Project Design Document (PDR)

This internal architecture document mandates the precise structural logic, technical dependencies, caching behaviors, and quality integration required by the AppDimens Dynamic library package.

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1. Traceability & Package Matrix

Core Index: 180 .kt logical components under library/src/main/java/com/appdimens/dynamic/.

Subsystem Domain	Crucial Topologies	Domain Core Strategy	Active Verification Gates
core / common	DimenCache, ResizeMath, DpQualifier	Unified Mathematics & Core cache.	DimenCacheTest, DimenPerformanceTest
compose.scaled	DimenScaled, *Extensions	Base Reference Anchors	StrategyModuleFormulasTest
compose.percent	DimenPercentSpace, DimenPercentPlainPx	Context Fractions	StrategyModuleFormulasTest
compose.geometric	diagonal, perimeter, fit, fill	Shape/Geometric Scaling	StrategyModuleFormulasTest
code.plain	DimenPlainBranch.kt	Raw Context Contextualing	DimenPlainBranchTest
compose.resize	DimenResize	Asymptotic Search Subsystem	DimenResizeCodeUnitTest

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2. Technical System Architecture

2.1 Unified Interaction Flow

flowchart TD
  subgraph Input Context
    UI_Mode[UiModeType]
    Qualifiers[DpQualifier]
    Config[Device Configuration]
  end

  subgraph Processing & Cache Pipeline
    Plumbing(DimenCalculationPlumbing)
    CacheCore[[DimenCache Engine]]
    Constraints{ResizeBound / Fits?}
  end

  subgraph Output Targets
    TreeCompose((Compose Strategy))
    TreeCode((Code Strategy))
  end

  Config --> Plumbing
  Qualifiers --> Plumbing
  UI_Mode --> Plumbing

  Plumbing --> CacheCore
  Plumbing --> Constraints
  Constraints --> TreeCompose & TreeCode
  CacheCore --> TreeCompose & TreeCode

  style CacheCore fill:#2A4365,stroke:#fff,stroke-width:2px,color:#fff

2.2 Cache Anatomy & Thread Engineering

The DimenCache Subsystem calculates, stores, and evaluates layout keys natively using bitwise parameters on primitive vectors to minimize Garbage Collection penalties.

• 64-bit Payload Signature: Keys generated using a complex boolean flag logic including parameters: applyAspectRatio, baseValue(float_bits), CalcType_Enum, DpQualifier, and multiWindowConstraints.
• State Bypass Architecture: Core types (PERCENT, SCALED, DENSITY) natively bypass associative shard writing when aspect ratios are inactive, generating results strictly based on raw mathematics for near-zero timing (refer to PERFORMANCE.md).
• Volatility Pre-rendering: ScreenFactors are preemptively evaluated and hot-swapped during configuration changes, pushing heavy logarithmic calculations completely outside of the Compose recomposition phase.

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3. Asymptotic Resize Constraint Mechanism

The resize layer runs distinct logic isolated from general curves, dedicated exclusively to rendering bounds to physical limits.

sequenceDiagram
    participant UI Component as App Widget
    participant ResizeMath as Resize Core
    participant TestLogic as Fits Predicate

    UI Component->>ResizeMath: Provide (minPx, maxPx, stepPx)
    Note over ResizeMath: Generates FloatArray buffer (No Auto-box)
    ResizeMath->>ResizeMath: buildResizeStepsPx()
    ResizeMath->>TestLogic: Binary Search \(\mathcal{O}(\log N)\)
    loop Constraints Test
        TestLogic-->>ResizeMath: check() against bounds predicate
    end
    ResizeMath-->>UI Component: findLargestFittingResizePx() Result

4. Development Quality & Reliability Matrix

4.1 Release Constraints

1. Module Artifacting: Built and aligned under the standard Kotlin multiplatform mavenPublishing protocol targeting Maven Central.
2. Obfuscation Integrity: Comprehensive ProGuard rules (consumer-rules.pro) ensure public API parity and runtime stability natively.

4.2 Known Technical Risk Mapping

Monitored Technical Risk	Built-In Mitigation & Failsafes
ARM64 Cache Desynchronization	Cache primitives strictly tagged with @Volatile. Active concurrency verified in DimenCacheRaceTest.
R8 Heavy Obfuscation Stripping	Dedicated consumer rules preserving reflection vectors unstripped (Refer to R8-PROGUARD.md)
Dokka HTML API Drift	Scripts provided locally scripts/sync_kdoc_from_dokka_html.py correct ERROR CLASS issues caused by Jetpack Compose compiler nuances.

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5. System Check protocols for Engineering Mates

When modifying structural parameters or curves, engineers must ensure the following baseline protocols are met prior to merging PRs:

• Ensure Code/Compose Parity. Modify the code extension symmetrically when introducing a new Compose builder.
• Execute ./gradlew :library:test and visually cross-check output against DimenPerformanceTest.
• If mutating ScreenFactors, actively adjust bits in DimenCache alongside mathematical models evaluated in MATHEMATICS-AND-CALCULUS.md.