Class: PSD::LayerMask

Inherits:
Object
  • Object
show all
Defined in:
lib/psd/layer_mask.rb

Overview

Covers parsing the global mask and controls parsing of all the layers/folders in the document.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file, header, options) ⇒ LayerMask

Store a reference to the file and the header and initialize the defaults.



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# File 'lib/psd/layer_mask.rb', line 8

def initialize(file, header, options)
  @file = file
  @header = header
  @options = options

  @layers = []
  @merged_alpha = false
  @global_mask = nil
end

Instance Attribute Details

#global_mask ⇒ Object (readonly)

Returns the value of attribute global_mask.



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# File 'lib/psd/layer_mask.rb', line 5

def global_mask
  @global_mask
end

#layers ⇒ Object (readonly)

Returns the value of attribute layers.



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# File 'lib/psd/layer_mask.rb', line 5

def layers
  @layers
end

Instance Method Details

#parse ⇒ Object

Parse this section, including all of the layers and folders.



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# File 'lib/psd/layer_mask.rb', line 26

def parse
  mask_size = parse_mask_size

  start_position = @file.tell
  finish = start_position + mask_size

  PSD.logger.debug "Layer mask section: #{start_position} - #{finish}"

  return self if mask_size <= 0

  parse_layers
  parse_global_mask

  consumed_bytes = @file.tell - start_position
  parse_layer_tagged_blocks(mask_size - consumed_bytes)

  # Layers are parsed in reverse order
  layers.reverse!

  # Ensure we're at the end of this section
  @file.seek finish

  self
end

#skip ⇒ Object

Allows us to skip this section because it starts with the length of the section stored as an integer.



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# File 'lib/psd/layer_mask.rb', line 20

def skip
  @file.seek parse_mask_size, IO::SEEK_CUR
  return self
end