类型 Bitmap

API 文档由 Go 源码生成，内容为英文。

type Bitmap struct {
	Pix           []byte
	Width, Height int
	Stride        int
	ID            uint64
	Version       uint32
}

Bitmap is immutable premultiplied BGRA pixel data. Pixels are stored top row first; Stride is bytes between rows and must be at least Width*4. The caller owns Pix and must keep it unchanged while a canvas can retain it. Native renderers upload the pixels lazily and identify unchanged content by ID and Version, so mutating Pix requires incrementing Version.