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| author | Kartik Agaram <vc@akkartik.com> | 2021-06-15 21:50:13 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2021-06-15 21:50:13 -0700 |
| commit | dd60caa3f51c5117c0193f8f3272e1c7f5230eb7 (patch) | |
| tree | 4ea39cbf1550767a5004c450b807cf5c968ac5fa /html/103grapheme.subx.html | |
| parent | 678c9366331641111c05b4508988405c4400f026 (diff) | |
| download | mu-dd60caa3f51c5117c0193f8f3272e1c7f5230eb7.tar.gz | |
.
Diffstat (limited to 'html/103grapheme.subx.html')
| -rw-r--r-- | html/103grapheme.subx.html | 367 |
1 files changed, 214 insertions, 153 deletions
diff --git a/html/103grapheme.subx.html b/html/103grapheme.subx.html index 42c4f598..549c5064 100644 --- a/html/103grapheme.subx.html +++ b/html/103grapheme.subx.html @@ -75,159 +75,220 @@ if ('onhashchange' in window) { <span id="L18" class="LineNr"> 18 </span> <span class="subxS1Comment"># . prologue</span> <span id="L19" class="LineNr"> 19 </span> 55/push-ebp <span id="L20" class="LineNr"> 20 </span> 89/<- %ebp 4/r32/esp -<span id="L21" class="LineNr"> 21 </span> <span class="subxS1Comment"># . save registers</span> -<span id="L22" class="LineNr"> 22 </span> 50/push-eax -<span id="L23" class="LineNr"> 23 </span> 51/push-ecx -<span id="L24" class="LineNr"> 24 </span> 52/push-edx -<span id="L25" class="LineNr"> 25 </span> 53/push-ebx -<span id="L26" class="LineNr"> 26 </span> 56/push-esi -<span id="L27" class="LineNr"> 27 </span> <span class="subxComment"># var letter-bitmap/esi = font[g]</span> -<span id="L28" class="LineNr"> 28 </span> 8b/-> *(ebp+8) 6/r32/esi -<span id="L29" class="LineNr"> 29 </span> c1 4/subop/shift-left %esi 4/imm8 -<span id="L30" class="LineNr"> 30 </span> 81 0/subop/add %esi <span class="SpecialChar"><a href='boot.subx.html#L657'>Font</a></span>/imm32 -<span id="L31" class="LineNr"> 31 </span> <span class="subxComment"># if (letter-bitmap >= 0x9400) return # characters beyond ASCII currently not supported</span> -<span id="L32" class="LineNr"> 32 </span> 81 7/subop/compare %esi 0x9400/imm32 -<span id="L33" class="LineNr"> 33 </span> 7d/jump-if->= $draw-grapheme-on-real-screen:end/disp8 -<span id="L34" class="LineNr"> 34 </span> <span class="subxComment"># var ycurr/edx: int = y*16</span> -<span id="L35" class="LineNr"> 35 </span> 8b/-> *(ebp+0x10) 2/r32/edx -<span id="L36" class="LineNr"> 36 </span> c1 4/subop/shift-left %edx 4/imm8 -<span id="L37" class="LineNr"> 37 </span> <span class="subxComment"># var ymax/ebx: int = ycurr + 16</span> -<span id="L38" class="LineNr"> 38 </span> 8b/-> *(ebp+0x10) 3/r32/ebx -<span id="L39" class="LineNr"> 39 </span> c1 4/subop/shift-left %ebx 4/imm8 -<span id="L40" class="LineNr"> 40 </span> 81 0/subop/add %ebx 0x10/imm32 -<span id="L41" class="LineNr"> 41 </span> { -<span id="L42" class="LineNr"> 42 </span> <span class="subxComment"># if (ycurr >= ymax) break</span> -<span id="L43" class="LineNr"> 43 </span> 39/compare %edx 3/r32/ebx -<span id="L44" class="LineNr"> 44 </span> 7d/jump-if->= <span class="Constant">break</span>/disp8 -<span id="L45" class="LineNr"> 45 </span> <span class="subxComment"># var xcurr/eax: int = x*8 + 7</span> -<span id="L46" class="LineNr"> 46 </span> 8b/-> *(ebp+0xc) 0/r32/eax <span class="subxComment"># font-width - 1</span> -<span id="L47" class="LineNr"> 47 </span> c1 4/subop/shift-left %eax 3/imm8 -<span id="L48" class="LineNr"> 48 </span> 05/add-to-eax 7/imm32 -<span id="L49" class="LineNr"> 49 </span> <span class="subxComment"># var xmin/ecx: int = x*8</span> -<span id="L50" class="LineNr"> 50 </span> 8b/-> *(ebp+0xc) 1/r32/ecx -<span id="L51" class="LineNr"> 51 </span> c1 4/subop/shift-left %ecx 3/imm8 -<span id="L52" class="LineNr"> 52 </span> <span class="subxComment"># var row-bitmap/ebx: int = *letter-bitmap</span> -<span id="L53" class="LineNr"> 53 </span> 53/push-ebx -<span id="L54" class="LineNr"> 54 </span> 8b/-> *esi 3/r32/ebx -<span id="L55" class="LineNr"> 55 </span> { -<span id="L56" class="LineNr"> 56 </span> <span class="subxComment"># if (xcurr < xmin) break</span> -<span id="L57" class="LineNr"> 57 </span> 39/compare %eax 1/r32/ecx -<span id="L58" class="LineNr"> 58 </span> 7c/jump-if-< <span class="Constant">break</span>/disp8 -<span id="L59" class="LineNr"> 59 </span> <span class="subxComment"># shift LSB from row-bitmap into carry flag (CF)</span> -<span id="L60" class="LineNr"> 60 </span> c1 5/subop/shift-right-logical %ebx 1/imm8 -<span id="L61" class="LineNr"> 61 </span> <span class="subxComment"># if LSB, draw a pixel in the given color</span> -<span id="L62" class="LineNr"> 62 </span> { -<span id="L63" class="LineNr"> 63 </span> 73/jump-if-not-CF <span class="Constant">break</span>/disp8 -<span id="L64" class="LineNr"> 64 </span> (<a href='101screen.subx.html#L8'>pixel-on-real-screen</a> %eax %edx *(ebp+0x14)) -<span id="L65" class="LineNr"> 65 </span> eb/jump $draw-grapheme-on-real-screen:continue/disp8 -<span id="L66" class="LineNr"> 66 </span> } -<span id="L67" class="LineNr"> 67 </span> <span class="subxComment"># otherwise use the background color</span> -<span id="L68" class="LineNr"> 68 </span> (<a href='101screen.subx.html#L8'>pixel-on-real-screen</a> %eax %edx *(ebp+0x18)) -<span id="L69" class="LineNr"> 69 </span><span class="Constant">$draw-grapheme-on-real-screen:continue</span>: -<span id="L70" class="LineNr"> 70 </span> <span class="subxComment"># --x</span> -<span id="L71" class="LineNr"> 71 </span> 48/decrement-eax -<span id="L72" class="LineNr"> 72 </span> <span class="subxComment">#</span> -<span id="L73" class="LineNr"> 73 </span> eb/jump <span class="Constant">loop</span>/disp8 -<span id="L74" class="LineNr"> 74 </span> } -<span id="L75" class="LineNr"> 75 </span> <span class="subxComment"># reclaim row-bitmap</span> -<span id="L76" class="LineNr"> 76 </span> 5b/pop-to-ebx -<span id="L77" class="LineNr"> 77 </span> <span class="subxComment"># ++y</span> -<span id="L78" class="LineNr"> 78 </span> 42/increment-edx -<span id="L79" class="LineNr"> 79 </span> <span class="subxComment"># next bitmap row</span> -<span id="L80" class="LineNr"> 80 </span> 46/increment-esi -<span id="L81" class="LineNr"> 81 </span> <span class="subxComment">#</span> -<span id="L82" class="LineNr"> 82 </span> eb/jump <span class="Constant">loop</span>/disp8 -<span id="L83" class="LineNr"> 83 </span> } -<span id="L84" class="LineNr"> 84 </span><span class="Constant">$draw-grapheme-on-real-screen:end</span>: -<span id="L85" class="LineNr"> 85 </span> <span class="subxS1Comment"># . restore registers</span> -<span id="L86" class="LineNr"> 86 </span> 5e/pop-to-esi -<span id="L87" class="LineNr"> 87 </span> 5b/pop-to-ebx -<span id="L88" class="LineNr"> 88 </span> 5a/pop-to-edx -<span id="L89" class="LineNr"> 89 </span> 59/pop-to-ecx -<span id="L90" class="LineNr"> 90 </span> 58/pop-to-eax -<span id="L91" class="LineNr"> 91 </span> <span class="subxS1Comment"># . epilogue</span> -<span id="L92" class="LineNr"> 92 </span> 89/<- %esp 5/r32/ebp -<span id="L93" class="LineNr"> 93 </span> 5d/pop-to-ebp -<span id="L94" class="LineNr"> 94 </span> c3/return -<span id="L95" class="LineNr"> 95 </span> -<span id="L96" class="LineNr"> 96 </span><span class="subxFunction">cursor-position-on-real-screen</span>: <span class="subxComment"># -> _/eax: int, _/ecx: int</span> -<span id="L97" class="LineNr"> 97 </span> <span class="subxS1Comment"># . prologue</span> -<span id="L98" class="LineNr"> 98 </span> 55/push-ebp -<span id="L99" class="LineNr"> 99 </span> 89/<- %ebp 4/r32/esp -<span id="L100" class="LineNr">100 </span> <span class="subxComment"># TODO: support fake screen; we currently assume 'screen' is always 0 (real)</span> -<span id="L101" class="LineNr">101 </span> 8b/-> *<span class="SpecialChar"><a href='103grapheme.subx.html#L170'>Real-screen-cursor-x</a></span> 0/r32/eax -<span id="L102" class="LineNr">102 </span> 8b/-> *<span class="SpecialChar"><a href='103grapheme.subx.html#L172'>Real-screen-cursor-y</a></span> 1/r32/ecx -<span id="L103" class="LineNr">103 </span><span class="Constant">$cursor-position-on-real-screen:end</span>: -<span id="L104" class="LineNr">104 </span> <span class="subxS1Comment"># . epilogue</span> -<span id="L105" class="LineNr">105 </span> 89/<- %esp 5/r32/ebp -<span id="L106" class="LineNr">106 </span> 5d/pop-to-ebp -<span id="L107" class="LineNr">107 </span> c3/return -<span id="L108" class="LineNr">108 </span> -<span id="L109" class="LineNr">109 </span><span class="subxFunction">set-cursor-position-on-real-screen</span>: <span class="subxComment"># x: int, y: int</span> -<span id="L110" class="LineNr">110 </span> <span class="subxS1Comment"># . prologue</span> -<span id="L111" class="LineNr">111 </span> 55/push-ebp -<span id="L112" class="LineNr">112 </span> 89/<- %ebp 4/r32/esp -<span id="L113" class="LineNr">113 </span> <span class="subxS1Comment"># . save registers</span> -<span id="L114" class="LineNr">114 </span> 50/push-eax -<span id="L115" class="LineNr">115 </span> <span class="subxComment">#</span> -<span id="L116" class="LineNr">116 </span> 8b/-> *(ebp+8) 0/r32/eax -<span id="L117" class="LineNr">117 </span> 89/<- *<span class="SpecialChar"><a href='103grapheme.subx.html#L170'>Real-screen-cursor-x</a></span> 0/r32/eax -<span id="L118" class="LineNr">118 </span> 8b/-> *(ebp+0xc) 0/r32/eax -<span id="L119" class="LineNr">119 </span> 89/<- *<span class="SpecialChar"><a href='103grapheme.subx.html#L172'>Real-screen-cursor-y</a></span> 0/r32/eax -<span id="L120" class="LineNr">120 </span><span class="Constant">$set-cursor-position-on-real-screen:end</span>: -<span id="L121" class="LineNr">121 </span> <span class="subxS1Comment"># . restore registers</span> -<span id="L122" class="LineNr">122 </span> 58/pop-to-eax -<span id="L123" class="LineNr">123 </span> <span class="subxS1Comment"># . epilogue</span> -<span id="L124" class="LineNr">124 </span> 89/<- %esp 5/r32/ebp -<span id="L125" class="LineNr">125 </span> 5d/pop-to-ebp -<span id="L126" class="LineNr">126 </span> c3/return -<span id="L127" class="LineNr">127 </span> -<span id="L128" class="LineNr">128 </span><span class="subxComment"># Not a real `show-cursor` primitive:</span> -<span id="L129" class="LineNr">129 </span><span class="subxComment"># - does not clear previous location cursor was shown at.</span> -<span id="L130" class="LineNr">130 </span><span class="subxComment"># - does not preserve what was at the cursor. Caller is responsible for</span> -<span id="L131" class="LineNr">131 </span><span class="subxComment"># tracking what was on the screen at this position before and passing it</span> -<span id="L132" class="LineNr">132 </span><span class="subxComment"># in again.</span> -<span id="L133" class="LineNr">133 </span><span class="subxComment"># - does not stop showing the cursor at this location when the cursor moves</span> -<span id="L134" class="LineNr">134 </span><span class="subxFunction">draw-cursor-on-real-screen</span>: <span class="subxComment"># g: grapheme</span> -<span id="L135" class="LineNr">135 </span> <span class="subxS1Comment"># . prologue</span> -<span id="L136" class="LineNr">136 </span> 55/push-ebp -<span id="L137" class="LineNr">137 </span> 89/<- %ebp 4/r32/esp -<span id="L138" class="LineNr">138 </span> <span class="subxS1Comment"># . save registers</span> -<span id="L139" class="LineNr">139 </span> 50/push-eax -<span id="L140" class="LineNr">140 </span> 51/push-ecx -<span id="L141" class="LineNr">141 </span> <span class="subxComment">#</span> -<span id="L142" class="LineNr">142 </span> (<a href='103grapheme.subx.html#L96'>cursor-position-on-real-screen</a>) <span class="subxComment"># => eax, ecx</span> -<span id="L143" class="LineNr">143 </span> (<a href='103grapheme.subx.html#L17'>draw-grapheme-on-real-screen</a> *(ebp+8) %eax %ecx 0 7) -<span id="L144" class="LineNr">144 </span><span class="Constant">$draw-cursor-on-real-screen:end</span>: -<span id="L145" class="LineNr">145 </span> <span class="subxS1Comment"># . restore registers</span> -<span id="L146" class="LineNr">146 </span> 59/pop-to-ecx -<span id="L147" class="LineNr">147 </span> 58/pop-to-eax -<span id="L148" class="LineNr">148 </span> <span class="subxS1Comment"># . epilogue</span> -<span id="L149" class="LineNr">149 </span> 89/<- %esp 5/r32/ebp -<span id="L150" class="LineNr">150 </span> 5d/pop-to-ebp -<span id="L151" class="LineNr">151 </span> c3/return -<span id="L152" class="LineNr">152 </span> -<span id="L153" class="LineNr">153 </span>== data -<span id="L154" class="LineNr">154 </span> -<span id="L155" class="LineNr">155 </span><span class="subxComment"># The cursor is where certain Mu functions (usually of the form</span> -<span id="L156" class="LineNr">156 </span><span class="subxComment"># 'draw*cursor*') print to by default.</span> -<span id="L157" class="LineNr">157 </span><span class="subxComment">#</span> -<span id="L158" class="LineNr">158 </span><span class="subxComment"># We don't bother displaying the cursor when drawing. It only becomes visible</span> -<span id="L159" class="LineNr">159 </span><span class="subxComment"># on draw-cursor, which is quite rickety (see above)</span> -<span id="L160" class="LineNr">160 </span><span class="subxComment">#</span> -<span id="L161" class="LineNr">161 </span><span class="subxComment"># It's up to applications to manage cursor display:</span> -<span id="L162" class="LineNr">162 </span><span class="subxComment"># - clean up where it used to be</span> -<span id="L163" class="LineNr">163 </span><span class="subxComment"># - display the cursor before waiting for a key</span> -<span id="L164" class="LineNr">164 </span><span class="subxComment"># - ensure its location appropriately suggests the effect keystrokes will have</span> -<span id="L165" class="LineNr">165 </span><span class="subxComment"># - ensure its contents (and colors) appropriately reflect the state of the</span> -<span id="L166" class="LineNr">166 </span><span class="subxComment"># screen</span> -<span id="L167" class="LineNr">167 </span><span class="subxComment">#</span> -<span id="L168" class="LineNr">168 </span><span class="subxComment"># There's no blinking, etc. We aren't using any hardware-supported text mode</span> -<span id="L169" class="LineNr">169 </span><span class="subxComment"># here.</span> -<span id="L170" class="LineNr">170 </span><span class="SpecialChar">Real-screen-cursor-x</span>: -<span id="L171" class="LineNr">171 </span> 0/imm32 -<span id="L172" class="LineNr">172 </span><span class="SpecialChar">Real-screen-cursor-y</span>: -<span id="L173" class="LineNr">173 </span> 0/imm32 +<span id="L21" class="LineNr"> 21 </span> <span class="subxComment">#</span> +<span id="L22" class="LineNr"> 22 </span> (<a href='103grapheme.subx.html#L74'>draw-grapheme-on-screen-buffer</a> *<span class="SpecialChar"><a href='boot.subx.html#L650'>Video-memory-addr</a></span> *(ebp+8) *(ebp+0xc) *(ebp+0x10) *(ebp+0x14) *(ebp+0x18) 0x80 0x30) +<span id="L23" class="LineNr"> 23 </span><span class="Constant">$draw-grapheme-on-real-screen:end</span>: +<span id="L24" class="LineNr"> 24 </span> <span class="subxS1Comment"># . epilogue</span> +<span id="L25" class="LineNr"> 25 </span> 89/<- %esp 5/r32/ebp +<span id="L26" class="LineNr"> 26 </span> 5d/pop-to-ebp +<span id="L27" class="LineNr"> 27 </span> c3/return +<span id="L28" class="LineNr"> 28 </span> +<span id="L29" class="LineNr"> 29 </span><span class="subxFunction">draw-grapheme-on-screen-array</span>: <span class="subxComment"># screen-data: (addr array byte), g: grapheme, x: int, y: int, color: int, background-color: int, screen-width: int, screen-height: int</span> +<span id="L30" class="LineNr"> 30 </span> <span class="subxS1Comment"># . prologue</span> +<span id="L31" class="LineNr"> 31 </span> 55/push-ebp +<span id="L32" class="LineNr"> 32 </span> 89/<- %ebp 4/r32/esp +<span id="L33" class="LineNr"> 33 </span> <span class="subxS1Comment"># . save registers</span> +<span id="L34" class="LineNr"> 34 </span> 50/push-eax +<span id="L35" class="LineNr"> 35 </span> 51/push-ecx +<span id="L36" class="LineNr"> 36 </span> 52/push-edx +<span id="L37" class="LineNr"> 37 </span> <span class="subxComment"># if screen-width*screen-height > len(screen-data) abort</span> +<span id="L38" class="LineNr"> 38 </span> { +<span id="L39" class="LineNr"> 39 </span> <span class="subxComment"># ecx = len(screen-data)</span> +<span id="L40" class="LineNr"> 40 </span> 8b/-> *(ebp+8) 1/r32/ecx +<span id="L41" class="LineNr"> 41 </span> 8b/-> *ecx 1/r32/ecx +<span id="L42" class="LineNr"> 42 </span> <span class="subxComment"># eax = screen-width*screen-height</span> +<span id="L43" class="LineNr"> 43 </span> ba/copy-to-edx 0/imm32 +<span id="L44" class="LineNr"> 44 </span> 8b/-> *(ebp+0x20) 0/r32/eax +<span id="L45" class="LineNr"> 45 </span> f7 4/subop/multiply-into-eax *(ebp+0x24) +<span id="L46" class="LineNr"> 46 </span> 81 7/subop/compare %edx 0/imm32 +<span id="L47" class="LineNr"> 47 </span> 0f 85/jump-if-!= $draw-grapheme-on-screen-array:overflow/disp32 +<span id="L48" class="LineNr"> 48 </span> <span class="subxComment"># if (eax > ecx) abort</span> +<span id="L49" class="LineNr"> 49 </span> 39/compare %eax 1/r32/ecx +<span id="L50" class="LineNr"> 50 </span> 0f 8f/jump-if-> $draw-grapheme-on-screen-array:<a href='317abort.subx.html#L5'>abort</a>/disp32 +<span id="L51" class="LineNr"> 51 </span> } +<span id="L52" class="LineNr"> 52 </span> <span class="subxComment"># eax = screen-data+4 (skip length)</span> +<span id="L53" class="LineNr"> 53 </span> 8b/-> *(ebp+8) 0/r32/eax +<span id="L54" class="LineNr"> 54 </span> 05/add-to-eax 4/imm32 +<span id="L55" class="LineNr"> 55 </span> <span class="subxComment">#</span> +<span id="L56" class="LineNr"> 56 </span> (<a href='103grapheme.subx.html#L74'>draw-grapheme-on-screen-buffer</a> %eax *(ebp+0xc) *(ebp+0x10) *(ebp+0x14) *(ebp+0x18) *(ebp+0x1c) *(ebp+0x20) *(ebp+0x24)) +<span id="L57" class="LineNr"> 57 </span><span class="Constant">$draw-grapheme-on-screen-array:end</span>: +<span id="L58" class="LineNr"> 58 </span> <span class="subxS1Comment"># . restore registers</span> +<span id="L59" class="LineNr"> 59 </span> 5a/pop-to-edx +<span id="L60" class="LineNr"> 60 </span> 59/pop-to-ecx +<span id="L61" class="LineNr"> 61 </span> 58/pop-to-eax +<span id="L62" class="LineNr"> 62 </span> <span class="subxS1Comment"># . epilogue</span> +<span id="L63" class="LineNr"> 63 </span> 89/<- %esp 5/r32/ebp +<span id="L64" class="LineNr"> 64 </span> 5d/pop-to-ebp +<span id="L65" class="LineNr"> 65 </span> c3/return +<span id="L66" class="LineNr"> 66 </span> +<span id="L67" class="LineNr"> 67 </span><span class="Constant">$draw-grapheme-on-screen-array:overflow</span>: +<span id="L68" class="LineNr"> 68 </span> (<a href='317abort.subx.html#L5'>abort</a> <span class="Constant">"draw-grapheme-on-screen-array: <a href='500fake-screen.mu.html#L14'>screen</a> dimensions too large"</span>) +<span id="L69" class="LineNr"> 69 </span> +<span id="L70" class="LineNr"> 70 </span><span class="Constant">$draw-grapheme-on-screen-array:<a href='317abort.subx.html#L5'>abort</a></span>: +<span id="L71" class="LineNr"> 71 </span> (<a href='317abort.subx.html#L5'>abort</a> <span class="Constant">"draw-grapheme-on-screen-array: coordinates are off the screen. Are the <a href='500fake-screen.mu.html#L14'>screen</a> dimensions correct?"</span>) +<span id="L72" class="LineNr"> 72 </span> +<span id="L73" class="LineNr"> 73 </span><span class="subxComment"># 'buffer' here is not a valid Mu type: a naked address without a length.</span> +<span id="L74" class="LineNr"> 74 </span><span class="subxFunction">draw-grapheme-on-screen-buffer</span>: <span class="subxComment"># buffer: (addr byte), g: grapheme, x: int, y: int, color: int, background-color: int, screen-width: int, screen-height: int</span> +<span id="L75" class="LineNr"> 75 </span> <span class="subxS1Comment"># . prologue</span> +<span id="L76" class="LineNr"> 76 </span> 55/push-ebp +<span id="L77" class="LineNr"> 77 </span> 89/<- %ebp 4/r32/esp +<span id="L78" class="LineNr"> 78 </span> <span class="subxS1Comment"># . save registers</span> +<span id="L79" class="LineNr"> 79 </span> 50/push-eax +<span id="L80" class="LineNr"> 80 </span> 51/push-ecx +<span id="L81" class="LineNr"> 81 </span> 52/push-edx +<span id="L82" class="LineNr"> 82 </span> 53/push-ebx +<span id="L83" class="LineNr"> 83 </span> 56/push-esi +<span id="L84" class="LineNr"> 84 </span> <span class="subxComment"># switch screen-width and screen-height from grapheme to pixel units</span> +<span id="L85" class="LineNr"> 85 </span> c1 4/subop/shift-left *(ebp+20) 3/imm8/log2-font-width +<span id="L86" class="LineNr"> 86 </span> c1 4/subop/shift-left *(ebp+24) 4/imm8/log2-font-height +<span id="L87" class="LineNr"> 87 </span> <span class="subxComment"># esi = g</span> +<span id="L88" class="LineNr"> 88 </span> 8b/-> *(ebp+0xc) 6/r32/esi +<span id="L89" class="LineNr"> 89 </span> <span class="subxComment"># if (g >= 128) return # characters beyond ASCII currently not supported</span> +<span id="L90" class="LineNr"> 90 </span> 81 7/subop/compare %esi 0x80/imm32 +<span id="L91" class="LineNr"> 91 </span> 0f 8d/jump-if->= $draw-grapheme-on-screen-buffer:end/disp32 +<span id="L92" class="LineNr"> 92 </span> <span class="subxComment"># var letter-bitmap/esi = font[g]</span> +<span id="L93" class="LineNr"> 93 </span> c1 4/subop/shift-left %esi 4/imm8 +<span id="L94" class="LineNr"> 94 </span> 81 0/subop/add %esi <span class="SpecialChar"><a href='boot.subx.html#L671'>Font</a></span>/imm32 +<span id="L95" class="LineNr"> 95 </span> <span class="subxComment"># var ycurr/edx: int = y*16</span> +<span id="L96" class="LineNr"> 96 </span> 8b/-> *(ebp+0x14) 2/r32/edx +<span id="L97" class="LineNr"> 97 </span> c1 4/subop/shift-left %edx 4/imm8 +<span id="L98" class="LineNr"> 98 </span> <span class="subxComment"># var ymax/ebx: int = ycurr + 16</span> +<span id="L99" class="LineNr"> 99 </span> 8b/-> *(ebp+0x14) 3/r32/ebx +<span id="L100" class="LineNr">100 </span> c1 4/subop/shift-left %ebx 4/imm8 +<span id="L101" class="LineNr">101 </span> 81 0/subop/add %ebx 0x10/imm32 +<span id="L102" class="LineNr">102 </span> { +<span id="L103" class="LineNr">103 </span> <span class="subxComment"># if (ycurr >= ymax) break</span> +<span id="L104" class="LineNr">104 </span> 39/compare %edx 3/r32/ebx +<span id="L105" class="LineNr">105 </span> 0f 8d/jump-if->= <span class="Constant">break</span>/disp32 +<span id="L106" class="LineNr">106 </span> <span class="subxComment"># var xcurr/eax: int = x*8 + 7</span> +<span id="L107" class="LineNr">107 </span> 8b/-> *(ebp+0x10) 0/r32/eax <span class="subxComment"># font-width - 1</span> +<span id="L108" class="LineNr">108 </span> c1 4/subop/shift-left %eax 3/imm8 +<span id="L109" class="LineNr">109 </span> 05/add-to-eax 7/imm32 +<span id="L110" class="LineNr">110 </span> <span class="subxComment"># var xmin/ecx: int = x*8</span> +<span id="L111" class="LineNr">111 </span> 8b/-> *(ebp+0x10) 1/r32/ecx +<span id="L112" class="LineNr">112 </span> c1 4/subop/shift-left %ecx 3/imm8 +<span id="L113" class="LineNr">113 </span> <span class="subxComment"># var row-bitmap/ebx: int = *letter-bitmap</span> +<span id="L114" class="LineNr">114 </span> 53/push-ebx +<span id="L115" class="LineNr">115 </span> 8b/-> *esi 3/r32/ebx +<span id="L116" class="LineNr">116 </span> { +<span id="L117" class="LineNr">117 </span> <span class="subxComment"># if (xcurr < xmin) break</span> +<span id="L118" class="LineNr">118 </span> 39/compare %eax 1/r32/ecx +<span id="L119" class="LineNr">119 </span> 7c/jump-if-< <span class="Constant">break</span>/disp8 +<span id="L120" class="LineNr">120 </span> <span class="subxComment"># shift LSB from row-bitmap into carry flag (CF)</span> +<span id="L121" class="LineNr">121 </span> c1 5/subop/shift-right-logical %ebx 1/imm8 +<span id="L122" class="LineNr">122 </span> <span class="subxComment"># if LSB, draw a pixel in the given color</span> +<span id="L123" class="LineNr">123 </span> { +<span id="L124" class="LineNr">124 </span> 73/jump-if-not-CF <span class="Constant">break</span>/disp8 +<span id="L125" class="LineNr">125 </span> (<a href='101screen.subx.html#L21'>pixel-on-screen-buffer</a> *(ebp+8) %eax %edx *(ebp+0x18) *(ebp+0x20) *(ebp+0x24)) +<span id="L126" class="LineNr">126 </span> eb/jump $draw-grapheme-on-screen-buffer:continue/disp8 +<span id="L127" class="LineNr">127 </span> } +<span id="L128" class="LineNr">128 </span> <span class="subxComment"># otherwise use the background color</span> +<span id="L129" class="LineNr">129 </span> (<a href='101screen.subx.html#L21'>pixel-on-screen-buffer</a> *(ebp+8) %eax %edx *(ebp+0x1c) *(ebp+0x20) *(ebp+0x24)) +<span id="L130" class="LineNr">130 </span><span class="Constant">$draw-grapheme-on-screen-buffer:continue</span>: +<span id="L131" class="LineNr">131 </span> <span class="subxComment"># --x</span> +<span id="L132" class="LineNr">132 </span> 48/decrement-eax +<span id="L133" class="LineNr">133 </span> <span class="subxComment">#</span> +<span id="L134" class="LineNr">134 </span> eb/jump <span class="Constant">loop</span>/disp8 +<span id="L135" class="LineNr">135 </span> } +<span id="L136" class="LineNr">136 </span> <span class="subxComment"># reclaim row-bitmap</span> +<span id="L137" class="LineNr">137 </span> 5b/pop-to-ebx +<span id="L138" class="LineNr">138 </span> <span class="subxComment"># ++y</span> +<span id="L139" class="LineNr">139 </span> 42/increment-edx +<span id="L140" class="LineNr">140 </span> <span class="subxComment"># next bitmap row</span> +<span id="L141" class="LineNr">141 </span> 46/increment-esi +<span id="L142" class="LineNr">142 </span> <span class="subxComment">#</span> +<span id="L143" class="LineNr">143 </span> e9/jump <span class="Constant">loop</span>/disp32 +<span id="L144" class="LineNr">144 </span> } +<span id="L145" class="LineNr">145 </span><span class="Constant">$draw-grapheme-on-screen-buffer:end</span>: +<span id="L146" class="LineNr">146 </span> <span class="subxS1Comment"># . restore registers</span> +<span id="L147" class="LineNr">147 </span> 5e/pop-to-esi +<span id="L148" class="LineNr">148 </span> 5b/pop-to-ebx +<span id="L149" class="LineNr">149 </span> 5a/pop-to-edx +<span id="L150" class="LineNr">150 </span> 59/pop-to-ecx +<span id="L151" class="LineNr">151 </span> 58/pop-to-eax +<span id="L152" class="LineNr">152 </span> <span class="subxS1Comment"># . epilogue</span> +<span id="L153" class="LineNr">153 </span> 89/<- %esp 5/r32/ebp +<span id="L154" class="LineNr">154 </span> 5d/pop-to-ebp +<span id="L155" class="LineNr">155 </span> c3/return +<span id="L156" class="LineNr">156 </span> +<span id="L157" class="LineNr">157 </span><span class="subxFunction">cursor-position-on-real-screen</span>: <span class="subxComment"># -> _/eax: int, _/ecx: int</span> +<span id="L158" class="LineNr">158 </span> <span class="subxS1Comment"># . prologue</span> +<span id="L159" class="LineNr">159 </span> 55/push-ebp +<span id="L160" class="LineNr">160 </span> 89/<- %ebp 4/r32/esp +<span id="L161" class="LineNr">161 </span> <span class="subxComment"># TODO: support fake screen; we currently assume 'screen' is always 0 (real)</span> +<span id="L162" class="LineNr">162 </span> 8b/-> *<span class="SpecialChar"><a href='103grapheme.subx.html#L231'>Real-screen-cursor-x</a></span> 0/r32/eax +<span id="L163" class="LineNr">163 </span> 8b/-> *<span class="SpecialChar"><a href='103grapheme.subx.html#L233'>Real-screen-cursor-y</a></span> 1/r32/ecx +<span id="L164" class="LineNr">164 </span><span class="Constant">$cursor-position-on-real-screen:end</span>: +<span id="L165" class="LineNr">165 </span> <span class="subxS1Comment"># . epilogue</span> +<span id="L166" class="LineNr">166 </span> 89/<- %esp 5/r32/ebp +<span id="L167" class="LineNr">167 </span> 5d/pop-to-ebp +<span id="L168" class="LineNr">168 </span> c3/return +<span id="L169" class="LineNr">169 </span> +<span id="L170" class="LineNr">170 </span><span class="subxFunction">set-cursor-position-on-real-screen</span>: <span class="subxComment"># x: int, y: int</span> +<span id="L171" class="LineNr">171 </span> <span class="subxS1Comment"># . prologue</span> +<span id="L172" class="LineNr">172 </span> 55/push-ebp +<span id="L173" class="LineNr">173 </span> 89/<- %ebp 4/r32/esp +<span id="L174" class="LineNr">174 </span> <span class="subxS1Comment"># . save registers</span> +<span id="L175" class="LineNr">175 </span> 50/push-eax +<span id="L176" class="LineNr">176 </span> <span class="subxComment">#</span> +<span id="L177" class="LineNr">177 </span> 8b/-> *(ebp+8) 0/r32/eax +<span id="L178" class="LineNr">178 </span> 89/<- *<span class="SpecialChar"><a href='103grapheme.subx.html#L231'>Real-screen-cursor-x</a></span> 0/r32/eax +<span id="L179" class="LineNr">179 </span> 8b/-> *(ebp+0xc) 0/r32/eax +<span id="L180" class="LineNr">180 </span> 89/<- *<span class="SpecialChar"><a href='103grapheme.subx.html#L233'>Real-screen-cursor-y</a></span> 0/r32/eax +<span id="L181" class="LineNr">181 </span><span class="Constant">$set-cursor-position-on-real-screen:end</span>: +<span id="L182" class="LineNr">182 </span> <span class="subxS1Comment"># . restore registers</span> +<span id="L183" class="LineNr">183 </span> 58/pop-to-eax +<span id="L184" class="LineNr">184 </span> <span class="subxS1Comment"># . epilogue</span> +<span id="L185" class="LineNr">185 </span> 89/<- %esp 5/r32/ebp +<span id="L186" class="LineNr">186 </span> 5d/pop-to-ebp +<span id="L187" class="LineNr">187 </span> c3/return +<span id="L188" class="LineNr">188 </span> +<span id="L189" class="LineNr">189 </span><span class="subxComment"># Not a real `show-cursor` primitive:</span> +<span id="L190" class="LineNr">190 </span><span class="subxComment"># - does not clear previous location cursor was shown at.</span> +<span id="L191" class="LineNr">191 </span><span class="subxComment"># - does not preserve what was at the cursor. Caller is responsible for</span> +<span id="L192" class="LineNr">192 </span><span class="subxComment"># tracking what was on the screen at this position before and passing it</span> +<span id="L193" class="LineNr">193 </span><span class="subxComment"># in again.</span> +<span id="L194" class="LineNr">194 </span><span class="subxComment"># - does not stop showing the cursor at this location when the cursor moves</span> +<span id="L195" class="LineNr">195 </span><span class="subxFunction">draw-cursor-on-real-screen</span>: <span class="subxComment"># g: grapheme</span> +<span id="L196" class="LineNr">196 </span> <span class="subxS1Comment"># . prologue</span> +<span id="L197" class="LineNr">197 </span> 55/push-ebp +<span id="L198" class="LineNr">198 </span> 89/<- %ebp 4/r32/esp +<span id="L199" class="LineNr">199 </span> <span class="subxS1Comment"># . save registers</span> +<span id="L200" class="LineNr">200 </span> 50/push-eax +<span id="L201" class="LineNr">201 </span> 51/push-ecx +<span id="L202" class="LineNr">202 </span> <span class="subxComment">#</span> +<span id="L203" class="LineNr">203 </span> (<a href='103grapheme.subx.html#L157'>cursor-position-on-real-screen</a>) <span class="subxComment"># => eax, ecx</span> +<span id="L204" class="LineNr">204 </span> (<a href='103grapheme.subx.html#L17'>draw-grapheme-on-real-screen</a> *(ebp+8) %eax %ecx 0 7) +<span id="L205" class="LineNr">205 </span><span class="Constant">$draw-cursor-on-real-screen:end</span>: +<span id="L206" class="LineNr">206 </span> <span class="subxS1Comment"># . restore registers</span> +<span id="L207" class="LineNr">207 </span> 59/pop-to-ecx +<span id="L208" class="LineNr">208 </span> 58/pop-to-eax +<span id="L209" class="LineNr">209 </span> <span class="subxS1Comment"># . epilogue</span> +<span id="L210" class="LineNr">210 </span> 89/<- %esp 5/r32/ebp +<span id="L211" class="LineNr">211 </span> 5d/pop-to-ebp +<span id="L212" class="LineNr">212 </span> c3/return +<span id="L213" class="LineNr">213 </span> +<span id="L214" class="LineNr">214 </span>== data +<span id="L215" class="LineNr">215 </span> +<span id="L216" class="LineNr">216 </span><span class="subxComment"># The cursor is where certain Mu functions (usually of the form</span> +<span id="L217" class="LineNr">217 </span><span class="subxComment"># 'draw*cursor*') print to by default.</span> +<span id="L218" class="LineNr">218 </span><span class="subxComment">#</span> +<span id="L219" class="LineNr">219 </span><span class="subxComment"># We don't bother displaying the cursor when drawing. It only becomes visible</span> +<span id="L220" class="LineNr">220 </span><span class="subxComment"># on draw-cursor, which is quite rickety (see above)</span> +<span id="L221" class="LineNr">221 </span><span class="subxComment">#</span> +<span id="L222" class="LineNr">222 </span><span class="subxComment"># It's up to applications to manage cursor display:</span> +<span id="L223" class="LineNr">223 </span><span class="subxComment"># - clean up where it used to be</span> +<span id="L224" class="LineNr">224 </span><span class="subxComment"># - display the cursor before waiting for a key</span> +<span id="L225" class="LineNr">225 </span><span class="subxComment"># - ensure its location appropriately suggests the effect keystrokes will have</span> +<span id="L226" class="LineNr">226 </span><span class="subxComment"># - ensure its contents (and colors) appropriately reflect the state of the</span> +<span id="L227" class="LineNr">227 </span><span class="subxComment"># screen</span> +<span id="L228" class="LineNr">228 </span><span class="subxComment">#</span> +<span id="L229" class="LineNr">229 </span><span class="subxComment"># There's no blinking, etc. We aren't using any hardware-supported text mode</span> +<span id="L230" class="LineNr">230 </span><span class="subxComment"># here.</span> +<span id="L231" class="LineNr">231 </span><span class="SpecialChar">Real-screen-cursor-x</span>: +<span id="L232" class="LineNr">232 </span> 0/imm32 +<span id="L233" class="LineNr">233 </span><span class="SpecialChar">Real-screen-cursor-y</span>: +<span id="L234" class="LineNr">234 </span> 0/imm32 </pre> </body> </html> |