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Diffstat (limited to 'Build/source/libs/xpdf/goo/FixedPoint.cc')
-rw-r--r-- | Build/source/libs/xpdf/goo/FixedPoint.cc | 118 |
1 files changed, 0 insertions, 118 deletions
diff --git a/Build/source/libs/xpdf/goo/FixedPoint.cc b/Build/source/libs/xpdf/goo/FixedPoint.cc deleted file mode 100644 index 47c2834a34b..00000000000 --- a/Build/source/libs/xpdf/goo/FixedPoint.cc +++ /dev/null @@ -1,118 +0,0 @@ -//======================================================================== -// -// FixedPoint.cc -// -// Fixed point type, with C++ operators. -// -// Copyright 2004 Glyph & Cog, LLC -// -//======================================================================== - -#include <aconf.h> - -#if USE_FIXEDPOINT - -#ifdef USE_GCC_PRAGMAS -#pragma implementation -#endif - -#include "FixedPoint.h" - -#define ln2 ((FixedPoint)0.69314718) - -FixedPoint FixedPoint::sqrt(FixedPoint x) { - FixedPoint y0, y1, z; - - if (x.val <= 0) { - y1.val = 0; - } else { - y1.val = x.val == 1 ? 2 : x.val >> 1; - do { - y0.val = y1.val; - z = x / y0; - y1.val = (y0.val + z.val) >> 1; - } while (::abs(y0.val - y1.val) > 1); - } - return y1; -} - -FixedPoint FixedPoint::pow(FixedPoint x, FixedPoint y) { - FixedPoint t, t2, lnx0, lnx, z0, z; - int d, n, i; - - if (y.val <= 0) { - z.val = 0; - } else { - // y * ln(x) - t = (x - 1) / (x + 1); - t2 = t * t; - d = 1; - lnx = 0; - do { - lnx0 = lnx; - lnx += t / d; - t *= t2; - d += 2; - } while (::abs(lnx.val - lnx0.val) > 2); - lnx.val <<= 1; - t = y * lnx; - // exp(y * ln(x)) - n = floor(t / ln2); - t -= ln2 * n; - t2 = t; - d = 1; - i = 1; - z = 1; - do { - z0 = z; - z += t2 / d; - t2 *= t; - ++i; - d *= i; - } while (::abs(z.val - z0.val) > 2 && d < (1 << fixptShift)); - if (n >= 0) { - z.val <<= n; - } else if (n < 0) { - z.val >>= -n; - } - } - return z; -} - -int FixedPoint::mul(int x, int y) { -#if 1 //~tmp - return ((FixPtInt64)x * y) >> fixptShift; -#else - int ah0, ah, bh, al, bl; - ah0 = x & fixptMaskH; - ah = x >> fixptShift; - al = x - ah0; - bh = y >> fixptShift; - bl = y - (bh << fixptShift); - return ah0 * bh + ah * bl + al * bh + ((al * bl) >> fixptShift); -#endif -} - -int FixedPoint::div(int x, int y) { -#if 1 //~tmp - return ((FixPtInt64)x << fixptShift) / y; -#else -#endif -} - -GBool FixedPoint::divCheck(FixedPoint x, FixedPoint y, FixedPoint *result) { -#if 1 //~tmp - FixPtInt64 z; - - z = ((FixPtInt64)x.val << fixptShift) / y.val; - if ((z == 0 && x != 0) || - z >= ((FixPtInt64)1 << 31) || z < -((FixPtInt64)1 << 31)) { - return gFalse; - } - result->val = z; - return gTrue; -#else -#endif -} - -#endif // USE_FIXEDPOINT |