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| author | Kartik Agaram <vc@akkartik.com> | 2021-01-12 23:52:24 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2021-01-12 23:52:24 -0800 |
| commit | 4413168269ad3d3f31fdc60669bb812f54a3d01e (patch) | |
| tree | b9b3c6e7b0852b332f6facf3e8501b44d7dc4050 /baremetal/103grapheme.subx | |
| parent | 8a81faecbe3c4bb2dbcbfc427f694b7932a1c5e5 (diff) | |
| download | mu-4413168269ad3d3f31fdc60669bb812f54a3d01e.tar.gz | |
7507 - baremetal: drawing text down then right
Diffstat (limited to 'baremetal/103grapheme.subx')
| -rw-r--r-- | baremetal/103grapheme.subx | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/baremetal/103grapheme.subx b/baremetal/103grapheme.subx index 934aac51..053cd497 100644 --- a/baremetal/103grapheme.subx +++ b/baremetal/103grapheme.subx @@ -8,6 +8,7 @@ draw-grapheme: # screen: (addr screen), g: grapheme, x: int, y: int, color: int 52/push-edx 53/push-ebx 56/push-esi + # TODO: support fake screen; we currently assume 'screen' is always 0 (real) # var letter-bitmap/esi = font[g] 8b/-> *(ebp+0xc) 6/r32/esi c1 4/subop/shift-left %esi 4/imm8 @@ -57,6 +58,12 @@ 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 @@ -68,3 +75,24 @@ $draw-grapheme:end: 89/<- %esp 5/r32/ebp 5d/pop-to-ebp c3/return + +cursor-position: # screen: (addr screen) -> _/eax: int, _/ecx: int + # . prologue + 55/push-ebp + 89/<- %ebp 4/r32/esp + # TODO: support fake screen; we currently assume 'screen' is always 0 (real) + 8b/-> *Default-next-x 0/r32/eax + 8b/-> *Default-next-y 1/r32/ecx +$cursor-position:end: + # . epilogue + 89/<- %esp 5/r32/ebp + 5d/pop-to-ebp + c3/return + +== data + +Default-next-x: + 0/imm32 + +Default-next-y: + 0/imm32 |