From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Mon, 31 Aug 2015 23:56:42 +0000 (+0200)
Subject: Fix broken YCbCr subpixel positioning. Caught by the unit tests.
X-Git-Tag: 1.2.0~33
X-Git-Url: https://git.sesse.net/?p=movit;a=commitdiff_plain;h=2b85d54dac93d98400c78eff109750ad19c4219b

Fix broken YCbCr subpixel positioning. Caught by the unit tests.
---

diff --git a/ycbcr.cpp b/ycbcr.cpp
index 6dbcd9d..277ea9c 100644
--- a/ycbcr.cpp
+++ b/ycbcr.cpp
@@ -52,7 +52,7 @@ float compute_chroma_offset(float pos, unsigned subsampling_factor, unsigned res
 		// x + (-0) can be optimized away freely, as opposed to x + 0.
 		return -0.0;
 	} else {
-		return (local_chroma_pos - 0.5) / resolution;
+		return (0.5 - local_chroma_pos) / resolution;
 	}
 }