rom/graphics/gels_internal.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Internal function for improved gels handling.
   6     Lang: english
   7 */
   8 #include <aros/debug.h>
   9
  10 #include <graphics/gels.h>
  11 #include <graphics/rastport.h>
  12 #include <exec/memory.h>
  13 #include <proto/graphics.h>
  14 #include <proto/exec.h>
  15 #include "gels_internal.h"
  16 #include "graphics_intern.h"
  17
  18 struct IntVSprite * _CreateIntVSprite(struct VSprite * vs,
  19                                       struct RastPort * rp,
  20                                       struct GfxBase * GfxBase)
  21 {
  22         struct IntVSprite * ivs = AllocMem(sizeof(struct IntVSprite),
  23                                            MEMF_CLEAR);
  24         if (NULL != ivs) {
  25                 ivs -> VSprite = vs;
  26                 vs->IntVSprite = ivs;
  27
  28                 /*
  29                  * Don't call the validate function when rp=NULL, i.e. when
  30                  * called by InitGels().
  31                  */
  32                 if (NULL != rp)
  33                         _ValidateIntVSprite(ivs,
  34                                             rp,
  35                                             FALSE,
  36                                             GfxBase);
  37         }
  38         return ivs;
  39 }
  40
  41
  42 VOID _DeleteIntVSprite(struct VSprite * vs,
  43                        struct GfxBase * GfxBase)
  44 {
  45         struct IntVSprite * ivs = vs->IntVSprite;
  46
  47         if (NULL != ivs) {
  48                 if (NULL != ivs->ImageData)
  49                         FreeBitMap(ivs->ImageData);
  50
  51                 if (NULL != ivs->SaveBuffer)
  52                         FreeBitMap(ivs->SaveBuffer);
  53
  54                 FreeMem(ivs, sizeof(struct IntVSprite));
  55                 vs->IntVSprite = NULL;
  56         }
  57 }
  58
  59
  60 /*
  61  * Check whether the appearance of the VSprite has been changed
  62  * somehow. If for example the Image Data has changed, then
  63  * I will try to update the BitMap of the IntVSprite structure
  64  * to the new image data.
  65  */
  66 BOOL _ValidateIntVSprite(struct IntVSprite * ivs,
  67                          struct RastPort * rp,
  68                          BOOL force_change,
  69                          struct GfxBase * GfxBase)
  70 {
  71         struct VSprite * vs = ivs->VSprite;
  72
  73         /* We don't support a depth > 32 currently */
  74         if (vs->Depth > 32)
  75             return FALSE;
  76
  77         /*
  78          * Check whether the ImageData pointer has changed
  79          */
  80         if (vs->ImageData != ivs->OrigImageData ||
  81             force_change) {
  82                 /* Why the weird struct? Well, if we InitBitMap()
  83                  * a Depth > 8 on a plain BitMap, we'll scribble over
  84                  * our stack. Therefore we pad one some extra IPTRs
  85                  * to the end.
  86                  */
  87                 struct {
  88                         struct BitMap bm;
  89                         IPTR planes[32-8];
  90                 } x = {};
  91
  92 #if 0
  93 kprintf("%s: Imagedata has changed (old:%p-new:%p)!\n",
  94         __FUNCTION__,
  95         vs->ImageData,
  96         ivs->OrigImageData);
  97 kprintf("PlanePick: %02x, rp->BitMap:%p\n",vs->PlanePick,rp->BitMap);
  98 #endif
  99                 /*
 100                  * Only need to get a new bitmap if
 101                  * something in the size of the bob has changed.
 102                  */
 103                 if ((ivs->Width  != vs->Width )  ||
 104                     (ivs->Height != vs->Height)  ||
 105                     (ivs->Depth  != vs->Depth )    ) {
 106                         if (NULL != ivs->ImageData)
 107                                 FreeBitMap(ivs->ImageData);
 108
 109                         if (NULL != ivs->SaveBuffer)
 110                                 FreeBitMap(ivs->SaveBuffer);
 111                         /*
 112                          * Now get a new bitmap
 113                          */
 114
 115                         ivs->ImageData = AllocBitMap(vs->Width<<4,
 116                                                      vs->Height,
 117                                                      vs->Depth,
 118                                                      BMF_CLEAR,
 119                                                      rp->BitMap);
 120
 121                         ivs->SaveBuffer = AllocBitMap(vs->Width<<4,
 122                                                       vs->Height,
 123                                                       vs->Depth,
 124                                                       0,
 125                                                       rp->BitMap);
 126                         ivs->Width  = vs->Width;
 127                         ivs->Height = vs->Height;
 128                         ivs->Depth  = vs->Depth;
 129                 }
 130
 131                 ivs->OrigImageData = vs->ImageData;
 132
 133                 /*
 134                  * Blit the image data from the VSprite into the
 135                  * ImageData (BitMap) of the IntVSprite
 136                  */
 137                 InitBitMap(&x.bm,
 138                            ivs->Depth,
 139                            ivs->Width<<4,
 140                            ivs->Height);
 141
 142                 {
 143                     UBYTE *imagedata = (UBYTE *)vs->ImageData;
 144                     WORD  d, shift;
 145
 146                     for (d = 0, shift = 1; d < 8; d++, shift *= 2)
 147                     {
 148                         if (vs->PlanePick & shift)
 149                         {
 150                             x.bm.Planes[d] = imagedata;
 151                             imagedata += (x.bm.Rows * x.bm.BytesPerRow);
 152                         }
 153                         else
 154                         {
 155                             x.bm.Planes[d] = (vs->PlaneOnOff & shift) ? (PLANEPTR)-1 : NULL;
 156                         }
 157                     }
 158                 }
 159
 160                 BltBitMap(&x.bm,
 161                           0,
 162                           0,
 163                           ivs->ImageData,
 164                           0,
 165                           0,
 166                           ivs->Width << 4,
 167                           ivs->Height,
 168                           0x0c0,
 169                           vs->PlanePick,
 170                           NULL);
 171
 172         }
 173
 174         return TRUE;
 175 }
 176
 177 /*
 178  * Erase the VSprite from the list and follow the clear path
 179  * first, if necessary! This way of organizing the ClearPath
 180  * makes it easy to implement RemIBob but it leads to a recursion!
 181  * RemIBob could simply call this function here and then redraw
 182  * all cleared Bobs.
 183  * If a recursion is not what we want this can be easily
 184  * changed.
 185  */
 186
 187 void _ClearBobAndFollowClearPath(struct VSprite * CurVSprite,
 188                                  struct RastPort * rp,
 189                                  struct GfxBase * GfxBase)
 190 {
 191         /*
 192          * If the bob has not been drawn, yet, then don't do anything.
 193          * If the bob has already been cleared, then also leave here!
 194          * It does happen that this routine gets called for
 195          * a sprite that has been cleared already.
 196          */
 197         if (0 != (CurVSprite->VSBob->Flags & (BWAITING|BOBNIX))) {
 198                 CurVSprite->VSBob->Flags &= ~BWAITING;
 199                 return;
 200         }
 201
 202         if (NULL != CurVSprite->ClearPath) {
 203                 /*
 204                  * Clear the next one first. (recursion!!!)
 205                  */
 206                 _ClearBobAndFollowClearPath(CurVSprite->ClearPath,
 207                                             rp,
 208                                             GfxBase);
 209                 CurVSprite->ClearPath = NULL;
 210         }
 211
 212
 213         /*
 214          * Only restore the background if the bob image
 215          * that is currently there is to be replaced by
 216          * the background. If SAVEBOB is set the user
 217          * might want some kind of a brush effect.
 218          */
 219
 220         if (0 == (CurVSprite->Flags & SAVEBOB)) {
 221                 if (0 != (CurVSprite->Flags & BACKSAVED)) {
 222                         BltBitMapRastPort(CurVSprite->IntVSprite->SaveBuffer,
 223                                           0,
 224                                           0,
 225                                           rp,
 226                                           CurVSprite->OldX,
 227                                           CurVSprite->OldY,
 228                                           CurVSprite->Width << 4,
 229                                           CurVSprite->Height,
 230                                           0x0c0);
 231                         CurVSprite->Flags &= ~BACKSAVED;
 232
 233                 } /* if (0 != (CurVSprite->Flags & BACKSAVED)) */
 234                   else {
 235                         /*
 236                          * No background was saved. So let's restore the
 237                          * standard background!
 238                          */
 239                         EraseRect(rp,
 240                                   CurVSprite->OldX,
 241                                   CurVSprite->OldY,
 242                                   CurVSprite->OldX + ( CurVSprite->Width << 4 ) - 1,
 243                                   CurVSprite->OldY +   CurVSprite->Height       - 1);
 244                 }
 245                 /*
 246                  * Mark the BOB as cleared.
 247                  */
 248                 CurVSprite->VSBob->Flags |= BOBNIX;
 249         } /* if (0 == (CurVSprite->Flags & SAVEBOB)) */
 250 }