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use std::marker::PhantomData;
use std::mem;
use std::os::raw::{c_int, c_void};
use std::ptr;
use sys;
#[derive(Clone, Eq, PartialEq, Hash, Debug)]
enum FontGlyphRangeData {
Chinese,
Cyrillic,
Default,
Japanese,
Korean,
Thai,
Custom(*const sys::ImWchar),
}
#[derive(Clone, Eq, PartialEq, Hash, Debug)]
pub struct FontGlyphRange(FontGlyphRangeData);
impl FontGlyphRange {
pub fn default() -> FontGlyphRange {
FontGlyphRange(FontGlyphRangeData::Default)
}
pub fn chinese() -> FontGlyphRange {
FontGlyphRange(FontGlyphRangeData::Chinese)
}
pub fn cyrillic() -> FontGlyphRange {
FontGlyphRange(FontGlyphRangeData::Cyrillic)
}
pub fn japanese() -> FontGlyphRange {
FontGlyphRange(FontGlyphRangeData::Japanese)
}
pub fn korean() -> FontGlyphRange {
FontGlyphRange(FontGlyphRangeData::Korean)
}
pub fn thai() -> FontGlyphRange {
FontGlyphRange(FontGlyphRangeData::Thai)
}
pub fn from_slice(slice: &'static [sys::ImWchar]) -> FontGlyphRange {
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 { FontGlyphRange::from_slice_unchecked(slice) }
}
pub unsafe fn from_slice_unchecked(slice: &'static [sys::ImWchar]) -> FontGlyphRange {
FontGlyphRange::from_ptr(slice.as_ptr())
}
pub unsafe fn from_ptr(ptr: *const sys::ImWchar) -> FontGlyphRange {
FontGlyphRange(FontGlyphRangeData::Custom(ptr))
}
unsafe fn to_ptr(&self, atlas: *mut sys::ImFontAtlas) -> *const sys::ImWchar {
match &self.0 {
&FontGlyphRangeData::Chinese => sys::ImFontAtlas_GetGlyphRangesChinese(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::Custom(ptr) => ptr,
}
}
}
#[derive(Copy, Clone, PartialEq, Debug)]
pub struct ImFontConfig {
size_pixels: f32,
oversample_h: u32,
oversample_v: u32,
pixel_snap_h: bool,
glyph_extra_spacing: sys::ImVec2,
glyph_offset: sys::ImVec2,
merge_mode: bool,
rasterizer_multiply: f32,
}
impl ImFontConfig {
pub fn new() -> ImFontConfig {
ImFontConfig {
size_pixels: 0.0,
oversample_h: 3,
oversample_v: 1,
pixel_snap_h: false,
glyph_extra_spacing: sys::ImVec2::zero(),
glyph_offset: sys::ImVec2::zero(),
merge_mode: false,
rasterizer_multiply: 1.0,
}
}
pub fn size_pixels(mut self, size_pixels: f32) -> ImFontConfig {
self.size_pixels = size_pixels;
self
}
pub fn oversample_h(mut self, oversample_h: u32) -> ImFontConfig {
self.oversample_h = oversample_h;
self
}
pub fn oversample_v(mut self, oversample_v: u32) -> ImFontConfig {
self.oversample_v = oversample_v;
self
}
pub fn pixel_snap_h(mut self, pixel_snap_h: bool) -> ImFontConfig {
self.pixel_snap_h = pixel_snap_h;
self
}
pub fn glyph_extra_spacing<I: Into<sys::ImVec2>>(mut self, extra_spacing: I) -> ImFontConfig {
self.glyph_extra_spacing = extra_spacing.into();
self
}
pub fn glyph_offset<I: Into<sys::ImVec2>>(mut self, glyph_offset: I) -> ImFontConfig {
self.glyph_offset = glyph_offset.into();
self
}
pub fn merge_mode(mut self, merge_mode: bool) -> ImFontConfig {
self.merge_mode = merge_mode;
self
}
pub fn rasterizer_multiply(mut self, rasterizer_multiply: f32) -> ImFontConfig {
self.rasterizer_multiply = rasterizer_multiply;
self
}
fn make_config(self) -> sys::ImFontConfig {
let mut config = unsafe {
let mut config = mem::uninitialized();
sys::ImFontConfig_DefaultConstructor(&mut config);
config
};
config.size_pixels = self.size_pixels;
config.oversample_h = self.oversample_h as c_int;
config.oversample_v = self.oversample_v as c_int;
config.pixel_snap_h = self.pixel_snap_h;
config.glyph_extra_spacing = self.glyph_extra_spacing;
config.glyph_offset = self.glyph_offset;
config.merge_mode = self.merge_mode;
config.rasterizer_multiply = self.rasterizer_multiply;
config
}
pub fn add_font<'a>(
self,
atlas: &'a mut ImFontAtlas<'a>,
data: &[u8],
range: &FontGlyphRange,
) -> ImFont<'a> {
atlas.add_font_with_config(data, self, range)
}
pub fn add_default_font<'a>(self, atlas: &'a mut ImFontAtlas<'a>) -> ImFont<'a> {
atlas.add_default_font_with_config(self)
}
}
impl Default for ImFontConfig {
fn default() -> Self {
ImFontConfig::new()
}
}
pub struct ImFont<'a> {
font: *mut sys::ImFont,
_phantom: PhantomData<&'a mut sys::ImFont>,
}
impl<'a> ImFont<'a> {
unsafe fn from_ptr(font: *mut sys::ImFont) -> ImFont<'a> {
ImFont {
font,
_phantom: PhantomData,
}
}
fn chain(&mut self) -> ImFont {
ImFont {
font: self.font,
_phantom: PhantomData,
}
}
pub fn font_size(&self) -> f32 {
unsafe { sys::ImFont_GetFontSize(self.font) }
}
pub fn set_font_size(&mut self, size: f32) -> ImFont {
unsafe { sys::ImFont_SetFontSize(self.font, size) }
self.chain()
}
pub fn scale(&self) -> f32 {
unsafe { sys::ImFont_GetScale(self.font) }
}
pub fn set_scale(&mut self, size: f32) -> ImFont {
unsafe { sys::ImFont_SetScale(self.font, size) }
self.chain()
}
pub fn display_offset(&self) -> (f32, f32) {
let mut display_offset = unsafe { mem::uninitialized() };
unsafe { sys::ImFont_GetDisplayOffset(self.font, &mut display_offset) }
display_offset.into()
}
}
#[repr(C)]
pub struct ImFontAtlas<'a> {
atlas: *mut sys::ImFontAtlas,
_phantom: PhantomData<&'a mut sys::ImFontAtlas>,
}
impl<'a> ImFontAtlas<'a> {
pub(crate) unsafe fn from_ptr(atlas: *mut sys::ImFontAtlas) -> ImFontAtlas<'a> {
ImFontAtlas {
atlas,
_phantom: PhantomData,
}
}
pub fn add_default_font(&mut self) -> ImFont {
unsafe { ImFont::from_ptr(sys::ImFontAtlas_AddFontDefault(self.atlas, ptr::null_mut())) }
}
pub fn add_default_font_with_config(&mut self, config: ImFontConfig) -> ImFont {
let config = config.make_config();
unsafe { ImFont::from_ptr(sys::ImFontAtlas_AddFontDefault(self.atlas, &config)) }
}
fn raw_add_font(
&mut self,
data: &[u8],
config: ImFontConfig,
range: &FontGlyphRange,
) -> ImFont {
assert!(
(data.len() as u64) < (c_int::max_value() as u64),
"Font data is too long."
);
unsafe {
let mut config = config.make_config();
assert!(config.size_pixels > 0.0, "Font size cannot be zero.");
config.font_data = data.as_ptr() as *mut c_void;
config.font_data_size = data.len() as c_int;
config.glyph_ranges = range.to_ptr(self.atlas);
config.font_data_owned_by_atlas = false;
ImFont::from_ptr(sys::ImFontAtlas_AddFont(self.atlas, &config))
}
}
pub fn add_font(&mut self, data: &[u8], size: f32, range: &FontGlyphRange) -> ImFont {
self.raw_add_font(data, ImFontConfig::new().size_pixels(size), range)
}
pub fn add_font_with_config(
&mut self,
data: &[u8],
config: ImFontConfig,
range: &FontGlyphRange,
) -> ImFont {
self.raw_add_font(data, config, range)
}
pub fn font_count(&self) -> usize {
unsafe { sys::ImFontAtlas_Fonts_size(self.atlas) as usize }
}
pub fn index_font(&mut self, index: usize) -> ImFont {
assert!(index < self.font_count(), "Font index is out of range.");
unsafe { ImFont::from_ptr(sys::ImFontAtlas_Fonts_index(self.atlas, index as c_int)) }
}
pub fn clear(&mut self) {
unsafe { sys::ImFontAtlas_Clear(self.atlas) }
}
pub fn texture_id(&self) -> usize {
unsafe { (*self.atlas).tex_id as usize }
}
pub fn set_texture_id(&mut self, value: usize) {
unsafe {
(*self.atlas).tex_id = value as *mut c_void;
}
}
}