gfx/skia/trunk/include/core/SkFixed.h@129ffea94266
gfx/skia/trunk/include/core/SkFixed.h
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
1 /*
2 * Copyright 2006 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
8 #ifndef SkFixed_DEFINED
9 #define SkFixed_DEFINED
11 #include "SkTypes.h"
13 /** \file SkFixed.h
15 Types and macros for 16.16 fixed point
16 */
18 /** 32 bit signed integer used to represent fractions values with 16 bits to the right of the decimal point
19 */
20 typedef int32_t SkFixed;
21 #define SK_Fixed1 (1 << 16)
22 #define SK_FixedHalf (1 << 15)
23 #define SK_FixedMax (0x7FFFFFFF)
24 #define SK_FixedMin (-SK_FixedMax)
25 #define SK_FixedNaN ((int) 0x80000000)
26 #define SK_FixedPI (0x3243F)
27 #define SK_FixedSqrt2 (92682)
28 #define SK_FixedTanPIOver8 (0x6A0A)
29 #define SK_FixedRoot2Over2 (0xB505)
31 #define SkFixedToFloat(x) ((x) * 1.5258789e-5f)
32 #if 1
33 #define SkFloatToFixed(x) ((SkFixed)((x) * SK_Fixed1))
34 #else
35 // pins over/under flows to max/min int32 (slower than just a cast)
36 static inline SkFixed SkFloatToFixed(float x) {
37 int64_t n = x * SK_Fixed1;
38 return (SkFixed)n;
39 }
40 #endif
42 #ifdef SK_DEBUG
43 static inline SkFixed SkFloatToFixed_Check(float x) {
44 int64_t n64 = (int64_t)(x * SK_Fixed1);
45 SkFixed n32 = (SkFixed)n64;
46 SkASSERT(n64 == n32);
47 return n32;
48 }
49 #else
50 #define SkFloatToFixed_Check(x) SkFloatToFixed(x)
51 #endif
53 #define SkFixedToDouble(x) ((x) * 1.5258789e-5)
54 #define SkDoubleToFixed(x) ((SkFixed)((x) * SK_Fixed1))
56 /** Converts an integer to a SkFixed, asserting that the result does not overflow
57 a 32 bit signed integer
58 */
59 #ifdef SK_DEBUG
60 inline SkFixed SkIntToFixed(int n)
61 {
62 SkASSERT(n >= -32768 && n <= 32767);
63 return n << 16;
64 }
65 #else
66 // force the cast to SkFixed to ensure that the answer is signed (like the debug version)
67 #define SkIntToFixed(n) (SkFixed)((n) << 16)
68 #endif
70 #define SkFixedRoundToInt(x) (((x) + SK_FixedHalf) >> 16)
71 #define SkFixedCeilToInt(x) (((x) + SK_Fixed1 - 1) >> 16)
72 #define SkFixedFloorToInt(x) ((x) >> 16)
74 #define SkFixedRoundToFixed(x) (((x) + SK_FixedHalf) & 0xFFFF0000)
75 #define SkFixedCeilToFixed(x) (((x) + SK_Fixed1 - 1) & 0xFFFF0000)
76 #define SkFixedFloorToFixed(x) ((x) & 0xFFFF0000)
78 #define SkFixedAbs(x) SkAbs32(x)
79 #define SkFixedAve(a, b) (((a) + (b)) >> 1)
81 SkFixed SkFixedMul_portable(SkFixed, SkFixed);
83 #define SkFixedDiv(numer, denom) SkDivBits(numer, denom, 16)
85 ///////////////////////////////////////////////////////////////////////////////
86 // TODO: move fixed sin/cos into SkCosineMapper, as that is the only caller
87 // or rewrite SkCosineMapper to not use it at all
89 SkFixed SkFixedSinCos(SkFixed radians, SkFixed* cosValueOrNull);
90 #define SkFixedSin(radians) SkFixedSinCos(radians, NULL)
91 static inline SkFixed SkFixedCos(SkFixed radians) {
92 SkFixed cosValue;
93 (void)SkFixedSinCos(radians, &cosValue);
94 return cosValue;
95 }
97 //////////////////////////////////////////////////////////////////////////////////////////////////////
98 // Now look for ASM overrides for our portable versions (should consider putting this in its own file)
100 #ifdef SkLONGLONG
101 inline SkFixed SkFixedMul_longlong(SkFixed a, SkFixed b)
102 {
103 return (SkFixed)((int64_t)a * b >> 16);
104 }
105 #define SkFixedMul(a,b) SkFixedMul_longlong(a,b)
106 #endif
108 #if defined(SK_CPU_ARM)
109 /* This guy does not handle NaN or other obscurities, but is faster than
110 than (int)(x*65536)
111 */
112 inline SkFixed SkFloatToFixed_arm(float x)
113 {
114 int32_t y, z;
115 asm("movs %1, %3, lsl #1 \n"
116 "mov %2, #0x8E \n"
117 "sub %1, %2, %1, lsr #24 \n"
118 "mov %2, %3, lsl #8 \n"
119 "orr %2, %2, #0x80000000 \n"
120 "mov %1, %2, lsr %1 \n"
121 "it cs \n"
122 "rsbcs %1, %1, #0 \n"
123 : "=r"(x), "=&r"(y), "=&r"(z)
124 : "r"(x)
125 : "cc"
126 );
127 return y;
128 }
129 inline SkFixed SkFixedMul_arm(SkFixed x, SkFixed y)
130 {
131 int32_t t;
132 asm("smull %0, %2, %1, %3 \n"
133 "mov %0, %0, lsr #16 \n"
134 "orr %0, %0, %2, lsl #16 \n"
135 : "=r"(x), "=&r"(y), "=r"(t)
136 : "r"(x), "1"(y)
137 :
138 );
139 return x;
140 }
141 #undef SkFixedMul
142 #define SkFixedMul(x, y) SkFixedMul_arm(x, y)
144 #undef SkFloatToFixed
145 #define SkFloatToFixed(x) SkFloatToFixed_arm(x)
146 #endif
148 #ifndef SkFixedMul
149 #define SkFixedMul(x, y) SkFixedMul_portable(x, y)
150 #endif
152 ///////////////////////////////////////////////////////////////////////////////
154 typedef int64_t SkFixed48;
156 #define SkIntToFixed48(x) ((SkFixed48)(x) << 48)
157 #define SkFixed48ToInt(x) ((int)((x) >> 48))
158 #define SkFixedToFixed48(x) ((SkFixed48)(x) << 32)
159 #define SkFixed48ToFixed(x) ((SkFixed)((x) >> 32))
160 #define SkFloatToFixed48(x) ((SkFixed48)((x) * (65536.0f * 65536.0f * 65536.0f)))
162 #define SkScalarToFixed48(x) SkFloatToFixed48(x)
164 #endif
