freetype-devel
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Overlap oversampling


From: Alexei Podtelezhnikov
Subject: Re: Overlap oversampling
Date: Mon, 22 Jun 2020 23:41:53 -0400

Hi again,

The oversampling is implemented though inflating the outline and then
averaging the increased number of cells using FT_RASTER_FLAG_DIRECT
mechanism. The first two patches set the stage by splitting the code
paths for LCD rendering out of the way and trying
FT_RASTER_FLAG_DIRECT for FT_RENDER_MODE_LCD. The third one implements
oversampling by replacing the normal rendering with oversampling if
SCALE is 2 or 4 (as opposed to 1). Again the proposal is to have it as
FT_RENDER_MODE_SLOW eventually. The slightly complicated averaging of
cells is due to 255/4+255/4+255/4+255/4 = 252 instead of 255, so we
have to do rounding, yet avoid overflowing.

Comments?

Alexei

Attachment: 0002-DIRECT.patch
Description: Binary data

Attachment: 0001-SPLIT.patch
Description: Binary data

Attachment: 0003-SLOW.patch
Description: Binary data


reply via email to

[Prev in Thread] Current Thread [Next in Thread]