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| author | Kartik Agaram <vc@akkartik.com> | 2021-01-13 00:02:35 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2021-01-13 00:02:35 -0800 |
| commit | 422ebaf88c5a04900beb0a68162213ebc94e37c2 (patch) | |
| tree | f6cffe2276da0a73c9d00716546c7b776586dee5 /baremetal/103grapheme.subx | |
| parent | 4413168269ad3d3f31fdc60669bb812f54a3d01e (diff) | |
| download | mu-422ebaf88c5a04900beb0a68162213ebc94e37c2.tar.gz | |
7508
This is the right way to be direction-independent. Don't save the cursor when drawing a single grapheme. Where the next char goes is just a property of the direction-oriented primitives.
Diffstat (limited to 'baremetal/103grapheme.subx')
| -rw-r--r-- | baremetal/103grapheme.subx | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/baremetal/103grapheme.subx b/baremetal/103grapheme.subx index 053cd497..a536bfed 100644 --- a/baremetal/103grapheme.subx +++ b/baremetal/103grapheme.subx @@ -58,12 +58,6 @@ draw-grapheme: # screen: (addr screen), g: grapheme, x: int, y: int, color: int # eb/jump loop/disp8 } - # Save default coordinates for a future call to draw-grapheme - 8b/-> *(ebp+0x10) 0/r32/eax - 81 0/subop/add %eax 8/imm32 - 89/<- *Default-next-x 0/r32/eax - 8b/-> *(ebp+0x14) 0/r32/eax - 89/<- *Default-next-y 0/r32/eax $draw-grapheme:end: # . restore registers 5e/pop-to-esi @@ -89,6 +83,25 @@ $cursor-position:end: 5d/pop-to-ebp c3/return +set-cursor-position: # screen: (addr screen), x: int, y: int + # . prologue + 55/push-ebp + 89/<- %ebp 4/r32/esp + # . save registers + 50/push-eax + # TODO: support fake screen; we currently assume 'screen' is always 0 (real) + 8b/-> *(ebp+0xc) 0/r32/eax + 89/<- *Default-next-x 0/r32/eax + 8b/-> *(ebp+0x10) 0/r32/eax + 89/<- *Default-next-y 0/r32/eax +$set-cursor-position:end: + # . restore registers + 58/pop-to-eax + # . epilogue + 89/<- %esp 5/r32/ebp + 5d/pop-to-ebp + c3/return + == data Default-next-x: |