Add an assert to check that sws_getContext() succeeded.

diff --git a/src/lib/image.cc b/src/lib/image.cc
index 4c60fe8886fca9be82a3ea741390049c7f83dbf2..2167918f8d1055c1c7fff274021797fb767b84bc 100644 (file)
--- a/src/lib/image.cc
+++ b/src/lib/image.cc
@@ -351,6 +351,8 @@ Image::scale (dcp::Size out_size, dcp::YUVToRGB yuv_to_rgb, AVPixelFormat out_fo
                (fast ? SWS_FAST_BILINEAR : SWS_BICUBIC) | SWS_ACCURATE_RND, 0, 0, 0
                );
 
+       DCPOMATIC_ASSERT(scale_context);
+
        DCPOMATIC_ASSERT (yuv_to_rgb < dcp::YUVToRGB::COUNT);
        EnumIndexedVector<int, dcp::YUVToRGB> lut;
        lut[dcp::YUVToRGB::REC601] = SWS_CS_ITU601;