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ez perf

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This commit is contained in:
Ryan Oldenburg 2022-05-16 22:29:56 -05:00
parent 3f2fefb43d
commit 3e204e829f
1 changed files with 8 additions and 4 deletions
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12
src/pixie/fileformats/jpeg.nim
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@ -895,17 +895,21 @@ proc buildImage(state: var DecoderState): Image =
cb = state.components[1].channel
cr = state.components[2].channel
for y in 0 ..< state.imageHeight:
var channelIndex = cy.dataIndex(0, y)
for x in 0 ..< state.imageWidth:
result.unsafe[x, y] = yCbCrToRgbx(
cy.unsafe[x, y],
cb.unsafe[x, y],
cr.unsafe[x, y],
cy.data[channelIndex],
cb.data[channelIndex],
cr.data[channelIndex],
)
inc channelIndex
elif state.components.len == 1:
let cy = state.components[0].channel
for y in 0 ..< state.imageHeight:
var channelIndex = cy.dataIndex(0, y)
for x in 0 ..< state.imageWidth:
result.unsafe[x, y] = grayScaleToRgbx(cy.unsafe[x, y])
result.unsafe[x, y] = grayScaleToRgbx(cy.data[channelIndex])
inc channelIndex
else:
failInvalid()