3 Math and matrix functions, misc tools
5 Extension module for the rfxswf library.
6 Part of the swftools package.
8 Copyright (c) 2000, 2001 Rainer Böhme <rfxswf@reflex-studio.de>
10 This file is distributed under the GPL, see file COPYING for details
14 // Matrix & Math tools for SWF files
17 SFIXED SP(SFIXED a1,SFIXED a2,SFIXED b1,SFIXED b2)
19 a = (S64)a1*(S64)b1+(S64)a2*(S64)b2;
20 return (SFIXED)(a>>16);
22 SFIXED QFIX(int zaehler,int nenner) // bildet Quotient von zwei INTs in SFIXED
23 { S64 z = zaehler<<16;
24 S64 a = z/(S64)nenner;
29 MATRIX * MatrixJoin(MATRIX * d,MATRIX * s1,MATRIX * s2)
32 if (!s1) return (s2)?(MATRIX *)memcpy(d,s2,sizeof(MATRIX)):NULL;
33 if (!s2) return (MATRIX *)memcpy(d,s1,sizeof(MATRIX));
35 d->tx = s1->tx + s2->tx;
36 d->ty = s1->ty + s2->ty;
38 d->sx = SP(s1->sx,s1->r1,s2->sx,s2->r0);
39 d->sy = SP(s1->r0,s1->sy,s2->r1,s2->sy);
40 d->r0 = SP(s1->r0,s1->sy,s2->sx,s2->r0);
41 d->r1 = SP(s1->sx,s1->r1,s2->r1,s2->sy);
48 MATRIX * MatrixMapTriangle(MATRIX * m,int dx,int dy,int x0,int y0,
49 int x1,int y1,int x2,int y2)
56 if ((!dx)||(!dy)) return NULL; // check DIV by zero
68 U16 GetDefineID(TAG * t)
73 oldTagPos = GetTagPos(t);
77 { case ST_DEFINESHAPE:
80 case ST_DEFINEMORPHSHAPE:
82 case ST_DEFINEBITSJPEG2:
83 case ST_DEFINEBITSJPEG3:
84 case ST_DEFINEBITSLOSSLESS:
85 case ST_DEFINEBITSLOSSLESS2:
87 case ST_DEFINEBUTTON2:
88 case ST_DEFINEBUTTONCXFORM:
89 case ST_DEFINEBUTTONSOUND:
92 case ST_DEFINEFONTINFO:
101 SetTagPos(t,oldTagPos);
106 U16 GetPlaceID(TAG * t)
111 oldTagPos = GetTagPos(t);
115 { case ST_PLACEOBJECT:
116 case ST_REMOVEOBJECT:
121 case ST_PLACEOBJECT2:
122 { U8 flags = GetU8(t);
124 id = (flags&PF_CHAR)?GetU16(t):id;
129 SetTagPos(t,oldTagPos);
134 int definingtagids[] =
147 ST_DEFINEBITSLOSSLESS,
148 ST_DEFINEBITSLOSSLESS2,
157 // tags which may be used inside a sprite definition
163 ST_REMOVEOBJECT2, //?
174 char isAllowedSpriteTag (TAG*tag)
178 while(spritetagids[t]>=0)
180 if(spritetagids[t] == id)
187 char isDefiningTag (TAG*tag)
191 while(definingtagids[t]>=0)
193 if(definingtagids[t] == id)
200 U16 GetDepth(TAG * t)
205 oldTagPos = GetTagPos(t);
209 { case ST_PLACEOBJECT:
210 case ST_REMOVEOBJECT:
214 case ST_REMOVEOBJECT2:
217 case ST_PLACEOBJECT2:
218 { U8 flags = GetU8(t);
222 SetTagPos(t,oldTagPos);
226 char* GetName(TAG * t)
232 oldTagPos = GetTagPos(t);
237 name = &t->data[GetTagPos(t)];
239 case ST_PLACEOBJECT2: {
252 name = &t->data[GetTagPos(t)];
257 SetTagPos(t,oldTagPos);