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dpavlin |
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package TermEncoder; |
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use strict; |
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use Time::HiRes qw/ time /; |
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sub new { |
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my ($class, %args) = @_; |
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my $self = bless {}, $class; |
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die unless exists $args{'term'}; |
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$self->{'term'} = delete $args{'term'}; |
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$self->{'frames'} = 0; |
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$self->{'buffers'} = { |
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d => ['as_string'], |
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f => ['fg_as_string'], |
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b => ['bg_as_string'], |
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B => ['bold_as_string'], |
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U => ['underline_as_string'], |
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}; |
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return $self; |
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} |
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sub is_dirty { |
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my ($self) = @_; |
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return 1 if $self->{'frames'} == 0; |
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for my $bufk ( keys %{$self->{'buffers'}} ) { |
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my $buf = $self->{'buffers'}->{$bufk}; |
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my $fn = $buf->[0]; |
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return 1 if $buf->[1] ne $self->{'term'}->$fn; |
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} |
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return 0; |
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} |
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sub next_pframe { |
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my ($self, $time) = @_; |
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$time = time unless defined $time; |
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return $self->next_iframe($time) if $self->{'frames'} == 0; |
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my $fs = { t => $time+0, x => $self->{'term'}->curposx+0, y => $self->{'term'}->curposy+0 }; |
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for my $bufk ( keys %{$self->{'buffers'}} ) { |
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my $buf = $self->{'buffers'}->{$bufk}; |
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my $fn = $buf->[0]; |
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my $new = $self->{'term'}->$fn; |
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$fs->{$bufk} = $self->_compress_pframe_block( $buf->[1], $new ) |
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if $buf->[1] ne $new; |
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$buf->[1] = $new; |
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} |
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$self->{'frames'}++; |
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return $fs; |
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} |
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sub next_iframe { |
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my ($self, $time) = @_; |
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$time = time unless defined $time; |
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my $fs = { t => $time+0, i => 1, x => $self->{'term'}->curposx+0, y => $self->{'term'}->curposy+0 }; |
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for my $bufk ( keys %{$self->{'buffers'}} ) { |
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my $buf = $self->{'buffers'}->{$bufk}; |
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my $fn = $buf->[0]; |
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my $info = $self->{'term'}->$fn; |
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$fs->{$bufk} = $self->_compress_iframe_block( $info ); |
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$buf->[1] = $info; |
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} |
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$self->{'frames'}++; |
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return $fs; |
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} |
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sub _compress_iframe_block { |
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my ($self, $block) = @_; |
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my @out = (); |
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my @rows = split /\n/, $block; |
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my $lastrow = undef; |
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for my $r ( @rows ) { |
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if ( defined $lastrow and $lastrow eq $r ) { |
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push @out, 'd'; # duplicate last row |
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} else { |
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if ( (substr($r,0,1) x length($r)) eq $r ) { |
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push @out, ['a', substr($r,0,1)]; # one-char line |
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} else { |
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push @out, ['r', $r]; # raw line |
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} |
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# TODO: RLE line |
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} |
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$lastrow = $r; |
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} |
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return \@out; |
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} |
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sub _compress_pframe_block { |
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my ($self, $old, $new) = @_; |
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my @old = split /\n/, $old; |
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my @new = split /\n/, $new; |
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die if @old != @new; |
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my @diff; |
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MAINROW: for my $row ( 0 .. $#old ) { NEXTER: { |
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if ( $new[$row] ne $old[$row] ) { |
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for my $other ( 0 .. $#old ) { |
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if ( $new[$row] eq $old[$other] ) { |
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# row copy mode |
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push @diff, ['cp', $other+0, $row+0]; |
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last NEXTER; |
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} |
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} |
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if ( substr($new[$row],0,1) x length($new[$row]) eq $new[$row] ) { |
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# one char line mode |
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push @diff, [$row+0, ['a', substr($new[$row],0,1).""]]; |
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last NEXTER; |
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} |
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my @off = map { substr($old[$row], $_, 1) ne substr($new[$row], $_, 1) } 0 .. length($old[$row])-1; |
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my @offchunks = (); |
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for my $i ( 0 .. $#off ) { |
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if ( $off[$i] ) { |
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if ( @offchunks and $offchunks[-1][1] >= $i-4 ) { # coalesce if there's less than 3 chars between |
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$offchunks[-1][1] = $i; |
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} else { |
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push @offchunks, [$i,$i]; |
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} |
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} |
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} |
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for my $ch ( @offchunks ) { |
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if ( $ch->[0] == $ch->[1] ) { |
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# char mode |
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push @diff, [$row+0, $ch->[0]+0, substr($new[$row], $ch->[0], 1).""]; |
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} else { |
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my $chunk = substr($new[$row], $ch->[0], $ch->[1]-$ch->[0]+1); |
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if ( substr($chunk,0,1) x length($chunk) eq $chunk ) { |
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# one char chunk mode |
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push @diff, [$row+0, $ch->[0]+0, $ch->[1]+0, ['a',substr($chunk,0,1).""]]; |
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} else { |
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# chunk mode |
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push @diff, [$row+0, $ch->[0]+0, $ch->[1]+0, $chunk.""]; |
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} |
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} |
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} |
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} |
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} # NEXTER |
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$old[$row] = $new[$row]; |
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} |
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return \@diff; |
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} |
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sub frames { $_[0]->{'frames'} } |
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1; |
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