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Class: Vips::Target

Inherits:
Connection show all
Defined in:
lib/vips/target.rb

Overview

A target. For example:

target = Vips ::Target.new_to_file ('k2.jpg')
image.write_to_target(target, '.jpg')

Direct Known Subclasses

TargetCustom

Defined Under Namespace

Modules: TargetLayout Classes: ManagedStruct , Struct

Instance Attribute Summary

Attributes inherited from GObject::GObject

#ptr , #references

Class Method Summary collapse

Methods inherited from Connection

#filename , #nick

Methods inherited from Object

#get , #get_pspec , #get_typeof , #get_typeof_error , print_all , #set , #signal_connect

Methods inherited from GObject::GObject

#ffi_managed_struct , ffi_managed_struct , #ffi_struct , ffi_struct , #initialize

Constructor Details

This class inherits a constructor from GObject::GObject

Class Method Details

.new_to_descriptor(descriptor) ⇒ Target

Create a new target to a file descriptor. File descriptors are small integers, for example 1 is stdout.

Pass targets to Image#write_to_target to write images to them.

Parameters:

  • descriptor (Integer)

    the file descriptor

Returns:

  • (Target )

    the new Vips::Target

Raises:

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# File 'lib/vips/target.rb', line 49
def self.new_to_descriptor(descriptor)
 ptr = Vips .vips_target_new_to_descriptor descriptor
 raise Vips ::Error  if ptr.null?
 Vips ::Target .new  ptr
end

.new_to_file(filename) ⇒ Target

Create a new target to a file name.

Pass targets to Image#write_to_target to write images to them.

Parameters:

  • filename (String)

    the name of the file

Returns:

  • (Target )

    the new Vips::Target

Raises:

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# File 'lib/vips/target.rb', line 63
def self.new_to_file(filename)
 raise Vips ::Error , "filename is nil" if filename.nil?
 ptr = Vips .vips_target_new_to_file filename
 raise Vips ::Error  if ptr.null?
 Vips ::Target .new  ptr
end

.new_to_memoryTarget

Create a new target to an area of memory.

Pass targets to Image#write_to_target to write images to them.

Once the image has been written, use Object#get ("blob") to read out the data.

Returns:

  • (Target )

    the new Vips::Target

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# File 'lib/vips/target.rb', line 80
def self.new_to_memory
 ptr = Vips .vips_target_new_to_memory
 Vips ::Target .new  ptr
end

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