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use crate::sys;
#[derive(Clone, Eq, PartialEq, Debug)]
enum FontGlyphRangeData {
ChineseSimplifiedCommon,
ChineseFull,
Cyrillic,
Default,
Japanese,
Korean,
Thai,
Vietnamese,
Custom(*const sys::ImWchar),
}
/// A set of 16-bit Unicode codepoints
#[derive(Clone, Eq, PartialEq, Debug)]
pub struct FontGlyphRanges(FontGlyphRangeData);
impl FontGlyphRanges {
/// The default set of glyph ranges used by imgui.
pub fn default() -> FontGlyphRanges {
FontGlyphRanges(FontGlyphRangeData::Default)
}
/// A set of glyph ranges appropriate for use with simplified common Chinese text.
pub fn chinese_simplified_common() -> FontGlyphRanges {
FontGlyphRanges(FontGlyphRangeData::ChineseSimplifiedCommon)
}
/// A set of glyph ranges appropriate for use with Chinese text.
pub fn chinese_full() -> FontGlyphRanges {
FontGlyphRanges(FontGlyphRangeData::ChineseFull)
}
/// A set of glyph ranges appropriate for use with Cyrillic text.
pub fn cyrillic() -> FontGlyphRanges {
FontGlyphRanges(FontGlyphRangeData::Cyrillic)
}
/// A set of glyph ranges appropriate for use with Japanese text.
pub fn japanese() -> FontGlyphRanges {
FontGlyphRanges(FontGlyphRangeData::Japanese)
}
/// A set of glyph ranges appropriate for use with Korean text.
pub fn korean() -> FontGlyphRanges {
FontGlyphRanges(FontGlyphRangeData::Korean)
}
/// A set of glyph ranges appropriate for use with Thai text.
pub fn thai() -> FontGlyphRanges {
FontGlyphRanges(FontGlyphRangeData::Thai)
}
/// A set of glyph ranges appropriate for use with Vietnamese text.
pub fn vietnamese() -> FontGlyphRanges {
FontGlyphRanges(FontGlyphRangeData::Vietnamese)
}
/// Creates a glyph range from a static slice. The expected format is a series of pairs of
/// non-zero shorts, each representing an inclusive range of codepoints, followed by a single
/// zero terminating the range. The ranges must not overlap.
///
/// As the slice is expected to last as long as a font is used, and is written into global
/// state, it must be `'static`.
///
/// Panics
/// ======
///
/// This function will panic if the given slice is not a valid font range.
pub fn from_slice(slice: &'static [u16]) -> FontGlyphRanges {
assert_eq!(
slice.len() % 2,
1,
"The length of a glyph range must be odd."
);
assert_eq!(
slice.last(),
Some(&0),
"A glyph range must be zero-terminated."
);
for (i, &glyph) in slice.iter().enumerate().take(slice.len() - 1) {
assert_ne!(
glyph, 0,
"A glyph in a range cannot be zero. \
(Glyph is zero at index {})",
i
)
}
let mut ranges = Vec::new();
for i in 0..slice.len() / 2 {
let (start, end) = (slice[i * 2], slice[i * 2 + 1]);
assert!(
start <= end,
"The start of a range cannot be larger than its end. \
(At index {}, {} > {})",
i * 2,
start,
end
);
ranges.push((start, end));
}
ranges.sort_unstable_by_key(|x| x.0);
for i in 0..ranges.len() - 1 {
let (range_a, range_b) = (ranges[i], ranges[i + 1]);
if range_a.1 >= range_b.0 {
panic!(
"The glyph ranges {:?} and {:?} overlap between {:?}.",
range_a,
range_b,
(range_a.1, range_b.0)
);
}
}
unsafe { FontGlyphRanges::from_slice_unchecked(slice) }
}
/// Creates a glyph range from a static slice without checking its validity.
///
/// See [`FontRangeGlyph::from_slice`] for more information.
///
/// # Safety
///
/// It is up to the caller to guarantee the slice contents are valid.
pub unsafe fn from_slice_unchecked(slice: &'static [u16]) -> FontGlyphRanges {
FontGlyphRanges::from_ptr(slice.as_ptr())
}
/// Creates a glyph range from a pointer, without checking its validity or enforcing its
/// lifetime. The memory the pointer points to must be valid for as long as the font is
/// in use.
///
/// # Safety
///
/// It is up to the caller to guarantee the pointer is not null, remains valid forever, and
/// points to valid data.
pub unsafe fn from_ptr(ptr: *const u16) -> FontGlyphRanges {
FontGlyphRanges(FontGlyphRangeData::Custom(ptr))
}
pub(crate) unsafe fn to_ptr(&self, atlas: *mut sys::ImFontAtlas) -> *const sys::ImWchar {
match self.0 {
FontGlyphRangeData::ChineseFull => sys::ImFontAtlas_GetGlyphRangesChineseFull(atlas),
FontGlyphRangeData::ChineseSimplifiedCommon => {
sys::ImFontAtlas_GetGlyphRangesChineseSimplifiedCommon(atlas)
}
FontGlyphRangeData::Cyrillic => sys::ImFontAtlas_GetGlyphRangesCyrillic(atlas),
FontGlyphRangeData::Default => sys::ImFontAtlas_GetGlyphRangesDefault(atlas),
FontGlyphRangeData::Japanese => sys::ImFontAtlas_GetGlyphRangesJapanese(atlas),
FontGlyphRangeData::Korean => sys::ImFontAtlas_GetGlyphRangesKorean(atlas),
FontGlyphRangeData::Thai => sys::ImFontAtlas_GetGlyphRangesThai(atlas),
FontGlyphRangeData::Vietnamese => sys::ImFontAtlas_GetGlyphRangesVietnamese(atlas),
FontGlyphRangeData::Custom(ptr) => ptr,
}
}
}