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//! *roarsvg* is a library to deserialize lyon [`Path`]s into SVG.
//!
//! It provides a struct [`LyonWriter`] that accepts a [`push`](LyonWriter::push) operation to append [`Path`]s
//! and a [`write`](LyonWriter::write) operation to write all those paths to an SVG using [`usvg`].
use std::rc::Rc;
use lyon_path::{Event, Path};
use usvg::tiny_skia_path::{Path as PathData, PathBuilder};
use usvg::{
AlignmentBaseline, AspectRatio, CharacterPosition, DominantBaseline, Font, Group,
ImageRendering, LengthAdjust, NodeExt, NonZeroPositiveF32, NonZeroRect, Opacity, Paint,
PaintOrder, Path as SvgPath, Size, TextAnchor, TextChunk, TextRendering, TextSpan,
TreeTextToPath, ViewBox, WritingMode,
};
pub use usvg::{Color, Fill, NodeKind, Stroke, Transform as SvgTransform};
use usvg::{StrokeWidth, Text, Tree};
mod io;
use io::to_file;
#[derive(Debug)]
pub enum LyonTranslationError {
WrongBoundingBox {
min_x: f32,
max_x: f32,
min_y: f32,
max_y: f32,
},
NoFonts,
SvgFailure,
FontFailure,
IoWrite(Box<dyn std::error::Error>),
}
/// Translate from [`lyon_path::Path`] to [`usvg::Path`] on [`push`](Self::push)
/// and [write](Self::write) an SVG to a file.
///
/// # Example
///
/// ```
/// use roarsvg::{Color, LyonWriter, SvgTransform, fill, stroke};
/// use lyon_path::Path;
/// use lyon_path::geom::euclid::Point2D;
///
/// let file_path = "a.svg";
/// let mut writer = LyonWriter::new();
///
/// // let's create some path with lyon as an example
/// let mut path_builder = Path::builder();
/// path_builder.begin(Point2D::origin());
/// path_builder.line_to(Point2D::new(1.0, 1.0));
/// path_builder.quadratic_bezier_to(Point2D::new(2.0, 1.0), Point2D::new(3.0, 2.0));
/// path_builder.cubic_bezier_to(
/// Point2D::new(2.0, 1.0),
/// Point2D::new(5.0, 1.0),
/// Point2D::new(3.0, 2.0),
/// );
/// path_builder.end(true);
/// let path = path_builder.build();
/// // push the created path with some fill and stroke, in the origin
/// writer
/// .push(
/// &path,
/// Some(fill(Color::new_rgb(253, 77, 44), 0.8)),
/// Some(stroke(Color::new_rgb(253, 77, 44), 0.8, 2.0)),
/// Some(SvgTransform::from_translate(0.0, 0.0)),
/// )
/// .expect("Path 1 should be writable!");
/// let mut path_builder = Path::builder();
/// // finally, write the SVG
/// writer.write(file_path).expect("Writing should not panic!");
///
/// # std::fs::remove_file(&file_path).unwrap();
/// ```
pub struct LyonWriter<T> {
nodes: Vec<usvg::Node>,
global_transform: Option<SvgTransform>,
fontdb: T,
}
/// Utility function to build a [`Stroke`].
pub fn stroke(color: Color, opacity: f32, width: f32) -> Stroke {
Stroke {
paint: Paint::Color(color),
opacity: Opacity::new_clamped(opacity),
width: StrokeWidth::new(width).expect("Put a real width..."),
..Default::default()
}
}
/// Utility function to build a [`Fill`].
pub fn fill(color: Color, opacity: f32) -> Fill {
Fill {
paint: Paint::Color(color),
opacity: Opacity::new_clamped(opacity),
..Default::default()
}
}
fn min_an_max(
(min_x, max_x, min_y, max_y): (f32, f32, f32, f32),
bound: usvg::Rect,
) -> (f32, f32, f32, f32) {
(
if min_x <= bound.left() {
min_x
} else {
bound.left()
},
if max_x >= bound.right() {
max_x
} else {
bound.right()
},
if min_y <= bound.top() {
min_y
} else {
bound.top()
},
if max_y >= bound.bottom() {
max_y
} else {
bound.bottom()
},
)
}
impl<T> LyonWriter<T> {
/// Add a [`Path`] to the writer and translate it (eager).
pub fn push(
&mut self,
path: &Path,
fill: Option<Fill>,
stroke: Option<Stroke>,
transform: Option<SvgTransform>,
) -> Result<(), LyonTranslationError> {
self.nodes.push(usvg::Node::new(NodeKind::Path(
lyon_path_to_svg_with_attributes(path, fill, stroke, transform)
.ok_or(LyonTranslationError::SvgFailure)?,
)));
Ok(())
}
/// Push a node kind without any indirection.
///
/// For writing Text, call first [`Self::add_fonts`] and call `push_text` instead.
pub fn push_node(&mut self, node: NodeKind) {
self.nodes.push(usvg::Node::new(node));
}
/// Push a raster image (formatted by the caller) as a PNG.
pub fn push_png(
&mut self,
data: &[u8],
transform: SvgTransform,
width: f32,
height: f32,
) -> Result<(), LyonTranslationError> {
self.nodes.push(usvg::Node::new(create_png_node(
data, transform, width, height,
)?));
Ok(())
}
/// Push a vector of nodes as the children of their own group (formatted by the caller).
///
/// This is relevant for applying transforms to a set of elements.
pub fn push_group(
&mut self,
nodes: Vec<NodeKind>,
transform: SvgTransform,
) -> Result<(), LyonTranslationError> {
let group_node = usvg::Node::new(NodeKind::Group(Group {
transform,
..Default::default()
}));
for node in nodes {
group_node.append(usvg::Node::new(node))
}
self.nodes.push(group_node);
Ok(())
}
/// Add/replace a [`SvgTransform`], which will be applied to the whole SVG as a group.
pub fn with_transform(mut self, trans: SvgTransform) -> Self {
self.global_transform = Some(trans);
self
}
/// Build [`Tree`] before writing.
fn prepare(mut self) -> Result<Tree, LyonTranslationError> {
let match_node = |node: &usvg::Node| node.calculate_bbox();
// calculate dimensions
let (min_x, max_x, min_y, max_y) = self
.nodes
.iter()
.filter_map(match_node)
.fold((0f32, 0f32, 0f32, 0f32), min_an_max);
let width = if max_x - min_x > 0. {
max_x - min_x
} else {
256.0
};
let height = if max_y - min_y > 0. {
max_y - min_y
} else {
256.0
};
// the root node of a tree must be a Group
let root_node = usvg::Node::new(NodeKind::Group(Group::default()));
// we append everything to a "real" group node
let group_node = usvg::Node::new(NodeKind::Group(Group {
transform: self.global_transform.unwrap_or_default(),
..Default::default()
}));
use std::cmp::Ordering::*;
self.nodes
.sort_unstable_by(|a, b| match (&*a.borrow(), &*b.borrow()) {
(NodeKind::Group(_), _) => Greater,
(_, NodeKind::Group(_)) => Less,
(NodeKind::Image(_), _) => Greater,
(_, NodeKind::Image(_)) => Less,
(NodeKind::Text(_), NodeKind::Path(_)) => Greater,
(NodeKind::Path(_), NodeKind::Text(_)) => Less,
(NodeKind::Path(p1), NodeKind::Path(p2)) => (2 * p1.fill.is_some() as u8
+ p1.stroke.is_some() as u8)
.cmp(&(2 * p2.fill.is_some() as u8 + p2.stroke.is_some() as u8)),
_ => Equal,
});
for path in self.nodes {
group_node.append(path);
}
root_node.append(group_node);
Ok(Tree {
size: Size::from_wh(width, height).ok_or(LyonTranslationError::WrongBoundingBox {
min_x,
max_x,
min_y,
max_y,
})?,
view_box: ViewBox {
rect: NonZeroRect::from_ltrb(min_x, min_y, max_x, max_y).ok_or(
LyonTranslationError::WrongBoundingBox {
min_x,
max_x,
min_y,
max_y,
},
)?,
aspect: AspectRatio::default(),
},
root: root_node,
})
}
/// Loads fonts from a font database, enabling writing [`Text`] (`push_text`).
pub fn add_fonts<Fp: FontProvider>(self, fonts: Fp) -> LyonWriter<Option<Fp>> {
LyonWriter {
nodes: self.nodes,
global_transform: self.global_transform,
fontdb: Some(fonts),
}
}
/// Loads fonts from a font directory, building a [`FontProvider`] and enabling writing text.
pub fn add_fonts_dir<P: AsRef<std::path::Path>>(
self,
font_dir: P,
) -> LyonWriter<Option<usvg::fontdb::Database>> {
let mut fonts = usvg::fontdb::Database::new();
fonts.load_fonts_dir(font_dir);
LyonWriter {
nodes: self.nodes,
global_transform: self.global_transform,
fontdb: Some(fonts),
}
}
}
/// Utility function to create [`usvg::Image`] elements.
///
/// If no grouping is needed, [`LyonWriter::push_png`] is recommended instead.
pub fn create_png_node(
data: &[u8],
transform: SvgTransform,
width: f32,
height: f32,
) -> Result<NodeKind, LyonTranslationError> {
Ok(NodeKind::Image(usvg::Image {
id: "".to_string(),
kind: usvg::ImageKind::PNG(std::sync::Arc::new(data.into())),
transform: SvgTransform::identity(),
visibility: usvg::Visibility::Visible,
view_box: ViewBox {
rect: NonZeroRect::from_xywh(transform.tx, transform.ty, width, height).ok_or(
LyonTranslationError::WrongBoundingBox {
min_x: transform.tx - width / 2.,
max_x: transform.tx + width / 2.,
min_y: transform.ty - height / 2.,
max_y: transform.ty + height / 2.,
},
)?,
aspect: AspectRatio::default(),
},
rendering_mode: ImageRendering::default(),
}))
}
/// Utility function to create [`Text`] elements.
///
/// If no grouping is needed, [`LyonWriter::push_text`] is recommended instead.
pub fn create_text_node(
text: String,
transform: SvgTransform,
fill: Option<Fill>,
stroke: Option<Stroke>,
font_families: Vec<String>,
font_size: f32,
) -> Result<NodeKind, LyonTranslationError> {
let text_len = text.len();
Ok(NodeKind::Text(Text {
id: "".to_string(),
positions: (0..text_len)
.map(|c| CharacterPosition {
x: Some(c as f32),
y: None,
dx: None,
dy: None,
})
.collect(),
rotate: Vec::new(),
transform,
rendering_mode: TextRendering::GeometricPrecision,
writing_mode: WritingMode::LeftToRight,
chunks: vec![TextChunk {
x: None,
y: None,
text,
anchor: TextAnchor::Start,
text_flow: usvg::TextFlow::Linear,
spans: vec![TextSpan {
start: 0,
end: text_len,
fill,
stroke,
paint_order: PaintOrder::FillAndStroke,
font: Font {
families: font_families,
style: usvg::FontStyle::Normal,
stretch: usvg::FontStretch::Normal,
weight: 1,
},
font_size: NonZeroPositiveF32::new(font_size)
.ok_or(LyonTranslationError::FontFailure)?,
small_caps: false,
apply_kerning: false,
decoration: usvg::TextDecoration {
underline: None,
overline: None,
line_through: None,
},
baseline_shift: Vec::new(),
letter_spacing: 0.0,
word_spacing: 0.0,
text_length: None,
length_adjust: LengthAdjust::SpacingAndGlyphs,
visibility: usvg::Visibility::Visible,
dominant_baseline: DominantBaseline::Auto,
alignment_baseline: AlignmentBaseline::Auto,
}],
}],
}))
}
/// Marker struct for [`LyonWriter`] that indicates that no [`Text`] node has been added
/// so far. It disallows `push_text` and does not convert [`Text`] to [`SvgPath`] upon write.
pub struct NoText;
impl LyonWriter<NoText> {
pub fn new() -> LyonWriter<NoText> {
LyonWriter {
nodes: Vec::new(),
global_transform: None,
fontdb: NoText,
}
}
/// Write the contained [`Path`]s to an SVG at `file_path`. Text will NOT be written!
pub fn write<P: AsRef<std::path::Path>>(
self,
file_path: P,
) -> Result<(), LyonTranslationError> {
let tree = self.prepare()?;
to_file(tree, file_path)?;
Ok(())
}
/// Loads fonts from a font file, building a [`FontProvider`] and enabling writing text.
pub fn add_fonts_source(
self,
font_source: &[u8],
) -> LyonWriter<Option<usvg::fontdb::Database>> {
let mut fonts = usvg::fontdb::Database::new();
fonts.load_font_data(font_source.to_vec());
LyonWriter {
nodes: self.nodes,
global_transform: self.global_transform,
fontdb: Some(fonts),
}
}
}
impl Default for LyonWriter<NoText> {
fn default() -> Self {
Self::new()
}
}
/// Marker trait that changes the behavior of `write` for [`LyonWriter`]
/// and allows for writing text to the SVG.
pub trait FontProvider {
fn get_fontdb(self) -> usvg::fontdb::Database;
}
impl FontProvider for usvg::fontdb::Database {
fn get_fontdb(self) -> usvg::fontdb::Database {
self
}
}
/// Implemented for `Option<T>` to be able to ergonomically take it without cloning.
impl<T: FontProvider> LyonWriter<Option<T>> {
/// Add [`Text`] to the writer, filling it as an unique [`TextChunk`] whose
/// [`TextSpan`] style applies to all the text.
///
/// Requires having called [`LyonWriter::add_fonts`] beforehand.
///
/// # Example
///
/// ```
/// use roarsvg::{Color, LyonWriter, SvgTransform, fill, stroke};
/// use lyon_path::Path;
/// use lyon_path::geom::euclid::Point2D;
///
/// let file_path = "text.svg";
///
/// let writer = LyonWriter::new();
/// let mut fontdb = usvg::fontdb::Database::new();
/// fontdb.load_system_fonts();
/// let mut writer = writer.add_fonts(fontdb);
/// // first we add a Path, if not, the ViewBox calculation will panic!
/// // this is a caveat and should be fixed in the future
/// let mut path_builder = Path::builder();
/// path_builder.begin(Point2D::origin());
/// path_builder.line_to(
/// Point2D::new(3.0, 2.0),
/// );
/// path_builder.end(true);
/// writer
/// .push(
/// &path_builder.build(),
/// None,
/// Some(stroke(Color::black(), 1.0, 1.0)),
/// Some(SvgTransform::from_translate(2.0, 2.0)),
/// )
/// .expect("Path 1 should be writable!");
///
/// // push the created path with some fill and stroke, in the origin
/// writer
/// .push_text(
/// "hello".to_string(),
/// vec!["Arial".to_string()],
/// 12.0,
/// SvgTransform::from_translate(0., 0.),
/// Some(fill(usvg::Color::black(), 1.0)),
/// Some(stroke(usvg::Color::black(), 1.0, 1.0)),
/// )
/// .expect("Text should be writable!");
/// let mut path_builder = Path::builder();
/// // finally, write the SVG, Text with be converted to SvgPath
/// writer.write(file_path).expect("Writing should not panic!");
///
/// # std::fs::remove_file(&file_path).unwrap();
/// ```
pub fn push_text(
&mut self,
text: String,
font_families: Vec<String>,
font_size: f32,
transform: SvgTransform,
fill: Option<Fill>,
stroke: Option<Stroke>,
) -> Result<(), LyonTranslationError> {
self.nodes.push(usvg::Node::new(create_text_node(
text,
transform,
fill,
stroke,
font_families,
font_size,
)?));
Ok(())
}
/// Loads fonts from a font file, building a [`FontProvider`] if needed and enabling writing text.
pub fn add_fonts_source(
self,
font_source: &[u8],
) -> LyonWriter<Option<usvg::fontdb::Database>> {
let mut fonts = self.fontdb.map(|f| f.get_fontdb()).unwrap_or_default();
fonts.load_font_data(font_source.to_vec());
LyonWriter {
nodes: self.nodes,
global_transform: self.global_transform,
fontdb: Some(fonts),
}
}
/// Write the contained [`Path`]s to an SVG at `file_path`, converting all [`Text`] nodes
/// to paths.
pub fn write<P: AsRef<std::path::Path>>(
mut self,
file_path: P,
) -> Result<(), LyonTranslationError> {
let fontdb = self
.fontdb
.take()
.ok_or(LyonTranslationError::NoFonts)?
.get_fontdb();
let mut tree = self.prepare()?;
tree.convert_text(&fontdb);
to_file(tree, file_path)?;
Ok(())
}
}
fn lyon_path_to_svg_with_attributes(
path: &Path,
fill: Option<Fill>,
stroke: Option<Stroke>,
transform: Option<SvgTransform>,
) -> Option<SvgPath> {
let mut op = SvgPath::new(Rc::new(lyon_path_to_usvg(path)?));
op.fill = fill;
op.stroke = stroke;
if let Some(trans) = transform {
op.transform = trans;
}
Some(op)
}
fn lyon_path_to_usvg(path: &Path) -> Option<PathData> {
let mut upath_builder = PathBuilder::new();
let mut current = None;
for event in path.iter() {
match event {
Event::Begin { at } => {
current = Some(at);
upath_builder.move_to(at.x, at.y)
}
Event::Line { from, to } => {
if let Some(current_point) = current {
if from != current_point {
upath_builder.move_to(from.x, from.y);
}
}
upath_builder.line_to(to.x, to.y);
current = Some(to)
}
Event::Quadratic { from, ctrl, to } => {
if let Some(current_point) = current {
if from != current_point {
upath_builder.move_to(from.x, from.y);
}
}
// TODO: check if ctrl is that one
upath_builder.quad_to(ctrl.x, ctrl.y, to.x, to.y);
current = Some(to)
}
Event::Cubic {
from,
ctrl1,
ctrl2,
to,
} => {
if let Some(current_point) = current {
if from != current_point {
upath_builder.move_to(from.x, from.y);
}
}
// TODO: check if ctrl is that one
upath_builder.cubic_to(ctrl1.x, ctrl1.y, ctrl2.x, ctrl2.y, to.x, to.y);
current = Some(to)
}
Event::End { last, first, close } => {
if let Some(current_point) = current {
if last != current_point {
upath_builder.move_to(last.x, last.y);
}
}
if close {
upath_builder.line_to(first.x, first.y);
upath_builder.close();
}
current = Some(last)
}
}
}
upath_builder.finish()
}
#[cfg(test)]
mod tests {
use lyon_path::geom::euclid::Point2D;
use super::*;
#[test]
fn lines_deserialize() {
let mut path_builder = Path::builder();
path_builder.begin(Point2D::origin());
path_builder.line_to(Point2D::new(1.0, 1.0));
path_builder.line_to(Point2D::new(2.0, 1.0));
path_builder.end(true);
let path = path_builder.build();
assert!(lyon_path_to_usvg(&path).unwrap().len() == 5);
}
#[test]
fn attributes_are_ok() {
let mut path_builder = Path::builder();
path_builder.begin(Point2D::origin());
path_builder.line_to(Point2D::new(1.0, 1.0));
path_builder.quadratic_bezier_to(Point2D::new(2.0, 1.0), Point2D::new(3.0, 2.0));
path_builder.end(true);
let path = path_builder.build();
assert!(
lyon_path_to_svg_with_attributes(&path, None, None, None)
.unwrap()
.data
.len()
== 5
);
}
#[test]
fn writing_does_not_panic() {
let file_path = "tmpthis.svg";
let mut writer = LyonWriter::new();
let mut path_builder = Path::builder();
path_builder.begin(Point2D::origin());
path_builder.line_to(Point2D::new(1.0, 1.0));
path_builder.quadratic_bezier_to(Point2D::new(2.0, 1.0), Point2D::new(3.0, 2.0));
path_builder.cubic_bezier_to(
Point2D::new(2.0, 1.0),
Point2D::new(5.0, 1.0),
Point2D::new(3.0, 2.0),
);
path_builder.end(true);
let path = path_builder.build();
writer
.push(
&path,
None,
Some(stroke(Color::new_rgb(253, 77, 44), 0.8, 2.0)),
Some(SvgTransform::from_translate(0.0, 0.0)),
)
.expect("Path 1 should be writable!");
let mut path_builder = Path::builder();
path_builder.begin(Point2D::origin());
path_builder.cubic_bezier_to(
Point2D::new(2.0, 1.0),
Point2D::new(5.0, 1.0),
Point2D::new(3.0, 2.0),
);
path_builder.end(true);
let path = path_builder.build();
writer
.push(
&path,
None,
Some(stroke(Color::black(), 1.0, 1.0)),
Some(SvgTransform::from_translate(2.0, 2.0)),
)
.expect("Path 2 should be writable!");
writer.write(file_path).expect("Writing should not panic!");
std::fs::remove_file(file_path).unwrap();
}
#[test]
fn path_and_texts_do_not_panic() {
let file_path = "textex.svg";
let mut writer = LyonWriter::new();
// push the created path with some fill and stroke, in the origin
let mut path_builder = Path::builder();
path_builder.begin(Point2D::origin());
path_builder.cubic_bezier_to(
Point2D::new(2.0, 1.0),
Point2D::new(5.0, 1.0),
Point2D::new(3.0, 2.0),
);
path_builder.end(true);
let path = path_builder.build();
writer
.push(
&path,
None,
Some(stroke(Color::black(), 1.0, 1.0)),
Some(SvgTransform::from_translate(2.0, 2.0)),
)
.expect("Path 1 should be writable!");
let mut fontdb = usvg::fontdb::Database::new();
fontdb.load_system_fonts();
let mut writer = writer.add_fonts(fontdb);
writer
.push_text(
"hello".to_string(),
vec!["Arial".to_string()],
12.0,
SvgTransform::from_translate(0., 0.),
Some(fill(usvg::Color::black(), 1.0)),
Some(stroke(usvg::Color::black(), 1.0, 1.0)),
)
.expect("Text should be writable!");
// finally, write the SVG, Text with be converted to SvgPath
writer.write(file_path).expect("Writing should not panic!");
std::fs::remove_file(file_path).unwrap();
}
}