workbench/libs/cgfx/getcybermapattr.c

   1 /*
   2     Copyright © 1995-2017, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: english
   7 */
   8
   9 #include <aros/debug.h>
  10 #include <cybergraphx/cybergraphics.h>
  11 #include <hidd/gfx.h>
  12 #include <proto/oop.h>
  13 #include <proto/utility.h>
  14
  15 #include "cybergraphics_intern.h"
  16 #include "gfxfuncsupport.h"
  17
  18 /*****************************************************************************
  19
  20     NAME */
  21 #include <proto/cybergraphics.h>
  22
  23         AROS_LH2(ULONG, GetCyberMapAttr,
  24
  25 /*  SYNOPSIS */
  26         AROS_LHA(struct BitMap *, bitMap, A0),
  27         AROS_LHA(ULONG          , attribute, D0),
  28
  29 /*  LOCATION */
  30         struct Library *, CyberGfxBase, 16, Cybergraphics)
  31
  32 /*  FUNCTION
  33         Provides information about an RTG bitmap. If you are unsure whether
  34         the bitmap is an RTG one, you must retrieve and check
  35         CYBRMATTR_ISCYBERGFX first, as all other attributes are only allowed
  36         to be retrieved for RTG bitmaps.
  37
  38     INPUTS
  39         bitMap - an RTG bitmap.
  40         attribute - one of the following bitmap attributes:
  41             CYBRMATTR_PIXFMT - the bitmap's pixel format. See
  42                 LockBitMapTagList() for possible values.
  43             CYBRMATTR_WIDTH - the bitmap's width (in pixels).
  44             CYBRMATTR_HEIGHT - the bitmap's height (in pixels).
  45             CYBRMATTR_DEPTH - the number of bits per pixel.
  46             CYBRMATTR_BPPIX - the number of bytes per pixel.
  47             CYBRMATTR_XMOD - the number of bytes per row.
  48             CYBRMATTR_ISCYBERGFX - TRUE only if the bitmap is an RTG one.
  49             CYBRMATTR_ISLINEARMEM - TRUE only if the bitmap's display buffer
  50                 is linear.
  51             CYBRMATTR_COLORMAP - the bitmap's color map.
  52
  53     RESULT
  54         value - the value associated with the requested attribute.
  55
  56     NOTES
  57         If an unknown attribute is requested, -1 is returned.
  58
  59     EXAMPLE
  60
  61     BUGS
  62         CYBRMATTR_COLORMAP is unimplemented.
  63
  64     SEE ALSO
  65
  66     INTERNALS
  67
  68 *****************************************************************************/
  69 {
  70     AROS_LIBFUNC_INIT
  71
  72     OOP_Object *bm_obj = NULL;
  73     OOP_Object *pf = NULL;
  74
  75     IPTR retval;
  76
  77     if (IS_HIDD_BM(bitMap))
  78     {
  79         bm_obj = HIDD_BM_OBJ(bitMap);
  80         OOP_GetAttr(bm_obj, aHidd_BitMap_PixFmt, (IPTR *)&pf);
  81     }
  82
  83     switch (attribute) {
  84     case CYBRMATTR_XMOD:
  85         if (bm_obj)
  86             OOP_GetAttr(bm_obj, aHidd_BitMap_BytesPerRow, &retval);
  87         else
  88             retval = bitMap->BytesPerRow;
  89         break;
  90
  91     case CYBRMATTR_BPPIX:
  92         if (pf)
  93             OOP_GetAttr(pf, aHidd_PixFmt_BytesPerPixel, &retval);
  94         else
  95             retval = 0;
  96         break;
  97
  98     case CYBRMATTR_PIXFMT:
  99     case CYBRMATTR_PIXFMT_ALPHA:
 100         if (pf)
 101         {
 102             OOP_GetAttr(pf, aHidd_PixFmt_CgxPixFmt, &retval);
 103
 104             /* Backwards compatibility kludge. To be removed.
 105                Used only by Cairo, do not use CYBRMATTR_PIXFMT_ALPHA
 106                anywhere else. */
 107             if (attribute == CYBRMATTR_PIXFMT_ALPHA)
 108             {
 109                 IPTR stdpf;
 110
 111                 OOP_GetAttr(pf, aHidd_PixFmt_StdPixFmt, &stdpf);
 112                 if ((stdpf >= vHidd_StdPixFmt_0RGB32) && (stdpf >= vHidd_StdPixFmt_0BGR32))
 113                     retval += 91;
 114             }
 115
 116             D(bug("[GetCyberMapAttr] Pixel format is %d\n", retval));
 117         }
 118         else
 119             retval = -1;
 120         break;
 121
 122     case CYBRMATTR_WIDTH:
 123         retval = GetBitMapAttr(bitMap, BMA_WIDTH);
 124         break;
 125
 126     case CYBRMATTR_HEIGHT:
 127         retval = GetBitMapAttr(bitMap, BMA_HEIGHT);
 128         break;
 129
 130     case CYBRMATTR_DEPTH:
 131         retval = GetBitMapAttr(bitMap, BMA_DEPTH);
 132         break;
 133
 134     case CYBRMATTR_ISCYBERGFX:
 135         retval = bm_obj ? TRUE : FALSE;
 136         break;
 137
 138     case CYBRMATTR_ISLINEARMEM:
 139         if (bm_obj)
 140             OOP_GetAttr(bm_obj, aHidd_BitMap_IsLinearMem, &retval);
 141         else
 142             retval = TRUE;
 143         break;
 144
 145     default:
 146         D(bug("!!! UNKNOWN ATTRIBUTE PASSED TO GetCyberMapAttr()\n"));
 147         break;
 148     } /* switch (attribute) */
 149
 150     return retval;
 151
 152     AROS_LIBFUNC_EXIT
 153 } /* GetCyberMapAttr */