84 lines
2.2 KiB
Nim
84 lines
2.2 KiB
Nim
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import benchy, pixie, pixie/internal
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proc blurSlower*(
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image: Image, radius: float32, outOfBounds: SomeColor = ColorRGBX()
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) =
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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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let
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kernel = gaussianKernel(radius)
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outOfBounds = outOfBounds.asRgbx()
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proc `*`(sample: ColorRGBX, a: uint32): array[4, uint32] {.inline.} =
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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 rgbx(values: array[4, uint32]): ColorRGBX =
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rgbx(
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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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let blurX = newImage(image.width, image.height)
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for y in 0 ..< image.height:
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for x in 0 ..< image.width:
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var values: array[4, uint32]
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for xx in x - radius ..< min(x + radius, 0):
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values += outOfBounds * kernel[xx - x + radius]
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for xx in max(x - radius, 0) .. min(x + radius, image.width - 1):
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values += image.getRgbaUnsafe(xx, y) * kernel[xx - x + radius]
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for xx in max(x - radius, image.width) .. x + radius:
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values += outOfBounds * kernel[xx - x + radius]
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blurX.setRgbaUnsafe(x, y, rgbx(values))
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# Blur in the Y direction.
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for y in 0 ..< image.height:
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for x in 0 ..< image.width:
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var values: array[4, uint32]
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for yy in y - radius ..< min(y + radius, 0):
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values += outOfBounds * kernel[yy - y + radius]
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for yy in max(y - radius, 0) .. min(y + radius, image.height - 1):
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values += blurX.getRgbaUnsafe(x, yy) * kernel[yy - y + radius]
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for yy in max(y - radius, image.height) .. y + radius:
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values += outOfBounds * kernel[yy - y + radius]
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image.setRgbaUnsafe(x, y, rgbx(values))
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let image = newImage(1920, 1080)
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proc reset() =
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var path: Path
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path.rect(100, 100, 1720, 880)
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image.fillPath(path, rgba(255, 255, 255, 255))
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reset()
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timeIt "blurSlower":
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image.blurSlower(40)
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reset()
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timeIt "blur":
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image.blur(40)
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