Method: Magick::Image#sparse_color

Defined in:

ext/RMagick/rmimage.cpp

#sparse_color(method, x1, y1, color) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, ...) ⇒ Magick::Image #sparse_color(method, x1, y1, color, channel) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, channel) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, ..., channel) ⇒ Magick::Image #sparse_color(method, x1, y1, color, channel, ...) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, channel, ...) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, ..., channel, ...) ⇒ Magick::Image

Fills the image with the specified color or colors, starting at the x,y coordinates associated with the color and using the specified interpolation method.

Overloads:

• #sparse_color(method, x1, y1, color, x2, y2, color, ..., channel, ...) ⇒ Magick::Image

  Parameters:

  • method (Magick::SparseColorMethod) —

    the method

  • x1 (Float) —

    One or more x.

  • y1 (Float) —

    One or more y.

  • color (Magick::Pixel, String) —

    One or more color

  • channel (Magick::ChannelType) —

    one or more ChannelType arguments

Returns:

• (Magick::Image) —

  a new image

# File 'ext/RMagick/rmimage.cpp', line 13485

VALUE
Image_sparse_color(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    unsigned long x, nargs, ncolors;
    SparseColorMethod method;
    int n, exp;
    double * volatile args;
    ChannelType channels;
    MagickPixel pp;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    n = argc;
    channels = extract_channels(&argc, argv);
    n -= argc;  // n is now the number of channel arguments

    // After the channel arguments have been removed, and not counting the first
    // (method) argument, the number of arguments should be a multiple of 3.
    if (argc < 4 || argc % 3 != 1)
    {
        exp = (argc + 2) / 3 * 3;
        exp = max(exp, 3);
        rb_raise(rb_eArgError, "wrong number of arguments (expected at least %d, got %d)", n+exp+1,  n+argc);
    }

    // Get the method from the argument list
    VALUE_TO_ENUM(argv[0], method, SparseColorMethod);
    argv += 1;
    argc -= 1;

    // A lot of the following code is based on SparseColorOption, in wand/mogrify.c
    ncolors = count_channels(image, &channels);
    nargs = (argc / 3) * (2 + ncolors);

    // Allocate args from Ruby's memory so that GC will collect it if one of
    // the type conversions below raises an exception.
    args = ALLOC_N(double, nargs);
    memset(args, 0, nargs * sizeof(double));

    x = 0;
    n = 0;
    while (n < argc)
    {
        VALUE elem1 = argv[n++];
        VALUE elem2 = argv[n++];
        if (rm_check_num2dbl(elem1) && rm_check_num2dbl(elem2))
        {
            args[x++] = NUM2DBL(elem1);
            args[x++] = NUM2DBL(elem2);
        }
        else
        {
            xfree((void *) args);
            rb_raise(rb_eTypeError, "type mismatch: %s and %s given", rb_class2name(CLASS_OF(elem1)), rb_class2name(CLASS_OF(elem2)));
        }
        Color_to_MagickPixel(NULL, &pp, argv[n++]);
        if (channels & RedChannel)
        {
            args[x++] = pp.red / QuantumRange;
        }
        if (channels & GreenChannel)
        {
            args[x++] = pp.green / QuantumRange;
        }
        if (channels & BlueChannel)
        {
            args[x++] = pp.blue / QuantumRange;
        }
        if (channels & IndexChannel)
        {
            args[x++] = pp.index / QuantumRange;
        }
        if (channels & OpacityChannel)
        {
#if defined(IMAGEMAGICK_7)
            args[x++] = pp.alpha / QuantumRange;
#else
            args[x++] = pp.opacity / QuantumRange;
#endif
        }
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(SparseColorImage) args_SparseColorImage = { image, method, nargs, args, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SparseColorImage), &args_SparseColorImage);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(SparseColorImage) args_SparseColorImage = { image, channels, method, nargs, args, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(SparseColorImage), &args_SparseColorImage);
#endif
    xfree((void *) args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}