Animations and redrawing optimisations

[kunitoki]

This pull request includes a variety of improvements and fixes across the build pipeline, changelog documentation, graphics and animation systems, UI, and developer tooling. The most significant changes focus on enhancing timer and animation precision, optimizing rendering performance, and improving developer workflows for testing and building on multiple platforms.

Build and Tooling Updates

• Updated the GitHub Actions workflow to use android-actions/setup-android@v4 for setting up the Android SDK, ensuring compatibility and access to the latest features. (.github/workflows/build_android.yml) [1] [2] [3]
• Added separate Justfile recipes for running Debug and Release tests for WASM builds, improving clarity and flexibility for CI and local testing. (justfile)

Graphics and Animation System Improvements

• Improved the WaitableTimer implementation for Apple, Linux, and Android to achieve more precise deadlines using cascaded absolute sleeps and a short busy-wait, reducing overshoot and timer slack. The fallback condition-variable wait is now only used on Windows and WebAssembly. (CHANGELOG.md)
• Enhanced SVG and Lottie rendering performance by preparing text layout, gradients, image bounds, and caches during parsing, and by prewarming static geometry and paint caches for Lottie animations. (CHANGELOG.md)
• Optimized AnimationRenderer to avoid unnecessary offscreen rendering for single-reference precompositions and certain layer types, improved mask and precomp caching, and made parent-transform resolution linear and memoized. (CHANGELOG.md)

UI and Rendering Behavior

• Fixed animation repaint requests to ensure frames are only submitted at scheduled deadlines, preventing uncapped render loops and uneven frame pacing. Animation precomposition canvases are now managed with a bounded per-frame scratch pool to avoid unbounded GPU memory usage. (CHANGELOG.md)
• Added a paint method to ConvolutionDemo and CrossoverDemo to draw a consistent background, and removed unnecessary setOpaque(false) calls for clarity. (examples/graphics/source/examples/ConvolutionDemo.h, CrossoverDemo.h) [1] [2] [3] [4]

Animation Parsing Optimizations

• Updated Lottie shape parsing to eagerly build static paths for ellipses, rectangles, Bezier paths, and polystars when all properties are static, reducing per-frame work during playback. (modules/yup_animation/io/yup_LottieReader.cpp) [1] [2] [3] [4]

[codecov]

Codecov Report

❌ Patch coverage is 82.68551% with 98 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.42%. Comparing base (c3cf265) to head (a6f3073).

Files with missing lines	Patch %	Lines
...nimation/renderer/yup_AnimationRenderResources.cpp	44.92%	38 Missing ⚠️
...s/yup_animation/renderer/yup_AnimationRenderer.cpp	83.24%	31 Missing ⚠️
modules/yup_graphics/drawables/yup_Drawable.cpp	86.91%	25 Missing ⚠️
modules/yup_animation/model/yup_AnimationPaint.cpp	90.47%	2 Missing ⚠️
modules/yup_events/timers/yup_Timer.cpp	92.59%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #185      +/-   ##
==========================================
+ Coverage   82.38%   82.42%   +0.03%     
==========================================
  Files         836      837       +1     
  Lines       89418    89656     +238     
==========================================
+ Hits        73666    73896     +230     
- Misses      15752    15760       +8     

Files with missing lines	Coverage Δ
modules/yup_animation/io/yup_LottieReader.cpp	78.20% <100.00%> (+0.59%)	⬆️
modules/yup_animation/model/yup_AnimationLayer.h	71.42% <ø> (ø)
...ules/yup_animation/model/yup_AnimationModifier.cpp	88.63% <100.00%> (+1.45%)	⬆️
...odules/yup_animation/model/yup_AnimationModifier.h	22.72% <ø> (ø)
modules/yup_animation/model/yup_AnimationPaint.h	50.00% <ø> (ø)
..._animation/renderer/yup_AnimationRenderResources.h	75.00% <100.00%> (+8.33%)	⬆️
...les/yup_animation/renderer/yup_AnimationRenderer.h	100.00% <100.00%> (ø)
...dio_gui/displays/yup_SpectrumAnalyzerComponent.cpp	79.87% <100.00%> (ø)
modules/yup_core/threads/yup_WaitableTimer.cpp	100.00% <100.00%> (ø)
modules/yup_core/yup_core.cpp	100.00% <ø> (ø)
... and 11 more

... and 9 files with indirect coverage changes

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