1 /*
2 * Copyright 2015 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SkUtils.h"
9
10 namespace { // NOLINT(google-build-namespaces)
11
widen()12 inline Sk4px::Wide Sk4px::widen() const {
13 return Sk16h((*this)[ 0], (*this)[ 1], (*this)[ 2], (*this)[ 3],
14 (*this)[ 4], (*this)[ 5], (*this)[ 6], (*this)[ 7],
15 (*this)[ 8], (*this)[ 9], (*this)[10], (*this)[11],
16 (*this)[12], (*this)[13], (*this)[14], (*this)[15]);
17 }
18
mulWiden(const Sk16b & other)19 inline Sk4px::Wide Sk4px::mulWiden(const Sk16b& other) const {
20 return this->widen() * Sk4px(other).widen();
21 }
22
addNarrowHi(const Sk16h & other)23 inline Sk4px Sk4px::Wide::addNarrowHi(const Sk16h& other) const {
24 Sk4px::Wide r = (*this + other) >> 8;
25 return Sk16b(r[ 0], r[ 1], r[ 2], r[ 3],
26 r[ 4], r[ 5], r[ 6], r[ 7],
27 r[ 8], r[ 9], r[10], r[11],
28 r[12], r[13], r[14], r[15]);
29 }
30
div255()31 inline Sk4px Sk4px::Wide::div255() const {
32 // Calculated as ((x+128) + ((x+128)>>8)) >> 8.
33 auto v = *this + Sk16h(128);
34 return v.addNarrowHi(v>>8);
35 }
36
alphas()37 inline Sk4px Sk4px::alphas() const {
38 static_assert(SK_A32_SHIFT == 24, "This method assumes little-endian.");
39 return Sk16b((*this)[ 3], (*this)[ 3], (*this)[ 3], (*this)[ 3],
40 (*this)[ 7], (*this)[ 7], (*this)[ 7], (*this)[ 7],
41 (*this)[11], (*this)[11], (*this)[11], (*this)[11],
42 (*this)[15], (*this)[15], (*this)[15], (*this)[15]);
43 }
44
Load4Alphas(const SkAlpha a[4])45 inline Sk4px Sk4px::Load4Alphas(const SkAlpha a[4]) {
46 return Sk16b(a[0], a[0], a[0], a[0],
47 a[1], a[1], a[1], a[1],
48 a[2], a[2], a[2], a[2],
49 a[3], a[3], a[3], a[3]);
50 }
51
Load2Alphas(const SkAlpha a[2])52 inline Sk4px Sk4px::Load2Alphas(const SkAlpha a[2]) {
53 return Sk16b(a[0], a[0], a[0], a[0],
54 a[1], a[1], a[1], a[1],
55 0,0,0,0,
56 0,0,0,0);
57 }
58
59 } // namespace
60