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cd2ab36759
This crate only takes care of fonts now as graphics related things are split into other crates. In addition, this exposes data structures at the top of the crate, hiding the implementation details and making it simpler to import them. Signed-off-by: Martin Robinson <mrobinson@igalia.com> Co-authored-by: Mukilan Thiyagarajan <mukilan@igalia.com>
89 lines
2.9 KiB
Rust
89 lines
2.9 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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#![deny(unsafe_code)]
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mod font;
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mod font_cache_thread;
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mod font_context;
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mod font_store;
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mod font_template;
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mod glyph;
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#[allow(unsafe_code)]
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pub mod platform;
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mod shaper;
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pub use font::*;
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pub use font_cache_thread::*;
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pub use font_context::*;
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pub use font_store::*;
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pub use font_template::*;
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pub use glyph::*;
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pub use shaper::*;
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use unicode_properties::{emoji, EmojiStatus, UnicodeEmoji};
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/// Whether or not font fallback selection prefers the emoji or text representation
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/// of a character. If `None` then either presentation is acceptable.
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#[derive(Clone, Copy, Debug, PartialEq)]
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pub enum EmojiPresentationPreference {
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None,
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Text,
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Emoji,
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}
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#[derive(Clone, Copy, Debug)]
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pub struct FallbackFontSelectionOptions {
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pub character: char,
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pub presentation_preference: EmojiPresentationPreference,
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}
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impl Default for FallbackFontSelectionOptions {
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fn default() -> Self {
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Self {
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character: ' ',
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presentation_preference: EmojiPresentationPreference::None,
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}
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}
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}
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impl FallbackFontSelectionOptions {
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pub fn new(character: char, next_character: Option<char>) -> Self {
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let presentation_preference = match next_character {
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Some(next_character) if emoji::is_emoji_presentation_selector(next_character) => {
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EmojiPresentationPreference::Emoji
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},
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Some(next_character) if emoji::is_text_presentation_selector(next_character) => {
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EmojiPresentationPreference::Text
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},
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// We don't want to select emoji prsentation for any possible character that might be an emoji, because
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// that includes characters such as '0' that are also used outside of emoji clusters. Instead, only
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// select the emoji font for characters that explicitly have an emoji presentation (in the absence
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// of the emoji presentation selectors above).
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_ if matches!(
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character.emoji_status(),
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EmojiStatus::EmojiPresentation |
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EmojiStatus::EmojiPresentationAndModifierBase |
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EmojiStatus::EmojiPresentationAndEmojiComponent |
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EmojiStatus::EmojiPresentationAndModifierAndEmojiComponent
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) =>
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{
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EmojiPresentationPreference::Emoji
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},
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_ if character.is_emoji_char() => EmojiPresentationPreference::Text,
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_ => EmojiPresentationPreference::None,
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};
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Self {
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character,
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presentation_preference,
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}
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}
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}
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pub(crate) fn float_to_fixed(before: usize, f: f64) -> i32 {
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((1i32 << before) as f64 * f) as i32
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}
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pub(crate) fn fixed_to_float(before: usize, f: i32) -> f64 {
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f as f64 * 1.0f64 / ((1i32 << before) as f64)
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}
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