/**
* _cairo_path_fixed_transform:
* @path: a #cairo_path_fixed_t to be transformed
* @matrix: a #cairo_matrix_t
*
* Transform the fixed-point path according to the given matrix.
* There is a fast path for the case where @matrix has no rotation
* or shear.
**/
void
_cairo_path_fixed_transform (cairo_path_fixed_t *path,
cairo_matrix_t *matrix)
{
cairo_path_buf_t *buf;
int i;
double dx, dy;
if (matrix->yx == 0.0 && matrix->xy == 0.0) {
/* Fast path for the common case of scale+transform */
_cairo_path_fixed_offset_and_scale (path,
_cairo_fixed_from_double (matrix->x0),
_cairo_fixed_from_double (matrix->y0),
_cairo_fixed_from_double (matrix->xx),
_cairo_fixed_from_double (matrix->yy));
return;
}
buf = &path->buf_head.base;
while (buf) {
for (i = 0; i < buf->num_points; i++) {
dx = _cairo_fixed_to_double (buf->points[i].x);
dy = _cairo_fixed_to_double (buf->points[i].y);
cairo_matrix_transform_point (matrix, &dx, &dy);
buf->points[i].x = _cairo_fixed_from_double (dx);
buf->points[i].y = _cairo_fixed_from_double (dy);
}
buf = buf->next;
}
}
/**
* _cairo_path_fixed_device_transform:
* @path: a #cairo_path_fixed_t to be transformed
* @device_transform: a matrix with only scaling/translation (no rotation or shear)
*
* Transform the fixed-point path according to the scaling and
* translation of the given matrix. This function assert()s that the
* given matrix has no rotation or shear elements, (that is, xy and yx
* are 0.0).
**/
void
_cairo_path_fixed_device_transform (cairo_path_fixed_t *path,
cairo_matrix_t *device_transform)
{
assert (device_transform->yx == 0.0 && device_transform->xy == 0.0);
/* XXX: Support freeform matrices someday (right now, only translation and scale
* work. */
_cairo_path_fixed_offset_and_scale (path,
_cairo_fixed_from_double (device_transform->x0),
_cairo_fixed_from_double (device_transform->y0),
_cairo_fixed_from_double (device_transform->xx),
_cairo_fixed_from_double (device_transform->yy));
}
/**
* _cairo_path_fixed_device_transform:
* @path: a #cairo_path_fixed_t to be transformed
* @device_transform: a matrix with only scaling/translation (no rotation or shear)
*
* Transform the fixed-point path according to the scaling and
* translation of the given matrix. This function assert()s that the
* given matrix has no rotation or shear elements, (that is, xy and yx
* are 0.0).
**/
void
_cairo_path_fixed_device_transform (cairo_path_fixed_t *path,
cairo_matrix_t *device_transform)
{
assert (device_transform->yx == 0.0 && device_transform->xy == 0.0);
/* XXX: FRAGILE: I'm not really sure whether we're doing the
* "right" thing here if there is both scaling and translation in
* the matrix. But for now, the internals guarantee that we won't
* really ever have both going on. */
_cairo_path_fixed_offset_and_scale (path,
_cairo_fixed_from_double (device_transform->x0),
_cairo_fixed_from_double (device_transform->y0),
_cairo_fixed_from_double (device_transform->xx),
_cairo_fixed_from_double (device_transform->yy));
}
