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 #include "../rfxswf.h"
  25
  26
  27 char*blendModeNames[] = {"normal","normal2","layer","multiply",
  28                        "screen","lighten", "darken","add",
  29                        "substract","difference","invert","alpha",
  30                        "erase","overlay","hardlight",0};
  31
  32 int isUnitMatrix(MATRIX* m)
  33 {
  34     /* a matrix with all zeros is also considered
  35        "unit matrix", as a zeroed out MATRIX structure
  36        usually means that the caller doesn't want to
  37        set the matrix */
  38     if((   (m->sx == 0x10000 && m->sy == 0x10000)
  39         || (m->sx == 0 && m->sy == 0))
  40                 && ((m->r0|m->r1|m->tx|m->ty) == 0)
  41       )
  42         return 1;
  43     return 0;
  44 }
  45
  46 int isUnitCXForm(CXFORM* cx)
  47 {
  48     if((cx->a0==256 && cx->r0==256 && cx->g0==256 && cx->b0==256) &&
  49        (cx->a1==0 && cx->r1==0 && cx->g1==0 && cx->b1==0))
  50         return 1;
  51     /* A CXForm of all zeros is, unfortunately, not as unlikely
  52        as a matrix of all zeros. However, we still treat it
  53        as non-existent/uniform transform */
  54     if((cx->a0==0 && cx->r0==0 && cx->g0==0 && cx->b0==0) &&
  55        (cx->a1==0 && cx->r1==0 && cx->g1==0 && cx->b1==0))
  56         return 1;
  57     return 0;
  58 }
  59
  60 static int objectplace(TAG * t,U16 id,U16 depth,MATRIX * m,CXFORM * cx,const U8 * name, U16 clipaction, U8 blendmode, FILTERLIST*filters)
  61 { U8 flags,flags2;
  62   if (!t) return -1;
  63
  64   if(cx && id && cx->r1==0 && cx->g1==0 && cx->b1==0 && cx->a1==0
  65               && cx->r0==256 && cx->g0==256 && cx->b0==256 && cx->a0==256)
  66       cx = 0;
  67
  68   if(m && id && isUnitMatrix(m))
  69       m = 0;
  70
  71   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);
  72   flags2 = (0?PF2_ASBITMAP:0)|(blendmode?PF2_BLENDMODE:0)|(filters?PF2_FILTERS:0);
  73
  74   swf_SetU8(t,flags);
  75   if(t->id == ST_PLACEOBJECT3)
  76       swf_SetU8(t, flags2);
  77   swf_SetU16(t,depth);
  78   if (flags&PF_CHAR) swf_SetU16(t,id);
  79   if (flags&PF_MATRIX) swf_SetMatrix(t,m);
  80   if (flags&PF_CXFORM) swf_SetCXForm(t,cx,1);
  81   if (flags&PF_RATIO) swf_SetU16(t,0);
  82   /* ??? The spec states that name comes first? */
  83   if (flags&PF_CLIPDEPTH) swf_SetU16(t, clipaction);
  84   if (flags&PF_NAME) swf_SetString(t,name);
  85
  86   if (flags2&PF2_BLENDMODE)
  87     swf_SetU8(t,blendmode);
  88   return 0;
  89 }
  90 int swf_ObjectPlace(TAG * t,U16 id,U16 depth,MATRIX * m,CXFORM * cx,const U8 * name)
  91 {
  92     return objectplace(t,id,depth,m,cx,name,0,0,0);
  93 }
  94 int swf_ObjectPlaceClip(TAG * t,U16 id,U16 depth,MATRIX * m,CXFORM * cx,const U8 * name, U16 clipaction)
  95 {
  96     return objectplace(t,id,depth,m,cx,name,clipaction,0,0);
  97 }
  98 int swf_ObjectPlaceBlend(TAG * t,U16 id,U16 depth,MATRIX * m,CXFORM * cx,const U8 * name, U8 blend)
  99 {
 100     if(t->id != ST_PLACEOBJECT3)
 101         fprintf(stderr, "wrong tag- ignoring blend mode\n");
 102     return objectplace(t,id,depth,m,cx,name,0,blend,0);
 103 }
 104 int swf_ObjectMove(TAG * t,U16 depth,MATRIX * m,CXFORM * cx)
 105 {
 106     return objectplace(t,0,depth,m,cx,0,0,0,0);
 107 }
 108
 109 void swf_SetPlaceObject(TAG * t,SWFPLACEOBJECT* obj)
 110 {
 111     if (!t) return ;
 112     if(t->id == ST_PLACEOBJECT) {
 113         swf_SetU16(t, obj->id);
 114         swf_SetU16(t, obj->depth);
 115         swf_SetMatrix(t, &obj->matrix);
 116         swf_SetCXForm(t, &obj->cxform, 0);
 117     } else {
 118         U8 flags,flags2;
 119         int m = !isUnitMatrix(&obj->matrix);
 120         int cx = !isUnitCXForm(&obj->cxform);
 121
 122         flags = (obj->id?PF_CHAR:0)|(m?PF_MATRIX:0)|(cx?PF_CXFORM:0)|(obj->ratio?PF_RATIO:0)|
 123                 (obj->name?PF_NAME:0)|(obj->move?PF_MOVE:0)|
 124                 (obj->clipdepth?PF_CLIPDEPTH:0);
 125         flags2 = (0?PF2_ASBITMAP:0)|(obj->blendmode?PF2_BLENDMODE:0)|(obj->filters?PF2_FILTERS:0);
 126
 127         swf_SetU8(t,flags);
 128         if(t->id == ST_PLACEOBJECT3)
 129             swf_SetU8(t,flags2);
 130         swf_SetU16(t,obj->depth);
 131         if (flags&PF_CHAR) swf_SetU16(t,obj->id);
 132         if (flags&PF_MATRIX) swf_SetMatrix(t,&obj->matrix);
 133         if (flags&PF_CXFORM) swf_SetCXForm(t,&obj->cxform,1);
 134         if (flags&PF_RATIO) swf_SetU16(t,obj->ratio);
 135
 136         /* ??? The spec states that name comes first? */
 137         if (flags&PF_CLIPDEPTH) swf_SetU16(t,obj->clipdepth);
 138         if (flags&PF_NAME) swf_SetString(t,obj->name);
 139
 140         if (flags2&PF2_FILTERS) {
 141             swf_SetU8(t,obj->filters->num);
 142             int s;
 143             for(s=0;s<obj->filters->num;s++)
 144                 swf_SetFilter(t,obj->filters->filter[s]);
 145         }
 146         if (flags2&PF2_BLENDMODE)
 147             swf_SetU8(t,obj->blendmode);
 148         if (flags&PF_ACTIONEVENT) {
 149             // ...
 150         }
 151     }
 152 }
 153
 154 void swf_GetPlaceObject(TAG * tag,SWFPLACEOBJECT* obj)
 155 {
 156     if(!tag) {
 157         memset(obj, 0, sizeof(SWFPLACEOBJECT));
 158         swf_GetMatrix(0, &obj->matrix);
 159         swf_GetCXForm(0, &obj->cxform, 1);
 160         //obj->internal = PF_CHAR|PF_MATRIX|PF_CXFORM;
 161         return;
 162     }
 163     swf_SetTagPos(tag, 0);
 164
 165     if(tag->id == ST_PLACEOBJECT) {
 166         obj->id = swf_GetU16(tag);
 167         obj->depth = swf_GetU16(tag);
 168         swf_GetMatrix(tag, &obj->matrix);
 169         swf_GetCXForm(tag, &obj->cxform, 0);
 170         //obj->internal = PF_CHAR|PF_MATRIX|PF_CXFORM;
 171     } else if(tag->id == ST_PLACEOBJECT2 || tag->id == ST_PLACEOBJECT3) {
 172         U8 flags,flags2=0;
 173         flags = swf_GetU8(tag);
 174         if(tag->id == ST_PLACEOBJECT3)
 175             flags2 = swf_GetU8(tag);
 176         memset(obj,0,sizeof(SWFPLACEOBJECT));
 177
 178         swf_GetMatrix(0,&obj->matrix);
 179         swf_GetCXForm(0,&obj->cxform,1);
 180
 181         obj->depth = swf_GetU16(tag);
 182         //obj->internal = flags;
 183         if(flags&PF_MOVE) obj->move = 1;
 184         if(flags&PF_CHAR) obj->id = swf_GetU16(tag);
 185         if(flags&PF_MATRIX) swf_GetMatrix(tag, &obj->matrix);
 186         if(flags&PF_CXFORM) swf_GetCXForm(tag, &obj->cxform,1);
 187         if(flags&PF_RATIO) obj->ratio = swf_GetU16(tag);
 188         /* if you modify the order of these operations, also
 189            modify it in ../src/swfcombine.c */
 190         if(flags&PF_CLIPDEPTH)
 191             obj->clipdepth = swf_GetU16(tag); //clip
 192         if(flags&PF_NAME) {
 193             int l,t;
 194             U8*data;
 195             swf_ResetReadBits(tag);
 196             l = strlen((const char *)&tag->data[tag->pos]);
 197             t = 0;
 198             data = (U8*)rfx_alloc(l+1);
 199             obj->name = data;
 200             while((data[t++] = swf_GetU8(tag)));
 201         }
 202         if(flags2&PF2_BLENDMODE) {
 203             obj->blendmode = swf_GetU8(tag);
 204         }
 205
 206         /* Actionscript ignored (for now) */
 207         obj->actions = 0;
 208     } else {
 209         fprintf(stderr, "rfxswf: Bad Tag: %d not a placeobject\n", tag->id);
 210     }
 211 }
 212
 213 void swf_PlaceObjectFree(SWFPLACEOBJECT* obj)
 214 {
 215     if(obj->name)
 216         rfx_free(obj->name);
 217 }
 218