summaryrefslogtreecommitdiffstats
path: root/vcl/source/bitmap/salbmp.cxx
diff options
context:
space:
mode:
Diffstat (limited to 'vcl/source/bitmap/salbmp.cxx')
-rw-r--r--vcl/source/bitmap/salbmp.cxx334
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: */
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-04 23:17:42 +0000