remove unused SkFixed and SkFract functions

src/core/SkCordic.cpp

Index: src/core/SkCordic.cpp
diff --git a/src/core/SkCordic.cpp b/src/core/SkCordic.cpp
deleted file mode 100644
index 3adc92faa108fc7e2e3b30ce1963ceb4463cd491..0000000000000000000000000000000000000000
--- a/src/core/SkCordic.cpp
+++ /dev/null
@@ -1,289 +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 "SkCordic.h"
-#include "SkMathPriv.h"
-#include "Sk64.h"
-
-// 0x20000000 equals pi / 4
-const int32_t kATanDegrees[] = { 0x20000000,
-    0x12E4051D, 0x9FB385B, 0x51111D4, 0x28B0D43, 0x145D7E1, 0xA2F61E, 0x517C55,
-    0x28BE53, 0x145F2E, 0xA2F98, 0x517CC, 0x28BE6, 0x145F3, 0xA2F9, 0x517C,
-    0x28BE, 0x145F, 0xA2F, 0x517, 0x28B, 0x145, 0xA2, 0x51, 0x28, 0x14,
-    0xA, 0x5, 0x2, 0x1 };
-
-const int32_t kFixedInvGain1 = 0x18bde0bb;  // 0.607252935
-
-static void SkCircularRotation(int32_t* x0, int32_t* y0, int32_t* z0)
-{
-    int32_t t = 0;
-    int32_t x = *x0;
-    int32_t y = *y0;
-    int32_t z = *z0;
-    const int32_t* tanPtr = kATanDegrees;
-   do {
-        int32_t x1 = y >> t;
-        int32_t y1 = x >> t;
-        int32_t tan = *tanPtr++;
-        if (z >= 0) {
-            x -= x1;
-            y += y1;
-            z -= tan;
-        } else {
-            x += x1;
-            y -= y1;
-            z += tan;
-        }
-   } while (++t < 16); // 30);
-    *x0 = x;
-    *y0 = y;
-    *z0 = z;
-}
-
-SkFixed SkCordicSinCos(SkFixed radians, SkFixed* cosp)
-{
-    int32_t scaledRadians = radians * 0x28be;   // scale radians to 65536 / PI()
-    int quadrant = scaledRadians >> 30;
-    quadrant += 1;
-    if (quadrant & 2)
-        scaledRadians = -scaledRadians + 0x80000000;
-    /* |a| <= 90 degrees as a 1.31 number */
-    SkFixed sin = 0;
-    SkFixed cos = kFixedInvGain1;
-    SkCircularRotation(&cos, &sin, &scaledRadians);
-    Sk64 scaled;
-    scaled.setMul(sin, 0x6488d);
-    sin = scaled.fHi;
-    scaled.setMul(cos, 0x6488d);
-    if (quadrant & 2)
-        scaled.fHi = - scaled.fHi;
-    *cosp = scaled.fHi;
-    return sin;
-}
-
-SkFixed SkCordicTan(SkFixed a)
-{
-    int32_t cos;
-    int32_t sin = SkCordicSinCos(a, &cos);
-    return SkFixedDiv(sin, cos);
-}
-
-static int32_t SkCircularVector(int32_t* y0, int32_t* x0, int32_t vecMode)
-{
-    int32_t x = *x0;
-    int32_t y = *y0;
-    int32_t z = 0;
-    int32_t t = 0;
-    const int32_t* tanPtr = kATanDegrees;
-   do {
-        int32_t x1 = y >> t;
-        int32_t y1 = x >> t;
-        int32_t tan = *tanPtr++;
-        if (y < vecMode) {
-            x -= x1;
-            y += y1;
-            z -= tan;
-        } else {
-            x += x1;
-            y -= y1;
-            z += tan;
-        }
-   } while (++t < 16);  // 30
-    Sk64 scaled;
-    scaled.setMul(z, 0x6488d); // scale back into the SkScalar space (0x100000000/0x28be)
-   return scaled.fHi;
-}
-
-SkFixed SkCordicASin(SkFixed a) {
-    int32_t sign = SkExtractSign(a);
-    int32_t z = SkFixedAbs(a);
-    if (z >= SK_Fixed1)
-        return SkApplySign(SK_FixedPI>>1, sign);
-    int32_t x = kFixedInvGain1;
-    int32_t y = 0;
-    z *= 0x28be;
-    z = SkCircularVector(&y, &x, z);
-    z = SkApplySign(z, ~sign);
-    return z;
-}
-
-SkFixed SkCordicACos(SkFixed a) {
-    int32_t z = SkCordicASin(a);
-    z = (SK_FixedPI>>1) - z;
-    return z;
-}
-
-SkFixed SkCordicATan2(SkFixed y, SkFixed x) {
-    if ((x | y) == 0)
-        return 0;
-    int32_t xsign = SkExtractSign(x);
-    x = SkFixedAbs(x);
-    int32_t result = SkCircularVector(&y, &x, 0);
-    if (xsign) {
-        int32_t rsign = SkExtractSign(result);
-        if (y == 0)
-            rsign = 0;
-        SkFixed pi = SkApplySign(SK_FixedPI, rsign);
-        result = pi - result;
-    }
-    return result;
-}
-
-const int32_t kATanHDegrees[] = {
-    0x1661788D, 0xA680D61, 0x51EA6FC, 0x28CBFDD, 0x1460E34,
-    0xA2FCE8, 0x517D2E, 0x28BE6E, 0x145F32,
-    0xA2F98, 0x517CC, 0x28BE6, 0x145F3, 0xA2F9, 0x517C,
-    0x28BE, 0x145F, 0xA2F, 0x517, 0x28B, 0x145, 0xA2, 0x51, 0x28, 0x14,
-    0xA, 0x5, 0x2, 0x1 };
-
-const int32_t kFixedInvGain2 = 0x31330AAA;  // 1.207534495
-
-static void SkHyperbolic(int32_t* x0, int32_t* y0, int32_t* z0, int mode)
-{
-    int32_t t = 1;
-    int32_t x = *x0;
-    int32_t y = *y0;
-    int32_t z = *z0;
-    const int32_t* tanPtr = kATanHDegrees;
-    int k = -3;
-    do {
-        int32_t x1 = y >> t;
-        int32_t y1 = x >> t;
-        int32_t tan = *tanPtr++;
-        int count = 2 + (k >> 31);
-        if (++k == 1)
-            k = -2;
-        do {
-            if (((y >> 31) & mode) | ~((z >> 31) | mode)) {
-                x += x1;
-                y += y1;
-                z -= tan;
-            } else {
-                x -= x1;
-                y -= y1;
-                z += tan;
-            }
-        } while (--count);
-    } while (++t < 30);
-    *x0 = x;
-    *y0 = y;
-    *z0 = z;
-}
-
-SkFixed SkCordicLog(SkFixed a) {
-    a *= 0x28be;
-    int32_t x = a + 0x28BE60DB; // 1.0
-    int32_t y = a - 0x28BE60DB;
-    int32_t z = 0;
-    SkHyperbolic(&x, &y, &z, -1);
-    Sk64 scaled;
-    scaled.setMul(z, 0x6488d);
-    z = scaled.fHi;
-    return z << 1;
-}
-
-SkFixed SkCordicExp(SkFixed a) {
-    int32_t cosh = kFixedInvGain2;
-    int32_t sinh = 0;
-    SkHyperbolic(&cosh, &sinh, &a, 0);
-    return cosh + sinh;
-}
-
-#ifdef SK_DEBUG
-
-#include "SkFloatingPoint.h"
-
-void SkCordic_UnitTest()
-{
-#if defined(SK_SUPPORT_UNITTEST)
-    float val;
-    for (float angle = -720; angle < 720; angle += 30) {
-        float radian = angle * 3.1415925358f / 180.0f;
-        SkFixed f_angle = SkFloatToFixed(radian);
-    // sincos
-        float sine = sinf(radian);
-        float cosine = cosf(radian);
-        SkFixed f_cosine;
-        SkFixed f_sine = SkCordicSinCos(f_angle, &f_cosine);
-        float sine2 = (float) f_sine / 65536.0f;
-        float cosine2 = (float) f_cosine / 65536.0f;
-        float error = fabsf(sine - sine2);
-        if (error > 0.001)
-            SkDebugf("sin error : angle = %g ; sin = %g ; cordic = %g\n", angle, sine, sine2);
-        error = fabsf(cosine - cosine2);
-        if (error > 0.001)
-            SkDebugf("cos error : angle = %g ; cos = %g ; cordic = %g\n", angle, cosine, cosine2);
-    // tan
-        float _tan = tanf(radian);
-        SkFixed f_tan = SkCordicTan(f_angle);
-        float tan2 = (float) f_tan / 65536.0f;
-        error = fabsf(_tan - tan2);
-        if (error > 0.05 && fabsf(_tan) < 1e6)
-            SkDebugf("tan error : angle = %g ; tan = %g ; cordic = %g\n", angle, _tan, tan2);
-    }
-    for (val = -1; val <= 1; val += .1f) {
-        SkFixed f_val = SkFloatToFixed(val);
-    // asin
-        float arcsine = asinf(val);
-        SkFixed f_arcsine = SkCordicASin(f_val);
-        float arcsine2 = (float) f_arcsine / 65536.0f;
-        float error = fabsf(arcsine - arcsine2);
-        if (error > 0.001)
-            SkDebugf("asin error : val = %g ; asin = %g ; cordic = %g\n", val, arcsine, arcsine2);
-    }
-#if 1
-    for (val = -1; val <= 1; val += .1f) {
-#else
-    val = .5; {
-#endif
-        SkFixed f_val = SkFloatToFixed(val);
-    // acos
-        float arccos = acosf(val);
-        SkFixed f_arccos = SkCordicACos(f_val);
-        float arccos2 = (float) f_arccos / 65536.0f;
-        float error = fabsf(arccos - arccos2);
-        if (error > 0.001)
-            SkDebugf("acos error : val = %g ; acos = %g ; cordic = %g\n", val, arccos, arccos2);
-    }
-    // atan2
-#if 1
-    for (val = -1000; val <= 1000; val += 500.f) {
-        for (float val2 = -1000; val2 <= 1000; val2 += 500.f) {
-#else
-            val = 0; {
-            float val2 = -1000; {
-#endif
-            SkFixed f_val = SkFloatToFixed(val);
-            SkFixed f_val2 = SkFloatToFixed(val2);
-            float arctan = atan2f(val, val2);
-            SkFixed f_arctan = SkCordicATan2(f_val, f_val2);
-            float arctan2 = (float) f_arctan / 65536.0f;
-            float error = fabsf(arctan - arctan2);
-            if (error > 0.001)
-                SkDebugf("atan2 error : val = %g ; val2 = %g ; atan2 = %g ; cordic = %g\n", val, val2, arctan, arctan2);
-        }
-    }
-    // log
-#if 1
-    for (val = 0.125f; val <= 8.f; val *= 2.0f) {
-#else
-    val = .5; {
-#endif
-        SkFixed f_val = SkFloatToFixed(val);
-    // acos
-        float log = logf(val);
-        SkFixed f_log = SkCordicLog(f_val);
-        float log2 = (float) f_log / 65536.0f;
-        float error = fabsf(log - log2);
-        if (error > 0.001)
-            SkDebugf("log error : val = %g ; log = %g ; cordic = %g\n", val, log, log2);
-    }
-    // exp
-#endif
-}
-
-#endif