type VarIdx = UInt

pub(all) struct Affine2x3 {
  xx : Int
  yx : Int
  xy : Int
  yy : Int
  dx : Int
  dy : Int
  var_idx_base : UInt?
} derive(Eq, Show, ToJson)

pub struct Color {
  r : Int
  g : Int
  b : Int
  a : Int
} derive(Eq, Show, ToJson)

pub(all) struct ColorLine {
  extend : Int
  stops : Array[ColorStop]
} derive(Eq, Show, ToJson)

pub(all) struct ColorStop {
  offset : Int
  palette_index : Int
  alpha : Int
  var_idx_base : UInt?
} derive(Eq, Show, ToJson)

pub(all) enum Paint {
  ColrLayers(Int, Int)
  Solid(Int, Int, UInt?)
  LinearGradient(ColorLine, Int, Int, Int, Int, Int, Int, UInt?)
  RadialGradient(ColorLine, Int, Int, Int, Int, Int, Int, UInt?)
  SweepGradient(ColorLine, Int, Int, Int, Int, UInt?)
  Glyph(Int, Paint)
  ColrGlyph(Int)
  Transform(Affine2x3, Paint)
  Translate(Int, Int, UInt?, Paint)
  Scale(Int, Int, UInt?, Paint)
  ScaleAroundCenter(Int, Int, Int, Int, UInt?, Paint)
  ScaleUniform(Int, UInt?, Paint)
  ScaleUniformAroundCenter(Int, Int, Int, UInt?, Paint)
  Rotate(Int, UInt?, Paint)
  RotateAroundCenter(Int, Int, Int, UInt?, Paint)
  Skew(Int, Int, UInt?, Paint)
  SkewAroundCenter(Int, Int, Int, Int, UInt?, Paint)
  Composite(Int, Paint, Paint)
} derive(Show, ToJson)

let var_idx_none : UInt