X-Git-Url: http://git.asbjorn.biz/?p=swftools.git;a=blobdiff_plain;f=lib%2Fgfxtools.c;h=f6853daff5caa667b665277df2342cbc6d29b7de;hp=296bea103060ec3476f249b29cce886e2b8ba4c6;hb=395359a0831639fcc30aab4ea897e23ff8ab420c;hpb=3517626b913b0543bce4f9644005c1faba8d0580

diff --git a/lib/gfxtools.c b/lib/gfxtools.c
index 296bea1..f6853da 100644
--- a/lib/gfxtools.c
+++ b/lib/gfxtools.c
@@ -1,10 +1,10 @@
-/* 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
@@ -21,28 +21,33 @@
    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"
+#include "jpeg.h"
+#include "q.h"
 
 typedef struct _linedraw_internal
 {
     gfxline_t*start;
     gfxline_t*next;
+    gfxcoord_t x0,y0;
+    char has_moveto;
 } linedraw_internal_t;
 
 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))) {
-	/* never mind- we're already there */
-	return;
-
-    }
+    i->has_moveto = 1;
+    i->x0 = x;
+    i->y0 = y;
+    l->sx = l->sy = 0;
     d->x = l->x = x;
     d->y = l->y = y;
     l->next = 0;
@@ -55,10 +60,18 @@ static void linedraw_moveTo(gfxdrawer_t*d, gfxcoord_t x, gfxcoord_t y)
 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));
+    if(!i->has_moveto) {
+	/* starts with a line, not with a moveto. As this is the first
+	   entry in the list, this is probably *meant* to be a moveto */
+	linedraw_moveTo(d, x, y);
+	return;
+    }
+    
+    gfxline_t*l = (gfxline_t*)rfx_alloc(sizeof(gfxline_t));
     l->type = gfx_lineTo;
     d->x = l->x = x;
     d->y = l->y = y;
+
     l->next = 0;
     if(i->next)
 	i->next->next = l;
@@ -69,11 +82,16 @@ static void linedraw_lineTo(gfxdrawer_t*d, gfxcoord_t x, gfxcoord_t y)
 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));
+    if(!i->has_moveto) {
+	linedraw_moveTo(d, x, y);
+	return;
+    }
+
+    gfxline_t*l = (gfxline_t*)rfx_alloc(sizeof(gfxline_t));
     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)
@@ -82,6 +100,16 @@ static void linedraw_splineTo(gfxdrawer_t*d, gfxcoord_t sx, gfxcoord_t sy, gfxco
     if(!i->start)
 	i->start = l;
 }
+static void linedraw_close(gfxdrawer_t*d)
+{
+    linedraw_internal_t*i = (linedraw_internal_t*)d->internal;
+    if(!i->has_moveto) 
+	return;
+    linedraw_lineTo(d, i->x0, i->y0);
+    i->has_moveto = 0;
+    i->x0 = 0;
+    i->y0 = 0;
+}
 static void* linedraw_result(gfxdrawer_t*d)
 {
     linedraw_internal_t*i = (linedraw_internal_t*)d->internal;
@@ -94,10 +122,13 @@ static void* linedraw_result(gfxdrawer_t*d)
 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;
     d->splineTo = linedraw_splineTo;
+    d->close = linedraw_close;
     d->result = linedraw_result;
 }
 
@@ -124,7 +155,7 @@ typedef struct cspline_t
 
 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
     */
@@ -161,7 +192,7 @@ static double get_spline_len(qspline_abc_t*s)
 	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))
@@ -176,14 +207,34 @@ void gfxtool_draw_dashed_line(gfxdrawer_t*d, gfxline_t*line, float*r, float phas
     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\n", r[0], phase);
 	return;
     }
 
@@ -280,6 +331,87 @@ void gfxtool_draw_dashed_line(gfxdrawer_t*d, gfxline_t*line, float*r, float phas
     }
 }
 
+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;
@@ -293,13 +425,13 @@ gfxline_t* gfxtool_dash_line(gfxline_t*line, float*dashes, float phase)
 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;
@@ -308,12 +440,17 @@ void gfxline_show(gfxline_t*l, FILE*fi)
 
 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;
+	}
     }
 }
 
@@ -346,7 +483,7 @@ static int approximate3(const cspline_t*s, qspline_t*q, int size, double quality
     unsigned int istart = 0;
     int num = 0;
     int level = 0;
-    
+
     while(istart<0x80000000)
     {
 	unsigned int iend = istart + istep;
@@ -371,14 +508,14 @@ static int approximate3(const cspline_t*s, qspline_t*q, int size, double quality
 
 	/* 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;
@@ -392,7 +529,7 @@ static int approximate3(const cspline_t*s, qspline_t*q, int size, double quality
 	    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++) {
@@ -423,18 +560,23 @@ static int approximate3(const cspline_t*s, qspline_t*q, int size, double quality
 	}
 #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
 
@@ -454,11 +596,21 @@ static int approximate3(const cspline_t*s, qspline_t*q, int size, double quality
     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;
@@ -469,8 +621,8 @@ void gfxdraw_cubicTo(gfxdrawer_t*draw, double c1x, double c1y, double c2x, doubl
     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;
@@ -504,6 +656,29 @@ gfxbbox_t gfxbbox_expand_to_point(gfxbbox_t box, gfxcoord_t x, gfxcoord_t y)
     return box;
 }
 
+gfxbbox_t gfxbbox_expand_to_bbox(gfxbbox_t box, gfxbbox_t box2)
+{
+    gfxbbox_expand_to_point(box, box2.xmin, box2.ymin);
+    gfxbbox_expand_to_point(box, box2.xmax, box2.ymax);
+    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;
@@ -529,6 +704,300 @@ gfxbbox_t gfxline_getbbox(gfxline_t*line)
     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, "%s%f %f | %f\n", prefix, m->m00, m->m10, m->tx);
+    fprintf(fi, "%s%f %f | %f\n", prefix, 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;
+}
+void*gfxfontlist_getuserdata(gfxfontlist_t*list, const char*id)
+{
+    gfxfontlist_t*l = list;
+    while(l) {
+	if(!strcmp((char*)l->font->id, id)) {
+	    return l->user;
+	}
+	l = l->next;
+    }
+    return 0;
+}
+gfxfontlist_t*gfxfontlist_addfont2(gfxfontlist_t*list, gfxfont_t*font, void*user)
+{
+    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->user = user;
+    l->next = 0;
+    if(last) {
+	last->next = l;
+	return list;
+    } else {
+	return l;
+    }
+}
+gfxfontlist_t*gfxfontlist_addfont(gfxfontlist_t*list, gfxfont_t*font)
+{
+    return gfxfontlist_addfont2(list, font, 0);
+}
+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(double x1,double y1,double x2, double 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;
+}
+
+gfxline_t*gfxline_makecircle(double x,double y,double rx, double ry)
+{
+    double C1 = 0.2930;    
+    double C2 = 0.4140;   
+    double begin = 0.7070; 
+    gfxline_t** line = (gfxline_t**)rfx_calloc(sizeof(gfxline_t*)*9);
+    int t;
+    for(t=0;t<9;t++) {
+	line[t] = rfx_calloc(sizeof(gfxline_t));
+    }
+    line[0]->type = gfx_moveTo;
+    line[0]->x = x+begin*rx;
+    line[0]->y = y+begin*ry;
+    for(t=1;t<9;t++) {
+	line[t-1]->next = line[t];
+	line[t]->type = gfx_splineTo;
+    }
+    line[8]->next = 0;
+#define R(nr,cx,cy,mx,my) \
+    line[nr]->sx = line[nr-1]->x + (cx); \
+    line[nr]->sy = line[nr-1]->y + (cy); \
+    line[nr]->x = line[nr]->sx + (mx); \
+    line[nr]->y = line[nr]->sy + (my);
+    R(1, -C1*rx,  C1*ry, -C2*rx,      0);
+    R(2, -C2*rx,      0, -C1*rx, -C1*ry);
+    R(3, -C1*rx, -C1*ry,      0, -C2*ry);
+    R(4,      0, -C2*ry,  C1*rx, -C1*ry);
+    R(5,  C1*rx, -C1*ry,  C2*rx,      0);
+    R(6,  C2*rx,      0,  C1*rx,  C1*ry);
+    R(7,  C1*rx,  C1*ry,      0,  C2*ry);
+    R(8,      0,  C2*ry, -C1*rx,  C1*ry);
+    gfxline_t*l = line[0];
+    free(line);
+    return l;
+}
+
+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) {
@@ -543,3 +1012,188 @@ void gfxline_dump(gfxline_t*line, FILE*fi, char*prefix)
     }
 }
 
+static char gfxpoint_equals(void*c1, void*c2)
+{
+    return !memcmp(c1, c2, sizeof(gfxpoint_t));
+}
+static unsigned int gfxpoint_hash(void*c)
+{
+    return string_hash3(c, sizeof(gfxpoint_t));
+}
+static void* gfxpoint_clone(void*c)
+{
+    void*n = malloc(sizeof(gfxpoint_t));
+    memcpy(n, c, sizeof(gfxpoint_t));
+    return n;
+}
+static void gfxpoint_destroy(void*c)
+{
+    free(c);
+}
+static type_t gfxpoint_type = {
+    hash: (hash_func)gfxpoint_hash,
+    equals: (equals_func)gfxpoint_equals,
+    dup: (dup_func)gfxpoint_clone,
+    free: (free_func)gfxpoint_destroy,
+};
+
+gfxline_t* gfxline_restitch(gfxline_t*line)
+{
+    dict_t*ff = dict_new2(&gfxpoint_type);
+    dict_t*rev = dict_new2(&gfxpoint_type);
+    
+    gfxline_t*prev=0;
+    while(line) {
+	gfxline_t*next = line->next;
+	if(line->type == gfx_moveTo && (line->next && line->next->type != gfx_moveTo)) {
+	    gfxpoint_t xy = {line->x, line->y};
+	    dict_put(ff, &xy, line);
+	    prev = line;
+	} else if(!line->next || line->next->type == gfx_moveTo) {
+	    if(prev) {
+		gfxpoint_t xy = {line->x, line->y};
+		dict_put(rev, &xy, prev);
+		line->next = 0;
+	    }
+	}
+	line = next;
+    }
+   
+    gfxpoint_t pos = {0,0};
+
+    gfxline_t*result = 0;
+    gfxline_t*last = 0;
+   
+    char first = 1;
+    while(dict_count(ff)) {
+	char reverse = 0, stitch = 1;
+	gfxline_t*l = dict_lookup(ff, &pos);
+	if(l) {
+	    char d = dict_del2(ff,&pos,l);assert(d);
+	} else {
+	    l = dict_lookup(rev, &pos);
+	    if(l) {
+		reverse = 1;
+		char d = dict_del2(rev,&pos,l);assert(d);
+	    }
+	}
+	if(!l) {
+	    /* try to find *any* entry. this is costly, but
+	       doesn't happen too often */
+	    stitch = 0;
+	    DICT_ITERATE_DATA(ff, gfxline_t*, l2) {
+		l = l2;
+		break;
+	    }
+	    assert(l);
+	    gfxpoint_t xy = {l->x,l->y};
+	    char d = dict_del2(ff,&xy,l);assert(d);
+	}
+	
+	gfxline_t*end = l;
+	if(!reverse) {
+	    while(end->next) end = end->next;
+	    pos.x = end->x;
+	    pos.y = end->y;
+	    char d = dict_del2(rev,&pos,l);assert(d);
+	} else {
+	    l = gfxline_reverse(l);
+	    pos.x = end->x;
+	    pos.y = end->y;
+	    char d = dict_del2(ff,&pos,end);assert(d);
+	}
+
+	assert(l->type == gfx_moveTo);
+	if(stitch && !first) {
+	    /* cut away the moveTo */
+	    gfxline_t*next = l->next;
+	    free(l);
+	    l = next;
+	}
+
+	if(!last) {
+	    result = l;
+	    last = end;
+	} else {
+	    last->next = l;
+	    last = end;
+	}
+	first = 0;
+    }
+    dict_destroy(ff);
+    dict_destroy(rev);
+    return result;
+}
+
+gfxline_t* gfxline_reverse(gfxline_t*line)
+{
+    gfxline_t*b = 0;
+    while(line) {
+	gfxline_t*next = line->next;
+	if(next && next->type != gfx_moveTo) {
+	    line->type = next->type;
+	    line->sx = next->sx;
+	    line->sy = next->sy;
+	} else {
+	    line->type = gfx_moveTo;
+	}
+	line->next = b;
+	b = line;
+	line = next;
+    }
+    return b;
+}
+
+void gfxgradient_destroy(gfxgradient_t*gradient)
+{
+    while(gradient) {
+	gfxgradient_t*next = gradient->next;
+	free(gradient);
+	gradient = next;
+    }
+}
+
+gfxparams_t* gfxparams_new()
+{
+    return (gfxparams_t*)rfx_calloc(sizeof(gfxparams_t));
+}
+
+void gfxparams_store(gfxparams_t*params, const char*key, const char*value)
+{
+    gfxparam_t*o = params->params;
+    while(o) {
+        if(!strcmp(key, o->key)) {
+            /* overwrite old value */
+            free((void*)o->value);
+            o->value = strdup(value);
+            return;
+        }
+        o = o->next;
+    }
+    gfxparam_t*p = (gfxparam_t*)malloc(sizeof(gfxparam_t));
+    p->key = strdup(key);
+    p->value = strdup(value);
+    p->next = 0;
+
+    if(params->last) {
+	params->last->next = p;
+	params->last = p;
+    } else {
+	params->params = p;
+	params->last = p;
+    }
+}
+
+void gfxparams_free(gfxparams_t*params)
+{
+    gfxparam_t*p = params->params;
+    while(p) {
+	gfxparam_t*next = p->next;
+	free((void*)p->key);
+	if(p->value) free((void*)p->value);
+	free(p);
+	p = next;
+    }
+    free(params);
+}
+