source/modules/juce_graphics/effects/juce_GlowEffect.cpp

   1 /*
   2   ==============================================================================
   3
   4    This file is part of the JUCE library.
   5    Copyright (c) 2022 - Raw Material Software Limited
   6
   7    JUCE is an open source library subject to commercial or open-source
   8    licensing.
   9
  10    By using JUCE, you agree to the terms of both the JUCE 7 End-User License
  11    Agreement and JUCE Privacy Policy.
  12
  13    End User License Agreement: www.juce.com/juce-7-licence
  14    Privacy Policy: www.juce.com/juce-privacy-policy
  15
  16    Or: You may also use this code under the terms of the GPL v3 (see
  17    www.gnu.org/licenses).
  18
  19    JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
  20    EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
  21    DISCLAIMED.
  22
  23   ==============================================================================
  24 */
  25
  26 namespace juce
  27 {
  28
  29 GlowEffect::GlowEffect() {}
  30 GlowEffect::~GlowEffect() {}
  31
  32 void GlowEffect::setGlowProperties (float newRadius, Colour newColour, Point<int> pos)
  33 {
  34     radius = newRadius;
  35     colour = newColour;
  36     offset = pos;
  37 }
  38
  39 void GlowEffect::applyEffect (Image& image, Graphics& g, float scaleFactor, float alpha)
  40 {
  41     Image temp (image.getFormat(), image.getWidth(), image.getHeight(), true);
  42
  43     ImageConvolutionKernel blurKernel (roundToInt (radius * scaleFactor * 2.0f));
  44
  45     blurKernel.createGaussianBlur (radius);
  46     blurKernel.rescaleAllValues (radius);
  47
  48     blurKernel.applyToImage (temp, image, image.getBounds());
  49
  50     g.setColour (colour.withMultipliedAlpha (alpha));
  51     g.drawImageAt (temp, offset.x, offset.y, true);
  52
  53     g.setOpacity (alpha);
  54     g.drawImageAt (image, offset.x, offset.y, false);
  55 }
  56
  57 } // namespace juce