resources: re-encode Android day-cycle scenes as WebP (−1.4 MB, ~86%)#48
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The same scene1..scene10 backdrops in res/drawable-nodpi shipped as PNG (~1.7MB). Re-encode as WebP (quality 85) -> ~0.24MB, an 86% reduction, no code change: drawables are referenced by name (R.drawable.sceneN via painterResource in SceneHeroBackground.kt) so the resource name is unchanged and Android decodes WebP natively. Companion to the iOS HEIC change (#46).
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What & why
Android ships the same day-cycle scene backdrops (
scene1…scene10, inres/drawable-nodpi/) as PNG — ~1.7 MB. Re-encoding as WebP (quality 85) drops that to ~0.24 MB — an 86% / ~1.4 MB reduction, with no code change: the drawables are referenced by name (R.drawable.sceneNviapainterResource—SceneHeroBackground.kt), so the resource name is unchanged and Android decodes WebP natively.WebP is the Android-native efficient image format (decode since API 14, first-class
res/drawableresource, and what Android Studio's Convert to WebP… produces).Companion to the iOS HEIC change in #46 — same win, platform-native format each side.
Verification
scene10, midday) for sky banding — the hero backdrop is heavily dimmed/masked, so artifacts are invisible there.Checklist
StrandDesigntokens — n/aRe-encoded via an AI-assisted pass; resource names verified and size measured locally. Please sanity-check rendering on a bright scene.