Differential D16643 Diff 58555 source/blender/blenkernel/intern/nla.c

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source/blender/blenkernel/intern/nla.c

Show First 20 Lines • Show All 967 Lines • ▼ Show 20 Lines	void BKE_nlameta_flush_transforms(NlaStrip *mstrip)
/* get the original start/end points, and calculate the start-frame offset		/* get the original start/end points, and calculate the start-frame offset
* - these are simply the start/end frames of the child strips,		* - these are simply the start/end frames of the child strips,
* since we assume they weren't transformed yet		* since we assume they weren't transformed yet
*/		*/
oStart = ((NlaStrip *)mstrip->strips.first)->start;		oStart = ((NlaStrip *)mstrip->strips.first)->start;
oEnd = ((NlaStrip *)mstrip->strips.last)->end;		oEnd = ((NlaStrip *)mstrip->strips.last)->end;
offset = mstrip->start - oStart;		offset = mstrip->start - oStart;

		/* check if scale changed */
		oLen = oEnd - oStart;
		nLen = mstrip->end - mstrip->start;
		scaleChanged = !IS_EQF(oLen, nLen);

/* optimization:		/* optimization:
* don't flush if nothing changed yet		* don't flush if nothing changed yet
* TODO: maybe we need a flag to say always flush?		* TODO: maybe we need a flag to say always flush?
*/		*/
if (IS_EQF(oStart, mstrip->start) && IS_EQF(oEnd, mstrip->end)) {		if (IS_EQF(oStart, mstrip->start) && IS_EQF(oEnd, mstrip->end) && !scaleChanged) {
return;		return;
}		}

/* check if scale changed */
oLen = oEnd - oStart;
nLen = mstrip->end - mstrip->start;
if (IS_EQF(nLen, oLen) == 0) {
scaleChanged = 1;
}

/* for each child-strip, calculate new start/end points based on this new info */		/* for each child-strip, calculate new start/end points based on this new info */
for (strip = mstrip->strips.first; strip; strip = strip->next) {		for (strip = mstrip->strips.first; strip; strip = strip->next) {
if (scaleChanged) {		if (scaleChanged) {
float p1, p2;		float p1, p2;

/* compute positions of endpoints relative to old extents of strip */		/* compute positions of endpoints relative to old extents of strip */
p1 = (strip->start - oStart) / oLen;		p1 = (strip->start - oStart) / oLen;
p2 = (strip->end - oStart) / oLen;		p2 = (strip->end - oStart) / oLen;

/* Apply new strip endpoints using the proportions,		/* Apply new strip endpoints using the proportions,
* then wait for second pass to flush scale properly. */		* then wait for second pass to flush scale properly. */
strip->start = (p1 * nLen) + mstrip->start;		strip->start = (p1 * nLen) + mstrip->start;
strip->end = (p2 * nLen) + mstrip->start;		strip->end = (p2 * nLen) + mstrip->start;

		// Recompute the playback scale, given the new start & end frame of the strip.
		const double action_len = strip->actend - strip->actstart;
		const double repeated_len = action_len * strip->repeat;
		const double strip_len = strip->end - strip->start;
		strip->scale = strip_len / repeated_len;
}		}
else {		else {
/* just apply the changes in offset to both ends of the strip */		/* just apply the changes in offset to both ends of the strip */
strip->start += offset;		strip->start += offset;
strip->end += offset;		strip->end += offset;
}		}
}		}

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