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Re: Analysis of redisplay performance on Windows

From: Jason Rumney
Subject: Re: Analysis of redisplay performance on Windows
Date: Wed, 30 Jul 2008 22:51:47 +0100
User-agent: Thunderbird (Windows/20080708)

YAMAMOTO Mitsuharu wrote:

>> According to the document below, Uniscribe seems to provide some
>> mechanism to defer heavy operations such as get_frame_dc and
>> SelectObject.

Yes, that seems to work if we switch to using uniscribe for encoding
characters. Since the gdi backend is only used for bitmap fonts and
older versions of Windows, I've switched off glyph indexing there for a
similar performance improvement. It hasn't had as bad an effect as I
expected with false positives when detecting support for a character.

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