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alpha for masks

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This commit is contained in:
Ryan Oldenburg 2020-11-30 21:58:19 -06:00
parent 37428fb28c
commit 18967133ff
1 changed files with 16 additions and 16 deletions
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32
src/pixie/masks.nim
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@ -25,36 +25,36 @@ proc `$`*(mask: Mask): string =
## Display the mask size and channels. ## Display the mask size and channels.
"<Mask " & $mask.width & "x" & $mask.height & ">" "<Mask " & $mask.width & "x" & $mask.height & ">"
proc getRgbaUnsafe*(mask: Mask, x, y: int): uint8 {.inline.} = proc getUnsafe*(mask: Mask, x, y: int): uint8 {.inline.} =
## Gets a alpha from (x, y) coordinates. ## Gets a value from (x, y) coordinates.
## * No bounds checking * ## * No bounds checking *
## Make sure that x, y are in bounds. ## Make sure that x, y are in bounds.
## Failure in the assumptions will case unsafe memory reads. ## Failure in the assumptions will case unsafe memory reads.
result = mask.data[mask.width * y + x] result = mask.data[mask.width * y + x]
proc `[]`*(mask: Mask, x, y: int): uint8 {.inline.} = proc `[]`*(mask: Mask, x, y: int): uint8 {.inline.} =
## Gets a pixel at (x, y) or returns transparent black if outside of bounds. ## Gets the value at (x, y) or returns transparent black if outside of bounds.
if mask.inside(x, y): if mask.inside(x, y):
return mask.getRgbaUnsafe(x, y) return mask.getUnsafe(x, y)
proc setRgbaUnsafe*(mask: Mask, x, y: int, alpha: uint8) {.inline.} = proc setUnsafe*(mask: Mask, x, y: int, value: uint8) {.inline.} =
## Sets a color from (x, y) coordinates. ## Sets the value from (x, y) coordinates.
## * No bounds checking * ## * No bounds checking *
## Make sure that x, y are in bounds. ## Make sure that x, y are in bounds.
## Failure in the assumptions will case unsafe memory writes. ## Failure in the assumptions will case unsafe memory writes.
mask.data[mask.width * y + x] = alpha mask.data[mask.width * y + x] = value
proc `[]=`*(mask: Mask, x, y: int, alpha: uint8) {.inline.} = proc `[]=`*(mask: Mask, x, y: int, value: uint8) {.inline.} =
## Sets a pixel at (x, y) or does nothing if outside of bounds. ## Sets the value at (x, y) or does nothing if outside of bounds.
if mask.inside(x, y): if mask.inside(x, y):
mask.setRgbaUnsafe(x, y, alpha) mask.setUnsafe(x, y, value)
proc fill*(mask: Mask, alpha: uint8) = proc fill*(mask: Mask, value: uint8) =
## Fills the mask with a solid color. ## Fills the mask with the paramter value.
for i in 0 ..< mask.data.len: for i in 0 ..< mask.data.len:
mask.data[i] = alpha mask.data[i] = value
proc invert*(mask: Mask) = proc invert*(mask: Mask) =
## Inverts all of the colors and alpha. ## Inverts the entire mask value.
for alpha in mask.data.mitems: for value in mask.data.mitems:
alpha = 255 - alpha value = 255 - value