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Add some information on fonts, paragraph stylings etc. (Holds the latest

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knowledge as encapsulated in StyleTextPropAtom.java)


git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@353761 13f79535-47bb-0310-9956-ffa450edef68
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Nick Burch 2005-08-07 15:04:46 +00:00
parent 255fdf3d72
commit 4e01b6989f
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src/documentation/content/xdocs/hslf/ppt-file-format.xml
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@ -175,6 +175,101 @@ BE15 0000 5566 Sheet (1+4)=5 starts at offset 5566
0900 1000 1048585 Count is 1 (12 highest bits)
Starting number is 9 (20 lowest bits)
4418 0000 6212 Sheet (9+0)=9 starts at offset 9212
</source>
</section>
<section><title>Paragraph and Text Styling</title>
<p>
There are quite a number of records that affect the styling
of text, and a smaller number that are responsible for the
styling of paragraphs.
</p>
<p>
By default, a given set of text will inherit paragraph and text
stylings from the appropriate master sheet. If anything differs
from the master sheet, then appropriate styling records will
follow the text record.
</p>
<p>
<em>(We don't currently know enough about master sheet styling
to write about it)</em>
</p>
<p>
Normally, powerpoint will have one text record (TextBytesAtom
or TextCharsAtom) for every paragraph, with a preceeding
TextHeaderAtom to describe what sort of paragraph it is.
If any of the stylings differ from the master's, then a
StyleTextPropAtom will follow the text record. This contains
the paragraph style information, and the styling information
for each section of the text which has a different style.
(More on StyleTextPropAtom later)
</p>
<p>
For every font used, a FontEntityAtom must exist for that font.
The FontEntityAtoms live inside a FontCollection record, and
there's one of those inside Environment record inside the
Document record. <em>(More on Fonts to be discovered)</em>
</p>
</section>
<section><title>StyleTextPropAtom</title>
<p>
If the text or paragraph stylings for a given text record
differ from those of the appropriate master, then there will
be one of these records.
</p>
<p>
Firstly, this contains the number of characters it applies to,
stored in a 2 byte little endian number.
Normally, this will be the same as the number of characters
in the text record. Then there are two values which encode
paragraph properties (alignment, text spacing etc), both 4
byte little endian numbers.
</p>
<p>
Following this is one block of information for each subsequent
bit of text with a different styling. (If your text was
10 characters in blue, then 10 in red, you would have two blocks).
Firstly is the number of characters it applies to, or 0 if it
applies to all remaining text. (This is a 2 byte little endian
number). Then there is a number (4 byte little endian) that
encodes if the text is bold/italic/underlined. If that number
was non zero, it is followed by another 4 byte number, that
encodes further text styling information. If it was zero,
then it's followed by a 2 byte number.
</p>
<p>
In the character styling block, the first number after the
character count indicated the bold/italic/underlined status
of the text. If you binary AND it with 0x00010000 (65536) and
get that value back, it is in bold. If you binary AND it with
0x00020000 (131072) and get that value back, it is in italic.
If you binary AND it with 0x00040000 (262144) and get that
value back, it is underlined.
</p>
<source>
hex on disk decimal description
----------- ------- -----------
0000 0 No options
A10F 4001 Record type is 4001
2E00 0000 46 Length of data is 46 bytes
5300 83 The paragraph stylings apply to 83 characters
0000 0000 0 Paragraph stylings 1 - as per the master
0000 0000 0 Paragraph stylings 2 - as per the master
1E00 30 These character properties apply to 30 characters
0000 0100 65536 Bold
0000 0100 65536 ??
1C00 28 These character properties apply to 28 characters
0000 0200 131072 Italic
0400 0200 131076 ??
0000 0 These character properties apply to the remaining characters
0005 1900 1639680 Bold
0000 0000 0 ??
0400 4 ??
FF33 13311 ??
00FE 65024 ??
</source>
</section>
</body>