1 files changed, 130 insertions, 0 deletions
diff --git a/vcl/source/bitmap/BitmapFastScaleFilter.cxx b/vcl/source/bitmap/BitmapFastScaleFilter.cxx
new file mode 100644
index 000000000000..6bf1700a476f
--- /dev/null
+++ b/vcl/source/bitmap/BitmapFastScaleFilter.cxx
@@ -0,0 +1,130 @@
+/* -*- 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 <vcl/bitmapex.hxx>
+#include <vcl/bitmapaccess.hxx>
+
+#include <bitmapwriteaccess.hxx>
+#include <BitmapFastScaleFilter.hxx>
+
+BitmapEx BitmapFastScaleFilter::execute(BitmapEx const& rBitmapEx)
+{
+    SAL_INFO("vcl.gdi", "BitmapFastScaleFilter::execute()");
+
+    Bitmap aBitmap(rBitmapEx.GetBitmap());
+
+    const Size aSizePix(aBitmap.GetSizePixel());
+    const long nNewWidth = FRound(aSizePix.Width() * mfScaleX);
+    const long nNewHeight = FRound(aSizePix.Height() * mfScaleY);
+    bool bRet = false;
+
+    SAL_INFO("vcl.gdi", "New width: " << nNewWidth << "\nNew height: " << nNewHeight);
+
+    if (nNewWidth && nNewHeight)
+    {
+        Bitmap::ScopedReadAccess pReadAcc(aBitmap);
+
+        if (pReadAcc)
+        {
+            Bitmap aNewBmp(Size(nNewWidth, nNewHeight), aBitmap.GetBitCount(),
+                           &pReadAcc->GetPalette());
+            BitmapScopedWriteAccess pWriteAcc(aNewBmp);
+
+            if (pWriteAcc)
+            {
+                const long nScanlineSize = pWriteAcc->GetScanlineSize();
+                const long nNewWidth1 = nNewWidth - 1;
+                const long nNewHeight1 = nNewHeight - 1;
+
+                if (nNewWidth1 && nNewHeight1)
+                {
+                    const double nWidth = pReadAcc->Width();
+                    const double nHeight = pReadAcc->Height();
+                    std::unique_ptr<long[]> pLutX(new long[nNewWidth]);
+                    std::unique_ptr<long[]> pLutY(new long[nNewHeight]);
+
+                    for (long nX = 0; nX < nNewWidth; nX++)
+                    {
+                        pLutX[nX] = long(nX * nWidth / nNewWidth);
+                    }
+
+                    for (long nY = 0; nY < nNewHeight; nY++)
+                    {
+                        pLutY[nY] = long(nY * nHeight / nNewHeight);
+                    }
+
+                    long nActY = 0;
+                    while (nActY < nNewHeight)
+                    {
+                        long nMapY = pLutY[nActY];
+                        Scanline pScanline = pWriteAcc->GetScanline(nActY);
+                        Scanline pScanlineRead = pReadAcc->GetScanline(nMapY);
+
+                        for (long nX = 0; nX < nNewWidth; nX++)
+                        {
+                            pWriteAcc->SetPixelOnData(
+                                pScanline, nX,
+                                pReadAcc->GetPixelFromData(pScanlineRead, pLutX[nX]));
+                        }
+
+                        while ((nActY < nNewHeight1) && (pLutY[nActY + 1] == nMapY))
+                        {
+                            memcpy(pWriteAcc->GetScanline(nActY + 1), pWriteAcc->GetScanline(nActY),
+                                   nScanlineSize);
+                            nActY++;
+                        }
+                        nActY++;
+                    }
+
+                    bRet = true;
+                }
+
+                pWriteAcc.reset();
+            }
+            pReadAcc.reset();
+
+            if (bRet)
+            {
+                aBitmap.ReassignWithSize(aNewBmp);
+                SAL_INFO("vcl.gdi", "Bitmap size: " << aBitmap.GetSizePixel());
+            }
+            else
+            {
+                SAL_WARN("vcl.gdi", "no resize");
+            }
+        }
+    }
+
+    Bitmap aMask(rBitmapEx.GetMask());
+
+    if (bRet && (rBitmapEx.GetTransparentType() == TransparentType::Bitmap) && !aMask.IsEmpty())
+        bRet = aMask.Scale(maSize, BmpScaleFlag::Fast);
+
+    SAL_WARN_IF(!aMask.IsEmpty() && aBitmap.GetSizePixel() != aMask.GetSizePixel(), "vcl",
+                "BitmapEx::Scale(): size mismatch for bitmap and alpha mask.");
+
+    if (bRet)
+        return BitmapEx(aBitmap, aMask);
+
+    return BitmapEx();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */