use Imager::Color;
use strict;
-use vars qw(%T1_Paths %TT_Paths %T1_Cache %TT_Cache $TT_CSize $TT_CSize $T1AA);
-
-# This class is a container
-# and works for both truetype and t1 fonts.
-
-
-# $T1AA is in there because for some reason (probably cache related) antialiasing
-# is a system wide setting in t1 lib.
-
-sub t1_set_aa_level {
- if (!defined $T1AA or $_[0] != $T1AA) {
- Imager::i_t1_set_aa($_[0]);
- $T1AA=$_[0];
+use vars qw($VERSION);
+
+$VERSION = "1.033";
+
+# the aim here is that we can:
+# - add file based types in one place: here
+# - make sure we only attempt to create types that exist
+# - give reasonable defaults
+# - give the user some control over which types get used
+my %drivers =
+ (
+ tt=>{
+ class=>'Imager::Font::Truetype',
+ module=>'Imager/Font/Truetype.pm',
+ files=>'.*\.ttf$',
+ description => 'FreeType 1.x',
+ },
+ t1=>{
+ class=>'Imager::Font::Type1',
+ module=>'Imager/Font/Type1.pm',
+ files=>'.*\.pfb$',
+ description => 'T1Lib',
+ },
+ ft2=>{
+ class=>'Imager::Font::FreeType2',
+ module=>'Imager/Font/FreeType2.pm',
+ files=>'.*\.(pfa|pfb|otf|ttf|fon|fnt|dfont|pcf(\.gz)?)$',
+ description => 'FreeType 2.x',
+ },
+ ifs=>{
+ class=>'Imager::Font::Image',
+ module=>'Imager/Font/Image.pm',
+ files=>'.*\.ifs$',
+ },
+ w32=>{
+ class=>'Imager::Font::Win32',
+ module=>'Imager/Font/Win32.pm',
+ description => 'Win32 GDI Fonts',
+ },
+ );
+
+# this currently should only contain file based types, don't add w32
+my @priority = qw(t1 tt ft2 ifs);
+
+# when Imager::Font is loaded, Imager.xs has not been bootstrapped yet
+# this function is called from Imager.pm to finish initialization
+sub __init {
+ @priority = grep Imager::i_has_format($_), @priority;
+ for my $driver_name (grep Imager::i_has_format($_), keys %drivers) {
+ $drivers{$driver_name}{enabled} = 1;
}
}
sub new {
my $class = shift;
- my $self ={};
- my ($file,$type,$id);
- my %hsh=(color=>Imager::Color->new(255,0,0,0),
- size=>15,
+ my $self = {};
+ my ($file, $type, $id);
+ my %hsh=(color => Imager::Color->new(255,0,0,0),
+ size => 15,
@_);
bless $self,$class;
- if ($hsh{'file'}) {
- $file=$hsh{'file'};
+ if ($hsh{'file'}) {
+ $file = $hsh{'file'};
if ( $file !~ m/^\// ) {
- $file='./'.$file;
+ $file = './'.$file;
if (! -e $file) {
- $Imager::ERRSTR="Font $file not found";
+ $Imager::ERRSTR = "Font $file not found";
return();
}
}
- $type=$hsh{'type'};
- if (!defined($type) or $type !~ m/^(t1|tt)/) {
- $type='tt' if $file =~ m/\.ttf$/i;
- $type='t1' if $file =~ m/\.pfb$/i;
+ $type = $hsh{'type'};
+ if (!defined($type) or !$drivers{$type} or !$drivers{$type}{enabled}) {
+ for my $drv (@priority) {
+ undef $type;
+ my $re = $drivers{$drv}{files} or next;
+ if ($file =~ /$re/i) {
+ $type = $drv;
+ last;
+ }
+ }
}
if (!defined($type)) {
- $Imager::ERRSTR="Font type not found";
+ # some types we can support, but the driver isn't available
+ # work out which drivers support it, so we can provide the user
+ # some useful information on how to get it working
+ my @not_here;
+ for my $driver_name (keys %drivers) {
+ my $driver = $drivers{$driver_name};
+ push @not_here, "$driver_name ($driver->{description})"
+ if $driver->{files} && $file =~ /$driver->{files}/i;
+ }
+ if (@not_here) {
+ $Imager::ERRSTR = "No font drivers enabled that can support this file, rebuild Imager with any of ".join(", ", @not_here)." to use this font file";
+ }
+ else {
+ $Imager::ERRSTR = "No font type found for $hsh{'file'}";
+ }
return;
}
+ } elsif ($hsh{face}) {
+ $type = "w32";
} else {
$Imager::ERRSTR="No font file specified";
return;
}
- if (!$Imager::formats{$type}) {
- $Imager::ERRSTR="`$type' not enabled";
+ if (!$Imager::formats{$type}) {
+ $Imager::ERRSTR = "`$type' not enabled";
return;
}
# here we should have the font type or be dead already.
- if ($type eq 't1') {
- $id=Imager::i_t1_new($file);
+ require $drivers{$type}{module};
+ return $drivers{$type}{class}->new(%hsh);
+}
+
+# returns first defined parameter
+sub _first {
+ for (@_) {
+ return $_ if defined $_;
}
+ return undef;
+}
- if ($type eq 'tt') {
- $id=Imager::i_tt_new($file);
+sub draw {
+ my $self = shift;
+ my %input = ('x' => 0, 'y' => 0, @_);
+ unless ($input{image}) {
+ $Imager::ERRSTR = 'No image supplied to $font->draw()';
+ return;
+ }
+ my $image = $input{image};
+ $input{string} = _first($input{string}, $input{text});
+ unless (defined $input{string}) {
+ $image->_set_error("Missing required parameter 'string'");
+ return;
+ }
+ $input{aa} = _first($input{aa}, $input{antialias}, $self->{aa}, 1);
+ # the original draw code worked this out but didn't use it
+ $input{align} = _first($input{align}, $self->{align});
+ $input{color} = _first($input{color}, $self->{color});
+ $input{color} = Imager::_color($input{'color'});
+
+ $input{size} = _first($input{size}, $self->{size});
+ unless (defined $input{size}) {
+ $image->_set_error("No font size provided");
+ return undef;
+ }
+ $input{align} = _first($input{align}, 1);
+ $input{utf8} = _first($input{utf8}, $self->{utf8}, 0);
+ $input{vlayout} = _first($input{vlayout}, $self->{vlayout}, 0);
+
+ my $result = $self->_draw(%input);
+ unless ($result) {
+ $image->_set_error($image->_error_as_msg());
}
- $self->{'aa'}=$hsh{'aa'}||'0';
- $self->{'file'}=$file;
- $self->{'id'}=$id;
- $self->{'type'}=$type;
- $self->{'size'}=$hsh{'size'};
- $self->{'color'}=$hsh{'color'};
- return $self;
+ return $result;
}
+sub align {
+ my $self = shift;
+ my %input = ( halign => 'left', valign => 'baseline',
+ 'x' => 0, 'y' => 0, @_ );
+
+ # image needs to be supplied, but can be supplied as undef
+ unless (exists $input{image}) {
+ Imager->_set_error("Missing required parameter 'image'");
+ return;
+ }
+
+ my $errors_to = $input{image} || 'Imager';
+
+ my $text = _first($input{string}, $input{text});
+ unless (defined $text) {
+ $errors_to->_set_error("Missing required parameter 'string'");
+ return;
+ }
+
+ my $size = _first($input{size}, $self->{size});
+ my $utf8 = _first($input{utf8}, 0);
+
+ my $bbox = $self->bounding_box(string=>$text, size=>$size, utf8=>$utf8);
+ my $valign = $input{valign};
+ $valign = 'baseline'
+ unless $valign && $valign =~ /^(?:top|center|bottom|baseline)$/;
+
+ my $halign = $input{halign};
+ $halign = 'start'
+ unless $halign && $halign =~ /^(?:left|start|center|end|right)$/;
+ my $x = $input{'x'};
+ my $y = $input{'y'};
+ if ($valign eq 'top') {
+ $y += $bbox->ascent;
+ }
+ elsif ($valign eq 'center') {
+ $y += $bbox->ascent - $bbox->text_height / 2;
+ }
+ elsif ($valign eq 'bottom') {
+ $y += $bbox->descent;
+ }
+ # else baseline is the default
+ if ($halign eq 'left') {
+ $x -= $bbox->start_offset;
+ }
+ elsif ($halign eq 'start') {
+ # nothing to do
+ }
+ elsif ($halign eq 'center') {
+ $x -= $bbox->start_offset + $bbox->total_width / 2;
+ }
+ elsif ($halign eq 'end') {
+ $x -= $bbox->advance_width;
+ }
+ elsif ($halign eq 'right') {
+ $x -= $bbox->advance_width - $bbox->right_bearing;
+ }
+ $x = int($x);
+ $y = int($y);
+ if ($input{image}) {
+ delete @input{qw/x y/};
+ $self->draw(%input, 'x' => $x, 'y' => $y, align=>1)
+ or return;
+ }
+
+ return ($x+$bbox->start_offset, $y-$bbox->ascent,
+ $x+$bbox->end_offset, $y-$bbox->descent+1);
+}
sub bounding_box {
my $self=shift;
my %input=@_;
- my @box;
- if (!exists $input{'string'}) { $Imager::ERRSTR='string parameter missing'; return; }
+ if (!exists $input{'string'}) {
+ $Imager::ERRSTR='string parameter missing';
+ return;
+ }
+ $input{size} ||= $self->{size};
+ $input{sizew} = _first($input{sizew}, $self->{sizew}, 0);
+ $input{utf8} = _first($input{utf8}, $self->{utf8}, 0);
+
+ my @box = $self->_bounding_box(%input);
+
+ if (wantarray) {
+ if(@box && exists $input{'x'} and exists $input{'y'}) {
+ my($gdescent, $gascent)=@box[1,3];
+ $box[1]=$input{'y'}-$gascent; # top = base - ascent (Y is down)
+ $box[3]=$input{'y'}-$gdescent; # bottom = base - descent (Y is down, descent is negative)
+ $box[0]+=$input{'x'};
+ $box[2]+=$input{'x'};
+ } elsif (@box && $input{'canon'}) {
+ $box[3]-=$box[1]; # make it cannoical (ie (0,0) - (width, height))
+ $box[2]-=$box[0];
+ }
+ return @box;
+ }
+ else {
+ require Imager::Font::BBox;
- if ($self->{type} eq 't1') {
- @box=Imager::i_t1_bbox($self->{id}, defined($input{size}) ? $input{size} :$self->{size},
- $input{string}, length($input{string}));
+ return Imager::Font::BBox->new(@box);
}
- if ($self->{type} eq 'tt') {
- @box=Imager::i_tt_bbox($self->{id}, defined($input{size}) ? $input{size} :$self->{size},
- $input{string}, length($input{string}));
+}
+
+sub dpi {
+ my $self = shift;
+
+ # I'm assuming a default of 72 dpi
+ my @old = (72, 72);
+ if (@_) {
+ $Imager::ERRSTR = "Setting dpi not implemented for this font type";
+ return;
}
- if(exists $input{'x'} and exists $input{'y'}) {
- my($gdescent, $gascent)=@box[1,3];
- $box[1]=$input{'y'}-$gascent; # top = base - ascent (Y is down)
- $box[3]=$input{'y'}-$gdescent; # bottom = base - descent (Y is down, descent is negative)
- $box[0]+=$input{'x'};
- $box[2]+=$input{'x'};
- } elsif (exists $input{'canon'}) {
- $box[3]-=$box[1]; # make it cannoical (ie (0,0) - (width, height))
- $box[2]-=$box[0];
+ return @old;
+}
+
+sub transform {
+ my $self = shift;
+
+ my %hsh = @_;
+
+ # this is split into transform() and _transform() so we can
+ # implement other tags like: degrees=>12, which would build a
+ # 12 degree rotation matrix
+ # but I'll do that later
+ unless ($hsh{matrix}) {
+ $Imager::ERRSTR = "You need to supply a matrix";
+ return;
}
- return @box;
+
+ return $self->_transform(%hsh);
}
-1;
+sub _transform {
+ $Imager::ERRSTR = "This type of font cannot be transformed";
+ return;
+}
+sub utf8 {
+ return 0;
+}
+sub priorities {
+ my $self = shift;
+ my @old = @priority;
+
+ if (@_) {
+ @priority = grep Imager::i_has_format($_), @_;
+ }
+ return @old;
+}
+
+1;
__END__
$t1font = Imager::Font->new(file => 'pathtofont.pfb');
$ttfont = Imager::Font->new(file => 'pathtofont.ttf');
+ $w32font = Imager::Font->new(face => 'Times New Roman');
$blue = Imager::Color->new("#0000FF");
$font = Imager::Font->new(file => 'pathtofont.ttf',
$pos_width,
$global_ascent,
$descent,
- $ascent) = $font->bounding_box(string=>"Foo");
-
- $logo = $font->logo(text => "Slartibartfast Enterprises",
- size => 40,
- border => 5,
- color => $green);
- # logo is proposed - doesn't exist yet
+ $ascent,
+ $advance_width,
+ $right_bearing) = $font->bounding_box(string=>"Foo");
+ my $bbox_object = $font->bounding_box(string=>"Foo");
+ # documented in Imager::Draw
$img->string(font => $font,
text => "Model-XYZ",
x => 15,
y => 40,
size => 40,
- color => $red
+ color => $red,
aa => 1);
- # Documentation in Imager.pm
-
=head1 DESCRIPTION
This module handles creating Font objects used by imager. The module
use Imager;
print "Has truetype" if $Imager::formats{tt};
print "Has t1 postscript" if $Imager::formats{t1};
-
+ print "Has Win32 fonts" if $Imager::formats{w32};
+ print "Has Freetype2" if $Imager::formats{ft2};
=over 4
This creates a font object to pass to functions that take a font argument.
$font = Imager::Font->new(file => 'denmark.ttf',
+ index => 0,
color => $blue,
size => 30,
aa => 1);
$t1font = Imager::Font->new(file => 'fruitcase', type => 't1');
$ttfont = Imager::Font->new(file => 'arglebarf', type => 'tt');
+The C<index> parameter is used to select a single face from a font
+file containing more than one face, for example, from a Macintosh font
+suitcase or a .dfont file.
+
If any of the C<color>, C<size> or C<aa> parameters are omitted when
calling C<Imager::Font->new()> the they take the following values:
-
color => Imager::Color->new(255, 0, 0, 0); # this default should be changed
size => 15
aa => 0
+ index => 0
+
+To use Win32 fonts supply the facename of the font:
+
+ $font = Imager::Font->new(face=>'Arial Bold Italic');
+
+There isn't any access to other logical font attributes, but this
+typically isn't necessary for Win32 TrueType fonts, since you can
+contruct the full name of the font as above.
+
+Other logical font attributes may be added if there is sufficient demand.
+
+Parameters:
+
+=over
+
+=item *
+
+file - name of the file to load the font from.
+
+=item *
+
+face - face name. This is used only under Win32 to create a GDI based
+font. This is ignored if the C<file> parameter is supplied.
+
+=item *
+
+type - font driver to use. Currently the permitted values for this are:
+
+=over
+
+=item *
+
+tt - Freetype 1.x driver. Supports TTF fonts.
+
+=item *
+
+t1 - T1 Lib driver. Supports Postscript Type 1 fonts. Allows for
+synthesis of underline, strikethrough and overline.
+
+=item *
+
+ft2 - Freetype 2.x driver. Supports many different font formats.
+Also supports the transform() method.
+
+=back
+
+=item *
+
+color - the default color used with this font. Default: red.
+
+=item *
+
+size - the default size used with this font. Default: 15.
+
+=item *
+
+utf8 - if non-zero then text supplied to $img->string(...) and
+$font->bounding_box(...) is assumed to be UTF 8 encoded by default.
+
+=item *
+
+align - the default value for the $img->string(...) C<align>
+parameter. Default: 1.
+
+=item *
+
+vlayout - the default value for the $img->string(...) C<vlayout>
+parameter. Default: 0.
+
+=item *
+
+aa - the default value for the $im->string(...) C<aa> parameter.
+Default: 0.
+
+=item *
+
+index - for font file containing multiple fonts this selects which
+font to use. This is useful for Macintosh DFON (.dfont) and suitcase
+font files.
+
+If you want to use a suitcase font you will need to tell Imager to use
+the FreeType 2.x driver by setting C<type> to C<'ft2'>:
+
+ my $font = Imager::Font->new(file=>$file, index => 1, type=>'ft2')
+ or die Imager->errstr;
+
+=back
+
+
=item bounding_box
+
Returns the bounding box for the specified string. Example:
- ($neg_width,
- $global_descent,
- $pos_width,
- $global_ascent,
- $descent,
- $ascent) = $font->bounding_box(string => "A Fool");
+ my ($neg_width,
+ $global_descent,
+ $pos_width,
+ $global_ascent,
+ $descent,
+ $ascent,
+ $advance_width,
+ $right_bearing) = $font->bounding_box(string => "A Fool");
+
+ my $bbox_object = $font->bounding_box(string => "A Fool");
+
+=over
+
+=item C<$neg_width>
-The C<$neg_width> is the relative start of a the string. In some
+the relative start of a the string. In some
cases this can be a negative number, in that case the first letter
stretches to the left of the starting position that is specified in
-the string method of the Imager class. <$global_descent> is the how
-far down the lowest letter of the entire font reaches below the
-baseline (this is often j). C<$pos_width> is how wide the string from
-from the starting position is. The total width of the string is
-C<$pos_width-$neg_width>. C<$descent> and C<$ascent> are the as
-<$global_descent> and <$global_ascent> except that they are only for
-the characters that appear in the string. Obviously we can stuff all
-the results into an array just as well:
+the string method of the Imager class
+
+=item C<$global_descent>
+
+how far down the lowest letter of the entire font reaches below the
+baseline (this is often j).
+
+=item C<$pos_width>
+
+how wide the string from
+the starting position is. The total width of the string is
+C<$pos_width-$neg_width>.
+
+=item C<$descent>
+
+=item C<$ascent>
+
+the same as <$global_descent> and <$global_ascent> except that they
+are only for the characters that appear in the string.
+
+=item C<$advance_width>
+
+the distance from the start point that the next string output should
+start at, this is often the same as C<$pos_width>, but can be
+different if the final character overlaps the right side of its
+character cell.
+
+=item C<$right_bearing>
+
+The distance from the right side of the final glyph to the end of the
+advance width. If the final glyph overflows the advance width this
+value is negative.
+
+=back
+
+Obviously we can stuff all the results into an array just as well:
@metrics = $font->bounding_box(string => "testing 123");
$bbox[2] - horizontal space taken by glyphs
$bbox[3] - vertical space taken by glyphs
+Returns an L<Imager::Font::BBox> object in scalar context, so you can
+avoid all those confusing indices. This has methods as named above,
+with some extra convenience methods.
+
+Parameters are:
+
+=over
+
+=item *
+
+string - the string to calculate the bounding box for. Required.
+
+=item *
+
+size - the font size to use. Default: value set in
+Imager::Font->new(), or 15.
+
+=item *
+
+sizew - the font width to use. Default to the value of the C<size>
+parameter.
+
+=item *
+
+utf8 - For drivers that support it, treat the string as UTF8 encoded.
+For versions of perl that support Unicode (5.6 and later), this will
+be enabled automatically if the 'string' parameter is already a UTF8
+string. See L<UTF8> for more information. Default: the C<utf8> value
+passed to Imager::Font->new(...) or 0.
+
+=item *
+
+x, y - offsets applied to @box[0..3] to give you a adjusted bounding
+box. Ignored in scalar context.
+=item *
+
+canon - if non-zero and the C<x>, C<y> parameters are not supplied,
+then $pos_width and $global_ascent values will returned as the width
+and height of the text instead.
+
+=back
=item string
-This is a method of the Imager class but because it's described in
-here since it belongs to the font routines. Example:
+The $img->string(...) method is now documented in
+L<Imager::Draw/string>
+
+=item align(string=>$text, size=>$size, x=>..., y=>..., valign => ..., halign=>...)
+
+Higher level text output - outputs the text aligned as specified
+around the given point (x,y).
+
+ # "Hello" centered at 100, 100 in the image.
+ my ($left, $top, $right, $bottom) =
+ $font->align(string=>"Hello",
+ x=>100, y=>100,
+ halign=>'center', valign=>'center',
+ image=>$image);
+
+Takes the same parameters as $font->draw(), and the following extra
+parameters:
+
+=over
+
+=item valign
+
+Possible values are:
+
+=over
+
+=item top
+
+Point is at the top of the text.
+
+=item bottom
+
+Point is at the bottom of the text.
+
+=item baseline
+
+Point is on the baseline of the text (default.)
+
+=item center
- $img=Imager->new();
- $img=read(file=>"test.jpg");
- $img->string(font=>$t1font,
- text=>"Model-XYZ",
- x=>0,
- y=>40,
- size=>40,
- color=>$red);
- $img->write(file=>"testout.jpg");
+Point is vertically centered within the text.
-This would put a 40 pixel high text in the top left corner of an
-image. If you measure the actuall pixels it varies since the fonts
-usually do not use their full height. It seems that the color and
-size can be specified twice. When a font is created only the actual
-font specified matters. It his however convenient to store default
-values in a font, such as color and size. If parameters are passed to
-the string function they are used instead of the defaults stored in
-the font.
+=back
+
+=item halign
+
+=over
-If string() is called with the C<channel> parameter then the color
-isn't used and the font is drawn in only one channel of the image.
-This can be quite handy to create overlays. See the examples for tips
-about this.
+=item left
-Sometimes it is necessary to know how much space a string takes before
-rendering it. The bounding_box() method described earlier can be used
-for that.
+The point is at the left of the text.
+=item start
-=item logo
+The point is at the start point of the text.
-This method doesn't exist yet but is under consideration. It would mostly
-be helpful for generating small tests and such. Its proposed interface is:
+=item center
- $img = $font->logo(string=>"Plan XYZ", color=>$blue, border=>7);
+The point is horizontally centered within the text.
-This would be nice for writing (admittedly multiline) one liners like:
+=item right
-Imager::Font->new(file=>"arial.ttf", color=>$blue, aa=>1)
- ->string(text=>"Plan XYZ", border=>5)
- ->write(file=>"xyz.png");
+The point is at the right end of the text.
+=item end
+The point is at the end point of the text.
=back
+=item image
+
+The image to draw to. Set to C<undef> to avoid drawing but still
+calculate the bounding box.
+
+=back
+
+Returns a list specifying the bounds of the drawn text.
+
+=item dpi()
+
+=item dpi(xdpi=>$xdpi, ydpi=>$ydpi)
+
+=item dpi(dpi=>$dpi)
+
+Set or retrieve the spatial resolution of the image in dots per inch.
+The default is 72 dpi.
+
+This isn't implemented for all font types yet.
+
+Possible parameters are:
+
+=over
+
+=item *
+
+xdpi, ydpi - set the horizontal and vertical resolution in dots per
+inch.
+
+=item *
+
+dpi - set both horizontal and vertical resolution to this value.
+
+=back
+
+Returns a list containing the previous xdpi, ydpi values.
+
+=item transform(matrix=>$matrix)
+
+Applies a transformation to the font, where matrix is an array ref of
+numbers representing a 2 x 3 matrix:
+
+ [ $matrix->[0], $matrix->[1], $matrix->[2],
+ $matrix->[3], $matrix->[4], $matrix->[5] ]
+
+Not all font types support transformations, these will return false.
+
+It's possible that a driver will disable hinting if you use a
+transformation, to prevent discontinuities in the transformations.
+See the end of the test script t/t38ft2font.t for an example.
+
+Currently only the ft2 (Freetype 2.x) driver supports the transform()
+method.
+
+See samples/slant_text.pl for a sample using this function.
+
+Note that the transformation is done in font co-ordinates where y
+increases as you move up, not image co-ordinates where y decreases as
+you move up.
+
+=item has_chars(string=>$text)
+
+Checks if the characters in $text are defined by the font.
+
+In a list context returns a list of true or false value corresponding
+to the characters in $text, true if the character is defined, false if
+not. In scalar context returns a string of NUL or non-NUL
+characters. Supports UTF8 where the font driver supports UTF8.
+
+Not all fonts support this method (use $font->can("has_chars") to
+check.)
+
+=over
+
+=item *
+
+string - string of characters to check for. Required. Must contain
+at least one character.
+
+=item *
+
+utf8 - For drivers that support it, treat the string as UTF8 encoded.
+For versions of perl that support Unicode (5.6 and later), this will
+be enabled automatically if the 'string' parameter is already a UTF8
+string. See L<UTF8> for more information. Default: the C<utf8> value
+passed to Imager::Font->new(...) or 0.
+
+=back
+
+=item face_name()
+
+Returns the internal name of the face. Not all font types support
+this method yet.
+
+=item glyph_names(string=>$string [, utf8=>$utf8 ][, reliable_only=>0 ] );
+
+Returns a list of glyph names for each of the characters in the
+string. If the character has no name then C<undef> is returned for
+the character.
+
+Some font files do not include glyph names, in this case Freetype 2
+will not return any names. Freetype 1 can return standard names even
+if there are no glyph names in the font.
+
+Freetype 2 has an API function that returns true only if the font has
+"reliable glyph names", unfortunately this always returns false for
+TTF fonts. This can avoid the check of this API by supplying
+C<reliable_only> as 0. The consequences of using this on an unknown
+font may be unpredictable, since the Freetype documentation doesn't
+say how those name tables are unreliable, or how FT2 handles them.
+
+Both Freetype 1.x and 2.x allow support for glyph names to not be
+included.
+
+=item draw
+
+This is used by Imager's string() method to implement drawing text.
+See L<Imager::Draw/string>.
+
+=back
+
+=head1 MULTIPLE MASTER FONTS
+
+The Freetype 2 driver supports multiple master fonts:
+
+=over
+
+=item is_mm()
+
+Test if the font is a multiple master font.
+
+=item mm_axes()
+
+Returns a list of the axes that can be changes in the font. Each
+entry is an array reference which contains:
+
+=over
+
+=item 1.
+
+Name of the axis.
+
+=item 2.
+
+minimum value for this axis.
+
+=item 3.
+
+maximum value for this axis
+
+=back
+
+=item set_mm_coords(coords=>\@values)
+
+Blends an interpolated design from the master fonts. @values must
+contain as many values as there are axes in the font.
+
+=back
+
+For example, to select the minimum value in each axis:
+
+ my @axes = $font->mm_axes;
+ my @coords = map $_->[1], @axes;
+ $font->set_mm_coords(coords=>\@coords);
+
+It's possible other drivers will support multiple master fonts in the
+future, check if your selected font object supports the is_mm() method
+using the can() method.
+
+=head1 UTF8
+
+There are 2 ways of rendering Unicode characters with Imager:
+
+=over
+
+=item *
+
+For versions of perl that support it, use perl's native UTF8 strings.
+This is the simplest method.
+
+=item *
+
+Hand build your own UTF8 encoded strings. Only recommended if your
+version of perl has no UTF8 support.
+
+=back
+
+Imager won't construct characters for you, so if want to output
+unicode character 00C3 "LATIN CAPITAL LETTER A WITH DIAERESIS", and
+your font doesn't support it, Imager will I<not> build it from 0041
+"LATIN CAPITAL LETTER A" and 0308 "COMBINING DIAERESIS".
+
+To check if a driver supports UTF8 call the utf8 method:
+
+=over
+
+=item utf8
+
+Return true if the font supports UTF8.
+
+=back
+
+=head2 Native UTF8 Support
+
+If your version of perl supports UTF8 and the driver supports UTF8,
+just use the $im->string() method, and it should do the right thing.
+
+=head2 Build your own
+
+In this case you need to build your own UTF8 encoded characters.
+
+For example:
+
+ $x = pack("C*", 0xE2, 0x80, 0x90); # character code 0x2010 HYPHEN
+
+You need to be be careful with versions of perl that have UTF8
+support, since your string may end up doubly UTF8 encoded.
+
+For example:
+
+ $x = "A\xE2\x80\x90\x41\x{2010}";
+ substr($x, -1, 0) = "";
+ # at this point $x is has the UTF8 flag set, but has 5 characters,
+ # none, of which is the constructed UTF8 character
+
+The test script t/t38ft2font.t has a small example of this after the
+comment:
+
+ # an attempt using emulation of UTF8
+
+=head1 DRIVER CONTROL
+
+If you don't supply a 'type' parameter to Imager::Font->new(), but you
+do supply a 'file' parameter, Imager will attempt to guess which font
+driver to used based on the extension of the font file.
+
+Since some formats can be handled by more than one driver, a priority
+list is used to choose which one should be used, if a given format can
+be handled by more than one driver.
+
+=over
+
+=item priorities
+
+The current priorities can be retrieved with:
+
+ @drivers = Imager::Font->priorities();
+
+You can set new priorities and save the old priorities with:
+
+ @old = Imager::Font->priorities(@drivers);
+
+=back
+
+If you supply driver names that are not currently supported, they will
+be ignored.
+
+Imager supports both T1Lib and Freetype2 for working with Type 1
+fonts, but currently only T1Lib does any caching, so by default T1Lib
+is given a higher priority. Since Imager's Freetype2 support can also
+do font transformations, you may want to give that a higher priority:
+
+ my @old = Imager::Font->priorities(qw(tt ft2 t1));
+
=head1 AUTHOR
Arnar M. Hrafnkelsson, addi@umich.edu
And a great deal of help from others - see the README for a complete
list.
+=head1 BUGS
+
+You need to modify this class to add new font types.
+
+The $pos_width member returned by the bounding_box() method has
+historically returned different values from different drivers. The
+Freetype 1.x and 2.x, and the Win32 drivers return the max of the
+advance width and the right edge of the right-most glyph. The Type 1
+driver always returns the right edge of the right-most glyph.
+
+The newer advance_width and right_bearing values allow access to any
+of the above.
+
+=head1 REVISION
+
+$Revision$
+
=head1 SEE ALSO
-Imager(3)
-http://www.eecs.umich.edu/~addi/perl/Imager/
+Imager(3), Imager::Font::FreeType2(3), Imager::Font::Type1(3),
+Imager::Font::Win32(3), Imager::Font::Truetype(3), Imager::Font::BBox(3)
+
+ http://imager.perl.org/
=cut
projects / imager.git / blobdiff