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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 <basegfx/color/bcolortools.hxx>
#include <bitmap/BitmapWriteAccess.hxx>
#include <bitmap/BitmapMaskToAlphaFilter.hxx>
/**
* Convert a 1-bit mask to an alpha layer
*/
BitmapEx BitmapMaskToAlphaFilter::execute(BitmapEx const& rBitmapEx) const
{
const Size aSize(rBitmapEx.GetSizePixel());
Bitmap aBitmap(rBitmapEx.GetBitmap());
Bitmap aOutBitmap(aSize, vcl::PixelFormat::N8_BPP, &Bitmap::GetGreyPalette(256));
Bitmap::ScopedReadAccess pRead(aBitmap);
BitmapScopedWriteAccess pWrite(aOutBitmap);
if (pRead && pWrite)
{
assert(pRead->HasPalette() && "only supposed to be called with 1-bit mask");
assert(pRead->GetPaletteEntryCount() == 2);
for (sal_Int32 nY = 0; nY < sal_Int32(aSize.Height()); ++nY)
{
Scanline pScanline = pWrite->GetScanline(nY);
Scanline pScanlineRead = pRead->GetScanline(nY);
for (sal_Int32 nX = 0; nX < sal_Int32(aSize.Width()); ++nX)
{
BitmapColor aBmpColor = pRead->GetPixelFromData(pScanlineRead, nX);
if (aBmpColor == COL_BLACK)
aBmpColor = COL_BLACK;
else if (aBmpColor == COL_WHITE)
aBmpColor = COL_WHITE;
else if (aBmpColor == Color(0, 0, 1))
aBmpColor = COL_WHITE;
else
assert(false);
pWrite->SetPixelOnData(pScanline, nX, aBmpColor);
}
}
}
pWrite.reset();
pRead.reset();
return BitmapEx(aOutBitmap);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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