From 35fdfcc6258c66ba462a4330a35deffb0f2b501d Mon Sep 17 00:00:00 2001
From: Benjamin Otte <otte@gnome.org>
Date: Thu, 10 Sep 2009 10:08:28 +0200
Subject: [PATCH] videotestsrc: Fix image for odd widths in some formats

videotestsrc rounds chroma down. This causes it to omit the last chroma
value completely for odd widths when the chroma is downsampled.
This patch special cases the last pixel to not be rounded down.
---
 gst/videotestsrc/videotestsrc.c | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/gst/videotestsrc/videotestsrc.c b/gst/videotestsrc/videotestsrc.c
index 853089dab0..88b49f2dea 100644
--- a/gst/videotestsrc/videotestsrc.c
+++ b/gst/videotestsrc/videotestsrc.c
@@ -1471,13 +1471,15 @@ static void
 paint_hline_I420 (paintinfo * p, int x, int y, int w)
 {
   int x1 = x / 2;
-  int x2 = (x + w) / 2;
+  int w1 = (x + w) / 2 - x1;
   int offset = y * p->ystride;
   int offset1 = (y / 2) * p->ustride;
 
+  if (x + w == p->width)
+    w1++;
   oil_splat_u8_ns (p->yp + offset + x, &p->yuv_color->Y, w);
-  oil_splat_u8_ns (p->up + offset1 + x1, &p->yuv_color->U, x2 - x1);
-  oil_splat_u8_ns (p->vp + offset1 + x1, &p->yuv_color->V, x2 - x1);
+  oil_splat_u8_ns (p->up + offset1 + x1, &p->yuv_color->U, w1);
+  oil_splat_u8_ns (p->vp + offset1 + x1, &p->yuv_color->V, w1);
 }
 
 static void
@@ -1688,13 +1690,14 @@ static void
 paint_hline_YUY2 (paintinfo * p, int x, int y, int w)
 {
   int x1 = x / 2;
-  int x2 = (x + w) / 2;
-  int offset;
+  int w1 = (x + w) / 2 - x1;
+  int offset = y * p->ystride;
 
-  offset = y * p->ystride;
+  if (x + w == p->width)
+    w1++;
   oil_splat_u8 (p->yp + offset + x * 2, 2, &p->yuv_color->Y, w);
-  oil_splat_u8 (p->up + offset + x1 * 4, 4, &p->yuv_color->U, x2 - x1);
-  oil_splat_u8 (p->vp + offset + x1 * 4, 4, &p->yuv_color->V, x2 - x1);
+  oil_splat_u8 (p->up + offset + x1 * 4, 4, &p->yuv_color->U, w1);
+  oil_splat_u8 (p->vp + offset + x1 * 4, 4, &p->yuv_color->V, w1);
 }
 
 static void
@@ -1760,13 +1763,15 @@ static void
 paint_hline_Y42B (paintinfo * p, int x, int y, int w)
 {
   int x1 = x / 2;
-  int x2 = (x + w) / 2;
+  int w1 = (x + w) / 2 - x1;
   int offset = y * p->ystride;
   int offset1 = y * p->ustride;
 
+  if (x + w == p->width)
+    w1++;
   oil_splat_u8_ns (p->yp + offset + x, &p->yuv_color->Y, w);
-  oil_splat_u8_ns (p->up + offset1 + x1, &p->yuv_color->U, x2 - x1);
-  oil_splat_u8_ns (p->vp + offset1 + x1, &p->yuv_color->V, x2 - x1);
+  oil_splat_u8_ns (p->up + offset1 + x1, &p->yuv_color->U, w1);
+  oil_splat_u8_ns (p->vp + offset1 + x1, &p->yuv_color->V, w1);
 }
 
 static void