FPM lock journal style.

1 files changed, 21 insertions, 18 deletions

diff --git a/_site/log/matrix-digital-rain/index.html b/_site/log/matrix-digital-rain/index.html
index f254ed2..8383776 100644
--- a/_site/log/matrix-digital-rain/index.html
+++ b/_site/log/matrix-digital-rain/index.html
@@ -54,45 +54,48 @@ than it needed to be.</p>
 </video>
 
 <p>Moved phosphor decay into the 4th byte of the RGB union–should’ve done this 
-in 2022. What was I thinking.</p>
+in 2022; What was I thinking.</p>
 
 <p>Keeping the RGB union despite portability concerns. All my systems are
 little-endian and the code is cleaner this way.</p>
 
 <p>Fixed Unicode by introducing a charset array. UNICODE(min, max) packs Unicode
-ranges into uint64–low four bytes for start, high four bytes for end.
+ranges into uint64: low four bytes for start, high four bytes for end.
 insert_code() unpacks a random block and picks a character from it:</p>
 
-<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>static uint64_t glyphs[] = {
+<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>#define UNICODE(min, max)  (((uint64_t)max &lt;&lt; 32) | min)
+
+static uint64_t glyphs[] = {
     UNICODE(0x0021, 0x007E), /* ASCII */
     UNICODE(0xFF65, 0xFF9F), /* Half-width Katakana */
 };
-</code></pre></div></div>
-
-<p>Full-width Katakana breaks column alignment. Stick to half-width
-(U+FF61-U+FF9F) range. Compile with -DNOKANA to disable Katakana altogether.</p>
 
-<p>blend() simulates phosphor decay by eroding RGB channels toward
-background color:</p>
-
-<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>static inline void blend(matrix *mat, size_t row, size_t col)
+static inline void insert_code(matrix *mat,
+    size_t row, size_t col) 
 {
-    unsigned char *color = mat-&gt;rgb[index(mat, row, col)].color;
-    color[R] = color[R] - (color[R] - RGB_BG_RED) / DECAY_MPLIER;
-    color[G] = color[G] - (color[G] - RGB_BG_GRN) / DECAY_MPLIER;
-    color[B] = color[B] - (color[B] - RGB_BG_BLU) / DECAY_MPLIER;
+    uint64_t blk;
+    uint32_t min, max;
+
+    blk = glyphs[(rand() % glyphlen)];
+    min = (uint32_t)blk;
+    max = (uint32_t)(blk &gt;&gt; 32);
+    mat-&gt;code[index(mat, row, col)] = rand() % (max - min) + min;
 }
 </code></pre></div></div>
 
-<p>That’s still good. Leaving it alone.</p>
+<p>Full-width Katakana breaks column alignment. Stick to half-width
+(U+FF61-U+FF9F) range. Compile with -DNOKANA to disable Katakana altogether.</p>
+
+<p>blend() is still good. Leaving it alone.</p>
 
 <p>Tossed license and automake cruft. Just <code class="language-plaintext highlighter-rouge">cc -O3 main.c -o matrix</code> now. Don’t
 need the ceremony.</p>
 
-<p>Runs at 2-3% CPU on OpenBSD (T490). No regressions. Fans are quiet.</p>
+<p>Runs at 2-3% CPU on OpenBSD (T490). No cause to measure performance more
+precisely. No regressions. Fans are quiet.</p>
 
 <p>Commit:
-<a href="https://git.asciimx.com/matrix-digital-rain/commit/?id=03f8d87ba7c2e46bd3f3cc4c772fb3a2ac740c92">03f8d87</a></p>
+<a href="https://git.asciimx.com/matrix-digital-rain/commit/main.c?id=69a888a5b0bc4ef4bce4f86c1556a06f0f131fda">69a888a</a></p>
 </div>
           <p class="post-author right">by W. D. Sadeep Madurange</p>
         </div>