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repeat into proc

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Ryan Oldenburg 2021-01-27 03:15:43 -06:00
parent c4abba5d8a
commit eb360887ab
1 changed files with 16 additions and 24 deletions
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40
src/pixie/images.nim
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@ -263,24 +263,27 @@ proc getRgbaSmooth*(image: Image, x, y: float32): ColorRGBA {.inline.} =
finalMix.toStraightAlpha() finalMix.toStraightAlpha()
proc gaussianLookup(radius: int): seq[float32] =
## Compute lookup table for 1d Gaussian kernel.
result.setLen(radius * 2 + 1)
var total = 0.0
for xb in -radius .. radius:
let
s = radius.float32 / 2.2 # 2.2 matches Figma.
x = xb.float32
a = 1 / sqrt(2 * PI * s^2) * exp(-1 * x^2 / (2 * s^2))
result[xb + radius] = a
total += a
for xb in -radius .. radius:
result[xb + radius] = result[xb + radius] / total
proc blur*(image: Image, radius: float32) = proc blur*(image: Image, radius: float32) =
## Applies Gaussian blur to the image given a radius. ## Applies Gaussian blur to the image given a radius.
let radius = round(radius).int let radius = round(radius).int
if radius == 0: if radius == 0:
return return
# Compute lookup table for 1d Gaussian kernel. let lookup = gaussianLookup(radius)
var
lookup = newSeq[float](radius * 2 + 1)
total = 0.0
for xb in -radius .. radius:
let s = radius.float32 / 2.2 # 2.2 matches Figma.
let x = xb.float32
let a = 1 / sqrt(2 * PI * s^2) * exp(-1 * x^2 / (2 * s^2))
lookup[xb + radius] = a
total += a
for xb in -radius .. radius:
lookup[xb + radius] /= total
# Blur in the X direction. # Blur in the X direction.
var blurX = newImage(image.width, image.height) var blurX = newImage(image.width, image.height)
@ -327,18 +330,7 @@ proc blurAlpha*(image: Image, radius: float32) =
if radius == 0: if radius == 0:
return return
# Compute lookup table for 1d Gaussian kernel. let lookup = gaussianLookup(radius)
var
lookup = newSeq[float](radius * 2 + 1)
total = 0.0
for xb in -radius .. radius:
let s = radius.float32 / 2.2 # 2.2 matches Figma.
let x = xb.float32
let a = 1 / sqrt(2 * PI * s^2) * exp(-1 * x^2 / (2 * s^2))
lookup[xb + radius] = a
total += a
for xb in -radius .. radius:
lookup[xb + radius] /= total
# Blur in the X direction. # Blur in the X direction.
var blurX = newImage(image.width, image.height) var blurX = newImage(image.width, image.height)