[FFmpeg-cvslog] swscale/swscale_unscaled: Fix rounding difference with RGBA output between little and big endian

[Michael Niedermayer]

ffmpeg | branch: release/2.5 | Michael Niedermayer <michaelni at gmx.at> | Mon Jun 29 13:51:43 2015 +0200| [bf44ab5181d42ee74768c32b07128a176d38b0c0] | committer: Michael Niedermayer

swscale/swscale_unscaled: Fix rounding difference with RGBA output between little and big endian

Fixes fate/dds-rgb16 on big endian

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit f6ab967eae497733f6adc12b30075980fd6eea98)

Conflicts:

	tests/ref/fate/dds-rgb16

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bf44ab5181d42ee74768c32b07128a176d38b0c0
---

 libswscale/swscale_unscaled.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libswscale/swscale_unscaled.c b/libswscale/swscale_unscaled.c
index da457df..d3d0cf3 100644
--- a/libswscale/swscale_unscaled.c
+++ b/libswscale/swscale_unscaled.c
@@ -1242,6 +1242,11 @@ static rgbConvFn findRgbConvFn(SwsContext *c)
     if ((dstFormat == AV_PIX_FMT_RGB32_1 || dstFormat == AV_PIX_FMT_BGR32_1) && !isRGBA32(srcFormat) && ALT32_CORR<0)
         return NULL;
 
+    // Maintain symmetry between endianness
+    if (c->flags & SWS_BITEXACT)
+        if ((dstFormat == AV_PIX_FMT_RGB32   || dstFormat == AV_PIX_FMT_BGR32  ) && !isRGBA32(srcFormat) && ALT32_CORR>0)
+            return NULL;
+
     return conv;
 }