altos/draw: Add damage tracking

[fw/altos] / src / draw / ao_poly.c

diff --git a/src/draw/ao_poly.c b/src/draw/ao_poly.c
index a546e04341cc680392b192137d01efc09b8ee960..546f0db5ab71685d25490673862f15c0879d38fc 100644 (file)
--- a/src/draw/ao_poly.c
+++ b/src/draw/ao_poly.c
@@ -16,8 +16,8 @@
  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  */
 
-#include "ao_draw.h"
-#include "ao_draw_int.h"
+#include <ao_draw.h>
+#include <ao_draw_int.h>
 #include <stdio.h>
 #include <math.h>
 #include <float.h>
@@ -175,7 +175,7 @@ ao_wind(const struct ao_coord               *coords,
  * Fill the specified polygon with non-zero winding rule
  */
 void
-ao_poly(const struct ao_bitmap *dst,
+ao_poly(struct ao_bitmap               *dst,
        const struct ao_coord           *coords,
        uint16_t                        ncoords,
        const struct ao_transform       *transform,
@@ -183,6 +183,7 @@ ao_poly(const struct ao_bitmap      *dst,
        uint8_t                 rop)
 {
        float           y_min, y_max;
+       float           x_min, x_max;
        uint16_t        edge;
        float           y;
        float           x;
@@ -193,10 +194,16 @@ ao_poly(const struct ao_bitmap    *dst,
                transform = &ao_identity;
 
        /*
-        * Find the y limits of the polygon
+        * Find the limits of the polygon
         */
+       x_min = x_max = _x(coords, transform, 0);
        y_min = y_max = _y(coords, transform, 0);
        for (edge = 1; edge < ncoords; edge++) {
+               x = _x(coords, transform, edge);
+               if (x < x_min)
+                       x_min = x;
+               else if (x > x_max)
+                       x_max = x;
                y = _y(coords, transform, edge);
                if (y < y_min)
                        y_min = y;
@@ -204,12 +211,18 @@ ao_poly(const struct ao_bitmap    *dst,
                        y_max = y;
        }
 
+       x_min = floorf(x_min);
+       x_max = ceilf(x_max);
+       ao_clip(x_min, 0, dst->width);
+       ao_clip(x_max, 0, dst->width);
+
        y_min = floorf(y_min);
        y_max = ceilf(y_max);
-
        ao_clip(y_min, 0, dst->height);
        ao_clip(y_max, 0, dst->height);
 
+       ao_damage(dst, (int16_t) x_min, (int16_t) y_min, (int16_t) x_max, (int16_t) y_max);
+
        /*
         * Walk each scanline in the range and fill included spans
         */