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feat(plugin): expose the slicing print-graph as raw orca.host classes + Twistify sample

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Adds PluginHostSlicing, which registers the print-graph data model (Print,
PrintObject, Layer, LayerRegion, Surface, ExPolygon, extrusions, ...) into the
orca.host submodule in the same raw-class style as PluginHostApi's Model/Preset
graph, with shared helpers in PluginBindingUtils. SlicingPipelinePluginCapability
is trimmed to the capability surface (the standalone SlicingNumpy helper is folded
away). Adds the Twistify example plugin next to Inset and broadens the binding,
hook, and plugin-install tests.
This commit is contained in:
SoftFever
2026-07-08 00:05:28 +08:00
parent aafcccc83c
commit f81a24abfb
29 changed files with 1718 additions and 962 deletions
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19
src/libslic3r/Print.cpp
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@@ -2330,6 +2330,17 @@ void Print::process(long long *time_cost_with_cache, bool use_cache)
const bool was_done = obj->is_step_done(posSlice);
obj->slice();
hook_after(obj, was_done, posSlice, SlicingPipelineStep::Slice);
// re-snapshot each layer's raw_slices AFTER the Slice hook ran, so the
// plugin's mutation becomes the untyped baseline. Without this, a later
// perimeter-only re-run (make_perimeters -> restore_untyped_slices) reverts
// slices to the PRE-hook geometry while posSlice stays cached (the hook does
// not re-fire), silently un-applying the mutation; raw_slices consumers
// (sharp-tail support, ToolOrdering) also read this backup directly. Gated on
// an active plugin AND a genuine (re)slice, so the inactive path is untouched
// and re-backing-up an unmutated layer is a harmless identical copy.
if (m_pipeline_plugin_active && !was_done && obj->is_step_done(posSlice))
for (Layer *layer : obj->layers())
layer->backup_untyped_slices();
} else {
if (obj->set_started(posSlice)) obj->set_done(posSlice); // shared/duplicate — no hook
}
@@ -2356,6 +2367,14 @@ void Print::process(long long *time_cost_with_cache, bool use_cache)
}
for (PrintObject *obj : m_objects) {
if (need_slicing_objects.count(obj) != 0) {
// split prepare_infill (fill-surface prep) from infill (make_fills) so a
// plugin can mutate fill surfaces at the PrepareInfill seam and have make_fills
// consume them (unlike the Infill seam, which fires after the fills are already
// built). infill() re-invokes prepare_infill() as a no-op once posPrepareInfill
// is DONE, so this is a mechanical split mirroring the slice/perimeters loop.
const bool prepare_was_done = obj->is_step_done(posPrepareInfill);
obj->prepare_infill();
hook_after(obj, prepare_was_done, posPrepareInfill, SlicingPipelineStep::PrepareInfill);
const bool was_done = obj->is_step_done(posInfill);
obj->infill();
hook_after(obj, was_done, posInfill, SlicingPipelineStep::Infill);