Carla/source/modules/juce_graphics/effects/juce_GlowEffect.h

/*
  ==============================================================================

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

//==============================================================================
/**
    A component effect that adds a coloured blur around the component's contents.

    (This will only work on non-opaque components).

    @see Component::setComponentEffect, DropShadowEffect

    @tags{Graphics}
*/
class JUCE_API  GlowEffect  : public ImageEffectFilter
{
public:
    //==============================================================================
    /** Creates a default 'glow' effect.
        To customise its appearance, use the setGlowProperties() method.
    */
    GlowEffect();

    /** Destructor. */
    ~GlowEffect() override;

    //==============================================================================
    /** Sets the glow's radius and colour.

        The radius is how large the blur should be, and the colour is
        used to render it (for a less intense glow, lower the colour's
        opacity).
    */
    void setGlowProperties (float newRadius,
                            Colour newColour,
                            Point<int> offset = {});


    //==============================================================================
    /** @internal */
    void applyEffect (Image&, Graphics&, float scaleFactor, float alpha) override;

private:
    //==============================================================================
    float radius = 2.0f;
    Colour colour { Colours::white };
    Point<int> offset;

    JUCE_LEAK_DETECTOR (GlowEffect)
};

} // namespace juce