- added JUCE library code

git-svn-id: http://moon:8086/svn/software/trunk/projects/FsTrack@357 b431acfa-c32f-4a4a-93f1-934dc6c82436
2018-06-12 16:53:56 +00:00
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+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2013 - Raw Material Software Ltd.
+
+   Permission is granted to use this software under the terms of either:
+   a) the GPL v2 (or any later version)
+   b) the Affero GPL v3
+
+   Details of these licenses can be found at: www.gnu.org/licenses
+
+   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+   ------------------------------------------------------------------------------
+
+   To release a closed-source product which uses JUCE, commercial licenses are
+   available: visit www.juce.com for more information.
+
+  ==============================================================================
+*/
+
+#ifndef JUCE_DROPSHADOWEFFECT_H_INCLUDED
+#define JUCE_DROPSHADOWEFFECT_H_INCLUDED
+
+
+//==============================================================================
+/**
+    Defines a drop-shadow effect.
+*/
+struct JUCE_API  DropShadow
+{
+    /** Creates a default drop-shadow effect. */
+    DropShadow() noexcept;
+
+    /** Creates a drop-shadow object with the given parameters. */
+    DropShadow (Colour shadowColour, int radius, Point<int> offset) noexcept;
+
+    /** Renders a drop-shadow based on the alpha-channel of the given image. */
+    void drawForImage (Graphics& g, const Image& srcImage) const;
+
+    /** Renders a drop-shadow based on the shape of a path. */
+    void drawForPath (Graphics& g, const Path& path) const;
+
+    /** Renders a drop-shadow for a rectangle.
+        Note that for speed, this approximates the shadow using gradients.
+    */
+    void drawForRectangle (Graphics& g, const Rectangle<int>& area) const;
+
+    /** The colour with which to render the shadow.
+        In most cases you'll probably want to leave this as black with an alpha
+        value of around 0.5
+    */
+    Colour colour;
+
+    /** The approximate spread of the shadow. */
+    int radius;
+
+    /** The offset of the shadow. */
+    Point<int> offset;
+};
+
+//==============================================================================
+/**
+    An effect filter that adds a drop-shadow behind the image's content.
+
+    (This will only work on images/components that aren't opaque, of course).
+
+    When added to a component, this effect will draw a soft-edged
+    shadow based on what gets drawn inside it. The shadow will also
+    be applied to the component's children.
+
+    For speed, this doesn't use a proper gaussian blur, but cheats by
+    using a simple bilinear filter. If you need a really high-quality
+    shadow, check out ImageConvolutionKernel::createGaussianBlur()
+
+    @see Component::setComponentEffect
+*/
+class JUCE_API  DropShadowEffect  : public ImageEffectFilter
+{
+public:
+    //==============================================================================
+    /** Creates a default drop-shadow effect.
+        To customise the shadow's appearance, use the setShadowProperties() method.
+    */
+    DropShadowEffect();
+
+    /** Destructor. */
+    ~DropShadowEffect();
+
+    //==============================================================================
+    /** Sets up parameters affecting the shadow's appearance. */
+    void setShadowProperties (const DropShadow& newShadow);
+
+    //==============================================================================
+    /** @internal */
+    void applyEffect (Image& sourceImage, Graphics& destContext, float scaleFactor, float alpha);
+
+
+private:
+    //==============================================================================
+    DropShadow shadow;
+
+    JUCE_LEAK_DETECTOR (DropShadowEffect)
+};
+
+
+#endif   // JUCE_DROPSHADOWEFFECT_H_INCLUDED