LCOV - code coverage report
Current view: directory - layout/base - nsCSSColorUtils.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 100 0 0.0 %
Date: 2012-06-02 Functions: 5 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is mozilla.org code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      26                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : /* functions that manipulate colors */
      39                 : 
      40                 : #include "nsCSSColorUtils.h"
      41                 : #include "nsDebug.h"
      42                 : #include <math.h>
      43                 : 
      44                 : // Weird color computing code stolen from winfe which was stolen
      45                 : // from the xfe which was written originally by Eric Bina. So there.
      46                 : 
      47                 : #define RED_LUMINOSITY        299
      48                 : #define GREEN_LUMINOSITY      587
      49                 : #define BLUE_LUMINOSITY       114
      50                 : #define INTENSITY_FACTOR      25
      51                 : #define LIGHT_FACTOR          0
      52                 : #define LUMINOSITY_FACTOR     75
      53                 : 
      54                 : #define MAX_COLOR             255
      55                 : #define COLOR_DARK_THRESHOLD  51
      56                 : #define COLOR_LIGHT_THRESHOLD 204
      57                 : 
      58                 : #define COLOR_LITE_BS_FACTOR 45
      59                 : #define COLOR_LITE_TS_FACTOR 70
      60                 : 
      61                 : #define COLOR_DARK_BS_FACTOR 30
      62                 : #define COLOR_DARK_TS_FACTOR 50
      63                 : 
      64                 : #define LIGHT_GRAY NS_RGB(192, 192, 192)
      65                 : #define DARK_GRAY  NS_RGB(96, 96, 96)
      66                 : #define WHITE      NS_RGB(255, 255, 255)
      67                 : #define BLACK      NS_RGB(0, 0, 0)
      68                 : 
      69                 : #define MAX_BRIGHTNESS  254
      70                 : #define MAX_DARKNESS     0
      71                 : 
      72               0 : void NS_GetSpecial3DColors(nscolor aResult[2],
      73                 :                            nscolor aBackgroundColor,
      74                 :                            nscolor aBorderColor)
      75                 : {
      76                 : 
      77                 :   PRUint8 f0, f1;
      78                 :   PRUint8 r, g, b;
      79                 : 
      80               0 :   PRUint8 rb = NS_GET_R(aBorderColor);
      81               0 :   PRUint8 gb = NS_GET_G(aBorderColor);
      82               0 :   PRUint8 bb = NS_GET_B(aBorderColor);
      83                 : 
      84               0 :   PRUint8 a = NS_GET_A(aBorderColor);
      85                 : 
      86                 :   // This needs to be optimized.
      87                 :   // Calculating background brightness again and again is 
      88                 :   // a waste of time!!!. Just calculate it only once.
      89                 :   // .....somehow!!!
      90                 : 
      91               0 :   PRUint8 red = NS_GET_R(aBackgroundColor);
      92               0 :   PRUint8 green = NS_GET_G(aBackgroundColor);
      93               0 :   PRUint8 blue = NS_GET_B(aBackgroundColor);
      94                 :   
      95               0 :   PRUint8 elementBrightness = NS_GetBrightness(rb,gb,bb);
      96               0 :   PRUint8 backgroundBrightness = NS_GetBrightness(red, green, blue);
      97                 : 
      98                 : 
      99               0 :   if (backgroundBrightness < COLOR_DARK_THRESHOLD) {
     100               0 :     f0 = COLOR_DARK_BS_FACTOR;
     101               0 :     f1 = COLOR_DARK_TS_FACTOR;
     102               0 :         if(elementBrightness == MAX_DARKNESS)
     103                 :         {
     104               0 :        rb = NS_GET_R(DARK_GRAY);
     105               0 :        gb = NS_GET_G(DARK_GRAY);
     106               0 :        bb = NS_GET_B(DARK_GRAY);
     107                 :         }
     108               0 :   }else if (backgroundBrightness > COLOR_LIGHT_THRESHOLD) {
     109               0 :     f0 = COLOR_LITE_BS_FACTOR;
     110               0 :     f1 = COLOR_LITE_TS_FACTOR;
     111               0 :         if(elementBrightness == MAX_BRIGHTNESS)
     112                 :         {
     113               0 :        rb = NS_GET_R(LIGHT_GRAY);
     114               0 :        gb = NS_GET_G(LIGHT_GRAY);
     115               0 :        bb = NS_GET_B(LIGHT_GRAY);
     116                 :         }
     117                 :   }else {
     118                 :     f0 = COLOR_DARK_BS_FACTOR +
     119                 :       (backgroundBrightness *
     120               0 :        (COLOR_LITE_BS_FACTOR - COLOR_DARK_BS_FACTOR) / MAX_COLOR);
     121                 :     f1 = COLOR_DARK_TS_FACTOR +
     122                 :       (backgroundBrightness *
     123               0 :        (COLOR_LITE_TS_FACTOR - COLOR_DARK_TS_FACTOR) / MAX_COLOR);
     124                 :   }
     125                 :   
     126                 :   
     127               0 :   r = rb - (f0 * rb / 100);
     128               0 :   g = gb - (f0 * gb / 100);
     129               0 :   b = bb - (f0 * bb / 100);
     130               0 :   aResult[0] = NS_RGBA(r, g, b, a);
     131                 : 
     132               0 :   r = rb + (f1 * (MAX_COLOR - rb) / 100);
     133               0 :   g = gb + (f1 * (MAX_COLOR - gb) / 100);
     134               0 :   b = bb + (f1 * (MAX_COLOR - bb) / 100);
     135               0 :   aResult[1] = NS_RGBA(r, g, b, a);
     136               0 : }
     137                 : 
     138               0 : int NS_GetBrightness(PRUint8 aRed, PRUint8 aGreen, PRUint8 aBlue)
     139                 : {
     140                 : 
     141               0 :   PRUint8 intensity = (aRed + aGreen + aBlue) / 3;
     142                 : 
     143               0 :   PRUint8 luminosity = NS_GetLuminosity(NS_RGB(aRed, aGreen, aBlue)) / 1000;
     144                 :  
     145                 :   return ((intensity * INTENSITY_FACTOR) +
     146               0 :           (luminosity * LUMINOSITY_FACTOR)) / 100;
     147                 : }
     148                 : 
     149               0 : PRInt32 NS_GetLuminosity(nscolor aColor)
     150                 : {
     151                 :   // When aColor is not opaque, the perceived luminosity will depend
     152                 :   // on what color(s) aColor is ultimately drawn on top of, which we
     153                 :   // do not know.
     154               0 :   NS_ASSERTION(NS_GET_A(aColor) == 255,
     155                 :                "impossible to compute luminosity of a non-opaque color");
     156                 :   
     157                 :   return (NS_GET_R(aColor) * RED_LUMINOSITY +
     158                 :           NS_GET_G(aColor) * GREEN_LUMINOSITY +
     159               0 :           NS_GET_B(aColor) * BLUE_LUMINOSITY);
     160                 : }
     161                 : 
     162                 : // Function to convert RGB color space into the HSV colorspace
     163                 : // Hue is the primary color defined from 0 to 359 degrees
     164                 : // Saturation is defined from 0 to 255.  The higher the number.. the deeper
     165                 : // the color Value is the brightness of the color. 0 is black, 255 is white.
     166               0 : void NS_RGB2HSV(nscolor aColor, PRUint16 &aHue, PRUint16 &aSat,
     167                 :                 PRUint16 &aValue, PRUint8 &aAlpha)
     168                 : {
     169                 :   PRUint8 r, g, b;
     170                 :   PRInt16 delta, min, max, r1, b1, g1;
     171                 :   float   hue;
     172                 : 
     173               0 :   r = NS_GET_R(aColor);
     174               0 :   g = NS_GET_G(aColor);
     175               0 :   b = NS_GET_B(aColor);
     176                 : 
     177               0 :   if (r>g) {
     178               0 :     max = r;
     179               0 :     min = g;
     180                 :   } else {
     181               0 :     max = g;
     182               0 :     min = r;
     183                 :   }
     184                 : 
     185               0 :   if (b>max) {
     186               0 :     max = b;
     187                 :   }
     188               0 :   if (b<min) {
     189               0 :     min = b;
     190                 :   }
     191                 : 
     192                 :   // value or brightness will always be the max of all the colors(RGB)
     193               0 :   aValue = max;   
     194               0 :   delta = max-min;
     195               0 :   aSat = (max!=0)?((delta*255)/max):0;
     196               0 :   r1 = r;
     197               0 :   b1 = b;
     198               0 :   g1 = g;
     199                 : 
     200               0 :   if (aSat==0) {
     201               0 :     hue = 1000;
     202                 :   } else {
     203               0 :     if(r==max){
     204               0 :       hue=(float)(g1-b1)/(float)delta;
     205               0 :     } else if (g1==max) {
     206               0 :       hue= 2.0f+(float)(b1-r1)/(float)delta;
     207                 :     } else { 
     208               0 :       hue = 4.0f+(float)(r1-g1)/(float)delta;
     209                 :     }
     210                 :   }
     211                 : 
     212               0 :   if(hue<999) {
     213               0 :     hue*=60;
     214               0 :     if(hue<0){
     215               0 :       hue+=360;
     216                 :     }
     217                 :   } else {
     218               0 :     hue=0;
     219                 :   }
     220                 : 
     221               0 :   aHue = (PRUint16)hue;
     222                 : 
     223               0 :   aAlpha = NS_GET_A(aColor);
     224               0 : }
     225                 : 
     226                 : // Function to convert HSV color space into the RGB colorspace
     227                 : // Hue is the primary color defined from 0 to 359 degrees
     228                 : // Saturation is defined from 0 to 255.  The higher the number.. the deeper
     229                 : // the color Value is the brightness of the color. 0 is black, 255 is white.
     230               0 : void NS_HSV2RGB(nscolor &aColor, PRUint16 aHue, PRUint16 aSat, PRUint16 aValue,
     231                 :                 PRUint8 aAlpha)
     232                 : {
     233               0 :   PRUint16  r = 0, g = 0, b = 0;
     234                 :   PRUint16  i, p, q, t;
     235                 :   double    h, f, percent;
     236                 : 
     237               0 :   if ( aSat == 0 ){
     238                 :     // achromatic color, no hue is defined
     239               0 :     r = aValue;
     240               0 :     g = aValue;
     241               0 :     b = aValue;
     242                 :   } else {
     243                 :     // hue in in degrees around the color wheel defined from
     244                 :     // 0 to 360 degrees.  
     245               0 :     if (aHue >= 360) {
     246               0 :       aHue = 0;
     247                 :     }
     248                 : 
     249                 :     // we break the color wheel into 6 areas.. these
     250                 :     // areas define how the saturation and value define the color.
     251                 :     // reds behave differently than the blues
     252               0 :     h = (double)aHue / 60.0;
     253               0 :     i = (PRUint16) floor(h);
     254               0 :     f = h-(double)i;
     255               0 :     percent = ((double)aValue/255.0);   // this needs to be a value from 0 to 1, so a percentage
     256                 :                                         // can be calculated of the saturation.
     257               0 :     p = (PRUint16)(percent*(255-aSat));
     258               0 :     q = (PRUint16)(percent*(255-(aSat*f)));
     259               0 :     t = (PRUint16)(percent*(255-(aSat*(1.0-f))));
     260                 : 
     261                 :     // i is guaranteed to never be larger than 5.
     262               0 :     switch(i){
     263               0 :       case 0: r = aValue; g = t; b = p;break;
     264               0 :       case 1: r = q; g = aValue; b = p;break;
     265               0 :       case 2: r = p; g = aValue; b = t;break;
     266               0 :       case 3: r = p; g = q; b = aValue;break;
     267               0 :       case 4: r = t; g = p; b = aValue;break;
     268               0 :       case 5: r = aValue; g = p; b = q;break;
     269                 :     }
     270                 :   }
     271               0 :   aColor = NS_RGBA(r, g, b, aAlpha);
     272               0 : }

Generated by: LCOV version 1.7