Adobe Type 1及Type1 CFF字体在PDF中需遵循何种填充规则？

Great question! Let's break this down clearly based on the PDF 32000-1:2008 standard:

• Yes, Adobe Type1 and Type1 CFF (Compact Font Format) fonts do use the Non-Zero Winding Number (NZW) rule for glyph path filling, matching the behavior of TrueType and OpenType CFF2 fonts you already noted.

Looking at section 9.6.2.1 (page 254) of the spec, Type1 and Type1 CFF fonts inherit their glyph outline conventions from PostScript, which relies on the NZW rule as its native path-filling method. When PDF renders these font glyphs, it honors the inherent rule built into the font format—there’s no deviation here from the NZW behavior specified for other font types.

A quick clarification: while PDF content streams let you choose between NZW or Even-Odd (EO) for generic path drawing, font glyphs are governed by their own format’s rules. For all the font categories you mentioned (Type1, Type1 CFF, TrueType, OpenType CFF2), that rule is consistently NZW.

内容的提问来源于stack exchange，提问作者Céline