minimagick/lib/mini_magick/image.rb at master · lest/minimagick

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require 'tempfile'

require 'stringio'

require 'pathname'

require 'uri'

require 'open-uri'

require 'mini_magick/image/info'

require 'mini_magick/utilities'

module MiniMagick

class Image

# 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 #read(size) or be a

# binary string object (BLOBBBB)

# Probably easier to use the {.open} method if you want to open a file or a

# URL.

# @param stream [#read, 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 [MiniMagick::Image]

def self.read(stream, ext = nil)

if stream.is_a?(String)

stream = StringIO.new(stream)

end

create(ext) { |file| IO.copy_stream(stream, file) }

end

# Creates an image object from a binary string blob which contains raw

# pixel data (i.e. no header data).

# @param blob [String] Binary string blob containing raw pixel data.

# @param columns [Integer] Number of columns.

# @param rows [Integer] Number of rows.

# @param depth [Integer] Bit depth of the encoded pixel data.

# @param map [String] A code for the mapping of the pixel data. Example:

# 'gray' or 'rgb'.

# @param format [String] The file extension of the image format to be

# used when creating the image object.

# Defaults to 'png'.

# @return [MiniMagick::Image] The loaded image.

def self.import_pixels(blob, columns, rows, depth, map, format = 'png')

# Create an image object with the raw pixel data string:

create(".dat", false) { |f| f.write(blob) }.tap do |image|

output_path = image.path.sub(/\.\w+$/, ".#{format}")

# Use ImageMagick to convert the raw data file to an image file of the

# desired format:

MiniMagick::Tool::Convert.new do |convert|

convert.size "#{columns}x#{rows}"

convert.depth depth

convert << "#{map}:#{image.path}"

convert << output_path

end

image.path.replace output_path

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.

# @param path_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 [MiniMagick::Image] The loaded image

def self.open(path_or_url, ext = nil)

ext ||=

if File.exist?(path_or_url)

File.extname(path_or_url)

else

File.extname(URI(path_or_url).path)

end

Kernel.open(path_or_url, "rb") do |file|

read(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 [Tempfile] You can #write bits to this object to create the new

# Image

# @return [MiniMagick::Image] The created image

def self.create(ext = nil, validate = MiniMagick.validate_on_create, &block)

tempfile = MiniMagick::Utilities.tempfile(ext.to_s.downcase, &block)

new(tempfile.path, tempfile).tap do |image|

image.validate! if validate

end

# @private

# @!macro [attach] attribute

# @!attribute [r] $1

def self.attribute(name, key = name.to_s)

define_method(name) do |*args|

if args.any? && name != :resolution

mogrify { |b| b.send(name, *args) }

else

@info[key, *args]

end

# @return [String] The location of the current working file

attr_reader :path

# @return [Tempfile] The underlying temporary file

attr_reader :tempfile

# 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 {.open}

# which creates a temporary file for you and protects your original.

# @param input_path [String, Pathname] The location of an image file

# @yield [MiniMagick::Tool::Mogrify] If block is given, {#combine_options}

# is called.

def initialize(input_path, tempfile = nil, &block)

@path = input_path.to_s

@tempfile = tempfile

@info = MiniMagick::Image::Info.new(@path)

combine_options(&block) if block

end

def ==(other)

self.class == other.class && signature == other.signature

end

alias eql? ==

def hash

signature.hash

end

# Returns raw image data.

# @return [String] Binary string

def to_blob

File.binread(path)

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?

validate!

true

rescue MiniMagick::Invalid

false

end

# Runs `identify` on the current image, and raises an error if it doesn't

# pass.

# @raise [MiniMagick::Invalid]

def validate!

identify

rescue MiniMagick::Error => error

raise MiniMagick::Invalid, error.message

end

# Returns the image format (e.g. "JPEG", "GIF").

# @return [String]

attribute :type, "format"

# @return [String]

attribute :mime_type

# @return [Integer]

attribute :width

# @return [Integer]

attribute :height

# @return [Array<Integer>]

attribute :dimensions

# Returns the file size of the image (in bytes).

# @return [Integer]

attribute :size

# Returns the file size in a human readable format.

# @return [String]

attribute :human_size

# @return [String]

attribute :colorspace

# @return [Hash]

attribute :exif

# Returns the resolution of the photo. You can optionally specify the

# units measurement.

# @example

# image.resolution("PixelsPerInch") #=> [250, 250]

# @see http://www.imagemagick.org/script/command-line-options.php#units

# @return [Array<Integer>]

attribute :resolution

# Returns the message digest of this image as a SHA-256, hexidecimal

# encoded string. This signature uniquely identifies the image and is

# convenient for determining if an image has been modified or whether two

# images are identical.

# @example

# image.signature #=> "60a7848c4ca6e36b8e2c5dea632ecdc29e9637791d2c59ebf7a54c0c6a74ef7e"

# @see http://www.imagemagick.org/api/signature.php

# @return [String]

attribute :signature

# Returns the information from `identify -verbose` in a Hash format, for

# ImageMagick.

# @return [Hash]

attribute :data

# Returns the information from `identify -verbose` in a Hash format, for

# GraphicsMagick.

# @return [Hash]

attribute :details

# Use this method if you want to access raw Identify's format API.

# @example

# image["%w %h"] #=> "250 450"

# image["%r"] #=> "DirectClass sRGB"

# @param value [String]

# @see http://www.imagemagick.org/script/escape.php

# @return [String]

def [](value)

@info[value.to_s]

end

alias info []

# Returns layers of the image. For example, JPEGs are 1-layered, but

# formats like PSDs, GIFs and PDFs can have multiple layers/frames/pages.

# @example

# image = MiniMagick::Image.new("document.pdf")

# image.pages.each_with_index do |page, idx|

# page.write("page#{idx}.pdf")

# end

# @return [Array<MiniMagick::Image>]

def layers

layers_count = identify.lines.count

layers_count.times.map do |idx|

MiniMagick::Image.new("#{path}[#{idx}]")

end

alias pages layers

alias frames layers

# 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.

# @param read_opts [Hash] Any read options to be passed to ImageMagick

# for example: image.format('jpg', page, {density: '300'})

# @yield [MiniMagick::Tool::Convert] It optionally yields the command,

# if you want to add something.

# @return [self]

def format(format, page = 0, read_opts={})

if @tempfile

new_tempfile = MiniMagick::Utilities.tempfile(".#{format}")

new_path = new_tempfile.path

else

new_path = Pathname(path).sub_ext(".#{format}").to_s

end

input_path = path.dup

input_path << "[#{page}]" if page && !layer?

MiniMagick::Tool::Convert.new do |convert|

read_opts.each do |opt, val|

convert.send(opt.to_s, val)

end

convert << input_path

yield convert if block_given?

convert << new_path

end

if @tempfile

destroy!

@tempfile = new_tempfile

else

File.delete(path) unless path == new_path || layer?

end

path.replace new_path

@info.clear

self

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 "blue"

# end

# @yield [MiniMagick::Tool::Mogrify]

# @see http://www.imagemagick.org/script/mogrify.php

# @return [self]

def combine_options(&block)

mogrify(&block)

end

# If an unknown method is called then it is sent through the mogrify

# program.

# @see http://www.imagemagick.org/script/mogrify.php

# @return [self]

def method_missing(name, *args)

mogrify do |builder|

builder.send(name, *args)

end

def respond_to_missing?(method_name, include_private = false)

MiniMagick::Tool::Mogrify.option_methods.include?(method_name.to_s)

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 [String, Pathname, #read] Some kind of stream object

# that needs to be read or a file path as a String

def write(output_to)

case output_to

when String, Pathname

if layer?

MiniMagick::Tool::Convert.new do |builder|

builder << path

builder << output_to

end

else

FileUtils.copy_file path, output_to unless path == output_to.to_s

end

else

IO.copy_stream File.open(path, "rb"), output_to

end

# @example

# first_image = MiniMagick::Image.open "first.jpg"

# second_image = MiniMagick::Image.open "second.jpg"

# result = first_image.composite(second_image) do |c|

# c.compose "Over" # OverCompositeOp

# c.geometry "+20+20" # copy second_image onto first_image from (20, 20)

# end

# result.write "output.jpg"

# @see http://www.imagemagick.org/script/composite.php

def composite(other_image, output_extension = type.downcase, mask = nil)

output_tempfile = MiniMagick::Utilities.tempfile(".#{output_extension}")

MiniMagick::Tool::Composite.new do |composite|

yield composite if block_given?

composite << other_image.path

composite << path

composite << mask.path if mask

composite << output_tempfile.path

end

Image.new(output_tempfile.path, output_tempfile)

end

# Collapse images with sequences to the first frame (i.e. animated gifs) and

# preserve quality.

# @param frame [Integer] The frame to which to collapse to, defaults to `0`.

# @return [self]

def collapse!(frame = 0)

mogrify(frame) { |builder| builder.quality(100) }

end

# Destroys the tempfile (created by {.open}) if it exists.

def destroy!

if @tempfile

FileUtils.rm_f @tempfile.path.sub(/mpc$/, "cache") if @tempfile.path.end_with?(".mpc")

@tempfile.unlink

end

# Runs `identify` on itself. Accepts an optional block for adding more

# options to `identify`.

# @example

# image = MiniMagick::Image.open("image.jpg")

# image.identify do |b|

# b.verbose

# end # runs `identify -verbose image.jpg`

# @return [String] Output from `identify`

# @yield [MiniMagick::Tool::Identify]

def identify

MiniMagick::Tool::Identify.new do |builder|

yield builder if block_given?

builder << path

end

# @private

def run_command(tool_name, *args)

MiniMagick::Tool.const_get(tool_name.capitalize).new do |builder|

args.each do |arg|

builder << arg

end

def mogrify(page = nil)

MiniMagick::Tool::Mogrify.new do |builder|

builder.instance_eval do

def format(*args)

fail NoMethodError,

"you must call #format on a MiniMagick::Image directly"

end

yield builder if block_given?

builder << (page ? "#{path}[#{page}]" : path)

end

@info.clear

self

end

def layer?

path =~ /\[\d+\]$/

end

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