Class: Magick::ImageList

Inherits:
Object
  • Object
show all
Includes:
Comparable, Enumerable
Defined in:
lib/rmagick_internal.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_internal.rb', line 1550

def initialize(*filenames, &block)
  @images = []
  @scene = nil
  filenames.each do |f|
    Magick::Image.read(f, &block).each { |n| @images << n }
  end
  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(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 1615

def method_missing(meth_id, *args, &block)
  if @scene
    @images[@scene].send(meth_id, *args, &block)
  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 1241

def scene
  @scene
end

Instance Method Details

#*(other) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1327

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 1336

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_internal.rb', line 1348

def <=>(other)
  Kernel.raise TypeError, "#{self.class} required (#{other.class} given)" 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?

  Kernel.raise TypeError, "cannot convert nil into #{other.scene.class}" if @scene.nil? && !other.scene.nil?
  Kernel.raise TypeError, "cannot convert nil into #{scene.class}" 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 1365

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 1375

def []=(*args)
  obj = @images.[]=(*args)
  if obj && obj.respond_to?(:each)
    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
  obj
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 1709

alias __respond_to__? respond_to?

#animate(*args) ⇒ Object

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.

Ruby usage:

- @verbatim ImageList#animate @endverbatim
- @verbatim ImageList#animate(delay) @endverbatim

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object

Returns:

  • self



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# File 'ext/RMagick/rmilist.c', line 42

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

    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;
        }
    }

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

    RB_GC_GUARD(info_obj);

    return self;
}

#append(stack_arg) ⇒ Object

Append all the images by calling ImageAppend.

Ruby usage:

- @verbatim ImageList#append(stack) @endverbatim

Parameters:

  • self —

    this object

  • stack_arg —

    the stack of images

Returns:

  • a Frame object for the result



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# File 'ext/RMagick/rmilist.c', line 96

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);

    exception = AcquireExceptionInfo();
    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

Average all images together by calling AverageImages.

Ruby usage:

- @verbatim ImageList#average @endverbatim

Parameters:

  • self —

    this object

Returns:

  • a Frame object for the averaged image



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# File 'ext/RMagick/rmilist.c', line 131

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();
    new_image = EvaluateImages(images, MeanEvaluateOperator, 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_internal.rb', line 1399

def clear
  @scene = nil
  @images.clear
end

#clone ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1404

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

#coalesce ⇒ Object

Call CoalesceImages.

Ruby usage:

- @verbatim ImageList#coalesce @endverbatim

Notes:

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

images array

Parameters:

  • self —

    this object

Returns:

  • a new Image with the coalesced image sequence return stored in the



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

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();
    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_internal.rb', line 1411

def collect(&block)
  current = get_current
  a = @images.collect(&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 1420

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

#combine(*args) ⇒ Object

Combines the images using the specified colorspace.

Ruby usage:

- @verbatim new_image = ImageList#combine @endverbatim
- @verbatim new_image = ImageList#combine(colorspace) @endverbatim

Notes:

- Calls CombineImages.

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object

Returns:

  • a new image



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# File 'ext/RMagick/rmilist.c', line 202

VALUE ImageList_combine(int argc, VALUE *argv, VALUE self)
{
    ChannelType channel;
    ColorspaceType colorspace, old_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;
    }

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

    images = images_from_imagelist(self);
    old_colorspace = images->colorspace;
    SetImageColorspace(images, colorspace);

    exception = AcquireExceptionInfo();
    new_image = CombineImages(images, channel, exception);
    rm_split(images);
    images->colorspace = old_colorspace;
    rm_check_exception(exception, new_image, DestroyOnError);
    (void) DestroyExceptionInfo(exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}

#compact ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1449

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 1458

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(*args) ⇒ Object

Equivalent to convert’s -layers composite option.

Ruby usage:

- @verbatim ImageList#composite_layers(images) @endverbatim
- @verbatim ImageList#composite_layers(images,operator) @endverbatim

Notes:

- Default operator is OverCompositeOp

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object

Returns:

  • a new imagelist

See Also:

  • in ImageMagick


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# File 'ext/RMagick/rmilist.c', line 285

VALUE
ImageList_composite_layers(int argc, VALUE *argv, VALUE self)
{
    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);

    exception = AcquireExceptionInfo();
    CompositeLayers(new_images, operator, source, geometry.x, geometry.y, exception);
    rm_split(source);
    rm_check_exception(exception, new_images, DestroyOnError);
    (void) 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 1465

def concat(other)
  is_an_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 1427

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

#cur_image ⇒ Object

Return the current image



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# File 'lib/rmagick_internal.rb', line 1436

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

#deconstruct ⇒ Object

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

Ruby usage:

- @verbatim ImageList#deconstruct @endverbatim

Parameters:

  • self —

    this object

Returns:

  • a new imagelist



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# File 'ext/RMagick/rmilist.c', line 344

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

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

Raises:

  • (ArgumentError) 


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# File 'lib/rmagick_internal.rb', line 1473

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 1479

def delete(obj, &block)
  is_an_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 1487

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 1494

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

#display ⇒ Object Also known as: __display__

Display all the images to an X window screen.

Ruby usage:

- @verbatim ImageList#display @endverbatim

Parameters:

  • self —

    this object

Returns:

  • self



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# File 'ext/RMagick/rmilist.c', line 372

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

    RB_GC_GUARD(info_obj);

    return self;
}

#dup ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1501

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

#eql?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rmagick_internal.rb', line 1509

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
  eql
end

#fill(*args, &block) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1520

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_internal.rb', line 1530

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
  ilist
end

#flatten_images ⇒ Object

Merge all the images into a single image.

Ruby usage:

- @verbatim ImageList#flatten_images @endverbatim

Notes:

- Can't use "flatten" because that's an Array method

Parameters:

  • self —

    this object

Returns:

  • the new image



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# File 'ext/RMagick/rmilist.c', line 408

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

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

    new_image = MergeImageLayers(images, FlattenLayer, 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);
}

#from_blob(*blobs, &block) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1540

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

#fx(*args) ⇒ Object

Deprecated.

This method has been deprecated. Please use Image_fx.

Apply fx on the images.

Ruby usage:

- @verbatim ImageList#fx(expression) @endverbatim
- @verbatim ImageList#fx(expression, channel) @endverbatim
- @verbatim ImageList#fx(expression, channel, ...) @endverbatim

Notes:

- Default channel is AllChannels

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object

Returns:

  • a new image



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# File 'ext/RMagick/rmilist.c', line 446

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

    rb_warning("ImageList#fx is deprecated; use Image#fx");

    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);
    exception = AcquireExceptionInfo();
    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_internal.rb', line 1562

def insert(index, *args)
  args.each { |image| is_an_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 1571

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_internal.rb', line 1578

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 }
  self
end

#last(*args) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1585

def last(*args)
  if args.length.zero?
    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

#map(*args) ⇒ Object

Call MapImages.

Ruby usage:

- @verbatim ImageList#map(reference) @endverbatim
- @verbatim ImageList#map(reference, dither) @endverbatim

Notes:

- Default dither is false
- Sets \@scene to self.scene

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object

Returns:

  • a new ImageList with mapped images.



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# File 'ext/RMagick/rmilist.c', line 499

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

    QuantizeInfo quantize_info;
    rb_warning("ImageList#map is deprecated. Use ImageList#remap instead.");

    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.
    images = images_from_imagelist(self);

    exception = AcquireExceptionInfo();
    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
    GetQuantizeInfo(&quantize_info);
    quantize_info.dither = dither;
    (void) RemapImages(&quantize_info, new_images, map);
    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);

    RB_GC_GUARD(scene);
    RB_GC_GUARD(new_imagelist);
    RB_GC_GUARD(t);

    return new_imagelist;
}

#marshal_dump ⇒ Object

Custom marshal/unmarshal for Ruby 1.8.



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

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 1605

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

#montage ⇒ Object

Call MontageImages.

Ruby usage:

- @verbatim ImageList#montage <{parm block}> @endverbatim

Notes:

- Creates Montage object, yields to block if present in Montage object's
  scope.

Parameters:

  • self —

    this object

Returns:

  • a new image list



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# File 'ext/RMagick/rmilist.c', line 568

VALUE
ImageList_montage(VALUE self)
{
    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);

    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.
    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);

    RB_GC_GUARD(montage_obj);

    return rm_imagelist_from_images(new_images);
}

#morph(nimages) ⇒ Object

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”.

Ruby usage:

- @verbatim ImageList#morph(number_images) @endverbatim

Notes:

- Sets \@scenes to 0

Parameters:

  • self —

    this object

  • nimages —

    the number of images

Returns:

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



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# File 'ext/RMagick/rmilist.c', line 631

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");
    }

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

Merge all the images into a single image.

Ruby usage:

- @verbatim ImageList#mosaic @endverbatim

Parameters:

  • self —

    this object

Returns:

  • the new image



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# File 'ext/RMagick/rmilist.c', line 668

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

    images = images_from_imagelist(self);

    exception = AcquireExceptionInfo();
    new_image = MergeImageLayers(images, MosaicLayer, 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);
}

#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 1629

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

#optimize_layers(method) ⇒ Object

Equivalent to -layers option in ImageMagick 6.2.6.

Ruby usage:

- @verbatim ImageList#optimize_layers(method) @endverbatim

Parameters:

  • self —

    this object

  • method —

    the method to use

Returns:

  • a new imagelist



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# File 'ext/RMagick/rmilist.c', line 699

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:
            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);
            (void) 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:
            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.
            GetQuantizeInfo(&quantize_info);
            (void) RemapImages(&quantize_info, new_images, NULL);
            break;
        case OptimizePlusLayer:
            new_images = OptimizePlusImageLayers(images, exception);
            break;
        case CompareAnyLayer:
        case CompareClearLayer:
        case CompareOverlayLayer:
            new_images = CompareImageLayers(images, mthd, exception);
            break;
        case MosaicLayer:
            new_images = MergeImageLayers(images, mthd, exception);
            break;
        case FlattenLayer:
            new_images = MergeImageLayers(images, mthd, exception);
            break;
        case MergeLayer:
            new_images = MergeImageLayers(images, mthd, exception);
            break;
        case TrimBoundsLayer:
            new_images = MergeImageLayers(images, mthd, exception);
            break;
        default:
            rm_split(images);
            (void) DestroyExceptionInfo(exception);
            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_internal.rb', line 1633

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 1645

def ping(*files, &block)
  Kernel.raise ArgumentError, 'no files given' if files.length.zero?
  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 1654

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 1661

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

#quantize(*args) ⇒ Object

Call QuantizeImages.

Ruby usage:

- @verbatim ImageList#quantize @endverbatim
- @verbatim ImageList#quantize(number_colors) @endverbatim
- @verbatim ImageList#quantize(number_colors, colorspace) @endverbatim
- @verbatim ImageList#quantize(number_colors, colorspace, dither) @endverbatim
- @verbatim ImageList#quantize(number_colors, colorspace, dither, tree_depth) @endverbatim
- @verbatim ImageList#quantize(number_colors, colorspace, dither, tree_depth, measure_error) @endverbatim

Notes:

- Default number_colors is 256
- Default coorspace is Magick::RGBColorsapce
- Default dither is true
- Default tree_depth is 0
- Default measure_error is false
- Sets \@scene to the same value as self.scene

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object

Returns:

  • a new ImageList with quantized images



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# File 'ext/RMagick/rmilist.c', line 1025

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 (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]);
            }
        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();
    new_images = CloneImageList(images, exception);
    rm_split(images);
    rm_check_exception(exception, new_images, DestroyOnError);

    rm_ensure_result(new_images);


    (void) QuantizeImages(&quantize_info, new_images);
    rm_check_exception(exception, new_images, DestroyOnError);
    (void) 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");
    (void) 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 1671

def read(*files, &block)
  Kernel.raise ArgumentError, 'no files given' if files.length.zero?
  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 1681

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 1690

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

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

Call RemapImages.

Ruby usage:

- @verbatim ImageList#remap @endverbatim
- @verbatim ImageList#remap(remap_image) @endverbatim
- @verbatim ImageList#remap(remap_image, dither_method) @endverbatim

Notes:

- Default remap_image is nil
- Default dither_method is RiemersmaDitherMethod
- Modifies images in-place.

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object

See Also:

  • Image_remap


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# File 'ext/RMagick/rmilist.c', line 1115

VALUE
ImageList_remap(int argc, VALUE *argv, VALUE self)
{
    Image *images, *remap_image = NULL;
    QuantizeInfo quantize_info;


    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);
        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);

    (void) RemapImages(&quantize_info, images, remap_image);
    rm_check_image_exception(images, RetainOnError);
    rm_split(images);

    return self;
}

#replace(other) ⇒ Object 



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

def replace(other)
  is_an_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 1710

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 1720

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 1728

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

#reverse_each ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1735

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

#shift ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1740

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 1747

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 1762

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

#ticks_per_second=(t) ⇒ Object 



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# File 'lib/rmagick_internal.rb', line 1769

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 1774

def to_a
  a = []
  @images.each { |image| a << image }
  a
end

#to_blob ⇒ Object

Return the imagelist as a blob (a String).

Ruby usage:

- @verbatim ImageList#to_blob @endverbatim

Notes:

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

Parameters:

  • self —

    this object

Returns:

  • the blob



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# File 'ext/RMagick/rmilist.c', line 1164

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

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

    exception = AcquireExceptionInfo();
    (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);

    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 1780

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 1788

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 1796

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_internal.rb', line 1803

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
  a
end

#write(file) ⇒ 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.

Ruby usage:

- @verbatim ImageList#write(file) @endverbatim

Parameters:

  • self —

    this object

  • file —

    the file

Returns:

  • self



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# File 'ext/RMagick/rmilist.c', line 1243

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


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

        // Ensure file is open - raise error if not
        GetOpenFile(file, fptr);
#if defined(_WIN32)
        add_format_prefix(info, fptr->pathv);
        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++;
        strcpy(img->filename, info->filename);
    }

    // Find out if the format supports multi-images files.
    exception = AcquireExceptionInfo();
    (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 && GetMagickAdjoin(m))
    {
        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);

    RB_GC_GUARD(info_obj);

    return self;
}