X-Git-Url: http://git.asbjorn.biz/?p=swftools.git;a=blobdiff_plain;f=lib%2Fgfxpoly%2Fconvert.c;h=f67699ed76458dee9ece58437b59dfe06c39ad8a;hp=64cef43fa3bdf47b41552ff616a3f1c60b24bdd2;hb=2391d7ae5d8a145a250a8b80ab8c93ba74eba030;hpb=3c6c2c2a98a273483285119b9cc0b782aa8a79c8

diff --git a/lib/gfxpoly/convert.c b/lib/gfxpoly/convert.c
index 64cef43..f67699e 100644
--- a/lib/gfxpoly/convert.c
+++ b/lib/gfxpoly/convert.c
@@ -12,12 +12,13 @@
 
 static inline int32_t convert_coord(double x, double z)
 {
-    /* we clamp to 31 bit instead of 32 bit because we use
-       a (x1-x2) shortcut when comparing coordinates
+    /* we clamp to 26 bit because: 
+       a) we use a (x1-x2) shortcut when comparing coordinates
+       b) we need to be able to multiply two coordinates and store them in a double w/o loss of precision
     */
     x *= z;
-    if(x < -0x40000000) x = -0x40000000;
-    if(x >  0x3fffffff) x =  0x3fffffff;
+    if(x < -0x2000000) x = -0x2000000;
+    if(x >  0x1ffffff) x =  0x1ffffff;
     return ceil(x);
 }
 
@@ -91,7 +92,7 @@ static void convert_file(const char*filename, polywriter_t*w, double gridsize)
             break;
         double x,y;
         char s[256];
-        if(sscanf(line, "%lf %lf %s", &x, &y, &s) == 3) {
+        if(sscanf(line, "%lf %lf %s", &x, &y, (char*)&s) == 3) {
             if(s && !strcmp(s,"moveto")) {
 		w->moveto(w, convert_coord(x,z), convert_coord(y,z));
                 count++;
@@ -174,9 +175,8 @@ static void compactlineto(polywriter_t*w, int32_t x, int32_t y)
     if(p.x == data->last.x && p.y == data->last.y)
 	return;
 
-    if(p.y < data->last.y && data->dir != DIR_UP ||
-       p.y > data->last.y && data->dir != DIR_DOWN || 
-       data->new) {
+    if((p.y < data->last.y && data->dir != DIR_UP) ||
+       (p.y > data->last.y && data->dir != DIR_DOWN) || data->new) {
 	finish_segment(data);
 	data->dir = p.y > data->last.y ? DIR_DOWN : DIR_UP;
 	data->points[0] = data->last;
@@ -406,7 +406,7 @@ gfxline_t*gfxline_from_gfxpoly(gfxpoly_t*poly)
 }
 #endif
 
-gfxline_t*gfxline_from_gfxpoly(gfxpoly_t*poly)
+static gfxline_t*mkgfxline(gfxpoly_t*poly, char preserve_direction)
 {
     gfxpolystroke_t*stroke;
     int count = 0;
@@ -415,6 +415,7 @@ gfxline_t*gfxline_from_gfxpoly(gfxpoly_t*poly)
     dict_t*d = dict_new2(&point_type);
     dict_t*todo = dict_new2(&ptr_type);
     gfxpolystroke_t*stroke_min= poly->strokes;
+    int32_t x_min=stroke_min->points[0].x;
     int32_t y_min=stroke_min->points[0].y;
     for(stroke=poly->strokes;stroke;stroke=stroke->next) {
 	dict_put(todo, stroke, stroke);
@@ -422,10 +423,15 @@ gfxline_t*gfxline_from_gfxpoly(gfxpoly_t*poly)
 	count += stroke->num_points;
 	if(stroke->dir == DIR_UP) {
 	    dict_put(d, &stroke->points[stroke->num_points-1], stroke);
+	    if(!preserve_direction)
+		dict_put(d, &stroke->points[0], stroke);
 	} else {
 	    dict_put(d, &stroke->points[0], stroke);
+	    if(!preserve_direction)
+		dict_put(d, &stroke->points[stroke->num_points-1], stroke);
 	}
-	if(stroke->points[0].y < y_min) {
+	if(stroke->points[0].y < y_min ||
+	   (stroke->points[0].y == y_min && stroke->points[0].x < x_min)) {
 	    y_min = stroke->points[0].y;
 	    stroke_min = stroke;
 	}
@@ -438,13 +444,28 @@ gfxline_t*gfxline_from_gfxpoly(gfxpoly_t*poly)
     point_t last = {INVALID_COORD, INVALID_COORD};
     char should_connect = 0;
     while(stroke) {
+	if(stroke && !preserve_direction) {
+	    char del1 = dict_del2(d, &stroke->points[0], stroke);
+	    char del2 = dict_del2(d, &stroke->points[stroke->num_points-1], stroke);
+	    assert(del1 && del2);
+	}
 	assert(dict_contains(todo, stroke));
 	int t;
 	int pos = 0;
 	int incr = 1;
-	if(stroke->dir == DIR_UP) {
-	    pos = stroke->num_points-1;
-	    incr = -1;
+	if(preserve_direction) {
+	    if(stroke->dir == DIR_UP) {
+		pos = stroke->num_points-1;
+		incr = -1;
+	    }
+	} else {
+	    // try to find matching point on either end.
+	    // Prefer downward.
+	    if(last.x == stroke->points[stroke->num_points-1].x &&
+	       last.y == stroke->points[stroke->num_points-1].y) {
+		pos = stroke->num_points-1;
+		incr = -1;
+	    }
 	}
 	if(last.x != stroke->points[pos].x || last.y != stroke->points[pos].y) {
 	    l[count].x = stroke->points[pos].x * poly->gridsize;
@@ -487,6 +508,16 @@ gfxline_t*gfxline_from_gfxpoly(gfxpoly_t*poly)
     return l;
 }
 
+gfxline_t*gfxline_from_gfxpoly(gfxpoly_t*poly)
+{
+    return mkgfxline(poly, 0);
+}
+
+gfxline_t*gfxline_from_gfxpoly_updown(gfxpoly_t*poly)
+{
+    return mkgfxline(poly, 1);
+}
+
 static windcontext_t onepolygon = {1};
 gfxline_t* gfxpoly_circular_to_evenodd(gfxline_t*line, double gridsize)
 {