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feat: add svg render methods to Font
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| use crate::{ | ||
| bindings::{hb_codepoint_t, hb_glyph_to_svg_path}, | ||
| font::Font, | ||
| shape, Feature, GlyphPosition, HarfbuzzObject, UnicodeBuffer, | ||
| }; | ||
| #[derive(Debug)] | ||
| pub struct GlyphInfoWithSvgPath { | ||
| svg_path: String, | ||
| position: GlyphPosition, | ||
| } | ||
|
|
||
| #[derive(Debug)] | ||
| pub struct BoundingBox { | ||
| height: f64, | ||
| width: f64, | ||
| } | ||
|
|
||
| impl<'a> Font<'a> { | ||
| pub fn glyph_to_svg_path(&mut self, glyph: hb_codepoint_t) -> String { | ||
| const PATH_BUFFER_SIZE: u32 = 65536; // should be enough for most glyphs | ||
| let mut path_buffer = vec![0_i8; PATH_BUFFER_SIZE as usize]; | ||
| unsafe { | ||
| hb_glyph_to_svg_path( | ||
| self.as_raw(), | ||
| glyph, | ||
| path_buffer.as_mut_ptr(), | ||
| PATH_BUFFER_SIZE, | ||
| ); | ||
| } | ||
| let end_pos = path_buffer.iter().position(|&x| x == 0).unwrap(); | ||
| let u8_array: Vec<u8> = path_buffer[..end_pos].iter().map(|&x| x as u8).collect(); | ||
| String::from_utf8(u8_array).unwrap() | ||
| } | ||
| fn sharp_text_to_glyphs( | ||
| &mut self, | ||
| text: &str, | ||
| features: &[Feature], | ||
| ) -> Vec<GlyphInfoWithSvgPath> { | ||
| self.set_scale(100, -100); | ||
|
|
||
| let buffer = UnicodeBuffer::new() | ||
| .add_str(text) | ||
| .guess_segment_properties() | ||
| .set_direction(crate::Direction::Ltr); | ||
| let result_buffer = shape(self, buffer, features); | ||
| let infos = result_buffer.get_glyph_infos(); | ||
| let positions = result_buffer.get_glyph_positions(); | ||
| let result: Vec<GlyphInfoWithSvgPath> = positions | ||
| .iter() | ||
| .zip(infos) | ||
| .map(|(position, info)| GlyphInfoWithSvgPath { | ||
| svg_path: self.glyph_to_svg_path(info.codepoint), | ||
| position: *position, | ||
| }) | ||
| .collect(); | ||
| result | ||
| } | ||
| pub fn render_svg_text(&mut self, text: &str, features: &[Feature]) -> String { | ||
| let base_line = 24; | ||
| let line_height = 1.0; | ||
| let line_height_px = 100.0 * line_height; | ||
| let rows: Vec<Vec<GlyphInfoWithSvgPath>> = text | ||
| .split('\n') | ||
| .map(|t| self.sharp_text_to_glyphs(t, features)) | ||
| .collect(); | ||
|
|
||
| let mut max_bounding = BoundingBox { | ||
| height: 0.0, | ||
| width: 0.0, | ||
| }; | ||
|
|
||
| let mut bounding = BoundingBox { | ||
| height: line_height_px, | ||
| width: 0.0, | ||
| }; | ||
|
|
||
| let paths: Vec<String> = rows | ||
| .iter() | ||
| .flat_map(|row| { | ||
| let rendered_row: Vec<String> = row | ||
| .iter() | ||
| .map(|glyph| { | ||
| let path: String = format!( | ||
| r#"<path transform="translate({} {})" d="{}"></path>"#, | ||
| bounding.width, | ||
| bounding.height + glyph.position.y_advance as f64, | ||
| glyph.svg_path | ||
| ); | ||
| bounding.width += glyph.position.x_advance as f64; | ||
| path | ||
| }) | ||
| .collect(); | ||
| // set the maximum bounding box | ||
| max_bounding.height = max_bounding.height.max(bounding.height as f64); | ||
| max_bounding.width = max_bounding.width.max(bounding.width as f64); | ||
|
|
||
| // reset row width | ||
| bounding.height += line_height_px; | ||
| bounding.width = 0.0; | ||
|
|
||
| rendered_row | ||
| }) | ||
| .collect(); | ||
|
|
||
| format!( | ||
| r#"<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="{}" height="{}" viewBox="0 0 {} {}">{}</svg>"#, | ||
| max_bounding.width, | ||
| max_bounding.height, | ||
| max_bounding.width + base_line as f64, | ||
| max_bounding.height + base_line as f64, | ||
| paths.join("") | ||
| ) | ||
| } | ||
| } | ||
| #[cfg(test)] | ||
| mod test { | ||
|
|
||
| use crate::Face; | ||
|
|
||
| use super::*; | ||
|
|
||
| #[test] | ||
| fn test_glyph_to_svg() { | ||
| let path = "testfiles/SourceSansVariable-Roman.ttf"; | ||
| let face = Face::from_file(path, 0).unwrap(); | ||
| let mut font = Font::new(face); | ||
| let graph_str = font.glyph_to_svg_path(b'h' as u32); | ||
| assert_eq!( | ||
| graph_str, | ||
| "M100,0L100,660L454,660L454,632L132,632L132,366L402,366L402,338L132,338L132,28L464,28L464,0L100,0ZM185,710L171,726L267,808L295,808L391,726L377,710L283,778L279,778L185,710ZM143,844Q144,860 149.5,877.5Q155,895 169.5,907.5Q184,920 211,920Q237,920 255.5,912Q274,904 289,893Q304,882 318.5,874Q333,866 353,866Q374,866 383,880.5Q392,895 395,918L419,916Q418,900 412.5,882.5Q407,865 392.5,852.5Q378,840 351,840Q325,840 306.5,848Q288,856 273,867Q258,878 243.5,886Q229,894 209,894Q188,894 179,879.5Q170,865 167,842L143,844Z") | ||
| } | ||
| #[test] | ||
| fn test_svg_text() { | ||
| let path = "testfiles/SourceSansVariable-Roman.ttf"; | ||
| let face = Face::from_file(path, 0).unwrap(); | ||
| let mut font = Font::new(face); | ||
| let features = [Feature::new(b"liga", 1, 0..10000)]; | ||
| let graph_str = font.render_svg_text("Hello World\nIt's me!\nliga feature fft!", &features); | ||
| assert_eq!(graph_str.starts_with("<svg"), true); | ||
| assert_eq!(graph_str.ends_with("</path></svg>"), true); | ||
| } | ||
| } |