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TABLE 510 Type 3 font operators
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OPERANDS OPERATOR DESCRIPTION
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wx wy
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Set width information for the glyph and declare that the glyph description speci es both its shape and its color (Note that this operator name ends in the digit 0) wx speci es 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 513, Glyph Positioning 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
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wx wy llx lly urx ury
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Set width and bounding box information for the glyph and declare that the glyph description speci es only shape, not color (Note that this operator name ends in the digit 1) wx speci es 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 513, Glyph Positioning and Metrics )
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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, suf ciently large to enclose the entire glyph If any marks fall outside this bounding box, the result is unpredictable
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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 will be ignored The glyph description is executed solely to determine the glyph s shape; its color is determined 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 de nes 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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S E CTIO N 5 5
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Simple Fonts
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Example of a Type 3 Font
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Example 59 shows the de nition of a Type 3 font with only two glyphs a lled square and a lled triangle, selected by the characters a and b Figure 512 shows the result of showing the string (ababab) using this font
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FIGURE 512 Output from Example 59 Example 59 4 0 obj << /Type /Font /Subtype /Type3 /FontBBox [0 0 750 750] /FontMatrix [0001 0 0 0001 0 0] /CharProcs 10 0 R /Encoding 9 0 R /FirstChar 97 /LastChar 98 /Widths [1000 1000] >> endobj 9 0 obj << /Type /Encoding /Differences [97 /square /triangle] >> endobj
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10 0 obj << /square 11 0 R /triangle 12 0 R >> endobj 11 0 obj << /Length 39 >> stream 1000 0 0 0 750 750 d1 0 0 750 750 re f endstream endobj 12 0 obj << /Length 48 >> stream 1000 0 0 0 750 750 d1 0 0 m 375 750 l 750 0 l f endstream endobj
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A font s encoding is the association between character codes (obtained from text strings that are shown) and glyph descriptions This section describes the character encoding scheme used with simple PDF fonts Composite fonts (Type 0) use a different character mapping algorithm, as discussed in Section 56, Composite Fonts Except for Type 3 fonts, every font program has a built-in encoding Under certain circumstances, a PDF font dictionary can change a font s built-in encoding to match the requirements of the application generating the text being shown This exibility in character encoding is valuable for two reasons:
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