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/base/SkTPin.h"
10 #include "include/private/chromium/SkPMColor.h"
11 #include "src/base/SkVx.h"
12 #include "src/core/SkColorData.h"
13 #include "src/core/SkColorPriv.h"
14 #include "src/core/SkSwizzlePriv.h"
15
16 #include <algorithm>
17
SkPreMultiplyARGB(U8CPU a,U8CPU r,U8CPU g,U8CPU b)18 SkPMColor SkPreMultiplyARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b) {
19 return SkPremultiplyARGBInline(a, r, g, b);
20 }
21
SkPreMultiplyColor(SkColor c)22 SkPMColor SkPreMultiplyColor(SkColor c) {
23 return SkPremultiplyARGBInline(SkColorGetA(c), SkColorGetR(c),
24 SkColorGetG(c), SkColorGetB(c));
25 }
26
SkPMColorSetARGB(uint8_t a,uint8_t r,uint8_t g,uint8_t b)27 SkPMColor SkPMColorSetARGB(uint8_t a, uint8_t r, uint8_t g, uint8_t b) {
28 return SkPackARGB32(a, r, g, b);
29 }
30
SkPMColorGetA(SkPMColor c)31 SkAlpha SkPMColorGetA(SkPMColor c) {
32 return SkGetPackedA32(c);
33 }
34
SkPMColorGetR(SkPMColor c)35 uint8_t SkPMColorGetR(SkPMColor c) {
36 return SkGetPackedR32(c);
37 }
38
SkPMColorGetG(SkPMColor c)39 uint8_t SkPMColorGetG(SkPMColor c) {
40 return SkGetPackedG32(c);
41 }
42
SkPMColorGetB(SkPMColor c)43 uint8_t SkPMColorGetB(SkPMColor c) {
44 return SkGetPackedB32(c);
45 }
46
47 ///////////////////////////////////////////////////////////////////////////////
48
ByteToScalar(U8CPU x)49 static inline SkScalar ByteToScalar(U8CPU x) {
50 SkASSERT(x <= 255);
51 return SkIntToScalar(x) / 255;
52 }
53
ByteDivToScalar(int numer,U8CPU denom)54 static inline SkScalar ByteDivToScalar(int numer, U8CPU denom) {
55 // cast to keep the answer signed
56 return SkIntToScalar(numer) / (int)denom;
57 }
58
SkRGBToHSV(U8CPU r,U8CPU g,U8CPU b,SkScalar hsv[3])59 void SkRGBToHSV(U8CPU r, U8CPU g, U8CPU b, SkScalar hsv[3]) {
60 SkASSERT(hsv);
61
62 unsigned min = std::min(r, std::min(g, b));
63 unsigned max = std::max(r, std::max(g, b));
64 unsigned delta = max - min;
65
66 SkScalar v = ByteToScalar(max);
67 SkASSERT(v >= 0 && v <= SK_Scalar1);
68
69 if (0 == delta) { // we're a shade of gray
70 hsv[0] = 0;
71 hsv[1] = 0;
72 hsv[2] = v;
73 return;
74 }
75
76 SkScalar s = ByteDivToScalar(delta, max);
77 SkASSERT(s >= 0 && s <= SK_Scalar1);
78
79 SkScalar h;
80 if (r == max) {
81 h = ByteDivToScalar(g - b, delta);
82 } else if (g == max) {
83 h = SkIntToScalar(2) + ByteDivToScalar(b - r, delta);
84 } else { // b == max
85 h = SkIntToScalar(4) + ByteDivToScalar(r - g, delta);
86 }
87
88 h *= 60;
89 if (h < 0) {
90 h += SkIntToScalar(360);
91 }
92 SkASSERT(h >= 0 && h < SkIntToScalar(360));
93
94 hsv[0] = h;
95 hsv[1] = s;
96 hsv[2] = v;
97 }
98
SkHSVToColor(U8CPU a,const SkScalar hsv[3])99 SkColor SkHSVToColor(U8CPU a, const SkScalar hsv[3]) {
100 SkASSERT(hsv);
101
102 SkScalar s = SkTPin(hsv[1], 0.0f, 1.0f);
103 SkScalar v = SkTPin(hsv[2], 0.0f, 1.0f);
104
105 U8CPU v_byte = SkScalarRoundToInt(v * 255);
106
107 if (SkScalarNearlyZero(s)) { // shade of gray
108 return SkColorSetARGB(a, v_byte, v_byte, v_byte);
109 }
110 SkScalar hx = (hsv[0] < 0 || hsv[0] >= SkIntToScalar(360)) ? 0 : hsv[0]/60;
111 SkScalar w = SkScalarFloorToScalar(hx);
112 SkScalar f = hx - w;
113
114 unsigned p = SkScalarRoundToInt((SK_Scalar1 - s) * v * 255);
115 unsigned q = SkScalarRoundToInt((SK_Scalar1 - (s * f)) * v * 255);
116 unsigned t = SkScalarRoundToInt((SK_Scalar1 - (s * (SK_Scalar1 - f))) * v * 255);
117
118 unsigned r, g, b;
119
120 SkASSERT((unsigned)(w) < 6);
121 switch ((unsigned)(w)) {
122 case 0: r = v_byte; g = t; b = p; break;
123 case 1: r = q; g = v_byte; b = p; break;
124 case 2: r = p; g = v_byte; b = t; break;
125 case 3: r = p; g = q; b = v_byte; break;
126 case 4: r = t; g = p; b = v_byte; break;
127 default: r = v_byte; g = p; b = q; break;
128 }
129 return SkColorSetARGB(a, r, g, b);
130 }
131
132 ///////////////////////////////////////////////////////////////////////////////////////////////////
133
134 template <>
FromColor(SkColor bgra)135 SkColor4f SkColor4f::FromColor(SkColor bgra) {
136 SkColor4f rgba;
137 swizzle_rb(Sk4f_fromL32(bgra)).store(rgba.vec());
138 return rgba;
139 }
140
141 template <>
toSkColor() const142 SkColor SkColor4f::toSkColor() const {
143 return Sk4f_toL32(swizzle_rb(skvx::float4::Load(this->vec())));
144 }
145
146 template <>
toBytes_RGBA() const147 uint32_t SkColor4f::toBytes_RGBA() const {
148 return Sk4f_toL32(skvx::float4::Load(this->vec()));
149 }
150
151 template <>
FromBytes_RGBA(uint32_t c)152 SkColor4f SkColor4f::FromBytes_RGBA(uint32_t c) {
153 SkColor4f color;
154 Sk4f_fromL32(c).store(&color);
155 return color;
156 }
157
158 template <>
FromPMColor(SkPMColor c)159 SkPMColor4f SkPMColor4f::FromPMColor(SkPMColor c) {
160 SkPMColor4f color;
161 swizzle_rb_if_bgra(Sk4f_fromL32(c)).store(&color);
162 return color;
163 }
164
165 template <>
toBytes_RGBA() const166 uint32_t SkPMColor4f::toBytes_RGBA() const {
167 return Sk4f_toL32(skvx::float4::Load(this->vec()));
168 }
169
170 template <>
FromBytes_RGBA(uint32_t c)171 SkPMColor4f SkPMColor4f::FromBytes_RGBA(uint32_t c) {
172 SkPMColor4f color;
173 Sk4f_fromL32(c).store(&color);
174 return color;
175 }
176