juce_GlowEffect.cpp

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 /*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited
 
   JUCE is an open source library subject to commercial or open-source
   licensing.
 
   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.
 
   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-privacy-policy
 
   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).
 
   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
{
 
GlowEffect::GlowEffect() {}
GlowEffect::~GlowEffect() {}
 
void GlowEffect::setGlowProperties (float newRadius, Colour newColour, Point<int> pos)
{
    radius = newRadius;
    colour = newColour;
    offset = pos;
}
 
void GlowEffect::applyEffect (Image& image, Graphics& g, float scaleFactor, float alpha)
{
    Image temp (image.getFormat(), image.getWidth(), image.getHeight(), true);
 
    ImageConvolutionKernel blurKernel (roundToInt (radius * scaleFactor * 2.0f));
 
    blurKernel.createGaussianBlur (radius);
    blurKernel.rescaleAllValues (radius);
 
    blurKernel.applyToImage (temp, image, image.getBounds());
 
    g.setColour (colour.withMultipliedAlpha (alpha));
    g.drawImageAt (temp, offset.x, offset.y, true);
 
    g.setOpacity (alpha);
    g.drawImageAt (image, offset.x, offset.y, false);
}
 
} // namespace juce