Revision: 4012
http://vexi.svn.sourceforge.net/vexi/?rev=4012&view=rev
Author: clrg
Date: 2011-01-31 16:35:30 +0000 (Mon, 31 Jan 2011)
Log Message:
-----------
Only blit once per render cycle -> faster rendering again
Modified Paths:
--------------
trunk/org.vexi-core.main/src/main/java/org/vexi/core/Surface.java
Modified: trunk/org.vexi-core.main/src/main/java/org/vexi/core/Surface.java
===================================================================
--- trunk/org.vexi-core.main/src/main/java/org/vexi/core/Surface.java
2011-01-31 14:40:02 UTC (rev 4011)
+++ trunk/org.vexi-core.main/src/main/java/org/vexi/core/Surface.java
2011-01-31 16:35:30 UTC (rev 4012)
@@ -810,25 +810,54 @@
}
final int rwidth = root.width;
final int rheight = root.height;
+ // REMARK: whilst in theory only blitting the dirty areas
+ // would seem more efficient, in practise it results in a
+ // large slowdown due to a delay in processing each blit,
+ // so instead we just blit a single area covering all the
+ // dirty parts (NB: original implementation below)
+ int x = root.width;
+ int y = root.height;
+ int w = 0;
+ int h = 0;
for (int i = 0; i < numregions; i++) {
// consumed dirty areas are marked with a -1
if (dirt[4*i]<0) {
continue;
}
// handle confirmed dirty areas
- int x = dirt[4*i];
- int y = dirt[4*i+1];
- int w = dirt[4*i+2];
- int h = dirt[4*i+3];
- if (x < 0) x = 0;
- if (y < 0) y = 0;
- if (w > rwidth) w = rwidth;
- if (h > rheight) h = rheight;
- if (w <= x || h <= y) {
- continue;
- }
- blit(backbuffer, x, y, x, y, w, h);
+ x = Math.min(x, dirt[4*i]);
+ y = Math.min(y, dirt[4*i+1]);
+ w = Math.max(w, dirt[4*i+2]);
+ h = Math.max(h, dirt[4*i+3]);
}
+ if (x < 0) x = 0;
+ if (y < 0) y = 0;
+ if (w > rwidth) w = rwidth;
+ if (h > rheight) h = rheight;
+ if (w <= x || h <= y) {
+ return;
+ }
+ blit(backbuffer, x, y, x, y, w, h);
+ // REMARK: the old way
+// for (int i = 0; i < numregions; i++) {
+// // consumed dirty areas are marked with a -1
+// if (dirt[4*i]<0) {
+// continue;
+// }
+// // handle confirmed dirty areas
+// int x = dirt[4*i];
+// int y = dirt[4*i+1];
+// int w = dirt[4*i+2];
+// int h = dirt[4*i+3];
+// if (x < 0) x = 0;
+// if (y < 0) y = 0;
+// if (w > rwidth) w = rwidth;
+// if (h > rheight) h = rheight;
+// if (w <= x || h <= y) {
+// continue;
+// }
+// blit(backbuffer, x, y, x, y, w, h);
+// }
}
/** This is how subclasses signal a 'shallow dirty', indicating that
although the backbuffer is valid, the screen is not */
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