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GskTransform: Add gsk_transform_transform_point()

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Equivalent of gsk_transform_transform_bounds() and
graphene_matrix_transform_point() respectively.
This commit is contained in:
Timm Bäder 2020-01-21 09:41:54 +01:00
parent 962e38c5c9
commit cff8304133
3 changed files with 62 additions and 0 deletions
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1
docs/reference/gsk/gsk4-sections.txt
View File

@ -183,6 +183,7 @@ gsk_transform_perspective
gsk_transform_equal gsk_transform_equal
<SUBSECTION> <SUBSECTION>
gsk_transform_transform_bounds gsk_transform_transform_bounds
gsk_transform_transform_point
<SUBSECTION Private> <SUBSECTION Private>
GSK_TYPE_TRANSFORM GSK_TYPE_TRANSFORM
gsk_transform_get_type gsk_transform_get_type

56
gsk/gsktransform.c
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@ -1773,6 +1773,62 @@ gsk_transform_transform_bounds (GskTransform *self,
} }
} }
/**
* gsk_transform_transform_point:
* @self: a #GskTransform
* @point: a #graphene_point_t
* @out_point: (out caller-allocates): return location for
* the transformed point
*
* Transforms a #graphene_point_t using the given transform @self.
*/
void
gsk_transform_transform_point (GskTransform *self,
const graphene_point_t *point,
graphene_point_t *out_point)
{
switch (gsk_transform_get_category (self))
{
case GSK_TRANSFORM_CATEGORY_IDENTITY:
*out_point = *point;
break;
case GSK_TRANSFORM_CATEGORY_2D_TRANSLATE:
{
float dx, dy;
gsk_transform_to_translate (self, &dx, &dy);
out_point->x = point->x + dx;
out_point->y = point->y + dy;
}
break;
case GSK_TRANSFORM_CATEGORY_2D_AFFINE:
{
float dx, dy, scale_x, scale_y;
gsk_transform_to_affine (self, &scale_x, &scale_y, &dx, &dy);
out_point->x = (point->x * scale_x) + dx;
out_point->y = (point->y * scale_y) + dy;
}
break;
case GSK_TRANSFORM_CATEGORY_UNKNOWN:
case GSK_TRANSFORM_CATEGORY_ANY:
case GSK_TRANSFORM_CATEGORY_3D:
case GSK_TRANSFORM_CATEGORY_2D:
default:
{
graphene_matrix_t mat;
gsk_transform_to_matrix (self, &mat);
graphene_matrix_transform_point (&mat, point, out_point);
}
break;
}
}
static guint static guint
gsk_transform_parse_float (GtkCssParser *parser, gsk_transform_parse_float (GtkCssParser *parser,
guint n, guint n,

5
gsk/gsktransform.h
View File

@ -116,6 +116,11 @@ GDK_AVAILABLE_IN_ALL
void gsk_transform_transform_bounds (GskTransform *self, void gsk_transform_transform_bounds (GskTransform *self,
const graphene_rect_t *rect, const graphene_rect_t *rect,
graphene_rect_t *out_rect); graphene_rect_t *out_rect);
GDK_AVAILABLE_IN_ALL
void gsk_transform_transform_point (GskTransform *self,
const graphene_point_t *point,
graphene_point_t *out_point);
G_END_DECLS G_END_DECLS