Revision control
Copy as Markdown
Other Tools
// Copyright 2013 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.
use core_foundation::array::{CFArray, CFArrayRef};
use core_foundation::attributed_string::CFAttributedStringRef;
use core_foundation::base::{CFIndex, CFRange, CFTypeID, TCFType};
use core_graphics::base::CGFloat;
use core_graphics::context::CGContext;
use core_graphics::geometry::{CGPoint, CGRect};
use foreign_types::ForeignType;
use run::CTRun;
use std::os::raw::c_void;
#[repr(C)]
pub struct __CTLine(c_void);
pub type CTLineRef = *const __CTLine;
declare_TCFType! {
CTLine, CTLineRef
}
impl_TCFType!(CTLine, CTLineRef, CTLineGetTypeID);
impl_CFTypeDescription!(CTLine);
/// Metrics for a given line.
pub struct TypographicBounds {
pub width: CGFloat,
pub ascent: CGFloat,
pub descent: CGFloat,
pub leading: CGFloat,
}
impl CTLine {
pub fn new_with_attributed_string(string: CFAttributedStringRef) -> Self {
unsafe {
let ptr = CTLineCreateWithAttributedString(string);
CTLine::wrap_under_create_rule(ptr)
}
}
pub fn glyph_runs(&self) -> CFArray<CTRun> {
unsafe { TCFType::wrap_under_get_rule(CTLineGetGlyphRuns(self.0)) }
}
pub fn get_string_range(&self) -> CFRange {
unsafe { CTLineGetStringRange(self.as_concrete_TypeRef()) }
}
pub fn draw(&self, context: &CGContext) {
unsafe { CTLineDraw(self.as_concrete_TypeRef(), context.as_ptr()) }
}
pub fn get_image_bounds(&self, context: &CGContext) -> CGRect {
unsafe { CTLineGetImageBounds(self.as_concrete_TypeRef(), context.as_ptr()) }
}
pub fn get_typographic_bounds(&self) -> TypographicBounds {
let mut ascent = 0.0;
let mut descent = 0.0;
let mut leading = 0.0;
unsafe {
let width = CTLineGetTypographicBounds(
self.as_concrete_TypeRef(),
&mut ascent,
&mut descent,
&mut leading,
);
TypographicBounds {
width,
ascent,
descent,
leading,
}
}
}
pub fn get_string_index_for_position(&self, position: CGPoint) -> CFIndex {
unsafe { CTLineGetStringIndexForPosition(self.as_concrete_TypeRef(), position) }
}
pub fn get_string_offset_for_string_index(&self, charIndex: CFIndex) -> CGFloat {
unsafe {
CTLineGetOffsetForStringIndex(self.as_concrete_TypeRef(), charIndex, std::ptr::null())
}
}
}
#[link(name = "CoreText", kind = "framework")]
extern "C" {
fn CTLineGetTypeID() -> CFTypeID;
fn CTLineGetGlyphRuns(line: CTLineRef) -> CFArrayRef;
fn CTLineGetStringRange(line: CTLineRef) -> CFRange;
// Creating Lines
fn CTLineCreateWithAttributedString(string: CFAttributedStringRef) -> CTLineRef;
// Drawing the Line
fn CTLineDraw(line: CTLineRef, context: *const core_graphics::sys::CGContext);
// Measuring Lines
fn CTLineGetImageBounds(
line: CTLineRef,
context: *const core_graphics::sys::CGContext,
) -> CGRect;
fn CTLineGetTypographicBounds(
line: CTLineRef,
ascent: *mut CGFloat,
descent: *mut CGFloat,
leading: *mut CGFloat,
) -> CGFloat;
// Getting Line Positioning
fn CTLineGetStringIndexForPosition(line: CTLineRef, position: CGPoint) -> CFIndex;
fn CTLineGetOffsetForStringIndex(
line: CTLineRef,
charIndex: CFIndex,
secondaryOffset: *const CGFloat,
) -> CGFloat;
}