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This commit is contained in:
Ryan Oldenburg 2022-05-25 19:41:33 -05:00
parent 403a2b95a8
commit 75f630f824
1 changed files with 7 additions and 5 deletions
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12
src/pixie/fileformats/jpeg.nim
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@ -955,7 +955,10 @@ proc grayScaleToRgbx(gray: uint8): ColorRGBX {.inline.} =
proc buildImage(state: var DecoderState): Image = proc buildImage(state: var DecoderState): Image =
## Takes a jpeg image object and builds a pixie Image from it. ## Takes a jpeg image object and builds a pixie Image from it.
if state.components.len == 3: result = newImage(state.imageWidth, state.imageHeight)
case state.components.len:
of 3:
for component in state.components.mitems: for component in state.components.mitems:
while component.yScale < state.maxYScale: while component.yScale < state.maxYScale:
component.channel = component.channel.magnifyXBy2() component.channel = component.channel.magnifyXBy2()
@ -965,9 +968,6 @@ proc buildImage(state: var DecoderState): Image =
component.channel = component.channel.magnifyYBy2() component.channel = component.channel.magnifyYBy2()
component.xScale *= 2 component.xScale *= 2
result = newImage(state.imageWidth, state.imageHeight)
if state.components.len == 3:
let let
cy = state.components[0].channel cy = state.components[0].channel
cb = state.components[1].channel cb = state.components[1].channel
@ -981,13 +981,15 @@ proc buildImage(state: var DecoderState): Image =
cr.data[channelIndex], cr.data[channelIndex],
) )
inc channelIndex inc channelIndex
elif state.components.len == 1:
of 1:
let cy = state.components[0].channel let cy = state.components[0].channel
for y in 0 ..< state.imageHeight: for y in 0 ..< state.imageHeight:
var channelIndex = cy.dataIndex(0, y) var channelIndex = cy.dataIndex(0, y)
for x in 0 ..< state.imageWidth: for x in 0 ..< state.imageWidth:
result.unsafe[x, y] = grayScaleToRgbx(cy.data[channelIndex]) result.unsafe[x, y] = grayScaleToRgbx(cy.data[channelIndex])
inc channelIndex inc channelIndex
else: else:
failInvalid() failInvalid()