nick 2005/09/17 08:40:15
Modified: src/documentation/content/xdocs/hslf ppt-file-format.xml
Log:
Added information from Yegor on font storage
Revision Changes Path
1.5 +38 -0
jakarta-poi/src/documentation/content/xdocs/hslf/ppt-file-format.xml
Index: ppt-file-format.xml
===================================================================
RCS file:
/home/cvs/jakarta-poi/src/documentation/content/xdocs/hslf/ppt-file-format.xml,v
retrieving revision 1.4
retrieving revision 1.5
diff -u -r1.4 -r1.5
--- ppt-file-format.xml 5 Sep 2005 09:34:07 -0000 1.4
+++ ppt-file-format.xml 17 Sep 2005 15:40:15 -0000 1.5
@@ -308,5 +308,43 @@
1800 24 Font Size = 24
</source>
</section>
+
+ <section><title>Fonts in PowerPoint</title>
+ <p>
+ PowerPoint stores information about the fonts used in
FontEntityAtoms,
+ which live inside Document.Environment.FontCollection.
For every different
+ font used, a FontEntityAtom must exist for that font.
There is always at
+ least one FontEntityAtom in
Document.Environment.FontCollection,
+ which describes the default font.
+ </p>
+ </section>
+
+ <section><title>FontEntityAtom</title>
+ <p>
+ The instance field of the record header contains the
zero based index of the
+ font. Font index entries in StyleTextPropAtoms will
refer to their required
+ font via this index.
+ </p>
+ <p>
+ The length of FontEntityAtoms is always 68 bytes. The
first 64 bytes of
+ it hold the typeface name of the font to be used. This
is stored as
+ a null-terminated string, and encoded as little endian
unicode. (The
+ length of the string must not exceed 32 characters
including the null
+ termination, so the typeface name cannot exceed 31
characters).
+ </p>
+
+ <p>
+ After the typeface name there are 4 bytes of bitmask
flags. The details of these
+ can be found in the Windows API, under the LOGFONT
structure.
+ The 65th byte is the output precision, which defines
how closely the system chosen
+ font must match the requested font, in terms of heigh,
width, pitch etc.
+ The 66th byte is the clipping precision, which defines
how to clip characters
+ that occur partly outside the clipping region.
+ The 67th byte is the output quality, which defines how
closely the system
+ must match the logical font's attributes to those of
the physical font used.
+ The 68th (and final) byte is the pitch and family,
which is used by the
+ system when matching fonts.
+ </p>
+ </section>
</body>
</document>
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