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Diffstat (limited to '')
-rw-r--r-- | vcl/source/bitmap/BitmapAlphaClampFilter.cxx | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/vcl/source/bitmap/BitmapAlphaClampFilter.cxx b/vcl/source/bitmap/BitmapAlphaClampFilter.cxx new file mode 100644 index 000000000..69691d51c --- /dev/null +++ b/vcl/source/bitmap/BitmapAlphaClampFilter.cxx @@ -0,0 +1,45 @@ +/* -*- 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/bitmapex.hxx> +#include <vcl/BitmapAlphaClampFilter.hxx> + +#include <bitmap/BitmapWriteAccess.hxx> + +BitmapEx BitmapAlphaClampFilter::execute(BitmapEx const& rBitmapEx) const +{ + if (!rBitmapEx.IsAlpha()) + return rBitmapEx; + + AlphaMask aBitmapAlpha(rBitmapEx.GetAlpha()); + { + AlphaScopedWriteAccess pWriteAlpha(aBitmapAlpha); + const Size aSize(rBitmapEx.GetSizePixel()); + + for (sal_Int32 nY = 0; nY < sal_Int32(aSize.Height()); ++nY) + { + Scanline pScanAlpha = pWriteAlpha->GetScanline(nY); + + for (sal_Int32 nX = 0; nX < sal_Int32(aSize.Width()); ++nX) + { + BitmapColor aBitmapAlphaValue(pWriteAlpha->GetPixelFromData(pScanAlpha, nX)); + if (aBitmapAlphaValue.GetIndex() > mcThreshold) + { + aBitmapAlphaValue.SetIndex(255); + pWriteAlpha->SetPixelOnData(pScanAlpha, nX, aBitmapAlphaValue); + } + } + } + } + + return BitmapEx(rBitmapEx.GetBitmap(), aBitmapAlpha); +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |