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curve: Add gsk_curve_reverse

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This will be used in stroking.
This commit is contained in:
Matthias Clasen
2023-06-29 23:11:36 -04:00
parent 75b73365d9
commit c1ae2f5c4b
2 changed files with 67 additions and 0 deletions
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65
gsk/gskcurve.c
View File

@@ -76,6 +76,8 @@ struct _GskCurveClass
void (* offset) (const GskCurve *curve,
float distance,
GskCurve *offset_curve);
void (* reverse) (const GskCurve *curve,
GskCurve *reverse);
};
static void
@@ -330,6 +332,17 @@ 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,
@@ -349,6 +362,7 @@ static const GskCurveClass GSK_LINE_CURVE_CLASS = {
gsk_line_curve_get_curvature,
gsk_line_curve_print,
gsk_line_curve_offset,
gsk_line_curve_reverse,
};
/** QUADRATIC **/
@@ -708,6 +722,19 @@ gsk_quad_curve_offset (const GskCurve *curve,
gsk_quad_curve_init_from_points (&offset->quad, p);
}
static void
gsk_quad_curve_reverse (const GskCurve *curve,
GskCurve *reverse)
{
const GskCubicCurve *self = &curve->cubic;
reverse->op = GSK_PATH_QUAD;
reverse->cubic.points[0] = self->points[2];
reverse->cubic.points[1] = self->points[1];
reverse->cubic.points[2] = self->points[0];
reverse->cubic.has_coefficients = FALSE;
}
static const GskCurveClass GSK_QUAD_CURVE_CLASS = {
gsk_quad_curve_init,
gsk_quad_curve_init_foreach,
@@ -727,6 +754,7 @@ static const GskCurveClass GSK_QUAD_CURVE_CLASS = {
gsk_quad_curve_get_curvature,
gsk_quad_curve_print,
gsk_quad_curve_offset,
gsk_quad_curve_reverse,
};
/** CUBIC **/
@@ -1192,6 +1220,20 @@ gsk_cubic_curve_offset (const GskCurve *curve,
gsk_cubic_curve_init_from_points (&offset->cubic, p);
}
static void
gsk_cubic_curve_reverse (const GskCurve *curve,
GskCurve *reverse)
{
const GskCubicCurve *self = &curve->cubic;
reverse->op = GSK_PATH_CUBIC;
reverse->cubic.points[0] = self->points[3];
reverse->cubic.points[1] = self->points[2];
reverse->cubic.points[2] = self->points[1];
reverse->cubic.points[3] = self->points[0];
reverse->cubic.has_coefficients = FALSE;
}
static const GskCurveClass GSK_CUBIC_CURVE_CLASS = {
gsk_cubic_curve_init,
gsk_cubic_curve_init_foreach,
@@ -1211,6 +1253,7 @@ static const GskCurveClass GSK_CUBIC_CURVE_CLASS = {
gsk_cubic_curve_get_curvature,
gsk_cubic_curve_print,
gsk_cubic_curve_offset,
gsk_cubic_curve_reverse,
};
/** CONIC **/
@@ -1864,6 +1907,20 @@ 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,
@@ -1883,6 +1940,7 @@ static const GskCurveClass GSK_CONIC_CURVE_CLASS = {
gsk_conic_curve_get_curvature,
gsk_conic_curve_print,
gsk_conic_curve_offset,
gsk_conic_curve_reverse,
};
/** API **/
@@ -2088,6 +2146,13 @@ 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);
}
static inline void
_sincosf (float angle,
float *out_s,

2
gsk/gskcurveprivate.h
View File

@@ -158,6 +158,8 @@ void gsk_curve_get_tight_bounds (const GskCurve
void gsk_curve_offset (const GskCurve *curve,
float distance,
GskCurve *offset_curve);
void gsk_curve_reverse (const GskCurve *curve,
GskCurve *reverse);
int gsk_curve_intersect (const GskCurve *curve1,
const GskCurve *curve2,