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more clear docs i think + bufix

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Ryan Oldenburg 2021-01-27 16:43:33 -06:00
parent 2cd3c35fc1
commit a6103ac444
1 changed files with 16 additions and 8 deletions
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22
src/pixie/images.nim
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@ -154,15 +154,23 @@ proc minifyBy2*(image: Image): Image =
image.getRgbaUnsafe(x * 2 + 0, y * 2 + 1).color / 4.0
result.setRgbaUnsafe(x, y, color.rgba)
proc minifyBy2*(image: Image, scale2x: int): Image =
proc minifyBy2*(image: Image, power: int): Image =
## Scales the image down by an integer scale.
result = image
for i in 1 ..< scale2x:
if power < 0:
raise newException(PixieError, "Cannot minifyBy2 with negative power")
if power == 0:
result = image.copy()
else:
for i in 1 .. power:
result = result.minifyBy2()
proc magnifyBy2*(image: Image, scale2x: int): Image =
## Scales image image up by an integer scale.
let scale = 2 ^ scale2x
proc magnifyBy2*(image: Image, power: int): Image =
## Scales image image up by 2 ^ power.
if power < 0:
raise newException(PixieError, "Cannot magnifyBy2 with negative power")
let scale = 2 ^ power
result = newImage(image.width * scale, image.height * scale)
for y in 0 ..< result.height:
for x in 0 ..< result.width:
@ -170,7 +178,7 @@ proc magnifyBy2*(image: Image, scale2x: int): Image =
result.setRgbaUnsafe(x, y, rgba)
proc magnifyBy2*(image: Image): Image =
image.magnifyBy2(2)
image.magnifyBy2(1)
proc toPremultipliedAlpha*(image: Image) =
## Converts an image to premultiplied alpha from straight alpha.