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           SECTION 5.5                                                                 Simple Fonts



           PDF consumer application prints to a PostScript output device. This applies par-
           ticularly to the operands of the d0 and d1 operators, which in PostScript are
           named setcharwidth and setcachedevice. For further explanation, see Section 5.7
           of the PostScript Language Reference, Third Edition.

                                   TABLE 5.10 Type 3 font operators
OPERANDS                OPERATOR    DESCRIPTION

wx w y                  d0          Set width information for the glyph and declare that the glyph descrip-
                                    tion specifies both its shape and its color. (Note that this operator name
                                    ends in the digit 0.) wx specifies the horizontal displacement in the glyph
                                    coordinate system; it must be consistent with the corresponding width
                                    in the font’s Widths array. wy must be 0 (see Section 5.1.3, “Glyph Posi-
                                    tioning and Metrics”).
                                    This operator is permitted only in a content stream appearing in a
                                    Type 3 font’s CharProcs dictionary. It is typically used only if the glyph
                                    description executes operators to set the color explicitly.

wx wy llx lly urx ury   d1          Set width and bounding box information for the glyph and declare that
                                    the glyph description specifies only shape, not color. (Note that this
                                    operator name ends in the digit 1.) wx specifies the horizontal displace-
                                    ment in the glyph coordinate system; it must be consistent with the
                                    corresponding width in the font’s Widths array. wy must be 0 (see Section
                                    5.1.3, “Glyph Positioning and Metrics”).
                                    llx and lly are the coordinates of the lower-left corner, and urx and ury the
                                    upper-right corner, of the glyph bounding box. The glyph bounding box
                                    is the smallest rectangle, oriented with the axes of the glyph coordinate
                                    system, that completely encloses all marks placed on the page as a result
                                    of executing the glyph’s description. The declared bounding box must be
                                    correct—in other words, sufficiently large to enclose the entire glyph. If
                                    any marks fall outside this bounding box, the result is unpredictable.
                                    A glyph description that begins with the d1 operator should not execute
                                    any operators that set the color (or other color-related parameters) in the
                                    graphics state; any use of such operators is ignored. The glyph descrip-
                                    tion is executed solely to determine the glyph’s shape. Its color is deter-
                                    mined by the graphics state in effect each time this glyph is painted by a
                                    text-showing operator. For the same reason, the glyph description may
                                    not include an image; however, an image mask is acceptable, since it
                                    merely defines a region of the page to be painted with the current color.
                                    This operator is permitted only in a content stream appearing in a
                                    Type 3 font’s CharProcs dictionary.

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