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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/.
*
*/
#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: */
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