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This commit is contained in:
Ryan Oldenburg 2022-05-16 18:41:49 -05:00
parent 8036516c7d
commit e4e94b84f9
1 changed files with 5 additions and 8 deletions

13
src/pixie/fileformats/jpeg.nim
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@ -801,16 +801,14 @@ proc quantizationAndIDCTPass(state: var DecoderState) =
let let
w = (state.components[comp].width + 7) shr 3 w = (state.components[comp].width + 7) shr 3
h = (state.components[comp].height + 7) shr 3 h = (state.components[comp].height + 7) shr 3
qTableId = state.components[comp].quantizationTableId
if qTableId.int notin 0 ..< state.quantizationTables.len:
failInvalid()
for column in 0 ..< h: for column in 0 ..< h:
for row in 0 ..< w: for row in 0 ..< w:
var data = state.components[comp].blocks[row][column] var data {.byaddr.} = state.components[comp].blocks[row][column]
for i in 0 ..< 64: for i in 0 ..< 64:
let qTableId = state.components[comp].quantizationTableId
if qTableId.int notin 0 ..< state.quantizationTables.len:
failInvalid()
data[i] = cast[int16](data[i] * state.quantizationTables[qTableId][i].int32) data[i] = cast[int16](data[i] * state.quantizationTables[qTableId][i].int32)
state.components[comp].idctBlock( state.components[comp].idctBlock(
state.components[comp].widthStride * column * 8 + row * 8, state.components[comp].widthStride * column * 8 + row * 8,
data data
@ -900,8 +898,7 @@ proc buildImage(state: var DecoderState): Image =
cr.unsafe[x, y], cr.unsafe[x, y],
) )
elif state.components.len == 1: elif state.components.len == 1:
let let cy = state.components[0].channel
cy = state.components[0].channel
for y in 0 ..< state.imageHeight: for y in 0 ..< state.imageHeight:
for x in 0 ..< state.imageWidth: for x in 0 ..< state.imageWidth:
result.unsafe[x, y] = grayScaleToRgbx(cy.unsafe[x, y]) result.unsafe[x, y] = grayScaleToRgbx(cy.unsafe[x, y])