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| 1 | +use fontdb::{Database, Weight}; |
| 2 | +use fontkit::{FontKey, Width}; |
| 3 | +#[cfg(not(target_arch = "wasm32"))] |
| 4 | +use napi::bindgen_prelude::{Buffer, Either, Error as NapiError}; |
| 5 | +#[cfg(not(target_arch = "wasm32"))] |
| 6 | +use napi_derive::napi; |
| 7 | +use ouroboros::self_referencing; |
| 8 | +use roxmltree::Document; |
| 9 | + |
| 10 | +use crate::{options::JsOptions, Resvg}; |
| 11 | + |
| 12 | +#[cfg_attr(target_arch = "wasm32", wasm_bindgen)] |
| 13 | +#[cfg_attr(not(target_arch = "wasm32"), napi)] |
| 14 | +#[ouroboros::self_referencing] |
| 15 | +pub struct ResvgBuilder { |
| 16 | + js_options: JsOptions, |
| 17 | + data: String, |
| 18 | + #[borrows(data)] |
| 19 | + #[covariant] |
| 20 | + doc: Document<'this>, |
| 21 | +} |
| 22 | + |
| 23 | +#[napi(js_name = "FontKey")] |
| 24 | +pub struct FontKeyWrapper(FontKey); |
| 25 | + |
| 26 | +#[cfg(not(target_arch = "wasm32"))] |
| 27 | +#[napi] |
| 28 | +impl ResvgBuilder { |
| 29 | + #[napi(constructor)] |
| 30 | + pub fn new_napi( |
| 31 | + svg: Either<String, Buffer>, |
| 32 | + options: Option<String>, |
| 33 | + ) -> Result<ResvgBuilder, NapiError> { |
| 34 | + ResvgBuilder::new_napi_inner(&svg, options) |
| 35 | + } |
| 36 | + |
| 37 | + pub fn new_napi_inner( |
| 38 | + svg: &Either<String, Buffer>, |
| 39 | + options: Option<String>, |
| 40 | + ) -> Result<ResvgBuilder, NapiError> { |
| 41 | + let js_options: JsOptions = options |
| 42 | + .and_then(|o| serde_json::from_str(o.as_str()).ok()) |
| 43 | + .unwrap_or_default(); |
| 44 | + let _ = env_logger::builder() |
| 45 | + .filter_level(js_options.log_level) |
| 46 | + .try_init(); |
| 47 | + let mut opts = js_options.to_usvg_options(); |
| 48 | + crate::options::tweak_usvg_options(&mut opts); |
| 49 | + let data = match svg { |
| 50 | + Either::A(a) => a.as_str(), |
| 51 | + Either::B(b) => std::str::from_utf8(b.as_ref()) |
| 52 | + .map_err(|e| napi::Error::from_reason(format!("{}", e)))?, |
| 53 | + }; |
| 54 | + ResvgBuilderTryBuilder { |
| 55 | + js_options, |
| 56 | + data: data.to_string(), |
| 57 | + doc_builder: |input| Document::parse(input), |
| 58 | + } |
| 59 | + .try_build() |
| 60 | + .map_err(|e| napi::Error::from_reason(format!("{}", e))) |
| 61 | + } |
| 62 | + |
| 63 | + #[napi] |
| 64 | + pub fn texts_to_resolve(&self) -> Vec<FontKeyWrapper> { |
| 65 | + self.borrow_doc() |
| 66 | + .descendants() |
| 67 | + .filter_map(|node| { |
| 68 | + let name = node.tag_name().name(); |
| 69 | + if name == "text" || name == "tspan" { |
| 70 | + let family = resolve_font_family(&node).unwrap_or_else(|| { |
| 71 | + self.borrow_js_options().font.default_font_family.as_str() |
| 72 | + }); |
| 73 | + let width = node |
| 74 | + .attribute("font-stretch") |
| 75 | + .and_then(|s| s.parse::<Width>().ok()) |
| 76 | + .unwrap_or(Width::from(5)); |
| 77 | + let weight = resolve_font_weight(&node); |
| 78 | + let italic = node |
| 79 | + .attribute("font-style") |
| 80 | + .map(|s| s == "italic") |
| 81 | + .unwrap_or_default(); |
| 82 | + let font_key = FontKey::new(family, weight.0 as u32, italic, width); |
| 83 | + Some(FontKeyWrapper(font_key)) |
| 84 | + } else { |
| 85 | + None |
| 86 | + } |
| 87 | + }) |
| 88 | + .collect() |
| 89 | + } |
| 90 | + |
| 91 | + pub fn resolve_font(&mut self, font: Buffer) { |
| 92 | + self.with_js_options_mut(|opts| opts.font_db.load_font_data(font.into())); |
| 93 | + } |
| 94 | + |
| 95 | + pub fn build(self) -> Result<Resvg, NapiError> { |
| 96 | + let ouroboros_impl_resvg_builder::Heads { js_options, data } = self.into_heads(); |
| 97 | + let mut opts = js_options.to_usvg_options(); |
| 98 | + crate::options::tweak_usvg_options(&mut opts); |
| 99 | + let opts_ref = opts.to_ref(); |
| 100 | + let tree = usvg::Tree::from_str(data.as_str(), &opts_ref) |
| 101 | + .map_err(|e| napi::Error::from_reason(format!("{}", e)))?; |
| 102 | + Ok(Resvg { tree, js_options }) |
| 103 | + } |
| 104 | + |
| 105 | + // fn new_inner( |
| 106 | + // svg: &Either<String, Buffer>, |
| 107 | + // options: Option<String>, |
| 108 | + // ) -> Result<Resvg, NapiError> { |
| 109 | + // let opts_ref = opts.to_ref(); |
| 110 | + // // Parse the SVG string into a tree. |
| 111 | + // let tree = match svg { |
| 112 | + // Either::A(a) => usvg::Tree::from_str(a.as_str(), &opts_ref), |
| 113 | + // Either::B(b) => usvg::Tree::from_data(b.as_ref(), &opts_ref), |
| 114 | + // } |
| 115 | + // .map_err(|e| napi::Error::from_reason(format!("{}", e)))?; |
| 116 | + // Ok(Resvg { tree, js_options }) |
| 117 | + // } |
| 118 | +} |
| 119 | + |
| 120 | +fn resolve_font_family<'a, 'input>(node: &roxmltree::Node<'a, 'input>) -> Option<&'a str> { |
| 121 | + for n in node.ancestors() { |
| 122 | + if let Some(family) = n.attribute("font-family") { |
| 123 | + return Some(family); |
| 124 | + } |
| 125 | + } |
| 126 | + None |
| 127 | +} |
| 128 | + |
| 129 | +// This method is extracted from usvg to keep the logic here is the same with usvg |
| 130 | +fn resolve_font_weight<'a, 'input>(node: &roxmltree::Node<'a, 'input>) -> fontdb::Weight { |
| 131 | + fn bound(min: usize, val: usize, max: usize) -> usize { |
| 132 | + std::cmp::max(min, std::cmp::min(max, val)) |
| 133 | + } |
| 134 | + |
| 135 | + let nodes: Vec<_> = node.ancestors().collect(); |
| 136 | + let mut weight = 400; |
| 137 | + for n in nodes.iter().rev().skip(1) { |
| 138 | + // skip Root |
| 139 | + weight = match n.attribute("font-weight").unwrap_or("") { |
| 140 | + "normal" => 400, |
| 141 | + "bold" => 700, |
| 142 | + "100" => 100, |
| 143 | + "200" => 200, |
| 144 | + "300" => 300, |
| 145 | + "400" => 400, |
| 146 | + "500" => 500, |
| 147 | + "600" => 600, |
| 148 | + "700" => 700, |
| 149 | + "800" => 800, |
| 150 | + "900" => 900, |
| 151 | + "bolder" => { |
| 152 | + // By the CSS2 spec the default value should be 400 |
| 153 | + // so `bolder` will result in 500. |
| 154 | + // But Chrome and Inkscape will give us 700. |
| 155 | + // Have no idea is it a bug or something, but |
| 156 | + // we will follow such behavior for now. |
| 157 | + let step = if weight == 400 { 300 } else { 100 }; |
| 158 | + |
| 159 | + bound(100, weight + step, 900) |
| 160 | + } |
| 161 | + "lighter" => { |
| 162 | + // By the CSS2 spec the default value should be 400 |
| 163 | + // so `lighter` will result in 300. |
| 164 | + // But Chrome and Inkscape will give us 200. |
| 165 | + // Have no idea is it a bug or something, but |
| 166 | + // we will follow such behavior for now. |
| 167 | + let step = if weight == 400 { 200 } else { 100 }; |
| 168 | + |
| 169 | + bound(100, weight - step, 900) |
| 170 | + } |
| 171 | + _ => weight, |
| 172 | + }; |
| 173 | + } |
| 174 | + |
| 175 | + fontdb::Weight(weight as u16) |
| 176 | +} |
| 177 | + |
| 178 | +#[cfg(target_arch = "wasm32")] |
| 179 | +#[wasm_bindgen] |
| 180 | +impl ResvgBuilder { |
| 181 | + #[wasm_bindgen(constructor)] |
| 182 | + pub fn new(svg: IStringOrBuffer, options: Option<String>) -> Result<Resvg, js_sys::Error> { |
| 183 | + let js_options: JsOptions = options |
| 184 | + .and_then(|o| serde_json::from_str(o.as_str()).ok()) |
| 185 | + .unwrap_or_default(); |
| 186 | + |
| 187 | + let mut opts = js_options.to_usvg_options(); |
| 188 | + options::tweak_usvg_options(&mut opts); |
| 189 | + let opts_ref = opts.to_ref(); |
| 190 | + let tree = if js_sys::Uint8Array::instanceof(&svg) { |
| 191 | + let uintarray = js_sys::Uint8Array::unchecked_from_js_ref(&svg); |
| 192 | + let svg_buffer = uintarray.to_vec(); |
| 193 | + usvg::Tree::from_data(&svg_buffer, &opts_ref).map_err(Error::from) |
| 194 | + } else if let Some(s) = svg.as_string() { |
| 195 | + usvg::Tree::from_str(s.as_str(), &opts_ref).map_err(Error::from) |
| 196 | + } else { |
| 197 | + Err(Error::InvalidInput) |
| 198 | + }?; |
| 199 | + Ok(Resvg { tree, js_options }) |
| 200 | + } |
| 201 | +} |
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