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#!/usr/bin/perl -w |
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# pdf2tiles.pl |
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# |
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# 02/24/08 01:22:36 CET Dobrica Pavlinusic <dpavlin@rot13.org> |
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use strict; |
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use Imager; |
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use File::Path; |
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use Data::Dump qw/dump/; |
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my $pdf = shift @ARGV || die "usage: $0 filename.pdf"; |
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my $debug = 0; |
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my $from_page = 1; |
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my $to_page = 2; |
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my $total_pages = $to_page - $from_page + 1; |
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my $margin_px = 3; |
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my $back_color = Imager::Color->new(255, 255, 240); |
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my $tiles_path = 'tiles/basic'; |
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|
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foreach my $path ( $tiles_path, 'ppm' ) { |
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rmtree $path if -d $path; |
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mkpath $path || die "can't create $path: $!"; |
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} |
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|
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print "redering test 100dpi page to get pixel size\n"; |
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system("pdftoppm -f 1 -l 1 -r 100 $pdf ppm/test") == 0 or die "can't render test: $?"; |
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my $test = 'ppm/test-000001.ppm'; |
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open(my $fh, '<', $test) || die "can't open $test: $!"; |
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my $res = <$fh>; |
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$res = <$fh>; |
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my ( $x_res, $y_res ) = split(/\s+/,$res); |
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print "## 100 dpi resolution = $x_res*$y_res\n"; |
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close($fh); |
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$x_res *= $total_pages; |
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$x_res += $total_pages * $margin_px; |
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print "## total size = $x_res*$y_res\n"; |
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# initial = 2*1 tiles |
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my $curr_w = 256 * 2; |
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my $curr_h = 256; |
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|
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my $x_dpi = int( 100 / ( $x_res / $curr_w ) ) - 1; # 1 dpi margins |
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my $y_dpi = int( 100 / ( $y_res / $curr_h ) ); |
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my $start_dpi = $x_dpi < $y_dpi ? $x_dpi : $y_dpi; |
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foreach my $zoom ( 1 .. 10 ) { |
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my $dpi = $start_dpi * $zoom; |
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my $ppm = sprintf("ppm/%03d", $dpi); |
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print "rendering pdf $pdf pages $from_page-$to_page in $dpi dpi\n"; |
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my $cmd = "pdftoppm -f $from_page -l $to_page -r $dpi -aa yes -aaVector yes $pdf $ppm"; |
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system($cmd) == 0 or die "can't start $cmd: $?"; |
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my @page_imgs; |
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|
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# size of all pages |
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my ( $x_size, $y_size ) = (0,0); |
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foreach my $page ( $from_page .. $to_page ) { |
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my $tmp = sprintf("ppm/%03d-%06d.ppm", $dpi, $page); |
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die "can't find page $tmp" unless -f $tmp; |
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my $p_img = Imager->new; |
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$p_img->read(file=>$tmp) or die "Can't load $tmp: ", $p_img->errstr; |
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$x_size += $p_img->getwidth() + $margin_px; |
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my $h = $p_img->getheight(); |
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$y_size = $h if $h > $y_size; |
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push @page_imgs, $p_img; |
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} |
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if ( $x_size > $curr_w ) { |
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print "WARNING: calculated size with margins $x_size > $curr_w\n"; |
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$x_size = $curr_w; |
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} |
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print "loaded $from_page-$to_page of $x_size*$y_size pixels\n"; |
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sub pad { |
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my $s = shift; |
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my $l = $s % 256; |
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return $l ? 256 - $l : 0; |
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} |
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my ( $full_x, $full_y ) = ( $x_size + pad( $x_size ), $y_size + pad( $y_size ) ); |
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my $img = Imager->new( xsize => $full_x, ysize => $full_y ); |
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$img->box(filled=>1, color=>$back_color); |
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my $x_pos = int( pad( $x_size ) / 2 ); |
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my $y_pos = int( pad( $y_size ) / 2 ); |
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foreach my $page_img ( @page_imgs ) { |
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$img->paste( left => $x_pos, top => $y_pos, img => $page_img ); |
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$x_pos += $page_img->getwidth() + $margin_px; |
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} |
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undef @page_imgs; |
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$img->write( file => sprintf("zoom-%03d.jpg", $dpi ) ) if $debug; |
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my $tiles_x = int( $x_size / 256 ); |
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my $tiles_y = int( $y_size / 256 ); |
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my $tx_offset = int( ( $curr_w - $x_size ) / ( 2 * 256 ) ); |
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my $ty_offset = int( ( $curr_h - $y_size ) / ( 2 * 256 ) ); |
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print "creating in $tiles_x*$tiles_y tiles from $full_x*$full_y\n"; |
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for my $y ( 0 .. $tiles_y ) { |
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for my $x ( 0 .. $tiles_x ) { |
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my $size = { |
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left => $x * 256, |
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bottom => $full_y - $y * 256, |
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width => 256, |
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height => 256, |
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}; |
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my $tile = $img->crop( %$size ) or die "can't crop $x*$y ",dump( $size ); |
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my $tx = $x + $tx_offset; |
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my $ty = $y + $ty_offset; |
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# emulate TileCache disk layout |
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my $path = sprintf("%s/%02d/%03d/%03d/%03d/%03d/%03d/%03d.png", |
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$tiles_path, |
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$zoom - 1, # starts with 0 |
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int( $tx / 1000000 ), |
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int( $tx / 1000 ) % 1000, |
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$tx % 1000, |
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int( $ty / 1000000 ), |
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int( $ty / 1000 ) % 1000, |
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$ty % 1000 |
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); |
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my $dir = $path; |
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$dir =~ s,/[^/]+$,,; |
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mkpath $dir unless -d $dir; |
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$tile->write( file => $path ) or die $tile->errstr; |
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undef $tile; |
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printf("# %2dx%-2d => %2dx%-2d %s\n", $x, $y, $tx, $ty, $path); |
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} |
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} |
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# break if zoom level over 300dpi |
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last if $dpi > 300; |
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# increase virtual size twice |
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$curr_w += $curr_w; |
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$curr_h += $curr_h; |
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} |
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