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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/.
*
*/
#include <vcl/bitmapaccess.hxx>
#include <bitmapwriteaccess.hxx>
#include <BitmapDisabledImageFilter.hxx>
BitmapEx BitmapDisabledImageFilter::execute(BitmapEx const& rBitmapEx) const
{
const Size aSize(rBitmapEx.GetSizePixel());
// keep disable image at same depth as original where possible, otherwise
// use 8 bit
sal_uInt16 nBitCount = rBitmapEx.GetBitCount();
if (nBitCount < 8)
nBitCount = 8;
const BitmapPalette* pPal = nBitCount == 8 ? &Bitmap::GetGreyPalette(256) : nullptr;
Bitmap aGrey(aSize, nBitCount, pPal);
BitmapScopedWriteAccess pGrey(aGrey);
BitmapEx aReturnBitmap;
Bitmap aReadBitmap(rBitmapEx.GetBitmap());
Bitmap::ScopedReadAccess pRead(aReadBitmap);
if (pRead && pGrey)
{
for (long nY = 0; nY < aSize.Height(); ++nY)
{
Scanline pGreyScan = pGrey->GetScanline(nY);
Scanline pReadScan = pRead->GetScanline(nY);
for (long nX = 0; nX < aSize.Width(); ++nX)
{
// Get the luminance from RGB color and remap the value from 0-255 to 160-224
const BitmapColor aColor = pRead->GetPixelFromData(pReadScan, nX);
sal_uInt8 nLum(aColor.GetLuminance() / 4 + 160);
BitmapColor aGreyValue(nLum, nLum, nLum, aColor.GetAlpha());
pGrey->SetPixelOnData(pGreyScan, nX, aGreyValue);
}
}
}
if (rBitmapEx.IsTransparent())
{
aReturnBitmap = BitmapEx(aGrey, rBitmapEx.GetAlpha());
}
else
aReturnBitmap = BitmapEx(aGrey);
return aReturnBitmap;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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