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Ryan Oldenburg
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d0294ebec7
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1 changed files with 101 additions and 101 deletions
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@ -369,6 +369,107 @@ proc invert*(target: Image | Mask) =
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for j in i ..< target.data.len:
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target.data[j] = (255 - target.data[j]).uint8
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proc blur*(target: Image | Mask, radius: float32) =
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## Applies Gaussian blur to the image given a radius.
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let radius = round(radius).int
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if radius == 0:
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return
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proc gaussianLookup(radius: int): seq[uint32] =
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## Compute lookup table for 1d Gaussian kernel.
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## Values are [0, 255] * 1024.
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result.setLen(radius * 2 + 1)
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var
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floats = newSeq[float32](result.len)
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total = 0.0
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for xb in -radius .. radius:
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let
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s = radius.float32 / 2.2 # 2.2 matches Figma.
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x = xb.float32
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a = 1 / sqrt(2 * PI * s^2) * exp(-1 * x^2 / (2 * s^2))
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floats[xb + radius] = a
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total += a
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for xb in -radius .. radius:
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floats[xb + radius] = floats[xb + radius] / total
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for i, f in floats:
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result[i] = round(f * 255 * 1024).uint32
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let lookup = gaussianLookup(radius)
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when type(target) is Image:
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template `*`(sample: ColorRGBA, a: uint32): array[4, uint32] =
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[
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sample.r * a,
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sample.g * a,
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sample.b * a,
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sample.a * a
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]
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template `+=`(values: var array[4, uint32], sample: array[4, uint32]) =
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values[0] += sample[0]
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values[1] += sample[1]
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values[2] += sample[2]
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values[3] += sample[3]
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template rgba(values: array[4, uint32]): ColorRGBA =
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rgba(
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(values[0] div 1024 div 255).uint8,
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(values[1] div 1024 div 255).uint8,
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(values[2] div 1024 div 255).uint8,
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(values[3] div 1024 div 255).uint8
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)
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# Blur in the X direction.
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var blurX = newImage(target.width, target.height)
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for y in 0 ..< target.height:
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for x in 0 ..< target.width:
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var values: array[4, uint32]
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for xb in -radius .. radius:
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let
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sample = target[x + xb, y]
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a = lookup[xb + radius].uint32
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values += sample * a
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blurX.setRgbaUnsafe(x, y, values.rgba())
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# Blur in the Y direction.
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for y in 0 ..< target.height:
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for x in 0 ..< target.width:
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var values: array[4, uint32]
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for yb in -radius .. radius:
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let
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sample = blurX[x, y + yb]
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a = lookup[yb + radius].uint32
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values += sample * a
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target.setRgbaUnsafe(x, y, values.rgba())
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else: # target is a Mask
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# Blur in the X direction.
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var blurX = newMask(target.width, target.height)
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for y in 0 ..< target.height:
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for x in 0 ..< target.width:
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var value: uint32
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for xb in -radius .. radius:
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let
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sample = target[x + xb, y]
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a = lookup[xb + radius].uint32
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value += sample * a
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blurX.setValueUnsafe(x, y, (value div 1024 div 255).uint8)
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# Blur in the Y direction and modify image.
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for y in 0 ..< target.height:
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for x in 0 ..< target.width:
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var value: uint32
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for yb in -radius .. radius:
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let
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sample = blurX[x, y + yb]
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a = lookup[yb + radius].uint32
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value += sample * a
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target.setValueUnsafe(x, y, (value div 1024 div 255).uint8)
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proc newMask*(image: Image): Mask =
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## Returns a new mask using the alpha values of the parameter image.
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result = newMask(image.width, image.height)
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@ -508,107 +609,6 @@ proc draw*(
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) {.inline.} =
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mask.draw(image, translate(pos), blendMode)
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proc blur*(target: Image | Mask, radius: float32) =
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## Applies Gaussian blur to the image given a radius.
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let radius = round(radius).int
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if radius == 0:
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return
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proc gaussianLookup(radius: int): seq[uint32] =
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## Compute lookup table for 1d Gaussian kernel.
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## Values are [0, 255] * 1024.
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result.setLen(radius * 2 + 1)
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var
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floats = newSeq[float32](result.len)
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total = 0.0
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for xb in -radius .. radius:
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let
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s = radius.float32 / 2.2 # 2.2 matches Figma.
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x = xb.float32
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a = 1 / sqrt(2 * PI * s^2) * exp(-1 * x^2 / (2 * s^2))
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floats[xb + radius] = a
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total += a
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for xb in -radius .. radius:
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floats[xb + radius] = floats[xb + radius] / total
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for i, f in floats:
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result[i] = round(f * 255 * 1024).uint32
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let lookup = gaussianLookup(radius)
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when type(target) is Image:
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template `*`(sample: ColorRGBA, a: uint32): array[4, uint32] =
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[
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sample.r * a,
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sample.g * a,
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sample.b * a,
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sample.a * a
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]
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template `+=`(values: var array[4, uint32], sample: array[4, uint32]) =
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values[0] += sample[0]
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values[1] += sample[1]
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values[2] += sample[2]
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values[3] += sample[3]
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template rgba(values: array[4, uint32]): ColorRGBA =
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rgba(
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(values[0] div 1024 div 255).uint8,
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(values[1] div 1024 div 255).uint8,
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(values[2] div 1024 div 255).uint8,
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(values[3] div 1024 div 255).uint8
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)
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# Blur in the X direction.
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var blurX = newImage(target.width, target.height)
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for y in 0 ..< target.height:
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for x in 0 ..< target.width:
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var values: array[4, uint32]
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for xb in -radius .. radius:
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let
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sample = target[x + xb, y]
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a = lookup[xb + radius].uint32
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values += sample * a
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blurX.setRgbaUnsafe(x, y, values.rgba())
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# Blur in the Y direction.
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for y in 0 ..< target.height:
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for x in 0 ..< target.width:
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var values: array[4, uint32]
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for yb in -radius .. radius:
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let
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sample = blurX[x, y + yb]
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a = lookup[yb + radius].uint32
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values += sample * a
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target.setRgbaUnsafe(x, y, values.rgba())
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else: # target is a Mask
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# Blur in the X direction.
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var blurX = newMask(target.width, target.height)
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for y in 0 ..< target.height:
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for x in 0 ..< target.width:
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var value: uint32
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for xb in -radius .. radius:
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let
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sample = target[x + xb, y]
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a = lookup[xb + radius].uint32
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value += sample * a
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blurX.setValueUnsafe(x, y, (value div 1024 div 255).uint8)
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# Blur in the Y direction and modify image.
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for y in 0 ..< target.height:
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for x in 0 ..< target.width:
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var value: uint32
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for yb in -radius .. radius:
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let
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sample = blurX[x, y + yb]
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a = lookup[yb + radius].uint32
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value += sample * a
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target.setValueUnsafe(x, y, (value div 1024 div 255).uint8)
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proc drawUber(
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a, b: Image,
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p, dx, dy: Vec2,
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