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image: Improve resize quality at the edges.

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get_pix() returns opaque black pixels for out-of-bounds coordinates, resulting
in spurious averages at the edges. The attached patch appears to fix the
problem, at least for the floating-point resizers.

From SF user R.L. Horn.
This commit is contained in:
Justin Maggard 2015-02-09 18:01:54 -08:00
parent 24fb139678
commit f18c3cee6f
1 changed files with 11 additions and 9 deletions
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20
image_utils.c
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@ -210,15 +210,17 @@ image_free(image_s *pimage)
pix pix
get_pix(image_s *pimage, int32_t x, int32_t y) get_pix(image_s *pimage, int32_t x, int32_t y)
{ {
if((x >= 0) && (y >= 0) && (x < pimage->width) && (y < pimage->height)) if (x < 0)
{ x = 0;
return(pimage->buf[(y * pimage->width) + x]); else if (x >= pimage->width)
} x = pimage->width - 1;
else
{ if (y < 0)
pix vpix = BLACK; y = 0;
return(vpix); else if (y >= pimage->height)
} y = pimage->height - 1;
return(pimage->buf[(y * pimage->width) + x]);
} }
void void