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If not, see * * for a copy of the LGPLv3 License. * ************************************************************************/ // MARKER(update_precomp.py): autogen include statement, do not remove #include "precompiled_vcl.hxx" #include #include //------------------------------------------------------------------------ RawBitmap::RawBitmap() : mpBits(0), mnAllocated(0) {} //------------------------------------------------------------------------ RawBitmap::~RawBitmap() { delete[] mpBits; mpBits = 0; mnAllocated = 0; } //------------------------------------------------------------------------ // used by 90 and 270 degree rotations on 8 bit deep bitmaps static void ImplRotate8_90( unsigned char* p1, const unsigned char* p2, int xmax, int ymax, int dx, int dy, int nPad ) { for( int y = ymax; --y >= 0; p2 += dy ) { for( int x = xmax; --x >= 0; p2 += dx ) *(p1++) = *p2; for( int i = nPad; --i >= 0; ) *(p1++) = 0; } } //------------------------------------------------------------------------ // used by inplace 180 degree rotation on 8 bit deep bitmaps static void ImplRotate8_180( unsigned char* p1, int xmax, int ymax, int nPad ) { unsigned char* p2 = p1 + ymax * (xmax + nPad); for( int y = ymax/2; --y >= 0; ) { p2 -= nPad; for( int x = xmax; --x >= 0; ) { unsigned char cTmp = *(--p2); *p2 = *p1; *(p1++) = cTmp; } p1 += nPad; } // reverse middle line p2 -= nPad; while( p1 < p2 ) { unsigned char cTmp = *(--p2); *p2 = *p1; *(p1++) = cTmp; } } //------------------------------------------------------------------------ // used by 90 or 270 degree rotations on 1 bit deep bitmaps static void ImplRotate1_90( unsigned char* p1, const unsigned char* p2, int xmax, int ymax, int dx, int nShift, int nDeltaShift, int nPad ) { for( int y = ymax; --y >= 0; ) { unsigned nTemp = 1; const unsigned char* p20 = p2; for( int x = xmax; --x >= 0; p2 += dx ) { // build bitwise and store when byte finished nTemp += nTemp + ((*p2 >> nShift) & 1); if( nTemp >= 0x100U ) { *(p1++) = (unsigned char)nTemp; nTemp = 1; } } p2 = p20; // store left aligned remainder if needed if( nTemp > 1 ) { for(; nTemp < 0x100U; nTemp += nTemp ) ; *(p1++) = (unsigned char)nTemp; } // pad scanline with zeroes for( int i = nPad; --i >= 0;) *(p1++) = 0; // increase/decrease shift, but keep bound inside 0 to 7 nShift += nDeltaShift; if( nShift != (nShift & 7) ) p2 -= nDeltaShift; nShift &= 7; } } //------------------------------------------------------------------------ // used by 180 degrees rotations on 1 bit deep bitmaps static void ImplRotate1_180( unsigned char* p1, const unsigned char* p2, int xmax, int ymax, int nPad ) { --p2; for( int y = ymax; --y >= 0; ) { p2 -= nPad; unsigned nTemp = 1; unsigned nInp = (0x100 + *p2) >> (-xmax & 7); for( int x = xmax; --x >= 0; ) { // build bitwise and store when byte finished nTemp += nTemp + (nInp & 1); if( nTemp >= 0x100 ) { *(p1++) = (unsigned char)nTemp; nTemp = 1; } // update input byte if needed (and available) if( (nInp >>= 1) <= 1 && ((y != 0) || (x != 0)) ) nInp = 0x100 + *(--p2); } // store left aligned remainder if needed if( nTemp > 1 ) { for(; nTemp < 0x100; nTemp += nTemp ) ; *(p1++) = (unsigned char)nTemp; } // scanline pad is already clean p1 += nPad; } } //------------------------------------------------------------------------ bool RawBitmap::Rotate( int nAngle ) { ULONG nNewScanlineSize = 0; ULONG nNewHeight = 0; ULONG nNewWidth = 0; // do inplace rotation or prepare double buffered rotation switch( nAngle ) { case 0: // nothing to do case 3600: return true; default: // non rectangular angles not allowed return false; case 1800: // rotate by 180 degrees mnXOffset = -(mnXOffset + mnWidth); mnYOffset = -(mnYOffset + mnHeight); if( mnBitCount == 8 ) { ImplRotate8_180( mpBits, mnWidth, mnHeight, mnScanlineSize-mnWidth ); return true; } nNewWidth = mnWidth; nNewHeight = mnHeight; nNewScanlineSize = mnScanlineSize; break; case +900: // left by 90 degrees case -900: case 2700: // right by 90 degrees nNewWidth = mnHeight; nNewHeight = mnWidth; if( mnBitCount==1 ) nNewScanlineSize = (nNewWidth + 7) / 8; else nNewScanlineSize = (nNewWidth + 3) & -4; break; } unsigned int nBufSize = nNewHeight * nNewScanlineSize; unsigned char* pBuf = new unsigned char[ nBufSize ]; if( !pBuf ) return false; memset( pBuf, 0, nBufSize ); int i; // dispatch non-inplace rotations switch( nAngle ) { case 1800: // rotate by 180 degrees // we know we only need to deal with 1 bit depth ImplRotate1_180( pBuf, mpBits + mnHeight * mnScanlineSize, mnWidth, mnHeight, mnScanlineSize - (mnWidth + 7) / 8 ); break; case +900: // rotate left by 90 degrees i = mnXOffset; mnXOffset = mnYOffset; mnYOffset = -nNewHeight - i; if( mnBitCount == 8 ) ImplRotate8_90( pBuf, mpBits + mnWidth - 1, nNewWidth, nNewHeight, +mnScanlineSize, -1-mnHeight*mnScanlineSize, nNewScanlineSize - nNewWidth ); else ImplRotate1_90( pBuf, mpBits + (mnWidth - 1) / 8, nNewWidth, nNewHeight, +mnScanlineSize, (-mnWidth & 7), +1, nNewScanlineSize - (nNewWidth + 7) / 8 ); break; case 2700: // rotate right by 90 degrees case -900: i = mnXOffset; mnXOffset = -(nNewWidth + mnYOffset); mnYOffset = i; if( mnBitCount == 8 ) ImplRotate8_90( pBuf, mpBits + mnScanlineSize * (mnHeight-1), nNewWidth, nNewHeight, -mnScanlineSize, +1+mnHeight*mnScanlineSize, nNewScanlineSize - nNewWidth ); else ImplRotate1_90( pBuf, mpBits + mnScanlineSize * (mnHeight-1), nNewWidth, nNewHeight, -mnScanlineSize, +7, -1, nNewScanlineSize - (nNewWidth + 7) / 8 ); break; } mnWidth = nNewWidth; mnHeight = nNewHeight; mnScanlineSize = nNewScanlineSize; if( nBufSize < mnAllocated ) { memcpy( mpBits, pBuf, nBufSize ); delete[] pBuf; } else { delete[] mpBits; mpBits = pBuf; mnAllocated = nBufSize; } return true; } //------------------------------------------------------------------------