Add rasterLayers module: ephemeral buffer-backed raster layers#133
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Adds a new `rasterLayers` controller so extensions can create client-only raster layers backed by a typed array (RGBA8) buffer and update the pixels as close to realtime as possible: - createEphemeralRasterLayer / updateEphemeralRasterLayer / setEphemeralRasterLayerCoordinates / deleteEphemeralRasterLayer - schema (zod message definitions) + controller + types, wired into the main schema/controller aggregation and the client barrel export - methodWithTransfer helper in lib/interface so the pixel ArrayBuffer is transferred (zero-copy) rather than structured-cloned Companion to felt/felt's ephemeral buffer-raster layer support. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01L1J3UqXizsTiiYRa2Ja4Tx
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Requested by Kevin · Slack thread
Companion to felt/felt#20737. Adds a
rasterLayerscontroller so extensions can emit their own ephemeral, client-only raster layers backed by a typed array buffer and update the pixels as close to realtime as possible.Before: the SDK could only add vector (GeoJSON) ephemeral layers. There was no way to push raw pixels onto the map.
After: an extension can create a client-only raster layer from an RGBA8
ArrayBufferand repeatedly overwrite it to animate the raster in near-realtime (heatmaps, sensor fields, decoded video frames, simulation grids).How it works
src/modules/rasterLayers/(schema.ts+controller.ts+types.ts+index.ts) declaring four methods:createEphemeralRasterLayer,updateEphemeralRasterLayer,setEphemeralRasterLayerCoordinates,deleteEphemeralRasterLayer.modules/main/schema.ts(allModules+AllModules),modules/main/controller.ts(makeController+FeltController), and theclient.tsbarrel export.methodWithTransferhelper inlib/interface.ts: posts the method message with the pixelArrayBufferin thepostMessagetransfer list (zero-copy) instead of structured-cloning it. This detaches the buffer in the caller, so animation loops should allocate a fresh buffer per frame (documented on the controller).minorchangeset.Notes for the felt/felt side
The extension bridge is schema-gated by this package (
handler.ts'sAllMessagesSchemarejects unknown method types), so felt/felt cannot dispatch these methods until this change is published and its pinned@feltmaps/js-sdk-nextversion is bumped.🤖 Generated with Claude Code
https://claude.ai/code/session_01L1J3UqXizsTiiYRa2Ja4Tx
Generated by Claude Code