lib/modules/swfobject.c

   1 /* swfobject.c
   2
   3    Object place and move routines
   4
   5    Extension module for the rfxswf library.
   6    Part of the swftools package.
   7
   8    Copyright (c) 2001 Rainer Böhme <rfxswf@reflex-studio.de>
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
  23
  24 #define PF_MOVE         0x01
  25 #define PF_CHAR         0x02
  26 #define PF_MATRIX       0x04
  27 #define PF_CXFORM       0x08
  28 #define PF_RATIO        0x10
  29 #define PF_NAME         0x20
  30 #define PF_CLIPDEPTH    0x40
  31 #define PF_ACTIONEVENT  0x80
  32
  33 #define PF2_FILTERS      0x01
  34 #define PF2_BLENDMODE    0x02
  35 #define PF2_ASBITMAP     0x04
  36 //...
  37
  38 char*blendModeNames[] = {"normal","normal2","layer","multiply",
  39                        "screen","lighten", "darken","add",
  40                        "substract","difference","invert","alpha",
  41                        "erase","overlay","hardlight",0};
  42
  43 int isUnitMatrix(MATRIX* m)
  44 {
  45     /* a matrix with all zeros is also considered
  46        "unit matrix", as a zeroed out MATRIX structure
  47        usually means that the caller doesn't want to
  48        set the matrix */
  49     if((   (m->sx == 0x10000 && m->sy == 0x10000)
  50         || (m->sx == 0 && m->sy == 0))
  51                 && ((m->r0|m->r1|m->tx|m->ty) == 0)
  52       )
  53         return 1;
  54     return 0;
  55 }
  56
  57 int isUnitCXForm(CXFORM* cx)
  58 {
  59     if((cx->a0==256 && cx->r0==256 && cx->g0==256 && cx->b0==256) &&
  60        (cx->a1==0 && cx->r1==0 && cx->g1==0 && cx->b1==0))
  61         return 1;
  62     /* A CXForm of all zeros is, unfortunately, not as unlikely
  63        as a matrix of all zeros. However, we still treat it
  64        as non-existent/uniform transform */
  65     if((cx->a0==0 && cx->r0==0 && cx->g0==0 && cx->b0==0) &&
  66        (cx->a1==0 && cx->r1==0 && cx->g1==0 && cx->b1==0))
  67         return 1;
  68     return 0;
  69 }
  70
  71 static int objectplace(TAG * t,U16 id,U16 depth,MATRIX * m,CXFORM * cx,U8 * name, U16 clipaction, U8 blendmode, FILTERLIST*filters)
  72 { U8 flags,flags2;
  73   if (!t) return -1;
  74
  75   if(cx && id && cx->r1==0 && cx->g1==0 && cx->b1==0 && cx->a1==0
  76               && cx->r0==256 && cx->g0==256 && cx->b0==256 && cx->a0==256)
  77       cx = 0;
  78
  79   if(m && id && isUnitMatrix(m))
  80       m = 0;
  81
  82   flags = (id?PF_CHAR:0)|(m?PF_MATRIX:0)|(cx?PF_CXFORM:0)|(name?PF_NAME:0)|((m||cx)&&(!id)?PF_MOVE:0)|(clipaction?PF_CLIPDEPTH:0);
  83   flags2 = (0?PF2_ASBITMAP:0)|(blendmode?PF2_BLENDMODE:0)|(filters?PF2_FILTERS:0);
  84
  85   swf_SetU8(t,flags);
  86   if(t->id == ST_PLACEOBJECT3)
  87       swf_SetU8(t, flags2);
  88   swf_SetU16(t,depth);
  89   if (flags&PF_CHAR) swf_SetU16(t,id);
  90   if (flags&PF_MATRIX) swf_SetMatrix(t,m);
  91   if (flags&PF_CXFORM) swf_SetCXForm(t,cx,1);
  92   if (flags&PF_RATIO) swf_SetU16(t,0);
  93   /* ??? The spec states that name comes first? */
  94   if (flags&PF_CLIPDEPTH) swf_SetU16(t, clipaction);
  95   if (flags&PF_NAME) swf_SetString(t,name);
  96
  97   if (flags2&PF2_BLENDMODE)
  98     swf_SetU8(t,blendmode);
  99   return 0;
 100 }
 101 int swf_ObjectPlace(TAG * t,U16 id,U16 depth,MATRIX * m,CXFORM * cx,U8 * name)
 102 {
 103     return objectplace(t,id,depth,m,cx,name,0,0,0);
 104 }
 105 int swf_ObjectPlaceClip(TAG * t,U16 id,U16 depth,MATRIX * m,CXFORM * cx,U8 * name, U16 clipaction)
 106 {
 107     return objectplace(t,id,depth,m,cx,name,clipaction,0,0);
 108 }
 109 int swf_ObjectPlaceBlend(TAG * t,U16 id,U16 depth,MATRIX * m,CXFORM * cx,U8 * name, U8 blend)
 110 {
 111     if(t->id != ST_PLACEOBJECT3)
 112         fprintf(stderr, "wrong tag- ignoring blend mode\n");
 113     return objectplace(t,id,depth,m,cx,name,0,blend,0);
 114 }
 115 int swf_ObjectMove(TAG * t,U16 depth,MATRIX * m,CXFORM * cx)
 116 {
 117     return objectplace(t,0,depth,m,cx,0,0,0,0);
 118 }
 119
 120 void swf_SetPlaceObject(TAG * t,SWFPLACEOBJECT* obj)
 121 {
 122     if (!t) return ;
 123     if(t->id == ST_PLACEOBJECT) {
 124         swf_SetU16(t, obj->id);
 125         swf_SetU16(t, obj->depth);
 126         swf_SetMatrix(t, &obj->matrix);
 127         swf_SetCXForm(t, &obj->cxform, 0);
 128     } else {
 129         U8 flags,flags2;
 130         int m = !isUnitMatrix(&obj->matrix);
 131         int cx = !isUnitCXForm(&obj->cxform);
 132
 133         flags = (obj->id?PF_CHAR:0)|(m?PF_MATRIX:0)|(cx?PF_CXFORM:0)|(obj->ratio?PF_RATIO:0)|
 134                 (obj->name?PF_NAME:0)|(obj->move?PF_MOVE:0)|
 135                 (obj->clipdepth?PF_CLIPDEPTH:0);
 136         flags2 = (0?PF2_ASBITMAP:0)|(obj->blendmode?PF2_BLENDMODE:0)|(obj->filters?PF2_FILTERS:0);
 137
 138         swf_SetU8(t,flags);
 139         if(t->id == ST_PLACEOBJECT2)
 140             swf_SetU8(t,flags2);
 141         swf_SetU16(t,obj->depth);
 142         if (flags&PF_CHAR) swf_SetU16(t,obj->id);
 143         if (flags&PF_MATRIX) swf_SetMatrix(t,&obj->matrix);
 144         if (flags&PF_CXFORM) swf_SetCXForm(t,&obj->cxform,1);
 145         if (flags&PF_RATIO) swf_SetU16(t,obj->ratio);
 146
 147         /* ??? The spec states that name comes first? */
 148         if (flags&PF_CLIPDEPTH) swf_SetU16(t,obj->clipdepth);
 149         if (flags&PF_NAME) swf_SetString(t,obj->name);
 150
 151         if (flags2&PF2_FILTERS) {
 152             // ...
 153         }
 154         if (flags2&PF2_BLENDMODE)
 155             swf_SetU8(t,obj->blendmode);
 156         if (flags&PF_ACTIONEVENT) {
 157             // ...
 158         }
 159     }
 160 }
 161
 162 void swf_GetPlaceObject(TAG * tag,SWFPLACEOBJECT* obj)
 163 {
 164     if(!tag) {
 165         memset(obj, 0, sizeof(SWFPLACEOBJECT));
 166         swf_GetMatrix(0, &obj->matrix);
 167         swf_GetCXForm(0, &obj->cxform, 1);
 168         //obj->internal = PF_CHAR|PF_MATRIX|PF_CXFORM;
 169         return;
 170     }
 171     swf_SetTagPos(tag, 0);
 172
 173     if(tag->id == ST_PLACEOBJECT) {
 174         obj->id = swf_GetU16(tag);
 175         obj->depth = swf_GetU16(tag);
 176         swf_GetMatrix(tag, &obj->matrix);
 177         swf_GetCXForm(tag, &obj->cxform, 0);
 178         //obj->internal = PF_CHAR|PF_MATRIX|PF_CXFORM;
 179     } else if(tag->id == ST_PLACEOBJECT2 || tag->id == ST_PLACEOBJECT3) {
 180         U8 flags,flags2=0;
 181         flags = swf_GetU8(tag);
 182         if(tag->id == ST_PLACEOBJECT3)
 183             flags2 = swf_GetU8(tag);
 184         memset(obj,0,sizeof(SWFPLACEOBJECT));
 185
 186         swf_GetMatrix(0,&obj->matrix);
 187         swf_GetCXForm(0,&obj->cxform,1);
 188
 189         obj->depth = swf_GetU16(tag);
 190         //obj->internal = flags;
 191         if(flags&PF_MOVE) obj->move = 1;
 192         if(flags&PF_CHAR) obj->id = swf_GetU16(tag);
 193         if(flags&PF_MATRIX) swf_GetMatrix(tag, &obj->matrix);
 194         if(flags&PF_CXFORM) swf_GetCXForm(tag, &obj->cxform,1);
 195         if(flags&PF_RATIO) obj->ratio = swf_GetU16(tag);
 196         /* if you modify the order of these operations, also
 197            modify it in ../src/swfcombine.c */
 198         if(flags&PF_CLIPDEPTH)
 199             obj->clipdepth = swf_GetU16(tag); //clip
 200         if(flags&PF_NAME) {
 201             int l,t;
 202             U8*data;
 203             swf_ResetReadBits(tag);
 204             l = strlen(&tag->data[tag->pos]);
 205             t = 0;
 206             data = rfx_alloc(l+1);
 207             obj->name = data;
 208             while((data[t++] = swf_GetU8(tag)));
 209         }
 210         if(flags2&PF2_BLENDMODE) {
 211             obj->blendmode = swf_GetU8(tag);
 212         }
 213
 214         /* Actionscript ignored (for now) */
 215         obj->actions = 0;
 216     } else {
 217         fprintf(stderr, "rfxswf: Bad Tag: %d not a placeobject\n", tag->id);
 218     }
 219 }
 220
 221 void swf_PlaceObjectFree(SWFPLACEOBJECT* obj)
 222 {
 223     if(obj->name)
 224         rfx_free(obj->name);
 225 }
 226