Method: Magick::Image#matte_flood_fill

Defined in:
ext/RMagick/rmimage.cpp

#Image ⇒ Magick::Image

Makes transparent all the pixels that are the same color as the pixel at x, y, and are neighbors.

Returns a new image.

Parameters:

  • color (Magick::Pixel, String) —

    the color name

  • x_obj (Numeric) —

    x position

  • y_obj (Numeric) —

    y position

  • method_obj (Magick::PaintMethod) —

    which method to call: FloodfillMethod or FillToBorderMethod

  • alpha (Numeric) —

    the alpha

Returns:



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# File 'ext/RMagick/rmimage.cpp', line 9352

VALUE
Image_matte_flood_fill(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    PixelColor target;
    Quantum alpha;
    long x, y;
    PaintMethod method;
    DrawInfo *draw_info;
    MagickPixel target_mpp;
    MagickBooleanType invert;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);

    if (argc != 5)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 5)", argc);
    }

    alpha = get_named_alpha_value(argv[4]);

    Color_to_PixelColor(&target, argv[0]);
    VALUE_TO_ENUM(argv[3], method, PaintMethod);
    if (!(method == FloodfillMethod || method == FillToBorderMethod))
    {
        rb_raise(rb_eArgError, "paint method_obj must be FloodfillMethod or "
                 "FillToBorderMethod (%d given)", method);
    }
    x = NUM2LONG(argv[1]);
    y = NUM2LONG(argv[2]);
    if ((unsigned long)x > image->columns || (unsigned long)y > image->rows)
    {
        rb_raise(rb_eArgError, "target out of range. %ldx%ld given, image is %" RMIuSIZE "x%" RMIuSIZE "",
                 x, y, image->columns, image->rows);
    }


    new_image = rm_clone_image(image);

    // FloodfillPaintImage looks for the opacity in the DrawInfo.fill field.
    draw_info = CloneDrawInfo(NULL, NULL);
    if (!draw_info)
    {
        rb_raise(rb_eNoMemError, "not enough memory to continue");
    }
#if defined(IMAGEMAGICK_7)
    rm_set_pixelinfo_alpha(&draw_info->fill, alpha);
#else
    draw_info->fill.opacity = QuantumRange - alpha;
#endif

    if (method == FillToBorderMethod)
    {
        invert = MagickTrue;
        target_mpp.red   = (MagickRealType) image->border_color.red;
        target_mpp.green = (MagickRealType) image->border_color.green;
        target_mpp.blue  = (MagickRealType) image->border_color.blue;
#if defined(IMAGEMAGICK_7)
        rm_set_pixelinfo_alpha(&target_mpp, (MagickRealType) image->border_color.alpha);
#else
        target_mpp.opacity = (MagickRealType) image->border_color.opacity;
#endif
    }
    else
    {
        invert = MagickFalse;
        target_mpp.red   = (MagickRealType) target.red;
        target_mpp.green = (MagickRealType) target.green;
        target_mpp.blue  = (MagickRealType) target.blue;
#if defined(IMAGEMAGICK_7)
        rm_set_pixelinfo_alpha(&target_mpp, (MagickRealType) target.alpha);
#else
        target_mpp.opacity = (MagickRealType) target.opacity;
#endif
    }

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    BEGIN_CHANNEL_MASK(new_image, OpacityChannel);
    GVL_STRUCT_TYPE(FloodfillPaintImage) args = { new_image, draw_info, &target_mpp, x, y, invert, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FloodfillPaintImage), &args);
    END_CHANNEL_MASK(new_image);
    DestroyDrawInfo(draw_info);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(FloodfillPaintImage) args = { new_image, OpacityChannel, draw_info, &target_mpp, x, y, invert };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(FloodfillPaintImage), &args);
    DestroyDrawInfo(draw_info);

    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}