Bugfix T41042: Irrelevant Bezier handles still affect Graph Editor Show All

The "Show All" and "Show Selected" operators in the Graph Editor was taking into
account all handles on keyframes, even when some of those would be invalid and/or
set to nonsense values (e.g. for any interpolation mode other than "Bezier")

1 files changed, 20 insertions, 9 deletions

diff --git a/source/blender/blenkernel/intern/fcurve.c b/source/blender/blenkernel/intern/fcurve.c
index daf872ef4cc..5ad8a1c8d74 100644
--- a/source/blender/blenkernel/intern/fcurve.c
+++ b/source/blender/blenkernel/intern/fcurve.c
@@ -522,17 +522,28 @@ bool calc_fcurve_bounds(FCurve *fcu, float *xmin, float *xmax, float *ymin, floa
 			
 			/* only loop over keyframes to find extents for values if needed */
 			if (ymin || ymax) {
-				BezTriple *bezt;
+				BezTriple *bezt, *prevbezt = NULL;
 				
-				for (bezt = fcu->bezt, i = 0; i < fcu->totvert; bezt++, i++) {
-					if ((do_sel_only == false) || BEZSELECTED(bezt)) {
+				for (bezt = fcu->bezt, i = 0; i < fcu->totvert; prevbezt = bezt, bezt++, i++) {
+					if ((do_sel_only == false) || BEZSELECTED(bezt)) {	
+						/* keyframe itself */
+						yminv = min_ff(yminv, bezt->vec[1][1]);
+						ymaxv = max_ff(ymaxv, bezt->vec[1][1]);
+						
 						if (include_handles) {
-							yminv = min_ffff(yminv, bezt->vec[1][1], bezt->vec[0][1], bezt->vec[2][1]);
-							ymaxv = max_ffff(ymaxv, bezt->vec[1][1], bezt->vec[0][1], bezt->vec[2][1]);
-						}
-						else {
-							yminv = min_ff(yminv, bezt->vec[1][1]);
-							ymaxv = max_ff(ymaxv, bezt->vec[1][1]);
+							/* left handle - only if applicable 
+							 * NOTE: for the very first keyframe, the left handle actually has no bearings on anything
+							 */
+							if (prevbezt && (prevbezt->ipo == BEZT_IPO_BEZ)) {
+								yminv = min_ff(yminv, bezt->vec[0][1]);
+								ymaxv = max_ff(ymaxv, bezt->vec[0][1]);
+							}
+							
+							/* right handle - only if applicable */
+							if (bezt->ipo == BEZT_IPO_BEZ) {
+								yminv = min_ff(yminv, bezt->vec[2][1]);
+								ymaxv = min_ff(ymaxv, bezt->vec[2][1]);
+							}
 						}
 						
 						foundvert = true;