1 // Copyright 2017 PDFium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6
7 #include "core/fxge/cfx_color.h"
8
9 #include <algorithm>
10
11 // Color types are orded by increasing number of components so we can
12 // choose a best color type during some conversions.
13 static_assert(CFX_Color::kTransparent < CFX_Color::kGray,
14 "color type values must be ordered");
15 static_assert(CFX_Color::kGray < CFX_Color::kRGB,
16 "color type values must be ordered");
17 static_assert(CFX_Color::kRGB < CFX_Color::kCMYK,
18 "color type values must be ordered");
19
20 namespace {
21
InRange(float comp)22 bool InRange(float comp) {
23 return comp >= 0.0f && comp <= 1.0f;
24 }
25
ConvertCMYK2GRAY(float dC,float dM,float dY,float dK)26 CFX_Color ConvertCMYK2GRAY(float dC, float dM, float dY, float dK) {
27 if (!InRange(dC) || !InRange(dM) || !InRange(dY) || !InRange(dK))
28 return CFX_Color(CFX_Color::kGray);
29 return CFX_Color(
30 CFX_Color::kGray,
31 1.0f - std::min(1.0f, 0.3f * dC + 0.59f * dM + 0.11f * dY + dK));
32 }
33
ConvertGRAY2CMYK(float dGray)34 CFX_Color ConvertGRAY2CMYK(float dGray) {
35 if (!InRange(dGray))
36 return CFX_Color(CFX_Color::kCMYK);
37 return CFX_Color(CFX_Color::kCMYK, 0.0f, 0.0f, 0.0f, 1.0f - dGray);
38 }
39
ConvertGRAY2RGB(float dGray)40 CFX_Color ConvertGRAY2RGB(float dGray) {
41 if (!InRange(dGray))
42 return CFX_Color(CFX_Color::kRGB);
43 return CFX_Color(CFX_Color::kRGB, dGray, dGray, dGray);
44 }
45
ConvertRGB2GRAY(float dR,float dG,float dB)46 CFX_Color ConvertRGB2GRAY(float dR, float dG, float dB) {
47 if (!InRange(dR) || !InRange(dG) || !InRange(dB))
48 return CFX_Color(CFX_Color::kGray);
49 return CFX_Color(CFX_Color::kGray, 0.3f * dR + 0.59f * dG + 0.11f * dB);
50 }
51
ConvertCMYK2RGB(float dC,float dM,float dY,float dK)52 CFX_Color ConvertCMYK2RGB(float dC, float dM, float dY, float dK) {
53 if (!InRange(dC) || !InRange(dM) || !InRange(dY) || !InRange(dK))
54 return CFX_Color(CFX_Color::kRGB);
55 return CFX_Color(CFX_Color::kRGB, 1.0f - std::min(1.0f, dC + dK),
56 1.0f - std::min(1.0f, dM + dK),
57 1.0f - std::min(1.0f, dY + dK));
58 }
59
ConvertRGB2CMYK(float dR,float dG,float dB)60 CFX_Color ConvertRGB2CMYK(float dR, float dG, float dB) {
61 if (!InRange(dR) || !InRange(dG) || !InRange(dB))
62 return CFX_Color(CFX_Color::kCMYK);
63
64 float c = 1.0f - dR;
65 float m = 1.0f - dG;
66 float y = 1.0f - dB;
67 return CFX_Color(CFX_Color::kCMYK, c, m, y, std::min(c, std::min(m, y)));
68 }
69
70 } // namespace
71
ConvertColorType(int32_t nConvertColorType) const72 CFX_Color CFX_Color::ConvertColorType(int32_t nConvertColorType) const {
73 if (nColorType == nConvertColorType)
74 return *this;
75
76 CFX_Color ret;
77 switch (nColorType) {
78 case CFX_Color::kTransparent:
79 ret = *this;
80 ret.nColorType = CFX_Color::kTransparent;
81 break;
82 case CFX_Color::kGray:
83 switch (nConvertColorType) {
84 case CFX_Color::kRGB:
85 ret = ConvertGRAY2RGB(fColor1);
86 break;
87 case CFX_Color::kCMYK:
88 ret = ConvertGRAY2CMYK(fColor1);
89 break;
90 }
91 break;
92 case CFX_Color::kRGB:
93 switch (nConvertColorType) {
94 case CFX_Color::kGray:
95 ret = ConvertRGB2GRAY(fColor1, fColor2, fColor3);
96 break;
97 case CFX_Color::kCMYK:
98 ret = ConvertRGB2CMYK(fColor1, fColor2, fColor3);
99 break;
100 }
101 break;
102 case CFX_Color::kCMYK:
103 switch (nConvertColorType) {
104 case CFX_Color::kGray:
105 ret = ConvertCMYK2GRAY(fColor1, fColor2, fColor3, fColor4);
106 break;
107 case CFX_Color::kRGB:
108 ret = ConvertCMYK2RGB(fColor1, fColor2, fColor3, fColor4);
109 break;
110 }
111 break;
112 }
113 return ret;
114 }
115
ToFXColor(int32_t nTransparency) const116 FX_COLORREF CFX_Color::ToFXColor(int32_t nTransparency) const {
117 CFX_Color ret;
118 switch (nColorType) {
119 case CFX_Color::kTransparent: {
120 ret = CFX_Color(CFX_Color::kTransparent, 0, 0, 0, 0);
121 break;
122 }
123 case CFX_Color::kGray: {
124 ret = ConvertGRAY2RGB(fColor1);
125 ret.fColor4 = nTransparency;
126 break;
127 }
128 case CFX_Color::kRGB: {
129 ret = CFX_Color(CFX_Color::kRGB, fColor1, fColor2, fColor3);
130 ret.fColor4 = nTransparency;
131 break;
132 }
133 case CFX_Color::kCMYK: {
134 ret = ConvertCMYK2RGB(fColor1, fColor2, fColor3, fColor4);
135 ret.fColor4 = nTransparency;
136 break;
137 }
138 }
139 return ArgbEncode(ret.fColor4, static_cast<int32_t>(ret.fColor1 * 255),
140 static_cast<int32_t>(ret.fColor2 * 255),
141 static_cast<int32_t>(ret.fColor3 * 255));
142 }
143
operator -(float fColorSub) const144 CFX_Color CFX_Color::operator-(float fColorSub) const {
145 CFX_Color sRet(nColorType);
146 switch (nColorType) {
147 case CFX_Color::kTransparent:
148 sRet.nColorType = CFX_Color::kRGB;
149 sRet.fColor1 = std::max(1.0f - fColorSub, 0.0f);
150 sRet.fColor2 = std::max(1.0f - fColorSub, 0.0f);
151 sRet.fColor3 = std::max(1.0f - fColorSub, 0.0f);
152 break;
153 case CFX_Color::kRGB:
154 case CFX_Color::kGray:
155 case CFX_Color::kCMYK:
156 sRet.fColor1 = std::max(fColor1 - fColorSub, 0.0f);
157 sRet.fColor2 = std::max(fColor2 - fColorSub, 0.0f);
158 sRet.fColor3 = std::max(fColor3 - fColorSub, 0.0f);
159 sRet.fColor4 = std::max(fColor4 - fColorSub, 0.0f);
160 break;
161 }
162 return sRet;
163 }
164
operator /(float fColorDivide) const165 CFX_Color CFX_Color::operator/(float fColorDivide) const {
166 CFX_Color sRet(nColorType);
167 switch (nColorType) {
168 case CFX_Color::kTransparent:
169 sRet.nColorType = CFX_Color::kRGB;
170 sRet.fColor1 = 1.0f / fColorDivide;
171 sRet.fColor2 = 1.0f / fColorDivide;
172 sRet.fColor3 = 1.0f / fColorDivide;
173 break;
174 case CFX_Color::kRGB:
175 case CFX_Color::kGray:
176 case CFX_Color::kCMYK:
177 sRet = *this;
178 sRet.fColor1 /= fColorDivide;
179 sRet.fColor2 /= fColorDivide;
180 sRet.fColor3 /= fColorDivide;
181 sRet.fColor4 /= fColorDivide;
182 break;
183 }
184 return sRet;
185 }
186