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patch [#29676] ALPHA OVER: Fix associated alpha over situation to fix [#29675] patch by Troy Sobotka

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note: if alpha is negative the code will still produce non-optimal results.
This is a separate issue though, the patch fix the premul assumption that
alpha can be zero and rgb still be valid.
This commit is contained in:
Dalai Felinto 2011-12-21 23:59:57 +00:00
parent 26f69488ca
commit 5272d76faa
1 changed files with 2 additions and 1 deletions
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source/blender/nodes/composite/nodes/node_composite_alphaOver.c
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@ -47,7 +47,8 @@ static bNodeSocketTemplate cmp_node_alphaover_out[]= {
static void do_alphaover_premul(bNode *UNUSED(node), float *out, float *src, float *over, float *fac)
{
if(over[3]<=0.0f) {
/* Zero alpha values should still permit an add of RGB data */
if(over[3]<0.0f) {
copy_v4_v4(out, src);
}
else if(fac[0]==1.0f && over[3]>=1.0f) {