Changeset 1174Tweet

Timestamp:

Oct 1, 2006, 2:23:30 PM (15 years ago)

Author:

Sam Hocevar

Message:

• Better precision in cucul_fill_triangle().

File:

• libcaca/trunk/cucul/triangle.c (modified) (2 diffs)

libcaca/trunk/cucul/triangle.c

@@ -106 +106 @@
 
     /* Compute slopes and promote precision */
-    sl21 = (y2 == y1) ? 0 : (x2 - x1) * 0x1000 / (y2 - y1);
-    sl31 = (y3 == y1) ? 0 : (x3 - x1) * 0x1000 / (y3 - y1);
-    sl32 = (y3 == y2) ? 0 : (x3 - x2) * 0x1000 / (y3 - y2);
+    sl21 = (y2 == y1) ? 0 : (x2 - x1) * 0x10000 / (y2 - y1);
+    sl31 = (y3 == y1) ? 0 : (x3 - x1) * 0x10000 / (y3 - y1);
+    sl32 = (y3 == y2) ? 0 : (x3 - x2) * 0x10000 / (y3 - y2);
 
-    x1 *= 0x1000;
-    x2 *= 0x1000;
-    x3 *= 0x1000;
+    x1 *= 0x10000;
+    x2 *= 0x10000;
+    x3 *= 0x10000;
 
     ymin = y1 < 0 ? 0 : y1;
@@ -139 +139 @@
         if(xa < xb)
         {
-            xx1 = (xa + 0x800) / 0x1000;
-            xx2 = (xb + 0x801) / 0x1000;
+            xx1 = (xa + 0x800) / 0x10000;
+            xx2 = (xb + 0x801) / 0x10000;
         }
         else
         {
-            xx1 = (xb + 0x800) / 0x1000;
-            xx2 = (xa + 0x801) / 0x1000;
+            xx1 = (xb + 0x800) / 0x10000;
+            xx2 = (xa + 0x801) / 0x10000;
         }