Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 236 insertions, 0 deletions

diff --git a/vcl/inc/bitmap/ScanlineTools.hxx b/vcl/inc/bitmap/ScanlineTools.hxx
new file mode 100644
index 000000000..c343cf34f
--- /dev/null
+++ b/vcl/inc/bitmap/ScanlineTools.hxx
@@ -0,0 +1,236 @@
+/* -*- 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/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_INC_BITMAP_SCANLINETOOLS_HXX
+#define INCLUDED_VCL_INC_BITMAP_SCANLINETOOLS_HXX
+
+#include <tools/color.hxx>
+#include <vcl/BitmapPalette.hxx>
+
+namespace vcl::bitmap
+{
+class ScanlineTransformer
+{
+public:
+    virtual void startLine(sal_uInt8* pLine) = 0;
+    virtual void skipPixel(sal_uInt32 nPixel) = 0;
+    virtual Color readPixel() = 0;
+    virtual void writePixel(Color nColor) = 0;
+
+    virtual ~ScanlineTransformer() = default;
+};
+
+class ScanlineTransformer_ARGB final : public ScanlineTransformer
+{
+private:
+    sal_uInt8* pData;
+
+public:
+    virtual void startLine(sal_uInt8* pLine) override { pData = pLine; }
+
+    virtual void skipPixel(sal_uInt32 nPixel) override { pData += nPixel << 2; }
+
+    virtual Color readPixel() override
+    {
+        const Color aColor(ColorTransparency, pData[4], pData[1], pData[2], pData[3]);
+        pData += 4;
+        return aColor;
+    }
+
+    virtual void writePixel(Color nColor) override
+    {
+        *pData++ = 255 - nColor.GetAlpha();
+        *pData++ = nColor.GetRed();
+        *pData++ = nColor.GetGreen();
+        *pData++ = nColor.GetBlue();
+    }
+};
+
+class ScanlineTransformer_BGR final : public ScanlineTransformer
+{
+private:
+    sal_uInt8* pData;
+
+public:
+    virtual void startLine(sal_uInt8* pLine) override { pData = pLine; }
+
+    virtual void skipPixel(sal_uInt32 nPixel) override { pData += (nPixel << 1) + nPixel; }
+
+    virtual Color readPixel() override
+    {
+        const Color aColor(pData[2], pData[1], pData[0]);
+        pData += 3;
+        return aColor;
+    }
+
+    virtual void writePixel(Color nColor) override
+    {
+        *pData++ = nColor.GetBlue();
+        *pData++ = nColor.GetGreen();
+        *pData++ = nColor.GetRed();
+    }
+};
+
+class ScanlineTransformer_8BitPalette final : public ScanlineTransformer
+{
+private:
+    sal_uInt8* pData;
+    const BitmapPalette& mrPalette;
+
+public:
+    explicit ScanlineTransformer_8BitPalette(const BitmapPalette& rPalette)
+        : pData(nullptr)
+        , mrPalette(rPalette)
+    {
+    }
+
+    virtual void startLine(sal_uInt8* pLine) override { pData = pLine; }
+
+    virtual void skipPixel(sal_uInt32 nPixel) override { pData += nPixel; }
+
+    virtual Color readPixel() override
+    {
+        const sal_uInt8 nIndex(*pData++);
+        if (nIndex < mrPalette.GetEntryCount())
+            return mrPalette[nIndex];
+        else
+            return COL_BLACK;
+    }
+
+    virtual void writePixel(Color nColor) override
+    {
+        *pData++ = static_cast<sal_uInt8>(mrPalette.GetBestIndex(nColor));
+    }
+};
+
+class ScanlineTransformer_4BitPalette final : public ScanlineTransformer
+{
+private:
+    sal_uInt8* pData;
+    const BitmapPalette& mrPalette;
+    sal_uInt32 mnX;
+    sal_uInt32 mnShift;
+
+public:
+    explicit ScanlineTransformer_4BitPalette(const BitmapPalette& rPalette)
+        : pData(nullptr)
+        , mrPalette(rPalette)
+        , mnX(0)
+        , mnShift(0)
+    {
+    }
+
+    virtual void skipPixel(sal_uInt32 nPixel) override
+    {
+        mnX += nPixel;
+        if (nPixel & 1) // is nPixel an odd number
+            mnShift ^= 4;
+    }
+
+    virtual void startLine(sal_uInt8* pLine) override
+    {
+        pData = pLine;
+        mnX = 0;
+        mnShift = 4;
+    }
+
+    virtual Color readPixel() override
+    {
+        const sal_uInt32 nDataIndex = mnX / 2;
+        const sal_uInt8 nIndex((pData[nDataIndex] >> mnShift) & 0x0f);
+        mnX++;
+        mnShift ^= 4;
+
+        if (nIndex < mrPalette.GetEntryCount())
+            return mrPalette[nIndex];
+        else
+            return COL_BLACK;
+    }
+
+    virtual void writePixel(Color nColor) override
+    {
+        const sal_uInt32 nDataIndex = mnX / 2;
+        const sal_uInt8 nColorIndex = mrPalette.GetBestIndex(nColor);
+        pData[nDataIndex] |= (nColorIndex & 0x0f) << mnShift;
+        mnX++;
+        mnShift ^= 4;
+    }
+};
+
+class ScanlineTransformer_1BitPalette final : public ScanlineTransformer
+{
+private:
+    sal_uInt8* pData;
+    const BitmapPalette& mrPalette;
+    sal_uInt32 mnX;
+
+public:
+    explicit ScanlineTransformer_1BitPalette(const BitmapPalette& rPalette)
+        : pData(nullptr)
+        , mrPalette(rPalette)
+        , mnX(0)
+    {
+    }
+
+    virtual void skipPixel(sal_uInt32 nPixel) override { mnX += nPixel; }
+
+    virtual void startLine(sal_uInt8* pLine) override
+    {
+        pData = pLine;
+        mnX = 0;
+    }
+
+    virtual Color readPixel() override
+    {
+        const sal_uInt8 nIndex((pData[mnX >> 3] >> (7 - (mnX & 7))) & 1);
+        mnX++;
+
+        if (nIndex < mrPalette.GetEntryCount())
+            return mrPalette[nIndex];
+        else
+            return COL_BLACK;
+    }
+
+    virtual void writePixel(Color nColor) override
+    {
+        if (mrPalette.GetBestIndex(nColor) & 1)
+            pData[mnX >> 3] |= 1 << (7 - (mnX & 7));
+        else
+            pData[mnX >> 3] &= ~(1 << (7 - (mnX & 7)));
+        mnX++;
+    }
+};
+
+std::unique_ptr<ScanlineTransformer> getScanlineTransformer(sal_uInt16 nBits,
+                                                            const BitmapPalette& rPalette)
+{
+    switch (nBits)
+    {
+        case 1:
+            return std::make_unique<ScanlineTransformer_1BitPalette>(rPalette);
+        case 4:
+            return std::make_unique<ScanlineTransformer_4BitPalette>(rPalette);
+        case 8:
+            return std::make_unique<ScanlineTransformer_8BitPalette>(rPalette);
+        case 24:
+            return std::make_unique<ScanlineTransformer_BGR>();
+        case 32:
+            return std::make_unique<ScanlineTransformer_ARGB>();
+        default:
+            assert(false);
+            break;
+    }
+    return nullptr;
+}
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */