objects/color.c

   1 /*
   2  * Color functions
   3  *
   4  * Copyright 1993 Alexandre Julliard
   5  * Copyright 1996 Alex Korobka
   6  */
   7
   8 #include "color.h"
   9 #include "debugtools.h"
  10 #include "palette.h"
  11 #include "windef.h"
  12
  13 DEFAULT_DEBUG_CHANNEL(palette)
  14
  15
  16 /***********************************************************************
  17  * System color space.
  18  *
  19  * First 10 and last 10 colors in COLOR_sysPalette are
  20  * "guarded". RealizePalette changes only the rest of colorcells. For
  21  * currently inactive window it changes only DC palette mappings.
  22  */
  23
  24 PALETTEENTRY *COLOR_sysPal = NULL; /* current system palette */
  25
  26 int COLOR_gapStart = 256;
  27 int COLOR_gapEnd = -1;
  28 int COLOR_gapFilled = 0;
  29 int COLOR_max = 256;
  30
  31 const PALETTEENTRY COLOR_sysPalTemplate[NB_RESERVED_COLORS] =
  32 {
  33     /* first 10 entries in the system palette */
  34     /* red  green blue  flags */
  35     { 0x00, 0x00, 0x00, PC_SYS_USED },
  36     { 0x80, 0x00, 0x00, PC_SYS_USED },
  37     { 0x00, 0x80, 0x00, PC_SYS_USED },
  38     { 0x80, 0x80, 0x00, PC_SYS_USED },
  39     { 0x00, 0x00, 0x80, PC_SYS_USED },
  40     { 0x80, 0x00, 0x80, PC_SYS_USED },
  41     { 0x00, 0x80, 0x80, PC_SYS_USED },
  42     { 0xc0, 0xc0, 0xc0, PC_SYS_USED },
  43     { 0xc0, 0xdc, 0xc0, PC_SYS_USED },
  44     { 0xa6, 0xca, 0xf0, PC_SYS_USED },
  45
  46     /* ... c_min/2 dynamic colorcells */
  47
  48     /* ... gap (for sparse palettes) */
  49
  50     /* ... c_min/2 dynamic colorcells */
  51
  52     { 0xff, 0xfb, 0xf0, PC_SYS_USED },
  53     { 0xa0, 0xa0, 0xa4, PC_SYS_USED },
  54     { 0x80, 0x80, 0x80, PC_SYS_USED },
  55     { 0xff, 0x00, 0x00, PC_SYS_USED },
  56     { 0x00, 0xff, 0x00, PC_SYS_USED },
  57     { 0xff, 0xff, 0x00, PC_SYS_USED },
  58     { 0x00, 0x00, 0xff, PC_SYS_USED },
  59     { 0xff, 0x00, 0xff, PC_SYS_USED },
  60     { 0x00, 0xff, 0xff, PC_SYS_USED },
  61     { 0xff, 0xff, 0xff, PC_SYS_USED }     /* last 10 */
  62 };
  63
  64 /***********************************************************************
  65  *           COLOR_GetSystemPaletteTemplate
  66  */
  67 const PALETTEENTRY* COLOR_GetSystemPaletteTemplate(void)
  68 {
  69     return COLOR_sysPalTemplate;
  70 }
  71
  72 /***********************************************************************
  73  *           COLOR_GetSystemPaletteEntry
  74  */
  75
  76 COLORREF COLOR_GetSystemPaletteEntry(UINT i)
  77 {
  78     return *(COLORREF*)(COLOR_sysPal + i) & 0x00ffffff;
  79 }
  80
  81 /***********************************************************************
  82  *           COLOR_IsSolid
  83  *
  84  * Check whether 'color' can be represented with a solid color.
  85  */
  86 BOOL COLOR_IsSolid( COLORREF color )
  87 {
  88     int i;
  89     const PALETTEENTRY *pEntry = COLOR_sysPal;
  90
  91     if (color & 0xff000000) return TRUE;                /* indexed color */
  92
  93     if (!color || (color == 0xffffff)) return TRUE;     /* black or white */
  94
  95     for (i = 0; i < 256 ; i++, pEntry++)
  96     {
  97       if( i < COLOR_gapStart || i > COLOR_gapEnd )
  98         if ((GetRValue(color) == pEntry->peRed) &&
  99             (GetGValue(color) == pEntry->peGreen) &&
 100             (GetBValue(color) == pEntry->peBlue)) return TRUE;
 101     }
 102     return FALSE;
 103 }
 104
 105 /***********************************************************************
 106  *           COLOR_PaletteLookupPixel
 107  */
 108 int COLOR_PaletteLookupPixel( PALETTEENTRY* palPalEntry, int size,
 109                               int* mapping, COLORREF col, BOOL skipReserved )
 110 {
 111     int i, best = 0, diff = 0x7fffffff;
 112     int r,g,b;
 113
 114     for( i = 0; i < size && diff ; i++ )
 115     {
 116         if( !(palPalEntry[i].peFlags & PC_SYS_USED) ||
 117             (skipReserved && palPalEntry[i].peFlags  & PC_SYS_RESERVED) )
 118             continue;
 119
 120         r = palPalEntry[i].peRed - GetRValue(col);
 121         g = palPalEntry[i].peGreen - GetGValue(col);
 122         b = palPalEntry[i].peBlue - GetBValue(col);
 123
 124         r = r*r + g*g + b*b;
 125
 126         if( r < diff ) { best = i; diff = r; }
 127     }
 128     return (mapping) ? mapping[best] : best;
 129 }
 130
 131 /***********************************************************************
 132  *           COLOR_PaletteLookupExactIndex
 133  */
 134 int COLOR_PaletteLookupExactIndex( PALETTEENTRY* palPalEntry, int size,
 135                                    COLORREF col )
 136 {
 137     int i;
 138     BYTE r = GetRValue(col), g = GetGValue(col), b = GetBValue(col);
 139     for( i = 0; i < size; i++ )
 140     {
 141         if( palPalEntry[i].peFlags & PC_SYS_USED )      /* skips gap */
 142             if( palPalEntry[i].peRed == r &&
 143                 palPalEntry[i].peGreen == g &&
 144                 palPalEntry[i].peBlue == b )
 145                 return i;
 146     }
 147     return -1;
 148 }
 149
 150 /***********************************************************************
 151  *           COLOR_LookupNearestColor
 152  */
 153 COLORREF COLOR_LookupNearestColor( PALETTEENTRY* palPalEntry, int size, COLORREF color )
 154 {
 155   unsigned char         spec_type = color >> 24;
 156   int                   i;
 157
 158   /* we need logical palette for PALETTERGB and PALETTEINDEX colorrefs */
 159
 160   if( spec_type == 2 ) /* PALETTERGB */
 161     color = *(COLORREF*)
 162              (palPalEntry + COLOR_PaletteLookupPixel(palPalEntry,size,NULL,color,FALSE));
 163
 164   else if( spec_type == 1 ) /* PALETTEINDEX */
 165   {
 166     if( (i = color & 0x0000ffff) >= size )
 167       {
 168         WARN("RGB(%lx) : idx %d is out of bounds, assuming NULL\n", color, i);
 169         color = *(COLORREF*)palPalEntry;
 170       }
 171     else color = *(COLORREF*)(palPalEntry + i);
 172   }
 173
 174   color &= 0x00ffffff;
 175   return (0x00ffffff & *(COLORREF*)
 176          (COLOR_sysPal + COLOR_PaletteLookupPixel(COLOR_sysPal, 256, NULL, color, FALSE)));
 177 }