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110 lines
3.8 KiB
110 lines
3.8 KiB
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2015 - ROLI Ltd.
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Permission is granted to use this software under the terms of either:
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a) the GPL v2 (or any later version)
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b) the Affero GPL v3
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Details of these licenses can be found at: www.gnu.org/licenses
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.juce.com for more information.
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==============================================================================
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*/
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#ifndef JUCE_DROPSHADOWEFFECT_H_INCLUDED
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#define JUCE_DROPSHADOWEFFECT_H_INCLUDED
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//==============================================================================
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/**
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Defines a drop-shadow effect.
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*/
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struct JUCE_API DropShadow
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{
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/** Creates a default drop-shadow effect. */
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DropShadow() noexcept;
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/** Creates a drop-shadow object with the given parameters. */
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DropShadow (Colour shadowColour, int radius, Point<int> offset) noexcept;
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/** Renders a drop-shadow based on the alpha-channel of the given image. */
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void drawForImage (Graphics& g, const Image& srcImage) const;
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/** Renders a drop-shadow based on the shape of a path. */
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void drawForPath (Graphics& g, const Path& path) const;
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/** Renders a drop-shadow for a rectangle.
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Note that for speed, this approximates the shadow using gradients.
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*/
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void drawForRectangle (Graphics& g, const Rectangle<int>& area) const;
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/** The colour with which to render the shadow.
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In most cases you'll probably want to leave this as black with an alpha
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value of around 0.5
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*/
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Colour colour;
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/** The approximate spread of the shadow. */
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int radius;
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/** The offset of the shadow. */
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Point<int> offset;
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};
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//==============================================================================
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/**
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An effect filter that adds a drop-shadow behind the image's content.
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(This will only work on images/components that aren't opaque, of course).
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When added to a component, this effect will draw a soft-edged
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shadow based on what gets drawn inside it. The shadow will also
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be applied to the component's children.
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For speed, this doesn't use a proper gaussian blur, but cheats by
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using a simple bilinear filter. If you need a really high-quality
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shadow, check out ImageConvolutionKernel::createGaussianBlur()
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@see Component::setComponentEffect
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*/
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class JUCE_API DropShadowEffect : public ImageEffectFilter
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{
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public:
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//==============================================================================
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/** Creates a default drop-shadow effect.
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To customise the shadow's appearance, use the setShadowProperties() method.
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*/
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DropShadowEffect();
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/** Destructor. */
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~DropShadowEffect();
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//==============================================================================
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/** Sets up parameters affecting the shadow's appearance. */
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void setShadowProperties (const DropShadow& newShadow);
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//==============================================================================
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/** @internal */
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void applyEffect (Image& sourceImage, Graphics& destContext, float scaleFactor, float alpha);
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private:
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//==============================================================================
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DropShadow shadow;
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JUCE_LEAK_DETECTOR (DropShadowEffect)
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};
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#endif // JUCE_DROPSHADOWEFFECT_H_INCLUDED
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