// Copyright © SixtyFPS GmbH <info@slint-ui.com>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial
use crate::slice::Slice;
#[repr(C)]
#[derive(Debug)]
/// A pre-rendered glyph with the alpha map and associated metrics
pub struct BitmapGlyph {
/// The starting x-coordinate for the glyph, relative to the base line
pub x: i16,
/// The starting y-coordinate for the glyph, relative to the base line
pub y: i16,
/// The width of the glyph in pixels
pub width: i16,
/// The height of the glyph in pixels
pub height: i16,
/// The horizontal distance to the next glyph
pub x_advance: i16,
/// The 8-bit alpha map that's to be blended with the current text color
pub data: Slice<'static, u8>,
}
#[repr(C)]
#[derive(Debug)]
/// A set of pre-rendered bitmap glyphs at a fixed pixel size
pub struct BitmapGlyphs {
/// The font size in pixels at which the glyphs were pre-rendered. The boundaries of glyphs may exceed this
/// size, if the font designer has chosen so. This is only used for matching.
pub pixel_size: i16,
/// The data of the pre-rendered glyphs
pub glyph_data: Slice<'static, BitmapGlyph>,
}
#[repr(C)]
#[derive(Debug)]
/// An entry in the character map of a [`BitmapFont`].
pub struct CharacterMapEntry {
/// The unicode code point for a given glyph
pub code_point: char,
/// The corresponding index in the `glyph_data` of [`BitmapGlyphs`]
pub glyph_index: u16,
}
#[repr(C)]
#[derive(Debug)]
/// A subset of an originally scalable font that's rendered ahead of time.
pub struct BitmapFont {
/// The family name of the font
pub family_name: Slice<'static, u8>,
/// A vector of code points and their corresponding glyph index, sorted by code point.
pub character_map: Slice<'static, CharacterMapEntry>,
/// The font supplied size of the em square.
pub units_per_em: f32,
/// The font ascent in design metrics (typically positive)
pub ascent: f32,
/// The font descent in design metrics (typically negative)
pub descent: f32,
/// A vector of pre-rendered glyph sets. Each glyph set must have the same number of glyphs,
/// which must be at least as big as the largest glyph index in the character map.
pub glyphs: Slice<'static, BitmapGlyphs>,
}