wrap all that repetition in a closure
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parent
b9c6cf1a07
commit
cbe14d53cd
58
quantizer.go
58
quantizer.go
@ -134,15 +134,7 @@ func applyError(diffusion diffusion, quantError float64, currentPixel coord, err
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}
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}
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func simpleErrorDiffusion() quantizerFunction {
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errMap := make(map[coord]float64)
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d := diffusion{
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divisor: 2.0,
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matrix: map[coord]float64{
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{x: 1, y: 0}: 1.0,
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{x: 0, y: 1}: 1.0,
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},
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}
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func diffuser(errMap map[coord]float64, d diffusion) quantizerFunction {
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return func(x int, y int, c color.Color) color.Color {
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p := coord{x: x, y: y}
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l := luminence(c) + errMap[p]
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@ -156,6 +148,18 @@ func simpleErrorDiffusion() quantizerFunction {
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}
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}
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func simpleErrorDiffusion() quantizerFunction {
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errMap := make(map[coord]float64)
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d := diffusion{
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divisor: 2.0,
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matrix: map[coord]float64{
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{x: 1, y: 0}: 1.0,
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{x: 0, y: 1}: 1.0,
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},
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}
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return diffuser(errMap, d)
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}
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func floydSteinberg() quantizerFunction {
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errMap := make(map[coord]float64)
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d := diffusion{
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@ -167,17 +171,7 @@ func floydSteinberg() quantizerFunction {
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{x: 1, y: 1}: 1.0,
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},
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}
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return func(x int, y int, c color.Color) color.Color {
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p := coord{x: x, y: y}
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l := luminence(c) + errMap[p]
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delete(errMap, p) // don't let the error map grow too big
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if l > 0.5 {
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applyError(d, l-1.0, p, errMap)
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return color.White
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}
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applyError(d, l, p, errMap)
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return color.Black
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}
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return diffuser(errMap, d)
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}
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func jarvisJudiceNinke() quantizerFunction {
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@ -201,17 +195,7 @@ func jarvisJudiceNinke() quantizerFunction {
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{x: 2, y: 2}: 1.0,
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},
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}
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return func(x int, y int, c color.Color) color.Color {
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p := coord{x: x, y: y}
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l := luminence(c) + errMap[p]
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delete(errMap, p) // don't let the error map grow too big
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if l > 0.5 {
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applyError(d, l-1.0, p, errMap)
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return color.White
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}
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applyError(d, l, p, errMap)
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return color.Black
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}
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return diffuser(errMap, d)
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}
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func atkinson() quantizerFunction {
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@ -227,17 +211,7 @@ func atkinson() quantizerFunction {
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{x: 0, y: 2}: 1.0,
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},
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}
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return func(x int, y int, c color.Color) color.Color {
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p := coord{x: x, y: y}
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l := luminence(c) + errMap[p]
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delete(errMap, p) // don't let the error map grow too big
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if l > 0.5 {
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applyError(d, l-1.0, p, errMap)
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return color.White
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}
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applyError(d, l, p, errMap)
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return color.Black
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}
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return diffuser(errMap, d)
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}
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// That is, "relative luminance": https://en.wikipedia.org/wiki/Relative_luminance.
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