Class: HexaPDF::Type::Resources

Inherits:
Dictionary show all
Defined in:
lib/hexapdf/type/resources.rb

Overview

Represents the resources needed by a content stream.

See: PDF1.7 s7.8.3

Constant Summary

Constants included from DictionaryFields

DictionaryFields::Boolean, DictionaryFields::PDFByteString, DictionaryFields::PDFDate

Constants inherited from Object

Object::NOT_DUPLICATABLE_CLASSES

Instance Attribute Summary

Attributes inherited from Object

#data, #document, #must_be_indirect

Instance Method Summary collapse

Methods inherited from Dictionary

#[], #[]=, define_field, #delete, #each, each_field, #empty?, field, #key?, #to_hash

Methods inherited from Object

#<=>, #==, deep_copy, #deep_copy, #document?, #eql?, #gen, #gen=, #hash, #indirect?, #initialize, #inspect, #must_be_indirect?, #null?, #oid, #oid=, #validate, #value, #value=

Constructor Details

This class inherits a constructor from HexaPDF::Object

Instance Method Details

#add_color_space(color_space) ⇒ Object

Adds the color space to the resources and returns the name under which it is stored.

If there already exists a color space with the same definition, it is reused. The device color spaces :DeviceGray, :DeviceRGB and :DeviceCMYK are never stored, their respective name is just returned.



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# File 'lib/hexapdf/type/resources.rb', line 94

def add_color_space(color_space)
  family = color_space.family
  return family if family == :DeviceRGB || family == :DeviceGray || family == :DeviceCMYK

  definition = color_space.definition
  self[:ColorSpace] = {} unless key?(:ColorSpace)
  color_space_dict = self[:ColorSpace]

  name, _value = color_space_dict.value.find do |_k, v|
    v.map! {|item| document.deref(item)}
    v == definition
  end
  unless name
    name = create_resource_name(color_space_dict.value, 'CS')
    color_space_dict[name] = definition
  end
  name
end

#add_ext_gstate(object) ⇒ Object

Adds the graphics state parameter dictionary to the resources and returns the name under which it is stored.

If there already exists a name for the given dictionary, it is just returned.



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# File 'lib/hexapdf/type/resources.rb', line 139

def add_ext_gstate(object)
  object_setter(:ExtGState, 'GS'.freeze, object)
end

#add_font(object) ⇒ Object

Adds the font dictionary to the resources and returns the name under which it is stored.

If there already exists a name for the given dictionary, it is just returned.



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# File 'lib/hexapdf/type/resources.rb', line 153

def add_font(object)
  object_setter(:Font, 'F'.freeze, object)
end

#add_xobject(object) ⇒ Object

Adds the XObject to the resources and returns the name under which it is stored.

If there already exists a name for the given XObject, it is just returned.



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# File 'lib/hexapdf/type/resources.rb', line 123

def add_xobject(object)
  object_setter(:XObject, 'XO'.freeze, object)
end

#color_space(name) ⇒ Object

Returns the color space stored under the given name.

If the color space is not found, an error is raised.

Note: The color spaces :DeviceGray, :DeviceRGB and :DeviceCMYK are returned without a lookup since they are fixed.



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# File 'lib/hexapdf/type/resources.rb', line 67

def color_space(name)
  case name
  when :DeviceRGB, :DeviceGray, :DeviceCMYK
    GlobalConfiguration.constantize('color_space.map'.freeze, name).new
  else
    space_definition = self[:ColorSpace] && self[:ColorSpace][name]
    if space_definition.nil?
      raise HexaPDF::Error, "Color space '#{name}' not found in the resources"
    elsif space_definition.kind_of?(Array)
      space_definition.map! {|item| document.deref(item)}
      space_family = space_definition[0]
    else
      space_family = space_definition
      space_definition = [space_definition]
    end

    GlobalConfiguration.constantize('color_space.map'.freeze, space_family) do
      HexaPDF::Content::ColorSpace::Universal
    end.new(space_definition)
  end
end

#ext_gstate(name) ⇒ Object

Returns the graphics state parameter dictionary (see Type::GraphicsStateParameter) stored under the given name.

If the dictionary is not found, an error is raised.



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# File 'lib/hexapdf/type/resources.rb', line 131

def ext_gstate(name)
  object_getter(:ExtGState, name)
end

#font(name) ⇒ Object

Returns the font dictionary stored under the given name.

If the dictionary is not found, an error is raised.



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# File 'lib/hexapdf/type/resources.rb', line 146

def font(name)
  object_getter(:Font, name)
end

#type ⇒ Object

Returns :XXResources.



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# File 'lib/hexapdf/type/resources.rb', line 57

def type
  :XXResources
end

#xobject(name) ⇒ Object

Returns the XObject stored under the given name.

If the XObject is not found, an error is raised.



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# File 'lib/hexapdf/type/resources.rb', line 116

def xobject(name)
  object_getter(:XObject, name)
end