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[pdiff] Check for too small images.

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The Laplacian pyramid can only work on images larger than 3x3 due to the
size of its convolution kernel. So if the image is too small return an
error (-1) before attempting to construction the pyramid.
This commit is contained in:
Chris Wilson 2007-10-16 15:27:33 +01:00
parent 3b1cc128dc
commit fa9201b9c9
1 changed files with 3 additions and 0 deletions
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3
test/pdiff/pdiff.c
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@ -286,6 +286,9 @@ pdiff_compare (cairo_surface_t *surface_a,
w = cairo_image_surface_get_width (surface_a);
h = cairo_image_surface_get_height (surface_a);
if (w < 3 || h < 3) /* too small for the Laplacian convolution */
return -1;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
float r, g, b, l;