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, 334 insertions, 0 deletions

diff --git a/vcl/source/bitmap/salbmp.cxx b/vcl/source/bitmap/salbmp.cxx
new file mode 100644
index 000000000..a1fc7de7a
--- /dev/null
+++ b/vcl/source/bitmap/salbmp.cxx
@@ -0,0 +1,334 @@
+/* -*- 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 <salbmp.hxx>
+#include <o3tl/enumarray.hxx>
+
+static BitmapChecksum scanlineChecksum(BitmapChecksum nCrc, const sal_uInt8* bits, int lineBitsCount, sal_uInt8 extraBitsMask)
+{
+    if( lineBitsCount / 8 > 0 )
+        nCrc = vcl_get_checksum( nCrc, bits, lineBitsCount / 8 );
+    if( extraBitsMask != 0 )
+    {
+        sal_uInt8 extraByte = bits[ lineBitsCount / 8 ] & extraBitsMask;
+        nCrc = vcl_get_checksum( nCrc, &extraByte, 1 );
+    }
+    return nCrc;
+}
+
+void SalBitmap::updateChecksum() const
+{
+    if (mbChecksumValid)
+        return;
+
+    BitmapChecksum nCrc = 0;
+    SalBitmap* pThis = const_cast<SalBitmap*>(this);
+    BitmapBuffer* pBuf = pThis->AcquireBuffer(BitmapAccessMode::Read);
+    if (pBuf)
+    {
+        nCrc = pBuf->maPalette.GetChecksum();
+        const int lineBitsCount = pBuf->mnWidth * pBuf->mnBitCount;
+        // With 1bpp/4bpp format we need to check only used bits in the last byte.
+        sal_uInt8 extraBitsMask = 0;
+        if( lineBitsCount % 8 != 0 )
+        {
+            const int extraBitsCount = lineBitsCount % 8;
+            switch( RemoveScanline( pBuf->mnFormat ))
+            {
+                case ScanlineFormat::N1BitMsbPal:
+                {
+                    static const sal_uInt8 mask1Bit[] = { 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
+                    extraBitsMask = mask1Bit[ extraBitsCount ];
+                    break;
+                }
+                case ScanlineFormat::N1BitLsbPal:
+                {
+                    static const sal_uInt8 mask1Bit[] = { 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff };
+                    extraBitsMask = mask1Bit[ extraBitsCount ];
+                    break;
+                }
+                default:
+                    break;
+            }
+        }
+        if( pBuf->mnFormat & ScanlineFormat::TopDown )
+        {
+            if( pBuf->mnScanlineSize == lineBitsCount / 8 )
+                nCrc = vcl_get_checksum(nCrc, pBuf->mpBits, pBuf->mnScanlineSize * pBuf->mnHeight);
+            else // Do not include padding with undefined content in the checksum.
+                for( tools::Long y = 0; y < pBuf->mnHeight; ++y )
+                    nCrc = scanlineChecksum(nCrc, pBuf->mpBits + y * pBuf->mnScanlineSize, lineBitsCount, extraBitsMask);
+        }
+        else // Compute checksum in the order of scanlines, to make it consistent between different bitmap implementations.
+        {
+            for( tools::Long y = pBuf->mnHeight - 1; y >= 0; --y )
+                nCrc = scanlineChecksum(nCrc, pBuf->mpBits + y * pBuf->mnScanlineSize, lineBitsCount, extraBitsMask);
+        }
+        pThis->ReleaseBuffer(pBuf, BitmapAccessMode::Read);
+        pThis->mnChecksum = nCrc;
+        pThis->mbChecksumValid = true;
+    }
+    else
+    {
+        pThis->mbChecksumValid = false;
+    }
+}
+
+namespace
+{
+
+class ImplPixelFormat
+{
+protected:
+    const sal_uInt8* mpData;
+public:
+    static ImplPixelFormat* GetFormat( sal_uInt16 nBits, const BitmapPalette& rPalette );
+
+    virtual void StartLine( const sal_uInt8* pLine ) { mpData = pLine; }
+    virtual const BitmapColor& ReadPixel() = 0;
+    virtual ~ImplPixelFormat() { }
+};
+
+class ImplPixelFormat8 : public ImplPixelFormat
+{
+private:
+    const BitmapPalette& mrPalette;
+
+public:
+    explicit ImplPixelFormat8( const BitmapPalette& rPalette )
+    : mrPalette( rPalette )
+    {
+    }
+    virtual const BitmapColor& ReadPixel() override
+    {
+        assert( mrPalette.GetEntryCount() > *mpData );
+        return mrPalette[ *mpData++ ];
+    }
+};
+
+class ImplPixelFormat4 : public ImplPixelFormat
+{
+private:
+    const BitmapPalette& mrPalette;
+    sal_uInt32 mnX;
+    sal_uInt32 mnShift;
+
+public:
+    explicit ImplPixelFormat4( const BitmapPalette& rPalette )
+        : mrPalette( rPalette )
+        , mnX(0)
+        , mnShift(4)
+    {
+    }
+    virtual void StartLine( const sal_uInt8* pLine ) override
+    {
+        mpData = pLine;
+        mnX = 0;
+        mnShift = 4;
+    }
+    virtual const BitmapColor& ReadPixel() override
+    {
+        sal_uInt32 nIdx = ( mpData[mnX >> 1] >> mnShift) & 0x0f;
+        assert( mrPalette.GetEntryCount() > nIdx );
+        const BitmapColor& rColor = mrPalette[nIdx];
+        mnX++;
+        mnShift ^= 4;
+        return rColor;
+    }
+};
+
+class ImplPixelFormat1 : public ImplPixelFormat
+{
+private:
+    const BitmapPalette& mrPalette;
+    sal_uInt32 mnX;
+
+public:
+    explicit ImplPixelFormat1( const BitmapPalette& rPalette )
+        : mrPalette(rPalette)
+        , mnX(0)
+    {
+    }
+    virtual void StartLine( const sal_uInt8* pLine ) override
+    {
+        mpData = pLine;
+        mnX = 0;
+    }
+    virtual const BitmapColor& ReadPixel() override
+    {
+        const BitmapColor& rColor = mrPalette[ (mpData[mnX >> 3 ] >> ( 7 - ( mnX & 7 ) )) & 1];
+        mnX++;
+        return rColor;
+    }
+};
+
+ImplPixelFormat* ImplPixelFormat::GetFormat( sal_uInt16 nBits, const BitmapPalette& rPalette )
+{
+    switch( nBits )
+    {
+    case 1: return new ImplPixelFormat1( rPalette );
+    case 4: return new ImplPixelFormat4( rPalette );
+    case 8: return new ImplPixelFormat8( rPalette );
+    }
+
+    return nullptr;
+}
+
+// Optimized conversion from 1bpp. Currently LO uses 1bpp bitmaps for masks, which is nowadays
+// a lousy obsolete format, as the memory saved is just not worth the cost of fiddling with the bits.
+// Ideally LO should move to RGBA bitmaps. Until then, try to be faster with 1bpp bitmaps.
+typedef void(*WriteColorFunction)( sal_uInt8 color8Bit, sal_uInt8*& dst );
+void writeColorA8(sal_uInt8 color8Bit, sal_uInt8*& dst ) { *dst++ = color8Bit; };
+void writeColorRGBA(sal_uInt8 color8Bit, sal_uInt8*& dst ) { *dst++ = color8Bit; *dst++ = color8Bit; *dst++ = color8Bit; *dst++ = 0xff; };
+typedef void(*WriteBlackWhiteFunction)( sal_uInt8*& dst, int count );
+void writeBlackA8(sal_uInt8*& dst, int count ) { memset( dst, 0, count ); dst += count; };
+void writeWhiteA8(sal_uInt8*& dst, int count ) { memset( dst, 0xff, count ); dst += count; };
+void writeWhiteRGBA(sal_uInt8*& dst, int count ) { memset( dst, 0xff, count * 4 ); dst += count * 4; };
+void writeBlackRGBA(sal_uInt8*& dst, int count )
+{
+    for( int i = 0; i < count; ++i )
+    {
+        dst[0] = 0x00;
+        dst[1] = 0x00;
+        dst[2] = 0x00;
+        dst[3] = 0xff;
+        dst += 4;
+    }
+};
+
+template< WriteColorFunction func, WriteBlackWhiteFunction funcBlack, WriteBlackWhiteFunction funcWhite >
+void writeBlackWhiteData( const sal_uInt8* src, sal_uInt8* dst, int width, int height, int bytesPerRow )
+{
+    for( int y = 0; y < height; ++y )
+    {
+        const sal_uInt8* srcLine = src;
+        int xsize = width;
+        while( xsize >= 64 )
+        {
+            // TODO alignment?
+            const sal_uInt64* src64 = reinterpret_cast< const sal_uInt64* >( src );
+            if( *src64 == 0x00 )
+                funcBlack( dst, 64 );
+            else if( *src64 == static_cast< sal_uInt64 >( -1 ))
+                funcWhite( dst, 64 );
+            else
+                break;
+            src += sizeof( sal_uInt64 );
+            xsize -= 64;
+        }
+        while( xsize >= 8 )
+        {
+            if( *src == 0x00 ) // => eight black pixels
+                funcBlack( dst, 8 );
+            else if( *src == 0xff ) // => eight white pixels
+                funcWhite( dst, 8 );
+            else
+                for( int bit = 7; bit >= 0; --bit )
+                    func(( *src >> bit ) & 1 ? 0xff : 0, dst );
+            ++src;
+            xsize -= 8;
+        }
+        for( int bit = 7; bit > 7 - xsize; --bit )
+            func(( *src >> bit ) & 1 ? 0xff : 0, dst );
+        ++src;
+        src = srcLine + bytesPerRow;
+    }
+}
+
+} // namespace
+
+std::unique_ptr< sal_uInt8[] > SalBitmap::convertDataBitCount( const sal_uInt8* src,
+    int width, int height, int bitCount, int bytesPerRow, const BitmapPalette& palette, BitConvert type )
+{
+    assert( bitCount == 1 || bitCount == 4 || bitCount == 8 );
+    static const o3tl::enumarray<BitConvert, int> bpp = { 1, 4, 4 };
+    std::unique_ptr< sal_uInt8[] > data( new sal_uInt8[width * height * bpp[ type ]] );
+
+    if(type == BitConvert::A8 && bitCount == 8 && palette.IsGreyPalette8Bit())
+    { // no actual data conversion
+        for( int y = 0; y < height; ++y )
+            memcpy( data.get() + y * width, src + y * bytesPerRow, width );
+        return data;
+    }
+
+    if(bitCount == 1 && palette.GetEntryCount() == 2 && palette[ 0 ] == COL_BLACK && palette[ 1 ] == COL_WHITE)
+    {
+        switch( type )
+        {
+            case BitConvert::A8 :
+                writeBlackWhiteData< writeColorA8, writeBlackA8, writeWhiteA8 >
+                    ( src, data.get(), width, height, bytesPerRow );
+                return data;
+            case BitConvert::BGRA :
+            case BitConvert::RGBA :
+                // BGRA/RGBA is the same, all 3 values get the same value
+                writeBlackWhiteData< writeColorRGBA, writeBlackRGBA, writeWhiteRGBA >
+                    ( src, data.get(), width, height, bytesPerRow );
+                return data;
+        }
+    }
+
+    std::unique_ptr<ImplPixelFormat> pSrcFormat(ImplPixelFormat::GetFormat(bitCount, palette));
+
+    const sal_uInt8* pSrcData = src;
+    sal_uInt8* pDstData = data.get();
+
+    sal_uInt32 nY = height;
+    while( nY-- )
+    {
+        pSrcFormat->StartLine( pSrcData );
+
+        sal_uInt32 nX = width;
+        switch( type )
+        {
+            case BitConvert::A8 :
+                while( nX-- )
+                {
+                    const BitmapColor& c = pSrcFormat->ReadPixel();
+                    *pDstData++ = c.GetBlue();
+                }
+                break;
+            case BitConvert::BGRA :
+                while( nX-- )
+                {
+                    const BitmapColor& c = pSrcFormat->ReadPixel();
+                    *pDstData++ = c.GetBlue();
+                    *pDstData++ = c.GetGreen();
+                    *pDstData++ = c.GetRed();
+                    *pDstData++ = 0xff;
+                }
+                break;
+            case BitConvert::RGBA :
+                while( nX-- )
+                {
+                    const BitmapColor& c = pSrcFormat->ReadPixel();
+                    *pDstData++ = c.GetRed();
+                    *pDstData++ = c.GetGreen();
+                    *pDstData++ = c.GetBlue();
+                    *pDstData++ = 0xff;
+                }
+                break;
+        }
+
+        pSrcData += bytesPerRow;
+    }
+    return data;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */