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107 lines
3.6 KiB
C++
107 lines
3.6 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library - "Jules' Utility Class Extensions"
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Copyright 2004-11 by Raw Material Software Ltd.
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------------------------------------------------------------------------------
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JUCE can be redistributed and/or modified under the terms of the GNU General
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Public License (Version 2), as published by the Free Software Foundation.
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A copy of the license is included in the JUCE distribution, or can be found
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online 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.rawmaterialsoftware.com/juce for more information.
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==============================================================================
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*/
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#if JUCE_MSVC && JUCE_DEBUG
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#pragma optimize ("t", on)
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#endif
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//==============================================================================
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DropShadowEffect::DropShadowEffect()
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: offsetX (0),
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offsetY (0),
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radius (4),
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opacity (0.6f)
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{
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}
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DropShadowEffect::~DropShadowEffect()
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{
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}
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void DropShadowEffect::setShadowProperties (const float newRadius,
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const float newOpacity,
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const int newShadowOffsetX,
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const int newShadowOffsetY)
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{
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radius = jmax (1.1f, newRadius);
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offsetX = newShadowOffsetX;
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offsetY = newShadowOffsetY;
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opacity = newOpacity;
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}
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void DropShadowEffect::applyEffect (Image& image, Graphics& g, float alpha)
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{
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const int w = image.getWidth();
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const int h = image.getHeight();
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Image shadowImage (Image::SingleChannel, w, h, false);
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{
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const Image::BitmapData srcData (image, Image::BitmapData::readOnly);
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const Image::BitmapData destData (shadowImage, Image::BitmapData::readWrite);
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const int filter = roundToInt (63.0f / radius);
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const int radiusMinus1 = roundToInt ((radius - 1.0f) * 63.0f);
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for (int x = w; --x >= 0;)
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{
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int shadowAlpha = 0;
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const PixelARGB* src = ((const PixelARGB*) srcData.data) + x;
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uint8* shadowPix = destData.data + x;
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for (int y = h; --y >= 0;)
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{
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shadowAlpha = ((shadowAlpha * radiusMinus1 + (src->getAlpha() << 6)) * filter) >> 12;
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*shadowPix = (uint8) shadowAlpha;
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src = addBytesToPointer (src, srcData.lineStride);
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shadowPix += destData.lineStride;
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}
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}
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for (int y = h; --y >= 0;)
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{
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int shadowAlpha = 0;
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uint8* shadowPix = destData.getLinePointer (y);
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for (int x = w; --x >= 0;)
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{
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shadowAlpha = ((shadowAlpha * radiusMinus1 + (*shadowPix << 6)) * filter) >> 12;
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*shadowPix++ = (uint8) shadowAlpha;
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}
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}
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}
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g.setColour (Colours::black.withAlpha (opacity * alpha));
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g.drawImageAt (shadowImage, offsetX, offsetY, true);
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g.setOpacity (alpha);
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g.drawImageAt (image, 0, 0);
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}
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#if JUCE_MSVC && JUCE_DEBUG
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#pragma optimize ("", on) // resets optimisations to the project defaults
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#endif
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