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mini_magick.rb
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mini_magick.rb
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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