mirror of
https://github.com/storytold/designcraft.git
synced 2026-11-11 16:30:16 -06:00
Philipp Krüger
a11bd021cd
New designcraft-pptx crate (L3) and file.exportPptx command (File › Export PowerPoint…, CLI --export x.pptx). Each page becomes a slide of native objects: shapes with fills, gradients, strokes and effects, pictures cropped like their frames, native tables, and text boxes. Text keeps DesignCraft's composition by default: composed lines end in line breaks, justified spacing becomes character spacing, and leading becomes percentage line spacing (PowerPoint rounds exact spacing to whole points; its 100% line is 1.2 em for every font). Threaded stories split at their frames and wrapped lines get their own boxes. lineBreaks: reflow writes one box per frame in native columns instead. TrueType fonts are embedded as Embedded OpenType when their licences allow. Objects PowerPoint can't represent (placed PDF/EPS, type on a path, some effects) are rasterised through the existing rasterize_where path. Checked in PowerPoint for Mac and LibreOffice: on the sample magazine, word positions match DesignCraft's PDF to within 0.8 pt horizontally and 1.6 pt vertically.
76 lines
2.2 KiB
Rust
76 lines
2.2 KiB
Rust
//! XML text helpers and DrawingML units.
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/// English Metric Units per point.
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pub const EMU_PER_PT: f64 = 12_700.0;
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/// Points → EMU, saturating (input-derived geometry may be huge or not finite).
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pub fn emu(pt: f64) -> i64 {
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if !pt.is_finite() {
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return 0;
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}
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(pt * EMU_PER_PT).round().clamp(-27_273_042_316_900.0, 27_273_042_316_900.0) as i64
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}
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/// A non-negative extent in EMU (DrawingML rejects negative sizes).
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pub fn emu_len(pt: f64) -> i64 {
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emu(pt).max(0)
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}
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/// Degrees → DrawingML angle units (60 000ths of a degree), normalised to 0..360°.
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pub fn angle(deg: f64) -> i64 {
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if !deg.is_finite() {
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return 0;
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}
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(deg.rem_euclid(360.0) * 60_000.0).round() as i64 % 21_600_000
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}
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/// A 0..1 fraction → DrawingML percentage units (1000ths of a percent).
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pub fn pct(v: f64) -> i64 {
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if !v.is_finite() {
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return 0;
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}
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(v * 100_000.0).round().clamp(-100_000_000.0, 100_000_000.0) as i64
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}
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/// Escape text for element content and attribute values. Characters XML 1.0 can't hold are
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/// dropped.
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pub fn esc(s: &str) -> String {
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let mut o = String::with_capacity(s.len());
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for c in s.chars() {
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match c {
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'&' => o.push_str("&"),
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'<' => o.push_str("<"),
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'>' => o.push_str(">"),
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'"' => o.push_str("""),
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'\'' => o.push_str("'"),
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'\t' | '\n' | '\r' => o.push(c),
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c if (c as u32) < 0x20 || c == '\u{FFFE}' || c == '\u{FFFF}' => {}
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c => o.push(c),
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}
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}
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o
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}
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/// sRGB 0..1 → `RRGGBB`.
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pub fn hex(rgb: [f32; 3]) -> String {
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let q = |v: f32| (v.clamp(0.0, 1.0) * 255.0).round() as u8;
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format!("{:02X}{:02X}{:02X}", q(rgb[0]), q(rgb[1]), q(rgb[2]))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn units() {
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assert_eq!(emu(1.0), 12_700);
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assert_eq!(emu(f64::NAN), 0);
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assert_eq!(emu_len(-3.0), 0);
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assert_eq!(angle(-90.0), 16_200_000);
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assert_eq!(angle(360.0), 0);
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assert_eq!(pct(0.5), 50_000);
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assert_eq!(esc("a<b & \"c\"\u{1}"), "a<b & "c"");
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assert_eq!(hex([1.0, 0.0, 0.5]), "FF0080");
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}
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}
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