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# libpsd has effect layer parsing
# see https://github.com/alco/psdump/blob/master/libpsd-0.9
class PSDEffectsInfo
constructor: (@layer, @length) ->
@file = @layer.file
parse: ->
effectsVersion = @file.readInt()
assert effectsVersion is 0
version = @file.readInt()
assert version is 16
(new PSDEffectsDescriptor(@file)).parse()
parseLegacy: ->
effects = []
[
v, # always 0
count
] = @file.readf ">HH"
while count-- > 0
[
signature,
type
] = @file.readf ">4s4s"
[size] = @file.readf ">i"
pos = @file.tell()
Log.debug("Parsing effect layer with type #{type} and size #{size}")
effect =
switch type
when "cmnS" then new PSDLayerEffectCommonStateInfo @file
when "dsdw" then new PSDDropDownLayerEffect @file
when "isdw" then new PSDDropDownLayerEffect @file, true # inner drop shadow
data = effect?.parse()
left = (pos + size) - @file.tell()
if left != 0
Log.debug("Failed to parse effect layer with type #{type}")
@file.seek left
else
effects.push(data) unless type == "cmnS" # ignore commons state info
legacy: true
effects: effects
# This is ridiculous. The effects layer does not follow the standard
# descriptor structure. Have to do a little hacking here.
class PSDEffectsDescriptor extends PSDDescriptor
parseItem: (id) ->
type = @file.readString(4)
data = switch id
when "patternFill" then @parseLayerPatternOverlay()
else super(id, type)
data
class PSDLayerEffect
constructor: (@file) ->
parse: ->
# these are common to all effects
[@version] = @file.readf ">i"
getSpaceColor: ->
@file.read(2) # 2 bytes for space
@file.readf ">HHHH" # 4 * 2 byte color component - r, g, b, a
class PSDLayerEffectCommonStateInfo extends PSDLayerEffect
parse: ->
super()
# always true
@visible = @file.readBoolean()
# unused
@file.read(2)
{visible: @visible}
# Based on https://github.com/alco/psdump/blob/master/libpsd-0.9/src/drop_shadow.c
class PSDDropDownLayerEffect extends PSDLayerEffect
constructor: (file, @inner = false) ->
super(file)
#defaults
@blendMode = "mul"
@color = @nativeColor = [0,0,0,0]
@opacity = 191
@angle = 120
@useGlobalLight = true
@distance = 5
# v2
@spread = 0
@size = 5
@antiAliased = false
@knocksOut = false
parse: ->
super()
[
@blur, # This seems to be wrong in the specification! - see libpsd
@intensity,
@angle,
@distance
] = @file.readf ">hiii"
@file.read(2) # extra 2 bytes for space. The spec doesn't mention this!
@color = @getSpaceColor()
[
@signature,
@blendMode
] = @file.readf ">4s4s"
@enabled = @file.readBoolean()
@useAngleInAllFX = @file.readBoolean()
[@opacity] = @file.read(1)
@nativeColor = @getSpaceColor() if @version == 2
data = {}
for own key, val of @
continue if key is "file"
data[key] = val
data
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