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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/103grapheme.subx</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
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+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.subxComment { color: #005faf; }
+.LineNr { }
+.subxS1Comment { color: #0000af; }
+.subxFunction { color: #af5f00; text-decoration: underline; }
+.Constant { color: #008787; }
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+<!--
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+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
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+  var lineNum;
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+  lineNum = lineNum.substr(1); /* strip off '#' */
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+    lineNum = 'L'+lineNum;
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+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
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+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/103grapheme.subx'>https://github.com/akkartik/mu/blob/main/baremetal/103grapheme.subx</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="subxFunction">draw-grapheme</span>:  <span class="subxComment"># screen: (addr screen), g: grapheme, x: int, y: int, color: int</span>
+<span id="L2" class="LineNr"> 2 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L3" class="LineNr"> 3 </span>    55/push-ebp
+<span id="L4" class="LineNr"> 4 </span>    89/&lt;- %ebp 4/r32/esp
+<span id="L5" class="LineNr"> 5 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L6" class="LineNr"> 6 </span>    50/push-eax
+<span id="L7" class="LineNr"> 7 </span>    51/push-ecx
+<span id="L8" class="LineNr"> 8 </span>    52/push-edx
+<span id="L9" class="LineNr"> 9 </span>    53/push-ebx
+<span id="L10" class="LineNr">10 </span>    56/push-esi
+<span id="L11" class="LineNr">11 </span>    <span class="subxComment"># var letter-bitmap/esi = font[g]</span>
+<span id="L12" class="LineNr">12 </span>    8b/-&gt; *(ebp+0xc) 6/r32/esi
+<span id="L13" class="LineNr">13 </span>    c1 4/subop/shift-left %esi 4/imm8
+<span id="L14" class="LineNr">14 </span>    8d/copy-address *(esi+0x8800) 6/r32/esi  <span class="subxComment"># font-start</span>
+<span id="L15" class="LineNr">15 </span>    <span class="subxComment"># if (letter-bitmap &gt;= 0x9000) return  # characters beyond ASCII currently not supported</span>
+<span id="L16" class="LineNr">16 </span>    81 7/subop/compare %esi 0x9000/imm32
+<span id="L17" class="LineNr">17 </span>    7d/jump-if-&gt;= $draw-grapheme:end/disp8
+<span id="L18" class="LineNr">18 </span>    <span class="subxComment"># edx = y</span>
+<span id="L19" class="LineNr">19 </span>    8b/-&gt; *(ebp+0x14) 2/r32/edx
+<span id="L20" class="LineNr">20 </span>    <span class="subxComment"># var ymax/ebx: int = y + 16</span>
+<span id="L21" class="LineNr">21 </span>    8b/-&gt; *(ebp+0x14) 3/r32/ebx
+<span id="L22" class="LineNr">22 </span>    81 0/subop/add %ebx 0x10/imm32
+<span id="L23" class="LineNr">23 </span>    {
+<span id="L24" class="LineNr">24 </span>      <span class="subxComment"># if (y &gt;= ymax) break</span>
+<span id="L25" class="LineNr">25 </span>      39/compare %edx 3/r32/ebx
+<span id="L26" class="LineNr">26 </span>      7d/jump-if-&gt;= <span class="Constant">break</span>/disp8
+<span id="L27" class="LineNr">27 </span>      <span class="subxComment"># eax = x + 7</span>
+<span id="L28" class="LineNr">28 </span>      8b/-&gt; *(ebp+0x10) 0/r32/eax
+<span id="L29" class="LineNr">29 </span>      81 0/subop/add %eax 7/imm32
+<span id="L30" class="LineNr">30 </span>      <span class="subxComment"># var xmin/ecx: int = x</span>
+<span id="L31" class="LineNr">31 </span>      8b/-&gt; *(ebp+0x10) 1/r32/ecx
+<span id="L32" class="LineNr">32 </span>      <span class="subxComment"># var row-bitmap/ebx: int = *letter-bitmap</span>
+<span id="L33" class="LineNr">33 </span>      53/push-ebx
+<span id="L34" class="LineNr">34 </span>      8b/-&gt; *esi 3/r32/ebx
+<span id="L35" class="LineNr">35 </span>      {
+<span id="L36" class="LineNr">36 </span>        <span class="subxComment"># if (x &lt; xmin) break</span>
+<span id="L37" class="LineNr">37 </span>        39/compare %eax 1/r32/ecx
+<span id="L38" class="LineNr">38 </span>        7c/jump-if-&lt; <span class="Constant">break</span>/disp8
+<span id="L39" class="LineNr">39 </span>        <span class="subxComment"># shift LSB from row-bitmap into carry flag (CF)</span>
+<span id="L40" class="LineNr">40 </span>        c1 5/subop/shift-right-logical %ebx 1/imm8
+<span id="L41" class="LineNr">41 </span>        <span class="subxComment"># if LSB, draw a pixel</span>
+<span id="L42" class="LineNr">42 </span>        {
+<span id="L43" class="LineNr">43 </span>          73/jump-if-not-CF <span class="Constant">break</span>/disp8
+<span id="L44" class="LineNr">44 </span>          (<a href='101screen.subx.html#L3'>pixel</a> *(ebp+8) %eax %edx *(ebp+0x18))
+<span id="L45" class="LineNr">45 </span>        }
+<span id="L46" class="LineNr">46 </span>        <span class="subxComment"># --x</span>
+<span id="L47" class="LineNr">47 </span>        48/decrement-eax
+<span id="L48" class="LineNr">48 </span>        <span class="subxComment">#</span>
+<span id="L49" class="LineNr">49 </span>        eb/jump <span class="Constant">loop</span>/disp8
+<span id="L50" class="LineNr">50 </span>      }
+<span id="L51" class="LineNr">51 </span>      <span class="subxComment"># reclaim row-bitmap</span>
+<span id="L52" class="LineNr">52 </span>      5b/pop-to-ebx
+<span id="L53" class="LineNr">53 </span>      <span class="subxComment"># ++y</span>
+<span id="L54" class="LineNr">54 </span>      42/increment-edx
+<span id="L55" class="LineNr">55 </span>      <span class="subxComment"># next bitmap row</span>
+<span id="L56" class="LineNr">56 </span>      46/increment-esi
+<span id="L57" class="LineNr">57 </span>      <span class="subxComment">#</span>
+<span id="L58" class="LineNr">58 </span>      eb/jump <span class="Constant">loop</span>/disp8
+<span id="L59" class="LineNr">59 </span>    }
+<span id="L60" class="LineNr">60 </span><span class="Constant">$draw-grapheme:end</span>:
+<span id="L61" class="LineNr">61 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L62" class="LineNr">62 </span>    5e/pop-to-esi
+<span id="L63" class="LineNr">63 </span>    5b/pop-to-ebx
+<span id="L64" class="LineNr">64 </span>    5a/pop-to-edx
+<span id="L65" class="LineNr">65 </span>    59/pop-to-ecx
+<span id="L66" class="LineNr">66 </span>    58/pop-to-eax
+<span id="L67" class="LineNr">67 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L68" class="LineNr">68 </span>    89/&lt;- %esp 5/r32/ebp
+<span id="L69" class="LineNr">69 </span>    5d/pop-to-ebp
+<span id="L70" class="LineNr">70 </span>    c3/return
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->