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, 0, 0, true);
g.setOpacity (alpha);
g.drawImageAt (image, 0, 0, false);
}
void DropShadower::updateShadows()
{
if (reentrant || owner == nullptr)
return;
ComponentPeer* const peer = owner->getPeer();
const bool isOwnerVisible = owner->isVisible() && (peer == nullptr || ! peer->isMinimised());
const bool createShadowWindows = shadowWindows.size() == 0
&& owner->getWidth() > 0
&& owner->getHeight() > 0
&& isOwnerVisible
&& (Desktop::canUseSemiTransparentWindows()
|| owner->getParentComponent() != nullptr);
{
const ScopedValueSetter<bool> setter (reentrant, true, false);
const int shadowEdge = jmax (xOffset, yOffset) + (int) blurRadius;
if (createShadowWindows)
{
// keep a cached version of the image to save doing the gaussian too often
String imageId;
imageId << shadowEdge << ',' << xOffset << ',' << yOffset << ',' << alpha;
const int hash = imageId.hashCode();
Image bigIm (ImageCache::getFromHashCode (hash));
if (bigIm.isNull())
{
bigIm = Image (Image::ARGB, shadowEdge * 5, shadowEdge * 5, true, Image::NativeImage);
Graphics bigG (bigIm);
bigG.setColour (Colours::black.withAlpha (alpha));
bigG.fillRect (shadowEdge + xOffset,
shadowEdge + yOffset,
bigIm.getWidth() - (shadowEdge * 2),
bigIm.getHeight() - (shadowEdge * 2));
ImageConvolutionKernel blurKernel (roundToInt (blurRadius * 2.0f));
blurKernel.createGaussianBlur (blurRadius);
blurKernel.applyToImage (bigIm, bigIm,
Rectangle<int> (xOffset, yOffset,
bigIm.getWidth(), bigIm.getHeight()));
ImageCache::addImageToCache (bigIm, hash);
}
const int iw = bigIm.getWidth();
const int ih = bigIm.getHeight();
const int shadowEdge2 = shadowEdge * 2;
setShadowImage (bigIm, 0, shadowEdge, shadowEdge2, 0, 0);
setShadowImage (bigIm, 1, shadowEdge, shadowEdge2, 0, ih - shadowEdge2);
setShadowImage (bigIm, 2, shadowEdge, shadowEdge, 0, shadowEdge2);
setShadowImage (bigIm, 3, shadowEdge, shadowEdge2, iw - shadowEdge, 0);
setShadowImage (bigIm, 4, shadowEdge, shadowEdge2, iw - shadowEdge, ih - shadowEdge2);
setShadowImage (bigIm, 5, shadowEdge, shadowEdge, iw - shadowEdge, shadowEdge2);
setShadowImage (bigIm, 6, shadowEdge, shadowEdge, shadowEdge, 0);
setShadowImage (bigIm, 7, shadowEdge, shadowEdge, iw - shadowEdge2, 0);
setShadowImage (bigIm, 8, shadowEdge, shadowEdge, shadowEdge2, 0);
setShadowImage (bigIm, 9, shadowEdge, shadowEdge, shadowEdge, ih - shadowEdge);
setShadowImage (bigIm, 10, shadowEdge, shadowEdge, iw - shadowEdge2, ih - shadowEdge);
setShadowImage (bigIm, 11, shadowEdge, shadowEdge, shadowEdge2, ih - shadowEdge);
for (int i = 0; i < 4; ++i)
shadowWindows.add (new ShadowWindow (*owner, i, shadowImageSections));
}
if (shadowWindows.size() >= 4)
{
const int x = owner->getX();
const int y = owner->getY() - shadowEdge;
const int w = owner->getWidth();
const int h = owner->getHeight() + shadowEdge + shadowEdge;
for (int i = shadowWindows.size(); --i >= 0;)
{
// there seem to be rare situations where the dropshadower may be deleted by
// callbacks during this loop, so use a weak ref to watch out for this..
WeakReference<Component> sw (shadowWindows[i]);
if (sw != nullptr)
sw->setAlwaysOnTop (owner->isAlwaysOnTop());
if (sw != nullptr)
sw->setVisible (isOwnerVisible);
if (sw != nullptr)
{
switch (i)
{
case 0: sw->setBounds (x - shadowEdge, y, shadowEdge, h); break;
case 1: sw->setBounds (x + w, y, shadowEdge, h); break;
case 2: sw->setBounds (x, y, w, shadowEdge); break;
case 3: sw->setBounds (x, owner->getBottom(), w, shadowEdge); break;
default: break;
}
}
if (sw == nullptr)
return;
}
}
}
if (createShadowWindows)
bringShadowWindowsToFront();
}