src/com.mocharealm.accompanist.lyrics.text/SdfAtlasManager

SdfAtlasManager

actual class SdfAtlasManager(atlasWidth: Int, atlasHeight: Int)

Android implementation of SDF atlas manager for text rendering.

Manages two atlas bitmaps:

  • Normal atlas: Pre-processed alpha for crisp text edges

  • Shadow atlas: Pre-processed alpha for smooth shadow/glow effects

SDF processing is performed in Rust for optimal performance:

  • A channel: normal text alpha

  • G channel: shadow alpha

Parameters

atlasWidth

Width of the atlas texture in pixels

atlasHeight

Height of the atlas texture in pixels

expect class SdfAtlasManager(atlasWidth: Int, atlasHeight: Int)

Manages the SDF atlas texture for text rendering. This is a platform-specific implementation that handles:

  • Atlas texture creation and updates

  • Drawing glyphs from the atlas using SDF techniques

actual class SdfAtlasManager(atlasWidth: Int, atlasHeight: Int)

JVM/Desktop implementation of SDF atlas manager for text rendering.

Manages two atlas images:

  • Normal atlas: Pre-processed alpha for crisp text edges

  • Shadow atlas: Pre-processed alpha for smooth shadow/glow effects

SDF processing is performed in Rust for optimal performance:

  • A channel: normal text alpha

  • G channel: shadow alpha

Parameters

atlasWidth

Width of the atlas texture in pixels

atlasHeight

Height of the atlas texture in pixels

Constructors

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actual constructor(atlasWidth: Int, atlasHeight: Int)
expect constructor(atlasWidth: Int, atlasHeight: Int)
actual constructor(atlasWidth: Int, atlasHeight: Int)

Properties

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actual val height: Int
expect val height: Int

The height of the atlas texture in pixels.

actual val height: Int
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actual val width: Int
expect val width: Int

The width of the atlas texture in pixels.

actual val width: Int

Functions

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actual fun clearFallbackFonts()

Clears fallback fonts. No-op: use NativeTextEngine.clearFallbackFonts instead.

expect fun clearFallbackFonts()

Clears all loaded fallback fonts.

actual fun clearFallbackFonts()

Clears fallback fonts. No-op: use NativeTextEngine.clearFallbackFonts instead.

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actual fun destroy()

Releases all resources associated with the atlas.

expect fun destroy()

Releases all resources associated with the atlas.

actual fun destroy()

Releases all resources associated with the atlas.

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actual fun DrawScope.drawGlyph(atlasRect: Rect, destOffset: Offset, destSize: Size, color: Color, shadow: Shadow?)

Draws a glyph from the atlas to the canvas with optional shadow.

expect fun ERROR CLASS: Symbol not found for DrawScope.drawGlyph(atlasRect: ERROR CLASS: Symbol not found for Rect, destOffset: ERROR CLASS: Symbol not found for Offset, destSize: ERROR CLASS: Symbol not found for Size, color: ERROR CLASS: Symbol not found for Color, shadow: ERROR CLASS: Symbol not found for Shadow?? = null)

Draws a glyph from the atlas to the canvas. Uses SDF rendering for crisp text at any scale.

actual fun DrawScope.drawGlyph(atlasRect: Rect, destOffset: Offset, destSize: Size, color: Color, shadow: Shadow?)

Draws a glyph from the atlas to the canvas with optional shadow.

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actual fun isReady(): Boolean

Checks if the atlas is ready for rendering.

expect fun isReady(): Boolean

Checks if the atlas is ready for rendering.

actual fun isReady(): Boolean

Checks if the atlas is ready for rendering.

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actual fun loadFallbackFont(fontBytes: ByteArray)

Loads a fallback font. No-op: use NativeTextEngine.loadFallbackFont instead.

expect fun loadFallbackFont(fontBytes: ByteArray)

Loads a fallback font for missing glyphs. Fallback fonts are tried in the order they are loaded.

actual fun loadFallbackFont(fontBytes: ByteArray)

Loads a fallback font. No-op: use NativeTextEngine.loadFallbackFont instead.

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actual fun loadFont(fontBytes: ByteArray)

Loads the primary font. No-op: use NativeTextEngine.loadFont instead.

expect fun loadFont(fontBytes: ByteArray)

Loads the primary font for text rendering.

actual fun loadFont(fontBytes: ByteArray)

Loads the primary font. No-op: use NativeTextEngine.loadFont instead.

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actual fun updateAtlas(uploads: List<GlyphUpload>)

Updates the atlas textures with pending glyph uploads from the native engine.

expect fun updateAtlas(uploads: List<GlyphUpload>)

Updates the atlas texture with pending uploads from the native engine. Call this before drawing if the engine has pending uploads.

actual fun updateAtlas(uploads: List<GlyphUpload>)

Updates the atlas textures with pending glyph uploads from the native engine.

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