objects/palette.c

   1 /*
   2  * GDI palette objects
   3  *
   4  * Copyright 1993,1994 Alexandre Julliard
   5  *
   6 static char Copyright[] = "Copyright  Alexandre Julliard, 1993,1994";
   7 */
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <limits.h>
  11
  12 #if !defined  (MAXINT)
  13 #include <limits.h>
  14 #define MAXINT INT_MAX
  15 #endif
  16
  17 #include <X11/Xlib.h>
  18 #include "color.h"
  19 #include "palette.h"
  20 #include "stddebug.h"
  21 /* #define DEBUG_PALETTE */
  22 #include "debug.h"
  23
  24 static WORD SystemPaletteUse = SYSPAL_STATIC;   /* currently not considered */
  25
  26 /***********************************************************************
  27  *           CreatePalette    (GDI.360)
  28  */
  29 HPALETTE CreatePalette( LOGPALETTE * palette )
  30 {
  31     PALETTEOBJ * palettePtr;
  32     HPALETTE hpalette;
  33     int size;
  34
  35     size = sizeof(LOGPALETTE) + (palette->palNumEntries - 1) * sizeof(PALETTEENTRY);
  36     hpalette = GDI_AllocObject( sizeof(GDIOBJHDR) + size, PALETTE_MAGIC );
  37     if (!hpalette) return 0;
  38     palettePtr = (PALETTEOBJ *) GDI_HEAP_LIN_ADDR( hpalette );
  39     memcpy( &palettePtr->logpalette, palette, size );
  40     return hpalette;
  41 }
  42
  43
  44 /***********************************************************************
  45  *           GetPaletteEntries    (GDI.363)
  46  */
  47 WORD GetPaletteEntries( HPALETTE hpalette, WORD start, WORD count,
  48                         LPPALETTEENTRY entries )
  49 {
  50     PALETTEOBJ * palPtr;
  51     int numEntries;
  52
  53     palPtr = (PALETTEOBJ *) GDI_GetObjPtr( hpalette, PALETTE_MAGIC );
  54     if (!palPtr) return 0;
  55     numEntries = palPtr->logpalette.palNumEntries;
  56     if (start >= numEntries) return 0;
  57     if (start+count > numEntries) count = numEntries - start;
  58     memcpy( entries, &palPtr->logpalette.palPalEntry[start],
  59             count * sizeof(PALETTEENTRY) );
  60     return count;
  61 }
  62
  63
  64 /***********************************************************************
  65  *           SetPaletteEntries    (GDI.364)
  66  */
  67 WORD SetPaletteEntries( HPALETTE hpalette, WORD start, WORD count,
  68                         LPPALETTEENTRY entries )
  69 {
  70     PALETTEOBJ * palPtr;
  71     int numEntries;
  72
  73     palPtr = (PALETTEOBJ *) GDI_GetObjPtr( hpalette, PALETTE_MAGIC );
  74     if (!palPtr) return 0;
  75     numEntries = palPtr->logpalette.palNumEntries;
  76     if (start >= numEntries) return 0;
  77     if (start+count > numEntries) count = numEntries - start;
  78     memcpy( &palPtr->logpalette.palPalEntry[start], entries,
  79             count * sizeof(PALETTEENTRY) );
  80     return count;
  81 }
  82
  83
  84 /***********************************************************************
  85  *           SetSystemPaletteUse    (GDI.373)
  86  *      Should this be per DC rather than system wide?
  87  *  Currently, it does not matter as the use is only set and returned,
  88  *  but not taken into account
  89  */
  90 WORD SetSystemPaletteUse( HDC hdc, WORD use)
  91 {
  92          WORD old=SystemPaletteUse;
  93          printf("SetSystemPaletteUse(%04X,%04X) // empty stub !!!\n", hdc, use);
  94          SystemPaletteUse=use;
  95          return old;
  96 }
  97
  98 /***********************************************************************
  99  *           GetSystemPaletteUse    (GDI.374)
 100  */
 101 WORD GetSystemPaletteUse( HDC hdc )
 102 {
 103         printf("GetSystemPaletteUse(%04X) // empty stub !!!\n", hdc);
 104         return SystemPaletteUse;
 105 }
 106
 107
 108 /***********************************************************************
 109  *           GetSystemPaletteEntries    (GDI.375)
 110  */
 111 WORD GetSystemPaletteEntries( HDC hdc, WORD start, WORD count,
 112                               LPPALETTEENTRY entries )
 113 {
 114     WORD i;
 115     DC *dc;
 116     XColor color;
 117
 118     if (!(dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC ))) return 0;
 119     if (start >= dc->w.devCaps->sizePalette) return 0;
 120     if (start+count >= dc->w.devCaps->sizePalette)
 121         count = dc->w.devCaps->sizePalette - start;
 122     for (i = 0; i < count; i++)
 123     {
 124         color.pixel = start + i;
 125         XQueryColor( display, COLOR_WinColormap, &color );
 126         entries[i].peRed   = color.red >> 8;
 127         entries[i].peGreen = color.green >> 8;
 128         entries[i].peBlue  = color.blue >> 8;
 129         entries[i].peFlags = 0;
 130     }
 131     return count;
 132 }
 133
 134
 135 /***********************************************************************
 136  *           GetNearestPaletteIndex    (GDI.370)
 137  */
 138 WORD GetNearestPaletteIndex( HPALETTE hpalette, COLORREF color )
 139 {
 140     int i, minDist, dist;
 141     WORD index = 0;
 142     BYTE r, g, b;
 143     PALETTEENTRY * entry;
 144     PALETTEOBJ * palPtr;
 145
 146     palPtr = (PALETTEOBJ *) GDI_GetObjPtr( hpalette, PALETTE_MAGIC );
 147     if (!palPtr) return 0;
 148
 149     if ((COLOR_WinColormap != DefaultColormapOfScreen(screen)) &&
 150         (hpalette == STOCK_DEFAULT_PALETTE))
 151     {
 152         if ((color & 0xffffff) == 0) return 0;  /* Entry 0 is black */
 153         if ((color & 0xffffff) == 0xffffff)     /* Max entry is white */
 154             return palPtr->logpalette.palNumEntries - 1;
 155     }
 156
 157     r = GetRValue(color);
 158     g = GetGValue(color);
 159     b = GetBValue(color);
 160
 161     entry = palPtr->logpalette.palPalEntry;
 162     for (i = 0, minDist = MAXINT; minDist !=0 &&
 163          i < palPtr->logpalette.palNumEntries ; i++)
 164     {
 165         if (entry->peFlags != 0xff)
 166         {
 167             dist = (r - entry->peRed) * (r - entry->peRed) +
 168                    (g - entry->peGreen) * (g - entry->peGreen) +
 169                    (b - entry->peBlue) * (b - entry->peBlue);
 170             if (dist < minDist)
 171             {
 172                 minDist = dist;
 173                 index = i;
 174             }
 175         }
 176         entry++;
 177     }
 178     dprintf_palette(stddeb,"GetNearestPaletteIndex(%x,%06lx): returning %d\n",
 179              hpalette, color, index );
 180     return index;
 181 }
 182
 183
 184 /***********************************************************************
 185  *           PALETTE_GetObject
 186  */
 187 int PALETTE_GetObject( PALETTEOBJ * palette, int count, LPSTR buffer )
 188 {
 189     if (count > sizeof(WORD)) count = sizeof(WORD);
 190     memcpy( buffer, &palette->logpalette.palNumEntries, count );
 191     return count;
 192 }
 193
 194
 195 /***********************************************************************
 196  *           GDISelectPalette    (GDI.361)
 197  */
 198 HPALETTE GDISelectPalette( HDC hdc, HPALETTE hpal )
 199 {
 200     HPALETTE prev;
 201     DC *dc;
 202
 203     dprintf_palette(stddeb, "GDISelectPalette: %d %d\n", hdc, hpal );
 204     if (!(dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC ))) return 0;
 205     prev = dc->w.hPalette;
 206     dc->w.hPalette = hpal;
 207     if (hpal != STOCK_DEFAULT_PALETTE) COLOR_SetMapping( dc, 0, 0, 0 );
 208     else RealizeDefaultPalette( hdc );  /* Always realize default palette */
 209     return prev;
 210 }
 211
 212
 213 /***********************************************************************
 214  *           GDIRealizePalette    (GDI.362)
 215  */
 216 UINT GDIRealizePalette( HDC hdc )
 217 {
 218     dprintf_palette(stdnimp, "GDIRealizePalette: %d\n", hdc );
 219     return 0;
 220 }
 221
 222
 223 /***********************************************************************
 224  *           SelectPalette    (USER.282)
 225  */
 226 HPALETTE SelectPalette(HDC hDC, HPALETTE hPal, BOOL bForceBackground)
 227 {
 228     return GDISelectPalette( hDC, hPal );
 229 }
 230
 231
 232 /***********************************************************************
 233  *           RealizePalette    (USER.283)
 234  */
 235 UINT RealizePalette(HDC hDC)
 236 {
 237     return GDIRealizePalette( hDC );
 238 }
 239