Class: Vips::TargetCustom

Overview

file = File.open "some/file/name", "wb"
target = Vips ::TargetCustom.new 
target.on_write { |bytes| file.write bytes }
image.write_to_target target, ".png"

Defined Under Namespace

Modules: TargetCustomLayout Classes: ManagedStruct , Struct

Instance Attribute Summary

Attributes inherited from GObject::GObject

#ptr , #references

Instance Method Summary collapse

• #initialize ⇒ TargetCustom constructor

  A new instance of TargetCustom.

• #on_finish(&block) ⇒ Object

  The block is executed at the end of write.

• #on_write {|bytes| ... } ⇒ Object

  The block is executed to write data to the source.

Methods inherited from Target

new_to_descriptor , new_to_file , new_to_memory

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

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# File 'lib/vips/targetcustom.rb', line 46
def initialize
 pointer = Vips .vips_target_custom_new
 raise Vips ::Error  if pointer.null?
 super pointer
end

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# File 'lib/vips/targetcustom.rb', line 71
def on_finish &block
 signal_connect "finish" do
 block.call
 end
end

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# File 'lib/vips/targetcustom.rb', line 59
def on_write &block
 signal_connect "write" do |p, len|
 chunk = p.get_bytes(0, len)
 bytes_written = block.call chunk
 chunk.clear
 bytes_written
 end
end