/* swftools.c

   Math and matrix functions, misc tools

   Extension module for the rfxswf library.
   Part of the swftools package.

   Copyright (c) 2000, 2001 Rainer Böhme <rfxswf@reflex-studio.de>
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

// Matrix & Math tools for SWF files

#define S64 long long
SFIXED RFXSWF_SP(SFIXED a1,SFIXED a2,SFIXED b1,SFIXED b2)
{ S64 a = ((S64)a1*(S64)b1+(S64)a2*(S64)b2)>>16;
  SFIXED result = (SFIXED)(a);
  if(a!=result) 
      fprintf(stderr, "Warning: overflow in matrix multiplication");
  return result;
}
SFIXED RFXSWF_QFIX(int zaehler,int nenner) // bildet Quotient von zwei INTs in SFIXED
{ S64 z = zaehler<<16;
  S64 a = z/(S64)nenner;
  return (SFIXED)a;
}
#undef S64

MATRIX * swf_MatrixJoin(MATRIX * d,MATRIX * s1,MATRIX * s2)
{        
  if (!d) return NULL;
  if (!s1) return (s2)?(MATRIX *)memcpy(d,s2,sizeof(MATRIX)):NULL;
  if (!s2) return (MATRIX *)memcpy(d,s1,sizeof(MATRIX));
  
  d->tx = s1->tx + RFXSWF_SP(s1->sx,s1->r1,s2->tx,s2->ty);
  d->ty = s1->ty + RFXSWF_SP(s1->r0,s1->sy,s2->tx,s2->ty);
  
  d->sx = RFXSWF_SP(s1->sx,s1->r1,s2->sx,s2->r0);
  d->r0 = RFXSWF_SP(s1->r0,s1->sy,s2->sx,s2->r0);

  d->r1 = RFXSWF_SP(s1->sx,s1->r1,s2->r1,s2->sy);
  d->sy = RFXSWF_SP(s1->r0,s1->sy,s2->r1,s2->sy);

  //DumpMatrix(NULL,d);
  
  return d;
}

MATRIX * swf_MatrixMapTriangle(MATRIX * m,int dx,int dy,int x0,int y0,
                               int x1,int y1,int x2,int y2)
{ int dx1 = x1 - x0;
  int dy1 = y1 - y0;
  int dx2 = x2 - x0;
  int dy2 = y2 - y0;
  
  if (!m) return NULL;
  if ((!dx)||(!dy)) return NULL; // check DIV by zero

  m->tx = x0;
  m->ty = y0;
  m->sx = RFXSWF_QFIX(dx1,dx);
  m->sy = RFXSWF_QFIX(dy2,dy);
  m->r0 = RFXSWF_QFIX(dy1,dx);
  m->r1 = RFXSWF_QFIX(dx2,dy);
  
  return m;
}

void swf_SetDefineID(TAG * tag, U16 newid)
{
  int oldlen = tag->len;
  tag->len = 0;
  swf_SetU16(tag, newid); /* set defining ID */
  tag->len = oldlen;
}

U16 swf_GetDefineID(TAG * t)
// up to SWF 4.0
{ U32 oldTagPos;
  U16 id = 0;

  oldTagPos = swf_GetTagPos(t);
  swf_SetTagPos(t,0);

  switch (swf_GetTagID(t))
  { case ST_DEFINESHAPE:
    case ST_DEFINESHAPE2:
    case ST_DEFINESHAPE3:
    case ST_DEFINESHAPE4:
    case ST_DEFINEMORPHSHAPE:
    case ST_DEFINEEDITTEXT:
    case ST_DEFINEBITS:
    case ST_DEFINEBITSJPEG2:
    case ST_DEFINEBITSJPEG3:
    case ST_DEFINEBITSLOSSLESS:
    case ST_DEFINEBITSLOSSLESS2:
    case ST_DEFINESCALINGGRID: //pseudodefine
    case ST_DEFINEBUTTON:
    case ST_DEFINEBUTTON2:
    case ST_DEFINEBUTTONCXFORM: //pseudodefine
    case ST_DEFINEBUTTONSOUND: //pseudodefine
    case ST_CSMTEXTSETTINGS: //pseudodefine
    case ST_DEFINEFONT:
    case ST_DEFINEFONT2:
    case ST_DEFINEFONT3:
    case ST_DEFINEFONTINFO: //pseudodefine
    case ST_DEFINEFONTINFO2: //pseudodefine
    case ST_DEFINEFONTALIGNZONES: //pseudodefine
    case ST_DEFINETEXT:
    case ST_DEFINETEXT2:
    case ST_DEFINESOUND:
    case ST_DEFINESPRITE:
    case ST_DEFINEMOVIE:
    case ST_DEFINEVIDEOSTREAM:
    case ST_GLYPHNAMES: //pseudodefine
    case ST_VIDEOFRAME: //pseudodefine
    case ST_NAMECHARACTER: //pseudodefine
    case ST_DOINITACTION: //pseudodefine
      id = swf_GetU16(t);
      break;
    default:
      fprintf(stderr, "rfxswf: Error: tag %d (%s) has no id\n", t->id, swf_TagGetName(t));
  }

  swf_SetTagPos(t,oldTagPos);

  return id;
}

SRECT swf_GetDefineBBox(TAG * t)
{
  U32 oldTagPos;
  U16 id = 0;
  SRECT b1,b2;
  memset(&b1, 0, sizeof(b1));

  oldTagPos = swf_GetTagPos(t);
  swf_SetTagPos(t,0);

  swf_GetRect(0, &b1);

  switch (swf_GetTagID(t))
  { case ST_DEFINESHAPE:
    case ST_DEFINESHAPE2:
    case ST_DEFINESHAPE3:
    case ST_DEFINEEDITTEXT:
    case ST_DEFINETEXT:
    case ST_DEFINETEXT2:
    case ST_DEFINEVIDEOSTREAM:
      id = swf_GetU16(t);
      swf_GetRect(t, &b1);
      break;
    case ST_DEFINEMORPHSHAPE:
      id = swf_GetU16(t);
      swf_GetRect(t, &b1);
      swf_GetRect(t, &b2);
      swf_ExpandRect2(&b1, &b2);
      break;
    case ST_DEFINEBITSLOSSLESS:
    case ST_DEFINEBITSLOSSLESS2:
    case ST_DEFINEBITS:
    case ST_DEFINEBITSJPEG2:
    case ST_DEFINEBITSJPEG3:
      // FIXME
      break;
  }

  swf_SetTagPos(t,oldTagPos);

  return b1;
}

U16 swf_GetPlaceID(TAG * t)
// up to SWF 4.0
{ U32 oldTagPos;
  U16 id = 0;

  oldTagPos = swf_GetTagPos(t);
  swf_SetTagPos(t,0);

  switch (swf_GetTagID(t))
  { case ST_PLACEOBJECT:
    case ST_REMOVEOBJECT:
    case ST_FREECHARACTER:
    case ST_STARTSOUND:
      id = swf_GetU16(t);
      break;

    case ST_PLACEOBJECT2:
    { U8 flags = swf_GetU8(t);
      U16 d = swf_GetU16(t);
      id = (flags&PF_CHAR)?swf_GetU16(t):id;
    } break;
    case ST_PLACEOBJECT3:
    { U8 flags = swf_GetU8(t);
      U8 flags2 = swf_GetU8(t);
      U16 d = swf_GetU16(t);
      id = (flags&PF_CHAR)?swf_GetU16(t):id;
    } break;

  }

  swf_SetTagPos(t,oldTagPos);

  return id;
}

static int swf_definingtagids[] =
{ST_DEFINESHAPE,
 ST_DEFINESHAPE2,
 ST_DEFINESHAPE3,
 ST_DEFINESHAPE4,
 ST_DEFINEMORPHSHAPE,
 ST_DEFINEFONT,
 ST_DEFINEFONT2,
 ST_DEFINEFONT3,
 ST_DEFINETEXT,
 ST_DEFINETEXT2,
 ST_DEFINEEDITTEXT,
 ST_DEFINEBITS,
 ST_DEFINEBITSJPEG2,
 ST_DEFINEBITSJPEG3,
 ST_DEFINEBITSLOSSLESS,
 ST_DEFINEBITSLOSSLESS2,
 ST_DEFINEMOVIE,
 ST_DEFINESPRITE,
 ST_DEFINEBUTTON,
 ST_DEFINEBUTTON2,
 ST_DEFINESOUND,
 ST_DEFINEVIDEOSTREAM,
 -1
};

// tags which may be used inside a sprite definition
static int swf_spritetagids[] =
{ST_SHOWFRAME,
 ST_PLACEOBJECT,
 ST_PLACEOBJECT2,
 ST_PLACEOBJECT3,
 ST_REMOVEOBJECT,
 ST_REMOVEOBJECT2,
 ST_DOACTION,
 ST_STARTSOUND,
 ST_FRAMELABEL,
 ST_SOUNDSTREAMHEAD,
 ST_SOUNDSTREAMHEAD2,
 ST_SOUNDSTREAMBLOCK,
 ST_END,
 -1
};

/* tags which add content or information to a character with a given ID */
static int swf_pseudodefiningtagids[] = 
{
 ST_DEFINEFONTINFO,
 ST_DEFINEFONTINFO2,
 ST_DEFINEFONTALIGNZONES,
 ST_DEFINEBUTTONCXFORM,
 ST_DEFINEBUTTONSOUND,
 ST_DEFINESCALINGGRID,
 ST_CSMTEXTSETTINGS,
 ST_NAMECHARACTER,
 ST_DOINITACTION,
 ST_VIDEOFRAME,
 ST_GLYPHNAMES,
 -1
};

U8 swf_isAllowedSpriteTag(TAG * tag)
{
    int id = tag->id;
    int t=0;
    while(swf_spritetagids[t]>=0)
    {
        if(swf_spritetagids[t] == id) 
            return 1;
        t++;
    }
    return 0; 
}

U8 swf_isDefiningTag(TAG * tag)
{
    int id = tag->id;
    int t=0;
    while(swf_definingtagids[t]>=0)
    {
        if(swf_definingtagids[t] == id) 
            return 1;
        t++;
    }
    return 0; 
}

U8 swf_isPseudoDefiningTag(TAG * tag)
{
    int id = tag->id;
    int t=0;
    while(swf_pseudodefiningtagids[t]>=0)
    {
        if(swf_pseudodefiningtagids[t] == id) 
            return 1;
        t++;
    }
    return 0; 
}

int swf_GetDepth(TAG * t)
{ 
  int depth = -1;
  U32 oldTagPos;
  oldTagPos = swf_GetTagPos(t);
  swf_SetTagPos(t,0);

  switch (swf_GetTagID(t))
  { case ST_PLACEOBJECT:
    case ST_REMOVEOBJECT:
      swf_GetU16(t); //id
      depth = swf_GetU16(t);
      break;
    case ST_REMOVEOBJECT2:
      depth = swf_GetU16(t);
      break;
    case ST_PLACEOBJECT2:
    { U8 flags = swf_GetU8(t);
      depth = swf_GetU16(t);
    } break;
    case ST_PLACEOBJECT3:
    { U8 flags = swf_GetU8(t);
      U8 flags2 = swf_GetU8(t);
      depth = swf_GetU16(t);
    } break;
    case ST_SETTABINDEX:
    {
      depth = swf_GetU16(t);
    }
  }
  swf_SetTagPos(t,oldTagPos);
  return depth;
}

void swf_SetDepth(TAG * t, U16 depth)
{ 
  switch (swf_GetTagID(t))
  { case ST_PLACEOBJECT:
    case ST_REMOVEOBJECT:
      PUT16(t->data, depth);
      break;
    case ST_REMOVEOBJECT2:
      PUT16(t->data, depth);
      break;
    case ST_PLACEOBJECT2:
      PUT16(&t->data[1], depth);
      break;
    case ST_SETTABINDEX:
      PUT16(t->data, depth);
      break;
    default:
      fprintf(stderr, "rfxswf: Error: tag %d has no depth\n", t->id);
  }
}

char* swf_GetName(TAG * t)
{
    char* name = 0;
    U32 oldTagPos;
    MATRIX m;
    CXFORM c;
    oldTagPos = swf_GetTagPos(t);
    swf_SetTagPos(t,0);
    switch(swf_GetTagID(t))
    {
        case ST_FRAMELABEL:
            name = &t->data[swf_GetTagPos(t)];
        break;
        case ST_PLACEOBJECT3:
        case ST_PLACEOBJECT2: {   
            U8 flags = swf_GetU8(t);
	    if(t->id == ST_PLACEOBJECT3)
		swf_GetU8(t);
            swf_GetU16(t); //depth;
            if(flags&PF_CHAR) 
              swf_GetU16(t); //id
            if(flags&PF_MATRIX)
              swf_GetMatrix(t, &m);
            if(flags&PF_CXFORM)
              swf_GetCXForm(t, &c, 1);
            if(flags&PF_RATIO)
              swf_GetU16(t);
            if(flags&PF_CLIPDEPTH)
              swf_GetU16(t);
            if(flags&PF_NAME) {
              swf_ResetReadBits(t);
              name = &t->data[swf_GetTagPos(t)];
            }
        }
        break;
    }
    swf_SetTagPos(t,oldTagPos);
    return name;
}

/* used in enumerateUsedIDs */
void swf_GetMorphGradient(TAG * tag, GRADIENT * gradient1, GRADIENT * gradient2)
{
    int t;
    int num = swf_GetU8(tag) & 15;
    if(gradient1) gradient1->num = num;
    if(gradient2) gradient2->num = num;
    
    if(gradient1) {
	gradient1->num = num;
	gradient1->rgba = rfx_calloc(sizeof(RGBA)*gradient1->num);
	gradient1->ratios = rfx_calloc(sizeof(gradient1->ratios[0])*gradient1->num);
    }
    if(gradient2) {
	gradient2->num = num;
	gradient2->rgba = rfx_calloc(sizeof(RGBA)*gradient2->num);
	gradient2->ratios = rfx_calloc(sizeof(gradient2->ratios[0])*gradient2->num);
    }
    for(t=0;t<num;t++)
    {
	U8 ratio;
	RGBA color;
	
	ratio = swf_GetU8(tag);
	swf_GetRGBA(tag, &color);
	if(gradient1) {
	    gradient1->ratios[t] = ratio;
	    gradient1->rgba[t] = color;
	}

	ratio = swf_GetU8(tag);
	swf_GetRGBA(tag, &color);
	if(gradient2) {
	    gradient2->ratios[t] = ratio;
	    gradient2->rgba[t] = color;
	}
    }
}

#define DEBUG_ENUMERATE if(0)
//#define DEBUG_ENUMERATE

void enumerateUsedIDs_styles(TAG * tag, void (*callback)(TAG*, int, void*), void*callback_data, int num, int morph)
{
    U16 count;
    int t;
    count = swf_GetU8(tag);
    if(count == 0xff && num>1) // defineshape2,3,4 only
	count = swf_GetU16(tag);

    DEBUG_ENUMERATE printf("%d fill styles\n", count);
    for(t=0;t<count;t++)
    {
	int type;
	U8*pos;
	type = swf_GetU8(tag); //type
	DEBUG_ENUMERATE printf("fill style %d) %02x (tagpos=%d)\n", t, type, tag->pos);
	if(type == 0) {
	    if(num >= 3)
		{swf_GetRGBA(tag, NULL);if(morph) swf_GetRGBA(tag, NULL);}
	    else 
		{swf_GetRGB(tag, NULL);if(morph) swf_GetRGB(tag, NULL);}
	}
	else if(type == 0x10 || type == 0x12 || type == 0x13)
	{
	    swf_ResetReadBits(tag);
	    MATRIX m;
	    swf_GetMatrix(tag, &m);
	    DEBUG_ENUMERATE swf_DumpMatrix(stdout, &m);
	    if(morph)
		swf_GetMatrix(tag, NULL);
	    swf_ResetReadBits(tag);
	    if(morph)
		swf_GetMorphGradient(tag, NULL, NULL);
	    else {
		GRADIENT g;
		swf_GetGradient(tag, &g, /*alpha*/ num>=3?1:0);
		DEBUG_ENUMERATE swf_DumpGradient(stdout, &g);
		if(type == 0x13)
		    swf_GetU16(tag);
	    }
	}
	else if(type == 0x40 || type == 0x41 || type == 0x42 || type == 0x43)
	{
	    swf_ResetReadBits(tag);
	    if(tag->data[tag->pos] != 0xff ||
	       tag->data[tag->pos+1] != 0xff)
	    (callback)(tag, tag->pos, callback_data);

	    swf_GetU16(tag);
	    swf_ResetReadBits(tag);
	    swf_GetMatrix(tag, NULL);
	    if(morph)
		swf_GetMatrix(tag, NULL);
	}
	else {
	    fprintf(stderr, "rfxswf:swftools.c Unknown fillstyle:0x%02x in tag %02x\n",type, tag->id);
	}
    }
    swf_ResetReadBits(tag);
    count = swf_GetU8(tag); // line style array
    if(count == 0xff)
	count = swf_GetU16(tag);
    DEBUG_ENUMERATE printf("%d line styles\n", count);
    for(t=0;t<count;t++) 
    {
	U16  width;
	RGBA color;
	width = swf_GetU16(tag);
	if(morph)
	    swf_GetU16(tag);
	if(num >= 4) {
	    U16 flags = swf_GetU16(tag);
	    if(flags & 0x2000)
		swf_GetU16(tag); // miter limit
	    if(flags & 0x0800) {
		fprintf(stderr, "Filled strokes parsing not yet supported\n");
	    }
	}
	if(num >= 3)
	    {swf_GetRGBA(tag, &color);if(morph) swf_GetRGBA(tag, NULL);}
	else
	    {swf_GetRGB(tag, &color);if(morph) swf_GetRGB(tag, NULL);}
	DEBUG_ENUMERATE printf("line style %d: %02x%02x%02x%02x \n", t, color.r,color.g,color.b,color.a);
    }
}

void enumerateUsedIDs(TAG * tag, int base, void (*callback)(TAG*, int, void*), void*callback_data)
{
    int num = 1;
    swf_ResetReadBits(tag);
    tag->pos = 0;
    switch(tag->id)
    {
	case ST_DEFINEBUTTONSOUND: {
	    int t;
	    callback(tag, tag->pos + base, callback_data);
	    for(t=0;t<4;t++) {
		int flags;
		callback(tag, tag->pos + base, callback_data);
		swf_GetU16(tag); //sound id
		flags = swf_GetU8(tag);
		if(flags&1)
		    swf_GetU32(tag); // in point
		if(flags&2)
		    swf_GetU32(tag); // out points
		if(flags&4)
		    swf_GetU16(tag); // loop count
		if(flags&8)
		{
		    int npoints = swf_GetU8(tag);
		    int s;
		    for(s=0;s<npoints;s++)
		    {
			swf_GetU32(tag);
			swf_GetU16(tag);
			swf_GetU16(tag);
		    }
		}
	    }
        } break;
	case ST_DEFINEBUTTONCXFORM:
	    callback(tag, tag->pos + base, callback_data); //button id
	break;

	case ST_EXPORTASSETS: {
	    int num =  swf_GetU16(tag);
	    int t;
	    for(t=0;t<num;t++) {
		callback(tag, tag->pos + base, callback_data); //button id
		swf_GetU16(tag); //id
		while(swf_GetU8(tag)); //name
	    }
	} break;

	case ST_IMPORTASSETS: 
	case ST_IMPORTASSETS2: {
	    swf_GetString(tag); //count
	    swf_GetU8(tag); //reserved
	    swf_GetU8(tag); //reserved
	    int num =  swf_GetU16(tag); //url
	    int t;
	    for(t=0;t<num;t++) {
		callback(tag, tag->pos + base, callback_data); //button id
		swf_GetU16(tag); //id
		while(swf_GetU8(tag)); //name
	    }
	} break;

	case ST_FREECHARACTER: /* unusual tags, which all start with an ID */
	case ST_NAMECHARACTER:
	case ST_GENERATORTEXT:
	    callback(tag, tag->pos + base, callback_data);
        break;
	case ST_PLACEOBJECT:
	    callback(tag, tag->pos + base, callback_data);
        break;
	case ST_PLACEOBJECT2:
	    // only if placeflaghascharacter
	    if(!(tag->data[0]&2))
		break;
	    callback(tag, 3 + base, callback_data);
        break;
	case ST_PLACEOBJECT3:
	    // only if placeflaghascharacter
	    if(!(tag->data[0]&2))
		break;
	    callback(tag, 4 + base, callback_data);
        break;
	case ST_REMOVEOBJECT:
	    callback(tag, tag->pos + base, callback_data);
	break;
	case ST_STARTSOUND:
	    callback(tag, tag->pos + base, callback_data);
	break;
	case ST_DEFINESPRITE: {
	    if(tag->len <= 4)
		break; // sprite is expanded

	    swf_GetU16(tag); // id
	    swf_GetU16(tag); // framenum

	    while(1) {
		U16 flags = swf_GetU16(tag);
		U32 len;
		U16 id = flags>>6;
		TAG *tag2 = swf_InsertTag(NULL, id);
		len = flags&0x3f;
		if(len == 63)
		    len = swf_GetU32(tag);
		if(id == ST_END)
		    break;
		tag2->len = tag2->memsize = len;
		tag2->data = rfx_alloc(len);
		memcpy(tag2->data, &tag->data[tag->pos], len);
		/* I never saw recursive sprites, but they are (theoretically) 
		   possible, so better add base here again */
		enumerateUsedIDs(tag2, tag->pos + base, callback, callback_data);
		swf_DeleteTag(tag2);
		swf_GetBlock(tag, NULL, len);
	    }
	} 
	break;
	case ST_DEFINEBUTTON2: // has some font ids in the button records
	    num++; 
	//fallthrough
	case ST_DEFINEBUTTON: {
	    swf_GetU16(tag); //button id
	    if(num>1)
	    { 
		int offset;
		swf_GetU8(tag); //flag
		offset = swf_GetU16(tag); //offset
	    }
	    while(1)
	    {
		U16 charid;
		if(!swf_GetU8(tag)) //flags
		    break; 
		callback(tag, tag->pos + base, callback_data);
		swf_GetU16(tag); //char
		swf_GetU16(tag); //layer
		swf_ResetReadBits(tag);
		swf_GetMatrix(tag, NULL);
		if(num>1) {
		  swf_ResetReadBits(tag);
		  swf_GetCXForm(tag, NULL, 1);
		}
	    }
	    // ...
	}
	break;
	case ST_DEFINEEDITTEXT:  {
	    U8 flags1,flags2;
	    swf_GetU16(tag); //id
	    swf_GetRect(tag, NULL); //bounding box
	    swf_ResetReadBits(tag);
	    flags1 = swf_GetU8(tag);
	    flags2 = swf_GetU8(tag);
	    if(flags1 & 1)
		callback(tag, tag->pos + base, callback_data);
	}
	break;
	case ST_DEFINETEXT2:
	    num ++;
	case ST_DEFINETEXT: { 
	    int glyphbits, advancebits;
	    int id;
	    id = swf_GetU16(tag); //id
	    swf_GetRect(tag, NULL); //bounding box
	    swf_ResetReadBits(tag);
	    swf_GetMatrix(tag, NULL); //matrix
	    swf_ResetReadBits(tag);
	    glyphbits = swf_GetU8(tag); //glyphbits
	    advancebits = swf_GetU8(tag); //advancebits
	    while(1) {
		U16 flags;
		int t;
		swf_ResetReadBits(tag);
		flags = swf_GetBits(tag, 8);
		if(!flags) break;
		
		swf_ResetReadBits(tag);
		if(flags & 8) { // hasfont
		    callback(tag, tag->pos + base, callback_data);
		    id = swf_GetU16(tag);
		}
		if(flags & 4) { // hascolor
		    if(num==1) swf_GetRGB(tag, NULL);
		    else       swf_GetRGBA(tag, NULL);
		}
		if(flags & 2) { //has x offset
		    swf_ResetReadBits(tag);
		    swf_GetU16(tag);
		}
		if(flags & 1) { //has y offset
		    swf_ResetReadBits(tag);
		    swf_GetU16(tag);
		}
		if(flags & 8) { //has height
		    swf_ResetReadBits(tag);
		    swf_GetU16(tag);
		}
		
		flags = swf_GetBits(tag, 8);
		if(!flags) break;
		swf_ResetReadBits(tag);
		for(t=0;t<flags;t++) {
		    swf_GetBits(tag, glyphbits);
		    swf_GetBits(tag, advancebits);
		}
	    }
	    break;
	}
	case ST_DEFINEFONTALIGNZONES:
	case ST_DEFINESCALINGGRID:
	case ST_GLYPHNAMES:
	case ST_CSMTEXTSETTINGS:
	case ST_DEFINEFONTINFO:
	case ST_DEFINEFONTINFO2:
	case ST_VIDEOFRAME:
	    callback(tag, tag->pos + base, callback_data);
	break;
	case ST_DEFINEVIDEOSTREAM:
	break;

	case ST_DOINITACTION:
	    callback(tag, tag->pos + base, callback_data);
	break;

	case ST_DEFINEMORPHSHAPE2:
	case ST_DEFINESHAPE4:
	num++;
	case ST_DEFINEMORPHSHAPE:
	case ST_DEFINESHAPE3:
	num++; //fallthrough
	case ST_DEFINESHAPE2:
	num++; //fallthrough
	case ST_DEFINESHAPE: {
	    int fillbits;
	    int linebits;
	    int id; 
	    int numshapes = 1;
	    int morph = 0;
	    if(tag->id == ST_DEFINEMORPHSHAPE || tag->id==ST_DEFINEMORPHSHAPE2) {
		numshapes = 2;
		morph = 1;
	    }

	    id = swf_GetU16(tag); // id;
	    SRECT r={0,0,0,0},r2={0,0,0,0};
	    swf_GetRect(tag, &r); // shape bounds
	    if(morph) {
		swf_ResetReadBits(tag);
		swf_GetRect(tag, NULL); // shape bounds2
		if(num>=4) {
		    swf_ResetReadBits(tag);
		    swf_GetRect(tag, NULL); // edge bounds1
		}
	    }
	    if(num>=4) {
		swf_ResetReadBits(tag);
		swf_GetRect(tag, &r2); // edge bounds
		U8 flags = swf_GetU8(tag); // flags, &1: contains scaling stroke, &2: contains non-scaling stroke
		DEBUG_ENUMERATE printf("flags: %02x (1=scaling strokes, 2=non-scaling strokes)\n", flags);
	    }
	    if(morph) {
		swf_GetU32(tag); //offset to endedges
	    }
   
	    DEBUG_ENUMERATE printf("Tag:%d Name:%s ID:%d\n", tag->id, swf_TagGetName(tag), id);
	    DEBUG_ENUMERATE printf("BBox %.2f %.2f %.2f %.2f\n", r.xmin/20.0,r.ymin/20.0,r.xmax/20.0,r.ymax/20.0);
	    DEBUG_ENUMERATE printf("BBox %.2f %.2f %.2f %.2f\n", r2.xmin/20.0,r2.ymin/20.0,r2.xmax/20.0,r2.ymax/20.0);

	    DEBUG_ENUMERATE printf("style tag pos: %d\n", tag->pos);
	    enumerateUsedIDs_styles(tag, callback, callback_data, num, morph);
	    DEBUG_ENUMERATE printf("-------\n");
	    swf_ResetReadBits(tag);
	    while(--numshapes>=0) /* morph shapes define two shapes */
	    {
		DEBUG_ENUMERATE printf("shape:%d\n", numshapes);
		fillbits = swf_GetBits(tag, 4);
		linebits = swf_GetBits(tag, 4);
		DEBUG_ENUMERATE printf("fillbits=%d linebits=%d\n", fillbits, linebits);
		swf_ResetReadBits(tag);
		while(1) {
		    int flags;
		    flags = swf_GetBits(tag, 1);
		    if(!flags) { //style change
			flags = swf_GetBits(tag, 5);
			if(!flags)
			    break;
			if(flags&1) { //move
			    int n = swf_GetBits(tag, 5); 
			    int x,y;
			    x = swf_GetBits(tag, n); //x
			    y = swf_GetBits(tag, n); //y
			    DEBUG_ENUMERATE printf("move %f %f\n",x/20.0,y/20.0);
			}
			if(flags&2) { //fill0
			    int fill0;
			    fill0 = swf_GetBits(tag, fillbits); 
			    DEBUG_ENUMERATE printf("fill0 %d\n", fill0);
			}
			if(flags&4) { //fill1
			    int fill1;
			    fill1 = swf_GetBits(tag, fillbits); 
			    DEBUG_ENUMERATE printf("fill1 %d\n", fill1);
			}
			if(flags&8) { //linestyle
			    int line;
			    line = swf_GetBits(tag, linebits); 
			    DEBUG_ENUMERATE printf("linestyle %d\n",line);
			}
			if(flags&16) {
			    DEBUG_ENUMERATE printf("more fillstyles\n");
			    enumerateUsedIDs_styles(tag, callback, callback_data, num, 0);
			    fillbits = swf_GetBits(tag, 4);
			    linebits = swf_GetBits(tag, 4);
			}
		    } else {
			flags = swf_GetBits(tag, 1);
			if(flags) { //straight edge
			    int n = swf_GetBits(tag, 4) + 2;
			    if(swf_GetBits(tag, 1)) { //line flag
				int x,y;
				x = swf_GetSBits(tag, n); //delta x
				y = swf_GetSBits(tag, n); //delta y
				DEBUG_ENUMERATE printf("line %f %f\n",x/20.0,y/20.0);
			    } else {
				int v=swf_GetBits(tag, 1);
				int d;
				d = swf_GetSBits(tag, n); //vert/horz
				DEBUG_ENUMERATE printf("%s %f\n",v?"vertical":"horizontal", d/20.0);
			    }
			} else { //curved edge
			    int n = swf_GetBits(tag, 4) + 2;
			    int x1,y1,x2,y2;
			    x1 = swf_GetSBits(tag, n);
			    y1 = swf_GetSBits(tag, n);
			    x2 = swf_GetSBits(tag, n);
			    y2 = swf_GetSBits(tag, n);
			    DEBUG_ENUMERATE printf("curve %f %f %f %f\n", x1/20.0, y1/20.0, x2/20.0, y2/20.0);
			}
		    }
		}
	    }
	}
	break;
	default:
	break;
    }
}

void callbackCount(TAG * t,int pos, void*ptr)
{
    (*(int*)ptr)++;
    DEBUG_ENUMERATE printf("callback(%d) %d\n", pos, *(U16*)&t->data[pos]);
}

void callbackFillin(TAG * t,int pos, void*ptr)
{
    **(int**)ptr = pos;
    (*(int**)ptr)++;
    DEBUG_ENUMERATE printf("callback(%d) %d\n", pos, *(U16*)&t->data[pos]);
}

int swf_GetNumUsedIDs(TAG * t)
{
    int num = 0;
    enumerateUsedIDs(t, 0, callbackCount, &num);
    return num;
}

void swf_GetUsedIDs(TAG * t, int * positions)
{
    int * ptr = positions;
    enumerateUsedIDs(t, 0, callbackFillin, &ptr);
}

void swf_Relocate (SWF*swf, char*bitmap)
{
    TAG*tag;
    int slaveids[65536];
    memset(slaveids, -1, sizeof(slaveids));
    tag = swf->firstTag;
    while(tag)
    {
	int num; 
	int *ptr;
	int t;

	if(swf_isDefiningTag(tag))
	{
	    int newid;
	    int id;
	    
	    id = swf_GetDefineID(tag); //own id

	    if(!bitmap[id]) { //free
		newid = id;
	    }
	    else {
		newid = 0;
		for (t=1;t<65536;t++)
		{
		    if(!bitmap[t])
		    {
			newid = t;
			break;
		    }
		}
	    }
	    bitmap[newid] = 1;
	    slaveids[id] = newid;

	    swf_SetDefineID(tag, newid);
	} 
	
	num = swf_GetNumUsedIDs(tag);
	if(num) {
	    ptr = rfx_alloc(sizeof(int)*num);
	    swf_GetUsedIDs(tag, ptr);

	    for(t=0;t<num;t++) {
		int id = GET16(&tag->data[ptr[t]]);
		if(slaveids[id]<0) {
		    fprintf(stderr, "swf_Relocate: Mapping id (%d) never encountered before in %s\n", id,
			    swf_TagGetName(tag));
		    return ;
		}
		id = slaveids[id];
		PUT16(&tag->data[ptr[t]], id);
	    }
	}
	tag=tag->next;
    }
}

/* untested */
void swf_Relocate2(SWF*swf, int*id2id)
{
    TAG*tag;
    tag = swf->firstTag;
    while(tag) {
	if(swf_isDefiningTag(tag)) {
	    int id = swf_GetDefineID(tag);
	    id = id2id[id];
	    if(id>=0) {
		swf_SetDefineID(tag, id);
	    }
	}
	int num = swf_GetNumUsedIDs(tag);
	if(num) {
	    int *ptr;
	    int t;
	    ptr = rfx_alloc(sizeof(int)*num);
	    swf_GetUsedIDs(tag, ptr);
	    for(t=0;t<num;t++) {
		int id = GET16(&tag->data[ptr[t]]);
		id = id2id[id];
		if(id>=0) {
		    PUT16(&tag->data[ptr[t]], id);
		}
	    }
	}
    }
}

void swf_RelocateDepth(SWF*swf, char*bitmap)
{
    TAG*tag;
    int nr;
    tag = swf->firstTag;
    for(nr=65535;nr>=0;nr--) {
	if(bitmap[nr] != 0) 
	    break;
    }
    // now nr is the highest used depth. So we start
    // assigning depths at nr+1
    nr++;

    while(tag)
    {
	int depth;
	/* TODO * clip depths 
	        * sprites
	 */
	if(tag->id == ST_PLACEOBJECT2) {
	    SWFPLACEOBJECT obj;
	    swf_GetPlaceObject(tag, &obj);
	    if(obj.clipdepth) {
		int newdepth = obj.clipdepth+nr;
		if(newdepth>65535) {
		    fprintf(stderr, "Couldn't relocate depths: too large values\n");
		    newdepth = 65535;
		}
		obj.clipdepth = newdepth;
		swf_ResetTag(tag, ST_PLACEOBJECT2);
		swf_SetPlaceObject(tag, &obj);
	    }
	    swf_PlaceObjectFree(&obj);
	}

	depth = swf_GetDepth(tag);
	if(depth>=0) {
	    int newdepth = depth+nr;
	    if(newdepth>65535) {
		fprintf(stderr, "Couldn't relocate depths: too large values\n");
		newdepth = 65535;
	    }
	    swf_SetDepth(tag, newdepth);
	}
	tag=tag->next;
    }
}

U8 swf_isShapeTag(TAG*tag)
{
    if(tag->id == ST_DEFINESHAPE ||
       tag->id == ST_DEFINESHAPE2 ||
       tag->id == ST_DEFINESHAPE3 ||
       tag->id == ST_DEFINESHAPE4) 
        return 1;
    return 0;
}

U8 swf_isPlaceTag(TAG*tag)
{
    if(tag->id == ST_PLACEOBJECT ||
       tag->id == ST_PLACEOBJECT2 ||
       tag->id == ST_PLACEOBJECT3)
        return 1;
    return 0;
}
U8 swf_isTextTag(TAG*tag)
{
    if(tag->id == ST_DEFINETEXT ||
       tag->id == ST_DEFINETEXT2)
        return 1;
    return 0;
}

U8 swf_isFontTag(TAG*tag)
{
    if(tag->id == ST_DEFINEFONT ||
       tag->id == ST_DEFINEFONT2 ||
       tag->id == ST_DEFINEFONTINFO)
        return 1;
    return 0;
}

U8  swf_isImageTag(TAG*tag)
{
    if(tag->id == ST_DEFINEBITSJPEG || 
       tag->id == ST_DEFINEBITSJPEG2 || 
       tag->id == ST_DEFINEBITSJPEG3 ||
       tag->id == ST_DEFINEBITSLOSSLESS || 
       tag->id == ST_DEFINEBITSLOSSLESS2)
        return 1;
    return 0;
}

TAG* swf_Concatenate (TAG*list1,TAG*list2)
{
    TAG*tag=0,*lasttag=0;
    char bitmap[65536];
    char depthmap[65536];
    SWF swf1,swf2;
    memset(bitmap, 0, sizeof(bitmap));
    memset(depthmap, 0, sizeof(depthmap));
    memset(&swf1, 0, sizeof(swf1));
    memset(&swf2, 0, sizeof(swf2));

    swf1.firstTag = list1;
    swf_FoldAll(&swf1);
    swf2.firstTag = list2;
    swf_FoldAll(&swf2);

    tag = list1;
    while(tag) {
	if(!swf_isDefiningTag(tag)) {
	    int id = swf_GetDefineID(tag);
	    bitmap[id] = 1;
	}
	if(tag->id == ST_PLACEOBJECT ||
	   tag->id == ST_PLACEOBJECT2) {
	    int depth = swf_GetDepth(tag);
	    depthmap[depth] = 1;
	}
	if(tag->id == ST_REMOVEOBJECT ||
	   tag->id == ST_REMOVEOBJECT2) {
	    int depth = swf_GetDepth(tag);
	    depthmap[depth] = 0;
	}
	tag = tag->next;
	lasttag = tag;
    }
    swf_Relocate(&swf2, bitmap);
    swf_RelocateDepth(&swf2, depthmap);
    lasttag->next = swf2.firstTag;
    swf2.firstTag->prev = lasttag;

    return swf1.firstTag;
}

static int tagHash(TAG*tag)
{
    int t, h=0;
    unsigned int a = 0x6b973e5a;
    /* start at pos 2, as 0 and 1 are the id */
    for(t=2;t<tag->len;t++) {
        unsigned int b = a;
        a >>= 8;
        a += tag->data[t]*0xefbc35a5*b*(t+1);
    }
    return a&0x7fffffff; //always return positive number
}

void swf_Optimize(SWF*swf)
{
    const int hash_size = 131072;
    char* dontremap = rfx_calloc(sizeof(char)*65536);
    U16* remap = rfx_alloc(sizeof(U16)*65536);
    TAG* id2tag = rfx_calloc(sizeof(TAG*)*65536);
    TAG** hashmap = rfx_calloc(sizeof(TAG*)*hash_size);
    TAG* tag;
    int t;
    for(t=0;t<65536;t++) {
        remap[t] = t;
    }

    swf_FoldAll(swf);

    tag = swf->firstTag;
    while(tag) {
        /* make sure we don't remap to this tag,
           as it might have different "helper tags" 
           FIXME: a better way would be to compare
                  the helper tags, too.
         */
        if(swf_isPseudoDefiningTag(tag) &&
           tag->id != ST_NAMECHARACTER) {
            dontremap[swf_GetDefineID(tag)] = 1;
        }
        tag=tag->next;
    }
    tag = swf->firstTag;
    while(tag) {
        TAG*next = tag->next;

        /* remap the tag */
        int num = swf_GetNumUsedIDs(tag);
        int*positions = rfx_alloc(sizeof(int)*num);
        int t;
        swf_GetUsedIDs(tag, positions);
        for(t=0;t<num;t++) {
            int id = GET16(&tag->data[positions[t]]);
            id = remap[id];
            PUT16(&tag->data[positions[t]], id);
        }
        rfx_free(positions);

        /* now look for previous tags with the same
           content */
        if(swf_isDefiningTag(tag)) {
            TAG*tag2;
            int id = swf_GetDefineID(tag);
            int hash = tagHash(tag);
            int match=0;
            if(!dontremap[id]) 
            while((tag2 = hashmap[hash%hash_size])) {
                if(tag2 != (TAG*)0 && tag->len == tag2->len) {
		    if(memcmp(&tag->data[2],&tag2->data[2],tag->len-2) == 0) {
			match = 1;
			break;
		    }
                }
                hash++;
            }
            if(!match) {
                while(hashmap[hash%hash_size]) hash++;
                hashmap[hash%hash_size] = tag;
            } else {
		/* we found two identical tags- remap one
		   of them */
                remap[id] = swf_GetDefineID(tag2);
                swf_DeleteTag(tag);
                if(tag == swf->firstTag)
                    swf->firstTag = next;
            }
        } else if(swf_isPseudoDefiningTag(tag)) {
            int id = swf_GetDefineID(tag);
            if(remap[id]!=id) {
                /* if this tag was remapped, we don't
                   need the helper tag anymore. Discard
                   it. */
                swf_DeleteTag(tag);
                if(tag == swf->firstTag)
                    swf->firstTag = next;
            }
        }

        tag = next;
    }
    
    rfx_free(dontremap);
    rfx_free(remap);
    rfx_free(id2tag);
    rfx_free(hashmap);
}

void swf_SetDefineBBox(TAG * tag, SRECT newbbox)
{
    U16 id = 0;
    SRECT b1;
    swf_SetTagPos(tag,0);

    switch (swf_GetTagID(tag))
    { 
	case ST_DEFINESHAPE:
	case ST_DEFINESHAPE2:
	case ST_DEFINESHAPE3:
	case ST_DEFINEEDITTEXT:
	case ST_DEFINETEXT:
	case ST_DEFINETEXT2:
	case ST_DEFINEVIDEOSTREAM: {
	      U32 after_bbox_offset = 0, len;
	      U8*data;
	      id = swf_GetU16(tag);
	      swf_GetRect(tag, &b1);
	      swf_ResetReadBits(tag);
	      after_bbox_offset = tag->pos;
	      len = tag->len - after_bbox_offset;
	      data = malloc(len);
	      memcpy(data, &tag->data[after_bbox_offset], len);
	      tag->writeBit = 0;
	      tag->len = 2;
	      swf_SetRect(tag, &newbbox);
	      swf_SetBlock(tag, data, len);
	      free(data);
	      tag->pos = tag->readBit = 0;

	} break;
	default:
	    fprintf(stderr, "rfxswf: Tag %d (%s) has no bbox\n", tag->id, swf_TagGetName(tag));
    }
}

RGBA swf_GetSWFBackgroundColor(SWF*swf)
{
    TAG*t=swf->firstTag;
    RGBA color;
    color.r = color.b = color.g = 0;
    color.a = 255;
    while(t) {
	if(t->id == ST_SETBACKGROUNDCOLOR) {
	    swf_SetTagPos(t, 0);
	    color.r = swf_GetU8(t);
	    color.g = swf_GetU8(t);
	    color.b = swf_GetU8(t);
	    break;
	}
	t=t->next;
    }
    return color;
}