emit func

1 files changed, 17 insertions, 12 deletions

diff --git a/poly3.c b/poly3.c
index d8802d9..01a4ada 100644
--- a/poly3.c
+++ b/poly3.c
@@ -4,6 +4,7 @@
 #include <stdint.h>
 #include <string.h>
 #include <assert.h>
+#include <cairo.h>
 
 typedef int32_t			fixed_t;
 
@@ -460,17 +461,12 @@ update_active (active_t *active, sample_t yi)
     return active;
 }
 
-static void
-emit (sample_t xi, sample_t yi)
-{
-    printf ("(%8x, %8x)  =>   (%f, %f)\n",
-	    xi, yi,
-	    fixed_to_double (sample_to_pos_x (xi)),
-	    fixed_to_double (sample_to_pos_y (yi)));
-}
+typedef void (* emit_func_t) (sample_t xi, sample_t yi, void *data);
 
 static void
-polygon_rasterize (polygon_t *polygon, int x, int y, int width, int height)
+polygon_rasterize (polygon_t *polygon,
+		   int x, int y, int width, int height,
+		   emit_func_t emit, void *data)
 {
     global_t *global = create_global (polygon, x, y, width, height);
     active_t *active = create_active (global);
@@ -489,7 +485,7 @@ polygon_rasterize (polygon_t *polygon, int x, int y, int width, int height)
 	    {
 		edge_t *edge = active->edges[j];
 		
-		emit (edge->common.xi, yi);
+		emit (edge->common.xi, yi, data);
 		
 		edge_small_step (edge);
 	    }
@@ -504,7 +500,7 @@ polygon_rasterize (polygon_t *polygon, int x, int y, int width, int height)
 	{
 	    edge_t *edge = active->edges[j];
 
-	    emit (edge->common.xi, yi);
+	    emit (edge->common.xi, yi, data);
 	    
 	    edge_big_step (edge);
 	}
@@ -515,6 +511,15 @@ polygon_rasterize (polygon_t *polygon, int x, int y, int width, int height)
 
 #define df(a) double_to_fixed(a)
 
+static void
+emit (sample_t xi, sample_t yi, void *data)
+{
+    printf ("(%8x, %8x)  =>   (%f, %f)\n",
+	    xi, yi,
+	    fixed_to_double (sample_to_pos_x (xi)),
+	    fixed_to_double (sample_to_pos_y (yi)));
+}
+
 int
 main (int argc, char **argv)
 {
@@ -535,7 +540,7 @@ main (int argc, char **argv)
     polygon_t *polygon = polygon_create (
 	pentagons, sizeof (pentagons) / sizeof (pentagons[0]));
 
-    polygon_rasterize (polygon, 0, 0, 45, 30);
+    polygon_rasterize (polygon, 0, 0, 45, 30, emit, NULL);
     
     return 0;
 }