | focus, often together with the C<-fade> command line option. In fact, |
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565 | there is a special function for just that use case: C<focus_fade>. |
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566 | |
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567 | Example: use two entirely different background images, depending on |
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568 | whether the window has focus. |
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569 | |
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570 | FOCUS ? keep { load "has_focus.jpg" } : keep { load "no_focus.jpg" } |
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571 | |
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572 | =cut |
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573 | |
556 | sub TX() { $frame->[FR_AGAIN]{position} = 1; $x } |
574 | sub TX () { $frame->[FR_AGAIN]{position} = 1; $x } |
557 | sub TY() { $frame->[FR_AGAIN]{position} = 1; $y } |
575 | sub TY () { $frame->[FR_AGAIN]{position} = 1; $y } |
558 | sub TW() { $frame->[FR_AGAIN]{size} = 1; $w } |
576 | sub TW () { $frame->[FR_AGAIN]{size} = 1; $w } |
559 | sub TH() { $frame->[FR_AGAIN]{size} = 1; $h } |
577 | sub TH () { $frame->[FR_AGAIN]{size} = 1; $h } |
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578 | sub FOCUS() { $frame->[FR_AGAIN]{focus} = 1; $focus } |
560 | |
579 | |
561 | =item now |
580 | =item now |
562 | |
581 | |
563 | Returns the current time as (fractional) seconds since the epoch. |
582 | Returns the current time as (fractional) seconds since the epoch. |
564 | |
583 | |
… | |
… | |
611 | Clips an image to the given rectangle. If the rectangle is outside the |
630 | Clips an image to the given rectangle. If the rectangle is outside the |
612 | image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is |
631 | image area (e.g. when C<$x> or C<$y> are negative) or the rectangle is |
613 | larger than the image, then the tiling mode defines how the extra pixels |
632 | larger than the image, then the tiling mode defines how the extra pixels |
614 | will be filled. |
633 | will be filled. |
615 | |
634 | |
616 | If C<$x> an C<$y> are missing, then C<0> is assumed for both. |
635 | If C<$x> and C<$y> are missing, then C<0> is assumed for both. |
617 | |
636 | |
618 | If C<$width> and C<$height> are missing, then the window size will be |
637 | If C<$width> and C<$height> are missing, then the window size will be |
619 | assumed. |
638 | assumed. |
620 | |
639 | |
621 | Example: load an image, blur it, and clip it to the window size to save |
640 | Example: load an image, blur it, and clip it to the window size to save |
… | |
… | |
639 | =item scale $width_factor, $height_factor, $img |
658 | =item scale $width_factor, $height_factor, $img |
640 | |
659 | |
641 | Scales the image by the given factors in horizontal |
660 | Scales the image by the given factors in horizontal |
642 | (C<$width>) and vertical (C<$height>) direction. |
661 | (C<$width>) and vertical (C<$height>) direction. |
643 | |
662 | |
644 | If only one factor is give, it is used for both directions. |
663 | If only one factor is given, it is used for both directions. |
645 | |
664 | |
646 | If no factors are given, scales the image to the window size without |
665 | If no factors are given, scales the image to the window size without |
647 | keeping aspect. |
666 | keeping aspect. |
648 | |
667 | |
649 | =item resize $width, $height, $img |
668 | =item resize $width, $height, $img |
… | |
… | |
774 | =item rotate $center_x, $center_y, $degrees, $img |
793 | =item rotate $center_x, $center_y, $degrees, $img |
775 | |
794 | |
776 | Rotates the image clockwise by C<$degrees> degrees, around the point at |
795 | Rotates the image clockwise by C<$degrees> degrees, around the point at |
777 | C<$center_x> and C<$center_y> (specified as factor of image width/height). |
796 | C<$center_x> and C<$center_y> (specified as factor of image width/height). |
778 | |
797 | |
779 | Example: rotate the image by 90 degrees around it's center. |
798 | Example: rotate the image by 90 degrees around its center. |
780 | |
799 | |
781 | rotate 0.5, 0.5, 90, keep { load "$HOME/mybg.png" } |
800 | rotate 0.5, 0.5, 90, keep { load "$HOME/mybg.png" } |
782 | |
801 | |
783 | =cut |
802 | =cut |
784 | |
803 | |
… | |
… | |
815 | |
834 | |
816 | sub tint($$) { |
835 | sub tint($$) { |
817 | $_[1]->tint ($_[0]) |
836 | $_[1]->tint ($_[0]) |
818 | } |
837 | } |
819 | |
838 | |
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839 | =item shade $factor, $img |
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840 | |
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841 | Shade the image by the given factor. |
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842 | |
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843 | =cut |
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844 | |
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845 | sub shade($$) { |
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846 | $_[1]->shade ($_[0]) |
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847 | } |
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848 | |
820 | =item contrast $factor, $img |
849 | =item contrast $factor, $img |
821 | |
850 | |
822 | =item contrast $r, $g, $b, $img |
851 | =item contrast $r, $g, $b, $img |
823 | |
852 | |
824 | =item contrast $r, $g, $b, $a, $img |
853 | =item contrast $r, $g, $b, $a, $img |
… | |
… | |
883 | $img |
912 | $img |
884 | } |
913 | } |
885 | |
914 | |
886 | =item muladd $mul, $add, $img # EXPERIMENTAL |
915 | =item muladd $mul, $add, $img # EXPERIMENTAL |
887 | |
916 | |
888 | First multipliesthe pixels by C<$mul>, then adds C<$add>. This cna be used |
917 | First multiplies the pixels by C<$mul>, then adds C<$add>. This can be used |
889 | to implement brightness and contrast at the same time, with a wider value |
918 | to implement brightness and contrast at the same time, with a wider value |
890 | range than contrast and brightness operators. |
919 | range than contrast and brightness operators. |
891 | |
920 | |
892 | Due to numerous bugs in XRender implementations, it can also introduce a |
921 | Due to numerous bugs in XRender implementations, it can also introduce a |
893 | number of visual artifacts. |
922 | number of visual artifacts. |
… | |
… | |
918 | =cut |
947 | =cut |
919 | |
948 | |
920 | sub blur($$;$) { |
949 | sub blur($$;$) { |
921 | my $img = pop; |
950 | my $img = pop; |
922 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
951 | $img->blur ($_[0], @_ >= 2 ? $_[1] : $_[0]) |
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952 | } |
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953 | |
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954 | =item focus_fade $img |
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955 | |
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956 | =item focus_fade $factor, $img |
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957 | |
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958 | =item focus_fade $factor, $color, $img |
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959 | |
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960 | Fades the image by the given factor (and colour) when focus is lost (the |
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961 | same as the C<-fade>/C<-fadecolor> command line options, which also supply |
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962 | the default values for C<factor> and C<$color>. Unlike with C<-fade>, the |
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963 | C<$factor> is a real value, not a percentage value (that is, 0..1, not |
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964 | 0..100). |
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965 | |
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966 | Example: do the right thing when focus fading is requested. |
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967 | |
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968 | focus_fade load "mybg.jpg"; |
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969 | |
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970 | =cut |
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971 | |
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972 | sub focus_fade($;$$) { |
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973 | my $img = pop; |
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974 | |
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975 | return $img |
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976 | if FOCUS; |
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977 | |
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978 | my $fade = @_ >= 1 ? $_[0] : defined $self->resource ("fade") ? $self->resource ("fade") * 0.01 : 0; |
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979 | my $color = @_ >= 2 ? $_[1] : $self->resource ("color+" . urxvt::Color_fade); |
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980 | |
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981 | $img = $img->tint ($color) if $color ne "rgb:00/00/00"; |
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982 | $img = $img->muladd (1 - $fade, 0) if $fade; |
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983 | |
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984 | $img |
923 | } |
985 | } |
924 | |
986 | |
925 | =back |
987 | =back |
926 | |
988 | |
927 | =head2 OTHER STUFF |
989 | =head2 OTHER STUFF |
… | |
… | |
1066 | if ($again->{rootpmap}) { |
1128 | if ($again->{rootpmap}) { |
1067 | $state->{rootpmap} = $self->on (rootpmap_change => $cb); |
1129 | $state->{rootpmap} = $self->on (rootpmap_change => $cb); |
1068 | } else { |
1130 | } else { |
1069 | delete $state->{rootpmap}; |
1131 | delete $state->{rootpmap}; |
1070 | } |
1132 | } |
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1133 | |
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1134 | if ($again->{focus}) { |
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1135 | $state->{focus} = $self->on (focus_in => $cb, focus_out => $cb); |
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1136 | } else { |
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1137 | delete $state->{focus}; |
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1138 | } |
1071 | } |
1139 | } |
1072 | |
1140 | |
1073 | # evaluate the current bg expression |
1141 | # evaluate the current bg expression |
1074 | sub recalculate { |
1142 | sub recalculate { |
1075 | my ($arg_self) = @_; |
1143 | my ($arg_self) = @_; |
… | |
… | |
1090 | local $self = $arg_self; |
1158 | local $self = $arg_self; |
1091 | local $HOME = $ENV{HOME}; |
1159 | local $HOME = $ENV{HOME}; |
1092 | local $frame = $self->{root}; |
1160 | local $frame = $self->{root}; |
1093 | |
1161 | |
1094 | ($x, $y, $w, $h) = $self->background_geometry ($self->{border}); |
1162 | ($x, $y, $w, $h) = $self->background_geometry ($self->{border}); |
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1163 | $focus = $self->focus; |
1095 | |
1164 | |
1096 | # evaluate user expression |
1165 | # evaluate user expression |
1097 | |
1166 | |
1098 | my @img = eval { $self->{expr}->() }; |
1167 | my @img = eval { $self->{expr}->() }; |
1099 | die $@ if $@; |
1168 | die $@ if $@; |