diff options
Diffstat (limited to 'chromium/third_party/skia/src/core/Sk64.cpp')
| -rw-r--r-- | chromium/third_party/skia/src/core/Sk64.cpp | 345 |
1 files changed, 0 insertions, 345 deletions
diff --git a/chromium/third_party/skia/src/core/Sk64.cpp b/chromium/third_party/skia/src/core/Sk64.cpp deleted file mode 100644 index 54b30221c90..00000000000 --- a/chromium/third_party/skia/src/core/Sk64.cpp +++ /dev/null @@ -1,345 +0,0 @@ -/* - * Copyright 2006 The Android Open Source Project - * - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ - -#include "Sk64.h" -#include "SkMathPriv.h" - -#define shift_left(hi, lo) \ - hi = (hi << 1) | (lo >> 31); \ - lo <<= 1 - -#define shift_left_bits(hi, lo, bits) \ - SkASSERT((unsigned)(bits) < 31); \ - hi = (hi << (bits)) | (lo >> (32 - (bits))); \ - lo <<= (bits) - -////////////////////////////////////////////////////////////////////// - -int Sk64::getClzAbs() const -{ - int32_t hi = fHi; - uint32_t lo = fLo; - - // get abs - if (hi < 0) - { - hi = -hi - Sk32ToBool(lo); - lo = 0 - lo; - } - return hi ? SkCLZ(hi) : SkCLZ(lo) + 32; -} - -void Sk64::shiftLeft(unsigned bits) -{ - SkASSERT(bits <= 63); - if (bits == 0) - return; - - if (bits >= 32) - { - fHi = fLo << (bits - 32); - fLo = 0; - } - else - { - fHi = (fHi << bits) | (fLo >> (32 - bits)); - fLo <<= bits; - } -} - -int32_t Sk64::getShiftRight(unsigned bits) const -{ - SkASSERT(bits <= 63); - - if (bits == 0) - return fLo; - - if (bits >= 32) - return fHi >> (bits - 32); - else - { -#ifdef SK_DEBUG - int32_t tmp = fHi >> bits; - SkASSERT(tmp == 0 || tmp == -1); -#endif - return (fHi << (32 - bits)) | (fLo >> bits); - } -} - -void Sk64::shiftRight(unsigned bits) -{ - SkASSERT(bits <= 63); - if (bits == 0) - return; - - if (bits >= 32) - { - fLo = fHi >> (bits - 32); - fHi >>= 31; - } - else - { - fLo = (fHi << (32 - bits)) | (fLo >> bits); - fHi >>= bits; - } -} - -void Sk64::roundRight(unsigned bits) -{ - SkASSERT(bits <= 63); - if (bits) - { - Sk64 one; - one.set(1); - one.shiftLeft(bits - 1); - this->add(one); - this->shiftRight(bits); - } -} - -int Sk64::shiftToMake32() const -{ - int32_t hi = fHi; - uint32_t lo = fLo; - - if (hi < 0) // make it positive - { - hi = -hi - Sk32ToBool(lo); - lo = 0 - lo; - } - - if (hi == 0) - return lo >> 31; - else - return 33 - SkCLZ(hi); -} - -void Sk64::negate() -{ - fHi = -fHi - Sk32ToBool(fLo); - fLo = 0 - fLo; -} - -void Sk64::abs() -{ - if (fHi < 0) - { - fHi = -fHi - Sk32ToBool(fLo); - fLo = 0 - fLo; - } -} - -SkBool Sk64::isFixed() const -{ - Sk64 tmp = *this; - tmp.roundRight(16); - return tmp.is32(); -} - -SkFract Sk64::getFract() const -{ - Sk64 tmp = *this; - tmp.roundRight(30); - return tmp.get32(); -} - -void Sk64::sub(const Sk64& a) -{ - fHi = fHi - a.fHi - (fLo < a.fLo); - fLo = fLo - a.fLo; -} - -void Sk64::rsub(const Sk64& a) -{ - fHi = a.fHi - fHi - (a.fLo < fLo); - fLo = a.fLo - fLo; -} - -void Sk64::setMul(int32_t a, int32_t b) -{ - int sa = a >> 31; - int sb = b >> 31; - // now make them positive - a = (a ^ sa) - sa; - b = (b ^ sb) - sb; - - uint32_t ah = a >> 16; - uint32_t al = a & 0xFFFF; - uint32_t bh = b >> 16; - uint32_t bl = b & 0xFFFF; - - uint32_t A = ah * bh; - uint32_t B = ah * bl + al * bh; - uint32_t C = al * bl; - - /* [ A ] - [ B ] - [ C ] - */ - fLo = C + (B << 16); - fHi = A + (B >>16) + (fLo < C); - - if (sa != sb) - this->negate(); -} - -void Sk64::div(int32_t denom, DivOptions option) -{ - SkASSERT(denom); - - int32_t hi = fHi; - uint32_t lo = fLo; - int sign = denom ^ hi; - - denom = SkAbs32(denom); - if (hi < 0) - { - hi = -hi - Sk32ToBool(lo); - lo = 0 - lo; - } - - if (option == kRound_DivOption) // add denom/2 - { - uint32_t newLo = lo + (denom >> 1); - hi += (newLo < lo); - lo = newLo; - } - - if (hi == 0) // fast-case - { - if (lo < (uint32_t)denom) - this->set(0, 0); - else - { - this->set(0, lo / denom); - if (sign < 0) - this->negate(); - } - return; - } - - int bits; - - { - int dbits = SkCLZ(denom); - int nbits = SkCLZ(hi); - - bits = 32 + dbits - nbits; - SkASSERT(bits <= 63); - if (bits <= 0) - { - this->set(0, 0); - return; - } - denom <<= (dbits - 1); - shift_left_bits(hi, lo, nbits - 1); - } - - int32_t rhi = 0; - uint32_t rlo = 0; - - do { - shift_left(rhi, rlo); - if ((uint32_t)denom <= (uint32_t)hi) - { - hi -= denom; - rlo |= 1; - } - shift_left(hi, lo); - } while (--bits >= 0); - SkASSERT(rhi >= 0); - - fHi = rhi; - fLo = rlo; - if (sign < 0) - this->negate(); -} - -#define shift_left_2(a, b, c) \ - a = (a << 2) | (b >> 30); \ - b = (b << 2) | (c >> 30); \ - c <<= 2 - -int32_t Sk64::getSqrt() const -{ - SkASSERT(!this->isNeg()); - - uint32_t hi = fHi; - uint32_t lo = fLo; - uint32_t sqr = 0; - uint32_t root = 0; - int count = 31; - - do { - root <<= 1; - shift_left_2(sqr, hi, lo); - - uint32_t testDiv = (root << 1) + 1; - if (sqr >= testDiv) - { - sqr -= testDiv; - root++; - } - } while (--count >= 0); - SkASSERT((int32_t)root >= 0); - - return root; -} - -#ifdef SkLONGLONG - SkLONGLONG Sk64::getLongLong() const - { - SkLONGLONG value = fHi; - value <<= 32; - return value | fLo; - } -#endif - -SkFixed Sk64::getFixedDiv(const Sk64& denom) const -{ - Sk64 N = *this; - Sk64 D = denom; - int32_t sign = SkExtractSign(N.fHi ^ D.fHi); - SkFixed result; - - N.abs(); - D.abs(); - - // need to knock D down to just 31 bits - // either by rounding it to the right, or shifting N to the left - // then we can just call 64/32 div - - int nclz = N.fHi ? SkCLZ(N.fHi) : 32; - int dclz = D.fHi ? SkCLZ(D.fHi) : (33 - (D.fLo >> 31)); - - int shiftN = nclz - 1; - SkASSERT(shiftN >= 0); - int shiftD = 33 - dclz; - SkASSERT(shiftD >= 0); - - if (shiftD + shiftN < 16) - shiftD = 16 - shiftN; - else - shiftN = 16 - shiftD; - - D.roundRight(shiftD); - if (D.isZero()) - result = SK_MaxS32; - else - { - if (shiftN >= 0) - N.shiftLeft(shiftN); - else - N.roundRight(-shiftN); - N.div(D.get32(), Sk64::kTrunc_DivOption); - if (N.is32()) - result = N.get32(); - else - result = SK_MaxS32; - } - return SkApplySign(result, sign); -} |