Method: Magick::Image#composite_mathematics

Defined in:
ext/RMagick/rmimage.cpp

#composite_mathematics(image, a, b, c, d, gravity) ⇒ Magick::Image #composite_mathematics(image, a, b, c, d, x_off, y_off) ⇒ Magick::Image #composite_mathematics(image, a, b, c, d, gravity, x_off, y_off) ⇒ Magick::Image

Merge the source and destination images according to the formula

a*Sc*Dc + b*Sc + c*Dc + d

where Sc is the source pixel and Dc is the destination pixel.

Overloads:

  • #composite_mathematics(image, a, b, c, d, gravity) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • a (Numeric) —

      See the description.

    • b (Numeric) —

      See the description.

    • c (Numeric) —

      See the description.

    • d (Numeric) —

      See the description.

    • gravity (Magick::GravityType) —

      the gravity type

  • #composite_mathematics(image, a, b, c, d, x_off, y_off) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • a (Numeric) —

      See the description.

    • b (Numeric) —

      See the description.

    • c (Numeric) —

      See the description.

    • d (Numeric) —

      See the description.

    • x_off (Numeric) —

      The x-offset of the composited image, measured relative to the gravity argument.

    • y_off (Numeric) —

      The y-offset of the composited image, measured relative to the gravity argument.

  • #composite_mathematics(image, a, b, c, d, gravity, x_off, y_off) ⇒ Magick::Image

    Parameters:

    • image (Magick::Image, Magick::ImageList) —

      Either an imagelist or an image. If an imagelist, uses the current image.

    • a (Numeric) —

      See the description.

    • b (Numeric) —

      See the description.

    • c (Numeric) —

      See the description.

    • d (Numeric) —

      See the description.

    • gravity (Magick::GravityType) —

      the gravity type

    • x_off (Numeric) —

      The x-offset of the composited image, measured relative to the gravity argument.

    • y_off (Numeric) —

      The y-offset of the composited image, measured relative to the gravity argument.

Returns:



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# File 'ext/RMagick/rmimage.cpp', line 4058

VALUE
Image_composite_mathematics(int argc, VALUE *argv, VALUE self)
{
    Image *composite_image;
    VALUE args[5];
    signed long x_off = 0L;
    signed long y_off = 0L;
    GravityType gravity = NorthWestGravity;
    char compose_args[200];

    rm_check_destroyed(self);

    switch (argc)
    {
        case 8:
            VALUE_TO_ENUM(argv[5], gravity, GravityType);
            x_off = NUM2LONG(argv[6]);
            y_off = NUM2LONG(argv[7]);
            break;
        case 7:
            x_off = NUM2LONG(argv[5]);
            y_off = NUM2LONG(argv[6]);
            break;
        case 6:
            VALUE_TO_ENUM(argv[5], gravity, GravityType);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (got %d, expected 6 to 8)", argc);
            break;
    }

    composite_image = rm_check_destroyed(rm_cur_image(argv[0]));

    snprintf(compose_args, sizeof(compose_args), "%-.16g,%-.16g,%-.16g,%-.16g", NUM2DBL(argv[1]), NUM2DBL(argv[2]), NUM2DBL(argv[3]), NUM2DBL(argv[4]));
    SetImageArtifact(composite_image, "compose:args", compose_args);

    // Call composite(False, gravity, x_off, y_off, MathematicsCompositeOp, DefaultChannels)
    args[0] = argv[0];
    args[1] = GravityType_find(gravity);
    args[2] = LONG2FIX(x_off);
    args[3] = LONG2FIX(y_off);
    args[4] = CompositeOperator_find(MathematicsCompositeOp);

    return composite(False, 5, args, self, DefaultChannels);
}