Module bitmap 

Pixel buffers and the anti-aliasing scratch buffer.

Bitmap<P> replaces SplashBitmap with a clean, always-top-down, typed-generic alternative. Key differences from the C++ original:

• rowSize is always positive (no bottom-up layout).
• Typed row access via bytemuck::cast_slice — zero-copy, no mode switch.
• Alpha is an Option<Vec<u8>> separate plane (matching C++ layout).

AaBuf is the 1-bit supersampled scratch buffer used by the AA fill path. It is 4 rows × (bitmap_width × 4) columns, MSB-first packed.

Structs

AaBuf

Anti-aliasing scratch buffer: 4 rows × (bitmap_width × 4) columns, 1 bit/pixel.

Bitmap

A typed, top-down pixel buffer.

BitmapBand

A mutable view into a horizontal band of a Bitmap.

Enums

AnyBitmap

A mode-erased bitmap, used when the transparency group stack must store bitmaps of varying pixel types without monomorphizing the entire stack.