rom/graphics/attachpalextra.c

   1 /*
   2     Copyright © 1995-2007, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Graphics function AttachPalExtra()
   6     Lang: english
   7 */
   8
   9 #include <proto/exec.h>
  10 #include <graphics/view.h>
  11 #include "graphics_intern.h"
  12
  13 /*****************************************************************************
  14
  15     NAME */
  16 #include <proto/graphics.h>
  17
  18         AROS_LH2(LONG, AttachPalExtra,
  19
  20 /*  SYNOPSIS */
  21         AROS_LHA(struct ColorMap *, cm, A0),
  22         AROS_LHA(struct ViewPort *, vp, A1),
  23
  24 /*  LOCATION */
  25         struct GfxBase *, GfxBase, 139, Graphics)
  26
  27 /*  FUNCTION
  28         Allocates a PalExtra structure and attaches it to the
  29         given ColorMap. This function must be called prior to palette
  30         sharing. The PalExtra structure will be freed by FreeColorMap().
  31
  32     INPUTS
  33         cm  - Pointer to a color map structure
  34         vp  - Pointer to the viewport associated with the ColorMap
  35
  36     RESULT
  37         0 - success
  38         1 - out of memory
  39
  40     NOTES
  41
  42     EXAMPLE
  43
  44     BUGS
  45
  46     SEE ALSO
  47
  48     INTERNALS
  49
  50     HISTORY
  51
  52 *****************************************************************************/
  53 {
  54     AROS_LIBFUNC_INIT
  55
  56     struct PaletteExtra * pe;
  57
  58     if (NULL != cm->PalExtra)
  59         return 0;
  60
  61     pe = AllocMem(sizeof(struct PaletteExtra), MEMF_CLEAR|MEMF_PUBLIC);
  62     if (NULL != pe)
  63     {
  64         /*
  65         ** if you change the number of byte allocated here then you
  66         ** must also make chnages to FreeColorMap()!
  67         */
  68         pe->pe_RefCnt    = AllocMem(cm->Count * sizeof(PalExtra_RefCnt_Type), MEMF_CLEAR);
  69         pe->pe_AllocList = AllocMem(cm->Count * sizeof(PalExtra_AllocList_Type), MEMF_ANY);
  70
  71         if (NULL != pe->pe_RefCnt && NULL != pe->pe_AllocList)
  72         {
  73             UWORD sharablecolors, bmdepth;
  74
  75             sharablecolors = cm->Count;
  76
  77             /* cm->Count may contain more entries than 2 ^ bitmapdepth,
  78                for pointer sprite colors, etc. Sharablecolors OTOH is
  79                limited to 2 ^ bitmapdepth */
  80
  81             bmdepth = GetBitMapAttr(vp->RasInfo->BitMap, BMA_DEPTH);
  82             if (bmdepth < 8)
  83             {
  84                 if ((1L << bmdepth) < sharablecolors)
  85                 {
  86                     sharablecolors = 1L << bmdepth;
  87                 }
  88             }
  89
  90             /* initialize the AllocList BYTE-array */
  91             ULONG i = 0;
  92
  93             /* CHECKME: Should probably say "i < sharablecolors", but might
  94                not actually cause anything bad either, even if it doesn't. */
  95             while (i < cm->Count)
  96             {
  97                 PALEXTRA_ALLOCLIST(pe, i) = (PalExtra_AllocList_Type)i-1;
  98                 i++;
  99             }
 100
 101             /* connect the PaletteExtra structure to the ColorMap */
 102             cm ->PalExtra = pe;
 103
 104             /* initialize the Palette Extra structure */
 105             InitSemaphore(&pe->pe_Semaphore);
 106             pe->pe_ViewPort = vp;
 107
 108             pe->pe_FirstFree   = sharablecolors-1;
 109             pe->pe_NFree       = sharablecolors;
 110             pe->pe_FirstShared = (UWORD)-1;
 111             pe->pe_NShared     = 0;
 112
 113             /* set all entries in the color table to be shareable
 114                pe_SharableColors is not the number of colors but the last color index! */
 115
 116             pe->pe_SharableColors = sharablecolors;
 117
 118         } /* if (NULL != pe->pe_RefCnt && NULL != pe->pe_AllocList) */
 119         else
 120         {
 121             /* some memory allocation failed */
 122             if (pe->pe_RefCnt)
 123                 FreeMem(pe->pe_RefCnt, cm->Count * sizeof(PalExtra_RefCnt_Type));
 124             if (pe->pe_AllocList)
 125                 FreeMem(pe->pe_AllocList, cm->Count* sizeof(PalExtra_AllocList_Type));
 126             FreeMem(pe, sizeof(struct PaletteExtra));
 127             return 1;
 128         }
 129
 130     } /* if (NULL != pe) */
 131     else
 132         return 1;
 133
 134     return 0;
 135
 136     AROS_LIBFUNC_EXIT
 137
 138 } /* AttachPalExtra */