510440 - [@font-face] implement better support for CFF fonts under Windows 7

Status: RESOLVED WORKSFORME

(Core :: Graphics, defect)

Description

[John Daggett (:jtd)]

Dynamically loaded Postscript-style OpenType (CFF) fonts on Windows XP and Vista cannot be shaped with Uniscribe due to a bug in Uniscribe (so no ligatures or kerning).  Also, before Windows 7, the t2embed library only allows TTF fonts to be loaded.

Steps:

Under Windows 7, load the URL.  The example using Calluna shows neither kerning or ligatures.

Expected result: as on Mac/Linux, kerning and ligatures display.

Windows 7 fixes both these bugs so we should add code to sniff for Windows 7 and load CFF fonts via the t2embed library when possible.

Comment 1

[John Daggett (:jtd)]

Attachment: patch, v.0.1, detect Windows 7 and load CFF fonts via t2embed

Comment 2

[John Daggett (:jtd)]

Attachment: screenshot of downloadable fonts on Win XP w/o t2embed

Comment 3

[John Daggett (:jtd)]

Attachment: screenshot of downloadable fonts on Win7 w/o t2embed

Windows 7 has corrected the Uniscribe problem with loading CFF fonts via AddFontMemResourceEx (and also loading via t2embed), so kerning/ligatures show correctly for both TTF and OTF fonts.  WinXP only shows TTF fonts correctly.

Comment 4

[John Daggett (:jtd)]

Testcase for both screenshots:
http://people.mozilla.org/~jdaggett/tests/otfttfkerning.html

Comment 5

[Alex]

Would Part 3 of bug 502906 allow this to be fixed in a "nicer" way? (Instead of relying on an OS version check, it'd just try Uniscribe and fallback to GDI if it fails)

Comment 6

[[not reading bugmail]]

(In reply to comment #0)
> Windows 7 fixes both these bugs so we should add code to sniff for Windows 7

If you wanted to do OS sniffing, wouldn't using the SDK define for Windows 7+ work?

Comment 7

[John Daggett (:jtd)]

Fixed by the patch for bug 578022.