Fix build with newer libsub.

[dcpomatic.git] / src / lib / image.cc

diff --git a/src/lib/image.cc b/src/lib/image.cc
index 801b39b0fced2f9feba50b9371e500d0c4b28bdc..2167918f8d1055c1c7fff274021797fb767b84bc 100644 (file)
--- a/src/lib/image.cc
+++ b/src/lib/image.cc
@@ -339,6 +339,10 @@ Image::scale (dcp::Size out_size, dcp::YUVToRGB yuv_to_rgb, AVPixelFormat out_fo
           the input image alignment is not PADDED.
        */
        DCPOMATIC_ASSERT (alignment() == Alignment::PADDED);
+       DCPOMATIC_ASSERT(size().width > 0);
+       DCPOMATIC_ASSERT(size().height > 0);
+       DCPOMATIC_ASSERT(out_size.width > 0);
+       DCPOMATIC_ASSERT(out_size.height > 0);
 
        auto scaled = make_shared<Image>(out_format, out_size, out_alignment);
        auto scale_context = sws_getContext (
@@ -347,6 +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;