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Flattening: an option leaves colorized images to writers that draw them

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Flattening counted every colorized image as transparency, in the art and
in pattern tiles. A new flattener option, keeps_colorize, stops counting
an image colorized with a solid paint whose pixels are grayscale or 1-bit,
for a format whose writer draws such images in their ink. Opacity,
blending modes, opacity masks and effects still flatten them, and pattern
tiles are still expanded for those. The option is off, so exports flatten
as before; the EPS writer that draws colorized images turns it on.

The EPS pattern tile tests now check the exported colors, and a tile
group with opacity for the warning.
This commit is contained in:
dotCooCoo
2026-11-01 00:35:23 +07:00
committed by bflatastic
parent 33ab5adbc2
commit 7b4d6282f1
7 changed files with 86 additions and 31 deletions
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crates/doc/src/node/ops.rs
+8 -2
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@@ -686,6 +686,12 @@ impl Node {
/// stroke opacity below 100%, a blend mode, an opacity mask, effects, transparent gradient
/// stops or a colorized image. Hidden objects show none.
pub fn shows_transparency(&self) -> bool {
self.shows_transparency_with(&|_| true)
}
/// [`Self::shows_transparency`], counting a colorized image by itself only when `colorize`
/// accepts it, for files that write some colorized images in their colorize paint (EPS).
pub fn shows_transparency_with(&self, colorize: &dyn Fn(&Node) -> bool) -> bool {
use vectorcraft_color::Paint;
let see_through = |p: &Paint| matches!(p, Paint::Gradient(g) if g.gradient.stops.iter().any(|s| s.opacity < 1.0));
let effects = |fx: &[crate::Effect]| fx.iter().any(|e| e.visible);
@@ -693,14 +699,14 @@ impl Node {
&& (self.opacity < 1.0
|| self.blend != BlendMode::Normal
|| self.extras().mask.as_ref().is_some_and(|m| !m.disabled)
|| (matches!(self.kind, NodeKind::Image(_)) && self.extras().colorize.is_some())
|| (matches!(self.kind, NodeKind::Image(_)) && self.extras().colorize.is_some() && colorize(self))
|| effects(&self.appearance.effects)
|| self
.appearance
.items
.iter()
.any(|i| i.visible() && (i.opacity() < 1.0 || i.blend() != BlendMode::Normal || see_through(i.paint()) || effects(i.effects())))
|| self.children().is_some_and(|ch| ch.iter().any(|c| c.shows_transparency())))
|| self.children().is_some_and(|ch| ch.iter().any(|c| c.shows_transparency_with(colorize))))
}
}