rom/graphics/graphics_misc.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Code for miscellaneous operations needed bz graphics
   6     Lang: english
   7 */
   8
   9 #include <proto/exec.h>
  10 #include <proto/graphics.h>
  11 #include <clib/macros.h>
  12 #include <exec/memory.h>
  13 #include <graphics/text.h>
  14 #include <graphics/rastport.h>
  15 #include "graphics_intern.h"
  16
  17
  18
  19 BOOL pattern_pen(struct RastPort *rp, WORD x, WORD y, ULONG apen, ULONG bpen, ULONG *pixval_ptr, struct GfxBase *GfxBase)
  20 {
  21     ULONG idx, mask;
  22     ULONG set_pixel, pixval = 0;
  23
  24     ULONG drmd = GetDrMd(rp);
  25     ULONG pattern_height = 1L << ABS(rp->AreaPtSz);
  26     const UBYTE *apt = (UBYTE *)rp->AreaPtrn;
  27
  28
  29     idx = COORD_TO_BYTEIDX(x & 0x0F, y & (pattern_height - 1), 2);
  30     mask = XCOORD_TO_MASK( x );
  31
  32 /* kprintf("palette_pen: idx=%d, mask=%d,apen=%d, bpen=%d, drmd=%d, apt[idx]=%d\n"
  33         , idx, mask, apen, bpen, drmd, apt[idx]);
  34 */
  35     /* Mono- or multicolor ? */
  36     if (rp->AreaPtSz > 0)
  37     {
  38         /* mono */
  39         set_pixel = apt[idx] & mask;
  40         if (drmd & INVERSVID)
  41             set_pixel = ((set_pixel != 0) ? 0UL : 1UL );
  42
  43         if (set_pixel)
  44         {
  45             /* Use FGPen to render */
  46             pixval = apen;
  47 /* kprintf("use apen\n");
  48 */      }
  49         else
  50         {
  51             if ((drmd & JAM2) != 0)
  52             {
  53                 pixval = bpen;
  54                 set_pixel = TRUE;
  55 /* kprintf("use bpen\n");
  56 */          }
  57             else
  58             {
  59                 /* Do not set pixel */
  60                 set_pixel = FALSE;
  61             }
  62
  63         }
  64
  65
  66     }
  67     else
  68     {
  69         UBYTE i, depth;
  70         ULONG plane_size, pen_mask = 0;
  71         const UBYTE *plane;
  72
  73         plane_size = (/* bytesperrow = */ 2 ) * pattern_height;
  74         depth = GetBitMapAttr(rp->BitMap, BMA_DEPTH);
  75
  76         plane = apt;
  77
  78         /* multicolored pattern, get pixel from all planes */
  79         for (i = 0; i < depth; i ++)
  80         {
  81
  82             pen_mask <<= 1;
  83
  84             if ((plane[idx] & mask) != 0)
  85                 pixval |= pen_mask;
  86         }
  87         plane += plane_size;
  88
  89         set_pixel = TRUE;
  90     }
  91
  92     if (set_pixel)
  93         *pixval_ptr = pixval;
  94
  95     return set_pixel;
  96 }