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path: Change semantics of gtk_path_builder_add_segment()

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Allow start >= end to mean that the path continues at the beginning
after reaching the end until it reaches the point at @end.
This commit is contained in:
Benjamin Otte
2020-12-17 06:55:54 +01:00
committed by Matthias Clasen
parent c28fd1dbe6
commit 846ae95818
4 changed files with 102 additions and 41 deletions
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28
gsk/gskcontour.c
View File

@@ -76,6 +76,7 @@ struct _GskContourClass
void (* add_segment) (const GskContour *contour,
GskPathBuilder *builder,
gpointer measure_data,
gboolean emit_move_to,
float start,
float end);
int (* get_winding) (const GskContour *contour,
@@ -395,6 +396,7 @@ static void
gsk_rect_contour_add_segment (const GskContour *contour,
GskPathBuilder *builder,
gpointer measure_data,
gboolean emit_move_to,
float start,
float end)
{
@@ -404,7 +406,8 @@ gsk_rect_contour_add_segment (const GskContour *contour,
if (start < w)
{
gsk_path_builder_move_to (builder, self->x + start * (w / self->width), self->y);
if (emit_move_to)
gsk_path_builder_move_to (builder, self->x + start * (w / self->width), self->y);
if (end <= w)
{
gsk_path_builder_line_to (builder, self->x + end * (w / self->width), self->y);
@@ -417,7 +420,7 @@ gsk_rect_contour_add_segment (const GskContour *contour,
if (start < h)
{
if (start >= 0)
if (start >= 0 && emit_move_to)
gsk_path_builder_move_to (builder, self->x + self->width, self->y + start * (h / self->height));
if (end <= h)
{
@@ -431,7 +434,7 @@ gsk_rect_contour_add_segment (const GskContour *contour,
if (start < w)
{
if (start >= 0)
if (start >= 0 && emit_move_to)
gsk_path_builder_move_to (builder, self->x + (w - start) * (w / self->width), self->y + self->height);
if (end <= w)
{
@@ -445,7 +448,7 @@ gsk_rect_contour_add_segment (const GskContour *contour,
if (start < h)
{
if (start >= 0)
if (start >= 0 && emit_move_to)
gsk_path_builder_move_to (builder, self->x, self->y + (h - start) * (h / self->height));
if (end <= h)
{
@@ -782,6 +785,7 @@ static void
gsk_circle_contour_add_segment (const GskContour *contour,
GskPathBuilder *builder,
gpointer measure_data,
gboolean emit_move_to,
float start,
float end)
{
@@ -790,6 +794,8 @@ gsk_circle_contour_add_segment (const GskContour *contour,
float length = self->radius * DEG_TO_RAD (delta);
GskContour *segment;
if (!emit_move_to)
g_warning ("FIXME: somebody needs to decompose contours into segments differently");
segment = gsk_circle_contour_new (&self->center, self->radius,
self->start_angle + start/length * delta,
self->start_angle + end/length * delta);
@@ -1325,6 +1331,7 @@ static void
gsk_standard_contour_add_segment (const GskContour *contour,
GskPathBuilder *builder,
gpointer measure_data,
gboolean emit_move_to,
float start,
float end)
{
@@ -1376,7 +1383,8 @@ gsk_standard_contour_add_segment (const GskContour *contour,
{
gsk_curve_segment (&curve, start_progress, end_progress, &cut);
start_point = gsk_curve_get_start_point (&cut);
gsk_path_builder_move_to (builder, start_point->x, start_point->y);
if (emit_move_to)
gsk_path_builder_move_to (builder, start_point->x, start_point->y);
gsk_curve_builder_to (&cut, builder);
return;
}
@@ -1384,12 +1392,13 @@ gsk_standard_contour_add_segment (const GskContour *contour,
gsk_curve_split (&curve, start_progress, NULL, &cut);
start_point = gsk_curve_get_start_point (&cut);
gsk_path_builder_move_to (builder, start_point->x, start_point->y);
if (emit_move_to)
gsk_path_builder_move_to (builder, start_point->x, start_point->y);
gsk_curve_builder_to (&cut, builder);
i = start_measure->op + 1;
}
else
i = 0;
else
i = emit_move_to ? 0 : 1;
for (; i < (end_measure ? end_measure->op : self->n_ops - 1); i++)
{
@@ -1721,10 +1730,11 @@ void
gsk_contour_add_segment (const GskContour *self,
GskPathBuilder *builder,
gpointer measure_data,
gboolean emit_move_to,
float start,
float end)
{
self->klass->add_segment (self, builder, measure_data, start, end);
self->klass->add_segment (self, builder, measure_data, emit_move_to, start, end);
}
int

1
gsk/gskcontourprivate.h
View File

@@ -94,6 +94,7 @@ int gsk_contour_get_winding (const GskContou
void gsk_contour_add_segment (const GskContour *self,
GskPathBuilder *builder,
gpointer measure_data,
gboolean emit_move_to,
float start,
float end);
gboolean gsk_contour_get_stroke_bounds (const GskContour *self,

91
gsk/gskpathmeasure.c
View File

@@ -525,6 +525,44 @@ gsk_path_measure_in_fill (GskPathMeasure *self,
}
}
static void
gsk_path_builder_add_segment_chunk (GskPathBuilder *self,
GskPathMeasure *measure,
gboolean emit_move_to,
float start,
float end)
{
g_assert (start < end);
for (gsize i = measure->first; i < measure->last; i++)
{
if (measure->measures[i].length < start)
{
start -= measure->measures[i].length;
end -= measure->measures[i].length;
}
else if (start > 0 || end < measure->measures[i].length)
{
float len = MIN (end, measure->measures[i].length);
gsk_contour_add_segment (gsk_path_get_contour (measure->path, i),
self,
measure->measures[i].contour_data,
emit_move_to,
start,
len);
end -= len;
start = 0;
if (end <= 0)
break;
}
else
{
end -= measure->measures[i].length;
gsk_path_builder_add_contour (self, gsk_contour_dup (gsk_path_get_contour (measure->path, i)));
}
emit_move_to = TRUE;
}
}
/**
* gsk_path_builder_add_segment:
@@ -539,7 +577,10 @@ gsk_path_measure_in_fill (GskPathMeasure *self,
* from 0 for the beginning of the path to [method@Gsk.PathMeasure.get_length]
* for the end of the path. The values will be clamped to that range.
*
* If @start >= @end after clamping, no path will be added.
* If @start >= @end after clamping, the path will first add the segment
* from @start to the end of the path, and then add the segment from
* the beginning to @end. If the path is closed, these segments will
* be connected.
**/
void
gsk_path_builder_add_segment (GskPathBuilder *builder,
@@ -547,40 +588,34 @@ gsk_path_builder_add_segment (GskPathBuilder *builder,
float start,
float end)
{
gsize i;
g_return_if_fail (builder != NULL);
g_return_if_fail (measure != NULL);
start = gsk_path_measure_clamp_distance (measure, start);
end = gsk_path_measure_clamp_distance (measure, end);
if (start >= end)
return;
for (i = measure->first; i < measure->last; i++)
if (start < end)
{
if (measure->measures[i].length < start)
{
start -= measure->measures[i].length;
end -= measure->measures[i].length;
}
else if (start > 0 || end < measure->measures[i].length)
{
float len = MIN (end, measure->measures[i].length);
gsk_contour_add_segment (gsk_path_get_contour (measure->path, i),
builder,
measure->measures[i].contour_data,
start,
len);
end -= len;
start = 0;
if (end <= 0)
break;
}
gsk_path_builder_add_segment_chunk (builder, measure, TRUE, start, end);
}
else
{
/* If the path is closed, we can connect the 2 subpaths. */
gboolean closed = gsk_path_measure_is_closed (measure);
gboolean need_move_to = !closed;
if (start < measure->length)
gsk_path_builder_add_segment_chunk (builder, measure,
TRUE,
start, measure->length);
else
{
end -= measure->measures[i].length;
gsk_path_builder_add_contour (builder, gsk_contour_dup (gsk_path_get_contour (measure->path, i)));
}
need_move_to = TRUE;
if (end > 0)
gsk_path_builder_add_segment_chunk (builder, measure,
need_move_to,
0, end);
if (start == end && closed)
gsk_path_builder_close (builder);
}
}

23
testsuite/gsk/path.c
View File

@@ -609,7 +609,10 @@ test_segment_start (void)
path1 = gsk_path_builder_free_to_path (builder);
measure1 = gsk_path_measure_new (path1);
g_assert_cmpfloat_with_epsilon (seg_length, gsk_path_measure_get_length (measure1), epsilon);
if (seg_length == 0)
g_assert_cmpfloat_with_epsilon (gsk_path_measure_get_length (measure), gsk_path_measure_get_length (measure1), epsilon);
else
g_assert_cmpfloat_with_epsilon (seg_length, gsk_path_measure_get_length (measure1), epsilon);
gsk_path_measure_unref (measure1);
gsk_path_unref (path1);
@@ -642,7 +645,10 @@ test_segment_end (void)
path1 = gsk_path_builder_free_to_path (builder);
measure1 = gsk_path_measure_new (path1);
g_assert_cmpfloat_with_epsilon (seg_length, gsk_path_measure_get_length (measure1), epsilon);
if (seg_length == 0)
g_assert_cmpfloat_with_epsilon (gsk_path_measure_get_length (measure), gsk_path_measure_get_length (measure1), epsilon);
else
g_assert_cmpfloat_with_epsilon (seg_length, gsk_path_measure_get_length (measure1), epsilon);
gsk_path_measure_unref (measure1);
gsk_path_unref (path1);
@@ -655,8 +661,8 @@ test_segment_end (void)
static void
test_segment_chunk (void)
{
GskPath *path, *path1;
GskPathMeasure *measure, *measure1;
GskPath *path, *path1, *path2;
GskPathMeasure *measure, *measure1, *measure2;
GskPathBuilder *builder;
float epsilon, length;
guint i;
@@ -677,6 +683,15 @@ test_segment_chunk (void)
g_assert_cmpfloat_with_epsilon (length / 2, gsk_path_measure_get_length (measure1), epsilon);
builder = gsk_path_builder_new ();
gsk_path_builder_add_segment (builder, measure, seg_start + length / 2, seg_start);
path2 = gsk_path_builder_free_to_path (builder);
measure2 = gsk_path_measure_new (path2);
g_assert_cmpfloat_with_epsilon (length / 2, gsk_path_measure_get_length (measure2), epsilon);
gsk_path_measure_unref (measure2);
gsk_path_unref (path2);
gsk_path_measure_unref (measure1);
gsk_path_unref (path1);
}