Mu - 103grapheme.subx

https://github.com/akkartik/mu/blob/main/103grapheme.subx

  1 # Use the built-in font to draw a grapheme to real screen.
  2 #
  3 # We need to do this in machine code because Mu doesn't have global variables
  4 # yet (for the start of the font).
  5 #
  6 # There are uncomfortable assumptions baked in here about english/latin
  7 # script. We convert the grid of pixels into a fixed-width grid of graphemes,
  8 # which may not work well with other language families.
  9 
 10 == code
 11 
 12 # The Mu computer's screen is 1024px wide and 768px tall.
 13 # The Mu computer's font is 8px wide and 16px tall.
 14 # Therefore 'x' here is in [0, 128), and 'y' is in [0, 48)
 15 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ss="subxS1Comment"># . epilogue 185 89/<- %esp 5/r32/ebp 186 5d/pop-to-ebp 187 c3/return 188 189 # Not a real `show-cursor` primitive: 190 # - does not clear previous location cursor was shown at. 191 # - does not preserve what was at the cursor. Caller is responsible for 192 # tracking what was on the screen at this position before and passing it 193 # in again. 194 # - does not stop showing the cursor at this location when the cursor moves 195 draw-cursor-on-real-screen: # g: grapheme 196 # . prologue 197 55/push-ebp 198 89/<- %ebp 4/r32/esp 199 # . save registers 200 50/push-eax 201 51/push-ecx 202 # 203 (cursor-position-on-real-screen) # => eax, ecx 204 (draw-grapheme-on-real-screen *(ebp+8) %eax %ecx 0 7) 205 $draw-cursor-on-real-screen:end: 206 # . restore registers 207 59/pop-to-ecx 208 58/pop-to-eax 209 # . epilogue 210 89/<- %esp 5/r32/ebp 211 5d/pop-to-ebp 212 c3/return 213 214 == data 215 216 # The cursor is where certain Mu functions (usually of the form 217 # 'draw*cursor*') print to by default. 218 # 219 # We don't bother displaying the cursor when drawing. It only becomes visible 220 # on draw-cursor, which is quite rickety (see above) 221 # 222 # It's up to applications to manage cursor display: 223 # - clean up where it used to be 224 # - display the cursor before waiting for a key 225 # - ensure its location appropriately suggests the effect keystrokes will have 226 # - ensure its contents (and colors) appropriately reflect the state of the 227 # screen 228 # 229 # There's no blinking, etc. We aren't using any hardware-supported text mode 230 # here. 231 Real-screen-cursor-x: 232 0/imm32 233 Real-screen-cursor-y: 234 0/imm32