From: Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
Date: Wed, 22 Jan 2020 20:06:44 +0000 (+0100)
Subject: add nan test in _build_vb_step to prevent stroke building for two consecutive points... 
X-Git-Tag: v0.1-alpha~45
X-Git-Url: https://git.osiis.dedyn.io/?a=commitdiff_plain;h=ba0f72391af2f4007c9e3d4e1775f18f7f5b147e;p=jp%2Fvkvg.git

add nan test in _build_vb_step to prevent stroke building for two consecutive points that are equals
---

diff --git a/src/vectors.c b/src/vectors.c
index 686db85..b29180b 100644
--- a/src/vectors.c
+++ b/src/vectors.c
@@ -108,3 +108,11 @@ void vec2_inv (vec2* v){
     v->x = -v->x;
     v->y = -v->y;
 }
+// test if one component of float vector is nan
+inline bool vec2_isnan (vec2 v){
+    return (bool)(isnanf (v.x) || isnanf (v.y));
+}
+// test if one component of double vector is nan
+inline bool vec2d_isnan (vec2d v){
+    return (bool)(isnan (v.x) || isnan (v.y));
+}
diff --git a/src/vectors.h b/src/vectors.h
index 6352e5e..97b0f6c 100644
--- a/src/vectors.h
+++ b/src/vectors.h
@@ -80,6 +80,7 @@ vec2		vec2_sub	(vec2 a, vec2 b);
 vec2		vec2_mult	(vec2 a, float m);
 bool		vec2_equ	(vec2 a, vec2 b);
 vec2		vec2_line_norm	(vec2 a, vec2 b);
+bool        vec2_isnan  (vec2 v);
 
 double		vec2d_length(vec2d v);
 vec2d		vec2d_norm	(vec2d a);
@@ -88,6 +89,7 @@ vec2d		vec2d_add	(vec2d a, vec2d b);
 vec2d		vec2d_sub	(vec2d a, vec2d b);
 vec2d		vec2d_mult	(vec2d a, double m);
 vec2d		vec2d_line_norm(vec2d a, vec2d b);
+bool        vec2d_isnan  (vec2d v);
 
 vec2		vec2d_to_vec2(vec2d vd);
 void        vec2_inv    (vec2* v);
diff --git a/src/vkvg_context_internal.c b/src/vkvg_context_internal.c
index e3136a7..76e7f0a 100644
--- a/src/vkvg_context_internal.c
+++ b/src/vkvg_context_internal.c
@@ -665,8 +665,13 @@ void _init_descriptor_sets (VkvgContext ctx){
 }
 
 float _build_vb_step (vkvg_context* ctx, Vertex v, float hw, uint32_t iL, uint32_t i, uint32_t iR, bool isCurve){
+    //if two of the three points are equal, normal is null
     vec2 v0n = vec2_line_norm(ctx->points[iL], ctx->points[i]);
+    if (vec2_isnan(v0n))
+        return 0;
     vec2 v1n = vec2_line_norm(ctx->points[i], ctx->points[iR]);
+    if (vec2_isnan(v1n))
+        return 0;
 
     vec2 bisec = vec2_norm(vec2_add(v0n,v1n));