1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
# frozen_string_literal: true
module Prawn # rubocop: disable Style/Documentation
# @group Extension API
# Image handler.
#
# @return [ImageHandler]
def self.image_handler
@image_handler ||= ImageHandler.new
end
# ImageHandler provides a way to register image processors with Prawn.
class ImageHandler
# @private
def initialize
@handlers = []
end
# Register an image handler.
#
# @param handler [Object]
# @return [void]
def register(handler)
@handlers.delete(handler)
@handlers.push(handler)
end
# Register an image handler with the highest priority.
#
# @param handler [Object]
# @return [void]
def register!(handler)
@handlers.delete(handler)
@handlers.unshift(handler)
end
# Unregister an image handler.
#
# @param handler [Object]
# @return [void]
def unregister(handler)
@handlers.reject! { |h| h == handler }
end
# Find an image handler for an image.
#
# @param image_blob [String]
# @return [Object]
# @raise [Prawn::Errors::UnsupportedImageType] If no image handler were
# found for the image.
def find(image_blob)
handler = @handlers.find { |h| h.can_render?(image_blob) }
return handler if handler
raise Prawn::Errors::UnsupportedImageType,
'image file is an unrecognised format'
end
end
end
|
