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
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
# -*- coding: utf-8 -*-
miquire :lib, 'retriever/mixin/photo_mixin'
module Retriever::PhotoMixin
GdkPixbufCache = Struct.new(:pixbuf, :width, :height, :read_count, :reserver)
# 特定のサイズのPixbufを作成するDeferredを返す
def download_pixbuf(width:, height:)
cache_get_defer(width: width, height: height).trap do |err|
error err if err
gen_pixbuf_from_raw_data(width: width, height: height)
end
end
private
def gen_pixbuf_from_raw_data(width:, height:)
download.next{|photo|
pb = pixbuf_cache_get(width: width, height: height)
if pb
pb
else
loader = Gdk::PixbufLoader.new
loader.write photo.blob
loader.close
pb = loader.pixbuf
pixbuf_cache_set(pb.scale(*calc_fitclop(pb, Gdk::Rectangle.new(0, 0, width, height))),
width: width,
height: height)
end
}
end
def cache_get_defer(width:, height:)
Deferred.new.next do
result = pixbuf_cache_get(width: width, height: height)
if result
result
else
Deferred.fail(result)
end
end
end
def pixbuf_cache_get(width:, height:)
result = pixbuf_cache[[width, height].hash]
if result
result.read_count += 1
result.reserver.cancel
result.reserver = pixbuf_forget([width, height].hash, result.read_count)
result.pixbuf
end
end
def pixbuf_cache_set(pixbuf, width:, height:)
if pixbuf_cache[[width, height].hash]
error "cache already exists for #{uri} #{width}*#{height}"
pixbuf_cache_get(width: width, height: height)
else
key = [width, height].hash
pixbuf_cache[key] =
GdkPixbufCache.new(pixbuf, width, height, 0, pixbuf_forget(key, 0))
pixbuf
end
end
def pixbuf_cache
@pixbuf_cache ||= Hash.new
end
def pixbuf_forget(key, gen)
Reserver.new([300, 60 * gen ** 2].max) do
pixbuf_cache.delete(key)
end
end
# _src_ が _rect_ にアスペクト比を維持した状態で内接するように縮小した場合のサイズを返す
# ==== Args
# [src] 元の寸法(Gtk::Rectangle)
# [dst] 収めたい枠の寸法(Gtk::Rectangle)
# ==== Return
# 幅(px), 高さ(px)
def calc_fitclop(src, dst)
if (dst.width * src.height) > (dst.height * src.width)
return src.width * dst.height / src.height, dst.height
else
return dst.width, src.height * dst.width / src.width
end
end
end
|
