Method: Magick::ImageList#write

Defined in:
ext/RMagick/rmilist.cpp

#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) && !defined(IMAGEMAGICK_GREATER_THAN_EQUAL_7_1_2)
        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;
}