mirror of
https://github.com/storytold/deckcraft.git
synced 2026-10-31 14:07:06 -06:00
refactor(render): split lib.rs into {raster,opts,slide,renderer,geometry,stroke,text_draw}.rs
This commit is contained in:
aiongg
@@ -0,0 +1,201 @@
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use super::*;
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pub(crate) fn color(c: Rgba, alpha: f64) -> peniko::Color {
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let a = (c.a as f64 * alpha.clamp(0.0, 1.0)).round().clamp(0.0, 255.0) as u8;
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peniko::Color::from_rgba8(c.r, c.g, c.b, a)
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}
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pub(crate) fn shade(c: Rgba, m: FillMode) -> Rgba {
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match m {
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FillMode::Lighten => c.lerp(Rgba::WHITE.with_alpha(c.a), 0.4),
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FillMode::LightenLess => c.lerp(Rgba::WHITE.with_alpha(c.a), 0.2),
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FillMode::Darken => c.lerp(Rgba::BLACK.with_alpha(c.a), 0.4),
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FillMode::DarkenLess => c.lerp(Rgba::BLACK.with_alpha(c.a), 0.2),
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_ => c,
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}
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}
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/// Geometry of a shape at its size.
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pub fn shape_geometry(shape: &Shape, w: f64, h: f64) -> Geometry {
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match &shape.geom {
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Geom::Preset { name, adj } => preset::build(name, w, h, adj).or_else(|| preset::build("rect", w, h, &[])).unwrap_or(Geometry {
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paths: vec![],
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text_rect: Rect::new(0.0, 0.0, w, h),
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handles: vec![],
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sites: vec![],
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}),
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Geom::Custom { paths } => {
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let mut out = vec![];
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for p in paths {
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let (pw, ph) = (if p.w > 0.0 { p.w } else { w.max(1e-9) }, if p.h > 0.0 { p.h } else { h.max(1e-9) });
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let mut bp = parse_path(&p.d);
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bp.apply_affine(Affine::scale_non_uniform(w / pw, h / ph));
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// PowerPoint fills each custom path's sub-paths alternately (even-odd): a sub-path
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// inside another cuts a hole whichever way it winds, as in icons and outlined text.
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out.push(SubPath { path: bp, fill: p.fill, stroke: p.stroke, even_odd: true });
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}
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Geometry { paths: out, text_rect: Rect::new(0.0, 0.0, w, h), handles: vec![], sites: vec![] }
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}
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}
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}
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/// Parse our custom path syntax (`M x y L x y C … Q … Z`).
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pub fn parse_path(d: &str) -> BezPath {
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let mut bp = BezPath::new();
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let toks: Vec<&str> = d.split(|c: char| c.is_whitespace() || c == ',').filter(|t| !t.is_empty()).collect();
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let mut i = 0;
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let num = |i: usize| toks.get(i).and_then(|t| t.parse::<f64>().ok()).filter(|v| v.is_finite());
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let mut started = false;
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while i < toks.len() {
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let t = toks.get(i).copied().unwrap_or("");
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match t {
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"M" => {
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if let (Some(x), Some(y)) = (num(i + 1), num(i + 2)) {
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bp.move_to((x, y));
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started = true;
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}
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i += 3;
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}
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"L" => {
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if let (Some(x), Some(y)) = (num(i + 1), num(i + 2)) {
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if !started {
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bp.move_to((x, y));
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started = true;
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} else {
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bp.line_to((x, y));
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}
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}
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i += 3;
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}
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"C" => {
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if let (Some(a), Some(b), Some(c), Some(d2), Some(e), Some(f)) =
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(num(i + 1), num(i + 2), num(i + 3), num(i + 4), num(i + 5), num(i + 6))
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&& started
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{
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bp.curve_to((a, b), (c, d2), (e, f));
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}
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i += 7;
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}
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"Q" => {
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if let (Some(a), Some(b), Some(c), Some(d2)) = (num(i + 1), num(i + 2), num(i + 3), num(i + 4))
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&& started
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{
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bp.quad_to((a, b), (c, d2));
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}
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i += 5;
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}
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"Z" | "z" => {
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if started {
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bp.close_path();
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}
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i += 1;
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}
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_ => i += 1,
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}
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}
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bp
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}
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/// The transform a 3-D camera applies to shape `s` of size `w` x `h` (approximated by the affine
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/// map that fits it best), as drawn; `None` for no camera, and for groups, tables and charts.
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pub fn camera_turn(rctx: &Ctx, s: &Shape, w: f64, h: f64) -> Option<Affine> {
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if matches!(s.kind, ShapeKind::Group { .. } | ShapeKind::Table(_) | ShapeKind::Chart(_)) {
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return None;
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}
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let (e, _) = resolve::effects(rctx, s);
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e.as_ref().and_then(|e| e.raw3d.as_deref()).and_then(camera::from_raw).and_then(|c| camera::affine(&c, w, h))
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}
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/// The rectangle a picture's image occupies given its crop (fractions; negative = padding).
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pub fn crop_dest(bounds: Rect, crop: [f64; 4]) -> Rect {
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let [l, t, r, b] = crop.map(|v| if v.is_finite() { v.clamp(-10.0, 0.99) } else { 0.0 });
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let vis_w = (1.0 - l - r).max(1e-6);
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let vis_h = (1.0 - t - b).max(1e-6);
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let fw = bounds.width() / vis_w;
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let fh = bounds.height() / vis_h;
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Rect::new(bounds.x0 - l * fw, bounds.y0 - t * fh, bounds.x0 - l * fw + fw, bounds.y0 - t * fh + fh)
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}
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/// Whether a shape's border is drawn outside its outline: a picture's is, unless the picture is
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/// drawn in 3-D (a bevel seen through a 3-D scene), where PowerPoint centres it on the edge as on
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/// any shape (observed: an 18 pt border covers 9 pt of the picture then).
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pub(crate) fn border_outside(is_pic: bool, effects: Option<&Effects>) -> bool {
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is_pic && !effects.is_some_and(|e| e.bevel.is_some() && e.raw3d.as_deref().is_some_and(|r| r.contains("scene3d")))
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}
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/// The line that draws `line` (`lw` wide) outside a picture: twice as wide, so the half outside
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/// the outline is the border, with dashes kept their length. `None` for compound lines, whose
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/// bands would not survive the doubling (they stay centred on the outline).
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pub(crate) fn outside_line(line: &Line, lw: f64) -> Option<Line> {
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if line.compound.is_some_and(|c| c != deckcraft_model::style::Compound::Single) {
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return None;
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}
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let dash = line.dash.as_ref().map(|d| {
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let p = d.pattern();
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deckcraft_model::style::Dash::Custom {
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pattern: p.chunks(2).map(|c| (c.first().copied().unwrap_or(0.0) / 2.0, c.get(1).copied().unwrap_or(0.0) / 2.0)).collect(),
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}
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});
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Some(Line { width: Some(lw * 2.0), dash: dash.or_else(|| line.dash.clone()), ..line.clone() })
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}
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/// A shape's outline as it casts a shadow: its line, that line's placeholder colour and opacity,
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/// and the space it is stroked in (see `Renderer::line_space`).
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pub(crate) struct Caster<'a> {
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pub(crate) line: std::borrow::Cow<'a, Line>,
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pub(crate) ph: Option<Rgba>,
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pub(crate) alpha: f64,
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pub(crate) base: Affine,
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pub(crate) rel: Affine,
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}
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/// How opaque a fill is overall (`None` when nothing is filled): a solid colour's alpha, a
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/// gradient's mean stop alpha, otherwise opaque.
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pub(crate) fn fill_opacity(rctx: &Ctx, fill: &Option<Fill>, ph: Option<Rgba>) -> Option<f64> {
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match fill {
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None | Some(Fill::None) => None,
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Some(Fill::Solid { color: c }) => Some(rctx.color(c, ph).a as f64 / 255.0),
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Some(Fill::Gradient(g)) if !g.stops.is_empty() => {
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Some(g.stops.iter().map(|s| rctx.color(&s.color, ph).a as f64 / 255.0).sum::<f64>() / g.stops.len() as f64)
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}
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Some(_) => Some(1.0),
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}
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}
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/// A shadow's own scale and skew (`sx`, `sy`, `kx`, `ky`) in the shape's space, about the point
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/// of the shape's box its alignment names (`algn`: `b` is the middle of the bottom edge, `tl` the
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/// top-left corner…), as PowerPoint applies them: skewed, then scaled. A perspective shadow
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/// (`algn="b"`, `sy` 23%, `kx` -20°) so lies flat along the shape's bottom edge, not around its
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/// middle.
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pub(crate) fn shadow_local(sh: &deckcraft_model::style::Shadow, w: f64, h: f64) -> Affine {
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let (ax, ay) = match sh.align.as_str() {
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"tl" => (0.0, 0.0),
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"t" => (0.5, 0.0),
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"tr" => (1.0, 0.0),
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"l" => (0.0, 0.5),
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"r" => (1.0, 0.5),
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"bl" => (0.0, 1.0),
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"b" => (0.5, 1.0),
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"br" => (1.0, 1.0),
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_ => (0.5, 0.5),
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};
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let a = Vec2::new(w * ax, h * ay);
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let (tx, ty) = (sh.kx.to_radians().tan(), sh.ky.to_radians().tan());
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let k = Affine::new([sh.sx, sh.sy * ty, sh.sx * tx, sh.sy, 0.0, 0.0]);
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if !k.is_finite() {
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return Affine::IDENTITY;
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}
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Affine::translate(a) * k * Affine::translate(-a)
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}
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pub(crate) fn pre_translate(m: Affine, d: Vec2) -> Affine {
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Affine::translate(d) * m
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}
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pub(crate) fn scale_of(m: Affine) -> f64 {
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m.determinant().abs().sqrt()
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}
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pub(crate) fn blur(sigma: f64) -> Filter {
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Filter::from_primitive(FilterPrimitive::GaussianBlur { std_deviation: sigma.clamp(0.0, 500.0) as f32, edge_mode: EdgeMode::None })
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}
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+27
-2439
File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,132 @@
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use super::*;
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/// Animation state of one shape during a slide show or preview.
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#[derive(Clone, Debug)]
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pub struct ShapeState {
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pub visible: bool,
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pub opacity: f64,
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/// Applied in slide space around the shape's centre: translation (pt), scale, rotation (deg).
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pub offset: Vec2,
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pub scale: (f64, f64),
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pub rotate: f64,
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/// Reveal clip in shape-local unit space (0..1): l, t, r, b.
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pub clip: Option<[f64; 4]>,
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/// Colour override for emphasis effects (fill).
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pub tint: Option<Rgba>,
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/// Per-paragraph states of by-paragraph text builds (paragraph index, state).
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pub paras: Vec<(usize, ParaState)>,
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}
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impl Default for ShapeState {
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fn default() -> Self {
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ShapeState { visible: true, opacity: 1.0, offset: Vec2::ZERO, scale: (1.0, 1.0), rotate: 0.0, clip: None, tint: None, paras: vec![] }
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}
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}
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/// Animation state of one paragraph, relative to its shape.
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#[derive(Clone, Copy, Debug)]
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pub struct ParaState {
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pub visible: bool,
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pub opacity: f64,
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/// Translation in shape-local points.
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pub offset: Vec2,
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}
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impl Default for ParaState {
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fn default() -> Self {
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ParaState { visible: true, opacity: 1.0, offset: Vec2::ZERO }
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}
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}
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pub struct RenderOpts<'a> {
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/// Pixels per point.
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pub scale: f64,
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/// Editor view: placeholder prompts and dashed placeholder outlines.
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pub edit: bool,
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/// Draw shapes marked hidden (Selection pane) — the editor hides them like the show does.
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pub show_hidden: bool,
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/// Per-shape animation state.
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pub state: Option<&'a dyn Fn(ShapeId) -> ShapeState>,
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/// Don't draw these shapes (being edited in place, drawn by the UI).
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pub skip: &'a [ShapeId],
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/// Hide the text of this shape (the UI draws it while editing).
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pub skip_text: Option<ShapeId>,
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/// Text being edited: replace its prompt with gray markers on empty list paragraphs.
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/// Ignored outside editor rendering.
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pub editing_text: Option<ShapeId>,
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/// Animated GIF pictures and how far into their play they are (seconds); others show frame 1.
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pub gif_times: &'a [(ShapeId, f64)],
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/// Worker threads (0 = this thread; required when effects use filters).
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pub threads: u16,
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/// Translate the slide within the output (pixels) and output size override.
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pub offset: (f64, f64),
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pub size: Option<(u32, u32)>,
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/// Draw a background colour outside the slide (output larger than slide).
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pub clear: Option<Rgba>,
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/// Show this text in every date field instead of the date.
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pub date_text: Option<String>,
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/// The local date and time date fields show (`None`: the system clock).
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pub now: Option<DateTime>,
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/// Leave the slide background out (neither the white underlay nor the background fill), so
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/// only what is on the slide is drawn over transparency: PNG export with a transparent
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/// background. Shapes filled with the background (`useBgFill`) still show it.
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pub transparent_background: bool,
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}
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impl Default for RenderOpts<'_> {
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fn default() -> Self {
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RenderOpts {
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scale: 1.0,
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edit: false,
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show_hidden: false,
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state: None,
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skip: &[],
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skip_text: None,
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editing_text: None,
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gif_times: &[],
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threads: 0,
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offset: (0.0, 0.0),
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size: None,
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clear: None,
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date_text: None,
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now: None,
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transparent_background: false,
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}
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}
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}
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pub(crate) struct SlideFields {
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pub(crate) num: u32,
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/// Text for every date field instead of the date ([`RenderOpts::date_text`]).
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pub(crate) date: Option<String>,
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pub(crate) footer: String,
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/// The local date and time date fields show; `None`: they keep their saved text.
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pub(crate) now: Option<DateTime>,
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}
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impl SlideFields {
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pub(crate) fn new(num: u32, footer: String, opts: &RenderOpts) -> Self {
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SlideFields { num, date: opts.date_text.clone(), footer, now: opts.now.or_else(DateTime::now_local) }
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}
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}
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impl Fields for SlideFields {
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fn field(&self, kind: &str) -> Option<String> {
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self.field_in(kind, None)
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}
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fn field_in(&self, kind: &str, lang: Option<&str>) -> Option<String> {
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if kind == "slidenum" {
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return Some(self.num.to_string());
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}
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if datetime::is_date_field(kind) {
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// An automatic date: today's, in the format of its type. (A fixed date is plain text
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// in the slide's placeholder, not a field.)
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return self.date.clone().or_else(|| datetime::field_text(kind, lang, self.now?));
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}
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if kind == "footer" {
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return Some(self.footer.clone());
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}
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None
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}
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}
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@@ -0,0 +1,113 @@
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use super::*;
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/// Largest pixmap side we render (vello_cpu uses u16 sizes).
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pub const MAX_SIDE: u32 = 16_000;
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/// A rendered image: premultiplied RGBA8.
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#[derive(Clone, Debug, Default)]
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pub struct Image {
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pub width: u32,
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pub height: u32,
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pub pixels: Vec<u8>,
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}
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impl Image {
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/// Straight (unpremultiplied) RGBA.
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pub fn to_straight(&self) -> Vec<u8> {
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let mut out = self.pixels.clone();
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for px in out.as_chunks_mut::<4>().0 {
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let a = px.get(3).copied().unwrap_or(255) as u32;
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if a != 0 && a != 255 {
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for c in px.iter_mut().take(3) {
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*c = ((*c as u32 * 255 + a / 2) / a).min(255) as u8;
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}
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}
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}
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out
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}
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/// One pixel as straight (unpremultiplied) RGBA; `None` outside the image.
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pub fn straight_at(&self, x: u32, y: u32) -> Option<[u8; 4]> {
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if x >= self.width || y >= self.height {
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return None;
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}
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let i = (y as usize).checked_mul(self.width as usize)?.checked_add(x as usize)?.checked_mul(4)?;
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let [r, g, b, a] = <[u8; 4]>::try_from(self.pixels.get(i..i.checked_add(4)?)?).ok()?;
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if a == 0 || a == 255 {
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return Some([r, g, b, a]);
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}
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let unpremultiply = |c: u8| ((c as u32 * 255 + a as u32 / 2) / a as u32).min(255) as u8;
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Some([unpremultiply(r), unpremultiply(g), unpremultiply(b), a])
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}
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pub fn to_png(&self) -> Vec<u8> {
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let mut px = self.to_straight();
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px.resize(self.width as usize * self.height as usize * 4, 0);
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let Some(img) = image::RgbaImage::from_raw(self.width, self.height, px) else { return Vec::new() };
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let mut buf = Vec::new();
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if let Err(e) = img.write_to(&mut std::io::Cursor::new(&mut buf), image::ImageFormat::Png) {
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log::error!("PNG encode: {e}");
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return Vec::new();
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}
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||||
buf
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}
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||||
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/// PNG of this image whose `pHYs` chunk says `dpi` dots per inch.
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///
|
||||
/// Slide space is points, 72 per inch, so a render at `scale` pixels per point is
|
||||
/// [`dpi_for_scale`]`(scale)`. Without the chunk, Preview treats the pixels as 72 dpi and a
|
||||
/// Retina (2×) export opens at twice the slide's size.
|
||||
pub fn to_png_at(&self, dpi: f64) -> Vec<u8> {
|
||||
images::stamp_png_dpi(&self.to_png(), dpi)
|
||||
}
|
||||
|
||||
pub fn to_jpeg(&self, quality: u8) -> Vec<u8> {
|
||||
self.to_jpeg_at(quality, None)
|
||||
}
|
||||
|
||||
/// JPEG of this image. `dpi` is stored as JFIF density in dots per inch when it is in range.
|
||||
pub fn to_jpeg_at(&self, quality: u8, dpi: Option<f64>) -> Vec<u8> {
|
||||
let straight = self.to_straight();
|
||||
let rgb: Vec<u8> = straight.as_chunks::<4>().0.iter().flat_map(|p| [p[0], p[1], p[2]]).collect();
|
||||
let Some(img) = image::RgbImage::from_raw(self.width, self.height, rgb) else { return Vec::new() };
|
||||
let mut buf = Vec::new();
|
||||
let mut enc = image::codecs::jpeg::JpegEncoder::new_with_quality(&mut buf, quality.clamp(1, 100));
|
||||
if let Some(d) = dpi.and_then(dpi_u16) {
|
||||
enc.set_pixel_density(image::codecs::jpeg::PixelDensity::dpi(d));
|
||||
}
|
||||
if let Err(e) = img.write_with_encoder(enc) {
|
||||
log::error!("JPEG encode: {e}");
|
||||
return Vec::new();
|
||||
}
|
||||
buf
|
||||
}
|
||||
/// Pixel at (x, y) as straight RGBA.
|
||||
pub fn pixel(&self, x: u32, y: u32) -> [u8; 4] {
|
||||
let i = (y as usize * self.width as usize + x as usize) * 4;
|
||||
let p = self.pixels.get(i..i + 4).unwrap_or(&[0, 0, 0, 0]);
|
||||
let a = p.get(3).copied().unwrap_or(0) as u32;
|
||||
let un = |c: u8| (c as u32 * 255 + a / 2).checked_div(a).map(|v| v.min(255) as u8).unwrap_or(0);
|
||||
[un(p[0]), un(p[1]), un(p[2]), a as u8]
|
||||
}
|
||||
}
|
||||
|
||||
/// Dots per inch for a slide drawn at `pixels_per_point`.
|
||||
///
|
||||
/// A point is 1/72 inch. The default picture export uses 2 pixels per point, which is 144 dpi:
|
||||
/// the same pixels, at the slide's real size, on a Retina display.
|
||||
pub fn dpi_for_scale(pixels_per_point: f64) -> f64 {
|
||||
if !pixels_per_point.is_finite() || pixels_per_point <= 0.0 {
|
||||
return 72.0;
|
||||
}
|
||||
(pixels_per_point * 72.0).clamp(1.0, 10_000.0)
|
||||
}
|
||||
|
||||
fn dpi_u16(dpi: f64) -> Option<u16> {
|
||||
if !dpi.is_finite() || !(1.0..=f64::from(u16::MAX)).contains(&dpi) {
|
||||
return None;
|
||||
}
|
||||
Some(dpi.round() as u16)
|
||||
}
|
||||
|
||||
/// Resolution a PNG (`pHYs`) or JPEG (JFIF) records, in whole dots per inch.
|
||||
pub fn image_dpi(bytes: &[u8]) -> Option<(f64, f64)> {
|
||||
images::dpi(bytes)
|
||||
}
|
||||
File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,230 @@
|
||||
use super::opts::{RenderOpts, SlideFields};
|
||||
use super::raster::{Image, MAX_SIDE};
|
||||
use super::renderer::{Frame, RENDERER, Renderer};
|
||||
use super::*;
|
||||
|
||||
static PANICS: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(0);
|
||||
|
||||
fn note_panic() {
|
||||
PANICS.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
|
||||
}
|
||||
|
||||
/// Render panics caught (and drawn as blank) since start; soak tests require it to stay 0.
|
||||
pub fn panics_caught() -> u64 {
|
||||
PANICS.load(std::sync::atomic::Ordering::Relaxed)
|
||||
}
|
||||
|
||||
/// Does anything on this slide (or its layout/master graphics) use blur-based effects?
|
||||
pub fn needs_filters(pres: &Presentation, slide: &Slide) -> bool {
|
||||
let Some(rctx) = Ctx::for_slide(pres, slide) else { return false };
|
||||
let mut any = false;
|
||||
let mut check = |shapes: &[Shape]| {
|
||||
deckcraft_model::walk(shapes, &mut |s, _| {
|
||||
if any {
|
||||
return;
|
||||
}
|
||||
let (e, _) = resolve::effects(&rctx, s);
|
||||
if e.is_some_and(|e| !e.is_empty()) || text_has_effects(&rctx, s) {
|
||||
any = true;
|
||||
}
|
||||
});
|
||||
};
|
||||
check(&slide.shapes);
|
||||
if let Some(l) = rctx.layout {
|
||||
check(&l.shapes);
|
||||
}
|
||||
check(&rctx.master.shapes);
|
||||
any
|
||||
}
|
||||
|
||||
/// Does the shape's text have a shadow or glow (on a run, in its list style, or in the master's
|
||||
/// text styles it inherits)? Such text is blurred, which needs filters.
|
||||
fn text_has_effects(rctx: &Ctx, s: &Shape) -> bool {
|
||||
use deckcraft_model::text::{ListStyle, RunProps};
|
||||
let fx = |r: &RunProps| r.shadow.as_ref().is_some_and(|s| !s.inner) || r.glow.as_ref().is_some_and(|g| g.radius > 0.0);
|
||||
let styled = |l: &ListStyle| l.levels.iter().flatten().any(|lv| fx(&lv.run));
|
||||
let Some(t) = &s.text else { return false };
|
||||
t.paragraphs.iter().any(|p| p.runs.iter().any(|r| fx(&r.props)) || fx(&p.end_props))
|
||||
|| styled(&t.list_style)
|
||||
|| styled(&rctx.master.title_style)
|
||||
|| styled(&rctx.master.body_style)
|
||||
|| styled(&rctx.master.other_style)
|
||||
}
|
||||
|
||||
/// Render slide `index` at `opts.scale` pixels per point. A panic inside the renderer becomes a
|
||||
/// blank image (logged), never a crash.
|
||||
pub fn render_slide(pres: &Presentation, index: usize, opts: &RenderOpts) -> Image {
|
||||
render_slide_drawn(pres, index, opts).0
|
||||
}
|
||||
|
||||
/// [`render_slide`], also returning how far the drawing reached, in slide space (at least the
|
||||
/// slide; off it, what the shapes, their effects and their text drew, the parts outside the output
|
||||
/// included). The editor grows its pasteboard to it ([`pasteboard_region`]).
|
||||
pub fn render_slide_drawn(pres: &Presentation, index: usize, opts: &RenderOpts) -> (Image, Rect) {
|
||||
let page = Rect::new(0.0, 0.0, pres.slide_size.width, pres.slide_size.height);
|
||||
let Some(slide) = pres.slides.get(index) else { return (Image::default(), page) };
|
||||
match std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| {
|
||||
RENDERER.with(|r| {
|
||||
let mut r = r.borrow_mut();
|
||||
r.drawn = None;
|
||||
let img = r.slide(pres, slide, index, opts);
|
||||
(img, r.drawn.take())
|
||||
})
|
||||
})) {
|
||||
Ok((img, drawn)) => {
|
||||
let k = opts.scale;
|
||||
let to_slide =
|
||||
|d: Rect| Rect::new((d.x0 - opts.offset.0) / k, (d.y0 - opts.offset.1) / k, (d.x1 - opts.offset.0) / k, (d.y1 - opts.offset.1) / k);
|
||||
let extent = match drawn {
|
||||
Some(d) if k.is_finite() && k > 0.0 && to_slide(d).is_finite() => page.union(to_slide(d)),
|
||||
_ => page,
|
||||
};
|
||||
(img, extent)
|
||||
}
|
||||
Err(_) => {
|
||||
log::error!("rendering slide {index} panicked; showing a blank slide");
|
||||
note_panic();
|
||||
RENDERER.with(|r| *r.borrow_mut() = Renderer::default());
|
||||
let (w, h) = output_size(pres, opts);
|
||||
(Image { width: w as u32, height: h as u32, pixels: vec![255; w as usize * h as usize * 4] }, page)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Which part of a slide [`render_slide_part`] draws.
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
pub enum SlidePart {
|
||||
/// The background fill with the master and layout graphics.
|
||||
Backdrop,
|
||||
/// The slide's own shapes over transparency.
|
||||
Content,
|
||||
}
|
||||
|
||||
/// Render one part of slide `index` (transitions that move the contents over the backgrounds).
|
||||
/// A panic inside the renderer becomes a transparent image (logged), never a crash.
|
||||
pub fn render_slide_part(pres: &Presentation, index: usize, part: SlidePart, opts: &RenderOpts) -> Image {
|
||||
let Some(slide) = pres.slides.get(index) else { return Image::default() };
|
||||
match std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| RENDERER.with(|r| r.borrow_mut().slide_part(pres, slide, index, part, opts)))) {
|
||||
Ok(img) => img,
|
||||
Err(_) => {
|
||||
log::error!("rendering part of slide {index} panicked; showing nothing");
|
||||
note_panic();
|
||||
RENDERER.with(|r| *r.borrow_mut() = Renderer::default());
|
||||
let (w, h) = output_size(pres, opts);
|
||||
Image { width: w as u32, height: h as u32, pixels: vec![0; w as usize * h as usize * 4] }
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Render a frame between slides `old` and `new` (indices into `pres.slides`), e.g. of Morph: the
|
||||
/// backdrop (background, master and layout graphics) of `old` cross-fading into that of `new` by
|
||||
/// `mix` (0..1), then `shapes` in order, each resolved against the slide it comes from (`true`:
|
||||
/// `old`). Pairs of shapes in `text` draw their boxes as usual but their texts morph by words or
|
||||
/// characters ([`TextMorph`]), on top of the later shape of the pair. Shapes listed in `paths` draw
|
||||
/// an outline morphing from another geometry into their own ([`PathMorph`]). `opts.state` applies
|
||||
/// to `shapes` only.
|
||||
pub fn render_blend(
|
||||
pres: &Presentation,
|
||||
old: usize,
|
||||
new: usize,
|
||||
mix: f64,
|
||||
shapes: &[(Shape, bool)],
|
||||
text: &[TextMorph],
|
||||
paths: &[PathMorph],
|
||||
opts: &RenderOpts,
|
||||
) -> Image {
|
||||
let (Some(a), Some(b)) = (pres.slides.get(old), pres.slides.get(new)) else { return Image::default() };
|
||||
match std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| {
|
||||
RENDERER.with(|r| r.borrow_mut().blend(pres, (a, old), (b, new), mix, shapes, text, paths, opts))
|
||||
})) {
|
||||
Ok(img) => img,
|
||||
Err(_) => {
|
||||
log::error!("rendering a frame between slides {old} and {new} panicked; showing the new slide");
|
||||
note_panic();
|
||||
RENDERER.with(|r| *r.borrow_mut() = Renderer::default());
|
||||
render_slide(pres, new, opts)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Render a layout (Slide Master view thumbnail and canvas).
|
||||
pub fn render_layout(pres: &Presentation, master: usize, layout: Option<usize>, opts: &RenderOpts) -> Image {
|
||||
match std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| RENDERER.with(|r| r.borrow_mut().layout(pres, master, layout, opts)))) {
|
||||
Ok(img) => img,
|
||||
Err(_) => {
|
||||
log::error!("rendering a layout panicked; showing a blank image");
|
||||
note_panic();
|
||||
RENDERER.with(|r| *r.borrow_mut() = Renderer::default());
|
||||
Image::default()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub(crate) fn output_size(pres: &Presentation, opts: &RenderOpts) -> (u16, u16) {
|
||||
let (w, h) = opts
|
||||
.size
|
||||
.unwrap_or(((pres.slide_size.width * opts.scale).round().max(1.0) as u32, (pres.slide_size.height * opts.scale).round().max(1.0) as u32));
|
||||
(w.clamp(1, MAX_SIDE) as u16, h.clamp(1, MAX_SIDE) as u16)
|
||||
}
|
||||
|
||||
/// Render `ids` together onto a transparent canvas, in their slide positions (copy as a picture).
|
||||
pub fn render_shapes(pres: &Presentation, slide: &Slide, ids: &[ShapeId], scale: f64) -> Option<Image> {
|
||||
if ids.is_empty() || !scale.is_finite() || scale <= 0.0 {
|
||||
return None;
|
||||
}
|
||||
let rctx = Ctx::for_slide(pres, slide)?;
|
||||
let mut items = Vec::new();
|
||||
let mut bounds: Option<Rect> = None;
|
||||
for id in ids.iter().take(256) {
|
||||
let Some(s) = slide.shape(*id) else { continue };
|
||||
let b = resolve::xfrm(&rctx, s).bounds();
|
||||
if !b.width().is_finite() || !b.height().is_finite() || b.width() < 0.0 || b.height() < 0.0 {
|
||||
continue;
|
||||
}
|
||||
bounds = Some(match bounds {
|
||||
Some(u) => u.union(b),
|
||||
None => b,
|
||||
});
|
||||
items.push(s);
|
||||
}
|
||||
let b = bounds?.inflate(8.0, 8.0);
|
||||
if !(b.width() > 0.0 && b.height() > 0.0 && b.width().is_finite() && b.height().is_finite()) {
|
||||
return None;
|
||||
}
|
||||
let fit = (2048.0 / b.width().max(b.height())).min(scale);
|
||||
if !(fit.is_finite() && fit > 0.0) {
|
||||
return None;
|
||||
}
|
||||
let w = (b.width() * fit).ceil().clamp(1.0, 2048.0) as u16;
|
||||
let h = (b.height() * fit).ceil().clamp(1.0, 2048.0) as u16;
|
||||
let mut ctx = RenderContext::new_with(w, h, vello_cpu::RenderSettings { num_threads: 0, ..Default::default() });
|
||||
let opts = RenderOpts { scale: fit, ..Default::default() };
|
||||
let f = Frame { pres, opts: &opts, fields: SlideFields::new(1, String::new(), &opts) };
|
||||
let view = Affine::scale(fit) * Affine::translate(-b.origin().to_vec2());
|
||||
RENDERER.with(|r| {
|
||||
let mut r = r.borrow_mut();
|
||||
for s in items {
|
||||
r.shape(&mut ctx, &f, &rctx, s, view, 0);
|
||||
}
|
||||
Some(r.finish(ctx, w, h))
|
||||
})
|
||||
}
|
||||
|
||||
/// Render one shape alone onto a transparent canvas (drag previews, copy as picture).
|
||||
pub fn render_shape(pres: &Presentation, slide: &Slide, id: ShapeId, scale: f64) -> Option<Image> {
|
||||
let rctx = Ctx::for_slide(pres, slide)?;
|
||||
let s = slide.shape(id)?;
|
||||
let x = resolve::xfrm(&rctx, s);
|
||||
let b = x.bounds().inflate(8.0, 8.0);
|
||||
let w = (b.width() * scale).ceil().clamp(1.0, MAX_SIDE as f64) as u16;
|
||||
let h = (b.height() * scale).ceil().clamp(1.0, MAX_SIDE as f64) as u16;
|
||||
let mut ctx = RenderContext::new_with(w, h, vello_cpu::RenderSettings { num_threads: 0, ..Default::default() });
|
||||
let opts = RenderOpts { scale, ..Default::default() };
|
||||
let f = Frame { pres, opts: &opts, fields: SlideFields::new(1, String::new(), &opts) };
|
||||
let view = Affine::scale(scale) * Affine::translate(-b.origin().to_vec2());
|
||||
RENDERER.with(|r| {
|
||||
let mut r = r.borrow_mut();
|
||||
r.shape(&mut ctx, &f, &rctx, s, view, 0);
|
||||
Some(r.finish(ctx, w, h))
|
||||
})
|
||||
}
|
||||
@@ -0,0 +1,441 @@
|
||||
use super::geometry::{color, scale_of};
|
||||
use super::*;
|
||||
|
||||
/// Stroke `path` with `line`. A gradient line is laid out over `extent` (the untrimmed outline the
|
||||
/// line belongs to; `path` itself when `None`).
|
||||
#[allow(clippy::too_many_arguments)]
|
||||
pub(crate) fn stroke(
|
||||
ctx: &mut RenderContext,
|
||||
rctx: &Ctx,
|
||||
line: &Line,
|
||||
ph: Option<Rgba>,
|
||||
path: &BezPath,
|
||||
extent: Option<&BezPath>,
|
||||
m: Affine,
|
||||
lw: f64,
|
||||
alpha: f64,
|
||||
) {
|
||||
use deckcraft_model::style::{LineCap, LineJoin};
|
||||
let cap = match line.cap.unwrap_or_default() {
|
||||
LineCap::Flat => kurbo::Cap::Butt,
|
||||
LineCap::Round => kurbo::Cap::Round,
|
||||
LineCap::Square => kurbo::Cap::Square,
|
||||
};
|
||||
let join = match line.join.unwrap_or_default() {
|
||||
LineJoin::Round => kurbo::Join::Round,
|
||||
LineJoin::Bevel => kurbo::Join::Bevel,
|
||||
LineJoin::Miter => kurbo::Join::Miter,
|
||||
};
|
||||
// Hairlines stay visible at any zoom.
|
||||
let min_w = 0.5 / scale_of(m).max(1e-6);
|
||||
let sw = lw.max(min_w);
|
||||
// PowerPoint's default miter limit is 8 widths (`a:miter lim="800000"`).
|
||||
let mut sk = kurbo::Stroke::new(sw).with_caps(cap).with_join(join).with_miter_limit(8.0);
|
||||
// Square caps on a dashed line square off only the line's own two ends (where a dash is
|
||||
// drawn): each dash itself ends flat, as PowerPoint draws them.
|
||||
let mut square_ends = None;
|
||||
if let Some(d) = &line.dash {
|
||||
let pat: Vec<f64> = d.pattern().iter().map(|v| v * lw.max(0.75)).collect();
|
||||
let pat = dash_with_caps(pat, cap, sw);
|
||||
let pat = limit_dash_count(path, pat);
|
||||
if !pat.is_empty() && pat.iter().all(|v| *v > 0.0) {
|
||||
if cap == kurbo::Cap::Square {
|
||||
sk = sk.with_caps(kurbo::Cap::Butt);
|
||||
square_ends = Some(square_dash_ends(path, &pat, sw));
|
||||
}
|
||||
sk = sk.with_dashes(0.0, pat);
|
||||
}
|
||||
}
|
||||
ctx.set_transform(m);
|
||||
match &line.fill {
|
||||
Some(Fill::Solid { color: c }) => {
|
||||
ctx.set_paint(color(rctx.color(c, ph), alpha));
|
||||
}
|
||||
Some(Fill::Gradient(g)) if !g.stops.is_empty() => ctx.set_paint(line_gradient(rctx, g, ph, extent.unwrap_or(path), lw, alpha)),
|
||||
_ => ctx.set_paint(color(Rgba::BLACK, alpha)),
|
||||
}
|
||||
// Compound lines: each band stroked along the path moved to its place across the width.
|
||||
let compound = line.compound.unwrap_or_default();
|
||||
if compound != deckcraft_model::style::Compound::Single && lw * scale_of(m) >= 1.5 {
|
||||
let tolerance = 0.1 / scale_of(m).max(1e-6);
|
||||
for &(a, b) in compound::bands(compound) {
|
||||
let d = (-0.5 + (a + b) / 2.0) * lw;
|
||||
let mut band = sk.clone();
|
||||
band.width = (b - a) * lw;
|
||||
ctx.set_stroke(band);
|
||||
ctx.stroke_path(&compound::offset(path, d, tolerance));
|
||||
}
|
||||
return;
|
||||
}
|
||||
ctx.set_stroke(sk);
|
||||
ctx.stroke_path(path);
|
||||
if let Some(ends) = square_ends {
|
||||
ctx.fill_path(&ends);
|
||||
}
|
||||
}
|
||||
|
||||
/// The square caps of a dashed line drawn `width` wide with dash `pattern`: a half-width square
|
||||
/// past the start of each open sub-path (every dash pattern starts with a dash) and past its end
|
||||
/// when the pattern is in a dash there.
|
||||
fn square_dash_ends(path: &BezPath, pattern: &[f64], width: f64) -> BezPath {
|
||||
use kurbo::{ParamCurve, ParamCurveArclen};
|
||||
let mut out = BezPath::new();
|
||||
let period: f64 = pattern.iter().sum();
|
||||
let mut cap = |at: Point, dir: Vec2| {
|
||||
let n = Vec2::new(-dir.y, dir.x) * (width / 2.0);
|
||||
let back = dir * (width / 2.0);
|
||||
out.move_to(at + n);
|
||||
out.line_to(at + n + back);
|
||||
out.line_to(at - n + back);
|
||||
out.line_to(at - n);
|
||||
out.close_path();
|
||||
};
|
||||
let dir = |seg: &kurbo::PathSeg, t0: f64, t1: f64| {
|
||||
let d = seg.eval(t1) - seg.eval(t0);
|
||||
let d = if d.hypot() > 1e-9 { d } else { seg.end() - seg.start() };
|
||||
if d.hypot() > 1e-9 { Some(d.normalize()) } else { None }
|
||||
};
|
||||
let mut subs: Vec<(Vec<kurbo::PathSeg>, bool)> = vec![];
|
||||
let mut cur: Vec<kurbo::PathSeg> = vec![];
|
||||
let mut closed = false;
|
||||
let mut last = Point::ZERO;
|
||||
let mut start = Point::ZERO;
|
||||
for el in path.elements() {
|
||||
let seg = match *el {
|
||||
PathEl::MoveTo(p) => {
|
||||
if !cur.is_empty() {
|
||||
subs.push((std::mem::take(&mut cur), closed));
|
||||
}
|
||||
closed = false;
|
||||
last = p;
|
||||
start = p;
|
||||
continue;
|
||||
}
|
||||
PathEl::LineTo(p) => kurbo::PathSeg::Line(kurbo::Line::new(last, p)),
|
||||
PathEl::QuadTo(a, p) => kurbo::PathSeg::Quad(kurbo::QuadBez::new(last, a, p)),
|
||||
PathEl::CurveTo(a, b, p) => kurbo::PathSeg::Cubic(kurbo::CubicBez::new(last, a, b, p)),
|
||||
PathEl::ClosePath => {
|
||||
closed = true;
|
||||
last = start;
|
||||
continue;
|
||||
}
|
||||
};
|
||||
last = seg.end();
|
||||
cur.push(seg);
|
||||
}
|
||||
if !cur.is_empty() {
|
||||
subs.push((cur, closed));
|
||||
}
|
||||
for segs in subs.iter().filter(|(s, c)| !c && !s.is_empty()).map(|(s, _)| s) {
|
||||
let (Some(first), Some(end)) = (segs.first(), segs.last()) else { continue };
|
||||
if let Some(d) = dir(first, 1e-3, 0.0) {
|
||||
cap(first.start(), d);
|
||||
}
|
||||
let len: f64 = segs.iter().map(|s| s.arclen(1e-3)).sum();
|
||||
if !(period > 0.0 && len.is_finite()) {
|
||||
continue;
|
||||
}
|
||||
let mut pos = len % period;
|
||||
// Ending exactly on a period boundary is the end of a gap.
|
||||
let mut on = pos > period * 1e-6;
|
||||
for v in pattern.iter().cycle().take(pattern.len()) {
|
||||
if pos <= *v {
|
||||
break;
|
||||
}
|
||||
pos -= v;
|
||||
on = !on;
|
||||
}
|
||||
if on && let Some(d) = dir(end, 1.0 - 1e-3, 1.0) {
|
||||
cap(end.end(), d);
|
||||
}
|
||||
}
|
||||
out
|
||||
}
|
||||
|
||||
/// A gradient line's paint: laid out, as PowerPoint lays it, over the box the stroke covers (the
|
||||
/// path's bounds grown by half the line width), so a horizontal line's vertical gradient runs
|
||||
/// across its width.
|
||||
fn line_gradient(rctx: &Ctx, g: &deckcraft_model::style::Gradient, ph: Option<Rgba>, path: &BezPath, lw: f64, alpha: f64) -> peniko::Gradient {
|
||||
let bounds = path.bounding_box().inflate(lw / 2.0, lw / 2.0);
|
||||
let bounds = paint::tile_box(bounds, g.tile);
|
||||
let stops: Vec<(f64, Rgba)> = g.stops.iter().map(|s| (s.pos, rctx.color(&s.color, ph))).collect();
|
||||
paint::gradient(&g.shape, stops, bounds, alpha)
|
||||
}
|
||||
|
||||
/// A dash pattern (on, off, on, off… lengths) for a line drawn `width` wide with `cap`. As
|
||||
/// PowerPoint draws them, round caps sit inside each dash's length rather than adding to it: a
|
||||
/// "round dot" (`sysDot`, one width on and one off) is a row of separate circles, not a solid
|
||||
/// line. So each dash loses a width (half at each end, where the caps go) and each gap gains it; a
|
||||
/// dash no longer than the width becomes just its two caps. (Square-capped dashes end flat; see
|
||||
/// `square_dash_ends`.)
|
||||
pub(crate) fn dash_with_caps(mut pat: Vec<f64>, cap: kurbo::Cap, width: f64) -> Vec<f64> {
|
||||
if cap != kurbo::Cap::Round || !pat.len().is_multiple_of(2) || !(width.is_finite() && width > 0.0) {
|
||||
return pat;
|
||||
}
|
||||
for (i, v) in pat.iter_mut().enumerate() {
|
||||
*v = if i.is_multiple_of(2) { (*v - width).max(width * 1e-3) } else { *v + width };
|
||||
}
|
||||
pat
|
||||
}
|
||||
|
||||
/// The most dashes one stroke is cut into. Stroking expands every dash into its own outline, so a
|
||||
/// tiny dash on a huge shape (a 1 EMU-wide `custDash` on a 2147483647 EMU rectangle) would
|
||||
/// otherwise need gigabytes and abort the app when the slide is drawn. Past this count the
|
||||
/// pattern is scaled up evenly, which looks the same: the dashes are far below a pixel by then.
|
||||
pub(crate) const MAX_DASHES: f64 = 20_000.0;
|
||||
|
||||
pub(crate) fn limit_dash_count(path: &BezPath, pat: Vec<f64>) -> Vec<f64> {
|
||||
use kurbo::ParamCurveArclen;
|
||||
let period: f64 = pat.iter().sum();
|
||||
if !(period.is_finite() && period > 0.0) {
|
||||
return pat;
|
||||
}
|
||||
let len: f64 = path.segments().map(|s| s.arclen(1e-2)).sum();
|
||||
let dashes = len / period;
|
||||
if !len.is_finite() {
|
||||
return vec![];
|
||||
}
|
||||
if dashes <= MAX_DASHES {
|
||||
return pat;
|
||||
}
|
||||
let k = dashes / MAX_DASHES;
|
||||
pat.into_iter().map(|v| v * k).collect()
|
||||
}
|
||||
|
||||
fn end_points(path: &BezPath) -> Option<((Point, Point), (Point, Point))> {
|
||||
let els: Vec<PathEl> = path.elements().to_vec();
|
||||
let mut pts: Vec<Point> = vec![];
|
||||
for e in &els {
|
||||
match e {
|
||||
PathEl::MoveTo(p) | PathEl::LineTo(p) => pts.push(*p),
|
||||
PathEl::QuadTo(a, b) => {
|
||||
pts.push(*a);
|
||||
pts.push(*b);
|
||||
}
|
||||
PathEl::CurveTo(a, b, c) => {
|
||||
pts.push(*a);
|
||||
pts.push(*b);
|
||||
pts.push(*c);
|
||||
}
|
||||
PathEl::ClosePath => {}
|
||||
}
|
||||
}
|
||||
if pts.len() < 2 {
|
||||
return None;
|
||||
}
|
||||
let first = *pts.first()?;
|
||||
let second = pts.iter().skip(1).find(|p| (**p - first).hypot() > 1e-6).copied().unwrap_or(*pts.get(1)?);
|
||||
let last = *pts.last()?;
|
||||
let prev = pts.iter().rev().skip(1).find(|p| (**p - last).hypot() > 1e-6).copied().unwrap_or(*pts.get(pts.len() - 2)?);
|
||||
Some(((first, second), (last, prev)))
|
||||
}
|
||||
|
||||
/// An arrowhead's width and length for a line `lw` wide. PowerPoint sizes them in multiples of
|
||||
/// the line width (small 2, medium 3, large 5), but never smaller than for a 2 pt line.
|
||||
pub(crate) fn head_size(e: &deckcraft_model::style::LineEnd, lw: f64) -> (f64, f64) {
|
||||
let sz = |s: &str| match s {
|
||||
"sm" => 2.0,
|
||||
"lg" => 5.0,
|
||||
_ => 3.0,
|
||||
};
|
||||
let k = lw.max(2.0);
|
||||
(sz(&e.w) * k, sz(&e.len) * k)
|
||||
}
|
||||
|
||||
/// How far back from the tip an open arrowhead's legs (`lw` wide) meet along their centre lines:
|
||||
/// PowerPoint puts the outside of the point, not the legs' centre lines, on the line's end.
|
||||
fn open_arrow_setback(wl: f64, ll: f64, lw: f64) -> f64 {
|
||||
let half = (wl / 2.0).atan2(ll);
|
||||
if half.sin() > 1e-6 { (lw / 2.0 / half.sin()).min(ll) } else { 0.0 }
|
||||
}
|
||||
|
||||
/// How much of a `lw`-wide line to leave off at its start and end, under its arrowheads: up to
|
||||
/// a triangle's base, into a stealth arrow's notch far enough for its barbs to cover the line's
|
||||
/// corners, and to where an open arrow's legs meet. Ovals and diamonds sit on the end itself.
|
||||
pub(crate) fn head_trims(line: &Line, lw: f64) -> (f64, f64) {
|
||||
// A square cap reaches half a width past the line's end: leave that off too.
|
||||
let cap = if line.cap == Some(deckcraft_model::style::LineCap::Square) { lw / 2.0 } else { 0.0 };
|
||||
let trim = |e: &Option<deckcraft_model::style::LineEnd>| {
|
||||
let Some(e) = e else { return 0.0 };
|
||||
let (wl, ll) = head_size(e, lw);
|
||||
match e.kind.as_str() {
|
||||
"triangle" => ll + cap,
|
||||
"stealth" => (ll * (0.6 + 0.4 * lw / wl.max(1e-9))).min(ll) + cap,
|
||||
"arrow" => open_arrow_setback(wl, ll, lw.max(0.75)) + cap,
|
||||
_ => 0.0,
|
||||
}
|
||||
};
|
||||
(trim(&line.head), trim(&line.tail))
|
||||
}
|
||||
|
||||
/// `path` with `start` left off the beginning of its first sub-path and `end` off the end of its
|
||||
/// last (by arc length), where those are open. A sub-path shorter than its trims disappears.
|
||||
pub(crate) fn trim_ends(path: &BezPath, start: f64, end: f64) -> BezPath {
|
||||
use kurbo::{ParamCurve, ParamCurveArclen};
|
||||
const ACC: f64 = 1e-3;
|
||||
let mut subs: Vec<(Vec<kurbo::PathSeg>, bool)> = vec![];
|
||||
let (mut last, mut first) = (Point::ZERO, Point::ZERO);
|
||||
for el in path.elements() {
|
||||
let seg = match *el {
|
||||
PathEl::MoveTo(p) => {
|
||||
subs.push((vec![], false));
|
||||
last = p;
|
||||
first = p;
|
||||
continue;
|
||||
}
|
||||
PathEl::ClosePath => {
|
||||
if let Some(s) = subs.last_mut() {
|
||||
s.1 = true;
|
||||
}
|
||||
last = first;
|
||||
continue;
|
||||
}
|
||||
PathEl::LineTo(p) => kurbo::PathSeg::Line(kurbo::Line::new(last, p)),
|
||||
PathEl::QuadTo(a, p) => kurbo::PathSeg::Quad(kurbo::QuadBez::new(last, a, p)),
|
||||
PathEl::CurveTo(a, b, p) => kurbo::PathSeg::Cubic(kurbo::CubicBez::new(last, a, b, p)),
|
||||
};
|
||||
last = seg.end();
|
||||
if subs.is_empty() {
|
||||
subs.push((vec![], false));
|
||||
}
|
||||
if let Some(s) = subs.last_mut() {
|
||||
s.0.push(seg);
|
||||
}
|
||||
}
|
||||
if let Some((segs, false)) = subs.first_mut()
|
||||
&& start > 0.0
|
||||
{
|
||||
let mut left = start;
|
||||
let mut drop_count = 0;
|
||||
for (i, seg) in segs.iter().enumerate() {
|
||||
let l = seg.arclen(ACC);
|
||||
if l > left {
|
||||
let partial = seg.subsegment(seg.inv_arclen(left, ACC)..1.0);
|
||||
segs.drain(..i);
|
||||
segs[0] = partial;
|
||||
drop_count = 0;
|
||||
break;
|
||||
}
|
||||
left -= l;
|
||||
drop_count = i + 1;
|
||||
}
|
||||
if drop_count > 0 {
|
||||
segs.drain(..drop_count);
|
||||
}
|
||||
}
|
||||
if let Some((segs, false)) = subs.last_mut()
|
||||
&& end > 0.0
|
||||
{
|
||||
let mut left = end;
|
||||
while let Some(seg) = segs.last().copied() {
|
||||
let l = seg.arclen(ACC);
|
||||
if l > left {
|
||||
if let Some(s1) = segs.last_mut() {
|
||||
*s1 = seg.subsegment(0.0..seg.inv_arclen(l - left, ACC));
|
||||
}
|
||||
break;
|
||||
}
|
||||
left -= l;
|
||||
segs.pop();
|
||||
}
|
||||
}
|
||||
let mut out = BezPath::new();
|
||||
for (segs, closed) in subs {
|
||||
let Some(s0) = segs.first() else { continue };
|
||||
out.move_to(s0.start());
|
||||
for seg in &segs {
|
||||
match seg {
|
||||
kurbo::PathSeg::Line(l) => out.line_to(l.p1),
|
||||
kurbo::PathSeg::Quad(q) => out.quad_to(q.p1, q.p2),
|
||||
kurbo::PathSeg::Cubic(c) => out.curve_to(c.p1, c.p2, c.p3),
|
||||
}
|
||||
}
|
||||
if closed {
|
||||
out.close_path();
|
||||
}
|
||||
}
|
||||
out
|
||||
}
|
||||
|
||||
#[allow(clippy::too_many_arguments)]
|
||||
pub(crate) fn arrowheads(ctx: &mut RenderContext, rctx: &Ctx, line: &Line, ph: Option<Rgba>, geo: &Geometry, rel: Affine, m: Affine, lw: f64) {
|
||||
let Some(sp) = geo.paths.iter().find(|p| p.stroke) else { return };
|
||||
let Some(((a, a2), (b, b2))) = end_points(&sp.path) else { return };
|
||||
// The outline's ends in the space the arrowheads are sized and drawn in.
|
||||
let (a, a2, b, b2) = (rel * a, rel * a2, rel * b, rel * b2);
|
||||
let col = match &line.fill {
|
||||
Some(Fill::Solid { color: c }) => rctx.color(c, ph),
|
||||
_ => Rgba::BLACK,
|
||||
};
|
||||
// A gradient line's heads take the gradient where they are.
|
||||
let grad = match &line.fill {
|
||||
Some(Fill::Gradient(g)) if !g.stops.is_empty() => {
|
||||
let mut moved = sp.path.clone();
|
||||
moved.apply_affine(rel);
|
||||
Some(line_gradient(rctx, g, ph, &moved, lw, 1.0))
|
||||
}
|
||||
_ => None,
|
||||
};
|
||||
let set_paint = |ctx: &mut RenderContext| match &grad {
|
||||
Some(g) => ctx.set_paint(g.clone()),
|
||||
None => ctx.set_paint(color(col, 1.0)),
|
||||
};
|
||||
for (end, tip, from) in [(&line.head, a, a2), (&line.tail, b, b2)] {
|
||||
let Some(e) = end else { continue };
|
||||
if e.kind == "none" {
|
||||
continue;
|
||||
}
|
||||
let (wl, ll) = head_size(e, lw);
|
||||
let dir = (tip - from).normalize();
|
||||
if !dir.x.is_finite() {
|
||||
continue;
|
||||
}
|
||||
let n = Vec2::new(-dir.y, dir.x);
|
||||
let base = tip - dir * ll;
|
||||
let mut p = BezPath::new();
|
||||
match e.kind.as_str() {
|
||||
"oval" => {
|
||||
let c = kurbo::Ellipse::new(tip, (ll / 2.0, wl / 2.0), dir.y.atan2(dir.x));
|
||||
p = c.to_path(0.05);
|
||||
}
|
||||
"diamond" => {
|
||||
p.move_to(tip + dir * ll / 2.0);
|
||||
p.line_to(tip + n * wl / 2.0);
|
||||
p.line_to(tip - dir * ll / 2.0);
|
||||
p.line_to(tip - n * wl / 2.0);
|
||||
p.close_path();
|
||||
}
|
||||
"stealth" => {
|
||||
p.move_to(tip);
|
||||
p.line_to(base + n * wl / 2.0);
|
||||
p.line_to(tip - dir * ll * 0.6);
|
||||
p.line_to(base - n * wl / 2.0);
|
||||
p.close_path();
|
||||
}
|
||||
"arrow" => {
|
||||
// Legs the line's width with round ends, meeting in a sharp point whose outside is
|
||||
// on the line's end.
|
||||
let leg = lw.max(0.75);
|
||||
let back = dir * open_arrow_setback(wl, ll, leg);
|
||||
let mut o = BezPath::new();
|
||||
o.move_to(base + n * wl / 2.0 - back);
|
||||
o.line_to(tip - back);
|
||||
o.line_to(base - n * wl / 2.0 - back);
|
||||
ctx.set_transform(m);
|
||||
set_paint(ctx);
|
||||
ctx.set_stroke(kurbo::Stroke::new(leg).with_join(kurbo::Join::Miter).with_miter_limit(100.0).with_caps(kurbo::Cap::Round));
|
||||
ctx.stroke_path(&o);
|
||||
continue;
|
||||
}
|
||||
_ => {
|
||||
p.move_to(tip);
|
||||
p.line_to(base + n * wl / 2.0);
|
||||
p.line_to(base - n * wl / 2.0);
|
||||
p.close_path();
|
||||
}
|
||||
}
|
||||
ctx.set_transform(m);
|
||||
set_paint(ctx);
|
||||
ctx.fill_path(&p);
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,318 @@
|
||||
use super::geometry::{blur, color, pre_translate, scale_of};
|
||||
use super::opts::ParaState;
|
||||
use super::*;
|
||||
|
||||
/// The prompt shown in an empty placeholder, formatted like its content would be.
|
||||
pub(crate) fn prompt_body(rctx: &Ctx, s: &Shape, kind: PhType) -> TextBody {
|
||||
// Layout/master prompt text when the layout supplies a custom one.
|
||||
let (lp, _) = resolve::parents(rctx, s);
|
||||
let custom = lp.and_then(|l| l.ph.as_ref().filter(|p| p.has_custom_prompt).and(l.text.as_ref())).filter(|t| !t.is_empty());
|
||||
if let Some(t) = custom {
|
||||
return t.clone();
|
||||
}
|
||||
if matches!(rctx.owner, resolve::Owner::Layout | resolve::Owner::Master) {
|
||||
return TextBody::default();
|
||||
}
|
||||
let txt = kind.prompt();
|
||||
if txt.is_empty() || kind.is_footer_kind() {
|
||||
return TextBody::default();
|
||||
}
|
||||
let mut t = TextBody::from_text(txt);
|
||||
if matches!(kind, PhType::Picture | PhType::Chart | PhType::Table | PhType::Media | PhType::Diagram | PhType::ClipArt) {
|
||||
t.body.anchor = Some(deckcraft_model::text::Anchor::Bottom);
|
||||
if let Some(p) = t.paragraphs.first_mut() {
|
||||
p.props.align = Some(deckcraft_model::text::Align::Center);
|
||||
p.props.bullet = Some(deckcraft_model::text::Bullet::None);
|
||||
p.props.margin_left = Some(0.0);
|
||||
p.props.indent = Some(0.0);
|
||||
for r in &mut p.runs {
|
||||
r.props.size = Some(14.0);
|
||||
}
|
||||
}
|
||||
}
|
||||
t
|
||||
}
|
||||
|
||||
thread_local! {
|
||||
static GLYPH_CACHE: std::cell::RefCell<HashMap<(u32, u32), Arc<BezPath>>> = std::cell::RefCell::new(HashMap::new());
|
||||
}
|
||||
|
||||
pub(crate) fn glyph(face: &deckcraft_fonts::FontFace, gid: u32) -> Arc<BezPath> {
|
||||
let key = (face.id(), gid);
|
||||
if let Some(p) = GLYPH_CACHE.with(|c| c.borrow().get(&key).cloned()) {
|
||||
return p;
|
||||
}
|
||||
let p = FontDb::global().outline(face, gid);
|
||||
GLYPH_CACHE.with(|c| {
|
||||
let mut c = c.borrow_mut();
|
||||
if c.len() > 200_000 {
|
||||
c.clear();
|
||||
}
|
||||
c.insert(key, p.clone());
|
||||
});
|
||||
p
|
||||
}
|
||||
|
||||
/// Draw a text body into shape space `m` within the text rect.
|
||||
pub fn draw_text(ctx: &mut RenderContext, rctx: &Ctx, s: &Shape, body: &TextBody, tr: Rect, m: Affine, fields: &dyn Fields, prompt: Option<Rgba>) {
|
||||
let l = deckcraft_text::layout(rctx, s, body, &Opts { rect: tr, fields, prompt_color: prompt, no_shrink: false });
|
||||
draw_layout(ctx, &l, tr, m);
|
||||
}
|
||||
|
||||
/// Add transient list markers to an editor layout, using the document's own bullet glyphs.
|
||||
pub(crate) fn preview_empty_bullets(l: &mut deckcraft_text::TextLayout) {
|
||||
for mut run in l.empty_bullets.drain(..) {
|
||||
run.color = Rgba::rgb(0xB3, 0xB3, 0xB3);
|
||||
run.alpha = 1.0;
|
||||
l.runs.push(run);
|
||||
}
|
||||
}
|
||||
|
||||
/// Where text laid out in text rect `tr` is drawn, for a shape drawn with `m` (shape-local →
|
||||
/// output): `m`, without mirroring, then the layout's `rotation` about the rect's centre.
|
||||
///
|
||||
/// Flips mirror a shape's geometry, never its text. When `m` reflects (flipH or flipV, the shape's
|
||||
/// own or a group's) the text rect keeps its mirrored place and the text is mirrored back about
|
||||
/// the rect's centre: a flipH shape's text stays readable and a flipV shape's text is turned 180°
|
||||
/// (both flips: 180°), as in PowerPoint. Rendering, hit testing and the caret all use this.
|
||||
pub fn text_transform(m: Affine, tr: Rect, rotation: f64) -> Affine {
|
||||
let c = tr.center().to_vec2();
|
||||
let mut t = m;
|
||||
if m.determinant() < 0.0 && c.is_finite() {
|
||||
t = t * Affine::translate(c) * Affine::scale_non_uniform(-1.0, 1.0) * Affine::translate(-c);
|
||||
}
|
||||
if rotation != 0.0 && rotation.is_finite() && c.is_finite() {
|
||||
t = t * Affine::translate(c) * Affine::rotate(rotation.to_radians()) * Affine::translate(-c);
|
||||
}
|
||||
t
|
||||
}
|
||||
|
||||
/// The WordArt warp of `s`'s text over its text rectangle `tr`, if it has one DeckCraft draws.
|
||||
pub fn text_warp(rctx: &Ctx, s: &Shape, tr: Rect) -> Option<deckcraft_geom::warp::Warp> {
|
||||
let bp = resolve::body(rctx, s);
|
||||
let name = bp.warp.as_deref()?;
|
||||
deckcraft_geom::warp::warp(name, &bp.warp_adj, tr)
|
||||
}
|
||||
|
||||
/// Draw an already laid-out text block.
|
||||
pub fn draw_layout(ctx: &mut RenderContext, l: &deckcraft_text::TextLayout, tr: Rect, m: Affine) {
|
||||
draw_layout_with(ctx, l, tr, m, &[]);
|
||||
}
|
||||
|
||||
/// Draw a laid-out text block with per-paragraph animation states.
|
||||
pub fn draw_layout_with(ctx: &mut RenderContext, l: &deckcraft_text::TextLayout, tr: Rect, m: Affine, paras: &[(usize, ParaState)]) {
|
||||
let para = |i: usize| paras.iter().find(|(p, _)| *p == i).map(|(_, s)| *s).unwrap_or_default();
|
||||
let m = text_transform(m, tr, l.rotation);
|
||||
let deco = |ctx: &mut RenderContext, d: &deckcraft_text::Deco| {
|
||||
let ps = para(d.para);
|
||||
if !ps.visible || ps.opacity <= 0.001 {
|
||||
return;
|
||||
}
|
||||
ctx.set_transform(m * Affine::translate(ps.offset));
|
||||
ctx.set_paint(color(d.color, ps.opacity));
|
||||
fill_deco(ctx, d);
|
||||
};
|
||||
for d in l.decos.iter().filter(|d| d.behind) {
|
||||
deco(ctx, d);
|
||||
}
|
||||
// Text shadows, then glows, under all the text.
|
||||
for pass in [TextEffect::Shadow, TextEffect::Glow] {
|
||||
for run in &l.runs {
|
||||
let ps = para(run.para);
|
||||
if ps.visible && ps.opacity > 0.001 {
|
||||
text_effect(ctx, run, pass, m * Affine::translate(ps.offset), ps.opacity);
|
||||
}
|
||||
}
|
||||
}
|
||||
for run in &l.runs {
|
||||
if (run.alpha <= 0.0 || run.color.a == 0) && run.outline.is_none() {
|
||||
continue;
|
||||
}
|
||||
let ps = para(run.para);
|
||||
if !ps.visible || ps.opacity <= 0.001 {
|
||||
continue;
|
||||
}
|
||||
let m = m * Affine::translate(ps.offset);
|
||||
// A gradient fill starts over on every line and spans that line's text (from its top to
|
||||
// its bottom, from its first to its last character), as in PowerPoint.
|
||||
let mut grads: Vec<(usize, peniko::Gradient)> = Vec::new();
|
||||
for (gid, x, y) in &run.glyphs {
|
||||
let at = m * glyph_place(run, *gid, *x, *y);
|
||||
let Some(g) = run.gradient.as_ref().filter(|g| !g.stops.is_empty()) else {
|
||||
draw_glyph(ctx, run, *gid, at, ps.opacity);
|
||||
continue;
|
||||
};
|
||||
let li = line_at(l, run.para, *y);
|
||||
if !grads.iter().any(|(i, _)| *i == li) {
|
||||
let scheme = deckcraft_color::ColorScheme { name: String::new(), colors: [Rgba::BLACK; 12] };
|
||||
let stops = g.stops.iter().map(|s| (s.pos, s.color.resolve(&scheme, None))).collect();
|
||||
let bounds = l.lines.get(li).and_then(line_bounds).unwrap_or(tr);
|
||||
grads.push((li, paint::gradient(&g.shape, stops, bounds, run.alpha * ps.opacity)));
|
||||
}
|
||||
let fill = grads.iter().find(|(i, _)| *i == li).map(|(_, g)| (g, Affine::translate((-*x, -*y))));
|
||||
draw_glyph_with(ctx, run, *gid, at, ps.opacity, fill);
|
||||
}
|
||||
}
|
||||
for d in l.decos.iter().filter(|d| !d.behind) {
|
||||
deco(ctx, d);
|
||||
}
|
||||
}
|
||||
|
||||
/// Where glyph `gid` of `run` with its pen at (`x`, `y`) is drawn, in text space: there, turned a
|
||||
/// quarter turn back about its em box's centre when it stands upright in vertical text.
|
||||
pub(crate) fn glyph_place(run: &deckcraft_text::GlyphRun, gid: u32, x: f64, y: f64) -> Affine {
|
||||
let at = Affine::translate((x, y));
|
||||
match run.upright_centre(gid, x, y) {
|
||||
Some((cx, cy)) => Affine::translate((cx, cy)) * Affine::rotate(-std::f64::consts::FRAC_PI_2) * Affine::translate((-cx, -cy)) * at,
|
||||
None => at,
|
||||
}
|
||||
}
|
||||
|
||||
/// Fill an underline, strikethrough or highlight with the current paint and transform: its box,
|
||||
/// its dashes, or its zigzag stroked.
|
||||
pub(crate) fn fill_deco(ctx: &mut RenderContext, d: &deckcraft_text::Deco) {
|
||||
if let Some((pts, w)) = d.wave() {
|
||||
let mut path = BezPath::new();
|
||||
for (i, p) in pts.iter().enumerate() {
|
||||
if i == 0 {
|
||||
path.move_to(*p);
|
||||
} else {
|
||||
path.line_to(*p);
|
||||
}
|
||||
}
|
||||
ctx.set_stroke(kurbo::Stroke::new(w.max(0.01)));
|
||||
ctx.stroke_path(&path);
|
||||
return;
|
||||
}
|
||||
for r in d.pieces() {
|
||||
ctx.fill_rect(&r);
|
||||
}
|
||||
}
|
||||
|
||||
/// The line of paragraph `para` holding a glyph on baseline `y` (the nearest baseline).
|
||||
fn line_at(l: &deckcraft_text::TextLayout, para: usize, y: f64) -> usize {
|
||||
if let Some(&(first, count)) = l.para_lines.get(para) {
|
||||
if count == 0 {
|
||||
return 0;
|
||||
}
|
||||
let end = (first + count).min(l.lines.len());
|
||||
if first < end {
|
||||
return l.lines[first..end]
|
||||
.iter()
|
||||
.enumerate()
|
||||
.min_by(|a, b| (a.1.baseline - y).abs().total_cmp(&(b.1.baseline - y).abs()))
|
||||
.map(|(i, _)| first + i)
|
||||
.unwrap_or(0);
|
||||
}
|
||||
}
|
||||
l.lines
|
||||
.iter()
|
||||
.enumerate()
|
||||
.filter(|(_, li)| li.para == para)
|
||||
.min_by(|a, b| (a.1.baseline - y).abs().total_cmp(&(b.1.baseline - y).abs()))
|
||||
.map(|(i, _)| i)
|
||||
.unwrap_or(0)
|
||||
}
|
||||
|
||||
/// The box a line's text covers: its top and bottom, its first and last caret.
|
||||
pub(crate) fn line_bounds(li: &deckcraft_text::LineInfo) -> Option<Rect> {
|
||||
let (x0, x1) = li.caret_x.iter().fold((f64::INFINITY, f64::NEG_INFINITY), |(a, b), x| (a.min(*x), b.max(*x)));
|
||||
let r = Rect::new(x0, li.top, x1, li.bottom);
|
||||
(r.is_finite() && r.width() > 0.0 && r.height() > 0.0).then_some(r)
|
||||
}
|
||||
|
||||
#[derive(Clone, Copy, PartialEq)]
|
||||
enum TextEffect {
|
||||
Shadow,
|
||||
Glow,
|
||||
}
|
||||
|
||||
/// Draw `run`'s shadow or glow (if it has one) under its glyphs, placed by `m`.
|
||||
fn text_effect(ctx: &mut RenderContext, run: &deckcraft_text::GlyphRun, which: TextEffect, m: Affine, opacity: f64) {
|
||||
let Some(fx) = run.effects else { return };
|
||||
let k = run.size / run.face.upem.max(1.0);
|
||||
let skew = if run.fake_italic { Affine::new([1.0, 0.0, -0.2, 1.0, 0.0, 0.0]) } else { Affine::IDENTITY };
|
||||
let px = scale_of(m);
|
||||
let (c, sigma, offset, grow) = match (which, fx.shadow, fx.glow) {
|
||||
(TextEffect::Shadow, Some(s), _) => (s.color, s.blur * 0.5 * px, Vec2::new(s.dx, s.dy), 0.0),
|
||||
// Measured on PowerPoint's export: a text glow of radius r is solid to about a third of r
|
||||
// past the glyph's edge and fades out by about two thirds of r.
|
||||
(TextEffect::Glow, _, Some((gc, r))) => (gc, r * 0.15 * px, Vec2::ZERO, r * 0.68),
|
||||
_ => return,
|
||||
};
|
||||
let alpha = (c.a as f64 / 255.0) * opacity;
|
||||
if alpha <= 0.0 {
|
||||
return;
|
||||
}
|
||||
ctx.set_transform(Affine::IDENTITY);
|
||||
ctx.push_layer(None, None, Some(alpha as f32), None, Some(blur(sigma)));
|
||||
ctx.set_paint(color(c.with_alpha(255), 1.0));
|
||||
for (gid, x, y) in &run.glyphs {
|
||||
let path = glyph(&run.face, *gid);
|
||||
if path.elements().is_empty() {
|
||||
continue;
|
||||
}
|
||||
// The offset is in slide space: a shadow falls the same way whatever the text's rotation.
|
||||
let at = pre_translate(m * glyph_place(run, *gid, *x, *y), offset * px) * skew * Affine::scale(k);
|
||||
ctx.set_transform(at);
|
||||
ctx.fill_path(&path);
|
||||
if grow > 0.0 {
|
||||
ctx.set_stroke(kurbo::Stroke::new(grow / k.max(1e-9)).with_join(kurbo::Join::Round));
|
||||
ctx.stroke_path(&path);
|
||||
}
|
||||
}
|
||||
ctx.pop_layer();
|
||||
}
|
||||
|
||||
/// Draw glyph `gid` of `run` with its origin (on the baseline) mapped by `at`, faded by `opacity`.
|
||||
pub(crate) fn draw_glyph(ctx: &mut RenderContext, run: &deckcraft_text::GlyphRun, gid: u32, at: Affine, opacity: f64) {
|
||||
draw_glyph_with(ctx, run, gid, at, opacity, None);
|
||||
}
|
||||
|
||||
/// [`draw_glyph`], filled with `fill` (a gradient laid out in the text's space, and the map from
|
||||
/// the glyph's origin to that space) instead of the run's colour.
|
||||
fn draw_glyph_with(
|
||||
ctx: &mut RenderContext,
|
||||
run: &deckcraft_text::GlyphRun,
|
||||
gid: u32,
|
||||
at: Affine,
|
||||
opacity: f64,
|
||||
fill: Option<(&peniko::Gradient, Affine)>,
|
||||
) {
|
||||
let alpha = run.alpha * opacity;
|
||||
if (alpha <= 0.0 || run.color.a == 0) && run.outline.is_none() {
|
||||
return;
|
||||
}
|
||||
let k = run.size / run.face.upem.max(1.0);
|
||||
// Colour glyphs (emoji) paint their own colours; an outline (text outline effect) still
|
||||
// strokes the plain glyph below.
|
||||
if alpha > 0.0 && run.outline.is_none() && run.face.is_color() && colr::paint(ctx, &run.face, gid, at, k, run.color, alpha) {
|
||||
return;
|
||||
}
|
||||
let path = glyph(&run.face, gid);
|
||||
if path.elements().is_empty() {
|
||||
return;
|
||||
}
|
||||
let skew = if run.fake_italic { Affine::new([1.0, 0.0, -0.2, 1.0, 0.0, 0.0]) } else { Affine::IDENTITY };
|
||||
ctx.set_transform(at * skew * Affine::scale(k));
|
||||
if let Some((g, to_text)) = fill
|
||||
&& alpha > 0.0
|
||||
{
|
||||
ctx.set_paint(g.clone());
|
||||
ctx.set_paint_transform((skew * Affine::scale(k)).inverse() * to_text);
|
||||
ctx.fill_path(&path);
|
||||
ctx.reset_paint_transform();
|
||||
} else if alpha > 0.0 && run.color.a > 0 {
|
||||
ctx.set_paint(color(run.color, alpha));
|
||||
ctx.fill_path(&path);
|
||||
if run.fake_bold {
|
||||
ctx.set_stroke(kurbo::Stroke::new(run.face.upem * 0.025).with_join(kurbo::Join::Round));
|
||||
ctx.stroke_path(&path);
|
||||
}
|
||||
}
|
||||
if let Some((oc, ow)) = run.outline {
|
||||
ctx.set_paint(color(oc, opacity));
|
||||
ctx.set_stroke(kurbo::Stroke::new(ow / k.max(1e-9)).with_join(kurbo::Join::Round));
|
||||
ctx.stroke_path(&path);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user