mirror of
https://github.com/cc65/cc65.git
synced 2024-11-06 15:06:07 +00:00
8ecdf9d6b7
Rename tgi_setup to tgi_install. Make tgi_install and tgi_deinstall user callable. More cosmetic changes. git-svn-id: svn://svn.cc65.org/cc65/trunk@1966 b7a2c559-68d2-44c3-8de9-860c34a00d81
42 lines
870 B
ArmAsm
42 lines
870 B
ArmAsm
;
|
|
; Ullrich von Bassewitz, 22.06.2002
|
|
;
|
|
; Helper function for getpixel/setpixel. Load X/Y from stack and check if
|
|
; the coordinates are valid. Return carry clear if so.
|
|
;
|
|
|
|
.include "tgi-kernel.inc"
|
|
|
|
.import popax
|
|
.importzp ptr1, ptr2
|
|
|
|
|
|
.proc tgi_getset
|
|
|
|
jsr tgi_popxy ; Pop X/Y into ptr1/ptr2
|
|
|
|
; Are the coordinates out of range? First check if any coord is negative.
|
|
|
|
txa
|
|
ora ptr2+1
|
|
bmi @L9 ; Bail out if negative
|
|
|
|
; Check if X is larger than the maximum x coord. If so, bail out
|
|
|
|
lda ptr1
|
|
cmp _tgi_xres
|
|
txa
|
|
sbc _tgi_xres+1
|
|
bcs @L9
|
|
|
|
; Check if Y is larger than the maximum y coord.
|
|
|
|
lda ptr2
|
|
cmp _tgi_yres
|
|
lda ptr2+1
|
|
sbc _tgi_yres+1
|
|
@L9: rts
|
|
|
|
.endproc
|
|
|