playing with Fire2012

* speedup: add functions to only blur rows or columns (50% faster)

* fire2012: tinkering with bur options. Vertical blur only when slider < 64 (faster); extra blur for  slider values >192 (bush burn)

Author: softhack007

wled00/FX.cpp

@@ -2098,7 +2098,7 @@ uint16_t mode_fire_2012() {
 
       // Step 4.  Map from heat cells to LED colors
       for (int j = 0; j < SEGLEN; j++) {
-        SEGMENT.setPixelColor(indexToVStrip(j, stripNr), ColorFromPalette(SEGPALETTE, MIN(heat[j],240), 255, NOBLEND));
+        SEGMENT.setPixelColor(indexToVStrip(j, stripNr), ColorFromPalette(SEGPALETTE, min(heat[j], byte(240)), 255, NOBLEND));
       }
     }
   };
@@ -2108,7 +2108,9 @@ uint16_t mode_fire_2012() {
 
   if (SEGMENT.is2D()) {
     uint8_t blurAmount = SEGMENT.custom2 >> 2;
-    SEGMENT.blur(blurAmount);
+    if (blurAmount > 48) blurAmount += blurAmount-48;             // extra blur when slider > 192  (bush burn)
+    if (blurAmount < 16) SEGMENT.blurCols(SEGMENT.custom2 >> 1);  // no side-burn when slider < 64 (faster)
+    else SEGMENT.blur(blurAmount);
   }
 
   if (it != SEGENV.step)

wled00/FX.h

@@ -602,6 +602,16 @@ typedef struct Segment {
     uint32_t color_from_palette(uint16_t, bool mapping, bool wrap, uint8_t mcol, uint8_t pbri = 255) const;
     uint32_t color_wheel(uint8_t pos) const;
 
+    // 2D Blur: shortcuts for bluring columns or rows only (50% faster than full 2D blur)
+    inline void blurCols(fract8 blur_amount, bool smear = false) { // blur all columns
+      const unsigned cols = virtualWidth();
+      for (unsigned k = 0; k < cols; k++) blurCol(k, blur_amount, smear); 
+    }
+    inline void blurRows(fract8 blur_amount, bool smear = false) { // blur all rows
+      const unsigned rows = virtualHeight();
+      for ( unsigned i = 0; i < rows; i++) blurRow(i, blur_amount, smear); 
+    }
+
     // 2D matrix
     uint16_t virtualWidth(void)  const; // segment width in virtual pixels (accounts for groupping and spacing)
     uint16_t virtualHeight(void) const; // segment height in virtual pixels (accounts for groupping and spacing)