NAME

       PDF::Builder::Util - utility package for often-used methods across the package.

   PREDEFINED COLORS
       See the source of PDF::Builder::Resource::Colors for a complete list.

       Please Note: This is an amalgamation of the X11, SGML and (X)HTML specification sets.

       There are many color model conversion and input conversion routines defined here.

   STREAM FILTERS
       There are a number of functions here to handle stream filtering.

   PREDEFINED GLYPH-NAMES
       See the file "uniglyph.txt" for a complete list.

       Please Note: You may notice that apart from the 'AGL/WGL4', names from the XML, (X)HTML
       and SGML specification sets have been included to enable interoperability towards PDF.

       There are a number of functions here to handle various aspects of glyph identification.

   PREDEFINED PAPER SIZES
       Dimensions are in points.

       @box_corners = paper_size($x1,$y1, $x2,$y2);
           Returns an array ($x1,$y1, $x2,$y2) (full bounding box).

       @box_corners = paper_size($x1,$y1);
           Returns an array (0,0, $x1,$y1) (half bounding box).

       @box_corners = paper_size($media_name);
           Returns an array (0,0, paper_width,paper_height) for the named media.

       @box_corners = paper_size($x1);
           Returns an array (0,0, $x1,$x1) (single quadratic).

           Otherwise, array (0,0, 612,792) (US Letter dimensions) is returned.

       %sizes = getPaperSizes();
           Returns a hash containing the available paper size aliases as keys and their
           dimensions as a two-element array reference.

           See the source of PDF::Builder::Resource::PaperSizes for the complete list.

   STRING TO DIMENSION
       Convert a string "number [unit]" to the value in desired units. Units are case-insensitive
       (the input is first folded to lower case).

       Supported units: mm, cm, in (inch), pt (Big point, 72/inch), ppt (printer's point,
       72.27/inch), pc (pica, 6/inch), dd (Didot point, 67.5532/inch), and cc (Ciceros,
       5.62943/inch). More can be added easily.  Invalid units are a fatal error.

       $value = str2dim($string, $type, $default_units);
           $string contains a number and optionally, a unit. Space(s) between the number and the
           unit are optional. E.g., '200', '35.2 mm', and '1.5in' are all allowable input
           strings.

           $type is for validation of the input $string's numeric value. The first character is i
           for an integer is required (no decimal point), or f for other (floating point)
           numbers. Next is an optional c to indicate that an out-of-range input value is to be
           silently clamped to be within the given range (the default is to raise a fatal error).
           Finally, an optional range expression: {lower limit,upper limit}. The limits are
           either numbers or * (to indicate +/- infinity (no limit) on that end of the range). {
           is [ to say that the lower limit is included in the range, while ( says that the lower
           limit is excluded from the range. Likewise, } is ] for included upper limit, and ) for
           excluded. The limits (and silent clamping, or fatal error if the input is out of
           range) are against the input value, before conversion to the output units.

           Example types:

           'f(*,*)'  no limits (the default) -- all values OK
           'i(0,*)'  integer greater than 0
           'fc[-3.2,7.86]'  a number between -3.2 and 7.86, with value clamped to be within that
           range (including the endpoints)

           $default_units is a required string, giving the units that the input is converted to.
           For example, if the default units are 'pt', and the input string '2 in', the output
           value would be '144'. If the input string has no explicit units, it is assumed to be
           in the default units (no conversion is done).