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#! perl |
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|
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#:META:X_RESOURCE:%.expr:string:background expression |
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#:META:X_RESOURCE:%.enable:boolean:some boolean |
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#:META:X_RESOURCE:%.extra.*:value:extra config |
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|
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our $EXPR = 'move load "/root/pix/das_fette_schwein.jpg", repeat_wrap, X, Y'; |
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$EXPR = ' |
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rotate W, H, 50, 50, counter 1/59.95, repeat_mirror, |
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clip X, Y, W, H, repeat_mirror, |
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load "/root/pix/das_fette_schwein.jpg" |
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'; |
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$EXPR = 'solid "red"'; |
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#$EXPR = 'blur root, 10, 10' |
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#$EXPR = 'blur move (root, -x, -y), 5, 5' |
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#resize load "/root/pix/das_fette_schwein.jpg", w, h |
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|
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use Safe; |
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|
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our ($bgdsl_self, $old, $new); |
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our ($l, $t, $w, $h); |
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|
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# enforce at least this interval between updates |
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our $MIN_INTERVAL = 1/100; |
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|
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{ |
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package urxvt::bgdsl; # background language |
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|
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*repeat_empty = \&urxvt::RepeatNone; |
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*repeat_tile = \&urxvt::RepeatNormal; |
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*repeat_pad = \&urxvt::RepeatPad; |
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*repeat_mirror = \&urxvt::RepeatReflect; |
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|
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=head2 PROVIDERS/GENERATORS |
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|
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=over 4 |
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|
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=item load $path |
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|
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=cut |
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|
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sub load($) { |
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my ($path) = @_; |
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|
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$new->{load}{$path} = $old->{load}{$path} || $bgdsl_self->new_img_from_file ($path); |
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} |
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|
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sub root() { |
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$new->{rootpmap_sensitive} = 1; |
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die "root op not supported, exg, we need you"; |
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} |
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|
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sub solid($;$$) { |
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my $img = $bgdsl_self->new_img (urxvt::PictStandardARGB32, $_[1] || 1, $_[2] || 1); |
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$img->fill ($_[0]); |
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$img |
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} |
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|
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=back |
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|
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=head2 OPERATORS |
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|
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=over 4 |
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|
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=cut |
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|
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# sub clone($) { |
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# $_[0]->clone |
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# } |
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|
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sub clip($$$$$;$) { |
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my $img = pop; |
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$img->sub_rect ($_[0], $_[1], $_[2], $_[3], $_[4]) |
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} |
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|
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sub resize($$$) { |
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my $img = pop; |
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$img->scale ($_[0], $_[1]) |
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} |
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|
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# TODO: ugly |
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sub move($$;$) { |
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my $img = pop; |
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$img->sub_rect ( |
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$_[0], $_[1], |
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$img->w, $img->h, |
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$_[2], |
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) |
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} |
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|
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sub rotate($$$$$$;$) { |
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my $img = pop; |
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$img->rotate ( |
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$_[0], |
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$_[1], |
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$_[2] * $img->w * .01, |
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$_[3] * $img->h * .01, |
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$_[4] * (3.14159265 / 180), |
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$_[5], |
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) |
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} |
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|
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sub blur($$$) { |
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my ($rh, $rv, $img) = @_; |
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|
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$img->blur ($rh, $rv); |
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} |
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|
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sub contrast($$;$$;$) { |
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my $img = pop; |
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my ($r, $g, $b, $a) = @_; |
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|
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($g, $b) = ($r, $r) if @_ < 4; |
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$a = 1 if @_ < 5; |
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|
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$img = $img->clone; |
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$img->contrast ($r, $g, $b, $a); |
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$img |
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} |
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|
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sub brightness($$;$$;$) { |
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my $img = pop; |
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my ($r, $g, $b, $a) = @_; |
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|
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($g, $b) = ($r, $r) if @_ < 4; |
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$a = 1 if @_ < 5; |
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|
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$img = $img->clone; |
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$img->brightness ($r, $g, $b, $a); |
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$img |
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} |
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|
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sub X() { $new->{position_sensitive} = 1; $l } |
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sub Y() { $new->{position_sensitive} = 1; $t } |
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sub W() { $new->{size_sensitive} = 1; $w } |
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sub H() { $new->{size_sensitive} = 1; $h } |
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|
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sub now() { urxvt::NOW } |
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|
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sub again($) { |
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$new->{again} = $_[0]; |
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} |
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|
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sub counter($) { |
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$new->{again} = $_[0]; |
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$bgdsl_self->{counter} + 0 |
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} |
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|
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=back |
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|
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=cut |
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|
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} |
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|
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sub parse_expr { |
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my $expr = eval "sub {\npackage urxvt::bgdsl;\n#line 0 'background expression'\n$_[0]\n}"; |
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die if $@; |
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$expr |
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} |
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|
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# compiles a parsed expression |
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sub set_expr { |
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my ($self, $expr) = @_; |
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|
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$self->{expr} = $expr; |
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$self->recalculate; |
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} |
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|
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# evaluate the current bg expression |
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sub recalculate { |
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my ($self) = @_; |
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|
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# rate limit evaluation |
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|
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if ($self->{next_refresh} > urxvt::NOW) { |
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$self->{next_refresh_timer} = urxvt::timer->new->after ($self->{next_refresh} - urxvt::NOW)->cb (sub { |
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$self->recalculate; |
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}); |
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return; |
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} |
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|
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$self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL; |
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|
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# set environment to evaluate user expression |
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|
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local $bgdsl_self = $self; |
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|
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local $old = $self->{state}; |
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local $new = my $state = $self->{state} = {}; |
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|
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($l, $t, $w, $h) = |
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$self->get_geometry; |
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|
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# evaluate user expression |
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|
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my $img = eval { $self->{expr}->() }; |
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warn $@ if $@;#d# |
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die if !UNIVERSAL::isa $img, "urxvt::img"; |
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|
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# if the expression is sensitive to external events, prepare reevaluation then |
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|
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my $repeat; |
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|
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if (my $again = $state->{again}) { |
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$repeat = 1; |
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$state->{timer} = $again == $old->{again} |
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? $old->{timer} |
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: urxvt::timer->new->after ($again)->interval ($again)->cb (sub { |
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++$self->{counter}; |
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$self->recalculate |
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}); |
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} |
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|
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if (delete $state->{position_sensitive}) { |
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$repeat = 1; |
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$self->enable (position_change => sub { $_[0]->recalculate }); |
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} else { |
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$self->disable ("position_change"); |
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} |
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|
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if (delete $state->{size_sensitive}) { |
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$repeat = 1; |
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$self->enable (size_change => sub { $_[0]->recalculate }); |
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} else { |
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$self->disable ("size_change"); |
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} |
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|
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if (delete $state->{rootpmap_sensitive}) { |
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$repeat = 1; |
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$self->enable (rootpmap_change => sub { $_[0]->recalculate }); |
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} else { |
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$self->disable ("rootpmap_change"); |
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} |
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|
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# clear stuff we no longer need |
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|
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%$old = (); |
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|
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unless ($repeat) { |
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delete $self->{state}; |
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delete $self->{expr}; |
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} |
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|
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# prepare and set background pixmap |
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|
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$img = $img->sub_rect (0, 0, $w, $h) |
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if $img->w != $w || $img->h != $h; |
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|
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$self->set_background ($img); |
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$self->scr_recolour (0); |
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$self->want_refresh; |
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} |
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|
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sub on_start { |
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my ($self) = @_; |
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|
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$self->set_expr (parse_expr $EXPR); |
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|
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() |
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} |
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|
