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swrast: use memmove() instead of memcpy() in the SHIFT_ARRAY macro

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The src/dst arrays would overlap but dst was less than src so a simple
version of memcpy() would do the right thing.  But this isn't guaranteed
when memcpy() is optimized.

Fixes demos/copypix when the dest region was clipped by the left side of
the window.

Reviewed-by: Adam Jackson <ajax@redhat.com>
This commit is contained in:
Brian Paul 2012-01-05 11:59:30 -07:00
parent 59be691638
commit a44d715d2b
1 changed files with 1 additions and 1 deletions
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2
src/mesa/swrast/s_span.c
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@ -776,7 +776,7 @@ clip_span( struct gl_context *ctx, SWspan *span )
span->intTex[1] += leftClip * span->intTexStep[1];
#define SHIFT_ARRAY(ARRAY, SHIFT, LEN) \
memcpy(ARRAY, ARRAY + (SHIFT), (LEN) * sizeof(ARRAY[0]))
memmove(ARRAY, ARRAY + (SHIFT), (LEN) * sizeof(ARRAY[0]))
for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
if (span->arrayAttribs & (1 << i)) {