Class: PSD::Renderer::Mask

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(canvas, options = {}) ⇒ Mask

Returns a new instance of Mask.



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# File 'lib/psd/renderer/mask.rb', line 6

def initialize(canvas, options = {})
  @canvas = canvas
  @layer = canvas.node
  @options = options

  @pixel_data = @canvas.pixels
  @mask_data = @layer.image.mask_data

  @layer_width = (@layer.folder? ? @layer.mask.width : @layer.width).to_i
  @layer_height = (@layer.folder? ? @layer.mask.height : @layer.height).to_i
end

Instance Attribute Details

#layer_height ⇒ Object

Returns the value of attribute layer_height.



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# File 'lib/psd/renderer/mask.rb', line 4

def layer_height
  @layer_height
end

#layer_width ⇒ Object

Returns the value of attribute layer_width.



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# File 'lib/psd/renderer/mask.rb', line 4

def layer_width
  @layer_width
end

#mask_data ⇒ Object

Returns the value of attribute mask_data.



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# File 'lib/psd/renderer/mask.rb', line 4

def mask_data
  @mask_data
end

#pixel_data ⇒ Object

Returns the value of attribute pixel_data.



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# File 'lib/psd/renderer/mask.rb', line 4

def pixel_data
  @pixel_data
end

Instance Method Details

#apply! ⇒ Object 



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# File 'lib/psd/renderer/mask.rb', line 18

def apply!
  PSD.logger.debug "Applying mask to #{@layer.name}"
  
  # We generate the preview at the document size instead to make applying the mask
  # significantly easier.
  width = @layer.header.width.to_i
  height = @layer.header.height.to_i
  png = ChunkyPNG::Canvas.new(width, height, ChunkyPNG::Color::TRANSPARENT)

  i = 0
  @layer_height.times do |y|
    @layer_width.times do |x|
      offset_x = x + @layer.left
      offset_y = y + @layer.top

      i +=1 and next if offset_x < 0 || offset_y < 0 || offset_x >= png.width || offset_y >= png.height

      png[offset_x, offset_y] = @pixel_data[i]
      i += 1
    end
  end
  
  # Now we apply the mask
  i = 0
  @layer.mask.height.times do |y|
    @layer.mask.width.times do |x|
      offset_x = @layer.mask.left + x
      offset_y = @layer.mask.top + y

      i += 1 and next if offset_x < 0 || offset_y < 0 || offset_x >= png.width || offset_y >= png.height

      color = ChunkyPNG::Color.to_truecolor_alpha_bytes(png[offset_x, offset_y])
      color[3] = color[3] * @mask_data[i] / 255

      png[offset_x, offset_y] = ChunkyPNG::Color.rgba(*color)
      i += 1
    end
  end

  crop_left = PSD::Util.clamp(@layer.left, 0, png.width)
  crop_top = PSD::Util.clamp(@layer.top, 0, png.height)
  crop_width = PSD::Util.clamp(@layer_width, 0, png.width - crop_left)
  crop_height = PSD::Util.clamp(@layer_height, 0, png.height - crop_top)

  png.crop!(crop_left, crop_top, crop_width, crop_height)

  @canvas.canvas = png
end