Changeset 74d1d66 in mainline

Timestamp:

2006-05-13T17:20:27Z (19 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

2666daa

Parents:

e459f12

Message:

Forgotten in last commit… improve frame buffer speed by buffering blank line.

File:

• genarch/src/fb/fb.c (modified) (3 diffs)

genarch/src/fb/fb.c

@@ -31 +31 @@
 #include <console/chardev.h>
 #include <console/console.h>
+#include <mm/slab.h>
 #include <panic.h>
 #include <memstr.h>
+#include <config.h>
 
 #include "helenos.xbm"
@@ -39 +41 @@
 
 static __u8 *fbaddress = NULL;
+
+static __u8 *blankline = NULL;
 
 static unsigned int xres = 0;
@@ -160 +164 @@
 {
         unsigned int i;
+        __u8 *lastline = &fbaddress[(rows - 1) * ROW_BYTES];
 
         memcpy((void *) fbaddress, (void *) &fbaddress[ROW_BYTES], scanline * yres - ROW_BYTES);
 
         /* Clear last row */
-        for (i = 0; i < FONT_SCANLINES; i++)
-                clear_line((rows - 1) * FONT_SCANLINES + i);
+        if (blankline) {
+                memcpy((void *) lastline, (void *) blankline, ROW_BYTES);
+        } else {
+                for (i = 0; i < FONT_SCANLINES; i++)
+                        clear_line((rows - 1) * FONT_SCANLINES + i);
+
+                if (config.mm_initialized) {
+                        /* Save a blank line aside. */
+                        blankline = (__u8 *) malloc(ROW_BYTES, FRAME_ATOMIC);
+                        if (blankline)
+                                memcpy((void *) blankline, (void *) lastline, ROW_BYTES);
+                }
+        }
 }