X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=image%2Fimage_png.cpp;h=826a071a99496d9884432ac7f5a6eb205d1e2e64;hb=dfd413a5f54bd450850b5e84886949bcdf85b1e7;hp=324cfe9814ee53ccbc8842fed32b0ca245b56329;hpb=59889aafe642e52742524da2c202a1003643fa94;p=apitrace

diff --git a/image/image_png.cpp b/image/image_png.cpp
index 324cfe9..826a071 100644
--- a/image/image_png.cpp
+++ b/image/image_png.cpp
@@ -53,6 +53,8 @@ pngWriteCallback(png_structp png_ptr, png_bytep data, png_size_t length)
 bool
 Image::writePNG(std::ostream &os) const
 {
+    assert(channelType == TYPE_UNORM8);
+
     png_structp png_ptr;
     png_infop info_ptr;
     int color_type;