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[Gzz-commits] manuscripts/AniFont anifont.tex
From: |
Janne V. Kujala |
Subject: |
[Gzz-commits] manuscripts/AniFont anifont.tex |
Date: |
Thu, 02 Oct 2003 09:53:27 -0400 |
CVSROOT: /cvsroot/gzz
Module name: manuscripts
Branch:
Changes by: Janne V. Kujala <address@hidden> 03/10/02 09:53:27
Modified files:
AniFont : anifont.tex
Log message:
some points
CVSWeb URLs:
http://savannah.gnu.org/cgi-bin/viewcvs/gzz/manuscripts/AniFont/anifont.tex.diff?tr1=1.6&tr2=1.7&r1=text&r2=text
Patches:
Index: manuscripts/AniFont/anifont.tex
diff -u manuscripts/AniFont/anifont.tex:1.6 manuscripts/AniFont/anifont.tex:1.7
--- manuscripts/AniFont/anifont.tex:1.6 Tue Sep 30 07:23:04 2003
+++ manuscripts/AniFont/anifont.tex Thu Oct 2 09:53:27 2003
@@ -87,6 +87,13 @@
- nonlinearities - to our knowledge none yet
+- assumptions about the contents of the mipmap levels
+
+ - aniso filter might compute trilinear samples using only one level, etc.
+
+ - for analysis, the contribution of one texel could be represented
+ as the contribution of four texels on a higher mimap level as per
+ the assumption of generating the mipmap levels in the usual way
\section{Surprise: stretch-squish can yield better images in orthogonal
transformations}
@@ -147,6 +154,9 @@
NV GF FX supports that, nothing else. Others can only bias the lod so
have to use supersampling 1 or 2x2
+- benefit / cost ratio analysis: how much slower than trilinear and
+ how must faster than real supersampling -- does aniso filter provide
+ ``optimal'' quality / cost ratio?
- effect was first noticed when fitting a Letter PDF page into 2048x2048
texture:
earlier used only part of resolution, anisotropic version surprisingly
improved
@@ -162,6 +172,10 @@
can still be useful - a trick we haven't seen used elsewhere
- compared various filters for text
+
+- we use aniso filter not because of optimality for the task but just because
+ it is widely implemented and optimized and thus it can be used to obtain
+ a significant improvement for a moderate performance hit.
Seveeral aspects we did not touch
- [Gzz-commits] manuscripts/AniFont anifont.tex,
Janne V. Kujala <=
- [Gzz-commits] manuscripts/AniFont anifont.tex, Tuomas J. Lukka, 2003/10/14
- [Gzz-commits] manuscripts/AniFont anifont.tex, Janne V. Kujala, 2003/10/14
- [Gzz-commits] manuscripts/AniFont anifont.tex, Tuomas J. Lukka, 2003/10/23
- [Gzz-commits] manuscripts/AniFont anifont.tex, Tuomas J. Lukka, 2003/10/23
- [Gzz-commits] manuscripts/AniFont anifont.tex, Janne V. Kujala, 2003/10/31
- [Gzz-commits] manuscripts/AniFont anifont.tex, Janne V. Kujala, 2003/10/31