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in place sharp and apply opacity

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This commit is contained in:
Ryan Oldenburg 2020-12-03 14:36:54 -06:00
parent b3b844ea0e
commit a69a4327a0
2 changed files with 4 additions and 6 deletions
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6
src/pixie/images.nim
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@ -347,19 +347,17 @@ proc shadow*(
result.fill(color) result.fill(color)
result.draw(shadow, blendMode = bmMask) result.draw(shadow, blendMode = bmMask)
proc applyOpacity*(image: Image, opacity: float32): Image = proc applyOpacity*(image: Image, opacity: float32) =
## Multiplies alpha of the image by opacity. ## Multiplies alpha of the image by opacity.
result = newImage(image.width, image.height)
let op = (255 * opacity).uint32 let op = (255 * opacity).uint32
for i in 0 ..< image.data.len: for i in 0 ..< image.data.len:
var rgba = image.data[i] var rgba = image.data[i]
rgba.a = ((rgba.a.uint32 * op) div 255).clamp(0, 255).uint8 rgba.a = ((rgba.a.uint32 * op) div 255).clamp(0, 255).uint8
image.data[i] = rgba image.data[i] = rgba
proc sharpOpacity*(image: Image): Image = proc sharpOpacity*(image: Image) =
## Sharpens the opacity to extreme. ## Sharpens the opacity to extreme.
## A = 0 stays 0. Anything else turns into 255. ## A = 0 stays 0. Anything else turns into 255.
result = newImage(image.width, image.height)
for i in 0 ..< image.data.len: for i in 0 ..< image.data.len:
var rgba = image.data[i] var rgba = image.data[i]
if rgba.a == 0: if rgba.a == 0:

4
tests/benchmark_images.nim
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@ -66,7 +66,7 @@ timeIt "applyOpacityOriginal":
timeIt "applyOpacity": timeIt "applyOpacity":
var a = newImage(2560, 1440) var a = newImage(2560, 1440)
for i in 0 ..< iterations: for i in 0 ..< iterations:
a = a.applyOpacity(0.5) a.applyOpacity(0.5)
timeIt "sharpOpacityOriginal": timeIt "sharpOpacityOriginal":
var a = newImage(2560, 1440) var a = newImage(2560, 1440)
@ -76,4 +76,4 @@ timeIt "sharpOpacityOriginal":
timeIt "sharpOpacity": timeIt "sharpOpacity":
var a = newImage(2560, 1440) var a = newImage(2560, 1440)
for i in 0 ..< iterations: for i in 0 ..< iterations:
a = a.sharpOpacity() a.sharpOpacity()