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4x faster magnifyBy2

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This commit is contained in:
Ryan Oldenburg 2021-06-17 17:46:09 -05:00
parent e4172aefee
commit 5a3e2b8ad7
1 changed files with 7 additions and 3 deletions
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10
src/pixie/images.nim
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@ -239,9 +239,13 @@ proc magnifyBy2*(image: Image, power = 1): Image =
let scale = 2 ^ power
result = newImage(image.width * scale, image.height * scale)
for y in 0 ..< result.height:
for x in 0 ..< result.width:
var rgba = image.getRgbaUnsafe(x div scale, y div scale)
result.setRgbaUnsafe(x, y, rgba)
for x in 0 ..< image.width:
let
rgba = image.getRgbaUnsafe(x, y div scale)
scaledX = x * scale
idx = result.dataIndex(scaledX, y)
for i in 0 ..< scale:
result.data[idx + i] = rgba
proc applyOpacity*(target: Image | Mask, opacity: float32) =
## Multiplies alpha of the image by opacity.