-/* gfxtools.c
+/* gfxtools.c
Various utility functions for dealing with gfxdevices.
Part of the swftools package.
- Copyright (c) 2005 Matthias Kramm <kramm@quiss.org>
+ Copyright (c) 2005 Matthias Kramm <kramm@quiss.org>
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
}
l->type = gfx_splineTo;
- d->x = l->x = x;
+ d->x = l->x = x;
d->y = l->y = y;
- l->sx = sx;
+ l->sx = sx;
l->sy = sy;
l->next = 0;
if(i->next)
static void mkspline(qspline_abc_t*s, double x, double y, gfxline_t*l)
{
- /*
+ /*
Form 1: x = t*t*l->x + 2*t*(1-t)*l->sx + (1-t)*(1-t)*x;
Form 2: x = a*t*t + b*t + c
*/
double dy = s->ay*(2*i+1)*r2 + s->by*r;
len += sqrt(dx*dx+dy*dy);
}
- /*printf("Spline from %f,%f to %f,%f has len %f (%f)\n", s->cx, s->cy,
+ /*printf("Spline from %f,%f to %f,%f has len %f (%f)\n", s->cx, s->cy,
s->cx + s->bx + s->ax,
s->cy + s->by + s->ay, len,
sqrt((s->bx + s->ax)*(s->bx + s->ax) + (s->by + s->ay)*(s->by + s->ay))
double x=0,y=0;
double linepos,nextpos;
char on;
- int apos;
+ int apos=0;
if(line && line->type != gfx_moveTo) {
fprintf(stderr, "gfxtool: outline doesn't start with a moveTo");
return;
}
- if(!r || r[0]<0 || phase<0) {
- fprintf(stderr, "gfxtool: invalid dashes");
+
+ int i;
+ double dashlen=0;
+ for(i=0;r[i]>=0;i++) {
+ dashlen+=r[i];
+ }
+ if(!r || (r[0]<=0 && r[0]>-0.01) || dashlen<0.001) {
+ // no dashing. just draw the thing
+ while(line) {
+ if(line->type == gfx_moveTo) {
+ d->moveTo(d, line->x, line->y);
+ } else if(line->type == gfx_lineTo) {
+ d->lineTo(d, line->x, line->y);
+ } else if(line->type == gfx_splineTo) {
+ d->splineTo(d, line->sx, line->sy, line->x, line->y);
+ }
+ line = line->next;
+ }
+ return;
+ }
+ if(r[0]<0 || phase<0) {
+ fprintf(stderr, "gfxtool: invalid (negative) dashes: %f, phase=%f", r[0], phase);
return;
}
}
return dest;
}
+
+static char splineIsStraight(double x, double y, gfxline_t*l)
+{
+ if(l->type == gfx_moveTo)
+ return 0;
+ if(l->type == gfx_lineTo)
+ return 1;
+ double dx = l->x-x;
+ double dy = l->y-y;
+ double sx = l->sx-x;
+ double sy = l->sy-y;
+ if(fabs(dx*sy - dy*sx) < 0.000001 && (dx*sx + dy*sy) >= 0) {
+ return 1;
+ }
+ return 0;
+}
+
void gfxline_optimize(gfxline_t*line)
{
gfxline_t*l = line;
/* step 1: convert splines to lines, where possible */
double x=0,y=0;
while(l) {
- if(l->type == gfx_splineTo) {
- double dx = l->x-x;
- double dy = l->y-y;
- double sx = l->sx-x;
- double sy = l->sy-y;
- if(fabs(dx*sy - dy*sx) < 0.000001 && (dx*sx + dy*sy) >= 0) {
- l->type = gfx_lineTo;
- }
+ if(l->type == gfx_splineTo && splineIsStraight(x,y,l)) {
+ l->type = gfx_lineTo;
}
x = l->x;
y = l->y;
unsigned int istart = 0;
int num = 0;
int level = 0;
-
+
while(istart<0x80000000)
{
unsigned int iend = istart + istep;
/* depending on where we are in the spline, we either try to match
the left or right tangent */
- if(start<0.5)
+ if(start<0.5)
left=1;
/* get derivative */
pos = left?start:end;
qpos = pos*pos;
- test.control.x = s->end.x*(3*qpos) + 3*s->control2.x*(2*pos-3*qpos) +
+ test.control.x = s->end.x*(3*qpos) + 3*s->control2.x*(2*pos-3*qpos) +
3*s->control1.x*(1-4*pos+3*qpos) + s->start.x*(-3+6*pos-3*qpos);
- test.control.y = s->end.y*(3*qpos) + 3*s->control2.y*(2*pos-3*qpos) +
+ test.control.y = s->end.y*(3*qpos) + 3*s->control2.y*(2*pos-3*qpos) +
3*s->control1.y*(1-4*pos+3*qpos) + s->start.y*(-3+6*pos-3*qpos);
if(left) {
test.control.x *= (end-start)/2;
}
#else // quadratic error: *much* faster!
- /* convert control point representation to
+ /* convert control point representation to
d*x^3 + c*x^2 + b*x + a */
dx= s->end.x - s->control2.x*3 + s->control1.x*3 - s->start.x;
dy= s->end.y - s->control2.y*3 + s->control1.y*3 - s->start.y;
-
- /* we need to do this for the subspline between [start,end], not [0,1]
+
+ /* we need to do this for the subspline between [start,end], not [0,1]
as a transformation of t->a*t+b does nothing to highest coefficient
of the spline except multiply it with a^3, we just need to modify
d here. */
dx*=m*m*m;
dy*=m*m*m;
}
-
+
/* use the integral over (f(x)-g(x))^2 between 0 and 1
- to measure the approximation quality.
+ to measure the approximation quality.
(it boils down to const*d^2) */
recurse = (dx*dx + dy*dy > quality2);
#endif
c.control2.y = c2y;
c.end.x = x;
c.end.y = y;
-
+
num = approximate3(&c, q, 128, maxerror);
for(t=0;t<num;t++) {
return bbox;
}
-void gfxline_dump(gfxline_t*line, FILE*fi, char*prefix)
-{
- while(line) {
- if(line->type == gfx_moveTo) {
- fprintf(fi, "%smoveTo %.2f %.2f\n", prefix, line->x, line->y);
- } else if(line->type == gfx_lineTo) {
- fprintf(fi, "%slineTo %.2f %.2f\n", prefix, line->x, line->y);
- } else if(line->type == gfx_splineTo) {
- fprintf(fi, "%ssplineTo (%.2f %.2f) %.2f %.2f\n", prefix, line->sx, line->sy, line->x, line->y);
- }
- line = line->next;
- }
-}
-
gfxline_t* gfxline_append(gfxline_t*line1, gfxline_t*line2)
{
gfxline_t*l = line1;;
return line;
}
+gfxbbox_t* gfxline_isrectangle(gfxline_t*_l)
+{
+ if(!_l)
+ return 0;
+
+ gfxline_t*l = gfxline_clone(_l);
+ gfxline_optimize(l);
+
+ double x1,x2,y1,y2;
+ int xc=0,yc=0;
+ char corners=0;
+
+ char prev=0;
+ char fail=0;
+ for(;l; l=l->next) {
+ double x = l->x;
+ double y = l->y;
+
+ char top=0,left=0;
+
+ if(xc==2 && x!=x1 && x!=x2) {fail=1;break;}
+ else if(xc>=1 && x==x1) {left=0;}
+ else if(xc==2 && x==x2) {left=1;}
+ else if(xc==1 && x!=x1) {x2 = x; xc=2; left=1;}
+ else if(xc==0) {x1 = x; xc=1;left=0;}
+ else {fprintf(stderr, "Internal error in rectangle detection\n");}
+
+ if(yc==2 && y!=y1 && y!=y2) {fail=1;break;}
+ else if(yc>=1 && y==y1) {top=0;}
+ else if(yc==2 && y==y2) {top=1;}
+ else if(yc==1 && y!=y1) {y2 = y; yc=2; top=1;}
+ else if(yc==0) {y1 = y; yc=1;top=0;}
+ else {fprintf(stderr, "Internal error in rectangle detection\n");}
+
+ char pos=top<<1|left;
+
+ if((pos^prev)==3) {
+ /* diagonal lines not allowed */
+ fail=1;break;
+ }
+ prev = pos;
+
+ /* no corner except the first one may be touched twice */
+ if(pos && (corners & 1<<pos)) {
+ fail=1;break;
+ }
+ /* mark which corners have been touched so far */
+ corners |= 1<<pos;
+ }
+ if(fail) {
+ gfxline_free(l);
+ return 0;
+ }
+
+ if(corners!=0x0f) return 0; // not all 4 corners reached
+
+ if(x2<x1) {double x = x2;x2=x1;x1=x;}
+ if(y2<y1) {double y = y2;y2=y1;y1=y;}
+
+ gfxbbox_t*r = malloc(sizeof(gfxbbox_t));
+ r->xmin = x1; r->ymin = y1;
+ r->xmax = x2; r->ymax = y2;
+ return r;
+}
+
void gfximage_transform(gfximage_t*img, gfxcxform_t*cxform)
{
int t;
pixel->a = a;
}
}
+void gfxline_dump(gfxline_t*line, FILE*fi, char*prefix)
+{
+ while(line) {
+ if(line->type == gfx_moveTo) {
+ fprintf(fi, "%smoveTo %.2f %.2f\n", prefix, line->x, line->y);
+ } else if(line->type == gfx_lineTo) {
+ fprintf(fi, "%slineTo %.2f %.2f\n", prefix, line->x, line->y);
+ } else if(line->type == gfx_splineTo) {
+ fprintf(fi, "%ssplineTo (%.2f %.2f) %.2f %.2f\n", prefix, line->sx, line->sy, line->x, line->y);
+ }
+ line = line->next;
+ }
+}
+
git.asbjorn.biz / swftools.git / blobdiff