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[path-fixed] add _cairo_path_fixed_interpret_flat

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_cairo_path_fixed_interpret_flat flattens the path as it
interprets it, meaning that a curve_to callback is not
required.
This commit is contained in:
Brian Ewins 2008-01-19 22:31:10 +00:00 • committed by Carl Worth
parent 3339c32b0a
commit 1471b3f00a
2 changed files with 108 additions and 0 deletions
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99
src/cairo-path-fixed.c
View file

@ -622,3 +622,102 @@ _cairo_path_fixed_is_equal (cairo_path_fixed_t *path,
}
return TRUE;
}
/* Closure for path flattening */
typedef struct cairo_path_flattener {
double tolerance;
cairo_point_t current_point;
cairo_path_fixed_move_to_func_t *move_to;
cairo_path_fixed_line_to_func_t *line_to;
cairo_path_fixed_close_path_func_t *close_path;
void *closure;
} cpf_t;
static cairo_status_t
_cpf_move_to (void *closure, cairo_point_t *point)
{
cpf_t *cpf = closure;
cpf->current_point = *point;
return cpf->move_to (cpf->closure, point);
}
static cairo_status_t
_cpf_line_to (void *closure, cairo_point_t *point)
{
cpf_t *cpf = closure;
cpf->current_point = *point;
return cpf->line_to (cpf->closure, point);
}
static cairo_status_t
_cpf_curve_to (void *closure,
cairo_point_t *p1,
cairo_point_t *p2,
cairo_point_t *p3)
{
cpf_t *cpf = closure;
cairo_status_t status;
cairo_spline_t spline;
int i;
cairo_point_t *p0 = &cpf->current_point;
status = _cairo_spline_init (&spline, p0, p1, p2, p3);
if (status == CAIRO_INT_STATUS_DEGENERATE)
return CAIRO_STATUS_SUCCESS;
status = _cairo_spline_decompose (&spline, cpf->tolerance);
if (status)
goto out;
for (i=1; i < spline.num_points; i++) {
status = cpf->line_to (cpf->closure, &spline.points[i]);
if (status)
goto out;
}
cpf->current_point = *p3;
status = CAIRO_STATUS_SUCCESS;
out:
_cairo_spline_fini (&spline);
return status;
}
static cairo_status_t
_cpf_close_path (void *closure)
{
cpf_t *cpf = closure;
return cpf->close_path (cpf->closure);
}
cairo_status_t
_cairo_path_fixed_interpret_flat (cairo_path_fixed_t *path,
cairo_direction_t dir,
cairo_path_fixed_move_to_func_t *move_to,
cairo_path_fixed_line_to_func_t *line_to,
cairo_path_fixed_close_path_func_t *close_path,
void *closure,
double tolerance)
{
cpf_t flattener;
flattener.tolerance = tolerance;
flattener.move_to = move_to;
flattener.line_to = line_to;
flattener.close_path = close_path;
flattener.closure = closure;
return _cairo_path_fixed_interpret (path, dir,
_cpf_move_to,
_cpf_line_to,
_cpf_curve_to,
_cpf_close_path,
&flattener);
}

9
src/cairoint.h
View file

@ -1347,6 +1347,15 @@ _cairo_path_fixed_interpret (cairo_path_fixed_t *path,
cairo_path_fixed_close_path_func_t *close_path,
void *closure);
cairo_private cairo_status_t
_cairo_path_fixed_interpret_flat (cairo_path_fixed_t *path,
cairo_direction_t dir,
cairo_path_fixed_move_to_func_t *move_to,
cairo_path_fixed_line_to_func_t *line_to,
cairo_path_fixed_close_path_func_t *close_path,
void *closure,
double tolerance);
cairo_private void
_cairo_path_fixed_bounds (cairo_path_fixed_t *path,
double *x1, double *y1,