blob: 142d21d68b66236919890b664a637a34c16554f0 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
class PSDCurves
constructor: (@layer, @length) ->
@file = @layer.file
@data =
curve: []
parse: ->
start = @file.tell()
# Data padding. Docs are wrong. Maybe Photoshop is wrong.
# I don't know what's right anymore.
@file.seek 1
version = @file.readShortInt()
assert version in [1, 4]
tag = @file.readInt()
@data.curveCount = 0
for i in [0...32]
# Count of the curves in the file
@data.curveCount++ if tag & (1 << i)
for i in [0...@data.curveCount]
count = 0
for j in [0...32]
if tag & (1 << j)
if count is i
@data.curve[i] = channelIndex: j
break
count++
@data.curve[i].pointCount = @file.getShortInt()
assert @data.curve[i].pointCount >= 2
assert @data.curve[i].pointCount <= 19
for j in [0...@data.curve[i].pointCount]
# Curve points. Each point is a pair of short ints where the
# first number is the output value and the second is the input.
@data.curve[i].outputValue[j] = @file.readShortInt()
@data.curve[i].inputValue[j] = @file.readShortInt()
assert @data.curve[i].outputValue[j] >= 0
assert @data.curve[i].outputValue[j] <= 255
assert @data.curve[i].inputValue[j] >= 0
assert @data.curve[i].inputValue[j] <= 255
# If this is true, we have some additional information to parse.
if @file.tell() - start < @length - 4
tag = @file.readString 4
assert.equal tag, 'Crv '
version = @file.readShortInt()
assert version is 4
curveCount = @file.readInt()
assert.equal curveCount, @data.curveCount
for i in [0...@data.curveCount]
@data.curve[i].channelIndex = @file.readShortInt()
pointCount = @file.readShortInt()
assert pointCount is @data.curve[i].pointCount
for j in [0...pointCount]
outputValue = @file.getShortInt()
inputValue = @file.getShortInt()
assert.equal outputValue, @data.curve[i].outputValue[j]
assert.equal inputValue, @data.curve[i].inputValue[j]
# Only returned the parsed data
@data
|
