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This commit is contained in:
Ryan Oldenburg 2022-07-26 23:35:19 -05:00
parent 2f746876b6
commit 518eb1fb81
1 changed files with 14 additions and 12 deletions
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26
src/pixie/images.nim
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@ -77,23 +77,25 @@ proc isOpaque*(image: Image): bool {.raises: [].} =
proc flipHorizontal*(image: Image) {.raises: [].} = proc flipHorizontal*(image: Image) {.raises: [].} =
## Flips the image around the Y axis. ## Flips the image around the Y axis.
let w = image.width div 2 let halfWidth = image.width div 2
for y in 0 ..< image.height: for y in 0 ..< image.height:
for x in 0 ..< w: var
swap( left = image.dataIndex(0, y)
image.data[image.dataIndex(x, y)], right = left + image.width - 1
image.data[image.dataIndex(image.width - x - 1, y)] for x in 0 ..< halfWidth:
) swap(image.data[left], image.data[right])
inc left
dec right
proc flipVertical*(image: Image) {.raises: [].} = proc flipVertical*(image: Image) {.raises: [].} =
## Flips the image around the X axis. ## Flips the image around the X axis.
let h = image.height div 2 let halfHeight = image.height div 2
for y in 0 ..< h: for y in 0 ..< halfHeight:
let
topStart = image.dataIndex(0, y)
bottomStart = image.dataIndex(0, image.height - y - 1)
for x in 0 ..< image.width: for x in 0 ..< image.width:
swap( swap(image.data[topStart + x], image.data[bottomStart + x])
image.data[image.dataIndex(x, y)],
image.data[image.dataIndex(x, image.height - y - 1)]
)
proc rotate90*(image: Image) {.raises: [PixieError].} = proc rotate90*(image: Image) {.raises: [PixieError].} =
## Rotates the image 90 degrees clockwise. ## Rotates the image 90 degrees clockwise.