Merge branch 'channel_images'

LICENSE.txt

+The MIT License (MIT)
+
+Copyright (c) 2014 Ryan LeFevre
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

examples/node/export_layers.js

+var PSD = require('../../');
+
+var file = process.argv[2] || './examples/images/example.psd';
+var start = new Date();
+
+PSD.open(file).then(function (psd) {
+  psd.tree().descendants().forEach(function (node) {
+    if (node.isGroup()) return true;
+    node.saveAsPng("./output/" + node.name + ".png").catch(function (err) {
+      console.log(err.stack);
+    });
+  });
+}).then(function () {
+  console.log("Finished in " + ((new Date()) - start) + "ms");
+}).catch(function (err) {
+  console.log(err.stack);
+});

lib/psd/channel_image.coffee

+_           = require 'lodash'
+Image       = require './image.coffee'
+ImageFormat = require './image_format.coffee'
+
+module.exports = class ChannelImage extends Image
+  @includes ImageFormat.LayerRAW
+  @includes ImageFormat.LayerRLE
+
+  constructor: (file, header, @layer) ->
+    @_width = @layer.width
+    @_height = @layer.height
+
+    super(file, header)
+
+    @channelsInfo = @layer.channelsInfo
+    @hasMask = _.any @channelsInfo, (c) -> c.id < -1
+    @opacity = @layer.opacity / 255.0
+    @maskData = []
+
+  skip: ->
+    for chan in @channelsInfo
+      @file.seek chan.length, true
+
+  width: -> @_width
+  height: -> @_height
+  channels: -> @layer.channels
+
+  parse: ->
+    @chanPos = 0
+    for chan in @channelsInfo
+      if chan.length <= 0
+        @parseCompression()
+        continue
+
+      @chan = chan
+
+      if chan.id < -1
+        @_width = @layer.mask.width
+        @_height = @layer.mask.height
+      else
+        @_width = @layer.width
+        @_height = @layer.height
+
+      @length = @_width * @_height
+      start = @file.tell()
+
+      @parseImageData()
+
+      finish = @file.tell()
+
+      if finish isnt start + @chan.length
+        @file.seek(start + @chan.length)
+
+    @_width = @layer.width
+    @_height = @layer.height
+
+    @processImageData()
+
+  parseImageData: ->
+    @compression = @parseCompression()
+
+    switch @compression
+      when 0 then @parseRaw()
+      when 1 then @parseRLE()
+      when 2, 3 then @parseZip()
+      else @file.seek(@endPos)

lib/psd/image.coffee

@@ -77,4 +77,4 @@ module.exports = class Image extends Module
       when 3 then @combineRgbChannel()
       when 4 then @combineCmykChannel()
 
-    @channelData = null
\ No newline at end of file
+    @channelData = null

lib/psd/image_format.coffee

 module.exports =
   RAW: require('./image_formats/raw.coffee')
-  RLE: require('./image_formats/rle.coffee')
\ No newline at end of file
+  RLE: require('./image_formats/rle.coffee')
+  LayerRLE: require('./image_formats/layer_rle.coffee')
+  LayerRAW: require('./image_formats/layer_raw.coffee')

lib/psd/image_formats/layer_raw.coffee

+module.exports =
+  parseRaw: ->
+    for i in [@chanPos...(@chanPos + @chan.length - 2)]
+      @channelData[i] = @file.readByte()
+
+    @chanPos += (@chan.length - 2)

lib/psd/image_formats/layer_rle.coffee

+module.exports =
+  parseByteCounts: ->
+    @file.readShort() for i in [0...@height()]
+
+  parseChannelData: ->
+    @lineIndex = 0
+    @decodeRLEChannel()

lib/psd/layer.coffee

@@ -8,7 +8,7 @@ module.exports = class Layer extends Module
   @includes require('./layer/name.coffee')
   @includes require('./layer/info.coffee')
   @includes require('./layer/helpers.coffee')
-  # @includes require('./layer/channel_image.coffee')
+  @includes require('./layer/channel_image.coffee')
 
   constructor: (@file, @header) ->
     @mask = {}
@@ -53,4 +53,4 @@ module.exports = class Layer extends Module
     opacity: @opacity
     visible: @visible
     clipped: @clipped
-    mask: @mask.export()
\ No newline at end of file
+    mask: @mask.export()

lib/psd/layer/channel_image.coffee

+ChannelImage = require '../channel_image.coffee'
+LazyExecute  = require '../lazy_execute.coffee'
+
+module.exports =
+  parseChannelImage: ->
+    image = new ChannelImage(@file, @header, @)
+    @image = new LazyExecute(image, @file)
+      .now('skip')
+      .later('parse')
+      .get()

lib/psd/layer_mask.coffee

@@ -36,6 +36,8 @@ module.exports = class LayerMask
       for i in [0...layerCount]
         @layers.push new Layer(@file, @header).parse()
 
+      layer.parseChannelImage() for layer in @layers
+
   parseGlobalMask: ->
     length = @file.readInt()
     return if length <= 0
@@ -56,4 +58,4 @@ module.exports = class LayerMask
       # 0 = color selected, 1 = color protected, 128 = use value per layer
       mask.kind = @file.readByte()
 
-    @file.seek maskEnd
\ No newline at end of file
+    @file.seek maskEnd

lib/psd/node.coffee

@@ -4,6 +4,7 @@ _        = require 'lodash'
 module.exports = class Node extends Module
   @includes require('./nodes/ancestry.coffee')
   @includes require('./nodes/search.coffee')
+  @includes require('./nodes/build_preview.coffee')
 
   @PROPERTIES: ['name', 'left', 'right', 'top', 'bottom', 'height', 'width']
 
@@ -93,4 +94,4 @@ module.exports = class Node extends Module
     @left = _.min(nonEmptyChildren.map((c) -> c.left)) or 0
     @top = _.min(nonEmptyChildren.map((c) -> c.top)) or 0
     @bottom = _.max(nonEmptyChildren.map((c) -> c.bottom)) or 0
-    @right = _.max(nonEmptyChildren.map((c) -> c.right)) or 0
\ No newline at end of file
+    @right = _.max(nonEmptyChildren.map((c) -> c.right)) or 0

lib/psd/nodes/build_preview.coffee

+module.exports =
+  toPng: -> @layer.image.toPng()
+  saveAsPng: (output) -> @layer.image.saveAsPng(output)

lib/psd/nodes/group.coffee

@@ -13,4 +13,4 @@ module.exports = class Group extends Node
   export: ->
     _.merge super(),
       type: 'group'
-      children: @_children.map((c) -> c.export())
\ No newline at end of file
+      children: @_children.map((c) -> c.export())

lib/psd/nodes/layer.coffee

@@ -10,4 +10,4 @@ module.exports = class Layer extends Node
     _.merge super,
       type: 'layer'
       mask: @layer.mask.export()
-      image: {}
\ No newline at end of file
+      image: {}