mirror of
https://github.com/italicsjenga/vello.git
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782e7d51d2
Removes the dependency on the piet crate and replaces all uses with the scene crate. Also does some cleanup of the scene API, renaming some types and moving them all to the crate root for better ergonomics.
82 lines
2.9 KiB
Rust
82 lines
2.9 KiB
Rust
// Copyright 2022 The piet-gpu authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Also licensed under MIT license, at your choice.
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use piet_scene::glyph::{pinot, pinot::TableProvider, GlyphContext};
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use piet_scene::{Affine, Brush, SceneBuilder};
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pub use pinot::FontRef;
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// This is very much a hack to get things working.
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// On Windows, can set this to "c:\\Windows\\Fonts\\seguiemj.ttf" to get color emoji
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const FONT_DATA: &[u8] = include_bytes!("../third-party/Roboto-Regular.ttf");
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pub struct SimpleText {
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gcx: GlyphContext,
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}
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impl SimpleText {
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pub fn new() -> Self {
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Self {
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gcx: GlyphContext::new(),
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}
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}
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pub fn add(
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&mut self,
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builder: &mut SceneBuilder,
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font: Option<&FontRef>,
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size: f32,
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brush: Option<&Brush>,
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transform: Affine,
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text: &str,
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) {
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let font = font.unwrap_or(&FontRef {
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data: FONT_DATA,
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offset: 0,
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});
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if let Some(cmap) = font.cmap() {
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if let Some(hmtx) = font.hmtx() {
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let upem = font.head().map(|head| head.units_per_em()).unwrap_or(1000) as f32;
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let scale = size / upem;
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let vars: [(pinot::types::Tag, f32); 0] = [];
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let mut provider = self.gcx.new_provider(font, None, size, false, vars);
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let hmetrics = hmtx.hmetrics();
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let default_advance = hmetrics
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.get(hmetrics.len().saturating_sub(1))
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.map(|h| h.advance_width)
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.unwrap_or(0);
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let mut pen_x = 0f32;
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for ch in text.chars() {
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let gid = cmap.map(ch as u32).unwrap_or(0);
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let advance = hmetrics
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.get(gid as usize)
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.map(|h| h.advance_width)
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.unwrap_or(default_advance) as f32
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* scale;
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if let Some(glyph) = provider.get(gid, brush) {
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if !glyph.is_empty() {
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let xform = transform
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* Affine::translate(pen_x, 0.0)
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* Affine::scale(1.0, -1.0);
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builder.append(&glyph, Some(xform));
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}
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}
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pen_x += advance;
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}
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}
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}
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}
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}
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