1 files changed, 131 insertions, 0 deletions
diff --git a/third_party/spiro/ppedit/bezctx_libart.c b/third_party/spiro/ppedit/bezctx_libart.c
new file mode 100644
index 0000000..c6b268f
--- /dev/null
+++ b/third_party/spiro/ppedit/bezctx_libart.c
@@ -0,0 +1,131 @@
+/*
+ppedit - A pattern plate editor for Spiro splines.
+Copyright (C) 2007 Raph Levien
+
+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 the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA.
+
+*/
+#include <libart_lgpl/libart.h>
+#include "zmisc.h"
+#include "bezctx.h"
+#include "bezctx_libart.h"
+
+typedef struct {
+    bezctx base;
+    int n_bez;
+    int n_bez_max;
+    ArtBpath *bez;
+} bezctx_libart;
+
+static void
+bezctx_libart_moveto(bezctx *z, double x, double y, int is_open) {
+    bezctx_libart *bc = (bezctx_libart *)z;
+    ArtBpath *bp;
+
+    if (bc->n_bez == bc->n_bez_max) {
+	bc->bez = zrenew(ArtBpath, bc->bez, bc->n_bez_max <<= 1);
+    }
+    bp = &bc->bez[bc->n_bez++];
+    bp->code = is_open ? ART_MOVETO_OPEN : ART_MOVETO;
+    bp->x3 = x;
+    bp->y3 = y;
+}
+
+void
+bezctx_libart_lineto(bezctx *z, double x, double y) {
+    bezctx_libart *bc = (bezctx_libart *)z;
+    ArtBpath *bp;
+
+    if (bc->n_bez == bc->n_bez_max) {
+	bc->bez = zrenew(ArtBpath, bc->bez, bc->n_bez_max <<= 1);
+    }
+    bp = &bc->bez[bc->n_bez++];
+    bp->code = ART_LINETO;
+    bp->x3 = x;
+    bp->y3 = y;
+}
+
+void
+bezctx_libart_quadto(bezctx *z, double x1, double y1, double x2, double y2)
+{
+    bezctx_libart *bc = (bezctx_libart *)z;
+    ArtBpath *bp;
+    double x0, y0;
+
+    if (bc->n_bez == bc->n_bez_max) {
+	bc->bez = zrenew(ArtBpath, bc->bez, bc->n_bez_max <<= 1);
+    }
+    bp = &bc->bez[bc->n_bez++];
+    x0 = bp[-1].x3;
+    y0 = bp[-1].y3;
+    bp->code = ART_CURVETO;
+    bp->x1 = x1 + (1./3) * (x0 - x1);
+    bp->y1 = y1 + (1./3) * (y0 - y1);
+    bp->x2 = x1 + (1./3) * (x2 - x1);
+    bp->y2 = y1 + (1./3) * (y2 - y1);
+    bp->x3 = x2;
+    bp->y3 = y2;
+}
+
+void
+bezctx_libart_curveto(bezctx *z, double x1, double y1, double x2, double y2,
+		      double x3, double y3)
+{
+    bezctx_libart *bc = (bezctx_libart *)z;
+    ArtBpath *bp;
+
+    if (bc->n_bez == bc->n_bez_max) {
+	bc->bez = zrenew(ArtBpath, bc->bez, bc->n_bez_max <<= 1);
+    }
+    bp = &bc->bez[bc->n_bez++];
+    bp->code = ART_CURVETO;
+    bp->x1 = x1;
+    bp->y1 = y1;
+    bp->x2 = x2;
+    bp->y2 = y2;
+    bp->x3 = x3;
+    bp->y3 = y3;
+}
+
+ArtBpath *
+bezctx_to_bpath(bezctx *z) {
+    bezctx_libart *bc = (bezctx_libart *)z;
+    ArtBpath *result;
+
+    if (bc->n_bez == bc->n_bez_max) {
+	bc->bez = zrenew(ArtBpath, bc->bez, bc->n_bez_max <<= 1);
+    }
+    bc->bez[bc->n_bez].code = ART_END;
+    result = bc->bez;
+    zfree(bc);
+    return result;
+}
+
+bezctx *
+new_bezctx_libart(void) {
+    bezctx_libart *result = znew(bezctx_libart, 1);
+
+    result->base.moveto = bezctx_libart_moveto;
+    result->base.lineto = bezctx_libart_lineto;
+    result->base.quadto = bezctx_libart_quadto;
+    result->base.curveto = bezctx_libart_curveto;
+    result->base.mark_knot = NULL;
+    result->n_bez = 0;
+    result->n_bez_max = 4;
+    result->bez = znew(ArtBpath, result->n_bez_max);
+    return &result->base;
+}
+