Class: Magick::ImageList

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

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_internal.rb', line 1551

def initialize(*filenames, &block)
  @images = []
  @scene = nil
  filenames.each do |f|
    Magick::Image.read(f, &block).each { |n| @images << n }
  end

  @scene = length - 1 if length > 0 # last image in array
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(meth_id, *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_internal.rb', line 1612

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

Instance Attribute Details

#scene ⇒ Object

Returns the value of attribute scene.



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# File 'lib/rmagick_internal.rb', line 1239

def scene
  @scene
end

Instance Method Details

#*(other) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1316

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

#<<(obj) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1325

def <<(obj)
  assert_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_internal.rb', line 1337

def <=>(other)
  return unless other.is_a? self.class

  size = [length, other.length].min
  size.times do |x|
    r = self[x] <=> other[x]
    return r unless r.zero?
  end

  return 0 if @scene.nil? && other.scene.nil?
  return if @scene.nil? && !other.scene.nil?
  return if !@scene.nil? && other.scene.nil?

  r = scene <=> other.scene
  return r unless r.zero?

  length <=> other.length
end

#[](*args) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1356

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

#[]=(*args) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1366

def []=(*args)
  obj = @images.[]=(*args)
  if obj.respond_to?(:each)
    assert_image_array(obj)
    set_current obj.last.__id__
  elsif obj
    assert_image(obj)
    set_current obj.__id__
  else
    set_current nil
  end
end

#__respond_to__? ⇒ Object

Ensure respond_to? answers correctly when we are delegating to Image



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# File 'lib/rmagick_internal.rb', line 1708

alias __respond_to__? respond_to?

#animate ⇒ Magick::ImageList #animate(delay) {|info| ... } ⇒ Magick::ImageList

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.

Overloads:

  • #animate(delay) {|info| ... } ⇒ Magick::ImageList

    Parameters:

    • delay (Numeric) —

      the length of time between each image in an animation

    Yields:

    • (info)

    Yield Parameters:

Returns:



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# File 'ext/RMagick/rmilist.cpp', line 73

VALUE
ImageList_animate(int argc, VALUE *argv, VALUE self)
{
    Image *images;
    Info *info;
    VALUE info_obj;
    unsigned int delay;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    if (argc == 1)
    {
        delay = NUM2UINT(argv[0]);
    }
    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;

        for (img = images; img; img = GetNextImageInList(img))
        {
            img->delay = delay;
        }
    }

    TypedData_Get_Struct(info_obj, Info, &rm_info_data_type, info);
#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(AnimateImages) args = { info, images, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(AnimateImages), &args);
    rm_split(images);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(AnimateImages) args = { info, images };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(AnimateImages), &args);
    rm_split(images);
    rm_check_image_exception(images, RetainOnError);
#endif

    RB_GC_GUARD(info_obj);

    return self;
}

#append(stack_arg) ⇒ Magick::Image

Append all the images

Parameters:

Returns:



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# File 'ext/RMagick/rmilist.cpp', line 136

VALUE
ImageList_append(VALUE self, VALUE stack_arg)
{
    Image *images, *new_image;
    MagickBooleanType 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 = (MagickBooleanType)RTEST(stack_arg);

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(AppendImages) args = { images, stack, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(AppendImages), &args);
    rm_split(images);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#average ⇒ Magick::Image

Average all images together

Returns:



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# File 'ext/RMagick/rmilist.cpp', line 166

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

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

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(EvaluateImages) args = { images, MeanEvaluateOperator, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(EvaluateImages), &args);
    rm_split(images);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#clear ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1396

def clear
  @scene = nil
  @images.clear
end

#clone ⇒ Object 



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

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

#coalesce ⇒ Magick::ImageList

Composites a set of images while respecting any page offsets and disposal methods.

  • Respects the delay, matte, and start_loop fields in each image.

Returns:

  • (Magick::ImageList) —

    a new image with the coalesced image sequence return stored in the images array



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# File 'ext/RMagick/rmilist.cpp', line 194

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

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

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(CoalesceImages) args = { images, exception };
    new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CoalesceImages), &args);
    rm_split(images);
    rm_check_exception(exception, new_images, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_imagelist_from_images(new_images);
}

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

override Enumerable#collect



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# File 'lib/rmagick_internal.rb', line 1408

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

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



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# File 'lib/rmagick_internal.rb', line 1417

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

#combine ⇒ Magick::Image #combine(colorspace) ⇒ Magick::Image

Combines the images using the specified colorspace.

Overloads:

  • #combine(colorspace) ⇒ Magick::Image

    Parameters:

    • colorspace (Magick::ColorspaceType) —

      the colorspace

Returns:



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# File 'ext/RMagick/rmilist.cpp', line 224

VALUE ImageList_combine(int argc, VALUE *argv, VALUE self)
{
#if defined(IMAGEMAGICK_6)
    ChannelType channel;
    ColorspaceType old_colorspace;
#endif
    ColorspaceType colorspace;
    long len;
    Image *images, *new_image;
    ExceptionInfo *exception;

    len = check_imagelist_length(self);

    switch (argc)
    {
        case 1:
            VALUE_TO_ENUM(argv[0], colorspace, ColorspaceType);
            break;
        case 0:
            colorspace = sRGBColorspace;
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (expected 1, got %d)", argc);
            break;
    }

#if defined(IMAGEMAGICK_7)
    if (len > 5)
    {
        rb_raise(rb_eArgError, "invalid number of images in this image list");
    }
    if (len == 5 && colorspace != CMYKColorspace)
    {
        rb_raise(rb_eArgError, "invalid number of images in this image list");
    }
#else
    channel = RedChannel;
    switch (len)
    {
        case 5:
            if (colorspace == CMYKColorspace)
                channel = (ChannelType)(channel | AlphaChannel);
            else
                rb_raise(rb_eArgError, "invalid number of images in this image list");
        case 4:
            if (colorspace == CMYKColorspace)
                channel = (ChannelType)(channel | IndexChannel);
            else
                channel = (ChannelType)(channel | AlphaChannel);
        case 3:
            channel = (ChannelType)(channel | GreenChannel);
            channel = (ChannelType)(channel | BlueChannel);
            break;
        case 2:
            channel = (ChannelType)(channel | AlphaChannel);
            break;
        case 1:
            break;
        default:
            rb_raise(rb_eArgError, "invalid number of images in this image list");
            break;
    }
#endif

    images = images_from_imagelist(self);
    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_6)
    old_colorspace = images->colorspace;
    SetImageColorspace(images, colorspace);
    GVL_STRUCT_TYPE(CombineImages) args = { images, channel, exception };
#else
    GVL_STRUCT_TYPE(CombineImages) args = { images, colorspace, exception };
#endif
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CombineImages), &args);

    rm_split(images);
#if defined(IMAGEMAGICK_6)
    images->colorspace = old_colorspace;
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}

#compact ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1446

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

#compact! ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1455

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

#composite_layers(images) ⇒ Magick::ImageList #composite_layers(images, composite_op) ⇒ Magick::ImageList

An image from source images is composited over an image from receiver’s list until one list is finished.

Overloads:

Returns:



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# File 'ext/RMagick/rmilist.cpp', line 323

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

    switch (argc)
    {
        case 2:
            VALUE_TO_ENUM(argv[1], composite_op, 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);
    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);

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(CompositeLayers) args = { new_images, composite_op, source, geometry.x, geometry.y, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CompositeLayers), &args);
    rm_split(source);
    rm_check_exception(exception, new_images, DestroyOnError);
    DestroyExceptionInfo(exception);

    RB_GC_GUARD(source_images);

    return rm_imagelist_from_images(new_images);
}

#concat(other) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1462

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

#copy ⇒ Object

Make a deep copy



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# File 'lib/rmagick_internal.rb', line 1424

def copy
  ditto = self.class.new
  @images.each { |f| ditto << f.copy }
  ditto.scene = @scene
  ditto
end

#cur_image ⇒ Object

Return the current image



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# File 'lib/rmagick_internal.rb', line 1432

def cur_image
  Kernel.raise IndexError, 'no images in this list' unless @scene
  @images[@scene]
end

#deconstruct ⇒ Magick::ImageList

Compare each image with the next in a sequence and returns the maximum bounding region of any pixel differences it discovers.

Returns:



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# File 'ext/RMagick/rmilist.cpp', line 379

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

    images = images_from_imagelist(self);
    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(CompareImagesLayers) args = { images, CompareAnyLayer, exception };
    new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CompareImagesLayers), &args);
#else
    GVL_STRUCT_TYPE(DeconstructImages) args = { images, exception };
    new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(DeconstructImages), &args);
#endif
    rm_split(images);
    rm_check_exception(exception, new_images, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_imagelist_from_images(new_images);
}

#delay=(d) ⇒ Object

Set same delay for all images

Raises:

  • (ArgumentError) 


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

def delay=(d)
  raise ArgumentError, 'delay must be greater than or equal to 0' if Integer(d) < 0

  @images.each { |f| f.delay = Integer(d) }
end

#delete(obj, &block) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1476

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

#delete_at(ndx) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1484

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

#delete_if(&block) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1491

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

#destroy! ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1809

def destroy!
  @images.each(&:destroy!)
  self
end

#destroyed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rmagick_internal.rb', line 1814

def destroyed?
  @images.all?(&:destroyed?)
end

#display {|info| ... } ⇒ Magick::ImageList Also known as: __display__

Display all the images to an X window screen.

Yields:

  • (info)

Yield Parameters:

Returns:



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# File 'ext/RMagick/rmilist.cpp', line 409

VALUE
ImageList_display(VALUE self)
{
    Image *images;
    Info *info;
    VALUE info_obj;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

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

    // Convert the images array to an images sequence.
    images = images_from_imagelist(self);
#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    DisplayImages(info, images, exception);
    rm_split(images);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    DisplayImages(info, images);
    rm_split(images);
    rm_check_image_exception(images, RetainOnError);
#endif

    RB_GC_GUARD(info_obj);

    return self;
}

#dup ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1498

def dup
  ditto = self.class.new
  @images.each { |img| ditto << img }
  ditto.scene = @scene
  ditto
end

#eql?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rmagick_internal.rb', line 1505

def eql?(other)
  begin
    assert_image_array other
  rescue ArgumentError
    return false
  end

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

#fill(*args, &block) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1521

def fill(*args, &block)
  assert_image args[0] unless block
  current = get_current
  @images.fill(*args, &block)
  assert_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_internal.rb', line 1531

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

#flatten_images ⇒ Magick::ImageList

Merge all the images into a single image.

Returns:



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# File 'ext/RMagick/rmilist.cpp', line 448

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

    images = images_from_imagelist(self);
    exception = AcquireExceptionInfo();

    GVL_STRUCT_TYPE(MergeImageLayers) args = { images, FlattenLayer, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(MergeImageLayers), &args);

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

    return rm_image_new(new_image);
}

#from_blob(*blobs, &block) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1541

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

#insert(index, *args) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1561

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

#inspect ⇒ Object

Call inspect for all the images



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# File 'lib/rmagick_internal.rb', line 1570

def inspect
  img = @images.map(&:inspect)
  '[' + 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_internal.rb', line 1576

def iterations=(n)
  n = Integer(n)
  Kernel.raise ArgumentError, 'iterations must be between 0 and 65535' if n < 0 || n > 65_535
  @images.each { |f| f.iterations = n }
end

#last(*args) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1582

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

#marshal_dump ⇒ Object

Custom marshal/unmarshal for Ruby 1.8.



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# File 'lib/rmagick_internal.rb', line 1596

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_internal.rb', line 1602

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

#montage ⇒ Magick::ImageList #montage {|opt| ... } ⇒ Magick::ImageList

Tile one or more thumbnails across an image canvas.

Overloads:

Returns:



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# File 'ext/RMagick/rmilist.cpp', line 481

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

    // Create a new instance of the Magick::ImageList::Montage class
    montage_obj = rm_montage_new();
    if (rb_block_given_p())
    {
        rb_yield(montage_obj);
    }

    TypedData_Get_Struct(montage_obj, Montage, &rm_montage_data_type, montage);

    images = images_from_imagelist(self);

    for (Image *image = images; image; image = GetNextImageInList(image))
    {
        if (montage->compose != UndefinedCompositeOp)
        {
            image->compose = montage->compose;
        }
        image->background_color = montage->info->background_color;
        image->border_color = montage->info->border_color;
        image->matte_color = montage->info->matte_color;
        image->gravity = montage->info->gravity;
    }

    exception = AcquireExceptionInfo();

    // MontageImage can return more than one image.
    GVL_STRUCT_TYPE(MontageImages) args = { images, montage->info, exception };
    new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(MontageImages), &args);
    rm_split(images);
    rm_check_exception(exception, new_images, DestroyOnError);
    DestroyExceptionInfo(exception);

    RB_GC_GUARD(montage_obj);

    return rm_imagelist_from_images(new_images);
}

#morph(nimages) ⇒ Magick::ImageList

Note:

Sets @scenes to 0

Requires a minimum of two images. The first image is transformed into the second by a number of intervening images as specified by “nimages”.

Parameters:

  • nimages (Numeric) —

    the number of images

Returns:

  • (Magick::ImageList) —

    a new image list with the images array set to the morph sequence.



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# File 'ext/RMagick/rmilist.cpp', line 535

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


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

    number_images = NUM2LONG(nimages);
    images = images_from_imagelist(self);
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(MorphImages) args = { images, number_images, exception };
    new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(MorphImages), &args);
    rm_split(images);
    rm_check_exception(exception, new_images, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_imagelist_from_images(new_images);
}

#mosaic ⇒ Magick::Image

Merge all the images into a single image.

Returns:



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# File 'ext/RMagick/rmilist.cpp', line 567

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

    images = images_from_imagelist(self);

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(MergeImageLayers) args = { images, MosaicLayer, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(MergeImageLayers), &args);

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

    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_internal.rb', line 1628

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

#optimize_layers(method) ⇒ Magick::ImageList

Optimizes or compares the images in the list. Equivalent to the -layers option in ImageMagick’s mogrify command.

Parameters:

  • method (Magick::LayerMethod) —

    the method to use

Returns:



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# File 'ext/RMagick/rmilist.cpp', line 594

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

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

    VALUE_TO_ENUM(method, mthd, LayerMethod);
    images = images_from_imagelist(self);

    exception = AcquireExceptionInfo();
    switch (mthd)
    {
        case CoalesceLayer:
            {
                GVL_STRUCT_TYPE(CoalesceImages) args = { images, exception };
                new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CoalesceImages), &args);
            }
            break;
        case DisposeLayer:
            {
                GVL_STRUCT_TYPE(DisposeImages) args = { images, exception };
                new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(DisposeImages), &args);
            }
            break;
        case OptimizeTransLayer:
            {
                new_images = clone_imagelist(images);
                GVL_STRUCT_TYPE(OptimizeImageTransparency) args = { new_images, exception };
                CALL_FUNC_WITHOUT_GVL(GVL_FUNC(OptimizeImageTransparency), &args);
            }
            break;
        case RemoveDupsLayer:
            {
                new_images = clone_imagelist(images);
                GVL_STRUCT_TYPE(RemoveDuplicateLayers) args = { &new_images, exception };
                CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RemoveDuplicateLayers), &args);
            }
            break;
        case RemoveZeroLayer:
            {
                new_images = clone_imagelist(images);
                GVL_STRUCT_TYPE(RemoveZeroDelayLayers) args = { &new_images, exception };
                CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RemoveZeroDelayLayers), &args);
            }
            break;
        case CompositeLayer:
            rm_split(images);
            DestroyExceptionInfo(exception);
            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:
            {
                GVL_STRUCT_TYPE(OptimizeImageLayers) args = { images, exception };
                new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(OptimizeImageLayers), &args);
            }
            break;
            // and OptimizeLayer became a "General Purpose, GIF Animation Optimizer" (ref. mogrify.c)
        case OptimizeLayer:
            {
                GVL_STRUCT_TYPE(CoalesceImages) args_CoalesceImages = { images, exception };
                new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CoalesceImages), &args_CoalesceImages);
                rm_split(images);
                rm_check_exception(exception, new_images, DestroyOnError);

                GVL_STRUCT_TYPE(OptimizeImageLayers) args_OptimizeImageLayers = { new_images, exception };
                new_images2 = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(OptimizeImageLayers), &args_OptimizeImageLayers);
                DestroyImageList(new_images);
                rm_check_exception(exception, new_images2, DestroyOnError);

                new_images = new_images2;
                GVL_STRUCT_TYPE(OptimizeImageTransparency) args_OptimizeImageTransparency = { new_images, exception };
                CALL_FUNC_WITHOUT_GVL(GVL_FUNC(OptimizeImageTransparency), &args_OptimizeImageTransparency);
                rm_check_exception(exception, new_images, DestroyOnError);
                // mogrify supports -dither here. We don't.
                GetQuantizeInfo(&quantize_info);
#if defined(IMAGEMAGICK_7)
                GVL_STRUCT_TYPE(RemapImages) args_RemapImages = { &quantize_info, new_images, NULL, exception };
#else
                GVL_STRUCT_TYPE(RemapImages) args_RemapImages = { &quantize_info, new_images, NULL };
#endif
                CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RemapImages), &args_RemapImages);

            }
            break;
        case OptimizePlusLayer:
            {
                GVL_STRUCT_TYPE(OptimizePlusImageLayers) args = { images, exception };
                new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(OptimizePlusImageLayers), &args);
            }
            break;
        case CompareAnyLayer:
        case CompareClearLayer:
        case CompareOverlayLayer:
            {
#if defined(IMAGEMAGICK_7)
                GVL_STRUCT_TYPE(CompareImagesLayers) args = { images, mthd, exception };
                new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CompareImagesLayers), &args);
#else
                GVL_STRUCT_TYPE(CompareImageLayers) args = { images, mthd, exception };
                new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CompareImageLayers), &args);
#endif
            }
            break;
        case MosaicLayer:
            {
                GVL_STRUCT_TYPE(MergeImageLayers) args = { images, mthd, exception };
                new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(MergeImageLayers), &args);
            }
            break;
        case FlattenLayer:
            {
                GVL_STRUCT_TYPE(MergeImageLayers) args = { images, mthd, exception };
                new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(MergeImageLayers), &args);
            }
            break;
        case MergeLayer:
            {
                GVL_STRUCT_TYPE(MergeImageLayers) args = { images, mthd, exception };
                new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(MergeImageLayers), &args);
            }
            break;
        case TrimBoundsLayer:
            {
                GVL_STRUCT_TYPE(MergeImageLayers) args = { images, mthd, exception };
                new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(MergeImageLayers), &args);
            }
            break;
        default:
            rm_split(images);
            DestroyExceptionInfo(exception);
            rb_raise(rb_eArgError, "undefined layer method");
            break;
    }

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

    return rm_imagelist_from_images(new_images);
}

#partition(&block) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1632

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_internal.rb', line 1644

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

#pop ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1653

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

#push(*objs) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1660

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

#quantize(number_colors = 256, colorspace = Magick::RGBColorsapce, dither = true, tree_depth = 0, measure_error = false) ⇒ Magick::ImageList

Analyzes the colors within a set of reference images and chooses a fixed number of colors to represent the set. The goal of the algorithm is to minimize the difference between the input and output images while minimizing the processing time.

Note:

Sets @scene to the same value as self.scene

Returns a new ImageList with quantized images.

Parameters:

  • number_colors (Numeric) (defaults to: 256) —

    the maximum number of colors to use in the output images.

  • colorspace (Magick::ColorspaceType) (defaults to: Magick::RGBColorsapce) —

    the colorspace to quantize in.

  • dither (Magick::DitherMethod, Boolean) (defaults to: true) —

    a DitherMethod value or true if you want apply dither.

  • tree_depth (Numeric) (defaults to: 0) —

    specify the tree depth to use while quantizing.

  • measure_error (Boolean) (defaults to: false) —

    calculate quantization errors when quantizing the image.

Returns:



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# File 'ext/RMagick/rmilist.cpp', line 947

VALUE
ImageList_quantize(int argc, VALUE *argv, VALUE self)
{
    Image *images, *new_images;
    Image *new_image;
    QuantizeInfo quantize_info;
    ExceptionInfo *exception;
    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(IMAGEMAGICK_7)
            if (rb_obj_is_kind_of(argv[2], Class_DitherMethod))
            {
                VALUE_TO_ENUM(argv[2], quantize_info.dither_method, DitherMethod);
            }
            else
            {
                quantize_info.dither_method = RTEST(argv[2]) ? UndefinedDitherMethod : NoDitherMethod;
            }
#else
            if (rb_obj_is_kind_of(argv[2], Class_DitherMethod))
            {
                VALUE_TO_ENUM(argv[2], quantize_info.dither_method, DitherMethod);
                quantize_info.dither = (MagickBooleanType)(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.
    images = images_from_imagelist(self);
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(CloneImageList) args_CloneImageList = { images, exception };
    new_images = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(CloneImageList), &args_CloneImageList);
    rm_split(images);
    rm_check_exception(exception, new_images, DestroyOnError);

    rm_ensure_result(new_images);

#if defined(IMAGEMAGICK_7)
    GVL_STRUCT_TYPE(QuantizeImages) args_QuantizeImages = { &quantize_info, new_images, exception };
#else
    GVL_STRUCT_TYPE(QuantizeImages) args_QuantizeImages = { &quantize_info, new_images };
#endif
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(QuantizeImages), &args_QuantizeImages);
    rm_check_exception(exception, new_images, DestroyOnError);
    DestroyExceptionInfo(exception);

    // 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");
    rb_iv_set(new_imagelist, "@scene", scene);

    RB_GC_GUARD(new_imagelist);
    RB_GC_GUARD(scene);

    return new_imagelist;
}

#read(*files, &block) ⇒ Object

Read files and concatenate the new images



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# File 'lib/rmagick_internal.rb', line 1670

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

#reject(&block) ⇒ Object

override Enumerable’s reject



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# File 'lib/rmagick_internal.rb', line 1680

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

#reject!(&block) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1689

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

#remap(remap_image = nil, dither_method = Magick::RiemersmaDitherMethod) ⇒ Magick::ImageList Also known as: affinity

Reduce the colors used in the image list to the set of colors in remap_image.

Note:

Modifies images in-place.

Returns self.

Parameters:

  • remap_image (Magick::Image, Magick::ImageList) (defaults to: nil) —

    Either an imagelist or an image. If an imagelist, uses the current image.

  • dither_method (Magick::DitherMethod) (defaults to: Magick::RiemersmaDitherMethod) —

    a DitherMethod value.

Returns:



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# File 'ext/RMagick/rmilist.cpp', line 1045

VALUE
ImageList_remap(int argc, VALUE *argv, VALUE self)
{
    Image *images, *remap_image = NULL;
    QuantizeInfo quantize_info;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

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

    GetQuantizeInfo(&quantize_info);

    if (argc > 1)
    {
        VALUE_TO_ENUM(argv[1], quantize_info.dither_method, DitherMethod);
#if defined(IMAGEMAGICK_6)
        quantize_info.dither = MagickTrue;
#endif
    }
    if (argc > 2)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
    }

    images = images_from_imagelist(self);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(RemapImages) args = { &quantize_info, images, remap_image, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RemapImages), &args);
    rm_split(images);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(RemapImages) args = { &quantize_info, images, remap_image };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(RemapImages), &args);
    rm_split(images);
    rm_check_image_exception(images, RetainOnError);
#endif

    return self;
}

#replace(other) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1697

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

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

Returns:

  • (Boolean) 


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# File 'lib/rmagick_internal.rb', line 1709

def respond_to?(meth_id, priv = false)
  return true if __respond_to__?(meth_id, priv)

  if @scene
    @images[@scene].respond_to?(meth_id, priv)
  else
    super
  end
end

#reverse ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1719

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

#reverse! ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1727

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

#reverse_each(&block) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1734

def reverse_each(&block)
  @images.reverse_each(&block)
  self
end

#shift ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1739

def shift
  current = get_current
  a = @images.shift
  set_current current
  a
end

#slice(*args) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1746

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

#slice!(*args) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1761

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

#sort!(*args, &block) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1391

def sort!(*args, &block)
  @images.sort!(*args, &block)
  self
end

#ticks_per_second=(t) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1768

def ticks_per_second=(t)
  Kernel.raise ArgumentError, 'ticks_per_second must be greater than or equal to 0' if Integer(t) < 0
  @images.each { |f| f.ticks_per_second = Integer(t) }
end

#to_a ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1773

def to_a
  @images.map { |image| image }
end

#to_blob ⇒ String #to_blob {|info| ... } ⇒ String

Return the imagelist as a blob (a String).

Overloads:

  • #to_blob {|info| ... } ⇒ String

    Runs an info parm block if present - the user can specify the image format and depth

    Yields:

    • (info)

    Yield Parameters:

Returns:

  • (String) —

    the blob



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# File 'ext/RMagick/rmilist.cpp', line 1107

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

    info_obj = rm_info_new();
    TypedData_Get_Struct(info_obj, Info, &rm_info_data_type, info);

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

    exception = AcquireExceptionInfo();
    SetImageInfo(info, MagickTrue, exception);
    rm_check_exception(exception, images, RetainOnError);

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

    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;
    GVL_STRUCT_TYPE(ImagesToBlob) args = { info, images, &length, exception };
    blob = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(ImagesToBlob), &args);
    if (blob && exception->severity >= ErrorException)
    {
        magick_free((void*)blob);
        blob = NULL;
        length = 0;
    }
    rm_split(images);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);


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

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

    RB_GC_GUARD(info_obj);
    RB_GC_GUARD(blob_str);

    return blob_str;
}

#uniq ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1777

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

#uniq!(*_args) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1785

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

#unshift(obj) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1793

def unshift(obj)
  assert_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_internal.rb', line 1800

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

#write(file) {|info| ... } ⇒ Object

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.

Parameters:

  • file (File, String) —

    the file

Yields:

  • (info)

Yield Parameters:



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# File 'ext/RMagick/rmilist.cpp', line 1184

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

    info_obj = rm_info_new();
    TypedData_Get_Struct(info_obj, Info, &rm_info_data_type, info);


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

        // Ensure file is open - raise error if not
        GetOpenFile(file, fptr);
        rb_io_check_writable(fptr);

        add_format_prefix(info, rm_io_path(file));
#if defined(_WIN32)
        SetImageInfoFile(info, NULL);
#else
        SetImageInfoFile(info, rb_io_stdio_file(fptr));
#endif
    }
    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++;
        strlcpy(img->filename, info->filename, sizeof(img->filename));
    }

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

    m = GetMagickInfo(info->magick, exception);
    rm_check_exception(exception, images, RetainOnError);
#if defined(IMAGEMAGICK_6)
    DestroyExceptionInfo(exception);
#endif

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

    for (img = images; img; img = GetNextImageInList(img))
    {
        rm_sync_image_options(img, info);
#if defined(IMAGEMAGICK_7)
        GVL_STRUCT_TYPE(WriteImage) args = { info, img, exception };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(WriteImage), &args);
        rm_check_exception(exception, img, RetainOnError);
#else
        GVL_STRUCT_TYPE(WriteImage) args = { info, img };
        CALL_FUNC_WITHOUT_GVL(GVL_FUNC(WriteImage), &args);
        // images will be split before raising an exception
        rm_check_image_exception(images, RetainOnError);
#endif
        if (info->adjoin)
        {
            break;
        }
    }

#if defined(IMAGEMAGICK_7)
    DestroyExceptionInfo(exception);
#endif

    rm_split(images);

    RB_GC_GUARD(info_obj);

    return self;
}