Class: Magick::ImageList

Inherits:
Object
  • Object
show all
Includes:
Comparable, Enumerable
Defined in:
lib/RMagick.rb,
ext/RMagick/rmmain.c

Overview

class Magick::Image

Defined Under Namespace

Classes: Montage

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*filenames, &block) ⇒ ImageList

Initialize new instances



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# File 'lib/RMagick.rb', line 1631

def initialize(*filenames, &block)
    @images = []
    @scene = nil
    filenames.each { |f|
        Magick::Image.read(f, &block).each { |n| @images << n }
        }
    if length > 0
        @scene = length - 1     # last image in array
    end
    self
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(methID, *args, &block) ⇒ Object

The ImageList class supports the Magick::Image class methods by simply sending the method to the current image. If the method isn’t explicitly supported, send it to the current image in the array. If there are no images, send it up the line. Catch a NameError and emit a useful message.



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# File 'lib/RMagick.rb', line 1698

def method_missing(methID, *args, &block)
    begin
        if @scene
            @images[@scene].send(methID, *args, &block)
        else
            super
        end
    rescue NoMethodError
      Kernel.raise NoMethodError, "undefined method `#{methID.id2name}' for #{self.class}"
    rescue Exception
        $@.delete_if { |s| /:in `send'$/.match(s) || /:in `method_missing'$/.match(s) }
        Kernel.raise
    end
end

Instance Attribute Details

#scene ⇒ Object

Returns the value of attribute scene.



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# File 'lib/RMagick.rb', line 1298

def scene
  @scene
end

Instance Method Details

#*(n) ⇒ Object 



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# File 'lib/RMagick.rb', line 1390

def *(n)
    unless n.kind_of? Integer
        Kernel.raise ArgumentError, "Integer required (#{n.class} given)"
    end
    current = get_current()
    ilist = self.class.new
    (@images * n).each {|image| ilist << image}
    ilist.set_current current
    return ilist
end

#<<(obj) ⇒ Object 



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# File 'lib/RMagick.rb', line 1401

def <<(obj)
    is_an_image obj
    @images << obj
    @scene = @images.length - 1
    self
end

#<=>(other) ⇒ Object

Compare ImageLists Compare each image in turn until the result of a comparison is not 0. If all comparisons return 0, then

return if A.scene != B.scene
return A.length <=> B.length



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# File 'lib/RMagick.rb', line 1413

def <=>(other)
    unless other.kind_of? self.class
       Kernel.raise TypeError, "#{self.class} required (#{other.class} given)"
    end
    size = [self.length, other.length].min
    size.times do |x|
        r = self[x] <=> other[x]
        return r unless r == 0
    end
    if @scene.nil? && other.scene.nil?
        return 0
    elsif @scene.nil? && ! other.scene.nil?
        Kernel.raise TypeError, "cannot convert nil into #{other.scene.class}"
    elsif ! @scene.nil? && other.scene.nil?
        Kernel.raise TypeError, "cannot convert nil into #{self.scene.class}"
    end
    r = self.scene <=> other.scene
    return r unless r == 0
    return self.length <=> other.length
end

#[](*args) ⇒ Object 



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# File 'lib/RMagick.rb', line 1434

def [](*args)
    a = @images[*args]
    if a.respond_to?(:each) then
        ilist = self.class.new
        a.each {|image| ilist << image}
        a = ilist
    end
    return a
end

#[]=(*args) ⇒ Object 



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# File 'lib/RMagick.rb', line 1444

def []=(*args)
    obj = @images.[]=(*args)
    if obj && obj.respond_to?(:each) then
        is_an_image_array(obj)
        set_current obj.last.__id__
    elsif obj
        is_an_image(obj)
        set_current obj.__id__
    else
        set_current nil
    end
    return obj
end

#__respond_to__? ⇒ Object

Ensure respond_to? answers correctly when we are delegating to Image



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# File 'lib/RMagick.rb', line 1798

alias_method :__respond_to__?, :respond_to?

#animate(*args) ⇒ Object

Method: ImageList#animate(<delay>) Purpose: repeatedly display the images in the images array to an XWindow

screen. The "delay" argument is the number of 1/100ths of a
second (0 to 65535) to delay between images.



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# File 'ext/RMagick/rmilist.c', line 30

VALUE
ImageList_animate(int argc, VALUE *argv, VALUE self)
{
    Image *images;
    Info *info;
    volatile VALUE info_obj;

    if (argc > 1)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
    }

    // Create a new Info object to use with this call
    info_obj = rm_info_new();

    // Convert the images array to an images sequence.
    images = images_from_imagelist(self);

    if (argc == 1)
    {
        Image *img;
        unsigned int delay;

        delay = NUM2UINT(argv[0]);
        for (img = images; img; img = GetNextImageInList(img))
        {
            img->delay = delay;
        }
    }

    Data_Get_Struct(info_obj, Info, info);
    (void) AnimateImages(info, images);
    rm_check_image_exception(images, RetainOnError);
    rm_split(images);

    return self;
}

#append(stack_arg) ⇒ Object

Method: ImageList#append(stack) Purpose: Append all the images by calling ImageAppend Returns: an Frame object for the result



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# File 'ext/RMagick/rmilist.c', line 74

VALUE
ImageList_append(VALUE self, VALUE stack_arg)
{
    Image *images, *new_image;
    unsigned int stack;
    ExceptionInfo exception;

    // Convert the image array to an image sequence.
    images = images_from_imagelist(self);

    // If stack == true, stack rectangular images top-to-bottom,
    // otherwise left-to-right.
    stack = RTEST(stack_arg);

    GetExceptionInfo(&exception);
    new_image = AppendImages(images, stack, &exception);
    rm_split(images);
    rm_check_exception(&exception, new_image, DestroyOnError);
    (void) DestroyExceptionInfo(&exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#average ⇒ Object

Method: ImageList#average Purpose: Average all images together by calling AverageImages Returns: an Frame object for the averaged image



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# File 'ext/RMagick/rmilist.c', line 105

VALUE
ImageList_average(VALUE self)
{
    Image *images, *new_image;
    ExceptionInfo exception;

    // Convert the images array to an images sequence.
    images = images_from_imagelist(self);

    GetExceptionInfo(&exception);
    new_image = AverageImages(images, &exception);
    rm_split(images);
    rm_check_exception(&exception, new_image, DestroyOnError);
    (void) DestroyExceptionInfo(&exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#clear ⇒ Object 



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# File 'lib/RMagick.rb', line 1475

def clear
    @scene = nil
    @images.clear
end

#clone ⇒ Object 



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# File 'lib/RMagick.rb', line 1480

def clone
    ditto = dup
    ditto.freeze if frozen?
    return ditto
end

#coalesce ⇒ Object

Method: ImageList#coalesce Purpose: call CoalesceImages Returns: a new Image with the coalesced image sequence

stored in the images array

Notes: respects the delay, matte, and start_loop fields

in each image.



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# File 'ext/RMagick/rmilist.c', line 134

VALUE
ImageList_coalesce(VALUE self)
{
    Image *images, *new_images;
    ExceptionInfo exception;

    // Convert the image array to an image sequence.
    images = images_from_imagelist(self);

    GetExceptionInfo(&exception);
    new_images = CoalesceImages(images, &exception);
    rm_split(images);
    rm_check_exception(&exception, new_images, DestroyOnError);
    (void) DestroyExceptionInfo(&exception);

    rm_ensure_result(new_images);

    return rm_imagelist_from_images(new_images);
}

#collect(&block) ⇒ Object Also known as: __map__

override Enumerable#collect



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# File 'lib/RMagick.rb', line 1487

def collect(&block)
    current = get_current()
    a = @images.collect(&block)
    ilist = self.class.new
    a.each {|image| ilist << image}
    ilist.set_current current
    return ilist
end

#collect!(&block) ⇒ Object Also known as: map!, __map__! 



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# File 'lib/RMagick.rb', line 1496

def collect!(&block)
    @images.collect!(&block)
    is_an_image_array @images
    self
end

#compact ⇒ Object 



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# File 'lib/RMagick.rb', line 1527

def compact
    current = get_current()
    ilist = self.class.new
    a = @images.compact
    a.each {|image| ilist << image}
    ilist.set_current current
    return ilist
end

#compact! ⇒ Object 



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# File 'lib/RMagick.rb', line 1536

def compact!
    current = get_current()
    a = @images.compact!    # returns nil if no changes were made
    set_current current
    return a.nil? ? nil : self
end

#composite_layers(*args) ⇒ Object

Method: ImageList#composite_layers Purpose: Equivalent to convert’s -layers composite option Notes: see mogrify.c



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# File 'ext/RMagick/rmilist.c', line 160

VALUE
ImageList_composite_layers(int argc, VALUE *argv, VALUE self)
{
    volatile VALUE source_images;
    Image *dest, *source, *new_images;
    RectangleInfo geometry;
    CompositeOperator operator = OverCompositeOp;
    ExceptionInfo exception;

    switch (argc)
    {
        case 2:
            VALUE_TO_ENUM(argv[1], operator, CompositeOperator);
        case 1:
            source_images = argv[0];
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (expected 1 or 2, got %d)", argc);
            break;
    }

    // Convert ImageLists to image sequences.
    dest = images_from_imagelist(self);
    new_images = clone_imagelist(dest);
    rm_split(dest);

    source = images_from_imagelist(source_images);

    SetGeometry(new_images,&geometry);
    (void) ParseAbsoluteGeometry(new_images->geometry, &geometry);

    geometry.width  = source->page.width != 0 ? source->page.width : source->columns;
    geometry.height = source->page.height != 0 ? source->page.height : source->rows;
    GravityAdjustGeometry(new_images->page.width  != 0 ? new_images->page.width  : new_images->columns
                        , new_images->page.height != 0 ? new_images->page.height : new_images->rows
                        , new_images->gravity, &geometry);

    GetExceptionInfo(&exception);
    CompositeLayers(new_images, operator, source, geometry.x, geometry.y, &exception);
    rm_split(source);
    rm_check_exception(&exception, new_images, DestroyOnError);
    (void) DestroyExceptionInfo(&exception);

    return rm_imagelist_from_images(new_images);
}

#concat(other) ⇒ Object 



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# File 'lib/RMagick.rb', line 1543

def concat(other)
    is_an_image_array other
    other.each {|image| @images << image}
    @scene = length-1
    return self
end

#copy ⇒ Object

Make a deep copy



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# File 'lib/RMagick.rb', line 1503

def copy
    ditto = self.class.new
    @images.each { |f| ditto << f.copy }
    ditto.scene = @scene
    ditto.taint if tainted?
    return ditto
end

#cur_image ⇒ Object

Return the current image



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# File 'lib/RMagick.rb', line 1512

def cur_image
    if ! @scene
        Kernel.raise IndexError, "no images in this list"
    end
    @images[@scene]
end

#deconstruct ⇒ Object

Method: ImageList#deconstruct Purpose: compares each image with the next in a sequence and returns

the maximum bounding region of any pixel differences it
discovers.

Returns: a new imagelist



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# File 'ext/RMagick/rmilist.c', line 214

VALUE
ImageList_deconstruct(VALUE self)
{
    Image *new_images, *images;
    ExceptionInfo exception;

    images = images_from_imagelist(self);
    GetExceptionInfo(&exception);
    new_images = DeconstructImages(images, &exception);
    rm_split(images);
    rm_check_exception(&exception, new_images, DestroyOnError);
    (void) DestroyExceptionInfo(&exception);

    rm_ensure_result(new_images);

    return rm_imagelist_from_images(new_images);
}

#delay=(d) ⇒ Object

Set same delay for all images



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# File 'lib/RMagick.rb', line 1551

def delay=(d)
    if Integer(d) < 0
        raise ArgumentError, "delay must be greater than or equal to 0"
    end
    @images.each { |f| f.delay = Integer(d) }
end

#delete(obj, &block) ⇒ Object 



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# File 'lib/RMagick.rb', line 1558

def delete(obj, &block)
    is_an_image obj
    current = get_current()
    a = @images.delete(obj, &block)
    set_current current
    return a
end

#delete_at(ndx) ⇒ Object 



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# File 'lib/RMagick.rb', line 1566

def delete_at(ndx)
    current = get_current()
    a = @images.delete_at(ndx)
    set_current current
    return a
end

#delete_if(&block) ⇒ Object 



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# File 'lib/RMagick.rb', line 1573

def delete_if(&block)
    current = get_current()
    @images.delete_if(&block)
    set_current current
    self
end

#display ⇒ Object Also known as: __display__

Method: ImageList#display Purpose: Display all the images to an X window screen.



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# File 'ext/RMagick/rmilist.c', line 237

VALUE
ImageList_display(VALUE self)
{
    Image *images;
    Info *info;
    volatile VALUE info_obj;

    // Create a new Info object to use with this call
    info_obj = rm_info_new();
    Data_Get_Struct(info_obj, Info, info);

    // Convert the images array to an images sequence.
    images = images_from_imagelist(self);

    (void) DisplayImages(info, images);
    rm_split(images);
    rm_check_image_exception(images, RetainOnError);

    return self;
}

#dup ⇒ Object 



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# File 'lib/RMagick.rb', line 1580

def dup
    ditto = self.class.new
    @images.each {|img| ditto << img}
    ditto.scene = @scene
    ditto.taint if tainted?
    return ditto
end

#eql?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/RMagick.rb', line 1588

def eql?(other)
  is_an_image_array other
  eql = other.eql?(@images)
  begin # "other" is another ImageList
    eql &&= @scene == other.scene
  rescue NoMethodError
    # "other" is a plain Array
  end
  return eql
end

#fill(*args, &block) ⇒ Object 



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# File 'lib/RMagick.rb', line 1599

def fill(*args, &block)
    is_an_image args[0] unless block_given?
    current = get_current()
    @images.fill(*args, &block)
    is_an_image_array self
    set_current current
    self
end

#find_all(&block) ⇒ Object Also known as: select

Override Enumerable’s find_all



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# File 'lib/RMagick.rb', line 1609

def find_all(&block)
    current = get_current()
    a = @images.find_all(&block)
    ilist = self.class.new
    a.each {|image| ilist << image}
    ilist.set_current current
    return ilist
end

#flatten_images ⇒ Object

Method: ImageList#flatten_images Purpose: merge all the images into a single image Returns: the new image Notes: Can’t use “flatten” because that’s an Array method



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# File 'ext/RMagick/rmilist.c', line 265

VALUE
ImageList_flatten_images(VALUE self)
{
    Image *images, *new_image;
    ExceptionInfo exception;

    images = images_from_imagelist(self);
    GetExceptionInfo(&exception);

#if defined(HAVE_ENUM_FLATTENLAYER)
    new_image = MergeImageLayers(images, FlattenLayer, &exception);
#else
    new_image = FlattenImages(images, &exception);
#endif

    rm_split(images);
    rm_check_exception(&exception, new_image, DestroyOnError);
    (void) DestroyExceptionInfo(&exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#from_blob(*blobs, &block) ⇒ Object 



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# File 'lib/RMagick.rb', line 1619

def from_blob(*blobs, &block)
    if (blobs.length == 0)
        Kernel.raise ArgumentError, "no blobs given"
    end
    blobs.each { |b|
        Magick::Image.from_blob(b, &block).each { |n| @images << n  }
        }
    @scene = length - 1
    self
end

#fx(*args) ⇒ Object

Method: ImageList#fx(expression[, channel…])



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# File 'ext/RMagick/rmilist.c', line 293

VALUE
ImageList_fx(int argc, VALUE *argv, VALUE self)
{
    Image *images, *new_image;
    char *expression;
    ChannelType channels;
    ExceptionInfo exception;


    channels = extract_channels(&argc, argv);

    // There must be exactly 1 remaining argument.
    if (argc == 0)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (0 for 1 or more)");
    }
    else if (argc > 1)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    expression = StringValuePtr(argv[0]);

    images = images_from_imagelist(self);
    GetExceptionInfo(&exception);
    new_image = FxImageChannel(images, channels, expression, &exception);
    rm_split(images);
    rm_check_exception(&exception, new_image, DestroyOnError);
    (void) DestroyExceptionInfo(&exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#insert(index, *args) ⇒ Object 



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# File 'lib/RMagick.rb', line 1643

def insert(index, *args)
    args.each {|image| is_an_image image}
    current = get_current()
    @images.insert(index, *args)
    set_current current
    return self
end

#inspect ⇒ Object

Call inspect for all the images



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# File 'lib/RMagick.rb', line 1652

def inspect
    img = []
    @images.each {|image| img << image.inspect }
    img = "[" + img.join(",\n") + "]\nscene=#{@scene}"
end

#iterations=(n) ⇒ Object

Set the number of iterations of an animated GIF



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# File 'lib/RMagick.rb', line 1659

def iterations=(n)
    n = Integer(n)
    if n < 0 || n > 65535
        Kernel.raise ArgumentError, "iterations must be between 0 and 65535"
    end
    @images.each {|f| f.iterations=n}
    self
end

#last(*args) ⇒ Object 



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# File 'lib/RMagick.rb', line 1668

def last(*args)
    if args.length == 0
      a = @images.last
    else
      a = @images.last(*args)
      ilist = self.class.new
      a.each {|img| ilist << img}
      @scene = a.length - 1
      a = ilist
    end
    return a
end

#map(*args) ⇒ Object

Method: ImageList#map(reference, dither=false) Purpose: Call MapImages Returns: a new ImageList with mapped images. @scene is set to self.scene



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# File 'ext/RMagick/rmilist.c', line 334

VALUE
ImageList_map(int argc, VALUE *argv, VALUE self)
{
    Image *images, *new_images = NULL;
    Image *map;
    unsigned int dither = MagickFalse;
    volatile VALUE scene, new_imagelist, t;
    ExceptionInfo exception;

#if defined(HAVE_REMAPIMAGES)
    rb_warning("ImageList#map is deprecated. Use ImageList#remap instead.");
#endif

    switch (argc)
    {
        case 2:
            dither = RTEST(argv[1]);
        case 1:
            t = rm_cur_image(argv[0]);
            map = rm_check_destroyed(t);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
            break;
    }


    // Convert image array to image sequence, clone image sequence.
    GetExceptionInfo(&exception);

    images = images_from_imagelist(self);
    new_images = CloneImageList(images, &exception);
    rm_split(images);
    rm_check_exception(&exception, new_images, DestroyOnError);
    (void) DestroyExceptionInfo(&exception);

    rm_ensure_result(new_images);

    // Call ImageMagick
    (void) MapImages(new_images, map, dither);
    rm_check_image_exception(new_images, DestroyOnError);

    // Set @scene in new ImageList object to same value as in self.
    new_imagelist = rm_imagelist_from_images(new_images);
    scene = rb_iv_get(self, "@scene");
    (void) imagelist_scene_eq(new_imagelist, scene);

    return new_imagelist;
}

#marshal_dump ⇒ Object

Custom marshal/unmarshal for Ruby 1.8.



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# File 'lib/RMagick.rb', line 1682

def marshal_dump()
   ary = [@scene]
   @images.each {|i| ary << Marshal.dump(i)}
   ary
end

#marshal_load(ary) ⇒ Object 



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# File 'lib/RMagick.rb', line 1688

def marshal_load(ary)
   @scene = ary.shift
   @images = []
   ary.each {|a| @images << Marshal.load(a)}
end

#montage ⇒ Object

Method: ImageList#montage <block> Purpose: Call MontageImages Notes: Creates Montage object, yields to block if present

in Montage object's scope.



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# File 'ext/RMagick/rmilist.c', line 391

VALUE
ImageList_montage(VALUE self)
{
    volatile VALUE montage_obj;
    Montage *montage;
    Image *new_images, *images;
    ExceptionInfo exception;

    // Create a new instance of the Magick::Montage class
    montage_obj = rm_montage_new();
    if (rb_block_given_p())
    {
        // Run the block in the instance's context, allowing the app to modify the
        // object's attributes.
        (void) rb_obj_instance_eval(0, NULL, montage_obj);
    }

    Data_Get_Struct(montage_obj, Montage, montage);

    images = images_from_imagelist(self);

    // If app specified a non-default composition operator, use it for all images.
    if (montage->compose != UndefinedCompositeOp)
    {
        Image *i;
        for (i = images; i; i = GetNextImageInList(i))
        {
            i->compose = montage->compose;
        }
    }

    GetExceptionInfo(&exception);

    // MontageImage can return more than one image.
    new_images = MontageImages(images, montage->info, &exception);
    rm_split(images);
    rm_check_exception(&exception, new_images, DestroyOnError);
    (void) DestroyExceptionInfo(&exception);

    rm_ensure_result(new_images);

    return rm_imagelist_from_images(new_images);
}

#morph(nimages) ⇒ Object

Method: ImageList#morph(number_images) Purpose: requires a minimum of two images. The first image is

transformed into the second by a number of intervening images
as specified by "number_images".

Returns: a new Image with the images array set to the morph sequence.

@scenes = 0



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# File 'ext/RMagick/rmilist.c', line 444

VALUE
ImageList_morph(VALUE self, VALUE nimages)
{
    Image *images, *new_images;
    ExceptionInfo exception;
    long number_images;


    // Use a signed long so we can test for a negative argument.
    number_images = NUM2LONG(nimages);
    if (number_images <= 0)
    {
        rb_raise(rb_eArgError, "number of intervening images must be > 0");
    }

    GetExceptionInfo(&exception);
    images = images_from_imagelist(self);
    new_images = MorphImages(images, (unsigned long)number_images, &exception);
    rm_split(images);
    rm_check_exception(&exception, new_images, DestroyOnError);
    (void) DestroyExceptionInfo(&exception);

    rm_ensure_result(new_images);

    return rm_imagelist_from_images(new_images);
}

#mosaic ⇒ Object

Method: ImageList#mosaic Purpose: merge all the images into a single image Returns: the new image



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# File 'ext/RMagick/rmilist.c', line 477

VALUE
ImageList_mosaic(VALUE self)
{
    Image *images, *new_image;
    ExceptionInfo exception;

    GetExceptionInfo(&exception);
    images = images_from_imagelist(self);

#if defined(HAVE_ENUM_MOSAICLAYER)
    new_image = MergeImageLayers(images, MosaicLayer, &exception);
#else
    new_image = MosaicImages(images, &exception);
#endif

    rm_split(images);
    rm_check_exception(&exception, new_image, DestroyOnError);
    (void) DestroyExceptionInfo(&exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#new_image(cols, rows, *fill, &info_blk) ⇒ Object

Create a new image and add it to the end



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# File 'lib/RMagick.rb', line 1714

def new_image(cols, rows, *fill, &info_blk)
    self << Magick::Image.new(cols, rows, *fill, &info_blk)
end

#nitems ⇒ Object 



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# File 'lib/RMagick.rb', line 1470

def nitems()
   @images.nitems()
end

#optimize_layers(method) ⇒ Object

Method: ImageList#optimize_layers Purpose: Equivalent to -layers option in 6.2.6 Returns: a new imagelist



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# File 'ext/RMagick/rmilist.c', line 507

VALUE
ImageList_optimize_layers(VALUE self, VALUE method)
{
    Image *images, *new_images, *new_images2;
    LAYERMETHODTYPE mthd;
    ExceptionInfo exception;
    QuantizeInfo quantize_info;

    new_images2 = NULL;     // defeat "unused variable" message

    GetExceptionInfo(&exception);
#if defined(HAVE_TYPE_IMAGELAYERMETHOD)
    VALUE_TO_ENUM(method, mthd, ImageLayerMethod);
#else
    VALUE_TO_ENUM(method, mthd, MagickLayerMethod);
#endif
    images = images_from_imagelist(self);

    switch (mthd)
    {
        case CoalesceLayer:
            new_images = CoalesceImages(images, &exception);
            break;
        case DisposeLayer:
            new_images = DisposeImages(images, &exception);
            break;
        case OptimizeTransLayer:
            new_images = clone_imagelist(images);
            OptimizeImageTransparency(new_images, &exception);
            break;
        case RemoveDupsLayer:
            new_images = clone_imagelist(images);
            RemoveDuplicateLayers(&new_images, &exception);
            break;
        case RemoveZeroLayer:
            new_images = clone_imagelist(images);
            RemoveZeroDelayLayers(&new_images, &exception);
            break;
        case CompositeLayer:
            rm_split(images);
            rb_raise(rb_eNotImpError, "Magick::CompositeLayer is not supported. Use the composite_layers method instead.");
            break;
            // In 6.3.4-ish, OptimizeImageLayer replaced OptimizeLayer
        case OptimizeImageLayer:
            new_images = OptimizeImageLayers(images, &exception);
            break;
            // and OptimizeLayer became a "General Purpose, GIF Animation Optimizer" (ref. mogrify.c)
        case OptimizeLayer:
            new_images = CoalesceImages(images, &exception);
            rm_split(images);
            rm_check_exception(&exception, new_images, DestroyOnError);
            new_images2 = OptimizeImageLayers(new_images, &exception);
            DestroyImageList(new_images);
            rm_check_exception(&exception, new_images2, DestroyOnError);
            new_images = new_images2;
            OptimizeImageTransparency(new_images, &exception);
            rm_check_exception(&exception, new_images, DestroyOnError);
            // mogrify supports -dither here. We don't.
#if defined(HAVE_REMAPIMAGE)
            GetQuantizeInfo(&quantize_info);
            (void) RemapImages(&quantize_info, new_images, NULL);
#else
            (void) MapImages(new_images, NULL, 0);
#endif
            break;
        case OptimizePlusLayer:
            new_images = OptimizePlusImageLayers(images, &exception);
            break;
        case CompareAnyLayer:
        case CompareClearLayer:
        case CompareOverlayLayer:
            new_images = CompareImageLayers(images, mthd, &exception);
            break;
#if defined(HAVE_ENUM_MOSAICLAYER)
        case MosaicLayer:
            new_images = MergeImageLayers(images, mthd, &exception);
            break;
#endif
#if defined(HAVE_ENUM_FLATTENLAYER)
        case FlattenLayer:
            new_images = MergeImageLayers(images, mthd, &exception);
            break;
#endif
#if defined(HAVE_ENUM_MERGELAYER)
        case MergeLayer:
            new_images = MergeImageLayers(images, mthd, &exception);
            break;
#endif
#if defined(HAVE_ENUM_TRIMBOUNDSLAYER)
        case TrimBoundsLayer:
            new_images = MergeImageLayers(images, mthd, &exception);
            break;
#endif
        default:
            rm_split(images);
            rb_raise(rb_eArgError, "undefined layer method");
            break;
    }

    rm_split(images);
    rm_check_exception(&exception, new_images, DestroyOnError);
    (void) DestroyExceptionInfo(&exception);

    rm_ensure_result(new_images);

    return rm_imagelist_from_images(new_images);
}

#partition(&block) ⇒ Object 



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# File 'lib/RMagick.rb', line 1718

def partition(&block)
  a = @images.partition(&block)
  t = self.class.new
  a[0].each { |img| t << img}
  t.set_current nil
  f = self.class.new
  a[1].each { |img| f << img}
  f.set_current nil
  [t, f]
end

#ping(*files, &block) ⇒ Object

Ping files and concatenate the new images



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# File 'lib/RMagick.rb', line 1730

def ping(*files, &block)
    if (files.length == 0)
        Kernel.raise ArgumentError, "no files given"
    end
    files.each { |f|
        Magick::Image.ping(f, &block).each { |n| @images << n }
        }
    @scene = length - 1
    self
end

#pop ⇒ Object 



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# File 'lib/RMagick.rb', line 1741

def pop
    current = get_current()
    a = @images.pop       # can return nil
    set_current current
    return a
end

#push(*objs) ⇒ Object 



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# File 'lib/RMagick.rb', line 1748

def push(*objs)
    objs.each do |image|
        is_an_image image
        @images << image
    end
    @scene = length - 1
    self
end

#quantize(*args) ⇒ Object

Method: ImageList#quantize(<number_colors<, colorspace<, dither<, tree_depth<, measure_error>>>>>)

defaults: 256, Magick::RGBColorspace, true, 0, false

Purpose: call QuantizeImages Returns: a new ImageList with quantized images. ‘scene’ is set to the same

value as self.scene



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# File 'ext/RMagick/rmilist.c', line 774

VALUE
ImageList_quantize(int argc, VALUE *argv, VALUE self)
{
    Image *images, *new_images;
    Image *new_image;
    QuantizeInfo quantize_info;
    ExceptionInfo exception;
    volatile VALUE new_imagelist, scene;

    GetQuantizeInfo(&quantize_info);

    switch (argc)
    {
        case 5:
            quantize_info.measure_error = (MagickBooleanType) RTEST(argv[4]);
        case 4:
            quantize_info.tree_depth = (unsigned long)NUM2INT(argv[3]);
        case 3:
#if defined(HAVE_TYPE_DITHERMETHOD) && defined(HAVE_ENUM_NODITHERMETHOD)
            if (rb_obj_is_kind_of(argv[2], Class_DitherMethod))
            {
                VALUE_TO_ENUM(argv[2], quantize_info.dither_method, DitherMethod);
                quantize_info.dither = quantize_info.dither_method != NoDitherMethod;
            }
#else
            quantize_info.dither = (MagickBooleanType) RTEST(argv[2]);
#endif
        case 2:
            VALUE_TO_ENUM(argv[1], quantize_info.colorspace, ColorspaceType);
        case 1:
            quantize_info.number_colors = NUM2ULONG(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 5)", argc);
            break;
    }


    // Convert image array to image sequence, clone image sequence.
    GetExceptionInfo(&exception);
    images = images_from_imagelist(self);
    new_images = CloneImageList(images, &exception);
    rm_split(images);
    rm_check_exception(&exception, new_images, DestroyOnError);
    (void) DestroyExceptionInfo(&exception);

    rm_ensure_result(new_images);


    (void) QuantizeImages(&quantize_info, new_images);
    rm_check_exception(&exception, new_images, DestroyOnError);

    // Create new ImageList object, convert mapped image sequence to images,
    // append to images array.
    new_imagelist = ImageList_new();
    while ((new_image = RemoveFirstImageFromList(&new_images)))
    {
        imagelist_push(new_imagelist, rm_image_new(new_image));
    }

    // Set @scene in new ImageList object to same value as in self.
    scene = rb_iv_get(self, "@scene");
    (void) rb_iv_set(new_imagelist, "@scene", scene);

    return new_imagelist;
}

#read(*files, &block) ⇒ Object

Read files and concatenate the new images



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# File 'lib/RMagick.rb', line 1758

def read(*files, &block)
    if (files.length == 0)
        Kernel.raise ArgumentError, "no files given"
    end
    files.each { |f|
        Magick::Image.read(f, &block).each { |n| @images << n }
        }
    @scene = length - 1
    self
end

#reject(&block) ⇒ Object

override Enumerable’s reject



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# File 'lib/RMagick.rb', line 1770

def reject(&block)
    current = get_current()
    ilist = self.class.new
    a = @images.reject(&block)
    a.each {|image| ilist << image}
    ilist.set_current current
    return ilist
end

#reject!(&block) ⇒ Object 



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# File 'lib/RMagick.rb', line 1779

def reject!(&block)
    current = get_current()
    a = @images.reject!(&block)
    @images = a if !a.nil?
    set_current current
    return a.nil? ? nil : self
end

#remap(*args) ⇒ Object Also known as: affinity

Method: ImageList#remap(remap_image=nil, dither_method=RiemersmaDitherMethod) Purpose: Call RemapImages Note: See Image_remap. Immediate - modifies images in-place



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# File 'ext/RMagick/rmilist.c', line 848

VALUE
ImageList_remap(int argc, VALUE *argv, VALUE self)
{
#if defined(HAVE_REMAPIMAGES) || defined(HAVE_AFFINITYIMAGES)
    Image *images, *remap_image = NULL;
    QuantizeInfo quantize_info;


    if (argc > 0 && argv[0] != Qnil)
    {
        volatile VALUE t = rm_cur_image(argv[0]);
        remap_image = rm_check_destroyed(t);
    }

    GetQuantizeInfo(&quantize_info);

    if (argc > 1)
    {
        VALUE_TO_ENUM(argv[1], quantize_info.dither_method, DitherMethod);
        quantize_info.dither = MagickTrue;
    }
    if (argc > 2)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
    }

    images = images_from_imagelist(self);

#if defined(HAVE_REMAPIMAGE)
    (void) RemapImages(&quantize_info, images, remap_image);
#else
    (void) AffinityImages(&quantize_info, images, remap_image);
#endif
    rm_check_image_exception(images, RetainOnError);
    rm_split(images);

    return self;
#else
    self = self;
    argc = argc;
    argv = argv;
    rm_not_implemented();
    return(VALUE)0;
#endif
}

#replace(other) ⇒ Object 



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# File 'lib/RMagick.rb', line 1787

def replace(other)
    is_an_image_array other
    current = get_current()
    @images.clear
    other.each {|image| @images << image}
    @scene = self.length == 0 ? nil : 0
    set_current current
    self
end

#respond_to?(methID, priv = false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/RMagick.rb', line 1799

def respond_to?(methID, priv=false)
    return true if __respond_to__?(methID, priv)
    if @scene
        @images[@scene].respond_to?(methID, priv)
    else
        super
    end
end

#reverse ⇒ Object 



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# File 'lib/RMagick.rb', line 1808

def reverse
    current = get_current()
    a = self.class.new
    @images.reverse_each {|image| a << image}
    a.set_current current
    return a
end

#reverse! ⇒ Object 



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# File 'lib/RMagick.rb', line 1816

def reverse!
    current = get_current()
    @images.reverse!
    set_current current
    self
end

#reverse_each ⇒ Object 



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# File 'lib/RMagick.rb', line 1823

def reverse_each
    @images.reverse_each {|image| yield(image)}
    self
end

#shift ⇒ Object 



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# File 'lib/RMagick.rb', line 1828

def shift
    current = get_current()
    a = @images.shift
    set_current current
    return a
end

#slice(*args) ⇒ Object 



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# File 'lib/RMagick.rb', line 1835

def slice(*args)
    current = get_current()
    slice = @images.slice(*args)
    if slice
        ilist = self.class.new
        if slice.respond_to?(:each) then
            slice.each {|image| ilist << image}
        else
            ilist << slice
        end
    else
        ilist = nil
    end
    return ilist
end

#slice!(*args) ⇒ Object 



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# File 'lib/RMagick.rb', line 1851

def slice!(*args)
    current = get_current()
    a = @images.slice!(*args)
    set_current current
    return a
end

#ticks_per_second=(t) ⇒ Object 



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# File 'lib/RMagick.rb', line 1858

def ticks_per_second=(t)
    if Integer(t) < 0
        Kernel.raise ArgumentError, "ticks_per_second must be greater than or equal to 0"
    end
    @images.each { |f| f.ticks_per_second = Integer(t) }
end

#to_a ⇒ Object 



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# File 'lib/RMagick.rb', line 1865

def to_a
    a = Array.new
    @images.each {|image| a << image}
    return a
end

#to_blob ⇒ Object

Method: ImageList#to_blob Purpose: returns the imagelist as a blob (a String) Notes: runs an info parm block if present - the user can

specify the image format and depth



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# File 'ext/RMagick/rmilist.c', line 901

VALUE
ImageList_to_blob(VALUE self)
{
    Image *images, *image;
    Info *info;
    volatile VALUE info_obj;
    volatile VALUE blob_str;
    void *blob = NULL;
    size_t length = 0;
    ExceptionInfo exception;

    info_obj = rm_info_new();
    Data_Get_Struct(info_obj, Info, info);

    // Convert the images array to an images sequence.
    images = images_from_imagelist(self);

    GetExceptionInfo(&exception);
    (void) SetImageInfo(info, MagickTrue, &exception);
    rm_check_exception(&exception, images, RetainOnError);

    if (*info->magick != '\0')
    {
        Image *img;
        for (img = images; img; img = GetNextImageInList(img))
        {
            strncpy(img->magick, info->magick, sizeof(info->magick)-1);
        }
    }

    for (image = images; image; image = GetNextImageInList(image))
    {
        rm_sync_image_options(image, info);
    }

    // Unconditionally request multi-images support. The worst that
    // can happen is that there's only one image or the format
    // doesn't support multi-image files.
    info->adjoin = MagickTrue;
    blob = ImagesToBlob(info, images, &length, &exception);
    if (blob && exception.severity >= ErrorException)
    {
        magick_free((void*)blob);
        blob = NULL;
        length = 0;
    }
    rm_split(images);
    CHECK_EXCEPTION()
    (void) DestroyExceptionInfo(&exception);


    if (length == 0 || !blob)
    {
        return Qnil;
    }

    blob_str = rb_str_new(blob, (long)length);
    magick_free((void*)blob);

    return blob_str;
}

#uniq ⇒ Object 



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# File 'lib/RMagick.rb', line 1871

def uniq
    current = get_current()
    a = self.class.new
    @images.uniq.each {|image| a << image}
    a.set_current current
    return a
end

#uniq!(*args) ⇒ Object 



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# File 'lib/RMagick.rb', line 1879

def uniq!(*args)
    current = get_current()
    a = @images.uniq!
    set_current current
    return a.nil? ? nil : self
end

#unshift(obj) ⇒ Object 



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# File 'lib/RMagick.rb', line 1887

def unshift(obj)
    is_an_image obj
    @images.unshift(obj)
    @scene = 0
    self
end

#values_at(*args) ⇒ Object Also known as: indexes, indices 



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# File 'lib/RMagick.rb', line 1894

def values_at(*args)
    a = @images.values_at(*args)
    a = self.class.new
    @images.values_at(*args).each {|image| a << image}
    a.scene = a.length - 1
    return a
end

#write(file) ⇒ Object

Method: ImageList#write(file) Purpose: Write all the images to the specified file. If the file format

supports multi-image files, and the @images array contains more
than one image, then the images will be written as a single
multi-image file. Otherwise each image will be written to a
separate file. Returns self.



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# File 'ext/RMagick/rmilist.c', line 972

VALUE
ImageList_write(VALUE self, VALUE file)
{
    Image *images, *img;
    Info *info;
    const MagickInfo *m;
    volatile VALUE info_obj;
    unsigned long scene;
    ExceptionInfo exception;

    info_obj = rm_info_new();
    Data_Get_Struct(info_obj, Info, info);


    if (TYPE(file) == T_FILE)
    {
        OpenFile *fptr;

        // Ensure file is open - raise error if not
        GetOpenFile(file, fptr);
        SetImageInfoFile(info, GetReadFile(fptr));
    }
    else
    {
        add_format_prefix(info, file);
        SetImageInfoFile(info, NULL);
    }

    // Convert the images array to an images sequence.
    images = images_from_imagelist(self);

    // Copy the filename into each image. Set a scene number to be used if
    // writing multiple files. (Ref: ImageMagick's utilities/convert.c
    for (scene = 0, img = images; img; img = GetNextImageInList(img))
    {
        img->scene = scene++;
        strcpy(img->filename, info->filename);
    }

    // Find out if the format supports multi-images files.
    GetExceptionInfo(&exception);
    (void) SetImageInfo(info, MagickTrue, &exception);
    rm_check_exception(&exception, images, RetainOnError);

    m = GetMagickInfo(info->magick, &exception);
    rm_check_exception(&exception, images, RetainOnError);
    (void) DestroyExceptionInfo(&exception);

    // Tell WriteImage if we want a multi-images file.
    if (imagelist_length(self) > 1L && m->adjoin)
    {
        info->adjoin = MagickTrue;
    }

    for (img = images; img; img = GetNextImageInList(img))
    {
        rm_sync_image_options(img, info);
        (void) WriteImage(info, img);
        // images will be split before raising an exception
        rm_check_image_exception(images, RetainOnError);
        if (info->adjoin)
        {
            break;
        }
    }

    rm_split(images);
    return self;
}