From: DRC <dcommander@users.sourceforge.net>
Date: Sat, 28 Jan 2012 06:49:22 +0000 (+0000)
Subject: Document the new scaling factors
X-Git-Tag: 1.2.90~102
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=33eca7e4f294ef501c4f21e6ced90536ab7442de;p=libjpeg-turbo

Document the new scaling factors


git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@756 632fc199-4ca6-4c93-a231-07263d6284db
---

diff --git a/README-turbo.txt b/README-turbo.txt
index 24490e3..489c344 100755
--- a/README-turbo.txt
+++ b/README-turbo.txt
@@ -303,6 +303,14 @@ Fully supported:
 -- rdjpgcom: locale awareness
 
 
+Partially supported:
+
+-- libjpeg: IDCT scaling extensions in decompressor
+   libjpeg-turbo supports IDCT scaling with scaling factors of 1/8, 1/4, 3/8,
+   1/2, 5/8, 3/4, 7/8, 9/8, 5/4, 11/8, 3/2, 13/8, 7/4, 15/8, and 2/1, but only
+   1/4 and 1/2 are SIMD-accelerated.
+
+
 Fully supported when using libjpeg v7/v8 emulation:
 
 -- libjpeg: In-memory source and destination managers
@@ -313,10 +321,6 @@ Not supported:
 -- libjpeg: DCT scaling in compressor
    cinfo.scale_num and cinfo.scale_denom are silently ignored.
 
--- libjpeg: IDCT scaling extensions in decompressor
-   libjpeg-turbo still supports IDCT scaling with scaling factors of 1/2, 1/4,
-   and 1/8 (same as libjpeg v6b.)
-
 -- libjpeg: Fancy downsampling in compressor
    cinfo.do_fancy_downsampling is silently ignored.