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