void
graphene_matrix_project_rect_bounds (const graphene_matrix_t *m,
const graphene_rect_t *r,
graphene_rect_t *res)
{
graphene_point_t points[4];
graphene_point_t ret[4];
float min_x, min_y;
float max_x, max_y;
int i;
graphene_rect_get_top_left (r, &points[0]);
graphene_rect_get_top_right (r, &points[1]);
graphene_rect_get_bottom_left (r, &points[2]);
graphene_rect_get_bottom_right (r, &points[3]);
graphene_matrix_project_point (m, &points[0], &ret[0]);
graphene_matrix_project_point (m, &points[1], &ret[1]);
graphene_matrix_project_point (m, &points[2], &ret[2]);
graphene_matrix_project_point (m, &points[3], &ret[3]);
min_x = max_x = ret[0].x;
min_y = max_y = ret[0].y;
for (i = 1; i < 4; i++)
{
min_x = MIN (ret[i].x, min_x);
min_y = MIN (ret[i].y, min_y);
max_x = MAX (ret[i].x, max_x);
max_y = MAX (ret[i].y, max_y);
}
graphene_rect_init (res, min_x, min_y, max_x - min_x, max_y - min_y);
}
/**
* graphene_matrix_transform_rect:
* @m: a #graphene_matrix_t
* @r: a #graphene_rect_t
* @res: (out caller-allocates): return location for the
* transformed quad
*
* Transforms a #graphene_rect_t using the given matrix @m. The
* result is a coplanar quad.
*
* Since: 1.0
*/
void
graphene_matrix_transform_rect (const graphene_matrix_t *m,
const graphene_rect_t *r,
graphene_quad_t *res)
{
graphene_point_t points[4];
graphene_point_t ret[4];
graphene_rect_get_top_left (r, &points[0]);
graphene_rect_get_top_right (r, &points[1]);
graphene_rect_get_bottom_right (r, &points[2]);
graphene_rect_get_bottom_left (r, &points[3]);
graphene_matrix_transform_point (m, &points[0], &ret[0]);
graphene_matrix_transform_point (m, &points[1], &ret[1]);
graphene_matrix_transform_point (m, &points[2], &ret[2]);
graphene_matrix_transform_point (m, &points[3], &ret[3]);
graphene_quad_init (res, &ret[0], &ret[1], &ret[2], &ret[3]);
}