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dpavlin |
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package Frey::Web::CombineImages; |
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use Moose::Role; |
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with 'Frey::Path'; |
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with 'Frey::Storage'; |
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use GD; |
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use Digest::MD5 qw/md5_hex/; |
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use File::Slurp; |
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use Data::Dump qw/dump/; |
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=head2 combine_images |
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Combine images into CSS sprites based on L<http://www.alistapart.com/articles/sprites/> |
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my ( $combined_path, $styles ) = $self->combine_images( @paths ); |
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=cut |
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sub combine_images { |
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my $self = shift; |
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my @images = @_; |
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my $path = 'var/combine/' . md5_hex( join(' ',@images ) ); |
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my $style_path = $path . '.yaml'; |
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$path .= '.png'; |
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return ( $path, $self->load( $style_path ) ) if -e $path; |
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warn "# path $path"; |
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$self->mkbasepath( $path ); |
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# fixed dimensions of images combined |
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my ( $w, $h ) = ( 16, 16 ); |
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my $padding = 5; # space between pictures when used within text |
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my $num_images = $#images + 1; |
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my $combined = GD::Image->new( $w, $num_images * $h ) |
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|| die "can't create $w x ",$num_images * ($h + $padding)," combined image"; |
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$combined->trueColor( 1 ); |
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$combined->saveAlpha( 1 ); |
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my $white = $combined->colorAllocate(255,255,255); |
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$combined->transparent($white); |
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my $y = 0; |
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my $style; |
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foreach my $image_path ( @images ) { |
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my $i = GD::Image->new( $image_path ) || die "can't open $image_path: $!"; |
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my $i_white = $i->colorAllocate(255,255,255); |
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$i->transparent( $i_white ); |
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$i->saveAlpha( 1 ); |
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$i->trueColor( 1 ); |
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die "with not $w" unless $i->width == $w; |
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die "with not $h" unless $i->height == $h; |
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warn "# copy $image_path 0 x $y"; |
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$combined->copy( $i, 0, $y, 0, 0, $w, $h ); |
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$style->{$image_path} |
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= qq|<span style="| |
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. qq|background:url(/$path) no-repeat; | |
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. qq|background-position: 0px | . -$y . qq|px; | |
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. qq|padding: 0 0 0 | . ( $w + 3 ) . qq|px; | |
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. qq|width: ${w}px; height: ${h}px; | |
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. qq|"></span>|; |
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; |
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$y += $h + $padding; |
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} |
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write_file( $path, $combined->png ); |
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$self->store( $style_path, $style ); |
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warn |
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"# combined $num_images into ", |
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$combined->width, "x", $combined->height, " pixels ", |
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$path, " ", -s $path , " bytes ", |
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" style $style_path ", -s $style_path, " bytes"; |
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return ( $path, $style ); |
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} |
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