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pathmeasure: Add gsk_path_measure_add_segment()

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This allows chunking paths, weeee.
This commit is contained in:
Benjamin Otte
2020-11-12 05:35:14 +01:00
parent 323a054a90
commit c5befbadd7
4 changed files with 254 additions and 3 deletions
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185
gsk/gskpath.c
View File

@@ -61,6 +61,11 @@ struct _GskContourClass
gpointer measure_data);
void (* copy) (const GskContour *contour,
GskContour *dest);
void (* add_segment) (const GskContour *contour,
GskPathBuilder *builder,
gpointer measure_data,
float start,
float end);
};
struct _GskPath
@@ -164,6 +169,71 @@ gsk_rect_contour_copy (const GskContour *contour,
*target = *self;
}
static void
gsk_rect_contour_add_segment (const GskContour *contour,
GskPathBuilder *builder,
gpointer measure_data,
float start,
float end)
{
const GskRectContour *self = (const GskRectContour *) contour;
float w = ABS (self->width);
float h = ABS (self->height);
if (start < w)
{
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);
return;
}
gsk_path_builder_line_to (builder, self->x + self->width, self->y);
}
start -= w;
end -= w;
if (start < h)
{
if (start >= 0)
gsk_path_builder_move_to (builder, self->x + self->width, self->y + start * (h / self->height));
if (end <= h)
{
gsk_path_builder_line_to (builder, self->x + self->width, self->y + end * (h / self->height));
return;
}
gsk_path_builder_line_to (builder, self->x + self->width, self->y + self->height);
}
start -= h;
end -= h;
if (start < w)
{
if (start >= 0)
gsk_path_builder_move_to (builder, self->x + (w - start) * (w / self->width), self->y + self->height);
if (end <= w)
{
gsk_path_builder_line_to (builder, self->x + (w - end) * (w / self->width), self->y + self->height);
return;
}
gsk_path_builder_line_to (builder, self->x, self->y + self->height);
}
start -= w;
end -= w;
if (start < h)
{
if (start >= 0)
gsk_path_builder_move_to (builder, self->x, self->y + (h - start) * (h / self->height));
if (end <= h)
{
gsk_path_builder_line_to (builder, self->x, self->y + (h - end) * (h / self->height));
return;
}
gsk_path_builder_line_to (builder, self->x, self->y);
}
}
static const GskContourClass GSK_RECT_CONTOUR_CLASS =
{
sizeof (GskRectContour),
@@ -174,7 +244,8 @@ static const GskContourClass GSK_RECT_CONTOUR_CLASS =
gsk_rect_contour_get_bounds,
gsk_rect_contour_init_measure,
gsk_rect_contour_free_measure,
gsk_rect_contour_copy
gsk_rect_contour_copy,
gsk_rect_contour_add_segment
};
static void
@@ -424,6 +495,102 @@ gsk_standard_contour_copy (const GskContour *contour,
gsk_standard_contour_init (dest, self->ops, self->n_ops, self->points, self->n_points);
}
static void
gsk_standard_contour_add_segment (const GskContour *contour,
GskPathBuilder *builder,
gpointer measure_data,
float start,
float end)
{
GskStandardContour *self = (GskStandardContour *) contour;
gsize i;
float length;
for (i = 0; end > 0 && i < self->n_ops; i ++)
{
graphene_point_t *pt = &self->points[self->ops[i].point];
switch (self->ops[i].op)
{
case GSK_PATH_MOVE:
if (start <= 0.0)
{
gsk_path_builder_move_to (builder, pt[0].x, pt[0].y);
start = -1;
}
break;
case GSK_PATH_CLOSE:
case GSK_PATH_LINE:
length = graphene_point_distance (&pt[0], &pt[1], NULL, NULL);
if (length <= start)
{
start -= length;
end -= length;
}
else
{
if (start >= 0)
{
graphene_point_t start_pt;
graphene_point_interpolate (&pt[0], &pt[1], start / length, &start_pt);
gsk_path_builder_move_to (builder, start_pt.x, start_pt.y);
start = -1;
}
if (length <= end)
{
gsk_path_builder_line_to (builder, pt[1].x, pt[1].y);
end -= length;
}
else
{
graphene_point_t end_pt;
graphene_point_interpolate (&pt[0], &pt[1], end / length, &end_pt);
gsk_path_builder_line_to (builder, end_pt.x, end_pt.y);
return;
}
}
break;
case GSK_PATH_CURVE:
g_warning ("i'm not fat!");
length = graphene_point_distance (&pt[0], &pt[3], NULL, NULL);
if (length <= start)
{
start -= length;
end -= length;
}
else
{
if (start >= 0)
{
graphene_point_t start_pt;
graphene_point_interpolate (&pt[0], &pt[3], start / length, &start_pt);
gsk_path_builder_move_to (builder, start_pt.x, start_pt.y);
start = -1;
}
if (length <= end)
{
gsk_path_builder_line_to (builder, pt[3].x, pt[3].y);
end -= length;
}
else
{
graphene_point_t end_pt;
graphene_point_interpolate (&pt[0], &pt[3], end / length, &end_pt);
gsk_path_builder_line_to (builder, end_pt.x, end_pt.y);
return;
}
}
break;
default:
g_assert_not_reached();
return;
}
}
}
static const GskContourClass GSK_STANDARD_CONTOUR_CLASS =
{
sizeof (GskStandardContour),
@@ -434,7 +601,8 @@ static const GskContourClass GSK_STANDARD_CONTOUR_CLASS =
gsk_standard_contour_get_bounds,
gsk_standard_contour_init_measure,
gsk_standard_contour_free_measure,
gsk_standard_contour_copy
gsk_standard_contour_copy,
gsk_standard_contour_add_segment
};
/* You must ensure the contour has enough size allocated,
@@ -849,6 +1017,19 @@ gsk_path_builder_add_contour (GskPathBuilder *builder,
builder->contours = g_slist_prepend (builder->contours, copy);
}
void
gsk_path_builder_add_contour_segment (GskPathBuilder *builder,
GskPath *path,
gsize i,
gpointer measure_data,
float start,
float end)
{
const GskContour *self = path->contours[i];
self->klass->add_segment (self, builder, measure_data, start, end);
}
/**
* gsk_path_builder_new:
*

59
gsk/gskpathmeasure.c
View File

@@ -161,3 +161,62 @@ gsk_path_measure_get_length (GskPathMeasure *self)
return self->length;
}
/**
* gsk_path_measure_add_segment:
* @self: a #GskPathMeasure
* @builder: the builder to add the segment to
* @start: start distance into the path
* @end: end distance into the path
*
* Adds to @builder the segment of @path inbetween @start and @end.
*
* The distances are given relative to the length of @self's path,
* from 0 for the begginning of the path to
* gsk_path_measure_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.
**/
void
gsk_path_measure_add_segment (GskPathMeasure *self,
GskPathBuilder *builder,
float start,
float end)
{
gsize i;
g_return_if_fail (self != NULL);
g_return_if_fail (builder != NULL);
start = CLAMP (start, 0, self->length);
end = CLAMP (end, 0, self->length);
if (start >= end)
return;
for (i = 0; i < self->n_contours; i++)
{
if (self->measures[i].length < start)
{
start -= self->measures[i].length;
end -= self->measures[i].length;
}
else if (start > 0 || end < self->measures[i].length)
{
float len = MIN (end, self->measures[i].length);
gsk_path_builder_add_contour_segment (builder,
self->path,
i,
self->measures[i].contour_data,
start,
len);
start = 0;
end -= len;
}
else
{
end -= self->measures[i].length;
gsk_path_builder_add_contour (builder, self->path, i);
}
}
}

7
gsk/gskpathmeasure.h
View File

@@ -25,7 +25,7 @@
#endif
#include <gsk/gsktypes.h>
#include <gsk/gskpath.h>
G_BEGIN_DECLS
@@ -44,6 +44,11 @@ void gsk_path_measure_unref (GskPathMeasure
GDK_AVAILABLE_IN_ALL
float gsk_path_measure_get_length (GskPathMeasure *self);
GDK_AVAILABLE_IN_ALL
void gsk_path_measure_add_segment (GskPathMeasure *self,
GskPathBuilder *builder,
float start,
float end);
G_END_DECLS
#endif /* __GSK_PATH_MEASURE_H__ */

6
gsk/gskpathprivate.h
View File

@@ -37,6 +37,12 @@ void gsk_contour_free_measure (GskPath
void gsk_path_builder_add_contour (GskPathBuilder *builder,
GskPath *path,
gsize i);
void gsk_path_builder_add_contour_segment (GskPathBuilder *builder,
GskPath *path,
gsize i,
gpointer measure_data,
float start,
float end);
G_END_DECLS