Remove table use.
This commit is contained in:
treeform
parent
2e4efefabb
commit
fdd6f51dde
1 changed files with 22 additions and 36 deletions
|
|
@ -1,4 +1,4 @@
|
|||
import pixie/common, pixie/images, strutils, tables
|
||||
import pixie/common, pixie/images, sequtils, strutils
|
||||
|
||||
# This JPEG decoder is loosely based on stb_image which is public domain.
|
||||
|
||||
|
|
@ -69,6 +69,7 @@ type
|
|||
dcPred: int
|
||||
widthCoeff, heightCoeff: int
|
||||
data, coeff, lineBuf: seq[uint8]
|
||||
blocks: seq[seq[array[64, int16]]]
|
||||
|
||||
DecoderState = object
|
||||
buffer: seq[uint8]
|
||||
|
|
@ -86,8 +87,6 @@ type
|
|||
mcuWidth, mcuHeight, numMcuWide, numMcuHigh: int
|
||||
componentOrder: seq[int]
|
||||
progressive: bool
|
||||
decodedBlocks: Table[(int, int, int), array[64, int16]]
|
||||
|
||||
restartInterval: int
|
||||
todo: int
|
||||
eobRun: int
|
||||
|
|
@ -287,6 +286,14 @@ proc decodeSOF0(state: var DecoderState) =
|
|||
state.maxXScale - 1
|
||||
) div state.maxXScale
|
||||
|
||||
# Allocate block data structures.
|
||||
state.components[i].blocks = newSeqWith(
|
||||
state.components[i].width,
|
||||
newSeq[array[64, int16]](
|
||||
state.components[i].height
|
||||
)
|
||||
)
|
||||
|
||||
state.components[i].widthStride =
|
||||
state.numMcuWide * state.components[i].yScale * 8
|
||||
state.components[i].heightStride =
|
||||
|
|
@ -766,12 +773,7 @@ proc idctBlock(component: var Component, offset: int, data: array[64, int16]) =
|
|||
|
||||
proc decodeBlock(state: var DecoderState, comp, row, column: int) =
|
||||
## Decodes a block.
|
||||
var data: array[64, int16]
|
||||
if (comp, row, column) in state.decodedBlocks:
|
||||
try:
|
||||
data = state.decodedBlocks[(comp, row, column)]
|
||||
except:
|
||||
failInvalid()
|
||||
var data = state.components[comp].blocks[row][column]
|
||||
if state.progressive:
|
||||
if state.spectralStart == 0:
|
||||
state.decodeProgressiveBlock(comp, data)
|
||||
|
|
@ -779,10 +781,7 @@ proc decodeBlock(state: var DecoderState, comp, row, column: int) =
|
|||
state.decodeProgressiveContinuationBlock(comp, data)
|
||||
else:
|
||||
state.decodeRegularBlock(comp, data)
|
||||
try:
|
||||
state.decodedBlocks[(comp, row, column)] = data
|
||||
except:
|
||||
failInvalid()
|
||||
state.components[comp].blocks[row][column] = data
|
||||
|
||||
template checkReset(state: var DecoderState) =
|
||||
dec state.todo
|
||||
|
|
@ -807,11 +806,8 @@ proc decodeBlocks(state: var DecoderState) =
|
|||
comp = state.componentOrder[0]
|
||||
w = (state.components[comp].width + 7) shr 3
|
||||
h = (state.components[comp].height + 7) shr 3
|
||||
for j in 0 ..< h:
|
||||
for i in 0 ..< w:
|
||||
let
|
||||
row = i * 8
|
||||
column = j * 8
|
||||
for column in 0 ..< h:
|
||||
for row in 0 ..< w:
|
||||
state.decodeBlock(comp, row, column)
|
||||
state.checkReset()
|
||||
else:
|
||||
|
|
@ -822,8 +818,8 @@ proc decodeBlocks(state: var DecoderState) =
|
|||
for j in 0 ..< state.components[comp].yScale:
|
||||
for i in 0 ..< state.components[comp].xScale:
|
||||
let
|
||||
row = (x * state.components[comp].xScale + i) * 8
|
||||
column = (y * state.components[comp].yScale + j) * 8
|
||||
row = (x * state.components[comp].xScale + i)
|
||||
column = (y * state.components[comp].yScale + j)
|
||||
state.decodeBlock(comp, row, column)
|
||||
state.checkReset()
|
||||
else:
|
||||
|
|
@ -834,8 +830,8 @@ proc decodeBlocks(state: var DecoderState) =
|
|||
for j in 0 ..< state.components[comp].xScale:
|
||||
for i in 0 ..< state.components[comp].yScale:
|
||||
let
|
||||
row = (x * state.components[comp].yScale + i) * 8
|
||||
column = (y * state.components[comp].xScale + j) * 8
|
||||
row = (x * state.components[comp].yScale + i)
|
||||
column = (y * state.components[comp].xScale + j)
|
||||
state.decodeBlock(comp, row, column)
|
||||
state.checkReset()
|
||||
|
||||
|
|
@ -846,19 +842,9 @@ proc quantizationAndIDCTPass(state: var DecoderState) =
|
|||
w = (state.components[comp].width + 7) shr 3
|
||||
h = (state.components[comp].height + 7) shr 3
|
||||
|
||||
for j in 0 ..< h:
|
||||
for i in 0 ..< w:
|
||||
let
|
||||
row = i * 8
|
||||
column = j * 8
|
||||
|
||||
var data: array[64, int16]
|
||||
|
||||
if (comp, row, column) in state.decodedBlocks:
|
||||
try:
|
||||
data = state.decodedBlocks[(comp, row, column)]
|
||||
except:
|
||||
failInvalid()
|
||||
for column in 0 ..< h:
|
||||
for row in 0 ..< w:
|
||||
var data = state.components[comp].blocks[row][column]
|
||||
|
||||
for i in 0 ..< 64:
|
||||
let qTableId = state.components[comp].quantizationTableId
|
||||
|
|
@ -867,7 +853,7 @@ proc quantizationAndIDCTPass(state: var DecoderState) =
|
|||
data[i] = clampInt16(data[i] * state.quantizationTables[qTableId][i].int)
|
||||
|
||||
state.components[comp].idctBlock(
|
||||
state.components[comp].widthStride * column + row,
|
||||
state.components[comp].widthStride * column * 8 + row * 8,
|
||||
data
|
||||
)
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue