tolelom
c930d4705d
- PNG decoder with self-contained Deflate decompressor (RGB/RGBA) - ECS query3 and query4 for multi-component queries - Capsule collider + GJK/EPA narrow phase for convex shapes - Coulomb friction in physics solver - Lua engine API bindings (spawn, position, entity_count) Tests: 255 → 286 (+31) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
34 lines
941 B
Markdown
34 lines
941 B
Markdown
# PNG Decoder — Design Spec
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## Overview
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voltex_renderer에 PNG 디코더를 추가한다. Deflate(Huffman+LZ77) 자체 구현으로 외부 의존 없이 PNG 파일을 파싱.
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## Scope
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- PNG 시그니처 + 청크 파싱 (IHDR, IDAT, IEND)
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- 8-bit RGB (color_type=2), 8-bit RGBA (color_type=6)
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- Deflate 디코더 (zlib wrapper + fixed/dynamic Huffman + LZ77)
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- PNG 필터 복원 (None, Sub, Up, Average, Paeth)
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## Out of Scope
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- 인터레이스 (Adam7)
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- 16-bit depth
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- 팔레트 (color_type=3)
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- 그레이스케일 (color_type=0, 4)
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- Adler32 검증
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## Files
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- `crates/voltex_renderer/src/deflate.rs` — inflate (Create)
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- `crates/voltex_renderer/src/png.rs` — parse_png (Create)
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- `crates/voltex_renderer/src/lib.rs` — 모듈 등록 (Modify)
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## Test Plan
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- deflate: inflate fixed Huffman compressed data
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- png filters: each filter type reconstruction
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- parse_png: manually crafted 2x2 PNG roundtrip
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- RGB→RGBA conversion
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