Class: Vips::Argument

Inherits:

Object

• Object
• Vips::Argument

show all

Defined in:

lib/vips8/argument.rb

Overview

Defined Under Namespace

Classes: ArrayImageConst

Instance Attribute Summary (collapse)

• - (Object) flags readonly

  :nodoc:.

• - (Object) isset readonly

  :nodoc:.

• - (Object) name readonly

  :nodoc:.

• - (Object) op readonly

  :nodoc:.

• - (Object) priority readonly

  :nodoc:.

• - (Object) prop readonly

  :nodoc:.

Instance Method Summary (collapse)

• - (Object) description
• - (Object) get_value
• - (Argument) initialize(op, name) constructor

  A new instance of Argument.

• - (Object) set_value(match_image, value)

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# File 'lib/vips8/argument.rb', line 9

def initialize(op, name)
    @op = op
    @name = name.tr '-', '_'
    @prop = op.gtype.to_class.property name
    @flags = op.get_argument_flags name
    @priority = op.get_argument_priority @name
    @isset = op.argument_isset @name
end

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# File 'lib/vips8/argument.rb', line 7

def flags
  @flags
end

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# File 'lib/vips8/argument.rb', line 7

def isset
  @isset
end

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# File 'lib/vips8/argument.rb', line 7

def name
  @name
end

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# File 'lib/vips8/argument.rb', line 7

def op
  @op
end

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# File 'lib/vips8/argument.rb', line 7

def priority
  @priority
end

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# File 'lib/vips8/argument.rb', line 7

def prop
  @prop
end

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# File 'lib/vips8/argument.rb', line 143

def description
    blurb = prop.blurb
    direction = (flags & :input) != 0 ?  "input" : "output"
    type = prop.value_type.name

    result = "[#{name}] #{blurb}, #{direction} #{type}"
end

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# File 'lib/vips8/argument.rb', line 139

def get_value
    Argument::unwrap @op.get_property(@name)
end

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# File 'lib/vips8/argument.rb', line 108

def set_value(match_image, value)
    # array-ize
    value = Argument::arrayize prop.value_type, value

    # blob-ize
    if prop.value_type.type_is_a? GLib::Type["VipsBlob"]
        if not value.is_a? Vips::Blob
            value = Vips::Blob.copy value
        end
    end

    # image-ize
    if prop.value_type.type_is_a? GLib::Type["VipsImage"]
        if not value.is_a? Vips::Image
            value = Argument::imageize match_image, value
        end
    end

    # MODIFY input images need to be copied before assigning them
    if (flags & :modify) != 0
        # don't use .copy(): we want to make a new pipeline with no
        # reference back to the old stuff ... this way we can free the
        # previous image earlier 
        new_image = Vips::Image.memory
        value.write new_image
        value = new_image
    end

    op.set_property @name, value
end