rom/graphics/setrgb4.c

   1 /*
   2     Copyright © 1995-2007, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Set one color register for this Viewport
   6     Lang: english
   7 */
   8 #include "graphics_intern.h"
   9
  10 /*****************************************************************************
  11
  12     NAME */
  13 #include <graphics/view.h>
  14 #include <proto/graphics.h>
  15
  16         AROS_LH5(void, SetRGB4,
  17
  18 /*  SYNOPSIS */
  19         AROS_LHA(struct ViewPort *, vp, A0),
  20         AROS_LHA(ULONG            , n, D0),
  21         AROS_LHA(ULONG            , r, D1),
  22         AROS_LHA(ULONG            , g, D2),
  23         AROS_LHA(ULONG            , b, D3),
  24
  25 /*  LOCATION */
  26         struct GfxBase *, GfxBase, 48, Graphics)
  27
  28 /*  FUNCTION
  29         Changes a single color of a viewport.
  30
  31     INPUTS
  32         vp - Modify this viewport
  33         n - Change this color. If the color is outside the range of
  34                 valid colors, it will be ignored.
  35         r, g, b - The new values for the red, green and blue. The
  36                 valid range is from 0x0 (no intensity) to
  37                 0xF (full intensity).
  38
  39     RESULT
  40         If there is a ColorMap for this viewport, then the value will
  41         be stored in the ColorMap.
  42         The selected color register is changed to match your specs.
  43         If the color value is unused then nothing will happen.
  44
  45     NOTES
  46         Lower order bits of the palette specification will be discarded,
  47         depending on the color palette resolution of the target graphics
  48         device. Use 0xf for the full value, 0x7 for 50%,
  49         etc. You can find out the palette range for your screen by
  50         querying the graphics data base.
  51
  52     EXAMPLE
  53
  54     BUGS
  55
  56     SEE ALSO
  57
  58     INTERNALS
  59
  60     HISTORY
  61
  62 *****************************************************************************/
  63 {
  64     AROS_LIBFUNC_INIT
  65
  66     if (!vp)
  67         return;
  68
  69     SetRGB32(vp, n, r * 0x11111111,
  70                     g * 0x11111111,
  71                     b * 0x11111111);
  72
  73     /************************************************************
  74     / This is the code that works correctly on the real thing
  75     struct ColorMap * CM = vp->ColorMap;
  76
  77     / is there a ColorMap connected to the ViewPort??  /
  78     if (NULL != CM)
  79     {
  80       struct View * MyView = ViewAddress();
  81       if(CM->Count > n)
  82       {
  83         WORD * RGBValues = CM->ColorTable;
  84         RGBValues[n] = ((r & 0x000f) << 8) +
  85                        ((g & 0x000f) << 4) +
  86                         (b & 0x000f);
  87       }
  88
  89       / Make the changes visible /
  90       MakeVPort(MyView, MyView->ViewPort);
  91       MrgCop(MyView);
  92       LoadView(MyView);
  93     }
  94     ************************************************************/
  95
  96     AROS_LIBFUNC_EXIT
  97
  98 } /* SetRGB4 */