intvg 0.1.7

lib/tool in Rust to load/save/render tvg file, parse from svg file by usvg
Documentation 
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use crate::tinyvg::*;
use crate::gpac_evg::*;
use std::{io, result::Result};

pub trait Render { fn render(&self, scale: f32) -> Result<Pixmap, &str>; }

impl<R: io::Read, W: io::Write> Render for TinyVG<R, W> {
    fn render(&self, scale: f32) -> Result<Pixmap, &str> {
        let mut pixm = Pixmap::new(
            (self.header.width  as f32 * scale).ceil() as _,
            (self.header.height as f32 * scale).ceil() as _);

        impl From<&Rect> for GF_Rect {
            fn from(rect: &Rect) -> Self {  // XXX: screen to world coordinates
                Self {  x: rect.x.into(), y: (rect.y + rect.h).into(),
                    width: rect.w.into(),      height: rect.h .into(), }
            }
        }

        // XXX: rendering up-scale and then scale down for anti-aliasing?
        let (surf, path) = (Surface::new(&mut pixm), VGPath::new());
        let mut pens = GF_PenSettings::default();

        let trfm = GF_Matrix2D {
            m: [scale.into(), 0.into(), 0.into(), 0.into(), scale.into(), 0.into()] };
        surf.set_matrix(&trfm);

        for cmd in &self.commands {
            match cmd { Command::EndOfDocument => (),
                Command::FillPolyg(FillCMD { fill, coll }) => {
                    let mut iter = coll.iter();
                    if let Some(pt) = iter.next() { path.move_to((*pt).into()) }
                    iter.for_each(|pt| path.line_to((*pt).into()));  path.close();
                    surf.fill_path(&path, &style_to_stencil(self, fill));
                }
                Command::FillRects(FillCMD { fill, coll }) => {
                    let sten = style_to_stencil(self, fill);
                    coll.iter().for_each(|rect| path.add_rect(rect.into()));
                    surf.fill_path(&path, &sten);    //path.reset();
                }
                Command::FillPath (FillCMD { fill, coll }) => {
                    let sten = style_to_stencil(self, fill);
                    for seg in coll { let _ = segment_to_path(seg, &path); }
                    surf.fill_path(&path, &sten);    //path.reset();
                }
                Command::DrawLines(DrawCMD { line, lwidth, coll }) => {
                    coll.iter().for_each(|line| {
                        path.move_to(line.start.into()); path.line_to(line.  end.into());
                    }); pens.width =  (*lwidth).into();
                    surf.stroke_path(&path, &style_to_stencil(self, line), &pens);
                }
                Command::DrawLoop (DrawCMD { line, lwidth, coll },
                    strip) => {     let mut iter = coll.iter();
                    if let Some(pt) = iter.next() { path.move_to((*pt).into()) }
                    iter.for_each(|pt| path.line_to((*pt).into()));

                    if !*strip { path.close(); }    pens.width = (*lwidth).into();
                    surf.stroke_path(&path, &style_to_stencil(self, line), &pens);
                }
                Command::DrawPath (DrawCMD {
                    line, lwidth, coll }) => {
                    let sten = style_to_stencil(self, line);
                    pens.width = (*lwidth).into();

                    for seg in coll {
                        stroke_segment_path(seg, &surf, &sten, &mut pens); }
                }
                Command::OutlinePolyg(fill, DrawCMD {
                    line, lwidth, coll }) => {
                    pens.width = (*lwidth).into();

                    let mut iter = coll.iter();
                    if let Some(pt) = iter.next() { path.move_to((*pt).into()) }
                    iter.for_each(|pt| path.line_to((*pt).into()));  path.close();

                    surf.  fill_path(&path, &style_to_stencil(self, fill));
                    surf.stroke_path(&path, &style_to_stencil(self, line), &pens);
                }
                Command::OutlineRects(fill, DrawCMD {
                    line, lwidth, coll }) => {
                    pens.width = (*lwidth).into();
                    let paint = style_to_stencil(self, fill);
                    let pline = style_to_stencil(self, line);

                    coll.iter().for_each(|rect| path.add_rect(rect.into()));
                    surf.  fill_path(&path, &paint);
                    surf.stroke_path(&path, &pline, &pens);     //path.reset();
                }
                Command::OutlinePath (fill, DrawCMD {
                    line, lwidth, coll }) => {
                    let paint = style_to_stencil(self, fill);
                    let pline = style_to_stencil(self, line);

                    pens.width = (*lwidth).into();  let mut res = false;
                    for seg in coll { res = segment_to_path(seg, &path); }
                    surf.fill_path(&path, &paint);

                    if res { for seg in coll {
                        stroke_segment_path(seg, &surf, &pline, &mut pens);
                    } } else { surf.stroke_path(&path, &pline, &pens); }  //path.reset();
                }
            }   path.reset();
        }   Ok(pixm)
    }
}

fn stroke_segment_path(seg: &Segment, surf: &Surface,
    sten: &Stencil, pens: &mut GF_PenSettings) {
    let path = VGPath::new();
    path.move_to(seg.start.into());

    for cmd in &seg.cmds {
        if let Some(width) = cmd.lwidth {
            if 1 < path.len() {
                let start = path.last_point().unwrap();
                surf.stroke_path(&path, sten, pens);
                path.reset(); path.move_to(start);
            }   pens.width = width.into();
        }   process_segcmd(&path, &cmd.instr);
    }   surf.stroke_path(&path, sten, pens);
}

fn segment_to_path(seg: &Segment, path: &VGPath) -> bool {
    path.move_to(seg.start.into());
    let mut change_lw = false;

    for cmd in &seg.cmds {
        if cmd.lwidth.is_some() { change_lw = true }
        process_segcmd(path, &cmd.instr);
    }   change_lw
}

fn process_segcmd(path: &VGPath, cmd: &SegInstr) {
    match cmd {     SegInstr::ClosePath => path.close(),
        SegInstr::Line  { end } => path.line_to((*end).into()),
        SegInstr::HLine { x }     =>
            path.line_to(GF_Point2D { x: (*x).into(), y: path.last_point().unwrap().y }),
        SegInstr::VLine { y }     =>
            path.line_to(GF_Point2D { x: path.last_point().unwrap().x, y: (*y).into() }),

        SegInstr::CubicBezier { ctrl, end } =>
            path.cubic_to(ctrl.0.into(), ctrl.1.into(), (*end).into()),
        SegInstr::ArcCircle  { large, sweep, radius, target } =>
            path.svg_arc_to(GF_Point2D { x: (*radius).into(), y: (*radius).into()},
                0.into(), *large, *sweep, (*target).into()),

        SegInstr::ArcEllipse { large, sweep, radius,
            rotation, target } => path.svg_arc_to(
                GF_Point2D { x: radius.0.into(), y: radius.1.into() },
                (*rotation).into(), *large, *sweep, (*target).into()),

        SegInstr::QuadBezier { ctrl, end } =>
            path.quad_to((*ctrl).into(), (*end).into()),
    }
}

fn style_to_stencil<R: io::Read, W: io::Write>(img: &TinyVG<R, W>, style: &Style) -> Stencil {
    impl From<RGBA8888> for GF_Color {
        fn from(color: RGBA8888) -> Self { // convert to 0xAARRGGBB
            (color.a as u32) << 24 | (color.r as u32) << 16 |
            (color.g as u32) <<  8 |  color.b as u32
        }
    }   use crate::gpac_evg::GF_StencilType::*;

    match style {
        Style::FlatColor(idx) => {
            let sten = Stencil::new(GF_STENCIL_SOLID);
            sten.set_color(img.lookup_color(*idx).into());  sten
        }
        Style::LinearGradient { points, cindex } => {
            let sten = Stencil::new(GF_STENCIL_LINEAR_GRADIENT);
            sten.push_interpolation(0.into(), img.lookup_color(cindex.0).into());
            sten.push_interpolation(1.into(), img.lookup_color(cindex.1).into());
            sten.set_linear(points.0.into(), points.1.into());
            sten    //sten.set_matrix(trfm);
        }
        Style::RadialGradient { points, cindex } => {
            let radius = (points.1.x - points.0.x).hypot(points.1.y - points.0.y);
            let radius = GF_Point2D { x: radius.into(), y: radius.into() };

            let sten = Stencil::new(GF_STENCIL_RADIAL_GRADIENT);
            sten.push_interpolation(0.into(), img.lookup_color(cindex.0).into());
            sten.push_interpolation(1.into(), img.lookup_color(cindex.1).into());
            sten.set_radial(points.0.into(), points.0.into(), radius);
            sten    //sten.set_matrix(trfm);
        }
    }
}

impl From<Point> for GF_Point2D {
    fn from(pt:  Point) -> Self { Self { x: pt.x.into(), y: pt.y.into() } }
}

/* impl From<tiny_skia::Transform> for GF_Matrix2D {
    fn from(mv: tiny_skia::Transform) -> Self {
        Self { m: [mv.sx.into(), mv.kx.into(), mv.tx.into(),
                   mv.sy.into(), mv.ky.into(), mv.ty.into()] }
        // sx = m[0], kx = m[1], tx = m[2], sy = m[3], ky = m[4], ty = m[5]
    }
} */