objects/palette.c

   1 /*
   2  * GDI palette objects
   3  *
   4  * Copyright 1993,1994 Alexandre Julliard
   5  */
   6
   7 static char Copyright[] = "Copyright  Alexandre Julliard, 1993,1994";
   8
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <limits.h>
  12 /*
  13 #ifdef linux
  14 #include <values.h>
  15 #endif
  16 */
  17
  18 #if !defined  (MAXINT)
  19 #include <limits.h>
  20 #define MAXINT INT_MAX
  21 #endif
  22
  23 #include <X11/Xlib.h>
  24 #include "gdi.h"
  25
  26 extern void COLOR_SetMapping( DC *dc, HANDLE map, WORD size );  /* color.c */
  27
  28 extern Colormap COLOR_WinColormap;
  29
  30
  31 /***********************************************************************
  32  *           CreatePalette    (GDI.360)
  33  */
  34 HPALETTE CreatePalette( LOGPALETTE * palette )
  35 {
  36     PALETTEOBJ * palettePtr;
  37     HPALETTE hpalette;
  38     int size;
  39
  40     size = sizeof(LOGPALETTE) + (palette->palNumEntries - 1) * sizeof(PALETTEENTRY);
  41     hpalette = GDI_AllocObject( sizeof(GDIOBJHDR) + size, PALETTE_MAGIC );
  42     if (!hpalette) return 0;
  43     palettePtr = (PALETTEOBJ *) GDI_HEAP_ADDR( hpalette );
  44     memcpy( &palettePtr->logpalette, palette, size );
  45     return hpalette;
  46 }
  47
  48
  49 /***********************************************************************
  50  *           GetPaletteEntries    (GDI.363)
  51  */
  52 WORD GetPaletteEntries( HPALETTE hpalette, WORD start, WORD count,
  53                         LPPALETTEENTRY entries )
  54 {
  55     PALETTEOBJ * palPtr;
  56     int numEntries;
  57
  58     palPtr = (PALETTEOBJ *) GDI_GetObjPtr( hpalette, PALETTE_MAGIC );
  59     if (!palPtr) return 0;
  60     numEntries = palPtr->logpalette.palNumEntries;
  61     if (start >= numEntries) return 0;
  62     if (start+count > numEntries) count = numEntries - start;
  63     memcpy( entries, &palPtr->logpalette.palPalEntry[start],
  64             count * sizeof(PALETTEENTRY) );
  65     return count;
  66 }
  67
  68
  69 /***********************************************************************
  70  *           SetPaletteEntries    (GDI.364)
  71  */
  72 WORD SetPaletteEntries( HPALETTE hpalette, WORD start, WORD count,
  73                         LPPALETTEENTRY entries )
  74 {
  75     PALETTEOBJ * palPtr;
  76     int numEntries;
  77
  78     palPtr = (PALETTEOBJ *) GDI_GetObjPtr( hpalette, PALETTE_MAGIC );
  79     if (!palPtr) return 0;
  80     numEntries = palPtr->logpalette.palNumEntries;
  81     if (start >= numEntries) return 0;
  82     if (start+count > numEntries) count = numEntries - start;
  83     memcpy( &palPtr->logpalette.palPalEntry[start], entries,
  84             count * sizeof(PALETTEENTRY) );
  85     return count;
  86 }
  87
  88
  89 /***********************************************************************
  90  *           GetSystemPaletteEntries    (GDI.375)
  91  */
  92 WORD GetSystemPaletteEntries( HDC hdc, WORD start, WORD count,
  93                               LPPALETTEENTRY entries )
  94 {
  95     WORD i;
  96     DC *dc;
  97     XColor color;
  98
  99     if (!(dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC ))) return 0;
 100     if (start >= dc->w.devCaps->sizePalette) return 0;
 101     if (start+count >= dc->w.devCaps->sizePalette)
 102         count = dc->w.devCaps->sizePalette - start;
 103     for (i = 0; i < count; i++)
 104     {
 105         color.pixel = start + i;
 106         XQueryColor( display, COLOR_WinColormap, &color );
 107         entries[i].peRed   = color.red >> 8;
 108         entries[i].peGreen = color.green >> 8;
 109         entries[i].peBlue  = color.blue >> 8;
 110         entries[i].peFlags = 0;
 111     }
 112     return count;
 113 }
 114
 115
 116 /***********************************************************************
 117  *           GetNearestPaletteIndex    (GDI.370)
 118  */
 119 WORD GetNearestPaletteIndex( HPALETTE hpalette, COLORREF color )
 120 {
 121     int i, minDist, dist;
 122     WORD index = 0;
 123     BYTE r, g, b;
 124     PALETTEENTRY * entry;
 125     PALETTEOBJ * palPtr;
 126
 127     palPtr = (PALETTEOBJ *) GDI_GetObjPtr( hpalette, PALETTE_MAGIC );
 128     if (!palPtr) return 0;
 129
 130     if ((COLOR_WinColormap != DefaultColormapOfScreen(screen)) &&
 131         (hpalette == STOCK_DEFAULT_PALETTE))
 132     {
 133         if ((color & 0xffffff) == 0) return 0;  /* Entry 0 is black */
 134         if ((color & 0xffffff) == 0xffffff)     /* Max entry is white */
 135             return palPtr->logpalette.palNumEntries - 1;
 136     }
 137
 138     r = GetRValue(color);
 139     g = GetGValue(color);
 140     b = GetBValue(color);
 141
 142     entry = palPtr->logpalette.palPalEntry;
 143     for (i = 0, minDist = MAXINT; minDist !=0 &&
 144          i < palPtr->logpalette.palNumEntries ; i++)
 145     {
 146         if (entry->peFlags != 0xff)
 147         {
 148             dist = (r - entry->peRed) * (r - entry->peRed) +
 149                    (g - entry->peGreen) * (g - entry->peGreen) +
 150                    (b - entry->peBlue) * (b - entry->peBlue);
 151             if (dist < minDist)
 152             {
 153                 minDist = dist;
 154                 index = i;
 155             }
 156         }
 157         entry++;
 158     }
 159 #ifdef DEBUG_GDI
 160     printf( "GetNearestPaletteIndex(%x,%06x) : returning %d\n",
 161              hpalette, color, index );
 162 #endif
 163     return index;
 164 }
 165
 166
 167 /***********************************************************************
 168  *           PALETTE_GetObject
 169  */
 170 int PALETTE_GetObject( PALETTEOBJ * palette, int count, LPSTR buffer )
 171 {
 172     if (count > sizeof(WORD)) count = sizeof(WORD);
 173     memcpy( buffer, &palette->logpalette.palNumEntries, count );
 174     return count;
 175 }
 176
 177
 178 /***********************************************************************
 179  *           GDISelectPalette    (GDI.361)
 180  */
 181 HPALETTE GDISelectPalette( HDC hdc, HPALETTE hpal )
 182 {
 183     HPALETTE prev;
 184     DC *dc;
 185
 186 #ifdef DEBUG_PALETTE
 187     printf( "GDISelectPalette: %d %d\n", hdc, hpal );
 188 #endif
 189     if (!(dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC ))) return 0;
 190     prev = dc->w.hPalette;
 191     dc->w.hPalette = hpal;
 192     if (hpal != STOCK_DEFAULT_PALETTE) COLOR_SetMapping( dc, 0, 0 );
 193     else RealizeDefaultPalette( hdc );  /* Always realize default palette */
 194     return prev;
 195 }
 196
 197
 198 /***********************************************************************
 199  *           GDIRealizePalette    (GDI.362)
 200  */
 201 UINT GDIRealizePalette( HDC hdc )
 202 {
 203 #ifdef DEBUG_PALETTE
 204     printf( "GDIRealizePalette: %d\n", hdc );
 205 #endif
 206     return 0;
 207 }
 208
 209
 210 /***********************************************************************
 211  *           SelectPalette    (USER.282)
 212  */
 213 HPALETTE SelectPalette(HDC hDC, HPALETTE hPal, BOOL bForceBackground)
 214 {
 215     return GDISelectPalette( hDC, hPal );
 216 }
 217
 218
 219 /***********************************************************************
 220  *           RealizePalette    (USER.283)
 221  */
 222 UINT RealizePalette(HDC hDC)
 223 {
 224     return GDIRealizePalette( hDC );
 225 }
 226