96 lines
3.6 KiB
C++
96 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include "GlowSoftEgdeShadowTools.hxx"
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#include <vcl/bitmap/BitmapBasicMorphologyFilter.hxx>
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#include <vcl/bitmap/BitmapFilterStackBlur.hxx>
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namespace drawinglayer::primitive2d
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{
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/* Returns 8-bit alpha mask created from passed mask.
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Negative fErodeDilateRadius values mean erode, positive - dilate.
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nTransparency defines minimal transparency level.
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*/
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AlphaMask ProcessAndBlurAlphaMask(const AlphaMask& rMask, double fErodeDilateRadius,
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double fBlurRadius, sal_uInt8 nTransparency, bool bConvertTo1Bit)
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{
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// Invert it to operate in the transparency domain. Trying to update this method to
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// work in the alpha domain is fraught with hazards.
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AlphaMask tmpMask = rMask;
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tmpMask.Invert();
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// Only completely white pixels on the initial mask must be considered for transparency. Any
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// other color must be treated as black. This creates 1-bit B&W bitmap.
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BitmapEx mask(bConvertTo1Bit ? tmpMask.GetBitmap().CreateMask(COL_WHITE) : tmpMask.GetBitmap());
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// Scaling down increases performance without noticeable quality loss. Additionally,
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// current blur implementation can only handle blur radius between 2 and 254.
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Size aSize = mask.GetSizePixel();
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double fScale = 1.0;
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while (fBlurRadius > 254 || aSize.Height() > 1000 || aSize.Width() > 1000)
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{
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fScale /= 2;
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fBlurRadius /= 2;
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fErodeDilateRadius /= 2;
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aSize /= 2;
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}
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// BmpScaleFlag::NearestNeighbor is important for following color replacement
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mask.Scale(fScale, fScale, BmpScaleFlag::NearestNeighbor);
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if (fErodeDilateRadius > 0)
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BitmapFilter::Filter(mask, BitmapDilateFilter(fErodeDilateRadius));
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else if (fErodeDilateRadius < 0)
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BitmapFilter::Filter(mask, BitmapErodeFilter(-fErodeDilateRadius, 0xFF));
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if (nTransparency)
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{
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const Color aTransparency(nTransparency, nTransparency, nTransparency);
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mask.Replace(COL_BLACK, aTransparency);
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}
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// We need 8-bit grey mask for blurring
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mask.Convert(BmpConversion::N8BitGreys);
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// calculate blurry effect
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BitmapFilter::Filter(mask, BitmapFilterStackBlur(fBlurRadius));
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mask.Scale(rMask.GetSizePixel());
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// And switch to the alpha domain.
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mask.Invert();
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return AlphaMask(mask.GetBitmap());
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}
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drawinglayer::geometry::ViewInformation2D
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expandB2DRangeAtViewInformation2D(const drawinglayer::geometry::ViewInformation2D& rViewInfo,
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double nAmount)
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{
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drawinglayer::geometry::ViewInformation2D aRetval(rViewInfo);
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basegfx::B2DRange viewport(rViewInfo.getViewport());
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viewport.grow(nAmount);
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aRetval.setViewport(viewport);
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return aRetval;
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}
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} // end of namespace drawinglayer::primitive2d
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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