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# blend_mode.coffee

lib/psd/

¶

    {Module} = require 'coffeescript-module'

¶

The blend mode describes important data regarding a layer, such as the blending mode, the opacity, and whether it's a part of a clipping mask.

    module.exports = class BlendMode extends Module
      @aliasProperty 'blendingMode', 'mode'

¶

All of the blend modes are stored in the PSD file with a specific key. This is the mapping of that key to its readable name.

      BLEND_MODES = {
        norm: 'normal',
        dark: 'darken',
        lite: 'lighten',
        hue:  'hue',
        sat:  'saturation',
        colr: 'color',
        lum:  'luminosity',
        mul:  'multiply',
        scrn: 'screen',
        diss: 'dissolve',
        over: 'overlay',
        hLit: 'hard_light',
        sLit: 'soft_light',
        diff: 'difference',
        smud: 'exclusion',
        div:  'color_dodge',
        idiv: 'color_burn',
        lbrn: 'linear_burn',
        lddg: 'linear_dodge',
        vLit: 'vivid_light',
        lLit: 'linear_light',
        pLit: 'pin_light',
        hMix: 'hard_mix',
        pass: 'passthru',
        dkCl: 'darker_color',
        lgCl: 'lighter_color',
        fsub: 'subtract',
        fdiv: 'divide'
      }

      constructor: (@file) ->

¶

The 4 character key for the blending mode.

        @blendKey = null

¶

The opacity of the layer, from [0, 255].

        @opacity = null

¶

Raw value for the clipping state of this layer.

        @clipping = null

¶

Is this layer a clipping mask?

        @clipped = null
        @flags = null

¶

The readable representation of the blend mode.

        @mode = null

¶

Is this layer visible?

        @visible = null

¶

Parses the blend mode data.

      parse: ->
        @file.seek 4, true

        @blendKey = @file.readString(4).trim()
        @opacity = @file.readByte()
        @clipping = @file.readByte()
        @flags = @file.readByte()

        @mode = BLEND_MODES[@blendKey]
        @clipped = @clipping is 1

        @visible = !((@flags & (0x01 << 1)) > 0)

        @file.seek 1, true

¶

Returns the layer opacity as a percentage.

      opacityPercentage: -> @opacity * 100 / 255

generated Tue May 12 2015 10:08:54 GMT-0400 (EDT)