Struct LayerCompositor 

pub struct LayerCompositor;

Composites a stack of BlendLayers onto a destination buffer.

Implementations

impl LayerCompositor

pub fn blend_layers( _device: &GpuDevice, layers: &[BlendLayer<'_>], output: &mut [u8], width: u32, height: u32, ) -> Result<()>

Composite layers (bottom-to-top order) into output.

• output must be width * height * 4 bytes and is pre-cleared to transparent black before compositing begins.
• All layers must have the same width × height dimensions as the output buffer.

device is kept as a parameter for future GPU compute shader dispatch; the current implementation is a CPU-parallel fallback.

Errors

Returns an error if:

• output is not width * height * 4 bytes.
• Any layer has mismatched dimensions.
• Dimensions are zero or exceed 16 384.

pub fn blend_layers_cpu( layers: &[BlendLayer<'_>], output: &mut [u8], width: u32, height: u32, ) -> Result<()>

CPU-only variant — useful for unit tests and CPU fallback paths.

Errors

Same conditions as blend_layers.