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| author | Timm Bäder <mail@baedert.org> | 2020-01-21 09:41:54 +0100 |
|---|---|---|
| committer | Timm Bäder <mail@baedert.org> | 2020-01-23 16:10:13 +0100 |
| commit | 0f43108e7745e08105ab7b11ade72eb6598b17af (patch) | |
| tree | cbd8f27005c7d082414779dd35078a4a26b59d6e | |
| parent | d6d5a7d8e03e3598c6534330570f893a8fb2055a (diff) | |
| download | gtk+-0f43108e7745e08105ab7b11ade72eb6598b17af.tar.gz | |
GskTransform: Add gsk_transform_transform_point()
Equivalent of gsk_transform_transform_bounds() and
graphene_matrix_transform_point() respectively.
| -rw-r--r-- | gsk/gsktransform.c | 56 | ||||
| -rw-r--r-- | gsk/gsktransform.h | 5 |
2 files changed, 61 insertions, 0 deletions
diff --git a/gsk/gsktransform.c b/gsk/gsktransform.c index 388dad5b45..5d9d538d4c 100644 --- a/gsk/gsktransform.c +++ b/gsk/gsktransform.c @@ -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 gsk_transform_parse_float (GtkCssParser *parser, guint n, diff --git a/gsk/gsktransform.h b/gsk/gsktransform.h index 56cafcc430..f3676bca63 100644 --- a/gsk/gsktransform.h +++ b/gsk/gsktransform.h @@ -116,6 +116,11 @@ GDK_AVAILABLE_IN_ALL void gsk_transform_transform_bounds (GskTransform *self, const graphene_rect_t *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 |