Repository navigation
Expand file tree
/
Copy pathmini_magick.rb
More file actions
532 lines (471 loc) · 20.6 KB
/
Copy pathmini_magick.rb
File metadata and controls
532 lines (471 loc) · 20.6 KB
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
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
require 'tempfile'
require 'subexec'
require 'stringio'
require 'pathname'
require 'shellwords'
module MiniMagick
class << self
attr_accessor :processor
attr_accessor :timeout
# Experimental method for automatically selecting a processor
# such as gm. Only works on *nix.
#
# TODO: Write tests for this and figure out what platforms it supports
def choose_processor
if `type -P mogrify`.size > 0
return
elsif `type -P gm`.size > 0
self.processor = "gm"
end
end
def image_magick_version
@@version ||= Gem::Version.create(`mogrify --version`.split(" ")[2].split("-").first)
end
def minimum_image_magick_version
@@minimum_version ||= Gem::Version.create("6.6.3")
end
def valid_version_installed?
image_magick_version >= minimum_image_magick_version
end
end
MOGRIFY_COMMANDS = %w{adaptive-blur adaptive-resize adaptive-sharpen adjoin affine alpha annotate antialias append attenuate authenticate auto-gamma auto-level auto-orient backdrop background bench bias black-point-compensation black-threshold blend blue-primary blue-shift blur border bordercolor borderwidth brightness-contrast cache caption cdl channel charcoal chop clamp clip clip-mask clip-path clone clut coalesce colorize colormap color-matrix colors colorspace combine comment compose composite compress contrast contrast-stretch convolve crop cycle debug decipher deconstruct define delay delete density depth descend deskew despeckle direction displace display dispose dissimilarity-threshold dissolve distort dither draw duplicate edge emboss encipher encoding endian enhance equalize evaluate evaluate-sequence extent extract family features fft fill filter flatten flip floodfill flop font foreground format frame function fuzz fx gamma gaussian-blur geometry gravity green-primary hald-clut help highlight-color iconGeometry iconic identify ift immutable implode insert intent interlace interpolate interline-spacing interword-spacing kerning label lat layers level level-colors limit linear-stretch linewidth liquid-rescale list log loop lowlight-color magnify map mask mattecolor median metric mode modulate monitor monochrome morph morphology mosaic motion-blur name negate noise normalize opaque ordered-dither orient page paint path pause pen perceptible ping pointsize polaroid poly posterize precision preview print process profile quality quantize quiet radial-blur raise random-threshold red-primary regard-warnings region remap remote render repage resample resize respect-parentheses reverse roll rotate sample sampling-factor scale scene screen seed segment selective-blur separate sepia-tone set shade shadow shared-memory sharpen shave shear sigmoidal-contrast silent size sketch smush snaps solarize sparse-color splice spread statistic stegano stereo stretch strip stroke strokewidth style subimage-search swap swirl synchronize taint text-font texture threshold thumbnail tile tile-offset tint title transform transparent transparent-color transpose transverse treedepth trim type undercolor unique-colors units unsharp update verbose version view vignette virtual-pixel visual watermark wave weight white-point white-threshold window window-group write}
IMAGE_CREATION_OPERATORS = %w{canvas caption gradient label logo pattern plasma radial radient rose text tile xc }
class Error < RuntimeError; end
class Invalid < StandardError; end
class Image
# @return [String] The location of the current working file
attr_accessor :path
# Class Methods
# -------------
class << self
# This is the primary loading method used by all of the other class methods.
#
# Use this to pass in a stream object. Must respond to Object#read(size) or be a binary string object (BLOBBBB)
#
# As a change from the old API, please try and use IOStream objects. They are much, much better and more efficient!
#
# Probably easier to use the #open method if you want to open a file or a URL.
#
# @param stream [IOStream, String] Some kind of stream object that needs to be read or is a binary String blob!
# @param ext [String] A manual extension to use for reading the file. Not required, but if you are having issues, give this a try.
# @return [Image]
def read(stream, ext = nil)
if stream.is_a?(String)
stream = StringIO.new(stream)
elsif stream.is_a?(StringIO)
# Do nothing, we want a StringIO-object
elsif stream.respond_to? :path
if File.respond_to?(:binread)
stream = StringIO.new File.binread(stream.path.to_s)
else
stream = StringIO.new File.open(stream.path.to_s,"rb") { |f| f.read }
end
end
create(ext) do |f|
while chunk = stream.read(8192)
f.write(chunk)
end
end
end
# @deprecated Please use Image.read instead!
def from_blob(blob, ext = nil)
warn "Warning: MiniMagick::Image.from_blob method is deprecated. Instead, please use Image.read"
create(ext) { |f| f.write(blob) }
end
# Creates an image object from a binary string blob which contains raw pixel data (i.e. no header data).
#
# === Returns
#
# * [Image] The loaded image.
#
# === Parameters
#
# * [blob] <tt>String</tt> -- Binary string blob containing raw pixel data.
# * [columns] <tt>Integer</tt> -- Number of columns.
# * [rows] <tt>Integer</tt> -- Number of rows.
# * [depth] <tt>Integer</tt> -- Bit depth of the encoded pixel data.
# * [map] <tt>String</tt> -- A code for the mapping of the pixel data. Example: 'gray' or 'rgb'.
# * [format] <tt>String</tt> -- The file extension of the image format to be used when creating the image object. Defaults to 'png'.
#
def import_pixels(blob, columns, rows, depth, map, format="png")
# Create an image object with the raw pixel data string:
image = create(".dat", validate = false) { |f| f.write(blob) }
# Use ImageMagick to convert the raw data file to an image file of the desired format:
converted_image_path = image.path[0..-4] + format
argument = "-size #{columns}x#{rows} -depth #{depth} #{map}:#{image.path} #{converted_image_path}"
cmd = CommandBuilder.new("convert", argument) #Example: convert -size 256x256 -depth 16 gray:blob.dat blob.png
image.run(cmd)
# Update the image instance with the path of the properly formatted image, and return:
image.path = converted_image_path
image
end
# Opens a specific image file either on the local file system or at a URI.
#
# Use this if you don't want to overwrite the image file.
#
# Extension is either guessed from the path or you can specify it as a second parameter.
#
# If you pass in what looks like a URL, we require 'open-uri' before opening it.
#
# @param file_or_url [String] Either a local file path or a URL that open-uri can read
# @param ext [String] Specify the extension you want to read it as
# @return [Image] The loaded image
def open(file_or_url, ext = nil)
file_or_url = file_or_url.to_s # Force it to be a String... hell or highwater
if file_or_url.include?("://")
require 'open-uri'
ext ||= File.extname(URI.parse(file_or_url).path)
self.read(Kernel::open(file_or_url), ext)
else
ext ||= File.extname(file_or_url)
File.open(file_or_url, "rb") do |f|
self.read(f, ext)
end
end
end
# @deprecated Please use MiniMagick::Image.open(file_or_url) now
def from_file(file, ext = nil)
warn "Warning: MiniMagick::Image.from_file is now deprecated. Please use Image.open"
open(file, ext)
end
# Used to create a new Image object data-copy. Not used to "paint" or that kind of thing.
#
# Takes an extension in a block and can be used to build a new Image object. Used
# by both #open and #read to create a new object! Ensures we have a good tempfile!
#
# @param ext [String] Specify the extension you want to read it as
# @param validate [Boolean] If false, skips validation of the created image. Defaults to true.
# @yield [IOStream] You can #write bits to this object to create the new Image
# @return [Image] The created image
def create(ext = nil, validate = true, &block)
begin
tempfile = Tempfile.new(['mini_magick', ext.to_s.downcase])
tempfile.binmode
block.call(tempfile)
tempfile.close
image = self.new(tempfile.path, tempfile)
if validate and !image.valid?
raise MiniMagick::Invalid
end
return image
ensure
tempfile.close if tempfile
end
end
end
# Create a new MiniMagick::Image object
#
# _DANGER_: The file location passed in here is the *working copy*. That is, it gets *modified*.
# you can either copy it yourself or use the MiniMagick::Image.open(path) method which creates a
# temporary file for you and protects your original!
#
# @param input_path [String] The location of an image file
# @todo Allow this to accept a block that can pass off to Image#combine_options
def initialize(input_path, tempfile = nil)
@path = input_path
@tempfile = tempfile # ensures that the tempfile will stick around until this image is garbage collected.
end
def escaped_path
Pathname.new(@path).to_s.inspect
end
# Checks to make sure that MiniMagick can read the file and understand it.
#
# This uses the 'identify' command line utility to check the file. If you are having
# issues with this, then please work directly with the 'identify' command and see if you
# can figure out what the issue is.
#
# @return [Boolean]
def valid?
run_command("identify", @path)
true
rescue MiniMagick::Invalid
false
end
# A rather low-level way to interact with the "identify" command. No nice API here, just
# the crazy stuff you find in ImageMagick. See the examples listed!
#
# @example
# image["format"] #=> "TIFF"
# image["height"] #=> 41 (pixels)
# image["width"] #=> 50 (pixels)
# image["colorspace"] #=> "DirectClassRGB"
# image["dimensions"] #=> [50, 41]
# image["size"] #=> 2050 (bits)
# image["original_at"] #=> 2005-02-23 23:17:24 +0000 (Read from Exif data)
# image["EXIF:ExifVersion"] #=> "0220" (Can read anything from Exif)
#
# @param format [String] A format for the "identify" command
# @see For reference see http://www.imagemagick.org/script/command-line-options.php#format
# @return [String, Numeric, Array, Time, O
10BC8
bject] Depends on the method called! Defaults to String for unknown commands
def [](value)
# Why do I go to the trouble of putting in newlines? Because otherwise animated gifs screw everything up
case value.to_s
when "colorspace"
run_command("identify", "-format", format_option("%r"), escaped_path).split("\n")[0].strip
when "format"
run_command("identify", "-format", format_option("%m"), escaped_path).split("\n")[0]
when "height"
run_command("identify", "-format", format_option("%h"), escaped_path).split("\n")[0].to_i
when "width"
run_command("identify", "-format", format_option("%w"), escaped_path).split("\n")[0].to_i
when "dimensions"
run_command("identify", "-format", format_option("%w %h"), escaped_path).split("\n")[0].split.map{|v|v.to_i}
when "size"
File.size(@path) # Do this because calling identify -format "%b" on an animated gif fails!
when "original_at"
# Get the EXIF original capture as a Time object
Time.local(*self["EXIF:DateTimeOriginal"].split(/:|\s+/)) rescue nil
when /^EXIF\:/i
result = run_command('identify', '-format', "\"%[#{value}]\"", escaped_path).chop
if result.include?(",")
read_character_data(result)
else
result
end
else
run_command('identify', '-format', "\"#{value}\"", escaped_path).split("\n")[0]
end
end
# Sends raw commands to imagemagick's `mogrify` command. The image path is automatically appended to the command.
#
# Remember, we are always acting on this instance of the Image when messing with this.
#
# @return [String] Whatever the result from the command line is. May not be terribly useful.
def <<(*args)
run_command("mogrify", *args << escaped_path)
end
# This is used to change the format of the image. That is, from "tiff to jpg" or something like that.
# Once you run it, the instance is pointing to a new file with a new extension!
#
# *DANGER*: This renames the file that the instance is pointing to. So, if you manually opened the
# file with Image.new(file_path)... then that file is DELETED! If you used Image.open(file) then
# you are ok. The original file will still be there. But, any changes to it might not be...
#
# Formatting an animation into a non-animated type will result in ImageMagick creating multiple
# pages (starting with 0). You can choose which page you want to manipulate. We default to the
# first page.
#
# If you would like to convert between animated formats, pass nil as your
# page and ImageMagick will copy all of the pages.
#
# @param format [String] The target format... like 'jpg', 'gif', 'tiff', etc.
# @param page [Integer] If this is an animated gif, say which 'page' you want
# with an integer. Default 0 will convert only the first page; 'nil' will
# convert all pages.
# @return [nil]
def format(format, page = 0)
c = CommandBuilder.new('mogrify', '-format', format)
yield c if block_given?
if page
c << @path + "[#{page}]"
else
c << @path
end
run(c)
old_path = @path.dup
@path.sub!(/(\.\w*)?$/, ".#{format}")
File.delete(old_path) if old_path != @path
unless File.exists?(@path)
raise MiniMagick::Error, "Unable to format to #{format}"
end
end
# Collapse images with sequences to the first frame (ie. animated gifs) and
# preserve quality
def collapse!
run_command("mogrify", "-quality", "100", "#{path}[0]")
end
# Writes the temporary file out to either a file location (by passing in a String) or by
# passing in a Stream that you can #write(chunk) to repeatedly
#
# @param output_to [IOStream, String] Some kind of stream object that needs to be read or a file path as a String
# @return [IOStream, Boolean] If you pass in a file location [String] then you get a success boolean. If its a stream, you get it back.
# Writes the temporary image that we are using for processing to the output path
def write(output_to)
if output_to.kind_of?(String) || !output_to.respond_to?(:write)
FileUtils.copy_file @path, output_to
run_command "identify", output_to.to_s.inspect # Verify that we have a good image
else # stream
File.open(@path, "rb") do |f|
f.binmode
while chunk = f.read(8192)
output_to.write(chunk)
end
end
output_to
end
end
# Gives you raw image data back
# @return [String] binary string
def to_blob
f = File.new @path
f.binmode
f.read
ensure
f.close if f
end
def mime_type
format = self[:format]
"image/" + format.to_s.downcase
end
# If an unknown method is called then it is sent through the mogrify program
# Look here to find all the commands (http://www.imagemagick.org/script/mogrify.php)
def method_missing(symbol, *args)
combine_options do |c|
c.send(symbol, *args)
end
end
# You can use multiple commands together using this method. Very easy to use!
#
# @example
# image.combine_options do |c|
# c.draw "image Over 0,0 10,10 '#{MINUS_IMAGE_PATH}'"
# c.thumbnail "300x500>"
# c.background background
# end
#
# @yieldparam command [CommandBuilder]
def combine_options(tool = "mogrify", &block)
c = CommandBuilder.new(tool)
c << @path if tool.to_s == "convert"
block.call(c)
c << @path
Rails.logger.debug "DEF combine options"
run(c)
end
# Check to see if we are running on win32 -- we need to escape things differently
def windows?
RUBY_PLATFORM =~ /mswin|mingw|cygwin/
end
def composite(other_image, output_extension = 'jpg', &block)
begin
second_tempfile = Tempfile.new(output_extension)
second_tempfile.binmode
ensure
second_tempfile.close
end
command = CommandBuilder.new("composite")
block.call(command) if block
command.push(other_image.path)
command.push(self.path)
command.push(second_tempfile.path)
run(command)
return Image.new(second_tempfile.path, second_tempfile)
end
# Outputs a carriage-return delimited format string for Unix and Windows
def format_option(format)
windows? ? "\"#{format}\\n\"" : "\"#{format}\\\\n\""
end
def run_command(command, *args)
# -ping "efficiently determine image characteristics."
if command == 'identify'
args.unshift '-ping'
args.unshift '-quiet' unless MiniMagick.processor.to_s == 'gm'
end
run(CommandBuilder.new(command, *args))
end
def run(command_builder)
command = command_builder.command
sub = Subexec.run(command, :timeout => MiniMagick.timeout)
Rails.logger.debug command
Rails.logger.debug "DEF RUN"
if sub.exitstatus != 0
# Clean up after ourselves in case of an error
destroy!
# Raise the appropriate error
if sub.output =~ /no decode delegate/i || sub.output =~ /did not return an image/i
raise Invalid, sub.output
else
# TODO: should we do something different if the command times out ...?
# its definitely better for logging.. otherwise we dont really know
raise Error, "Command (#{command.inspect.gsub("\\", "")}) failed: #{{:status_code => sub.exitstatus, :output => sub.output}.inspect}"
end
else
sub.output
end
end
def destroy!
return if @tempfile.nil?
File.unlink(@tempfile.path) if File.exists?(@tempfile.path)
@tempfile = nil
end
private
# Sometimes we get back a list of character values
def read_character_data(list_of_characters)
chars = list_of_characters.gsub(" ", "").split(",")
result = ""
chars.each do |val|
result << ("%c" % val.to_i)
end
result
end
end
class CommandBuilder
attr_reader :args
def initialize(tool, *options)
@tool = tool
@args = []
options.each { |arg| push(arg) }
end
def command
"#{MiniMagick.processor} #{@tool} #{@args.join(' ')}".strip
end
# Add each mogrify command in both underscore and dash format
MOGRIFY_COMMANDS.each do |mogrify_command|
# Example of what is generated here:
#
# def auto_orient(*options)
# add_command("auto-orient", *options)
# self
# end
# alias_method :"auto-orient", :auto_orient
dashed_command = mogrify_command.to_s.gsub("_","-")
underscored_command = mogrify_command.to_s.gsub("-","_")
define_method(underscored_command) do |*options|
add_command(__method__.to_s.gsub("_","-"), *options)
self
end
alias_method dashed_command, underscored_command
end
def format(*options)
raise Error, &quo
5AC0
t;You must call 'format' on the image object directly!"
end
IMAGE_CREATION_OPERATORS.each do |operator|
define_method operator do |*options|
add_creation_operator(__method__.to_s, *options)
self
end
end
def +(*options)
push(@args.pop.gsub(/^-/, '+'))
if options.any?
options.each do |o|
push escape_string(o)
end
end
end
def add_command(command, *options)
push "-#{command}"
if options.any?
options.each do |o|
push escape_string(o)
end
end
end
def escape_string(value)
Shellwords.escape(value.to_s)
end
def add_creation_operator(command, *options)
creation_command = command
if options.any?
options.each do |option|
creation_command << ":#{option}"
end
end
push creation_command
end
def push(arg)
@args << arg.to_s.strip
end
alias :<< :push
end
end