OpenClonk
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Properties Friends Macros
StdColors.h
Go to the documentation of this file.
1 /*
2  * OpenClonk, http://www.openclonk.org
3  *
4  * Copyright (c) 2001-2009, RedWolf Design GmbH, http://www.clonk.de/
5  * Copyright (c) 2009-2016, The OpenClonk Team and contributors
6  *
7  * Distributed under the terms of the ISC license; see accompanying file
8  * "COPYING" for details.
9  *
10  * "Clonk" is a registered trademark of Matthes Bender, used with permission.
11  * See accompanying file "TRADEMARK" for details.
12  *
13  * To redistribute this file separately, substitute the full license texts
14  * for the above references.
15  */
16 // color calculation routines
17 
18 #ifndef INC_StdColors
19 #define INC_StdColors
20 
21 // helper function
22 inline uint32_t RGBA(uint32_t r, uint32_t g, uint32_t b, uint32_t a)
23 {
24  return ((a & 255) << 24) | ((r & 255) << 16) | ((g & 255) << 8) | (b & 255);
25 }
26 #define C4RGB(r, g, b) (((DWORD)(0xff)<<24)|(((DWORD)(r)&0xff)<<16)|(((DWORD)(g)&0xff)<<8)|((b)&0xff))
27 #define GetBlueValue(rgb) ((unsigned char)(rgb))
28 #define GetGreenValue(rgb) ((unsigned char)(((unsigned short)(rgb)) >> 8))
29 #define GetRedValue(rgb) ((unsigned char)((rgb)>>16))
30 
31 inline void BltAlpha(DWORD &dwDst, DWORD dwSrc)
32 {
33  // blit one color value w/alpha on another
34  if (dwDst>>24 == 0x00) { dwDst=dwSrc; return; }
35  BYTE byAlphaSrc=BYTE(dwSrc>>24); BYTE byAlphaDst=255-byAlphaSrc;
36  dwDst = std::min<uint32_t>(((dwDst & 0xff ) * byAlphaDst + (dwSrc & 0xff ) * byAlphaSrc) >>8, 0xff) | // blue
37  std::min<uint32_t>(((dwDst & 0xff00) * byAlphaDst + (dwSrc & 0xff00 ) * byAlphaSrc) >>8 & 0xff00, 0xff00) | // green
38  std::min<uint32_t>(((dwDst & 0xff0000) * byAlphaDst + (dwSrc & 0xff0000) * byAlphaSrc) >>8 & 0xff0000, 0xff0000) | // red
39  std::min<uint32_t>( (dwDst >> 24) + byAlphaSrc, 255) << 24; // alpha
40 }
41 
42 inline void BltAlphaAdd(DWORD &dwDst, DWORD dwSrc)
43 {
44  // blit one color value w/alpha on another in additive mode
45  if (dwDst>>24 == 0x00) { dwDst=dwSrc; return; }
46  BYTE byAlphaSrc=BYTE(dwSrc>>24);
47  dwDst = std::min<uint32_t>((dwDst & 0xff ) + ((int(dwSrc & 0xff ) * byAlphaSrc) >>8) , 0xff) | // blue
48  std::min<uint32_t>(((dwDst & 0xff00) + (int(dwSrc>>8 & 0xff ) * byAlphaSrc)) & 0x00ffff00, 0xff00) | // green
49  std::min<uint32_t>(((dwDst & 0xff0000) + (int(dwSrc>>8 & 0xff00) * byAlphaSrc)) & 0xffff0000, 0xff0000) | // red
50  std::min<uint32_t>( (dwDst >> 24) + byAlphaSrc, 255) << 24; // alpha
51 }
52 
53 inline void ModulateClr(DWORD &dwDst, DWORD dwMod) // modulate two color values
54 {
55  // modulate two color values
56  // get alpha
57  int iA1=dwDst>>24, iA2=dwMod>>24;
58  // modulate color values; mod alpha upwards
59  dwDst = ((dwDst & 0xff) * (dwMod & 0xff) / 0xff) | // blue
60  ((dwDst>> 8 & 0xff) * (dwMod>> 8 & 0xff) / 0xff) << 8 | // green
61  ((dwDst>>16 & 0xff) * (dwMod>>16 & 0xff) / 0xff) << 16| // red
62  std::min(iA1*iA2/0xff, 255) << 24; // alpha (TODO: We don't need std::min() here, do we?)
63 }
64 
65 inline void ModulateClrA(DWORD &dwDst, DWORD dwMod) // modulate two color values and add alpha value
66 {
67  // modulate two color values and add alpha value
68  dwDst = ((dwDst & 0xff) * (dwMod & 0xff) / 0xff) | // B
69  ((dwDst>> 8 & 0xff) * (dwMod>> 8 & 0xff) / 0xff) << 8 | // G
70  ((dwDst>>16 & 0xff) * (dwMod>>16 & 0xff) / 0xff) << 16| // R
71  (std::max<uint32_t>((dwDst>>24)+(dwMod>>24), 0xff) - 0xff)<<24;
72 }
73 inline void ModulateClrMOD2(DWORD &dwDst, DWORD dwMod) // clr1+clr2-0.5
74 {
75  // signed color addition
76  dwDst = (Clamp<int>(((int)(dwDst&0xff)+(dwMod&0xff)-0x7f)<<1,0,0xff)&0xff) | // B
77  (Clamp<int>(((int)(dwDst&0xff00)+(dwMod&0xff00)-0x7f00)<<1,0,0xff00)&0xff00) | // G
78  (Clamp<int>(((int)(dwDst&0xff0000)+(dwMod&0xff0000)-0x7f0000)<<1,0,0xff0000)&0xff0000) | // R
79  (std::max<uint32_t>((dwDst>>24)+(dwMod>>24), 0xff) - 0xff)<<24;
80 }
81 
82 inline DWORD LightenClrBy(DWORD &dwDst, int iBy) // enlight a color
83 {
84  // enlight a color
85  // quite a desaturating method...
86  dwDst = std::min<int>((dwDst & 0xff) + iBy, 255) | // blue
87  std::min<int>((dwDst>> 8 & 0xff) + iBy, 255) << 8 | // green
88  std::min<int>((dwDst>>16 & 0xff) + iBy, 255) << 16 | // red
89  (dwDst & 0xff000000); // alpha
90  return dwDst;
91 }
92 
93 inline DWORD DarkenClrBy(DWORD &dwDst, int iBy) // darken a color
94 {
95  // darken a color
96  // quite a desaturating method...
97  dwDst = std::max<int>(int(dwDst & 0xff) - iBy, 0) | // blue
98  std::max<int>(int(dwDst>> 8 & 0xff) - iBy, 0) << 8 | // green
99  std::max<int>(int(dwDst>>16 & 0xff) - iBy, 0) << 16 | // red
100  (dwDst & 0xff000000); // alpha
101  return dwDst;
102 }
103 
104 inline DWORD PlrClr2TxtClr(DWORD dwClr)
105 {
106  // convert player color to text color, lightening up when necessary
107  int lgt=std::max(std::max(GetRedValue(dwClr), GetGreenValue(dwClr)), GetBlueValue(dwClr));
108  if (lgt<0x8f) LightenClrBy(dwClr, 0x8f-lgt);
109  return dwClr|0xff000000;
110 }
111 
112 inline DWORD GetClrModulation(DWORD dwSrcClr, DWORD dwDstClr, DWORD &dwBack)
113 {
114  // get modulation that is necessary to transform dwSrcClr to dwDstClr
115  // does not support alpha values in dwSrcClr and dwDstClr
116  // get source color
117  BYTE sB=BYTE(dwSrcClr); dwSrcClr=dwSrcClr>>8;
118  BYTE sG=BYTE(dwSrcClr); dwSrcClr=dwSrcClr>>8;
119  BYTE sR=BYTE(dwSrcClr); dwSrcClr=dwSrcClr>>8;
120  // get dest color
121  BYTE dB=BYTE(dwDstClr); dwDstClr=dwDstClr>>8;
122  BYTE dG=BYTE(dwDstClr); dwDstClr=dwDstClr>>8;
123  BYTE dR=BYTE(dwDstClr); dwDstClr=dwDstClr>>8;
124  // get difference
125  int cR=(int) dR-sR;
126  int cG=(int) dG-sG;
127  int cB=(int) dB-sB;
128  // get max enlightment
129  int diffN=0;
130  if (cR>0) diffN=cR;
131  if (cG>0) diffN=std::max(diffN, cG);
132  if (cB>0) diffN=std::max(diffN, cB);
133  // is dest > src?
134  if (diffN)
135  {
136  // so a back mask must be used
137  int bR=sR+(cR*255)/diffN;
138  int bG=sG+(cG*255)/diffN;
139  int bB=sB+(cB*255)/diffN;
140  dwBack=RGBA(bR, bG, bB, 255);
141  }
142  if (!sR) sR=1; if (!sG) sG=1; if (!sB) sB=1;
143  return RGBA(std::min((int)dR*256/sR, 255), std::min((int)dG*256/sG, 255), std::min((int)dB*256/sB, 255), 255-diffN);
144 }
145 
146 inline bool rgb2xyY(double r, double g, double b, double *px, double *py, double *pY) // linear rgb to CIE xyY
147 {
148  double X = 0.412453*r + 0.357580*g + 0.180423*b;
149  double Y = 0.212671*r + 0.715160*g + 0.072169*b;
150  double Z = 0.019334*r + 0.119193*g + 0.950227*b;
151  double XYZ=X+Y+Z;
152  if (!XYZ)
153  {
154  *px=*py=0.3; // assume grey cromaticity for black
155  }
156  else
157  {
158  *px = X/XYZ; *py = Y/XYZ;
159  }
160  *pY = Y;
161  return true;
162 }
163 
164 inline bool xy2upvp(double x, double y, double *pu, double *pv) // CIE xy to u'v'
165 {
166  double n = -2.0*x+12.0*y+3.0;
167  if (!n) return false;
168  *pu = 4.0*x / n;
169  *pv = 9.0*y / n;
170  return true;
171 }
172 
173 inline bool RGB2rgb(int R, int G, int B, double *pr, double *pg, double *pb, double gamma=2.2) // monitor RGB (0 to 255) to linear rgb (0.0 to 1.0) assuming default gamma 2.2
174 {
175  *pr = pow((double) R / 255.0, 1.0/gamma);
176  *pg = pow((double) G / 255.0, 1.0/gamma);
177  *pb = pow((double) B / 255.0, 1.0/gamma);
178  return true;
179 }
180 
181 // a standard pal
183 {
184  DWORD Colors[256];
185 
187  { return Colors[byCol]; }
188 };
189 
190 #endif
DWORD GetClrModulation(DWORD dwSrcClr, DWORD dwDstClr, DWORD &dwBack)
Definition: StdColors.h:112
#define GetGreenValue(rgb)
Definition: StdColors.h:28
#define b
DWORD Colors[256]
Definition: StdColors.h:184
DWORD DarkenClrBy(DWORD &dwDst, int iBy)
Definition: StdColors.h:93
uint8_t BYTE
void ModulateClr(DWORD &dwDst, DWORD dwMod)
Definition: StdColors.h:53
#define a
#define GetRedValue(rgb)
Definition: StdColors.h:29
void ModulateClrMOD2(DWORD &dwDst, DWORD dwMod)
Definition: StdColors.h:73
DWORD GetClr(BYTE byCol)
Definition: StdColors.h:186
#define GetBlueValue(rgb)
Definition: StdColors.h:27
bool xy2upvp(double x, double y, double *pu, double *pv)
Definition: StdColors.h:164
DWORD LightenClrBy(DWORD &dwDst, int iBy)
Definition: StdColors.h:82
void BltAlpha(DWORD &dwDst, DWORD dwSrc)
Definition: StdColors.h:31
bool rgb2xyY(double r, double g, double b, double *px, double *py, double *pY)
Definition: StdColors.h:146
void BltAlphaAdd(DWORD &dwDst, DWORD dwSrc)
Definition: StdColors.h:42
#define X(sdl, oc)
uint32_t RGBA(uint32_t r, uint32_t g, uint32_t b, uint32_t a)
Definition: StdColors.h:22
uint32_t DWORD
DWORD PlrClr2TxtClr(DWORD dwClr)
Definition: StdColors.h:104
bool RGB2rgb(int R, int G, int B, double *pr, double *pg, double *pb, double gamma=2.2)
Definition: StdColors.h:173
void ModulateClrA(DWORD &dwDst, DWORD dwMod)
Definition: StdColors.h:65