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Add sharpOpacity.

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treeform 2020-11-23 17:11:47 -08:00
parent 3b68dd77bb
commit 549f2e17b0
1 changed files with 12 additions and 0 deletions
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12
src/pixie/images.nim
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@ -404,3 +404,15 @@ proc applyOpacity*(image: Image, opacity: float32): Image =
var rgba = image.getRgbaUnsafe(x, y) var rgba = image.getRgbaUnsafe(x, y)
rgba.a = ((rgba.a.uint32 * op.uint32) div 255).clamp(0, 255).uint8 rgba.a = ((rgba.a.uint32 * op.uint32) div 255).clamp(0, 255).uint8
result.setRgbaUnsafe(x, y, rgba) result.setRgbaUnsafe(x, y, rgba)
proc sharpOpacity*(image: Image): Image =
## Sharpens the opacity to extreme.
## A = 0 stays 0. Anything else turns into 255.
result = newImageNoInit(image.width, image.height)
for y in 0 ..< image.height:
for x in 0 ..< image.width:
var rgba = image.getRgbaUnsafe(x, y)
if rgba.a == 0:
result.setRgbaUnsafe(x, y, rgba(0, 0, 0, 0))
else:
result.setRgbaUnsafe(x, y, rgba(255, 255, 255, 255))