refactor: backend extension traits, test coverage, JS events, ASAN fix

[AndrewAltimit]

Summary

• Backend trait refactor: Split SdiBackend (39 methods) into 8 focused extension traits (SdiShapes, SdiGradients, SdiAlpha, SdiText, SdiTextures, SdiClipTransform, SdiVector, SdiBatch) with blanket impls. Phase 1 -- additive only, no breaking changes. Removed dead draw_text_weighted method.

• ~200 new tests across platform-critical code:

  • Input mapping: SDL (13), WASM (19), PSP (15), UE5 (8) -- extracted pure helpers (scale_point_math, analog_to_cursor_delta, apply_deadzone)
  • Color/pixel conversion: PSP ABGR (20), UE5 RGBA/lerp/clip (28)
  • Video demux: 21 error path tests (truncated headers, missing atoms, empty tables)
  • Streaming: 28 tests with extracted should_throttle_pure() and linear_seek_interpolation() helpers

• Browser JS runtime: Retain JsEngine beyond page load, event bubbling via __oasis_dispatch_with_bubbling (target to root with stopPropagation/preventDefault), hit-test clicks through layout tree to dispatch to JS listeners. 8 new event dispatch tests.

• ASAN fix: Remove CFLAGS="-fsanitize=address" from memory-ci (SDL3 C code conflicted with Rust's ASan runtime). Expand memory-ci PR trigger paths. Add advisory nightly clippy to PR validation. Fix unused_comparisons warning in oasis-vector.

• Docs: Update SdiBackend method counts (30 to 39) across CLAUDE.md, design.md, ADR 003, AGENTS.md.

Verified

• cargo clippy --workspace -- -D warnings clean
• cargo test --workspace -- all passing, 0 failures
• cargo fmt --all -- --check clean
• PSP EBOOT builds (cargo +nightly psp --release)
• WASM builds (build-wasm.sh --release)

Test plan

• CI pipeline passes (format, clippy, test, build, screenshot, cargo-deny)
• Memory analysis workflow triggers on PR and ASAN passes without runtime conflict
• Nightly clippy advisory step runs in PR validation
• JS event dispatch: pages with addEventListener("click", ...) fire callbacks on click
• Extension traits importable and usable by downstream code

Generated with Claude Code

[github-actions]

Gemini AI Code Review

Issues (if any)

• [BUG] crates/oasis-types/src/backend.rs:1700 - SdiVector default implementations render bounding boxes instead of shapes
  • ext_fill_polygon, ext_stroke_polygon, ext_fill_arc, and ext_stroke_arc were changed to draw fill_rect bounding boxes instead of proper triangulations/lines, producing corrupted blocks.
  • How to fix: Make SdiShapes a supertrait of SdiVector (pub trait SdiVector: SdiShapes) so defaults can call ext_fill_triangle and ext_draw_line.

Previous Issues (for incremental reviews)

(none)

Suggestions (if any)

• crates/oasis-types/src/backend.rs:1255 - Extension traits redefine copies of complex rendering logic (e.g. ext_draw_line's Bresenham algorithm). Consider extracting these into free functions to avoid duplication between SdiBackend and the new extension traits.

Notes

• Extraction of pure functions like scale_point_math and should_throttle_pure provides good test coverage without heavy mock trait implementations.
• js_engine and js_doc retention in BrowserWidget correctly overwrites Rc instances on subsequent page loads, avoiding memory leaks.

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Generated by Gemini AI (gemini-3.1-pro-preview). Supplementary to human reviews.

[AndrewAltimit]

Review Response Agent (Iteration 1)

Status: No changes needed

Fixed Issues

• [BUG] SdiVector default implementations render bounding boxes instead of shapes (backend.rs:1733): Changed SdiVector supertrait from SdiCore to SdiShapes, enabling defaults to use ext_fill_triangle (triangle fan decomposition) for ext_fill_polygon/ext_fill_arc and ext_draw_line for ext_stroke_polygon/ext_stroke_arc instead of crude fill_rect bounding boxes.

Ignored Issues

• [SUGGESTION] Extract Bresenham algorithm into free functions: This is a code quality suggestion, not a bug. The duplication between SdiBackend and extension traits is intentional (blanket impls delegate to SdiBackend, defaults are standalone fallbacks). Extracting would add complexity for marginal benefit.

Deferred to Human

• (none)

Notes

• Build, clippy, and all tests pass cleanly after the change.
• The fix only affects fallback rendering for backends that implement SdiShapes but not SdiBackend. All SdiBackend implementors get the blanket impl which delegates to the full SdiBackend methods unchanged.

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The agent reviewed feedback but determined no code changes were required.

[github-actions]

Gemini AI Incremental Review

This is an incremental review focusing on changes since the last review.

Issues (if any)

• [BUG] crates/oasis-types/src/backend.rs:1835 - ext_stroke_line_dashed default implementation is broken

  • Ignores dash and gap parameters (renders solid lines), only handles horizontal/vertical lines, silently draws nothing for diagonal lines.
  • How to fix: Reimplement using distance/interpolation math from SdiBackend::stroke_line_dashed; replace self.draw_line with self.ext_draw_line.

• [BUG] crates/oasis-types/src/backend.rs:1770 - ext_stroke_polygon and ext_stroke_arc ignore stroke width

  • Both accept width: u16 (prefixed _width) but hardcode width 1 when calling self.ext_draw_line.
  • How to fix: Pass width to ext_draw_line.

• [BUG] crates/oasis-types/src/backend.rs:1790 - ext_fill_arc and ext_stroke_arc hardcode segment counts and use floating-point trig directly

  • Hardcoding segments = 16 creates blocky arcs at large radii. Using f32::sin()/f32::cos() directly can cause no_std compilation failures.
  • How to fix: Use arc_segments(radius, ...) for dynamic segment count; use sin_approx_f32/cos_approx_f32 for vertices.

Previous Issues (for incremental reviews)

• [RESOLVED] crates/oasis-types/src/backend.rs:1700 - SdiVector default implementations render bounding boxes instead of shapes

Suggestions (if any)

• crates/oasis-types/src/backend.rs:1052 - Extension traits redefine copies of complex rendering logic (e.g. ext_draw_line's Bresenham algorithm). Consider extracting into free functions to avoid duplication between SdiBackend and the new extension traits.

Notes

• The previous issue was successfully addressed by changing the supertrait to SdiShapes, allowing SdiVector to use ext_fill_triangle and ext_draw_line.
• The newly implemented fallback methods in SdiVector introduced logic errors (ignoring parameters, hardcoding values, missing diagonal line support) that need to be addressed.

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Generated by Gemini AI (gemini-3.1-pro-preview). Supplementary to human reviews.

[AndrewAltimit]

Review Response Agent (Iteration 2)

Status: Changes committed, pushing...

Commit: 3e1d39a

Fixed Issues

• [BUG] ext_stroke_polygon and ext_stroke_arc ignore stroke width (backend.rs:1755,1804): Changed _width to width and passed it through to ext_draw_line instead of hardcoded 1.
• [BUG] ext_fill_arc and ext_stroke_arc hardcode segment count and use f32 trig (backend.rs:1779,1804): Replaced hardcoded segments = 16 with arc_segments(radius, start_angle, end_angle) for dynamic segment counts. Replaced f32::cos()/f32::sin() with cos_approx_f32/sin_approx_f32 for no_std compatibility. Aligned iteration pattern with SdiBackend versions (prev_x/prev_y tracking with 1..=segments range).
• [BUG] ext_stroke_line_dashed is broken (backend.rs:1830): Replaced stub that ignored dash/gap and only handled axis-aligned lines with proper distance/interpolation math matching SdiBackend::stroke_line_dashed. Now supports diagonal lines and respects dash/gap parameters. Uses ext_draw_line instead of fill_rect.

Ignored Issues

• [SUGGESTION] Extract Bresenham algorithm into free functions: Code quality suggestion, not a bug. Already addressed by admin in iteration 1 — intentional duplication between blanket impls and standalone fallbacks.

Deferred to Human

• (none)

Notes

• All three fixes align the SdiVector trait default implementations with their SdiBackend counterparts, ensuring consistent behavior for backends that implement SdiShapes but not full SdiBackend.
• The blanket impl<T: SdiBackend> SdiVector for T is unaffected — it delegates directly to SdiBackend methods.
• Build, clippy (-D warnings), and all 4,832 workspace tests pass cleanly.

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Automated summary of agent fixes.

[github-actions]

Gemini AI Incremental Review

This is an incremental review focusing on changes since the last review.

Previous Issues (for incremental reviews)

• [RESOLVED] crates/oasis-types/src/backend.rs:1835 - ext_stroke_line_dashed default implementation is broken (now accurately implements distance math, dash/gap lengths, and supports diagonal lines)
• [RESOLVED] crates/oasis-types/src/backend.rs:1770 - ext_stroke_polygon and ext_stroke_arc ignore stroke width (now correctly passes the width parameter to ext_draw_line)
• [RESOLVED] crates/oasis-types/src/backend.rs:1790 - ext_fill_arc and ext_stroke_arc hardcode segment counts and use floating-point trig directly (now uses dynamic arc_segments and no_std-friendly _approx_f32 functions)

Issues (if any)

(none)

Suggestions (if any)

• crates/oasis-types/src/backend.rs:1500 - In ext_draw_text_ellipsis, measuring characters individually inside the loop via &text[i..i + ch.len_utf8()] is functional but requires high measurement overhead. If this fallback is heavily utilized, consider accumulating character widths or measuring a growing slice instead.

Notes

• The refactoring maintains backwards compatibility perfectly. The blanket implementations impl<T: SdiBackend + ?Sized> Sdi[Ext] for T cleanly bridge the new modular extension traits to the monolithic SdiBackend, avoiding breaking changes for existing backends.
• SdiVector::ext_fill_polygon now properly uses fan triangulation (ext_fill_triangle) instead of fill_rect bounding boxes.
• Moving the .pre-commit-config.yaml format/lint hooks from Docker to local bash execution is a solid quality-of-life improvement for commit speeds.

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Generated by Gemini AI (gemini-3.1-pro-preview). Supplementary to human reviews.

[AndrewAltimit]

Review Response Agent (Iteration 3)

Status: No changes needed

Fixed Issues

• (none - all previous issues were already resolved in iteration 1)

Ignored Issues

• [SUGGESTION] ext_draw_text_ellipsis per-character measurement overhead (backend.rs:1503): This is a minor performance suggestion for a fallback code path. The current approach of measuring individual characters is functionally correct and matches how text measurement works with variable-width fonts. Not a bug.

Deferred to Human

• (none)

Notes

• The latest Gemini review (iteration 2) reports zero issues — all three bugs from the previous review are marked RESOLVED.
• The only new feedback is a performance suggestion about ext_draw_text_ellipsis, which is speculative optimization for a fallback path.
• No code changes needed for this iteration.

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The agent reviewed feedback but determined no code changes were required.