Class: MiniMagick::Image
- Inherits:
-
Object
- Object
- MiniMagick::Image
- Defined in:
- lib/mini_magick.rb
Instance Attribute Summary collapse
-
#output ⇒ Object
readonly
Returns the value of attribute output.
-
#path ⇒ Object
readonly
Returns the value of attribute path.
-
#tempfile ⇒ Object
readonly
Returns the value of attribute tempfile.
Class Method Summary collapse
- .from_blob(blob, ext = nil) ⇒ Object
-
.open(image_path) ⇒ Object
(also: from_file)
Use this if you don’t want to overwrite the image file.
Instance Method Summary collapse
-
#<<(*args) ⇒ Object
Sends raw commands to imagemagick’s mogrify command.
-
#[](value) ⇒ Object
For reference see www.imagemagick.org/script/command-line-options.php#format.
-
#collapse! ⇒ Object
Collapse images with sequences to the first frame (ie. animated gifs) and preserve quality.
-
#combine_options(&block) ⇒ Object
You can use multiple commands together using this method.
-
#format(format, page = 0) ⇒ Object
This is a ‘special’ command because it needs to change @path to reflect the new extension Formatting an animation into a non-animated type will result in ImageMagick creating multiple pages (starting with 0).
-
#format_option(format) ⇒ Object
Outputs a carriage-return delimited format string for Unix and Windows.
-
#initialize(input_path, tempfile = nil) ⇒ Image
constructor
Instance Methods —————-.
-
#method_missing(symbol, *args) ⇒ Object
If an unknown method is called then it is sent through the morgrify program Look here to find all the commands (www.imagemagick.org/script/mogrify.php).
- #run_command(command, *args) ⇒ Object
-
#to_blob ⇒ Object
Give you raw data back.
-
#windows? ⇒ Boolean
Check to see if we are running on win32 – we need to escape things differently.
-
#write(output_path) ⇒ Object
Writes the temporary image that we are using for processing to the output path.
Constructor Details
#initialize(input_path, tempfile = nil) ⇒ Image
Instance Methods
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# File 'lib/mini_magick.rb', line 45 def initialize(input_path, tempfile=nil) @path = input_path @tempfile = tempfile # ensures that the tempfile will stick around until this image is garbage collected. # Ensure that the file is an image run_command("identify", @path) end |
Dynamic Method Handling
This class handles dynamic methods through the method_missing method
#method_missing(symbol, *args) ⇒ Object
If an unknown method is called then it is sent through the morgrify program Look here to find all the commands (www.imagemagick.org/script/mogrify.php)
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# File 'lib/mini_magick.rb', line 129 def method_missing(symbol, *args) args.push(@path) # push the path onto the end run_command("mogrify", "-#{symbol}", *args) self end |
Instance Attribute Details
#output ⇒ Object (readonly)
Returns the value of attribute output.
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# File 'lib/mini_magick.rb', line 17 def output @output end |
#path ⇒ Object (readonly)
Returns the value of attribute path.
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# File 'lib/mini_magick.rb', line 15 def path @path end |
#tempfile ⇒ Object (readonly)
Returns the value of attribute tempfile.
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# File 'lib/mini_magick.rb', line 16 def tempfile @tempfile end |
Class Method Details
.from_blob(blob, ext = nil) ⇒ Object
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# File 'lib/mini_magick.rb', line 22 def from_blob(blob, ext = nil) begin tempfile = Tempfile.new(['mini_magick', ext.to_s]) tempfile.binmode tempfile.write(blob) ensure tempfile.close if tempfile end return self.new(tempfile.path, tempfile) end |
.open(image_path) ⇒ Object Also known as: from_file
Use this if you don’t want to overwrite the image file
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# File 'lib/mini_magick.rb', line 35 def open(image_path) File.open(image_path, "rb") do |f| self.from_blob(f.read, File.extname(image_path)) end end |
Instance Method Details
#<<(*args) ⇒ Object
Sends raw commands to imagemagick’s mogrify command. The image path is automatically appended to the command
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# File 'lib/mini_magick.rb', line 78 def <<(*args) run_command("mogrify", *args << @path) end |
#[](value) ⇒ Object
For reference see www.imagemagick.org/script/command-line-options.php#format
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# File 'lib/mini_magick.rb', line 54 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 "format" run_command("identify", "-format", format_option("%m"), @path).split("\n")[0] when "height" run_command("identify", "-format", format_option("%h"), @path).split("\n")[0].to_i when "width" run_command("identify", "-format", format_option("%w"), @path).split("\n")[0].to_i when "dimensions" run_command("identify", "-format", format_option("%w %h"), @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 run_command('identify', '-format', "\"%[#{value}]\"", @path).chop else run_command('identify', '-format', "\"#{value}\"", @path).split("\n")[0] end end |
#collapse! ⇒ Object
Collapse images with sequences to the first frame (ie. animated gifs) and preserve quality
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# File 'lib/mini_magick.rb', line 108 def collapse! run_command("mogrify", "-quality", "100", "#{path}[0]") end |
#combine_options(&block) ⇒ Object
You can use multiple commands together using this method
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# File 'lib/mini_magick.rb', line 136 def (&block) c = CommandBuilder.new block.call c run_command("mogrify", *c.args << @path) end |
#format(format, page = 0) ⇒ Object
This is a ‘special’ command because it needs to change @path to reflect the new extension 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.
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# File 'lib/mini_magick.rb', line 86 def format(format, page=0) run_command("mogrify", "-format", format, @path) old_path = @path.dup @path.sub!(/(\.\w+)?$/, ".#{format}") File.delete(old_path) unless old_path == @path unless File.exists?(@path) begin FileUtils.copy_file(@path.sub(".#{format}", "-#{page}.#{format}"), @path) rescue e raise MiniMagickError, "Unable to format to #{format}; #{e}" unless File.exist?(@path) end end ensure Dir[@path.sub(/(\.\w+)?$/, "-[0-9]*.#{format}")].each do |fname| File.unlink(fname) end end |
#format_option(format) ⇒ Object
Outputs a carriage-return delimited format string for Unix and Windows
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# File 'lib/mini_magick.rb', line 148 def format_option(format) windows? ? "#{format}\\n" : "#{format}\\\\n" end |
#run_command(command, *args) ⇒ Object
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# File 'lib/mini_magick.rb', line 152 def run_command(command, *args) args.collect! do |arg| # args can contain characters like '>' so we must escape them, but don't quote switches if arg !~ /^[\+\-]/ "\"#{arg}\"" else arg.to_s end end command = "#{MiniMagick.processor} #{command} #{args.join(' ')}".strip $stderr.puts "=====> #{command}" output = `#{command} 2>&1` if $?.exitstatus != 0 raise MiniMagickError, "ImageMagick command (#{command.inspect}) failed: #{{:status_code => $?, :output => output}.inspect}" else output end end |
#to_blob ⇒ Object
Give you raw data back
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# File 'lib/mini_magick.rb', line 119 def to_blob f = File.new @path f.binmode f.read ensure f.close if f end |
#windows? ⇒ Boolean
Check to see if we are running on win32 – we need to escape things differently
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# File 'lib/mini_magick.rb', line 143 def windows? !(RUBY_PLATFORM =~ /win32/).nil? end |
#write(output_path) ⇒ Object
Writes the temporary image that we are using for processing to the output path
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# File 'lib/mini_magick.rb', line 113 def write(output_path) FileUtils.copy_file @path, output_path run_command "identify", output_path # Verify that we have a good image end |