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// Copyright 2017 The Servo Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
pub use sys::CGPathRef as SysCGPathRef;
use core_foundation::base::{CFRelease, CFRetain, CFTypeID};
use foreign_types::ForeignType;
use geometry::{CGAffineTransform, CGPoint, CGRect};
use libc::c_void;
use std::fmt::{self, Debug, Formatter};
use std::marker::PhantomData;
use std::ops::Deref;
use std::ptr;
use std::slice;
foreign_type! {
#[doc(hidden)]
pub unsafe type CGPath {
type CType = ::sys::CGPath;
fn drop = |p| CFRelease(p as *mut _);
fn clone = |p| CFRetain(p as *const _) as *mut _;
}
}
impl CGPath {
pub fn from_rect(rect: CGRect, transform: Option<&CGAffineTransform>) -> CGPath {
unsafe {
let transform = match transform {
None => ptr::null(),
Some(transform) => transform as *const CGAffineTransform,
};
CGPath::from_ptr(CGPathCreateWithRect(rect, transform))
}
}
pub fn type_id() -> CFTypeID {
unsafe {
CGPathGetTypeID()
}
}
pub fn apply<'a, F>(&'a self, mut closure: &'a F) where F: FnMut(CGPathElementRef<'a>) {
unsafe {
CGPathApply(self.as_ptr(), &mut closure as *mut _ as *mut c_void, do_apply::<F>);
}
unsafe extern "C" fn do_apply<'a, F>(info: *mut c_void, element: *const CGPathElement)
where F: FnMut(CGPathElementRef<'a>) {
let closure = info as *mut *mut F;
(**closure)(CGPathElementRef::new(element))
}
}
}
#[repr(i32)]
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum CGPathElementType {
MoveToPoint = 0,
AddLineToPoint = 1,
AddQuadCurveToPoint = 2,
AddCurveToPoint = 3,
CloseSubpath = 4,
}
pub struct CGPathElementRef<'a> {
element: *const CGPathElement,
phantom: PhantomData<&'a CGPathElement>,
}
impl<'a> CGPathElementRef<'a> {
fn new<'b>(element: *const CGPathElement) -> CGPathElementRef<'b> {
CGPathElementRef {
element: element,
phantom: PhantomData,
}
}
}
impl<'a> Deref for CGPathElementRef<'a> {
type Target = CGPathElement;
fn deref(&self) -> &CGPathElement {
unsafe {
&*self.element
}
}
}
#[repr(C)]
pub struct CGPathElement {
pub element_type: CGPathElementType,
points: *mut CGPoint,
}
impl Debug for CGPathElement {
fn fmt(&self, formatter: &mut Formatter) -> Result<(), fmt::Error> {
write!(formatter, "{:?}: {:?}", self.element_type, self.points())
}
}
impl CGPathElement {
pub fn points(&self) -> &[CGPoint] {
unsafe {
match self.element_type {
CGPathElementType::CloseSubpath => &[],
CGPathElementType::MoveToPoint | CGPathElementType::AddLineToPoint => {
slice::from_raw_parts(self.points, 1)
}
CGPathElementType::AddQuadCurveToPoint => slice::from_raw_parts(self.points, 2),
CGPathElementType::AddCurveToPoint => slice::from_raw_parts(self.points, 3),
}
}
}
}
type CGPathApplierFunction = unsafe extern "C" fn(info: *mut c_void,
element: *const CGPathElement);
#[link(name = "CoreGraphics", kind = "framework")]
extern {
fn CGPathCreateWithRect(rect: CGRect, transform: *const CGAffineTransform) -> ::sys::CGPathRef;
fn CGPathApply(path: ::sys::CGPathRef, info: *mut c_void, function: CGPathApplierFunction);
fn CGPathGetTypeID() -> CFTypeID;
}