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-rw-r--r--src/blind-hexagon-tessellation.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/blind-hexagon-tessellation.c b/src/blind-hexagon-tessellation.c
index abb5c7a..377c110 100644
--- a/src/blind-hexagon-tessellation.c
+++ b/src/blind-hexagon-tessellation.c
@@ -47,10 +47,13 @@ main(int argc, char *argv[])
diameter = etozu_arg("block-diameter", argv[0], 1, SIZE_MAX);
eset_pixel_format(&stream, pixfmt);
+ CHECK_N_CHAN(&stream, 4, 4);
if (stream.encoding == DOUBLE)
SET_XYZA(double);
- else
+ else if (stream.encoding == FLOAT)
SET_XYZA(float);
+ else
+ eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
stream.width = (size_t)((double)diameter * sqrt(3.));
stream.height = diameter * 3 / 2;