-/* 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
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <stdio.h>
+#include <stdlib.h>
#include <memory.h>
#include <math.h>
+#include <string.h>
#include <assert.h>
#include "gfxtools.h"
+#include "gfxfont.h"
typedef struct _linedraw_internal
{
static void linedraw_moveTo(gfxdrawer_t*d, gfxcoord_t x, gfxcoord_t y)
{
linedraw_internal_t*i = (linedraw_internal_t*)d->internal;
- gfxline_t*l = rfx_alloc(sizeof(gfxline_t));
+ gfxline_t*l = (gfxline_t*)rfx_alloc(sizeof(gfxline_t));
l->type = gfx_moveTo;
if((int)((d->x * 5120) == (int)(x * 5120)) &&
(int)((d->y * 5120) == (int)(y * 5120))) {
return;
}
+ l->sx = l->sy = 0;
d->x = l->x = x;
d->y = l->y = y;
l->next = 0;
static void linedraw_lineTo(gfxdrawer_t*d, gfxcoord_t x, gfxcoord_t y)
{
linedraw_internal_t*i = (linedraw_internal_t*)d->internal;
- gfxline_t*l = rfx_alloc(sizeof(gfxline_t));
+ gfxline_t*l = (gfxline_t*)rfx_alloc(sizeof(gfxline_t));
+
+ if(!i->start) {
+ /* starts with a line, not with a moveto. That needs we first
+ need an explicit moveto to (0,0) */
+ linedraw_moveTo(d, 0, 0);
+ }
+
l->type = gfx_lineTo;
d->x = l->x = x;
d->y = l->y = y;
+
l->next = 0;
if(i->next)
i->next->next = l;
static void linedraw_splineTo(gfxdrawer_t*d, gfxcoord_t sx, gfxcoord_t sy, gfxcoord_t x, gfxcoord_t y)
{
linedraw_internal_t*i = (linedraw_internal_t*)d->internal;
- gfxline_t*l = rfx_alloc(sizeof(gfxline_t));
+ gfxline_t*l = (gfxline_t*)rfx_alloc(sizeof(gfxline_t));
+
+ if(!i->start) {
+ /* starts with a line, not with a moveto. That needs we first
+ need an explicit moveto to (0,0) */
+ linedraw_moveTo(d, 0, 0);
+ }
+
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)
void gfxdrawer_target_gfxline(gfxdrawer_t*d)
{
linedraw_internal_t*i = (linedraw_internal_t*)rfx_calloc(sizeof(linedraw_internal_t));
+ d->x = 0x7fffffff;
+ d->y = 0x7fffffff;
d->internal = i;
d->moveTo = linedraw_moveTo;
d->lineTo = linedraw_lineTo;
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;
}
}
}
+gfxline_t * gfxline_clone(gfxline_t*line)
+{
+ gfxline_t*dest = 0;
+ gfxline_t*pos = 0;
+ while(line) {
+ gfxline_t*n = (gfxline_t*)rfx_calloc(sizeof(gfxline_t));
+ *n = *line;
+ n->next = 0;
+ if(!pos) {
+ dest = pos = n;
+ } else {
+ pos->next = n;
+ pos = n;
+ }
+ line = line->next;
+ }
+ 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 && splineIsStraight(x,y,l)) {
+ l->type = gfx_lineTo;
+ }
+ x = l->x;
+ y = l->y;
+ l = l->next;
+ }
+ /* step 2: combine adjacent lines and splines, where possible */
+ l = line;
+ while(l && l->next) {
+ gfxline_t*next = l->next;
+ char combine = 0;
+ double sx=0,sy=0;
+ if(l->type == gfx_lineTo && next->type == gfx_lineTo) {
+ double dx = l->x-x;
+ double dy = l->y-y;
+ double nx = next->x-l->x;
+ double ny = next->y-l->y;
+ if(fabs(dx*ny - dy*nx) < 0.000001 && (dx*nx + dy*ny) >= 0) {
+ combine = 1;
+ }
+ } else if(l->type == gfx_splineTo && next->type == gfx_splineTo) {
+ /* TODO */
+ }
+ if(combine) {
+ l->next = next->next;
+ next->next = 0;
+ l->x = next->x;
+ l->y = next->y;
+ l->sx = sx;
+ l->sy = sy;
+ rfx_free(next);
+ } else {
+ x = l->x;
+ y = l->y;
+ l = l->next;
+ }
+ }
+}
+
gfxline_t* gfxtool_dash_line(gfxline_t*line, float*dashes, float phase)
{
gfxdrawer_t d;
void gfxline_show(gfxline_t*l, FILE*fi)
{
while(l) {
- if(l->type == moveTo) {
+ if(l->type == gfx_moveTo) {
fprintf(fi, "moveTo %.2f,%.2f\n", l->x, l->y);
}
- if(l->type == lineTo) {
+ if(l->type == gfx_lineTo) {
fprintf(fi, "lineTo %.2f,%.2f\n", l->x, l->y);
}
- if(l->type == splineTo) {
+ if(l->type == gfx_splineTo) {
fprintf(fi, "splineTo %.2f,%.2f %.2f,%.2f\n", l->sx, l->sy, l->x, l->y);
}
l = l->next;
void gfxline_free(gfxline_t*l)
{
- gfxline_t*next;
- while(l) {
- next = l->next;
- l->next = 0;
+ if(l && (l+1) == l->next) {
+ /* flattened */
rfx_free(l);
- l = next;
+ } else {
+ gfxline_t*next;
+ while(l) {
+ next = l->next;
+ l->next = 0;
+ rfx_free(l);
+ l = next;
+ }
}
}
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;
test.control.y += test.end.y;
}
-#define PROBES
+//#define PROBES
#ifdef PROBES
/* measure the spline's accurancy, by taking a number of probes */
for(t=0;t<probes;t++) {
}
#else // quadratic error: *much* faster!
- /* convert control point representation to
+ /* convert control point representation to
d*x^3 + c*x^2 + b*x + a */
-
- /* FIXME: we need to do this for the subspline between [start,end],
- not [0,1] */
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]
+ 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. */
+ {double m = end-start;
+ 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.
- (it boils down to const*d^2)
- */
+ to measure the approximation quality.
+ (it boils down to const*d^2) */
recurse = (dx*dx + dy*dy > quality2);
#endif
return num;
}
-void gfxdraw_cubicTo(gfxdrawer_t*draw, double c1x, double c1y, double c2x, double c2y, double x, double y)
+void gfxdraw_conicTo(gfxdrawer_t*draw, double cx, double cy, double tox, double toy, double quality)
+{
+ double c1x = (draw->x + 2 * cx) / 3;
+ double c1y = (draw->y + 2 * cy) / 3;
+ double c2x = (2 * cx + tox) / 3;
+ double c2y = (2 * cy + toy) / 3;
+ gfxdraw_cubicTo(draw, c1x, c1y, c2x, c2y, tox, toy, quality);
+}
+
+
+void gfxdraw_cubicTo(gfxdrawer_t*draw, double c1x, double c1y, double c2x, double c2y, double x, double y, double quality)
{
qspline_t q[128];
cspline_t c;
- double maxerror = 0.04;
+ double maxerror = quality>0 ? quality : 1.0;
int t,num;
c.start.x = draw->x;
c.control2.y = c2y;
c.end.x = x;
c.end.y = y;
-
- num = approximate3(&c, q, 128, maxerror*maxerror);
+
+ num = approximate3(&c, q, 128, maxerror);
for(t=0;t<num;t++) {
gfxpoint_t mid;
return box;
}
+void gfxbbox_intersect(gfxbbox_t*box1, gfxbbox_t*box2)
+{
+ if(box2->xmin > box1->xmin)
+ box1->xmin = box2->xmin;
+ if(box2->ymin > box1->ymin)
+ box1->ymin = box2->ymin;
+ if(box2->xmax < box1->xmax)
+ box1->xmax = box2->xmax;
+ if(box2->ymax > box1->ymax)
+ box1->ymax = box2->ymax;
+ if(box1->xmin > box1->xmax)
+ box1->xmax = box1->xmin;
+ if(box1->ymin > box1->ymax)
+ box1->ymax = box1->ymin;
+}
+
gfxbbox_t gfxline_getbbox(gfxline_t*line)
{
gfxcoord_t x=0,y=0;
return bbox;
}
+gfxline_t* gfxline_append(gfxline_t*line1, gfxline_t*line2)
+{
+ gfxline_t*l = line1;;
+ if(!l)
+ return line2;
+ while(l->next) {
+ l = l->next;
+ }
+ l->next = line2;
+ return line1;
+}
+
+void gfxline_transform(gfxline_t*line, gfxmatrix_t*matrix)
+{
+ while(line) {
+ double x = matrix->m00*line->x + matrix->m10*line->y + matrix->tx;
+ double y = matrix->m01*line->x + matrix->m11*line->y + matrix->ty;
+ line->x = x;
+ line->y = y;
+ if(line->type == gfx_splineTo) {
+ double sx = matrix->m00*line->sx + matrix->m10*line->sy + matrix->tx;
+ double sy = matrix->m01*line->sx + matrix->m11*line->sy + matrix->ty;
+ line->sx = sx;
+ line->sy = sy;
+ }
+ line = line->next;
+ }
+}
+
+void gfxmatrix_dump(gfxmatrix_t*m, FILE*fi, char*prefix)
+{
+ fprintf(fi, "%f %f | %f\n", m->m00, m->m10, m->tx);
+ fprintf(fi, "%f %f | %f\n", m->m01, m->m11, m->ty);
+}
+
+void gfxmatrix_transform(gfxmatrix_t*m, double* v, double*dest)
+{
+ dest[0] = m->m00*v[0] + m->m10*v[1] + m->tx;
+ dest[1] = m->m01*v[0] + m->m11*v[1] + m->ty;
+}
+void gfxmatrix_invert(gfxmatrix_t*m, gfxmatrix_t*dest)
+{
+ double det = m->m00 * m->m11 - m->m10 * m->m01;
+ if(!det) {
+ memset(dest, 0, sizeof(gfxmatrix_t));
+ return;
+ }
+ det = 1/det;
+ dest->m00 = m->m11 * det;
+ dest->m01 = -m->m01 * det;
+ dest->m10 = -m->m10 * det;
+ dest->m11 = m->m00 * det;
+ dest->tx = -(dest->m00 * m->tx + dest->m10 * m->ty);
+ dest->ty = -(dest->m01 * m->tx + dest->m11 * m->ty);
+}
+void gfxmatrix_unit(gfxmatrix_t*m)
+{
+ memset(m, 0, sizeof(gfxmatrix_t));
+ m->m00 = 1.0;
+ m->m11 = 1.0;
+}
+void gfxmatrix_multiply(gfxmatrix_t*m1, gfxmatrix_t*m2, gfxmatrix_t*dest)
+{
+ dest->m00 = m1->m00*m2->m00 + m1->m10*m2->m01;
+ dest->m01 = m1->m01*m2->m00 + m1->m11*m2->m01;
+ dest->m10 = m1->m00*m2->m10 + m1->m10*m2->m11;
+ dest->m11 = m1->m01*m2->m10 + m1->m11*m2->m11;
+ dest->tx = m1->m00*m2->tx + m1->m10*m2->ty + m1->tx;
+ dest->ty = m1->m01*m2->tx + m1->m11*m2->ty + m1->ty;
+}
+
+gfxfontlist_t* gfxfontlist_create()
+{
+ /* Initial list ist empty */
+ return 0;
+}
+
+gfxfont_t*gfxfontlist_findfont(gfxfontlist_t*list, char*id)
+{
+ gfxfontlist_t*l = list;
+ while(l) {
+ if(!strcmp((char*)l->font->id, id)) {
+ return l->font;
+ }
+ l = l->next;
+ }
+ return 0;
+}
+char gfxfontlist_hasfont(gfxfontlist_t*list, gfxfont_t*font)
+{
+ gfxfontlist_t*l = list;
+ while(l) {
+ if(!strcmp((char*)l->font->id, font->id)) {
+ return 1;
+ }
+ l = l->next;
+ }
+ return 0;
+}
+gfxfontlist_t*gfxfontlist_addfont(gfxfontlist_t*list, gfxfont_t*font)
+{
+ gfxfontlist_t*last=0,*l = list;
+ while(l) {
+ last = l;
+ if(l->font == font) {
+ return list; // we already know this font
+ }
+ l = l->next;
+ }
+ if(!font) {
+ fprintf(stderr, "Tried to add zero font\n");
+ }
+ l = (gfxfontlist_t*)rfx_calloc(sizeof(gfxfontlist_t));
+ l->font = font;
+ l->next = 0;
+ if(last) {
+ last->next = l;
+ return list;
+ } else {
+ return l;
+ }
+}
+void gfxfontlist_free(gfxfontlist_t*list, char deletefonts)
+{
+ gfxfontlist_t*l = list;
+ while(l) {
+ gfxfontlist_t*next = l->next;
+ if(deletefonts && l->font) {
+ gfxfont_free(l->font);l->font=0;
+ }
+ l->next = 0;
+ free(l);
+ l = next;
+ }
+}
+
+gfxline_t*gfxline_makerectangle(int x1,int y1,int x2, int y2)
+{
+ gfxline_t* line = (gfxline_t*)rfx_calloc(sizeof(gfxline_t)*5);
+ line[0].x = x1;line[0].y = y1;line[0].type = gfx_moveTo;line[0].next = &line[1];
+ line[1].x = x2;line[1].y = y1;line[1].type = gfx_lineTo;line[1].next = &line[2];
+ line[2].x = x2;line[2].y = y2;line[2].type = gfx_lineTo;line[2].next = &line[3];
+ line[3].x = x1;line[3].y = y2;line[3].type = gfx_lineTo;line[3].next = &line[4];
+ line[4].x = x1;line[4].y = y1;line[4].type = gfx_lineTo;
+ 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;
+ int size = img->width*img->height;
+
+ int rr,rg,rb,ra, tr;
+ int gr,gg,gb,ga, tg;
+ int br,bg,bb,ba, tb;
+ int ar,ag,ab,aa, ta;
+ rr = (int)(cxform->rr*256);gr = (int)(cxform->gr*256);
+ rg = (int)(cxform->rg*256);gg = (int)(cxform->gg*256);
+ rb = (int)(cxform->rb*256);gb = (int)(cxform->gb*256);
+ ra = (int)(cxform->ra*256);ga = (int)(cxform->ga*256);
+ br = (int)(cxform->br*256);ar = (int)(cxform->ar*256);tr = (int)(cxform->tr*256);
+ bg = (int)(cxform->bg*256);ag = (int)(cxform->ag*256);tg = (int)(cxform->tg*256);
+ bb = (int)(cxform->bb*256);ab = (int)(cxform->ab*256);tb = (int)(cxform->tb*256);
+ ba = (int)(cxform->ba*256);aa = (int)(cxform->aa*256);ta = (int)(cxform->ta*256);
+
+ for(t=0;t<size;t++) {
+ gfxcolor_t*pixel = &img->data[t];
+ unsigned char r = (pixel->r * rr + pixel->g * rg + pixel->b * rb + pixel->a * ra + tr) / 256;
+ unsigned char g = (pixel->r * gr + pixel->g * gg + pixel->b * gb + pixel->a * ga + tg) / 256;
+ unsigned char b = (pixel->r * br + pixel->g * bg + pixel->b * bb + pixel->a * ba + tb) / 256;
+ unsigned char a = (pixel->r * ar + pixel->g * ag + pixel->b * ab + pixel->a * aa + ta) / 256;
+ pixel->r = r;
+ pixel->g = g;
+ pixel->b = b;
+ pixel->a = a;
+ }
+}
void gfxline_dump(gfxline_t*line, FILE*fi, char*prefix)
{
while(line) {
git.asbjorn.biz / swftools.git / blobdiff