+#include "../../config.h"
+#include "../rfxswf.h"
+#include "../gfxdevice.h"
+#include "../gfxtools.h"
+#include "../art/libart.h"
+#include "artsutils.h"
#include <assert.h>
#include <math.h>
-static ArtVpath* gfxline_to_ArtVpath(gfxline_t*line)
+ArtVpath* gfxline_to_ArtVpath(gfxline_t*line)
{
ArtVpath *vec = NULL;
int pos=0,len=0;
} else if(l2->type == gfx_splineTo) {
int i;
int parts = (int)(sqrt(fabs(l2->x-2*l2->sx+x) + fabs(l2->y-2*l2->sy+y))*subfraction);
- if(!parts) parts = 1;
+ double stepsize = parts?1.0/parts:0;
for(i=0;i<=parts;i++) {
- double t = (double)i/(double)parts;
+ double t = (double)i*stepsize;
vec[pos].code = ART_LINETO;
vec[pos].x = l2->x*t*t + 2*l2->sx*t*(1-t) + x*(1-t)*(1-t);
vec[pos].y = l2->y*t*t + 2*l2->sy*t*(1-t) + y*(1-t)*(1-t);
l2 = l2->next;
}
vec[pos].code = ART_END;
+
+ /* fix "dotted" lines */
+ int t;
+ char linepending=0;
+ for(t=0;vec[t].code!=ART_END;t++) {
+ if(t>0 && vec[t-1].code==ART_MOVETO && vec[t].code==ART_LINETO
+ && vec[t+1].code!=ART_LINETO
+ && vec[t-1].x == vec[t].x
+ && vec[t-1].y == vec[t].y) {
+ vec[t].x += 0.01;
+ }
+ if(vec[t].code==ART_MOVETO)
+ linepending=0;
+ x = vec[t].x;
+ y = vec[t].y;
+ }
+
+ // Spot adjacent identical points
+ t = 1;
+ while(t < pos)
+ {
+ if ((vec[t-1].x == vec[t].x) && (vec[t-1].y == vec[t].y)) {
+ // adjacent identical points; remove one
+ memcpy(&(vec[t]), &(vec[t + 1]), sizeof(vec[t]) * (pos - t));
+ pos--;
+ } else {
+ t++;
+ }
+ }
+
+ /* adjacency remover disabled for now, pending code inspection */
+ return vec;
+
+ // Check for further non-adjacent identical points. We don't want any
+ // points other than the first and last points to exactly match.
+ //
+ // If we do find matching points, move the second point slightly. This
+ // currently moves the duplicate 2% towards the midpoint of its neighbours
+ // (easier to calculate than 2% down the perpendicular to the line joining
+ // the neighbours) but limiting the change to 0.1 twips to avoid visual
+ // problems when the shapes are large. Note that there is no minimum
+ // change: if the neighbouring points are colinear and equally spaced,
+ // e.g. they were generated as part of a straight spline, then the
+ // duplicate point may not actually move.
+ //
+ // The scan for duplicates algorithm is quadratic in the number of points:
+ // there's probably a better method but the numbers of points is generally
+ // small so this will do for now.
+ {
+ int i = 1, j;
+ for(; i < (pos - 1); ++i)
+ {
+ for (j = 0; j < i; ++j)
+ {
+ if ((vec[i].x == vec[j].x)
+ && (vec[i].y == vec[j].y))
+ {
+ // points match; shuffle point
+ double dx = (vec[i-1].x + vec[i+1].x - (vec[i].x * 2.0)) / 100.0;
+ double dy = (vec[i-1].y + vec[i+1].y - (vec[i].y * 2.0)) / 100.0;
+ double dxxyy = (dx*dx) + (dy*dy);
+ if (dxxyy > 0.01)
+ {
+ // This is more than 0.1 twip's distance; scale down
+ double dscale = sqrt(dxxyy) * 10.0;
+ dx /= dscale;
+ dy /= dscale;
+ };
+ vec[i].x += dx;
+ vec[i].y += dy;
+ break;
+ }
+ }
+ }
+ }
return vec;
}
-static void show_path(ArtSVP*path)
+void show_path(ArtSVP*path)
{
int t;
printf("Segments: %d\n", path->n_segs);
printf("\n");
}
-static ArtSVP* gfxfillToSVP(gfxline_t*line, int perturb)
+ArtSVP* gfxfillToSVP(gfxline_t*line, int perturb)
{
ArtVpath* vec = gfxline_to_ArtVpath(line);
if(perturb) {
}
ArtSVP *svp = art_svp_from_vpath(vec);
free(vec);
+
+ // We need to make sure that the SVP we now have bounds an area (i.e. the
+ // source line wound anticlockwise) rather than excludes an area (i.e. the
+ // line wound clockwise). It seems that PDF (or xpdf) is less strict about
+ // this for bitmaps than it is for fill areas.
+ //
+ // To check this, we'll sum the cross products of all pairs of adjacent
+ // lines. If the result is positive, the direction is correct; if not, we
+ // need to reverse the sense of the SVP generated. The easiest way to do
+ // this is to flip the up/down flags of all the segments.
+ //
+ // This is approximate; since the gfxline_t structure can contain any
+ // combination of moveTo, lineTo and splineTo in any order, not all pairs
+ // of lines in the shape that share a point need be described next to each
+ // other in the sequence. For ease, we'll consider only pairs of lines
+ // stored as lineTos and splineTos without intervening moveTos.
+ //
+ // TODO is this a valid algorithm? My vector maths is rusty.
+ //
+ // It may be more correct to instead reverse the line before we feed it
+ // into gfxfilltoSVP. However, this seems equivalent and is easier to
+ // implement!
+ double total_cross_product = 0.0;
+ gfxline_t* cursor = line;
+ if (cursor != NULL)
+ {
+ double x_last = cursor->x;
+ double y_last = cursor->y;
+ cursor = cursor->next;
+
+ while((cursor != NULL) && (cursor->next != NULL))
+ {
+ if (((cursor->type == gfx_lineTo) || (cursor->type == gfx_splineTo))
+ && ((cursor->next->type == gfx_lineTo) || (cursor->next->type == gfx_splineTo)))
+ {
+ // Process these lines
+ //
+ // In this space (x right, y down) the cross-product is
+ // (x1 * y0) - (x0 * y1)
+ double x0 = cursor->x - x_last;
+ double y0 = cursor->y - y_last;
+ double x1 = cursor->next->x - cursor->x;
+ double y1 = cursor->next->y - cursor->y;
+ total_cross_product += (x1 * y0) - (x0 * y1);
+ }
+
+ x_last = cursor->x;
+ y_last = cursor->y;
+ cursor = cursor->next;
+ }
+ }
+ if (total_cross_product < 0.0)
+ {
+ int i = 0;
+ for(; i < svp->n_segs; ++i)
+ {
+ if (svp->segs[i].dir != 0)
+ svp->segs[i].dir = 0;
+ else
+ svp->segs[i].dir = 1;
+ }
+ }
return svp;
}
-static ArtSVP* boxToSVP(double x1, double y1,double x2, double y2)
+ArtSVP* boxToSVP(double x1, double y1,double x2, double y2)
{
ArtVpath *vec = art_new (ArtVpath, 5+1);
vec[0].code = ART_MOVETO;
return svp;
}
-static ArtSVP* gfxstrokeToSVP(gfxline_t*line, gfxcoord_t width, gfx_capType cap_style, gfx_joinType joint_style, double miterLimit)
+ArtSVP* gfxstrokeToSVP(gfxline_t*line, gfxcoord_t width, gfx_capType cap_style, gfx_joinType joint_style, double miterLimit)
{
ArtVpath* vec = gfxline_to_ArtVpath(line);
+
ArtSVP *svp = art_svp_vpath_stroke (vec,
(joint_style==gfx_joinMiter)?ART_PATH_STROKE_JOIN_MITER:
((joint_style==gfx_joinRound)?ART_PATH_STROKE_JOIN_ROUND:
return svp;
}
-static gfxline_t* SVPtogfxline(ArtSVP*svp)
+gfxline_t* SVPtogfxline(ArtSVP*svp)
{
int size = 0;
int t;
return 0;
}
}
-
git.asbjorn.biz / swftools.git / blobdiff