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Class: Vips::Source

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

Overview

A source. For example:

source = Vips ::Source.new_from_file ("k2.jpg")
image = Vips ::Image .new_from_source (source)

Direct Known Subclasses

SourceCustom

Defined Under Namespace

Modules: SourceLayout 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_from_descriptor(descriptor) ⇒ Source

Create a new source from a file descriptor. File descriptors are small integers, for example 0 is stdin.

Pass sources to Image.new_from_source to load images from them.

Parameters:

  • descriptor (Integer) —

    the file descriptor

Returns:

  • (Source ) —

    the new Vips::Source

Raises:

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# File 'lib/vips/source.rb', line 48
def self.new_from_descriptor(descriptor)
 ptr = Vips .vips_source_new_from_descriptor descriptor
 raise Vips ::Error  if ptr.null?
 Vips ::Source .new  ptr
end

.new_from_file(filename) ⇒ Source

Create a new source from a file name.

Pass sources to Image.new_from_source to load images from them.

Parameters:

  • filename (String) —

    the name of the file

Returns:

  • (Source ) —

    the new Vips::Source

Raises:

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# File 'lib/vips/source.rb', line 62
def self.new_from_file(filename)
 raise Vips ::Error , "filename is nil" if filename.nil?
 ptr = Vips .vips_source_new_from_file filename
 raise Vips ::Error  if ptr.null?
 Vips ::Source .new  ptr
end

.new_from_memory(data) ⇒ Source

Create a new source from an area of memory. Memory areas can be strings, arrays and so forth -- anything that supports bytesize.

Pass sources to Image.new_from_source to load images from them.

Parameters:

  • data (String) —

    memory area

Returns:

  • (Source ) —

    the new Vips::Source

Raises:

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# File 'lib/vips/source.rb', line 78
def self.new_from_memory(data)
 ptr = Vips .vips_source_new_from_memory data, data.bytesize
 raise Vips ::Error  if ptr.null?
 # FIXME do we need to keep a ref to the underlying memory area? what
 # about Image.new_from_buffer? Does that need a secret ref too?

 Vips ::Source .new  ptr
end

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