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diff --git a/vcl/source/bitmap/BitmapInterpolateScaleFilter.cxx b/vcl/source/bitmap/BitmapInterpolateScaleFilter.cxx
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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 <tools/helpers.hxx>
+#include <osl/diagnose.h>
+
+#include <vcl/bitmapex.hxx>
+
+#include <bitmap/BitmapWriteAccess.hxx>
+#include <bitmap/BitmapFastScaleFilter.hxx>
+#include <bitmap/BitmapInterpolateScaleFilter.hxx>
+
+BitmapEx BitmapInterpolateScaleFilter::execute(BitmapEx const& rBitmapEx) const
+{
+ Bitmap aBitmap(rBitmapEx.GetBitmap());
+
+ const Size aSizePix(aBitmap.GetSizePixel());
+ const sal_Int32 nNewWidth = FRound(aSizePix.Width() * mfScaleX);
+ const sal_Int32 nNewHeight = FRound(aSizePix.Height() * mfScaleY);
+ bool bRet = false;
+
+ if ((nNewWidth > 1) && (nNewHeight > 1))
+ {
+ Bitmap::ScopedReadAccess pReadAcc(aBitmap);
+ if (pReadAcc)
+ {
+ sal_Int32 nWidth = pReadAcc->Width();
+ sal_Int32 nHeight = pReadAcc->Height();
+ Bitmap aNewBmp(Size(nNewWidth, nHeight), vcl::PixelFormat::N24_BPP);
+ BitmapScopedWriteAccess pWriteAcc(aNewBmp);
+
+ if (pWriteAcc)
+ {
+ if (1 == nWidth)
+ {
+ for (sal_Int32 nY = 0; nY < nHeight; nY++)
+ {
+ Scanline pScanlineRead = pReadAcc->GetScanline(nY);
+ BitmapColor aCol0;
+ if (pReadAcc->HasPalette())
+ {
+ aCol0 = pReadAcc->GetPaletteColor(
+ pReadAcc->GetIndexFromData(pScanlineRead, 0));
+ }
+ else
+ {
+ aCol0 = pReadAcc->GetPixelFromData(pScanlineRead, 0);
+ }
+
+ Scanline pScanline = pWriteAcc->GetScanline(nY);
+ for (sal_Int32 nX = 0; nX < nNewWidth; nX++)
+ {
+ pWriteAcc->SetPixelOnData(pScanline, nX, aCol0);
+ }
+ }
+ }
+ else
+ {
+ const sal_Int32 nNewWidth1 = nNewWidth - 1;
+ const sal_Int32 nWidth1 = pReadAcc->Width() - 1;
+ const double fRevScaleX = static_cast<double>(nWidth1) / nNewWidth1;
+
+ std::unique_ptr<sal_Int32[]> pLutInt(new sal_Int32[nNewWidth]);
+ std::unique_ptr<sal_Int32[]> pLutFrac(new sal_Int32[nNewWidth]);
+
+ for (sal_Int32 nX = 0, nTemp = nWidth - 2; nX < nNewWidth; nX++)
+ {
+ double fTemp = nX * fRevScaleX;
+ pLutInt[nX] = MinMax(static_cast<sal_Int32>(fTemp), 0, nTemp);
+ fTemp -= pLutInt[nX];
+ pLutFrac[nX] = static_cast<sal_Int32>(fTemp * 1024.);
+ }
+
+ for (sal_Int32 nY = 0; nY < nHeight; nY++)
+ {
+ Scanline pScanlineRead = pReadAcc->GetScanline(nY);
+ Scanline pScanline = pWriteAcc->GetScanline(nY);
+ for (sal_Int32 nX = 0; nX < nNewWidth; nX++)
+ {
+ sal_Int32 nTemp = pLutInt[nX];
+
+ BitmapColor aCol0, aCol1;
+ if (pReadAcc->HasPalette())
+ {
+ aCol0 = pReadAcc->GetPaletteColor(
+ pReadAcc->GetIndexFromData(pScanlineRead, nTemp++));
+ aCol1 = pReadAcc->GetPaletteColor(
+ pReadAcc->GetIndexFromData(pScanlineRead, nTemp));
+ }
+ else
+ {
+ aCol0 = pReadAcc->GetPixelFromData(pScanlineRead, nTemp++);
+ aCol1 = pReadAcc->GetPixelFromData(pScanlineRead, nTemp);
+ }
+
+ nTemp = pLutFrac[nX];
+
+ sal_Int32 lXR0 = aCol0.GetRed();
+ sal_Int32 lXG0 = aCol0.GetGreen();
+ sal_Int32 lXB0 = aCol0.GetBlue();
+ sal_Int32 lXR1 = aCol1.GetRed() - lXR0;
+ sal_Int32 lXG1 = aCol1.GetGreen() - lXG0;
+ sal_Int32 lXB1 = aCol1.GetBlue() - lXB0;
+
+ aCol0.SetRed(
+ static_cast<sal_uInt8>((lXR1 * nTemp + (lXR0 << 10)) >> 10));
+ aCol0.SetGreen(
+ static_cast<sal_uInt8>((lXG1 * nTemp + (lXG0 << 10)) >> 10));
+ aCol0.SetBlue(
+ static_cast<sal_uInt8>((lXB1 * nTemp + (lXB0 << 10)) >> 10));
+
+ pWriteAcc->SetPixelOnData(pScanline, nX, aCol0);
+ }
+ }
+ }
+
+ bRet = true;
+ }
+
+ pReadAcc.reset();
+ pWriteAcc.reset();
+
+ if (bRet)
+ {
+ bRet = false;
+ const Bitmap aOriginal(aBitmap);
+ aBitmap = aNewBmp;
+ aNewBmp = Bitmap(Size(nNewWidth, nNewHeight), vcl::PixelFormat::N24_BPP);
+ pReadAcc = Bitmap::ScopedReadAccess(aBitmap);
+ pWriteAcc = BitmapScopedWriteAccess(aNewBmp);
+
+ if (pReadAcc && pWriteAcc)
+ {
+ // after 1st step, bitmap *is* 24bit format (see above)
+ OSL_ENSURE(!pReadAcc->HasPalette(), "OOps, somehow ImplScaleInterpolate "
+ "in-between format has palette, should not "
+ "happen (!)");
+
+ if (1 == nHeight)
+ {
+ for (sal_Int32 nX = 0; nX < nNewWidth; nX++)
+ {
+ BitmapColor aCol0 = pReadAcc->GetPixel(0, nX);
+
+ for (sal_Int32 nY = 0; nY < nNewHeight; nY++)
+ {
+ pWriteAcc->SetPixel(nY, nX, aCol0);
+ }
+ }
+ }
+ else
+ {
+ const sal_Int32 nNewHeight1 = nNewHeight - 1;
+ const sal_Int32 nHeight1 = pReadAcc->Height() - 1;
+ const double fRevScaleY = static_cast<double>(nHeight1) / nNewHeight1;
+
+ std::unique_ptr<sal_Int32[]> pLutInt(new sal_Int32[nNewHeight]);
+ std::unique_ptr<sal_Int32[]> pLutFrac(new sal_Int32[nNewHeight]);
+
+ for (sal_Int32 nY = 0, nTemp = nHeight - 2; nY < nNewHeight; nY++)
+ {
+ double fTemp = nY * fRevScaleY;
+ pLutInt[nY] = MinMax(static_cast<sal_Int32>(fTemp), 0, nTemp);
+ fTemp -= pLutInt[nY];
+ pLutFrac[nY] = static_cast<sal_Int32>(fTemp * 1024.);
+ }
+
+ for (sal_Int32 nX = 0; nX < nNewWidth; nX++)
+ {
+ for (sal_Int32 nY = 0; nY < nNewHeight; nY++)
+ {
+ sal_Int32 nTemp = pLutInt[nY];
+
+ BitmapColor aCol0 = pReadAcc->GetPixel(nTemp++, nX);
+ BitmapColor aCol1 = pReadAcc->GetPixel(nTemp, nX);
+
+ nTemp = pLutFrac[nY];
+
+ sal_Int32 lXR0 = aCol0.GetRed();
+ sal_Int32 lXG0 = aCol0.GetGreen();
+ sal_Int32 lXB0 = aCol0.GetBlue();
+ sal_Int32 lXR1 = aCol1.GetRed() - lXR0;
+ sal_Int32 lXG1 = aCol1.GetGreen() - lXG0;
+ sal_Int32 lXB1 = aCol1.GetBlue() - lXB0;
+
+ aCol0.SetRed(
+ static_cast<sal_uInt8>((lXR1 * nTemp + (lXR0 << 10)) >> 10));
+ aCol0.SetGreen(
+ static_cast<sal_uInt8>((lXG1 * nTemp + (lXG0 << 10)) >> 10));
+ aCol0.SetBlue(
+ static_cast<sal_uInt8>((lXB1 * nTemp + (lXB0 << 10)) >> 10));
+
+ pWriteAcc->SetPixel(nY, nX, aCol0);
+ }
+ }
+ }
+
+ bRet = true;
+ }
+
+ pReadAcc.reset();
+ pWriteAcc.reset();
+
+ if (bRet)
+ {
+ aOriginal.AdaptBitCount(aNewBmp);
+ aBitmap = aNewBmp;
+ }
+ }
+ }
+ }
+
+ if (!bRet)
+ {
+ // fallback to fast scale filter
+ BitmapEx aBmpEx(aBitmap);
+ bRet = BitmapFilter::Filter(aBmpEx, BitmapFastScaleFilter(mfScaleX, mfScaleY));
+ aBitmap = aBmpEx.GetBitmap();
+ }
+
+ if (bRet)
+ return BitmapEx(aBitmap);
+
+ return BitmapEx();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-20 11:32:51 +0000