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 */
7
8 #include "include/core/SkColor.h"
9 #include "include/private/SkColorData.h"
10 #include "include/private/SkFixed.h"
11 #include "include/private/SkTPin.h"
12
SkPreMultiplyARGB(U8CPU a,U8CPU r,U8CPU g,U8CPU b)13 SkPMColor SkPreMultiplyARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b) {
14 return SkPremultiplyARGBInline(a, r, g, b);
15 }
16
SkPreMultiplyColor(SkColor c)17 SkPMColor SkPreMultiplyColor(SkColor c) {
18 return SkPremultiplyARGBInline(SkColorGetA(c), SkColorGetR(c),
19 SkColorGetG(c), SkColorGetB(c));
20 }
21
22 ///////////////////////////////////////////////////////////////////////////////
23
ByteToScalar(U8CPU x)24 static inline SkScalar ByteToScalar(U8CPU x) {
25 SkASSERT(x <= 255);
26 return SkIntToScalar(x) / 255;
27 }
28
ByteDivToScalar(int numer,U8CPU denom)29 static inline SkScalar ByteDivToScalar(int numer, U8CPU denom) {
30 // cast to keep the answer signed
31 return SkIntToScalar(numer) / (int)denom;
32 }
33
SkRGBToHSV(U8CPU r,U8CPU g,U8CPU b,SkScalar hsv[3])34 void SkRGBToHSV(U8CPU r, U8CPU g, U8CPU b, SkScalar hsv[3]) {
35 SkASSERT(hsv);
36
37 unsigned min = std::min(r, std::min(g, b));
38 unsigned max = std::max(r, std::max(g, b));
39 unsigned delta = max - min;
40
41 SkScalar v = ByteToScalar(max);
42 SkASSERT(v >= 0 && v <= SK_Scalar1);
43
44 if (0 == delta) { // we're a shade of gray
45 hsv[0] = 0;
46 hsv[1] = 0;
47 hsv[2] = v;
48 return;
49 }
50
51 SkScalar s = ByteDivToScalar(delta, max);
52 SkASSERT(s >= 0 && s <= SK_Scalar1);
53
54 SkScalar h;
55 if (r == max) {
56 h = ByteDivToScalar(g - b, delta);
57 } else if (g == max) {
58 h = SkIntToScalar(2) + ByteDivToScalar(b - r, delta);
59 } else { // b == max
60 h = SkIntToScalar(4) + ByteDivToScalar(r - g, delta);
61 }
62
63 h *= 60;
64 if (h < 0) {
65 h += SkIntToScalar(360);
66 }
67 SkASSERT(h >= 0 && h < SkIntToScalar(360));
68
69 hsv[0] = h;
70 hsv[1] = s;
71 hsv[2] = v;
72 }
73
SkHSVToColor(U8CPU a,const SkScalar hsv[3])74 SkColor SkHSVToColor(U8CPU a, const SkScalar hsv[3]) {
75 SkASSERT(hsv);
76
77 SkScalar s = SkTPin(hsv[1], 0.0f, 1.0f);
78 SkScalar v = SkTPin(hsv[2], 0.0f, 1.0f);
79
80 U8CPU v_byte = SkScalarRoundToInt(v * 255);
81
82 if (SkScalarNearlyZero(s)) { // shade of gray
83 return SkColorSetARGB(a, v_byte, v_byte, v_byte);
84 }
85 SkScalar hx = (hsv[0] < 0 || hsv[0] >= SkIntToScalar(360)) ? 0 : hsv[0]/60;
86 SkScalar w = SkScalarFloorToScalar(hx);
87 SkScalar f = hx - w;
88
89 unsigned p = SkScalarRoundToInt((SK_Scalar1 - s) * v * 255);
90 unsigned q = SkScalarRoundToInt((SK_Scalar1 - (s * f)) * v * 255);
91 unsigned t = SkScalarRoundToInt((SK_Scalar1 - (s * (SK_Scalar1 - f))) * v * 255);
92
93 unsigned r, g, b;
94
95 SkASSERT((unsigned)(w) < 6);
96 switch ((unsigned)(w)) {
97 case 0: r = v_byte; g = t; b = p; break;
98 case 1: r = q; g = v_byte; b = p; break;
99 case 2: r = p; g = v_byte; b = t; break;
100 case 3: r = p; g = q; b = v_byte; break;
101 case 4: r = t; g = p; b = v_byte; break;
102 default: r = v_byte; g = p; b = q; break;
103 }
104 return SkColorSetARGB(a, r, g, b);
105 }
106
107 ///////////////////////////////////////////////////////////////////////////////////////////////////
108
109 template <>
FromColor(SkColor bgra)110 SkColor4f SkColor4f::FromColor(SkColor bgra) {
111 SkColor4f rgba;
112 swizzle_rb(Sk4f_fromL32(bgra)).store(rgba.vec());
113 return rgba;
114 }
115
116 template <>
toSkColor() const117 SkColor SkColor4f::toSkColor() const {
118 return Sk4f_toL32(swizzle_rb(Sk4f::Load(this->vec())));
119 }
120
121 template <>
toBytes_RGBA() const122 uint32_t SkColor4f::toBytes_RGBA() const {
123 return Sk4f_toL32(Sk4f::Load(this->vec()));
124 }
125
126 template <>
FromBytes_RGBA(uint32_t c)127 SkColor4f SkColor4f::FromBytes_RGBA(uint32_t c) {
128 SkColor4f color;
129 Sk4f_fromL32(c).store(&color);
130 return color;
131 }
132
133 template <>
FromPMColor(SkPMColor c)134 SkPMColor4f SkPMColor4f::FromPMColor(SkPMColor c) {
135 SkPMColor4f color;
136 swizzle_rb_if_bgra(Sk4f_fromL32(c)).store(&color);
137 return color;
138 }
139
140 template <>
toBytes_RGBA() const141 uint32_t SkPMColor4f::toBytes_RGBA() const {
142 return Sk4f_toL32(Sk4f::Load(this->vec()));
143 }
144
145 template <>
FromBytes_RGBA(uint32_t c)146 SkPMColor4f SkPMColor4f::FromBytes_RGBA(uint32_t c) {
147 SkPMColor4f color;
148 Sk4f_fromL32(c).store(&color);
149 return color;
150 }
151