Text: WordArt transforms (prstTxWarp) draw, and their adjusts round-trip (#312)

* Text warps: draw WordArt prstTxWarp presets, round-trip their adjusts

All 40 DrawingML text-warp presets now render instead of drawing flat text.
A warp is a list of bands over the shape's text rectangle (insets ignored):
fill bands stretch the ink of their lines between a top and a bottom guide
(positions by arc length, one horizontal scale for the whole text), follow
bands (arch, circle, button) set lines at natural size along an ellipse arc,
lines stacking outwards on parallel curves, with no wrapping. Lines are
shared over multi-band presets in order (ceil(n/k) per band).

The guide curves were fitted to PowerPoint renders of synthetic decks of
"I" bars (black-box observation, defaults and changed adjusts, 1-3 lines);
most presets match within about a point on a 420 x 200 pt box.

- geom: warp module (guides, presets, band mapping) with unit tests
- render: glyph outlines and underlines flattened, subdivided and mapped
- text: follow warps lay out without wrapping
- model/pptx: BodyProps.warp_adj read from and written to prstTxWarp/avLst

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* Text warps: bands with fewer lines keep the fuller band's text height

Multi-band fill warps (Deflate-Inflate, Button Pour) map a box as tall as
the tallest band's ink onto every band, centred on the band's own ink, as
PowerPoint does: a band holding one line next to a band of two keeps the
line at the same size instead of stretching it over the whole band.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
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16 changed files with 1515 additions and 11 deletions

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@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
| Date | What landed |
|---|---|
| 2026-10-12 | WordArt text warps (`prstTxWarp`): all 40 presets drawn, curves fitted to PowerPoint by observation; warp adjusts round-trip |
| 2026-10-10 | Progress docs restructured to the craftrules standard; full re-measure (breadth 79%, ready ~55%, mainstream ~53%, essentials ~62%, alpha). Landed: Animation Painter (#54), Morph geometry outlines (#27), animated GIF playback (#39), hyperlink colour and following links in the show (#37, #45), date fields in their own format (#36), flipped shapes keep readable text (#35), show transition fix (#46), start screen from the Home button (#49), MCP export lists PDF (#65), OmaStore manifest (#57) |
| 2026-10-09 | v0.4.0 released. UAX #9 bidi and Arabic shaping (#4), Morph with Words and Characters (#5), tables grow to fit and PDF cell text (#14), rotating log file (#7), DX12 default on Windows (#16), H.264/HEVC overflow hardening (#2), PPTX sniffing anywhere in the zip (#19) |
| 2026-10-08 | v0.2.0 and v0.3.0 released: Windows arm64, Flatpak aarch64, AppImage zsync updates, branded DMG |

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@ -8,6 +8,7 @@
pub mod morph;
pub mod preset;
pub mod warp;
pub use kurbo::{Affine, BezPath, PathEl, Point, Rect, Shape as KurboShape, Size, Vec2};
use serde::{Deserialize, Serialize};

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crates/geom/src/warp.rs Normal file
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@ -0,0 +1,773 @@
//! WordArt text warps (DrawingML `a:bodyPr/a:prstTxWarp`).
//!
//! A warp preset is a list of bands laid over the shape's text rectangle (insets are ignored).
//! Text lines are shared out over the bands in order (the first ⌈n/k⌉ lines to the first band
//! and so on). A band either
//! - stretches its lines between a top and a bottom guide ([`Band::Fill`]): the ink box of the
//! band's lines fills the band vertically (a band whose ink is shorter than the tallest band's
//! keeps the same scale, centred), and horizontally the text is scaled so that the
//! widest band is filled along the mean length of its guides (one scale for the whole text), or
//! - sets its lines at their natural size along one guide ([`Band::Follow`], arches and circles):
//! glyphs keep their size, are placed by arc length (aligned as in the paragraph, the whole
//! guide being the line's width: insets don't count) and stand on
//! the guide's left normal; lines further from the guide stack outwards. Lines that are longer
//! than the guide are shrunk to fit.
//!
//! Positions along a guide are by arc length; a fill band maps the same fraction of its top and
//! bottom guide's length and interpolates between them. The guide curves were derived from
//! observation: synthetic decks of `I` bars were drawn with PowerPoint and every curve fitted to
//! the measured bar ends (most fit within a point on a 420 × 200 pt box).
use kurbo::{Arc, BezPath, PathEl, Point, Rect, Vec2};
/// Flattening tolerance for guides, in points.
const TOL: f64 = 0.02;
/// A guide curve flattened to a polyline with cumulative arc lengths.
#[derive(Clone, Debug, Default)]
pub struct Guide {
pts: Vec<Point>,
cum: Vec<f64>,
closed: bool,
}
impl Guide {
fn from_points(raw: impl IntoIterator<Item = Point>, closed: bool) -> Guide {
let mut pts: Vec<Point> = Vec::new();
let mut cum: Vec<f64> = Vec::new();
for p in raw {
if !(p.x.is_finite() && p.y.is_finite()) {
continue;
}
match pts.last() {
Some(q) => {
let d = (p - *q).hypot();
if d > 1e-9 {
cum.push(cum.last().copied().unwrap_or(0.0) + d);
pts.push(p);
}
}
None => {
pts.push(p);
cum.push(0.0);
}
}
if pts.len() > 100_000 {
break;
}
}
Guide { pts, cum, closed }
}
/// A guide through `path` (any curves), flattened.
pub fn from_path(path: &BezPath, closed: bool) -> Guide {
let mut pts = Vec::new();
kurbo::flatten(path.iter(), TOL, |el| match el {
PathEl::MoveTo(p) | PathEl::LineTo(p) => pts.push(p),
_ => {}
});
Guide::from_points(pts, closed)
}
/// Total arc length.
pub fn length(&self) -> f64 {
self.cum.last().copied().unwrap_or(0.0)
}
/// Whether the guide is a closed loop (positions past its end wrap around).
pub fn is_closed(&self) -> bool {
self.closed
}
/// Point and unit tangent at arc length `s`. Open guides continue along their end tangents
/// past either end; closed guides wrap.
pub fn at(&self, s: f64) -> (Point, Vec2) {
let len = self.length();
let (Some(&first), Some(&last)) = (self.pts.first(), self.pts.last()) else {
return (Point::ZERO, Vec2::new(1.0, 0.0));
};
if self.pts.len() < 2 || len <= 1e-9 {
return (first, Vec2::new(1.0, 0.0));
}
let s = if s.is_finite() { s } else { 0.0 };
let s = if self.closed { s.rem_euclid(len) } else { s };
let seg = |i: usize| -> (Point, Point, f64) {
let a = self.pts.get(i).copied().unwrap_or(first);
let b = self.pts.get(i + 1).copied().unwrap_or(last);
(a, b, self.cum.get(i).copied().unwrap_or(0.0))
};
let n = self.pts.len();
let i = if s <= 0.0 {
0
} else if s >= len {
n - 2
} else {
self.cum.partition_point(|c| *c <= s).saturating_sub(1).min(n - 2)
};
let (a, b, c0) = seg(i);
let d = b - a;
let l = d.hypot();
let t = if l > 1e-12 { d / l } else { Vec2::new(1.0, 0.0) };
(a + t * (s - c0), t)
}
/// The parallel curve `d` points away on the left of the direction of travel (above a
/// guide running left to right).
pub fn offset(&self, d: f64) -> Guide {
let n = self.pts.len();
if n < 2 || !d.is_finite() || d == 0.0 {
return self.clone();
}
let unit = |i: usize| -> Vec2 {
let (a, b) = (self.pts.get(i).copied().unwrap_or(Point::ZERO), self.pts.get(i + 1).copied().unwrap_or(Point::ZERO));
let v = b - a;
let l = v.hypot();
if l > 1e-12 { v / l } else { Vec2::ZERO }
};
let pts = (0..n).map(|i| {
let before = if i > 0 {
unit(i - 1)
} else if self.closed {
unit(n - 2)
} else {
Vec2::ZERO
};
let after = if i + 1 < n {
unit(i)
} else if self.closed {
unit(0)
} else {
Vec2::ZERO
};
let t = before + after;
let l = t.hypot();
let t = if l > 1e-12 { t / l } else { Vec2::new(1.0, 0.0) };
self.pts.get(i).copied().unwrap_or(Point::ZERO) + Vec2::new(t.y, -t.x) * d
});
Guide::from_points(pts.collect::<Vec<_>>(), self.closed)
}
/// The point at fraction `t` of the length.
pub fn at_frac(&self, t: f64) -> Point {
self.at(t * self.length()).0
}
}
/// Which line of a follow band sits on its guide.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum LineAnchor {
/// The last line; earlier lines stack outwards (arch up, circle).
Last,
/// The first line; later lines stack below it (arch down).
First,
/// The middle of the band's lines.
Middle,
}
#[derive(Clone, Debug)]
pub enum Band {
/// Text stretched between two guides.
Fill { top: Guide, bottom: Guide },
/// Text at its natural size along a guide.
Follow { path: Guide, anchor: LineAnchor },
}
impl Band {
/// The length text is measured against: the mean of a fill band's guides.
pub fn length(&self) -> f64 {
match self {
Band::Fill { top, bottom } => (top.length() + bottom.length()) / 2.0,
Band::Follow { path, .. } => path.length(),
}
}
}
/// A resolved warp: its bands in shape-local points.
#[derive(Clone, Debug)]
pub struct Warp {
pub bands: Vec<Band>,
}
/// Presets whose text follows a guide at its natural size (no wrapping).
pub fn is_follow(name: &str) -> bool {
matches!(name, "textArchUp" | "textArchDown" | "textCircle" | "textButton")
}
/// Default adjust values of a warp preset (`adj`, or `adj1`, `adj2`); empty for unknown presets.
pub fn adjust_defaults(name: &str) -> &'static [f64] {
match name {
"textPlain" => &[50_000.0],
"textStop" => &[25_000.0],
"textTriangle" | "textTriangleInverted" => &[50_000.0],
"textChevron" => &[25_000.0],
"textChevronInverted" => &[75_000.0],
"textRingInside" | "textRingOutside" => &[60_000.0],
"textArchUp" | "textCircle" | "textButton" => &[10_800_000.0],
"textArchDown" => &[0.0],
"textArchUpPour" | "textCirclePour" | "textButtonPour" => &[10_800_000.0, 50_000.0],
"textArchDownPour" => &[0.0, 25_000.0],
"textCurveUp" | "textCurveDown" => &[45_977.0],
"textCanUp" => &[85_000.0],
"textCanDown" => &[14_286.0],
"textWave1" | "textWave2" => &[12_500.0, 0.0],
"textDoubleWave1" | "textWave4" => &[6_250.0, 0.0],
"textInflate" | "textDeflate" => &[18_750.0],
"textInflateBottom" => &[60_000.0],
"textDeflateBottom" | "textDeflateTop" => &[50_000.0],
"textInflateTop" => &[40_000.0],
"textDeflateInflate" => &[35_000.0],
"textDeflateInflateDeflate" => &[25_000.0],
"textFadeRight" | "textFadeLeft" | "textFadeUp" | "textFadeDown" => &[33_333.0],
"textSlantUp" => &[55_556.0],
"textSlantDown" => &[44_444.0],
"textCascadeUp" | "textCascadeDown" => &[44_444.0],
_ => &[],
}
}
/// Number of adjust values a warp preset takes.
pub fn adjust_count(name: &str) -> usize {
adjust_defaults(name).len()
}
/// Whether `name` is a warp preset DeckCraft draws.
pub fn is_supported(name: &str) -> bool {
!adjust_defaults(name).is_empty()
}
/// Segments of a guide in unit coordinates (x, y in 0..1 over the text rectangle).
#[derive(Clone, Copy, Debug)]
enum Seg {
M(f64, f64),
L(f64, f64),
Q(f64, f64, f64, f64),
C(f64, f64, f64, f64, f64, f64),
/// Elliptical arc: centre, radii, start and sweep in degrees (y down: positive = clockwise).
A(f64, f64, f64, f64, f64, f64),
}
enum Spec {
Fill(Vec<Seg>, Vec<Seg>),
Follow(Vec<Seg>, LineAnchor),
}
struct Adj<'a> {
raw: &'a [f64],
defaults: &'static [f64],
}
impl Adj<'_> {
fn raw(&self, i: usize) -> f64 {
self.raw.get(i).copied().filter(|v| v.is_finite()).or_else(|| self.defaults.get(i).copied()).unwrap_or(0.0)
}
/// Adjust `i` as a fraction (1/100 000), pinned to `lo..=hi` (fractions).
fn frac(&self, i: usize, lo: f64, hi: f64) -> f64 {
(self.raw(i) / 100_000.0).clamp(lo, hi)
}
/// Adjust `i` as an angle in degrees (1/60 000), in 0..360.
fn angle(&self, i: usize) -> f64 {
(self.raw(i) / 60_000.0).rem_euclid(360.0)
}
}
fn line(pts: &[(f64, f64)]) -> Vec<Seg> {
pts.iter().enumerate().map(|(i, &(x, y))| if i == 0 { Seg::M(x, y) } else { Seg::L(x, y) }).collect()
}
/// Quadratic from (0, y0) through control (0.5, c) to (1, y0).
fn quad(y0: f64, c: f64) -> Vec<Seg> {
vec![Seg::M(0.0, y0), Seg::Q(0.5, c, 1.0, y0)]
}
/// A sweep in (0, 360]: zero means a full turn.
fn turn(deg: f64) -> f64 {
let d = deg.rem_euclid(360.0);
if d < 1e-9 { 360.0 } else { d }
}
/// Arc of the ellipse inscribed in the rectangle, scaled by `s` about its centre.
fn ellipse(s: f64, start: f64, sweep: f64) -> Vec<Seg> {
vec![Seg::A(0.5, 0.5, 0.5 * s, 0.5 * s, start, sweep)]
}
/// The arch-up arc for adjust angle `a`: symmetric about the top (270°), clockwise.
fn arch_up(a: f64) -> (f64, f64) {
(a, turn(2.0 * (270.0 - a)))
}
/// The arch-down arc for adjust angle `a`: symmetric about the bottom (90°), counter-clockwise.
fn arch_down(a: f64) -> (f64, f64) {
(180.0 - a, -turn(180.0 - 2.0 * a))
}
/// The circle arc for adjust angle `a`: from `a` clockwise, symmetric about 0°.
fn circle(a: f64) -> (f64, f64) {
(a, turn(2.0 * (360.0 - a)))
}
/// One cubic wave period from x0 to x1 at height y: up first when `k` > 0 (y decreases).
fn wave(out: &mut Vec<Seg>, x0: f64, x1: f64, y: f64, k: f64) {
let l = x1 - x0;
out.push(Seg::C(x0 + l / 3.0, y - k, x0 + 2.0 * l / 3.0, y + k, x1, y));
}
/// Wave guides: `periods` cubic waves over the width, shifted apart by `shift` (fraction).
fn waves(a: f64, shift: f64, periods: usize, up_first: bool) -> Spec {
let d = 2.0 * shift;
let (top_x, bot_x) = if d >= 0.0 { ((0.0, 1.0 - d), (d, 1.0)) } else { ((-d, 1.0), (0.0, 1.0 + d)) };
let k = if up_first { a * 10.0 / 3.0 } else { -a * 10.0 / 3.0 };
let guide = |(x0, x1): (f64, f64), y: f64| {
let mut v = vec![Seg::M(x0, y)];
let n = periods.max(1) as f64;
for i in 0..periods.max(1) {
let f = i as f64;
wave(&mut v, x0 + (x1 - x0) * f / n, x0 + (x1 - x0) * (f + 1.0) / n, y, k);
}
v
};
Spec::Fill(guide(top_x, a), guide(bot_x, 1.0 - a))
}
fn spec(name: &str, a: &Adj) -> Option<Vec<Spec>> {
use Seg::*;
let fill = |t: Vec<Seg>, b: Vec<Seg>| vec![Spec::Fill(t, b)];
let top = || line(&[(0.0, 0.0), (1.0, 0.0)]);
let bottom = || line(&[(0.0, 1.0), (1.0, 1.0)]);
Some(match name {
"textPlain" => {
let d = 2.0 * (a.frac(0, 0.3, 0.7) - 0.5);
if d < 0.0 {
fill(line(&[(-d, 0.0), (1.0, 0.0)]), line(&[(0.0, 1.0), (1.0 + d, 1.0)]))
} else {
fill(line(&[(0.0, 0.0), (1.0 - d, 0.0)]), line(&[(d, 1.0), (1.0, 1.0)]))
}
}
"textStop" => {
let y = a.frac(0, 0.14286, 0.5);
let t = 1.0 / 3.0;
fill(line(&[(0.0, y), (t, 0.0), (1.0 - t, 0.0), (1.0, y)]), line(&[(0.0, 1.0 - y), (t, 1.0), (1.0 - t, 1.0), (1.0, 1.0 - y)]))
}
"textTriangle" => {
let y = a.frac(0, 0.0, 1.0);
fill(line(&[(0.0, y), (0.5, 0.0), (1.0, y)]), bottom())
}
"textTriangleInverted" => {
let y = a.frac(0, 0.0, 1.0);
fill(top(), line(&[(0.0, y), (0.5, 1.0), (1.0, y)]))
}
"textChevron" => {
let y = a.frac(0, 0.0, 0.5);
fill(line(&[(0.0, y), (0.5, 0.0), (1.0, y)]), line(&[(0.0, 1.0), (0.5, 1.0 - y), (1.0, 1.0)]))
}
"textChevronInverted" => {
let y = a.frac(0, 0.5, 1.0);
fill(line(&[(0.0, 0.0), (0.5, 1.0 - y), (1.0, 0.0)]), line(&[(0.0, y), (0.5, 1.0), (1.0, y)]))
}
"textFadeRight" => {
let y = a.frac(0, 0.0, 0.49999);
fill(line(&[(0.0, 0.0), (1.0, y)]), line(&[(0.0, 1.0), (1.0, 1.0 - y)]))
}
"textFadeLeft" => {
let y = a.frac(0, 0.0, 0.49999);
fill(line(&[(0.0, y), (1.0, 0.0)]), line(&[(0.0, 1.0 - y), (1.0, 1.0)]))
}
"textFadeUp" => {
let x = a.frac(0, 0.0, 0.49999);
fill(line(&[(x, 0.0), (1.0 - x, 0.0)]), bottom())
}
"textFadeDown" => {
let x = a.frac(0, 0.0, 0.49999);
fill(top(), line(&[(x, 1.0), (1.0 - x, 1.0)]))
}
"textSlantUp" => {
let y = a.frac(0, 0.44444, 1.0);
fill(line(&[(0.0, y), (1.0, 0.0)]), line(&[(0.0, 1.0), (1.0, 1.0 - y)]))
}
"textSlantDown" => {
let y = a.frac(0, 0.0, 0.55556);
fill(line(&[(0.0, 0.0), (1.0, 1.0 - y)]), line(&[(0.0, y), (1.0, 1.0)]))
}
"textCascadeUp" => {
let y = a.frac(0, 0.0, 1.0);
fill(line(&[(0.0, (1.0 - y) / 4.0), (1.0, 0.0)]), line(&[(0.0, 1.0), (1.0, y)]))
}
"textCascadeDown" => {
let y = a.frac(0, 0.0, 1.0);
fill(line(&[(0.0, 0.0), (1.0, (1.0 - y) / 4.0)]), line(&[(0.0, y), (1.0, 1.0)]))
}
"textInflate" => {
let y = a.frac(0, 0.0, 0.2);
fill(quad(y, -y), quad(1.0 - y, 1.0 + y))
}
"textDeflate" => {
let y = a.frac(0, 0.0, 0.375);
fill(quad(0.0, 2.0 * y), quad(1.0, 1.0 - 2.0 * y))
}
"textInflateBottom" => {
let y = a.frac(0, 0.6, 1.0);
fill(top(), quad(y, 1.0))
}
"textDeflateBottom" => {
let y = a.frac(0, 0.0625, 1.0);
fill(top(), quad(1.0, 2.0 * y - 1.0))
}
"textInflateTop" => {
let y = a.frac(0, 0.0, 0.5);
fill(quad(y, 0.0), bottom())
}
"textDeflateTop" => {
let y = a.frac(0, 0.0, 0.9375);
fill(quad(0.0, 2.0 * y), bottom())
}
"textDeflateInflate" => {
// The bands are split by a curve from mid-height up to `y`, with a gap of a tenth of
// a band's height.
let y = a.frac(0, 0.05, 0.95);
let g = 0.05;
vec![Spec::Fill(top(), quad(0.5 - g, 2.0 * y - 0.5 - g)), Spec::Fill(quad(0.5 + g, 2.0 * y - 0.5 + g), bottom())]
}
"textDeflateInflateDeflate" => {
let y = a.frac(0, 0.01, 1.0 / 3.0);
let g = 1.0 / 30.0;
let (t1, t2) = (1.0 / 3.0, 2.0 / 3.0);
let (c1, c2) = (2.0 * y - t1, 2.0 * (1.0 - y) - t2);
vec![
Spec::Fill(top(), quad(t1 - g, c1 - g)),
Spec::Fill(quad(t1 + g, c1 + g), quad(t2 - g, c2 - g)),
Spec::Fill(quad(t2 + g, c2 + g), bottom()),
]
}
"textCurveUp" | "textCurveDown" => {
let y = a.frac(0, 0.0, 0.56818);
let b = vec![M(0.0, 1.0 - 3.0 * y / 8.0), C(1.0 / 3.0, 1.0 + y / 8.0, 2.0 / 3.0, 1.0 + y / 8.0, 1.0, 1.0 - 3.0 * y / 8.0)];
let t = if name == "textCurveUp" {
vec![M(0.0, y), C(1.0 / 3.0, 1.25 * y, 2.0 / 3.0, 0.75 * y, 1.0, 0.0)]
} else {
vec![M(0.0, 0.0), C(1.0 / 3.0, 0.75 * y, 2.0 / 3.0, 1.25 * y, 1.0, y)]
};
fill(t, b)
}
"textCanUp" => {
let r = 1.0 - a.frac(0, 0.5, 1.0);
fill(vec![A(0.5, r, 0.5, r, 180.0, 180.0)], vec![A(0.5, 1.0, 0.5, r, 180.0, 180.0)])
}
"textCanDown" => {
let r = a.frac(0, 0.0, 0.5);
fill(vec![A(0.5, 0.0, 0.5, r, 180.0, -180.0)], vec![A(0.5, 1.0 - r, 0.5, r, 180.0, -180.0)])
}
"textRingInside" | "textRingOutside" => {
let h = a.frac(0, 0.5, 0.99);
let sweep = if name == "textRingInside" { 360.0 } else { -360.0 };
fill(vec![A(0.5, h / 2.0, 0.5, h / 2.0, 180.0, sweep)], vec![A(0.5, 1.0 - h / 2.0, 0.5, h / 2.0, 180.0, sweep)])
}
"textWave1" => vec![waves(a.frac(0, 0.0, 0.2), a.frac(1, -0.1, 0.1), 1, true)],
"textWave2" => vec![waves(a.frac(0, 0.0, 0.2), a.frac(1, -0.1, 0.1), 1, false)],
"textDoubleWave1" => vec![waves(a.frac(0, 0.0, 0.125), a.frac(1, -0.1, 0.1), 2, true)],
"textWave4" => vec![waves(a.frac(0, 0.0, 0.125), a.frac(1, -0.1, 0.1), 2, false)],
"textArchUp" => {
let (s, w) = arch_up(a.angle(0));
vec![Spec::Follow(ellipse(1.0, s, w), LineAnchor::Last)]
}
"textArchDown" => {
let (s, w) = arch_down(a.angle(0));
vec![Spec::Follow(ellipse(1.0, s, w), LineAnchor::First)]
}
"textCircle" => {
let (s, w) = circle(a.angle(0));
vec![Spec::Follow(ellipse(1.0, s, w), LineAnchor::Last)]
}
"textButton" => {
let t = a.angle(0);
let (s, w) = arch_up(t);
let half = 0.5 * t.to_radians().cos().abs();
vec![
Spec::Follow(ellipse(1.0, s, w), LineAnchor::Last),
Spec::Follow(line(&[(0.5 - half, 0.5), (0.5 + half, 0.5)]), LineAnchor::Middle),
Spec::Follow(ellipse(1.0, 360.0 - s, -w), LineAnchor::First),
]
}
"textArchUpPour" => {
let (s, w) = arch_up(a.angle(0));
let r = a.frac(1, 0.0, 0.99);
fill(ellipse(1.0, s, w), ellipse(r, s, w))
}
"textArchDownPour" => {
let (s, w) = arch_down(a.angle(0));
let r = a.frac(1, 0.0, 0.99);
fill(ellipse(r, s, w), ellipse(1.0, s, w))
}
"textCirclePour" => {
let (s, w) = circle(a.angle(0));
let r = a.frac(1, 0.0, 0.99);
fill(ellipse(1.0, s, w), ellipse(r, s, w))
}
"textButtonPour" => {
let (s, w) = arch_up(a.angle(0));
let r = a.frac(1, 0.0, 0.99);
// The middle band runs between chords of the inner ellipse halfway to its top and
// bottom.
let (dy, half) = (0.25 * r, 0.25 * r * 3f64.sqrt());
vec![
Spec::Fill(ellipse(1.0, s, w), ellipse(r, s, w)),
Spec::Fill(line(&[(0.5 - half, 0.5 - dy), (0.5 + half, 0.5 - dy)]), line(&[(0.5 - half, 0.5 + dy), (0.5 + half, 0.5 + dy)])),
Spec::Fill(ellipse(r, 360.0 - s, -w), ellipse(1.0, 360.0 - s, -w)),
]
}
_ => return None,
})
}
/// Build a guide from unit-space segments mapped onto `r`.
fn guide(segs: &[Seg], r: Rect) -> Guide {
let mut p = BezPath::new();
let mut started = false;
let mut closed = false;
for s in segs {
match *s {
Seg::M(x, y) => {
p.move_to((x, y));
started = true;
}
Seg::L(x, y) => {
if started {
p.line_to((x, y))
} else {
p.move_to((x, y))
}
started = true;
}
Seg::Q(cx, cy, x, y) => {
if started {
p.quad_to((cx, cy), (x, y));
}
}
Seg::C(x1, y1, x2, y2, x, y) => {
if started {
p.curve_to((x1, y1), (x2, y2), (x, y));
}
}
Seg::A(cx, cy, rx, ry, start, sweep) => {
let arc = Arc::new((cx, cy), (rx.max(0.0), ry.max(0.0)), start.to_radians(), sweep.to_radians(), 0.0);
let s0 = Point::new(cx + rx * start.to_radians().cos(), cy + ry * start.to_radians().sin());
if started {
p.line_to(s0);
} else {
p.move_to(s0);
}
started = true;
for el in arc.append_iter(1e-5) {
p.push(el);
}
closed = sweep.abs() >= 359.999;
}
}
}
let m = kurbo::Affine::new([r.width(), 0.0, 0.0, r.height(), r.x0, r.y0]);
p.apply_affine(m);
Guide::from_path(&p, closed)
}
/// The warp `name` with adjust values `adj` (raw guide values; missing ones take the defaults)
/// over text rectangle `rect`. `None` for unknown presets, `textNoShape` or a non-finite rect.
pub fn warp(name: &str, adj: &[f64], rect: Rect) -> Option<Warp> {
if ![rect.x0, rect.y0, rect.x1, rect.y1].iter().all(|v| v.is_finite()) {
return None;
}
let r = Rect::new(rect.x0.min(rect.x1), rect.y0.min(rect.y1), rect.x0.max(rect.x1), rect.y0.max(rect.y1));
let a = Adj { raw: adj, defaults: adjust_defaults(name) };
let specs = spec(name, &a)?;
let bands = specs
.into_iter()
.map(|s| match s {
Spec::Fill(t, b) => Band::Fill { top: guide(&t, r), bottom: guide(&b, r) },
Spec::Follow(p, anchor) => Band::Follow { path: guide(&p, r), anchor },
})
.collect();
Some(Warp { bands })
}
/// The band line `line` of `lines` goes to when there are `bands` bands: the first ⌈n/k⌉ lines
/// share the first band, and so on.
pub fn band_of_line(line: usize, lines: usize, bands: usize) -> usize {
if bands <= 1 || lines == 0 {
return 0;
}
// Band b holds lines ceil(b·n/k) .. ceil((b+1)·n/k).
(0..bands).rev().find(|&b| (b * lines).div_ceil(bands) <= line).unwrap_or(0)
}
/// One laid-out line as the warp sees it (layout coordinates, points).
#[derive(Clone, Copy, Debug)]
pub struct WarpLine {
/// Ink box of the line's glyphs; `None` for a line without ink.
pub ink: Option<Rect>,
/// Advance extent of the line (left, right).
pub extent: (f64, f64),
/// Reference height for follow bands: the y that sits on the guide.
pub ref_y: f64,
}
#[derive(Clone, Copy, Debug)]
enum LineMap {
Fill {
band: usize,
cx: f64,
k: f64,
len: f64,
y0: f64,
y1: f64,
},
/// `guide`: the line's own parallel guide in [`Mapper::offsets`], if it is off the band's.
Follow {
band: usize,
guide: Option<usize>,
e0: f64,
s0: f64,
k: f64,
ref_y: f64,
},
}
/// Maps points of laid-out lines onto a warp.
#[derive(Clone, Debug)]
pub struct Mapper<'a> {
warp: &'a Warp,
lines: Vec<LineMap>,
offsets: Vec<Guide>,
zoom: f64,
}
impl Warp {
/// Plan the mapping of `lines`, laid out in the inner text box `inner` (the line's place in
/// it gives its alignment along follow guides; the insets themselves don't shorten a guide).
pub fn mapper(&self, lines: &[WarpLine], inner: Rect) -> Mapper<'_> {
let nb = self.bands.len().max(1);
let n = lines.len();
let band_of: Vec<usize> = (0..n).map(|i| band_of_line(i, n, nb).min(nb - 1)).collect();
// Ink of the whole text, for the shared horizontal centre and scale of fill bands.
let ink_all = lines.iter().filter_map(|l| l.ink).reduce(|a, b| a.union(b));
let cx = ink_all.map(|r| r.center().x).unwrap_or(0.0);
let mut k_fill = f64::INFINITY;
let mut zoom: f64 = 1.0;
let mut band_y: Vec<Option<(f64, f64)>> = vec![None; nb];
for (i, l) in lines.iter().enumerate() {
let Some(r) = l.ink else { continue };
let b = band_of.get(i).copied().unwrap_or(0);
if let Some(slot) = band_y.get_mut(b) {
*slot = Some(match *slot {
Some((y0, y1)) => (y0.min(r.y0), y1.max(r.y1)),
None => (r.y0, r.y1),
});
}
}
// Every fill band maps a box as tall as the tallest band's ink, centred on its own ink, so
// a band with fewer lines keeps them at the same size, centred between its guides.
let tallest = band_y.iter().flatten().map(|(y0, y1)| y1 - y0).fold(0.0, f64::max);
let band_y: Vec<Option<(f64, f64)>> =
band_y.iter().map(|r| r.map(|(y0, y1)| ((y0 + y1 - tallest) / 2.0, (y0 + y1 + tallest) / 2.0))).collect();
for (b, band) in self.bands.iter().enumerate() {
if let Band::Fill { top, bottom } = band {
let half = lines
.iter()
.enumerate()
.filter(|(i, _)| band_of.get(*i) == Some(&b))
.filter_map(|(_, l)| l.ink)
.map(|r| (r.x0 - cx).abs().max((r.x1 - cx).abs()))
.fold(0.0, f64::max);
if half > 1e-9 {
k_fill = k_fill.min(band.length() / (2.0 * half));
}
if let Some(Some((y0, y1))) = band_y.get(b) {
let thick = [0.0, 0.25, 0.5, 0.75, 1.0].iter().map(|&u| (top.at_frac(u) - bottom.at_frac(u)).hypot()).fold(0.0, f64::max);
if y1 - y0 > 1e-9 {
zoom = zoom.max(thick / (y1 - y0));
}
}
}
}
if !k_fill.is_finite() {
k_fill = 1.0;
}
zoom = zoom.max(k_fill);
let mut maps = Vec::with_capacity(n);
let mut offsets = Vec::new();
for (i, l) in lines.iter().enumerate() {
let b = band_of.get(i).copied().unwrap_or(0);
let in_band = |j: &usize| band_of.get(*j) == Some(&b);
match self.bands.get(b) {
Some(Band::Fill { .. }) | None => {
let (y0, y1) = band_y.get(b).copied().flatten().unwrap_or((0.0, 1.0));
let len = self.bands.get(b).map(Band::length).unwrap_or(0.0);
maps.push(LineMap::Fill { band: b, cx, k: k_fill, len, y0, y1 });
}
Some(Band::Follow { path, anchor }) => {
let len = path.length();
let widest = (0..n).filter(in_band).filter_map(|j| lines.get(j)).map(|l| l.extent.1 - l.extent.0).fold(0.0, f64::max);
let k = if widest > len && widest > 1e-9 { len / widest } else { 1.0 };
let members: Vec<&WarpLine> = (0..n).filter(in_band).filter_map(|j| lines.get(j)).collect();
let ref_y = match anchor {
LineAnchor::Last => members.last().map(|l| l.ref_y),
LineAnchor::First => members.first().map(|l| l.ref_y),
LineAnchor::Middle => match (members.first(), members.last()) {
(Some(a), Some(z)) => Some((a.ref_y + z.ref_y) / 2.0),
_ => None,
},
}
.unwrap_or(l.ref_y);
// Lines off the guide run on a parallel curve at their natural length.
let d = (ref_y - l.ref_y) * k;
let (guide, len) = if d.abs() > 1e-6 && d.is_finite() && offsets.len() < 4096 {
let g = path.offset(d);
let len = g.length();
offsets.push(g);
(Some(offsets.len() - 1), len)
} else {
(None, len)
};
let (e0, e1) = l.extent;
let w = (e1 - e0).max(0.0) * k;
let (gl, gr) = ((e0 - inner.x0).max(0.0), (inner.x1 - e1).max(0.0));
let f = if gl + gr > 1e-9 { gl / (gl + gr) } else { 0.5 };
let s0 = f * (len - w);
maps.push(LineMap::Follow { band: b, guide, e0, s0, k, ref_y: l.ref_y });
}
}
}
Mapper { warp: self, lines: maps, offsets, zoom: if zoom.is_finite() { zoom.clamp(1.0, 1.0e4) } else { 1.0 } }
}
}
impl Mapper<'_> {
/// How much the warp magnifies text at most (for flattening tolerances), ≥ 1.
pub fn zoom(&self) -> f64 {
self.zoom
}
/// Map point `p` of line `line` (layout coordinates) onto the warp.
pub fn map(&self, line: usize, p: Point) -> Point {
let out = match self.lines.get(line) {
Some(&LineMap::Fill { band, cx, k, len, y0, y1 }) => {
let Some(Band::Fill { top, bottom }) = self.warp.bands.get(band) else { return p };
let u = if len > 1e-9 { 0.5 + (p.x - cx) * k / len } else { 0.5 };
let v = if y1 - y0 > 1e-9 { (p.y - y0) / (y1 - y0) } else { 0.5 };
let (t, b) = (top.at_frac(u), bottom.at_frac(u));
t.lerp(b, v)
}
Some(&LineMap::Follow { band, guide, e0, s0, k, ref_y }) => {
let path = match (guide.and_then(|g| self.offsets.get(g)), self.warp.bands.get(band)) {
(Some(g), _) => g,
(None, Some(Band::Follow { path, .. })) => path,
_ => return p,
};
let s = s0 + (p.x - e0) * k;
let d = (ref_y - p.y) * k;
let (q, t) = path.at(s);
q + Vec2::new(t.y, -t.x) * d
}
None => p,
};
if out.x.is_finite() && out.y.is_finite() { out } else { p }
}
}
#[cfg(test)]
mod tests;

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@ -0,0 +1,309 @@
use super::*;
const ALL: &[&str] = &[
"textPlain",
"textStop",
"textTriangle",
"textTriangleInverted",
"textChevron",
"textChevronInverted",
"textRingInside",
"textRingOutside",
"textArchUp",
"textArchDown",
"textCircle",
"textButton",
"textArchUpPour",
"textArchDownPour",
"textCirclePour",
"textButtonPour",
"textCurveUp",
"textCurveDown",
"textCanUp",
"textCanDown",
"textWave1",
"textWave2",
"textDoubleWave1",
"textWave4",
"textInflate",
"textDeflate",
"textInflateBottom",
"textDeflateBottom",
"textInflateTop",
"textDeflateTop",
"textDeflateInflate",
"textDeflateInflateDeflate",
"textFadeRight",
"textFadeLeft",
"textFadeUp",
"textFadeDown",
"textSlantUp",
"textSlantDown",
"textCascadeUp",
"textCascadeDown",
];
const W: f64 = 420.0;
const H: f64 = 200.0;
fn rect() -> Rect {
Rect::new(0.0, 0.0, W, H)
}
/// One line whose ink box is `ink`.
fn one_line(ink: Rect) -> Vec<WarpLine> {
vec![WarpLine { ink: Some(ink), extent: (ink.x0, ink.x1), ref_y: ink.y1 }]
}
/// Where the unit-square point (u, v) of a single line's ink box lands, in unit coordinates.
fn land(name: &str, adj: &[f64], u: f64, v: f64) -> (f64, f64) {
let w = warp(name, adj, rect()).unwrap();
let ink = Rect::new(100.0, 50.0, 300.0, 90.0);
let lines = one_line(ink);
let m = w.mapper(&lines, rect().inset(-5.0));
let p = m.map(0, Point::new(ink.x0 + u * ink.width(), ink.y0 + v * ink.height()));
(p.x / W, p.y / H)
}
fn close(a: (f64, f64), b: (f64, f64), tol: f64) -> bool {
(a.0 - b.0).abs() <= tol && (a.1 - b.1).abs() <= tol
}
#[track_caller]
fn corners(name: &str, adj: &[f64], tl: (f64, f64), tr: (f64, f64), bl: (f64, f64), br: (f64, f64)) {
for ((u, v), want) in [((0.0, 0.0), tl), ((1.0, 0.0), tr), ((0.0, 1.0), bl), ((1.0, 1.0), br)] {
let got = land(name, adj, u, v);
assert!(close(got, want, 0.004), "{name} corner ({u},{v}): got {got:?}, want {want:?}");
}
}
#[test]
fn every_preset_builds_finite_guides() {
for name in ALL {
assert!(is_supported(name), "{name}");
let w = warp(name, &[], rect()).unwrap_or_else(|| panic!("{name}"));
assert!(!w.bands.is_empty(), "{name}");
for b in &w.bands {
let l = b.length();
assert!(l.is_finite() && l > 10.0, "{name}: band length {l}");
}
assert_eq!(adjust_count(name), adjust_defaults(name).len());
}
assert!(warp("textNoShape", &[], rect()).is_none());
assert!(warp("bogus", &[], rect()).is_none());
assert!(!is_supported("textNoShape"));
}
#[test]
fn straight_presets_put_the_ink_corners_on_their_guides() {
corners("textPlain", &[], (0.0, 0.0), (1.0, 0.0), (0.0, 1.0), (1.0, 1.0));
// A smaller adjust shears the text: the top edge starts 40 % in, the bottom edge ends 60 % in.
corners("textPlain", &[30_000.0], (0.4, 0.0), (1.0, 0.0), (0.0, 1.0), (0.6, 1.0));
corners("textStop", &[], (0.0, 0.25), (1.0, 0.25), (0.0, 0.75), (1.0, 0.75));
corners("textTriangle", &[], (0.0, 0.5), (1.0, 0.5), (0.0, 1.0), (1.0, 1.0));
corners("textTriangleInverted", &[25_000.0], (0.0, 0.0), (1.0, 0.0), (0.0, 0.25), (1.0, 0.25));
corners("textChevron", &[], (0.0, 0.25), (1.0, 0.25), (0.0, 1.0), (1.0, 1.0));
corners("textChevronInverted", &[], (0.0, 0.0), (1.0, 0.0), (0.0, 0.75), (1.0, 0.75));
corners("textFadeRight", &[], (0.0, 0.0), (1.0, 0.33333), (0.0, 1.0), (1.0, 0.66667));
corners("textFadeLeft", &[], (0.0, 0.33333), (1.0, 0.0), (0.0, 0.66667), (1.0, 1.0));
corners("textFadeUp", &[], (0.33333, 0.0), (0.66667, 0.0), (0.0, 1.0), (1.0, 1.0));
corners("textFadeDown", &[], (0.0, 0.0), (1.0, 0.0), (0.33333, 1.0), (0.66667, 1.0));
corners("textSlantUp", &[], (0.0, 0.55556), (1.0, 0.0), (0.0, 1.0), (1.0, 0.44444));
corners("textSlantDown", &[], (0.0, 0.0), (1.0, 0.55556), (0.0, 0.44444), (1.0, 1.0));
corners("textCascadeUp", &[], (0.0, 0.13889), (1.0, 0.0), (0.0, 1.0), (1.0, 0.44444));
corners("textCascadeDown", &[], (0.0, 0.0), (1.0, 0.13889), (0.0, 0.44444), (1.0, 1.0));
}
#[test]
fn curved_presets_bend_where_powerpoint_bends_them() {
corners("textInflate", &[], (0.0, 0.1875), (1.0, 0.1875), (0.0, 0.8125), (1.0, 0.8125));
assert!(close(land("textInflate", &[], 0.5, 0.0), (0.5, 0.0), 0.004));
assert!(close(land("textInflate", &[], 0.5, 1.0), (0.5, 1.0), 0.004));
corners("textDeflate", &[], (0.0, 0.0), (1.0, 0.0), (0.0, 1.0), (1.0, 1.0));
assert!(close(land("textDeflate", &[], 0.5, 0.0), (0.5, 0.1875), 0.004));
corners("textInflateBottom", &[], (0.0, 0.0), (1.0, 0.0), (0.0, 0.6), (1.0, 0.6));
assert!(close(land("textInflateBottom", &[], 0.5, 1.0), (0.5, 0.8), 0.004));
assert!(close(land("textDeflateBottom", &[], 0.5, 1.0), (0.5, 0.5), 0.004));
assert!(close(land("textInflateTop", &[], 0.5, 0.0), (0.5, 0.2), 0.004));
assert!(close(land("textDeflateTop", &[], 0.5, 0.0), (0.5, 0.5), 0.004));
// Cans: half ellipses.
corners("textCanUp", &[], (0.0, 0.15), (1.0, 0.15), (0.0, 1.0), (1.0, 1.0));
assert!(close(land("textCanUp", &[], 0.5, 0.0), (0.5, 0.0), 0.004));
assert!(close(land("textCanUp", &[], 0.5, 1.0), (0.5, 0.85), 0.004));
assert!(close(land("textCanDown", &[], 0.5, 0.0), (0.5, 0.14286), 0.004));
// Curves and waves.
let a = 0.45977;
corners("textCurveUp", &[], (0.0, a), (1.0, 0.0), (0.0, 1.0 - 3.0 * a / 8.0), (1.0, 1.0 - 3.0 * a / 8.0));
assert!(close(land("textCurveUp", &[], 0.5, 1.0), (0.5, 1.0), 0.004));
corners("textCurveDown", &[], (0.0, 0.0), (1.0, a), (0.0, 1.0 - 3.0 * a / 8.0), (1.0, 1.0 - 3.0 * a / 8.0));
corners("textWave1", &[], (0.0, 0.125), (1.0, 0.125), (0.0, 0.875), (1.0, 0.875));
// Wave 1 rises first: its top is near the box top a quarter of the way along.
assert!(land("textWave1", &[], 0.25, 0.0).1 < 0.02);
assert!(land("textWave2", &[], 0.25, 0.0).1 > 0.23);
// A horizontal shift moves the bottom guide right.
corners("textWave1", &[12_500.0, 5_000.0], (0.0, 0.125), (0.9, 0.125), (0.1, 0.875), (1.0, 0.875));
assert!(land("textDoubleWave1", &[], 0.125, 0.0).1 < 0.02);
assert!(land("textWave4", &[], 0.125, 0.0).1 > 0.1);
}
#[test]
fn arc_presets_follow_ellipses() {
// Pour arches: the outer arc from the left end over the top; the inner one is scaled by adj2.
corners("textArchUpPour", &[], (0.0, 0.5), (1.0, 0.5), (0.25, 0.5), (0.75, 0.5));
assert!(close(land("textArchUpPour", &[], 0.5, 0.0), (0.5, 0.0), 0.004));
assert!(close(land("textArchUpPour", &[], 0.5, 1.0), (0.5, 0.25), 0.004));
assert!(close(land("textArchUpPour", &[10_800_000.0, 30_000.0], 0.5, 1.0), (0.5, 0.35), 0.004));
assert!(close(land("textArchDownPour", &[], 0.5, 0.0), (0.5, 0.625), 0.004));
assert!(close(land("textArchDownPour", &[], 0.5, 1.0), (0.5, 1.0), 0.004));
// Circle pour: once round from the left; the middle of the text is at the right.
assert!(close(land("textCirclePour", &[], 0.5, 0.0), (1.0, 0.5), 0.004));
// Rings: the text goes round two stacked ellipses.
assert!(close(land("textRingInside", &[], 0.0, 0.0), (0.0, 0.3), 0.004));
assert!(close(land("textRingInside", &[], 0.0, 1.0), (0.0, 0.7), 0.004));
assert!(close(land("textRingInside", &[], 0.25, 0.0), (0.5, 0.0), 0.01));
assert!(close(land("textRingOutside", &[], 0.25, 1.0), (0.5, 1.0), 0.01));
}
#[test]
fn follow_presets_keep_text_size_and_stack_lines_outwards() {
let w = warp("textArchUp", &[], rect()).unwrap();
// A 40-wide centred line whose reference height is 80.
let line = WarpLine { ink: Some(Rect::new(190.0, 50.0, 230.0, 88.0)), extent: (190.0, 230.0), ref_y: 80.0 };
let inner = Rect::new(7.2, 3.6, W - 7.2, H - 3.6);
let m = w.mapper(&[line], inner);
// The middle of the reference line lands on the top of the ellipse; 10 pt above it lands
// 10 pt above the top.
let p = m.map(0, Point::new(210.0, 80.0));
assert!((p.x - 210.0).abs() < 0.05 && p.y.abs() < 0.05, "{p:?}");
let q = m.map(0, Point::new(210.0, 70.0));
assert!((q.x - 210.0).abs() < 0.15 && (q.y + 10.0).abs() < 0.05, "{q:?}");
// Natural size: 40 pt of text spans about 40 pt of arc.
let (a, b) = (m.map(0, Point::new(190.0, 80.0)), m.map(0, Point::new(230.0, 80.0)));
assert!(((b - a).hypot() - 40.0).abs() < 0.5);
// Left-aligned text starts at the very start of the arc: insets don't shorten it.
let left = WarpLine { ink: Some(Rect::new(7.2, 50.0, 47.2, 88.0)), extent: (7.2, 47.2), ref_y: 80.0 };
let m = w.mapper(&[left], inner);
let p = m.map(0, Point::new(7.2, 80.0));
assert!(p.x.abs() < 0.01 && (p.y - 100.0).abs() < 0.01, "{p:?}");
// Two lines on an arch up: the last sits on the arc, the first stacks outside it.
let l1 = WarpLine { ink: Some(Rect::new(190.0, 10.0, 230.0, 40.0)), extent: (190.0, 230.0), ref_y: 34.0 };
let l2 = WarpLine { ink: Some(Rect::new(190.0, 50.0, 230.0, 80.0)), extent: (190.0, 230.0), ref_y: 74.0 };
let m = w.mapper(&[l1, l2], inner);
assert!(m.map(1, Point::new(210.0, 74.0)).y.abs() < 0.05);
assert!((m.map(0, Point::new(210.0, 34.0)).y + 40.0).abs() < 0.05);
// Arch down: the first line sits on the bottom of the ellipse.
let w = warp("textArchDown", &[], rect()).unwrap();
let m = w.mapper(&[l1, l2], inner);
assert!((m.map(0, Point::new(210.0, 34.0)).y - H).abs() < 0.05);
assert!((m.map(1, Point::new(210.0, 74.0)).y - H - 40.0).abs() < 0.05);
// Text longer than the arc is shrunk to fit it.
let w = warp("textArchUp", &[], rect()).unwrap();
let long = WarpLine { ink: Some(Rect::new(-500.0, 50.0, 900.0, 88.0)), extent: (-500.0, 900.0), ref_y: 80.0 };
let m = w.mapper(&[long], inner);
let (a, b) = (m.map(0, Point::new(-500.0, 80.0)), m.map(0, Point::new(900.0, 80.0)));
assert!(a.x < 5.0 && b.x > W - 5.0 && (a.y - 100.0).abs() < 10.0 && (b.y - 100.0).abs() < 10.0, "{a:?} {b:?}");
}
#[test]
fn lines_share_bands_in_order() {
assert_eq!((0..2).map(|i| band_of_line(i, 2, 2)).collect::<Vec<_>>(), [0, 1]);
assert_eq!((0..3).map(|i| band_of_line(i, 3, 2)).collect::<Vec<_>>(), [0, 0, 1]);
assert_eq!((0..5).map(|i| band_of_line(i, 5, 2)).collect::<Vec<_>>(), [0, 0, 0, 1, 1]);
assert_eq!((0..5).map(|i| band_of_line(i, 5, 3)).collect::<Vec<_>>(), [0, 0, 1, 1, 2]);
assert_eq!((0..4).map(|i| band_of_line(i, 4, 3)).collect::<Vec<_>>(), [0, 0, 1, 2]);
assert_eq!((0..2).map(|i| band_of_line(i, 2, 3)).collect::<Vec<_>>(), [0, 1]);
assert_eq!(band_of_line(0, 1, 3), 0);
assert_eq!(band_of_line(7, 9, 1), 0);
assert_eq!(band_of_line(0, 0, 3), 0);
}
#[test]
fn deflate_inflate_maps_each_band_separately() {
let w = warp("textDeflateInflate", &[], rect()).unwrap();
assert_eq!(w.bands.len(), 2);
let l1 = WarpLine { ink: Some(Rect::new(100.0, 10.0, 300.0, 40.0)), extent: (100.0, 300.0), ref_y: 34.0 };
let l2 = WarpLine { ink: Some(Rect::new(100.0, 50.0, 300.0, 80.0)), extent: (100.0, 300.0), ref_y: 74.0 };
let m = w.mapper(&[l1, l2], rect());
// Band 1 ends at 45 % height on the sides, band 2 starts at 55 %.
assert!((m.map(0, Point::new(100.0, 40.0)).y / H - 0.45).abs() < 0.004);
assert!((m.map(1, Point::new(100.0, 50.0)).y / H - 0.55).abs() < 0.004);
assert!((m.map(1, Point::new(300.0, 80.0)).y / H - 1.0).abs() < 0.004);
// A band with fewer lines keeps them at the size of the fuller band, centred in its band:
// two lines (ink 10..60) in band 1, one line (ink 70..80) in band 2 of three.
let a = WarpLine { ink: Some(Rect::new(100.0, 10.0, 300.0, 30.0)), extent: (100.0, 300.0), ref_y: 28.0 };
let b = WarpLine { ink: Some(Rect::new(100.0, 40.0, 300.0, 60.0)), extent: (100.0, 300.0), ref_y: 58.0 };
let c = WarpLine { ink: Some(Rect::new(100.0, 70.0, 300.0, 80.0)), extent: (100.0, 300.0), ref_y: 78.0 };
let m = w.mapper(&[a, b, c], rect());
let (top, bot) = (m.map(2, Point::new(200.0, 70.0)).y / H, m.map(2, Point::new(200.0, 80.0)).y / H);
// Band 2 runs from 0.4 to 1 at the centre; the line takes the middle fifth of it.
assert!((top - 0.64).abs() < 0.005 && (bot - 0.76).abs() < 0.005, "{top} {bot}");
// A shorter first line keeps its share of the width.
let short = WarpLine { ink: Some(Rect::new(150.0, 10.0, 250.0, 40.0)), extent: (150.0, 250.0), ref_y: 34.0 };
let m = w.mapper(&[short, l2], rect());
let p = m.map(0, Point::new(150.0, 10.0));
assert!((p.x / W - 0.25).abs() < 0.01, "{p:?}");
}
#[test]
fn guides_extrapolate_and_wrap() {
let mut p = BezPath::new();
p.move_to((0.0, 0.0));
p.line_to((10.0, 0.0));
let g = Guide::from_path(&p, false);
assert!((g.length() - 10.0).abs() < 1e-9);
assert!((g.at(15.0).0.x - 15.0).abs() < 1e-9);
assert!((g.at(-5.0).0.x + 5.0).abs() < 1e-9);
assert!(g.at(f64::NAN).0.x.is_finite());
let w = warp("textCircle", &[], rect()).unwrap();
let Some(Band::Follow { path, .. }) = w.bands.first() else { panic!() };
assert!(path.is_closed());
let l = path.length();
let (a, b) = (path.at(5.0).0, path.at(l + 5.0).0);
assert!((a - b).hypot() < 1e-6);
let empty = Guide::default();
assert_eq!(empty.length(), 0.0);
assert!(empty.at(3.0).0.x.is_finite());
}
#[test]
fn hostile_adjusts_and_boxes_stay_finite() {
let adjs: &[&[f64]] =
&[&[], &[f64::NAN, f64::INFINITY], &[f64::NEG_INFINITY, f64::NAN], &[1e300, -1e300], &[-1e9, 1e9], &[0.0, 0.0], &[21_599_999.0, 100_000.0]];
let rects = [
Rect::new(0.0, 0.0, 0.0, 0.0),
Rect::new(10.0, 10.0, 10.0, 200.0),
Rect::new(0.0, 0.0, 300.0, 0.0),
Rect::new(100.0, 100.0, -50.0, -20.0),
Rect::new(0.0, 0.0, 1e7, 1e7),
];
let lines = [
WarpLine { ink: Some(Rect::new(0.0, 0.0, 0.0, 0.0)), extent: (0.0, 0.0), ref_y: 0.0 },
WarpLine { ink: None, extent: (5.0, 5.0), ref_y: 3.0 },
WarpLine { ink: Some(Rect::new(-1e6, -5.0, 1e6, 5.0)), extent: (-1e6, 1e6), ref_y: 4.0 },
];
for name in ALL {
for adj in adjs {
for r in rects {
let Some(w) = warp(name, adj, r) else { panic!("{name} {adj:?} {r:?}") };
for b in &w.bands {
assert!(b.length().is_finite());
}
let m = w.mapper(&lines, r);
assert!(m.zoom().is_finite() && m.zoom() >= 1.0);
let probes = [
(0, Point::ZERO),
(1, Point::new(5.0, 3.0)),
(2, Point::new(1e6, -5.0)),
(2, Point::new(f64::NAN, 1.0)),
(9, Point::new(1.0, 1.0)),
];
for (i, p) in probes {
let q = m.map(i, p);
assert!(q.x.is_finite() || !p.x.is_finite(), "{name} {adj:?} {r:?}: {q:?}");
assert!(q.y.is_finite(), "{name} {adj:?} {r:?}: {q:?}");
}
}
}
}
assert!(warp("textPlain", &[], Rect::new(f64::NAN, 0.0, 1.0, 1.0)).is_none());
}

View File

@ -223,6 +223,7 @@ pub fn body(ctx: &Ctx, shape: &Shape) -> BodyProps {
columns: Some(1),
col_spacing: Some(0.0),
warp: None,
warp_adj: Vec::new(),
rtl_col: Some(false),
upright: Some(false),
});

View File

@ -98,6 +98,10 @@ pub struct BodyProps {
pub col_spacing: Option<f64>,
/// WordArt transform (`prstTxWarp`), e.g. `textArchUp`.
pub warp: Option<String>,
/// The warp's adjust values (`prstTxWarp/avLst`: `adj` or `adj1`, `adj2`…, raw guide values);
/// empty = the preset's defaults.
#[serde(skip_serializing_if = "Vec::is_empty")]
pub warp_adj: Vec<f64>,
pub rtl_col: Option<bool>,
/// Keep text upright when the shape rotates.
pub upright: Option<bool>,
@ -119,6 +123,7 @@ impl BodyProps {
self.col_spacing = self.col_spacing.or(p.col_spacing);
if self.warp.is_none() {
self.warp.clone_from(&p.warp);
self.warp_adj.clone_from(&p.warp_adj);
}
self.rtl_col = self.rtl_col.or(p.rtl_col);
self.upright = self.upright.or(p.upright);

View File

@ -321,13 +321,45 @@ pub fn body_pr(b: &El) -> BodyProps {
}
"spAutoFit" => p.autofit = Some(AutoFit::Shape),
"noAutofit" => p.autofit = Some(AutoFit::None),
"prstTxWarp" => p.warp = e.attr("prst").filter(|w| *w != "textNoShape").map(String::from),
"prstTxWarp" => {
p.warp = e.attr("prst").filter(|w| *w != "textNoShape" && !w.is_empty()).map(String::from);
p.warp_adj = p.warp.as_deref().map(|w| warp_adjusts(w, e)).unwrap_or_default();
}
_ => {}
}
}
p
}
/// `prstTxWarp/avLst` guides `adj` / `adj1`… as raw values by index (empty when none is given);
/// slots the file leaves out keep the preset's default.
fn warp_adjusts(preset: &str, e: &El) -> Vec<f64> {
let mut adj: Vec<f64> = Vec::new();
let Some(av) = e.child("avLst") else { return adj };
let defaults = deckcraft_geom::warp::adjust_defaults(preset);
for gd in av.children_named("gd").take(16) {
let n = gd.attr("name").unwrap_or("");
let idx = if n == "adj" {
0
} else if let Some(k) = n.strip_prefix("adj").and_then(|k| k.parse::<usize>().ok()).filter(|k| (1..=8).contains(k)) {
k - 1
} else {
continue;
};
let Some(v) = gd.attr("fmla").and_then(|f| f.trim().strip_prefix("val")).and_then(|v| v.trim().parse::<f64>().ok()).filter(|v| v.is_finite())
else {
continue;
};
while adj.len() <= idx {
adj.push(defaults.get(adj.len()).copied().unwrap_or(0.0));
}
if let Some(slot) = adj.get_mut(idx) {
*slot = v.clamp(-1.0e9, 1.0e9);
}
}
adj
}
fn spacing(e: &El) -> Option<Spacing> {
if let Some(p) = e.child("spcPct") {
return Some(Spacing::Pct(pct(p, "val").unwrap_or(1.0).clamp(0.0, 100.0)));

View File

@ -392,7 +392,19 @@ pub fn body_pr(w: &mut W, b: &BodyProps) {
w.open("a:bodyPr", a);
if let Some(p) = warp {
w.open("a:prstTxWarp", A::new().a("prst", p));
w.empty0("a:avLst");
let adj: Vec<(usize, i64)> =
b.warp_adj.iter().take(8).enumerate().filter(|(_, v)| v.is_finite()).map(|(i, v)| (i, v.round().clamp(-2.0e9, 2.0e9) as i64)).collect();
if adj.is_empty() {
w.empty0("a:avLst");
} else {
let single = deckcraft_geom::warp::adjust_count(p) <= 1 && b.warp_adj.len() == 1;
w.open0("a:avLst");
for (i, v) in adj {
let n = if single { "adj".to_string() } else { format!("adj{}", i + 1) };
w.empty("a:gd", A::new().a("name", n).a("fmla", format!("val {v}")));
}
w.close("a:avLst");
}
w.close("a:prstTxWarp");
}
match b.autofit {

View File

@ -796,3 +796,64 @@ fn a_table_fill_round_trips() {
matches!(&t.background, Some(Fill::Solid { color }) if matches!(color.base, deckcraft_model::ColorBase::Rgb { rgb } if rgb == Rgba::rgb(0, 112, 192)))
);
}
#[test]
fn wordart_warps_and_their_adjusts_round_trip() {
let mut p = Presentation::default();
let cases: [(&str, &str, Vec<f64>); 5] = [
("Arch pour", "textArchUpPour", vec![13_500_000.0, 30_000.0]),
("Wave", "textWave1", vec![18_000.0, -5_000.0]),
("Inflate", "textInflate", vec![30_000.0]),
("Arch", "textArchUp", vec![]),
("Ring", "textRingInside", vec![75_000.0]),
];
let mut shapes = vec![];
for (i, (name, warp, adj)) in cases.iter().enumerate() {
let mut s = shape(&mut p, name, 10.0, 10.0 + 50.0 * i as f64, 300.0, 40.0);
let mut body = TextBody::from_text("WordArt");
body.body.warp = Some((*warp).into());
body.body.warp_adj = adj.clone();
s.text = Some(body);
shapes.push(s);
}
Arc::make_mut(&mut p.slides[0]).shapes = shapes;
let q = round(&p);
for (name, warp, adj) in &cases {
let b = &by_name(&q.slides[0], name).text.as_ref().expect("text").body;
assert_eq!(b.warp.as_deref(), Some(*warp), "{name}");
assert_eq!(&b.warp_adj, adj, "{name}");
}
// The single-adjust preset is written with the guide name `adj`, two-adjust ones with
// `adj1`/`adj2`, and a preset with no adjusts given gets an empty list.
let bytes = deckcraft_pptx::export(&p).expect("export");
let mut zip = zip::ZipArchive::new(std::io::Cursor::new(bytes)).expect("zip");
let mut xml = String::new();
std::io::Read::read_to_string(&mut zip.by_name("ppt/slides/slide1.xml").expect("slide"), &mut xml).expect("read");
assert!(xml.contains(r#"<a:prstTxWarp prst="textInflate"><a:avLst><a:gd name="adj" fmla="val 30000"/></a:avLst></a:prstTxWarp>"#), "{xml}");
assert!(xml.contains(r#"<a:gd name="adj1" fmla="val 13500000"/><a:gd name="adj2" fmla="val 30000"/>"#));
assert!(xml.contains(r#"<a:prstTxWarp prst="textArchUp"><a:avLst/></a:prstTxWarp>"#));
// A file that gives only `adj2` keeps the preset's default for `adj1`; hostile values are
// read as numbers or dropped.
let edited = xml
.replace(r#"<a:gd name="adj1" fmla="val 13500000"/>"#, "")
.replace(r#"<a:gd name="adj" fmla="val 30000"/>"#, r#"<a:gd name="adj" fmla="val NaN"/>"#);
let mut out = zip::ZipWriter::new(std::io::Cursor::new(Vec::new()));
for i in 0..zip.len() {
let mut f = zip.by_index(i).expect("entry");
let name = f.name().to_string();
let mut data = vec![];
std::io::Read::read_to_end(&mut f, &mut data).expect("read");
if name == "ppt/slides/slide1.xml" {
data = edited.clone().into_bytes();
}
out.start_file(name, zip::write::SimpleFileOptions::default()).expect("start");
std::io::Write::write_all(&mut out, &data).expect("write");
}
let bytes = out.finish().expect("finish").into_inner();
let q = deckcraft_pptx::import(&bytes).expect("import");
let pour = &by_name(&q.slides[0], "Arch pour").text.as_ref().expect("text").body;
assert_eq!(pour.warp_adj, vec![10_800_000.0, 30_000.0]);
let inflate = &by_name(&q.slides[0], "Inflate").text.as_ref().expect("text").body;
assert_eq!(inflate.warp.as_deref(), Some("textInflate"));
assert!(inflate.warp_adj.is_empty());
}

View File

@ -21,6 +21,7 @@ mod pathgrad;
mod placed;
mod ramp;
mod table;
mod warp;
use std::collections::HashMap;
use std::sync::Arc;
@ -816,7 +817,10 @@ impl Renderer {
let tr = geo.text_rect;
if !body.is_empty() {
let l = deckcraft_text::layout(rctx, s, body, &Opts { rect: tr, fields: &f.fields, prompt_color: None, no_shrink: false });
draw_layout_with(ctx, &l, tr, m, &st.paras);
match text_warp(rctx, s, tr).filter(|_| l.rotation == 0.0) {
Some(w) => warp::draw(ctx, &l, tr, m, &st.paras, &w),
None => draw_layout_with(ctx, &l, tr, m, &st.paras),
}
} else if f.opts.edit && s.ph.is_some() {
let kind = s.ph_type().unwrap_or(PhType::Body);
let prompt_body = prompt_body(rctx, s, kind);
@ -1146,6 +1150,13 @@ pub fn text_transform(m: Affine, tr: Rect, rotation: f64) -> Affine {
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, &[]);

View File

@ -994,3 +994,84 @@ fn shadows_and_glows_spread_like_powerpoints() {
assert!((60..170).contains(&red(&img, 15, 120)), "{}", red(&img, 15, 120));
assert!(red(&img, 10, 120) > 245);
}
/// A 400 × 200 text box at (100, 100) holding `text` at 40 pt, warped by `warp`.
fn wordart(warp: Option<&str>, text: &str) -> Presentation {
let mut t = TextBody::from_text(text);
t.paragraphs[0].runs[0].props.size = Some(40.0);
t.paragraphs[0].props.align = Some(deckcraft_model::text::Align::Center);
t.body.warp = warp.map(String::from);
deck_with(vec![Shape { id: ShapeId(700), xfrm: Some(Xfrm::new(100.0, 100.0, 400.0, 200.0)), text: Some(t), ..Default::default() }])
}
/// Ink box (x0, y0, x1, y1) of dark pixels, and the top ink row of each column.
fn ink(img: &Image) -> ((u32, u32, u32, u32), Vec<Option<u32>>) {
let mut b = (u32::MAX, u32::MAX, 0, 0);
let mut tops = vec![None; img.width as usize];
for y in 0..img.height {
for x in 0..img.width {
if img.pixel(x, y)[0] < 128 {
b = (b.0.min(x), b.1.min(y), b.2.max(x), b.3.max(y));
if tops[x as usize].is_none() {
tops[x as usize] = Some(y);
}
}
}
}
(b, tops)
}
#[test]
fn wordart_arch_up_lifts_the_middle_of_the_line() {
let o = RenderOpts { scale: 1.0, ..Default::default() };
let flat = render_slide(&wordart(None, "ARCHED WORDART"), 0, &o);
let arched = render_slide(&wordart(Some("textArchUp"), "ARCHED WORDART"), 0, &o);
assert!(diff_px(&flat, &arched) > 1000);
let ((fx0, _, fx1, _), ftops) = ink(&flat);
let ((ax0, ay0, ax1, _), atops) = ink(&arched);
let top_near = |tops: &[Option<u32>], x: u32| (x.saturating_sub(15)..x + 15).filter_map(|i| tops.get(i as usize).copied().flatten()).min();
// Flat text: the ends and the middle stand on one line.
let (fl, fm) = (top_near(&ftops, fx0 + 20).unwrap(), top_near(&ftops, (fx0 + fx1) / 2).unwrap());
assert!(fl.abs_diff(fm) < 4, "flat {fl} {fm}");
// Arched: the line follows the top of the ellipse inscribed in the box, so the middle is
// at the box top and the ends sit clearly lower.
let (al, am, ar) = (top_near(&atops, ax0 + 20).unwrap(), top_near(&atops, (ax0 + ax1) / 2).unwrap(), top_near(&atops, ax1 - 20).unwrap());
assert!(al > am + 10 && ar > am + 10, "arched {al} {am} {ar}");
assert!((80..=110).contains(&ay0), "arch top {ay0}");
}
#[test]
fn wordart_plain_stretches_the_ink_over_the_text_rect() {
let img = render_slide(&wordart(Some("textPlain"), "PLAIN"), 0, &RenderOpts { scale: 1.0, ..Default::default() });
let ((x0, y0, x1, y1), _) = ink(&img);
for (got, want) in [(x0, 100), (y0, 100), (x1, 499), (y1, 299)] {
assert!(got.abs_diff(want) <= 2, "ink box {:?}", (x0, y0, x1, y1));
}
}
#[test]
fn unknown_or_absent_warps_draw_flat_text() {
let o = RenderOpts { scale: 0.5, ..Default::default() };
// Warm the font database first (other tests load fonts concurrently).
let _ = render_slide(&wordart(None, "FLAT"), 0, &o);
let flat = render_slide(&wordart(None, "FLAT"), 0, &o);
for w in ["textNoShape", "bogus", ""] {
assert_eq!(diff_px(&flat, &render_slide(&wordart(Some(w), "FLAT"), 0, &o)), 0, "{w}");
}
}
#[test]
fn every_warp_preset_renders_text_inside_the_slide() {
let o = RenderOpts { scale: 0.5, ..Default::default() };
for name in
["textArchUp", "textArchDown", "textCircle", "textButton", "textWave1", "textRingInside", "textCirclePour", "textDeflateInflateDeflate"]
{
let mut p = wordart(Some(name), "One line\nTwo line\nThree");
if let Some(b) = std::sync::Arc::make_mut(&mut p.slides[0]).shapes[0].text.as_mut() {
b.body.warp_adj = vec![f64::NAN, -1e12];
}
let img = render_slide(&p, 0, &o);
let ((x0, y0, x1, y1), _) = ink(&img);
assert!(x0 <= x1 && y0 <= y1, "{name}: no ink");
}
}

209
crates/render/src/warp.rs Normal file
View File

@ -0,0 +1,209 @@
//! Drawing laid-out text through a WordArt warp ([`deckcraft_geom::warp`]).
//!
//! Glyph outlines are placed in layout space, flattened, cut into short segments and every point
//! is mapped through the warp, so straight glyph edges bend with the guides. Underlines and
//! highlights are warped the same way.
use deckcraft_geom::warp::{Warp, WarpLine};
use deckcraft_text::{GlyphRun, TextLayout};
use kurbo::{Affine, BezPath, PathEl, Point, Rect, Shape as _};
use vello_cpu::{RenderContext, peniko};
use crate::{ParaState, color, glyph, scale_of, text_transform};
/// Most points one warped glyph may have (a hostile size or zoom can't explode the work).
const MAX_POINTS: usize = 40_000;
/// The line of `l` a glyph of paragraph `para` on baseline `y` belongs to.
fn line_of(l: &TextLayout, para: usize, y: f64) -> Option<usize> {
let mut best: Option<(usize, f64)> = None;
for (i, li) in l.lines.iter().enumerate().filter(|(_, li)| li.para == para) {
let inside = y >= li.top - 0.01 && y <= li.bottom + 0.01;
let d = if inside { 0.0 } else { (li.baseline - y).abs() };
if best.is_none_or(|(_, bd)| d < bd) {
best = Some((i, d));
}
}
best.map(|(i, _)| i)
}
/// Where a line meets a follow guide, above its baseline: 3/8 of the way up the font's
/// ascent + descent box (measured on Arial, Times New Roman and Courier New in PowerPoint).
fn ref_offset(run: &GlyphRun) -> f64 {
let f = &run.face;
let k = run.size / f.upem.max(1.0);
((0.375 * (f.ascent + f.descent) - f.descent) * k).clamp(-run.size, run.size)
}
/// `path` flattened with tolerance `tol`, cut into pieces of at most `seg` and mapped by `f`.
fn warp_path(path: &BezPath, tol: f64, seg: f64, f: &dyn Fn(Point) -> Point) -> BezPath {
let mut out = BezPath::new();
let mut last: Option<Point> = None;
let mut start: Option<Point> = None;
let mut budget = MAX_POINTS;
let segment = |out: &mut BezPath, a: Point, b: Point, budget: &mut usize| {
let n = ((b - a).hypot() / seg).ceil();
let n = if n.is_finite() { (n as usize).clamp(1, 512) } else { 1 };
for i in 1..=n {
if *budget == 0 {
return;
}
*budget -= 1;
out.line_to(f(a.lerp(b, i as f64 / n as f64)));
}
};
kurbo::flatten(path.iter(), tol, |el| match el {
PathEl::MoveTo(p) => {
if let (Some(a), Some(s)) = (last, start)
&& (a - s).hypot() > 1e-9
{
segment(&mut out, a, s, &mut budget);
}
out.move_to(f(p));
last = Some(p);
start = Some(p);
}
PathEl::LineTo(p) => {
if let Some(a) = last {
segment(&mut out, a, p, &mut budget);
}
last = Some(p);
}
PathEl::ClosePath => {
if let (Some(a), Some(s)) = (last, start) {
segment(&mut out, a, s, &mut budget);
}
out.close_path();
last = start;
}
_ => {}
});
out
}
struct Item<'a> {
run: &'a GlyphRun,
path: BezPath,
line: usize,
state: ParaState,
}
/// Draw `l` (laid out in text rect `tr`, shape transform `m`) through `warp`.
pub(crate) fn draw(ctx: &mut RenderContext, l: &TextLayout, tr: Rect, m: Affine, paras: &[(usize, ParaState)], warp: &Warp) {
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 n = l.lines.len();
let mut ink: Vec<Option<Rect>> = vec![None; n];
let mut off: Vec<Option<f64>> = vec![None; n];
let mut items: Vec<Item> = Vec::new();
for run in &l.runs {
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 };
for (gid, x, y) in &run.glyphs {
let Some(li) = line_of(l, run.para, *y) else { continue };
if let Some(o) = off.get_mut(li) {
*o = Some(o.map_or(ref_offset(run), |v| v.max(ref_offset(run))));
}
let outline = glyph(&run.face, *gid);
if outline.elements().is_empty() {
continue;
}
let mut path = (*outline).clone();
path.apply_affine(Affine::translate((*x, *y)) * skew * Affine::scale(k));
let b = path.bounding_box();
if !(b.x0.is_finite() && b.y0.is_finite() && b.x1.is_finite() && b.y1.is_finite()) {
continue;
}
if let Some(slot) = ink.get_mut(li) {
*slot = Some(slot.map_or(b, |r| r.union(b)));
}
items.push(Item { run, path, line: li, state: para(run.para) });
}
}
let lines: Vec<WarpLine> = l
.lines
.iter()
.enumerate()
.map(|(i, li)| {
let o = off.get(i).copied().flatten().unwrap_or(0.18 * (li.bottom - li.top));
WarpLine { ink: ink.get(i).copied().flatten(), extent: li.extent, ref_y: li.baseline - o }
})
.collect();
let mapper = warp.mapper(&lines, l.inner);
let px = scale_of(m).max(1e-6) * mapper.zoom();
let tol = (0.1 / px).clamp(1e-4, 2.0);
let seg = (2.0 / px).clamp(1e-3, 50.0);
let deco = |ctx: &mut RenderContext, d: &deckcraft_text::Deco| {
let ps = para(d.para);
if !ps.visible || ps.opacity <= 0.001 {
return;
}
let y = (d.rect.y0 + d.rect.y1) / 2.0;
let Some(li) = line_of(l, d.para, y) else { return };
let path = warp_path(&d.rect.to_path(0.1), tol, seg, &|p| mapper.map(li, p));
ctx.set_transform(m * Affine::translate(ps.offset));
ctx.set_paint(color(d.color, ps.opacity));
ctx.fill_path(&path);
};
for d in l.decos.iter().filter(|d| d.behind) {
deco(ctx, d);
}
for it in &items {
let (run, ps) = (it.run, it.state);
if !ps.visible || ps.opacity <= 0.001 {
continue;
}
let alpha = run.alpha * ps.opacity;
if (alpha <= 0.0 || run.color.a == 0) && run.outline.is_none() {
continue;
}
let path = warp_path(&it.path, tol, seg, &|p| mapper.map(it.line, p));
ctx.set_transform(m * Affine::translate(ps.offset));
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.size * 0.025).with_join(kurbo::Join::Round));
ctx.stroke_path(&path);
}
}
if let Some((oc, ow)) = run.outline {
ctx.set_paint(color(oc, ps.opacity));
ctx.set_stroke(kurbo::Stroke::new(ow.max(0.0)).with_join(kurbo::Join::Round));
ctx.stroke_path(&path);
}
}
for d in l.decos.iter().filter(|d| !d.behind) {
deco(ctx, d);
}
ctx.set_fill_rule(peniko::Fill::NonZero);
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn warp_path_subdivides_and_maps_every_point() {
let mut p = BezPath::new();
p.move_to((0.0, 0.0));
p.line_to((10.0, 0.0));
p.line_to((10.0, 10.0));
p.close_path();
let out = warp_path(&p, 0.01, 1.0, &|q| Point::new(q.x, q.y + q.x * q.x * 0.01));
// 10 + 10 + ~15 pieces of at most 1 pt.
let n = out.elements().len();
assert!(n > 30, "{n}");
// The first edge is bent onto the parabola.
let mid = out.elements().iter().find_map(|e| if let PathEl::LineTo(q) = e { (q.x == 5.0).then_some(*q) } else { None });
assert_eq!(mid, Some(Point::new(5.0, 0.25)));
// A huge path with a tiny segment length stays bounded.
let mut big = BezPath::new();
big.move_to((0.0, 0.0));
for i in 0..1000 {
big.line_to((1e6 * (i % 2) as f64, i as f64));
}
let out = warp_path(&big, 0.01, 1e-3, &|q| q);
assert!(out.elements().len() <= MAX_POINTS + 2);
}
}

View File

@ -1074,7 +1074,9 @@ fn layout_scaled(ctx: &Ctx, shape: &Shape, body: &TextBody, bp: &BodyProps, opts
(r.x1 - bp.inset_r.unwrap_or(7.2)).max(r.x0 + bp.inset_l.unwrap_or(7.2)),
(r.y1 - bp.inset_b.unwrap_or(3.6)).max(r.y0 + bp.inset_t.unwrap_or(3.6)),
);
let wrap = bp.wrap.unwrap_or(true) && !matches!(bp.autofit, Some(AutoFit::Shape) if shape.text_box && !bp.wrap.unwrap_or(true));
// Text that follows a WordArt arch or circle is set on one line per paragraph.
let follow = bp.warp.as_deref().is_some_and(deckcraft_geom::warp::is_follow);
let wrap = bp.wrap.unwrap_or(true) && !follow && !matches!(bp.autofit, Some(AutoFit::Shape) if shape.text_box && !bp.wrap.unwrap_or(true));
let ncols = bp.columns.unwrap_or(1).clamp(1, 16) as usize;
let col_gap = bp.col_spacing.unwrap_or(0.0).max(0.0);
let col_w = ((inner.width() - col_gap * (ncols as f64 - 1.0)) / ncols as f64).max(1.0);

View File

@ -69,7 +69,7 @@ the round trip even though DeckCraft doesn't model it.
| Effects: shadow, glow, soft edges, reflection | yes | yes | |
| 3-D: `scene3d`, `sp3d` | kept | kept | Not rendered |
| Text: runs, paragraphs, bullets, numbering, levels, autofit, columns, vertical, RTL, script fonts, fields, hyperlinks | yes | yes | Round-trip tests incl. `justLow` and date fields |
| Text warp (`prstTxWarp`) | yes | yes | Not rendered |
| Text warp (`prstTxWarp`) | yes | yes | All 40 presets rendered (`crates/geom/src/warp.rs`); adjust values (`avLst`) round-trip |
| Pictures with crop, recolour, duotone, alpha, luminance | yes | yes | |
| Tables with styles | yes | yes | |
| Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw` |
@ -99,4 +99,5 @@ the round trip even though DeckCraft doesn't model it.
| Date | Change | Summary |
|---|---|---|
| 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
| 2026-10-10 | major | Created from PowerPoint 16.113.4's `CFBundleDocumentTypes`, `crates/pptx` reader/writer and tests, and the open round-trip issues |

View File

@ -165,9 +165,13 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
- **Estimate:** 4–6 h.
### Edit points, text warp, 3-D
- **Evidence:** checklist rows "Edit points" (P1 missing), "Text warp transforms", "Bevel and 3-D
rotation" (missing; `scene3d`/`sp3d` kept as raw XML on round trip).
- **Estimate:** 4–6 h (edit points), 6–10 h (warp), 8–12 h (3-D render approximation).
- **Evidence:** checklist rows "Edit points" (P1 missing), "Text warp transforms" (partial: all 40
`prstTxWarp` presets render and their adjusts round-trip, but there is no Transform gallery or
command to apply one, no adjust handles, and arc/circle placement can differ from PowerPoint by
1–3 % of the path length), "Bevel and 3-D rotation" (missing; `scene3d`/`sp3d` kept as raw XML on
round trip).
- **Estimate:** 4–6 h (edit points), 2–4 h (warp gallery, command and handles), 8–12 h (3-D render
approximation).
### Proofing: spelling, thesaurus, AutoCorrect
- **Evidence:** `review.spelling` checks a small built-in list of frequent misspellings
@ -247,5 +251,6 @@ Detail in [localization-parity.md](localization-parity.md).
| Date | Change | Summary |
|---|---|---|
| 2026-10-12 | minor | Text warps render (all 40 presets, adjusts round-trip); the warp gap is now the gallery, command and handles |
| 2026-10-10 | minor | Noted that no gap blocks alpha (core-workflow gate passes) |
| 2026-10-10 | major | Created: every gap from the 2026-10-10 re-measure and the 16 open GitHub issues, ranked, with beta blockers marked |

View File

@ -9,7 +9,7 @@ The summary between `<!-- SUMMARY -->
|---|---|---|---|---|---|
| P0 | 72 | 60 | 12 | 0 | 92% |
| P1 | 65 | 38 | 21 | 6 | 75% |
| P2 | 54 | 13 | 13 | 28 | 36% |
| P2 | 54 | 13 | 14 | 27 | 37% |
| Area | Parity |
|---|---|
@ -18,7 +18,7 @@ The summary between `<!-- SUMMARY -->
| Slides | 90% |
| Views | 90% |
| Masters & themes | 85% |
| Shapes | 86% |
| Shapes | 88% |
| Format | 81% |
| Arrange | 100% |
| Text | 80% |
@ -115,7 +115,7 @@ Open P0 items: Start screen (new, templates/themes, recent), Contextual tabs (Sh
| Shapes | Change shape | P1 | D |
| Shapes | Text boxes | P0 | D |
| Shapes | WordArt | P1 | P |
| Shapes | Text warp transforms | P2 | M |
| Shapes | Text warp transforms | P2 | P |
| Shapes | Shape quick styles | P1 | D |
| Shapes | Set as default shape | P2 | D |
| Format | Solid fill and transparency | P0 | D |