feat(imgproc): no_std support for the imgproc module (Phase 2) - #88
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Un-gates `imgproc` (and its prelude re-exports) for no_std builds; the module now compiles with only core + alloc. Refs #84 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Converts std:: paths to their core:: equivalents and adds alloc imports (vec/Vec/format/ToString) plus num_traits::Float where concrete f32/f64 math is used, so scalar fallbacks build without std. No behavior change. Refs #84 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Makes the
imgprocmodule compile underno_std + allocwith--no-default-features, using scalar fallbacks (parallel & SIMD disabled). Second step of #82, building on Phase 1 (#83).imgprocis un-gated inlib.rsand now builds with onlycore+alloc. The change is almost entirely mechanical:std::paths → theircore::equivalents (any::TypeId,iter::Sum,slice::from_raw_parts,f64::consts::PI,cmp::Ordering,cmp::Reverse)alloc::{vec, vec::Vec, format, string::ToString}imports where usedf32/f64math (sqrt,floor,round,exp,atan2, …) resolves throughnum_traits::Float(libm) in no_std builds, same pattern as corehough_lines_p(probabilistic Hough) is gated behindstd: it shuffles edge points with the thread-local RNG (rand_shuffle), which stays std-only until a no_std seedable RNG lands (a Phase-1 follow-up, see Feature request: no-std support so purecv can run on microcontrollers such a esp32 #82). The deterministichough_linesremains available on no_std.Rayon (
parallel) andpulp(simd) were already feature-gated and both implystdsince Phase 1, so they compile out on bare metal with no further work — the scalar path is the sequential branch that was always there.The
crates/no-std-smokeconsumer now also exercisesgaussian_blur, and the CIno_std Buildjob (already building--no-default-featuresforthumbv7em-none-eabihf) now covers imgproc too.Verified: 308 lib + 40 doctests pass with default features; clippy/fmt clean on no-default / default / simd+parallel; builds for
thumbv7em-none-eabihf; and the ESP32-S3 example runs correctly on real hardware against this tree.Out of scope (Phase 3, #85): video and calib3d.
Closes #84
Refs #82
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