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 RFXSWF_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 RFXSWF_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 * swf_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 = RFXSWF_SP(s1->sx,s1->r1,s2->sx,s2->r0);
39 d->sy = RFXSWF_SP(s1->r0,s1->sy,s2->r1,s2->sy);
40 d->r0 = RFXSWF_SP(s1->r0,s1->sy,s2->sx,s2->r0);
41 d->r1 = RFXSWF_SP(s1->sx,s1->r1,s2->r1,s2->sy);
48 MATRIX * swf_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
60 m->sx = RFXSWF_QFIX(dx1,dx);
61 m->sy = RFXSWF_QFIX(dy2,dy);
62 m->r0 = RFXSWF_QFIX(dy1,dx);
63 m->r1 = RFXSWF_QFIX(dx2,dy);
68 U16 swf_GetDefineID(TAG * t)
73 oldTagPos = swf_GetTagPos(t);
76 switch (swf_GetTagID(t))
77 { case ST_DEFINESHAPE:
80 case ST_DEFINEMORPHSHAPE:
81 case ST_DEFINEEDITTEXT:
83 case ST_DEFINEBITSJPEG2:
84 case ST_DEFINEBITSJPEG3:
85 case ST_DEFINEBITSLOSSLESS:
86 case ST_DEFINEBITSLOSSLESS2:
88 case ST_DEFINEBUTTON2:
89 case ST_DEFINEBUTTONCXFORM:
90 case ST_DEFINEBUTTONSOUND:
93 case ST_DEFINEFONTINFO: //psedodefine
102 swf_SetTagPos(t,oldTagPos);
107 U16 swf_GetPlaceID(TAG * t)
112 oldTagPos = swf_GetTagPos(t);
115 switch (swf_GetTagID(t))
116 { case ST_PLACEOBJECT:
117 case ST_REMOVEOBJECT:
122 case ST_PLACEOBJECT2:
123 { U8 flags = swf_GetU8(t);
124 U16 d = swf_GetU16(t);
125 id = (flags&PF_CHAR)?swf_GetU16(t):id;
130 swf_SetTagPos(t,oldTagPos);
135 static int swf_definingtagids[] =
148 ST_DEFINEBITSLOSSLESS,
149 ST_DEFINEBITSLOSSLESS2,
158 // tags which may be used inside a sprite definition
159 static int swf_spritetagids[] =
164 ST_REMOVEOBJECT2, //?
175 static int swf_pseudodefiningtagids[] =
181 U8 swf_isAllowedSpriteTag(TAG * tag)
185 while(swf_spritetagids[t]>=0)
187 if(swf_spritetagids[t] == id)
194 U8 swf_isDefiningTag(TAG * tag)
198 while(swf_definingtagids[t]>=0)
200 if(swf_definingtagids[t] == id)
207 U8 swf_isPseudoDefiningTag(TAG * tag)
211 while(swf_pseudodefiningtagids[t]>=0)
213 if(swf_pseudodefiningtagids[t] == id)
220 U16 swf_GetDepth(TAG * t)
225 oldTagPos = swf_GetTagPos(t);
228 switch (swf_GetTagID(t))
229 { case ST_PLACEOBJECT:
230 case ST_REMOVEOBJECT:
232 depth = swf_GetU16(t);
234 case ST_REMOVEOBJECT2:
235 depth = swf_GetU16(t);
237 case ST_PLACEOBJECT2:
238 { U8 flags = swf_GetU8(t);
239 depth = swf_GetU16(t);
242 swf_SetTagPos(t,oldTagPos);
246 char* swf_GetName(TAG * t)
252 oldTagPos = swf_GetTagPos(t);
254 switch(swf_GetTagID(t))
257 name = &t->data[swf_GetTagPos(t)];
259 case ST_PLACEOBJECT2: {
260 U8 flags = swf_GetU8(t);
261 swf_GetU16(t); //depth;
265 swf_GetMatrix(t, &m);
267 swf_GetCXForm(t, &c, 1);
271 swf_ResetReadBits(t);
272 name = &t->data[swf_GetTagPos(t)];
277 swf_SetTagPos(t,oldTagPos);