Method: Magick::Image#dissolve

Defined in:
ext/RMagick/rmimage.c

#dissolve(*args) ⇒ Object

Corresponds to the composite_image -dissolve operation.

Ruby usage:

- @verbatim Image#dissolve(overlay, src_percent) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent, x_offset) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent, x_offset, y_offset) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent, gravity) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent, gravity, x_offset) @endverbatim
- @verbatim Image#dissolve(overlay, src_percent, dst_percent, gravity, x_offset, y_offset) @endverbatim

Notes:

- `percent' can be a number or a string in the form "NN%"
- Default dst_percent is -1.0 (tells blend_geometry to leave it out of the
  geometry string)
- Default x_offset is 0
- Default y_offset is 0

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object

Returns:

  • a new image

See Also:

  • special_composite
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# File 'ext/RMagick/rmimage.c', line 5028

VALUE
Image_dissolve(int argc, VALUE *argv, VALUE self)
{
    Image *image, *overlay;
    double src_percent, dst_percent = -1.0;
    long x_offset = 0L, y_offset = 0L;
    volatile VALUE composite_image, ovly;

    image = rm_check_destroyed(self);

    if (argc < 1)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
    }

    ovly = rm_cur_image(argv[0]);
    overlay = rm_check_destroyed(ovly);

    if (argc > 3)
    {
        get_composite_offsets(argc-3, &argv[3], image, overlay, &x_offset, &y_offset);
        // There must be 3 arguments left
        argc = 3;
    }

    switch (argc)
    {
        case 3:
            dst_percent = rm_percentage(argv[2],1.0) * 100.0;
        case 2:
            src_percent = rm_percentage(argv[1],1.0) * 100.0;
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
            break;
    }

    composite_image =  special_composite(image, overlay, src_percent, dst_percent
                                         , x_offset, y_offset, DissolveCompositeOp);

    return composite_image;
}