aleleba/vectorcraft
1
0
Fork 0
mirror of https://github.com/storytold/vectorcraft.git synced 2026-11-01 05:37:23 -06:00
Code Issues Packages Projects Releases Wiki Activity

M4.98: freeform gradients export to SVG as images clipped to their shapes

Browse Source 
SVG has no freeform shading: an object's freeform fill or stroke is now
written as an <image> of the colour field over its painted box, sampled
on the grid the canvas uses (twice the box's size in points), clipped to
the shape or to the stroke's outline, with the fill or stroke opacity and
blend mode on the group. Linked image mode writes the PNG next to the
SVG. Character paints keep the linear approximation (with a warning);
gradients along or across strokes stay vector slices. The grid sizing
moved to the colour crate so the canvas and the export share it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
bflatastic
2026-10-05 13:25:16 +07:00
co-authored by Claude Opus 5.5
parent fa3dcab411
commit 33023c5a2b
5 changed files with 255 additions and 45 deletions
Download Patch File Download Diff File Expand all files Collapse all files
crates/render/src/freeform.rs
+3 -15
View File
@@ -11,7 +11,7 @@ use std::collections::HashMap;
use std::hash::{Hash, Hasher};
use std::sync::Arc;
use vectorcraft_color::freeform::{painted_box, spread_scale};
use vectorcraft_color::freeform::{grid_size, painted_box, spread_scale};
use vectorcraft_color::{Color, Freeform, GradientPaint};
use vectorcraft_geom::{Affine, Rect};
use vello_cpu::peniko::{Extend, ImageQuality, ImageSampler};
@@ -19,11 +19,6 @@ use vello_cpu::{Pixmap, RenderContext};
use crate::ink::Ink;
/// Device pixels per grid cell.
const CELL_PX: f64 = 4.0;
/// Fewest and most cells along the box's longer side.
const MIN_CELLS: f64 = 8.0;
const MAX_CELLS: f64 = 256.0;
/// Grids kept before the cache starts over.
const MAX_GRIDS: usize = 128;
@@ -69,19 +64,12 @@ pub(crate) fn rasterize(f: &Freeform, b: Rect, cols: u16, rows: u16, ink: Ink) -
Pixmap::from_parts(data, cols, rows)
}
/// Cells along a side `len` (document units) long whose box's longer side `side` gets `cells`.
fn cells_along(len: f64, side: f64, cells: f64) -> u16 {
(cells * len / side).ceil().clamp(2.0, MAX_CELLS) as u16
}
/// Set freeform gradient `g` on box `bounds` (in the paint's space, which the context's current
/// transform maps to pixels) as the context paint. Returns false for an empty box.
pub(crate) fn set_freeform_paint(ctx: &mut RenderContext, g: &GradientPaint, bounds: Rect, ink: Ink) -> bool {
let Some(b) = painted_box(bounds) else { return false };
let side = b.width().max(b.height());
let device = side * ctx.transform().determinant().abs().sqrt();
let cells = 2f64.powf((device / CELL_PX).max(1.0).log2().ceil()).clamp(MIN_CELLS, MAX_CELLS);
let (cols, rows) = (cells_along(b.width(), side, cells), cells_along(b.height(), side, cells));
let device = b.width().max(b.height()) * ctx.transform().determinant().abs().sqrt();
let (cols, rows) = grid_size(b, device);
let f = g.freeform_on(b);
let k = key(&f, b, cols, rows, ink);
let pm = GRIDS.with(|c| c.borrow().get(&k).cloned()).unwrap_or_else(|| {