[gtk/wip/otte/lottie: 8/11] curve: Split eval() into get_point() and get_tangent()
- From: Benjamin Otte <otte src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk/wip/otte/lottie: 8/11] curve: Split eval() into get_point() and get_tangent()
- Date: Tue, 8 Dec 2020 20:34:40 +0000 (UTC)
commit 5b0266409539ab1139a0e80349e012af8cd80691
Author: Benjamin Otte <otte redhat com>
Date: Tue Dec 8 20:12:33 2020 +0100
curve: Split eval() into get_point() and get_tangent()
That's more in line with the get_start/end_point/tangent() functions.
Plus, those calls are independent and we usually want one or the other.
gsk/gskcontour.c | 5 +-
gsk/gskcurve.c | 167 ++++++++++++++++++++++++++++----------------------
gsk/gskcurveprivate.h | 6 +-
3 files changed, 103 insertions(+), 75 deletions(-)
---
diff --git a/gsk/gskcontour.c b/gsk/gskcontour.c
index 528540d2ad..aaef60cdb3 100644
--- a/gsk/gskcontour.c
+++ b/gsk/gskcontour.c
@@ -1135,7 +1135,10 @@ gsk_standard_contour_measure_get_point (GskStandardContour *self,
gsk_curve_init (&curve, self->ops[op]);
- gsk_curve_eval (&curve, progress, pos, tangent);
+ if (pos)
+ gsk_curve_get_point (&curve, progress, pos);
+ if (tangent)
+ gsk_curve_get_tangent (&curve, progress, tangent);
}
static void
diff --git a/gsk/gskcurve.c b/gsk/gskcurve.c
index e7226e737f..a078fcc18e 100644
--- a/gsk/gskcurve.c
+++ b/gsk/gskcurve.c
@@ -29,9 +29,11 @@ struct _GskCurveClass
{
void (* init) (GskCurve *curve,
gskpathop op);
- void (* eval) (const GskCurve *curve,
- float progress,
- graphene_point_t *pos,
+ void (* get_point) (const GskCurve *curve,
+ float t,
+ graphene_point_t *pos);
+ void (* get_tangent) (const GskCurve *curve,
+ float t,
graphene_vec2_t *tangent);
void (* split) (const GskCurve *curve,
float progress,
@@ -83,21 +85,23 @@ gsk_line_curve_init (GskCurve *curve,
}
static void
-gsk_line_curve_eval (const GskCurve *curve,
- float progress,
- graphene_point_t *pos,
- graphene_vec2_t *tangent)
+gsk_line_curve_get_point (const GskCurve *curve,
+ float t,
+ graphene_point_t *pos)
{
const GskLineCurve *self = &curve->line;
- if (pos)
- graphene_point_interpolate (&self->points[0], &self->points[1], progress, pos);
+ graphene_point_interpolate (&self->points[0], &self->points[1], t, pos);
+}
- if (tangent)
- {
- graphene_vec2_init (tangent, self->points[1].x - self->points[0].x, self->points[1].y -
self->points[0].y);
- graphene_vec2_normalize (tangent, tangent);
- }
+static void
+gsk_line_curve_get_tangent (const GskCurve *curve,
+ float t,
+ graphene_vec2_t *tangent)
+{
+ const GskLineCurve *self = &curve->line;
+
+ get_tangent (&self->points[0], &self->points[1], tangent);
}
static void
@@ -153,8 +157,8 @@ gsk_line_curve_get_end_point (const GskCurve *curve)
}
static void
-gsk_line_curve_get_tangent (const GskCurve *curve,
- graphene_vec2_t *tangent)
+gsk_line_curve_get_start_end_tangent (const GskCurve *curve,
+ graphene_vec2_t *tangent)
{
const GskLineCurve *self = &curve->line;
@@ -163,14 +167,15 @@ gsk_line_curve_get_tangent (const GskCurve *curve,
static const GskCurveClass GSK_LINE_CURVE_CLASS = {
gsk_line_curve_init,
- gsk_line_curve_eval,
+ gsk_line_curve_get_point,
+ gsk_line_curve_get_tangent,
gsk_line_curve_split,
gsk_line_curve_decompose,
gsk_line_curve_pathop,
gsk_line_curve_get_start_point,
gsk_line_curve_get_end_point,
- gsk_line_curve_get_tangent,
- gsk_line_curve_get_tangent
+ gsk_line_curve_get_start_end_tangent,
+ gsk_line_curve_get_start_end_tangent
};
/** CURVE **/
@@ -214,26 +219,33 @@ gsk_curve_curve_ensure_coefficients (const GskCurveCurve *curve)
}
static void
-gsk_curve_curve_eval (const GskCurve *curve,
- float progress,
- graphene_point_t *pos,
- graphene_vec2_t *tangent)
+gsk_curve_curve_get_point (const GskCurve *curve,
+ float t,
+ graphene_point_t *pos)
{
const GskCurveCurve *self = &curve->curve;
const graphene_point_t *c = self->coeffs;
gsk_curve_curve_ensure_coefficients (self);
- if (pos)
- *pos = GRAPHENE_POINT_INIT (((c[0].x * progress + c[1].x) * progress +c[2].x) * progress + c[3].x,
- ((c[0].y * progress + c[1].y) * progress +c[2].y) * progress + c[3].y);
- if (tangent)
- {
- graphene_vec2_init (tangent,
- (3.0f * c[0].x * progress + 2.0f * c[1].x) * progress + c[2].x,
- (3.0f * c[0].y * progress + 2.0f * c[1].y) * progress + c[2].y);
- graphene_vec2_normalize (tangent, tangent);
- }
+ *pos = GRAPHENE_POINT_INIT (((c[0].x * t + c[1].x) * t +c[2].x) * t + c[3].x,
+ ((c[0].y * t + c[1].y) * t +c[2].y) * t + c[3].y);
+}
+
+static void
+gsk_curve_curve_get_tangent (const GskCurve *curve,
+ float t,
+ graphene_vec2_t *tangent)
+{
+ const GskCurveCurve *self = &curve->curve;
+ const graphene_point_t *c = self->coeffs;
+
+ gsk_curve_curve_ensure_coefficients (self);
+
+ graphene_vec2_init (tangent,
+ (3.0f * c[0].x * t + 2.0f * c[1].x) * t + c[2].x,
+ (3.0f * c[0].y * t + 2.0f * c[1].y) * t + c[2].y);
+ graphene_vec2_normalize (tangent, tangent);
}
static void
@@ -355,7 +367,8 @@ gsk_curve_curve_get_end_tangent (const GskCurve *curve,
static const GskCurveClass GSK_CURVE_CURVE_CLASS = {
gsk_curve_curve_init,
- gsk_curve_curve_eval,
+ gsk_curve_curve_get_point,
+ gsk_curve_curve_get_tangent,
gsk_curve_curve_split,
gsk_curve_curve_decompose,
gsk_curve_curve_pathop,
@@ -439,46 +452,48 @@ gsk_conic_curve_eval_point (const GskConicCurve *self,
}
static void
-gsk_conic_curve_eval (const GskCurve *curve,
- float progress,
- graphene_point_t *pos,
- graphene_vec2_t *tangent)
+gsk_conic_curve_get_point (const GskCurve *curve,
+ float t,
+ graphene_point_t *pos)
{
const GskConicCurve *self = &curve->conic;
gsk_conic_curve_ensure_coefficents (self);
- if (pos)
- gsk_conic_curve_eval_point (self, progress, pos);
+ gsk_conic_curve_eval_point (self, t, pos);
+}
- if (tangent)
- {
- graphene_point_t tmp;
- float w = gsk_conic_curve_get_weight (self);
- const graphene_point_t *pts = self->points;
-
- /* The tangent will be 0 in these corner cases, just
- * treat it like a line here. */
- if ((progress <= 0.f && graphene_point_equal (&pts[0], &pts[1])) ||
- (progress >= 1.f && graphene_point_equal (&pts[1], &pts[3])))
- {
- graphene_vec2_init (tangent, pts[3].x - pts[0].x, pts[3].y - pts[0].y);
- return;
- }
+static void
+gsk_conic_curve_get_tangent (const GskCurve *curve,
+ float t,
+ graphene_vec2_t *tangent)
+{
+ const GskConicCurve *self = &curve->conic;
+ graphene_point_t tmp;
+ float w = gsk_conic_curve_get_weight (self);
+ const graphene_point_t *pts = self->points;
- gsk_curve_eval_quad ((graphene_point_t[3]) {
- GRAPHENE_POINT_INIT ((w - 1) * (pts[3].x - pts[0].x),
- (w - 1) * (pts[3].y - pts[0].y)),
- GRAPHENE_POINT_INIT (pts[3].x - pts[0].x - 2 * w * (pts[1].x - pts[0].x),
- pts[3].y - pts[0].y - 2 * w * (pts[1].y - pts[0].y)),
- GRAPHENE_POINT_INIT (w * (pts[1].x - pts[0].x),
- w * (pts[1].y - pts[0].y))
- },
- progress,
- &tmp);
- graphene_vec2_init (tangent, tmp.x, tmp.y);
- graphene_vec2_normalize (tangent, tangent);
+ /* The tangent will be 0 in these corner cases, just
+ * treat it like a line here. */
+ if ((t <= 0.f && graphene_point_equal (&pts[0], &pts[1])) ||
+ (t >= 1.f && graphene_point_equal (&pts[1], &pts[3])))
+ {
+ graphene_vec2_init (tangent, pts[3].x - pts[0].x, pts[3].y - pts[0].y);
+ return;
}
+
+ gsk_curve_eval_quad ((graphene_point_t[3]) {
+ GRAPHENE_POINT_INIT ((w - 1) * (pts[3].x - pts[0].x),
+ (w - 1) * (pts[3].y - pts[0].y)),
+ GRAPHENE_POINT_INIT (pts[3].x - pts[0].x - 2 * w * (pts[1].x - pts[0].x),
+ pts[3].y - pts[0].y - 2 * w * (pts[1].y - pts[0].y)),
+ GRAPHENE_POINT_INIT (w * (pts[1].x - pts[0].x),
+ w * (pts[1].y - pts[0].y))
+ },
+ t,
+ &tmp);
+ graphene_vec2_init (tangent, tmp.x, tmp.y);
+ graphene_vec2_normalize (tangent, tangent);
}
static void
@@ -688,7 +703,8 @@ gsk_conic_curve_get_end_tangent (const GskCurve *curve,
static const GskCurveClass GSK_CONIC_CURVE_CLASS = {
gsk_conic_curve_init,
- gsk_conic_curve_eval,
+ gsk_conic_curve_get_point,
+ gsk_conic_curve_get_tangent,
gsk_conic_curve_split,
gsk_conic_curve_decompose,
gsk_conic_curve_pathop,
@@ -723,12 +739,19 @@ gsk_curve_init (GskCurve *curve,
}
void
-gsk_curve_eval (const GskCurve *curve,
- float progress,
- graphene_point_t *pos,
- graphene_vec2_t *tangent)
+gsk_curve_get_point (const GskCurve *curve,
+ float progress,
+ graphene_point_t *pos)
+{
+ get_class (curve->op)->get_point (curve, progress, pos);
+}
+
+void
+gsk_curve_get_tangent (const GskCurve *curve,
+ float progress,
+ graphene_vec2_t *tangent)
{
- get_class (curve->op)->eval (curve, progress, pos, tangent);
+ get_class (curve->op)->get_tangent (curve, progress, tangent);
}
void
diff --git a/gsk/gskcurveprivate.h b/gsk/gskcurveprivate.h
index 0f4e89d2c5..1fd7794836 100644
--- a/gsk/gskcurveprivate.h
+++ b/gsk/gskcurveprivate.h
@@ -82,9 +82,11 @@ typedef gboolean (* GskCurveAddLineFunc) (const graphene_point_t *from,
void gsk_curve_init (GskCurve *curve,
gskpathop op);
-void gsk_curve_eval (const GskCurve *curve,
+void gsk_curve_get_point (const GskCurve *curve,
+ float progress,
+ graphene_point_t *pos);
+void gsk_curve_get_tangent (const GskCurve *curve,
float progress,
- graphene_point_t *pos,
graphene_vec2_t *tangent);
void gsk_curve_split (const GskCurve *curve,
float progress,
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