mirror of
https://github.com/storytold/figcraft.git
synced 2026-11-01 06:16:46 -06:00
BFlat
7fdbda9f09
* M8: one depth cap for a whole render; render threads get 8 MiB stacks (#1082) A pattern fill drew its source as a fresh render from depth 0, so patterns in patterns could stack three renders of 256 levels. The source now goes on from the depth of the layer it fills. A render level takes about 6.5 KB of stack (measured), about 1.7 MB at the cap: the canvas render, preview and save threads and a band pool of their own now get 8 MiB stacks instead of the default 2 MiB. * M8: SVG and PDF exports carry the depth into pattern sources and embedded renders (#1082)
83 lines
3.3 KiB
Rust
83 lines
3.3 KiB
Rust
//! Pattern fills: the source layer drawn into one repeating cell at the resolution it shows at,
|
||
//! repeated by a tiling shader.
|
||
|
||
use std::cell::Cell;
|
||
use std::sync::Arc;
|
||
|
||
use figcraft_color::{PatternCell, PatternPaint};
|
||
use figcraft_doc::{Document, NodeId};
|
||
use figcraft_geom::Affine;
|
||
use tiny_skia::{FilterQuality, Pixmap, SpreadMode, Transform};
|
||
|
||
use crate::draw::{Bounds, Ctx, draw_node};
|
||
use crate::paint::Prepared;
|
||
|
||
/// The largest side of a cell's pixmap; a cell showing larger is drawn coarser.
|
||
const MAX_CELL_PX: f64 = 2048.0;
|
||
/// How deep patterns nest (a source filled with a pattern); deeper ones, and a source filled
|
||
/// with its own pattern, draw nothing.
|
||
pub const MAX_DEPTH: u32 = 2;
|
||
|
||
thread_local! {
|
||
static DEPTH: Cell<u32> = const { Cell::new(0) };
|
||
}
|
||
|
||
/// Run `f` one pattern level deeper; `None` past [`MAX_DEPTH`].
|
||
pub fn nested<T>(f: impl FnOnce() -> Option<T>) -> Option<T> {
|
||
let d = DEPTH.with(Cell::get);
|
||
if d >= MAX_DEPTH {
|
||
return None;
|
||
}
|
||
DEPTH.with(|c| c.set(d + 1));
|
||
let out = f();
|
||
DEPTH.with(|c| c.set(d));
|
||
out
|
||
}
|
||
|
||
/// Pattern `pt` on a `w`×`h` box drawn into one cell at about `scale` device pixels per unit and
|
||
/// `time` seconds into animated GIFs:
|
||
/// the pixmap, the cell and the pixmap's pixels per unit on each axis (whole pixels per cell, so
|
||
/// the repeat lines up exactly).
|
||
pub fn cell_pixmap(doc: &Document, pt: &PatternPaint, w: f64, h: f64, scale: f64, time: f64) -> Option<(Pixmap, PatternCell, (f64, f64))> {
|
||
let src = doc.node(NodeId(pt.source)).filter(|n| !n.is_page())?;
|
||
let cell = pt.cell(src.width, src.height, w, h)?;
|
||
let scale = if scale.is_finite() && scale > 0.0 { scale } else { 1.0 };
|
||
let k = scale.min(MAX_CELL_PX / cell.size.0.max(cell.size.1));
|
||
let (pw, ph) = ((cell.size.0 * k).ceil().clamp(1.0, MAX_CELL_PX), (cell.size.1 * k).ceil().clamp(1.0, MAX_CELL_PX));
|
||
let (kx, ky) = (pw / cell.size.0, ph / cell.size.1);
|
||
let mut pix = Pixmap::new(pw as u32, ph as u32)?;
|
||
let bounds = Bounds::default();
|
||
let ctx = Ctx {
|
||
doc,
|
||
scale: kx.max(ky) * cell.scale,
|
||
outline_mode: false,
|
||
outline: crate::Outline::default(),
|
||
outlined: &[],
|
||
skip: &[],
|
||
lod: false,
|
||
preview: false,
|
||
magnified_image_pixels: false,
|
||
under: None,
|
||
time,
|
||
bounds: &bounds,
|
||
};
|
||
let unrotated = src.transform.inverse();
|
||
// The source is one level below the layer it fills, not a fresh render (#1082).
|
||
let depth = crate::draw::layer_depth() + 1;
|
||
nested(|| {
|
||
for (tx, ty) in &cell.tiles {
|
||
let xf = Affine::scale_non_uniform(kx, ky) * Affine::translate((*tx, *ty)) * Affine::scale(cell.scale) * unrotated;
|
||
draw_node(&ctx, &mut pix, src.id, xf, depth);
|
||
}
|
||
Some(())
|
||
})?;
|
||
Some((pix, cell, (kx, ky)))
|
||
}
|
||
|
||
/// The shader for pattern `pt` on a `w`×`h` box shown at `scale` device pixels per unit.
|
||
pub fn prepare(doc: &Document, pt: &PatternPaint, w: f64, h: f64, scale: f64, time: f64, opacity: f32) -> Option<Prepared> {
|
||
let (pix, cell, (kx, ky)) = cell_pixmap(doc, pt, w, h, scale, time)?;
|
||
let transform = Transform::from_row((1.0 / kx) as f32, 0.0, 0.0, (1.0 / ky) as f32, cell.origin.0 as f32, cell.origin.1 as f32);
|
||
Some(Prepared::Pattern { pixmap: Arc::new(pix), mode: SpreadMode::Repeat, quality: FilterQuality::Bilinear, opacity, transform })
|
||
}
|