rom/graphics/setrgbconversionfunctiona.c

   1 /*
   2     Copyright  1995-2007, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Function to replace pixel conversion routine
   6     Lang: english
   7 */
   8
   9 #include "graphics_intern.h"
  10 #include <proto/graphics.h>
  11 #include <proto/oop.h>
  12
  13 /*****************************************************************************
  14
  15     NAME */
  16
  17         AROS_LH4(APTR, SetRGBConversionFunctionA,
  18
  19 /*  SYNOPSIS */
  20         AROS_LHA(ULONG, srcPixFmt, D0),
  21         AROS_LHA(ULONG, dstPixFmt, D1),
  22         AROS_LHA(APTR, function, A0),
  23         AROS_LHA(struct TagItem *, tags, A1),
  24
  25 /*  LOCATION */
  26         struct GfxBase *, GfxBase, 198, Graphics)
  27
  28 /*  FUNCTION
  29         Replace RGB pixel conversion routine used for converting from
  30         srcPixFmt to dstPixFmt.
  31
  32     INPUTS
  33         srcPixFmt, dstPixFmt - One of the truecolor vHidd_StdPixFmt_#?
  34         function - function of type HIDDT_RGBConversionFunction
  35         tags - none defined yet
  36
  37     RESULT
  38         Previous conversion routine or (APTR)-1 on failure (bad value
  39         for srcPixFmt and/or dstPixFmt)
  40
  41     NOTES
  42         The conversion function must return 1 if it did the conversion,
  43         or 0 if for whatever reason it did not do it or want to do it.
  44         Then the fallback pixel conversion routine will be used.
  45
  46     EXAMPLE
  47         See AROS/test/patchrgbconv.c
  48
  49     BUGS
  50
  51     SEE ALSO
  52         <hidd/graphics.h>
  53
  54     INTERNALS
  55
  56     HISTORY
  57
  58 *****************************************************************************/
  59 {
  60     AROS_LIBFUNC_INIT
  61
  62     (void)tags;
  63     OOP_Object *bm = SDD(GfxBase)->bm_bak;
  64
  65     if (!bm)
  66         bm = SDD(GfxBase)->framebuffer;
  67     if (!bm)
  68         return NULL;
  69
  70     return (APTR)HIDD_BM_SetRGBConversionFunction(bm,
  71                                                   (HIDDT_StdPixFmt)srcPixFmt,
  72                                                   (HIDDT_StdPixFmt)dstPixFmt,
  73                                                   (HIDDT_RGBConversionFunction)function);
  74
  75     AROS_LIBFUNC_EXIT
  76
  77 } /* SetRGBConversionFunctionA */