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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
|
module CarrierWave
##
# This module simplifies manipulation with MiniMagick by providing a set
# of convenient helper methods. If you want to use them, you'll need to
# require this file:
#
# require 'carrierwave/processing/mini_magick'
#
# And then include it in your uploader:
#
# class MyUploader < CarrierWave::Uploader::Base
# include CarrierWave::MiniMagick
# end
#
# You can now use the provided helpers:
#
# class MyUploader < CarrierWave::Uploader::Base
# include CarrierWave::MiniMagick
#
# process :resize_to_fit => [200, 200]
# end
#
# Or create your own helpers with the powerful manipulate! method. Check
# out the ImageMagick docs at http://www.imagemagick.org/script/command-line-options.php for more
# info
#
# class MyUploader < CarrierWave::Uploader::Base
# include CarrierWave::MiniMagick
#
# process :radial_blur => 10
#
# def radial_blur(amount)
# manipulate! do |img|
# img.radial_blur(amount)
# img = yield(img) if block_given?
# img
# end
# end
# end
#
# === Note
#
# MiniMagick is a mini replacement for RMagick that uses the command line
# tool "mogrify" for image manipulation.
#
# You can find more information here:
#
# http://mini_magick.rubyforge.org/
# and
# https://github.com/minimagick/minimagick/
#
#
module MiniMagick
extend ActiveSupport::Concern
included do
begin
require "mini_magick"
rescue LoadError => e
e.message << " (You may need to install the mini_magick gem)"
raise e
end
prepend Module.new {
def initialize(*)
super
@format = nil
end
}
end
module ClassMethods
def convert(format)
process :convert => format
end
def resize_to_limit(width, height)
process :resize_to_limit => [width, height]
end
def resize_to_fit(width, height)
process :resize_to_fit => [width, height]
end
def resize_to_fill(width, height, gravity='Center')
process :resize_to_fill => [width, height, gravity]
end
def resize_and_pad(width, height, background=:transparent, gravity='Center')
process :resize_and_pad => [width, height, background, gravity]
end
end
##
# Changes the image encoding format to the given format
#
# See http://www.imagemagick.org/script/command-line-options.php#format
#
# === Parameters
#
# [format (#to_s)] an abreviation of the format
#
# === Yields
#
# [MiniMagick::Image] additional manipulations to perform
#
# === Examples
#
# image.convert(:png)
#
def convert(format, page=nil)
@format = format
@page = page
manipulate! do |img|
img = yield(img) if block_given?
img
end
end
##
# Resize the image to fit within the specified dimensions while retaining
# the original aspect ratio. Will only resize the image if it is larger than the
# specified dimensions. The resulting image may be shorter or narrower than specified
# in the smaller dimension but will not be larger than the specified values.
#
# === Parameters
#
# [width (Integer)] the width to scale the image to
# [height (Integer)] the height to scale the image to
#
# === Yields
#
# [MiniMagick::Image] additional manipulations to perform
#
def resize_to_limit(width, height, combine_options: {})
width = dimension_from width
height = dimension_from height
manipulate! do |img|
img.combine_options do |cmd|
cmd.resize "#{width}x#{height}>"
append_combine_options cmd, combine_options
end
img = yield(img) if block_given?
img
end
end
##
# Resize the image to fit within the specified dimensions while retaining
# the original aspect ratio. The image may be shorter or narrower than
# specified in the smaller dimension but will not be larger than the specified values.
#
# === Parameters
#
# [width (Integer)] the width to scale the image to
# [height (Integer)] the height to scale the image to
#
# === Yields
#
# [MiniMagick::Image] additional manipulations to perform
#
def resize_to_fit(width, height, combine_options: {})
width = dimension_from width
height = dimension_from height
manipulate! do |img|
img.combine_options do |cmd|
cmd.resize "#{width}x#{height}"
append_combine_options cmd, combine_options
end
img = yield(img) if block_given?
img
end
end
##
# Resize the image to fit within the specified dimensions while retaining
# the aspect ratio of the original image. If necessary, crop the image in the
# larger dimension.
#
# === Parameters
#
# [width (Integer)] the width to scale the image to
# [height (Integer)] the height to scale the image to
# [gravity (String)] the current gravity suggestion (default: 'Center'; options: 'NorthWest', 'North', 'NorthEast', 'West', 'Center', 'East', 'SouthWest', 'South', 'SouthEast')
#
# === Yields
#
# [MiniMagick::Image] additional manipulations to perform
#
def resize_to_fill(width, height, gravity = 'Center', combine_options: {})
width = dimension_from width
height = dimension_from height
manipulate! do |img|
cols, rows = img[:dimensions]
img.combine_options do |cmd|
if width != cols || height != rows
scale_x = width/cols.to_f
scale_y = height/rows.to_f
if scale_x >= scale_y
cols = (scale_x * (cols + 0.5)).round
rows = (scale_x * (rows + 0.5)).round
cmd.resize "#{cols}"
else
cols = (scale_y * (cols + 0.5)).round
rows = (scale_y * (rows + 0.5)).round
cmd.resize "x#{rows}"
end
end
cmd.gravity gravity
cmd.background "rgba(255,255,255,0.0)"
cmd.extent "#{width}x#{height}" if cols != width || rows != height
append_combine_options cmd, combine_options
end
img = yield(img) if block_given?
img
end
end
##
# Resize the image to fit within the specified dimensions while retaining
# the original aspect ratio. If necessary, will pad the remaining area
# with the given color, which defaults to transparent (for gif and png,
# white for jpeg).
#
# See http://www.imagemagick.org/script/command-line-options.php#gravity
# for gravity options.
#
# === Parameters
#
# [width (Integer)] the width to scale the image to
# [height (Integer)] the height to scale the image to
# [background (String, :transparent)] the color of the background as a hexcode, like "#ff45de"
# [gravity (String)] how to position the image
#
# === Yields
#
# [MiniMagick::Image] additional manipulations to perform
#
def resize_and_pad(width, height, background=:transparent, gravity='Center', combine_options: {})
width = dimension_from width
height = dimension_from height
manipulate! do |img|
img.combine_options do |cmd|
cmd.thumbnail "#{width}x#{height}>"
if background == :transparent
cmd.background "rgba(255, 255, 255, 0.0)"
else
cmd.background background
end
cmd.gravity gravity
cmd.extent "#{width}x#{height}"
append_combine_options cmd, combine_options
end
img = yield(img) if block_given?
img
end
end
##
# Returns the width of the image in pixels.
#
# === Returns
#
# [Integer] the image's width in pixels
#
def width
mini_magick_image[:width]
end
##
# Returns the height of the image in pixels.
#
# === Returns
#
# [Integer] the image's height in pixels
#
def height
mini_magick_image[:height]
end
##
# Manipulate the image with MiniMagick. This method will load up an image
# and then pass each of its frames to the supplied block. It will then
# save the image to disk.
#
# === Gotcha
#
# This method assumes that the object responds to +current_path+.
# Any class that this module is mixed into must have a +current_path+ method.
# CarrierWave::Uploader does, so you won't need to worry about this in
# most cases.
#
# === Yields
#
# [MiniMagick::Image] manipulations to perform
#
# === Raises
#
# [CarrierWave::ProcessingError] if manipulation failed.
#
def manipulate!
cache_stored_file! if !cached?
image = ::MiniMagick::Image.open(current_path)
begin
image.format(@format.to_s.downcase, @page) if @format
image = yield(image)
image.write(current_path)
if @format
move_to = current_path.chomp(File.extname(current_path)) + ".#{@format}"
file.content_type = ::MIME::Types.type_for(move_to).first.to_s
file.move_to(move_to, permissions, directory_permissions)
end
image.run_command("identify", current_path)
ensure
image.destroy!
end
rescue ::MiniMagick::Error, ::MiniMagick::Invalid => e
message = I18n.translate(:"errors.messages.mini_magick_processing_error", :e => e)
raise CarrierWave::ProcessingError, message
end
private
def append_combine_options(cmd, combine_options)
combine_options.each do |method, options|
if options.nil?
cmd.send(method)
else
cmd.send(method, options)
end
end
end
def dimension_from(value)
return value unless value.instance_of?(Proc)
value.arity >= 1 ? value.call(self) : value.call
end
def mini_magick_image
::MiniMagick::Image.read(read)
end
end # MiniMagick
end # CarrierWave
|
