m2_vwf.print_string now returns number of pixels rendered

2017-03-25 20:13:54 -04:00 · 2017-03-25 20:13:54 -04:00 · fb0b7e72c8
parent 9762910926
commit fb0b7e72c8
1 changed files with 5 additions and 2 deletions
--- a/m2-vwf.asm
+++ b/m2-vwf.asm
@ -95,13 +95,15 @@ pop     {r0-r5,pc}
 //    r2: y (pixel)
 // Out:
 //    r0: number of characters printed
+//    r1: number of pixels printed
 //=============================================================================

 .print_string:
-push    {r1-r5,lr}
+push    {r2-r6,lr}

 mov     r3,#0
 mov     r5,r3
+mov     r6,r1
 mov     r4,r0
 -
 ldrb    r0,[r4,#1]
@ -117,7 +119,8 @@ b       -

 .print_string_end:
 mov     r0,r5
-pop     {r1-r5,pc}
+sub     r1,r1,r6
+pop     {r2-r6,pc}


 //=============================================================================