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Add gsk_curve_reverse

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This will be used in stroking.
This commit is contained in:
Matthias Clasen
2020-12-13 00:42:53 -05:00
parent 5f40db5043
commit 0bef169b32
2 changed files with 56 additions and 3 deletions
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57
gsk/gskcurve.c
View File

@@ -70,6 +70,8 @@ struct _GskCurveClass
void (* offset) (const GskCurve *curve,
float distance,
GskCurve *offset_curve);
void (* reverse) (const GskCurve *curve,
GskCurve *reverse);
};
static void
@@ -313,6 +315,17 @@ gsk_line_curve_offset (const GskCurve *curve,
gsk_curve_init (offset_curve, gsk_pathop_encode (GSK_PATH_LINE, p));
}
static void
gsk_line_curve_reverse (const GskCurve *curve,
GskCurve *reverse)
{
const GskLineCurve *self = &curve->line;
reverse->op = GSK_PATH_LINE;
reverse->line.points[0] = self->points[1];
reverse->line.points[1] = self->points[0];
}
static const GskCurveClass GSK_LINE_CURVE_CLASS = {
gsk_line_curve_init,
gsk_line_curve_init_foreach,
@@ -329,7 +342,8 @@ static const GskCurveClass GSK_LINE_CURVE_CLASS = {
gsk_line_curve_get_start_end_tangent,
gsk_line_curve_get_bounds,
gsk_line_curve_get_bounds,
gsk_line_curve_offset
gsk_line_curve_offset,
gsk_line_curve_reverse
};
/** CURVE **/
@@ -676,6 +690,20 @@ gsk_curve_curve_offset (const GskCurve *curve,
gsk_curve_curve_init_from_points (&offset->curve, p);
}
static void
gsk_curve_curve_reverse (const GskCurve *curve,
GskCurve *reverse)
{
const GskCurveCurve *self = &curve->curve;
reverse->op = GSK_PATH_CURVE;
reverse->curve.points[0] = self->points[3];
reverse->curve.points[1] = self->points[2];
reverse->curve.points[2] = self->points[1];
reverse->curve.points[3] = self->points[0];
reverse->curve.has_coefficients = FALSE;
}
static const GskCurveClass GSK_CURVE_CURVE_CLASS = {
gsk_curve_curve_init,
gsk_curve_curve_init_foreach,
@@ -692,7 +720,8 @@ static const GskCurveClass GSK_CURVE_CURVE_CLASS = {
gsk_curve_curve_get_end_tangent,
gsk_curve_curve_get_bounds,
gsk_curve_curve_get_tight_bounds,
gsk_curve_curve_offset
gsk_curve_curve_offset,
gsk_curve_curve_reverse
};
/** CONIC **/
@@ -1285,6 +1314,20 @@ gsk_conic_curve_offset (const GskCurve *curve,
gsk_conic_curve_init_from_points (&offset->conic, p);
}
static void
gsk_conic_curve_reverse (const GskCurve *curve,
GskCurve *reverse)
{
const GskConicCurve *self = &curve->conic;
reverse->op = GSK_PATH_CONIC;
reverse->conic.points[0] = self->points[3];
reverse->conic.points[1] = self->points[1];
reverse->conic.points[2] = self->points[2];
reverse->conic.points[3] = self->points[0];
reverse->conic.has_coefficients = FALSE;
}
static const GskCurveClass GSK_CONIC_CURVE_CLASS = {
gsk_conic_curve_init,
gsk_conic_curve_init_foreach,
@@ -1301,7 +1344,8 @@ static const GskCurveClass GSK_CONIC_CURVE_CLASS = {
gsk_conic_curve_get_end_tangent,
gsk_conic_curve_get_bounds,
gsk_conic_curve_get_tight_bounds,
gsk_conic_curve_offset
gsk_conic_curve_offset,
gsk_conic_curve_reverse
};
/** API **/
@@ -1449,3 +1493,10 @@ gsk_curve_offset (const GskCurve *curve,
{
get_class (curve->op)->offset (curve, distance, offset_curve);
}
void
gsk_curve_reverse (const GskCurve *curve,
GskCurve *reverse)
{
get_class (curve->op)->reverse (curve, reverse);
}

2
gsk/gskcurveprivate.h
View File

@@ -135,6 +135,8 @@ int gsk_curve_intersect (const GskCurve
void gsk_curve_offset (const GskCurve *curve,
float distance,
GskCurve *offset_curve);
void gsk_curve_reverse (const GskCurve *curve,
GskCurve *reverse);
G_END_DECLS