Add animation effects + double-buffered FPS optimization

- Add 5 new animation effects (strobe, sparkle, pulse, candle, rainbow
  fade) to both static and gradient color strip streams
- Fix FPS drops (30→25) by using 5ms re-poll on frame skip instead of
  full frame_time, preventing synchronization misses between animation
  thread and processing loop
- Double-buffer animation output arrays to eliminate per-frame numpy
  allocations and reduce GC pressure
- Use uint16 integer math for gradient brightness scaling instead of
  float32 intermediates
- Update animation type dropdowns and locale strings (en + ru)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/core/processing/color_strip_stream.py

@@ -10,6 +10,7 @@ processing — border extraction, pixel mapping, color correction — runs only
 even when multiple devices share the same source configuration.
 """
 
+import colorsys
 import math
 import threading
 import time
@@ -537,8 +538,18 @@ class StaticColorStripStream(ColorStripStream):
             logger.info("StaticColorStripStream params updated in-place")
 
     def _animate_loop(self) -> None:
-        """Background thread: compute animated colors at ~30 fps when animation is active."""
+        """Background thread: compute animated colors at ~30 fps when animation is active.
+
+        Uses double-buffered output arrays (buf_a / buf_b) to avoid per-frame
+        numpy allocations while preserving the identity check used by the
+        processing loop (``colors is prev_colors``).
+        """
         frame_time = 1.0 / 30
+        # Double-buffer pool — re-allocated only when LED count changes
+        _pool_n = 0
+        _buf_a = _buf_b = None
+        _use_a = True
+
         with high_resolution_timer():
             while self._running:
                 loop_start = time.perf_counter()
@@ -548,13 +559,72 @@ class StaticColorStripStream(ColorStripStream):
                     atype = anim.get("type", "breathing")
                     t = loop_start
                     n = self._led_count
+
+                    if n != _pool_n:
+                        _pool_n = n
+                        _buf_a = np.empty((n, 3), dtype=np.uint8)
+                        _buf_b = np.empty((n, 3), dtype=np.uint8)
+
+                    buf = _buf_a if _use_a else _buf_b
+                    _use_a = not _use_a
                     colors = None
 
                     if atype == "breathing":
                         factor = 0.5 * (1 + math.sin(2 * math.pi * speed * t * 0.5))
-                        base = np.array(self._source_color, dtype=np.float32)
-                        pixel = np.clip(base * factor, 0, 255).astype(np.uint8)
-                        colors = np.tile(pixel, (n, 1))
+                        r, g, b = self._source_color
+                        buf[:] = (min(255, int(r * factor)), min(255, int(g * factor)), min(255, int(b * factor)))
+                        colors = buf
+
+                    elif atype == "strobe":
+                        # Square wave: on for half the period, off for the other half.
+                        # speed=1.0 → 2 flashes/sec (one full on/off cycle per 0.5s)
+                        if math.sin(2 * math.pi * speed * t * 2.0) >= 0:
+                            buf[:] = self._source_color
+                        else:
+                            buf[:] = 0
+                        colors = buf
+
+                    elif atype == "sparkle":
+                        # Random LEDs flash white while the rest stay the base color
+                        buf[:] = self._source_color
+                        density = min(0.5, 0.1 * speed)
+                        mask = np.random.random(n) < density
+                        buf[mask] = (255, 255, 255)
+                        colors = buf
+
+                    elif atype == "pulse":
+                        # Sharp attack, slow exponential decay — heartbeat-like
+                        # speed=1.0 → ~1 pulse per second
+                        phase = (speed * t * 1.0) % 1.0
+                        if phase < 0.1:
+                            factor = phase / 0.1
+                        else:
+                            factor = math.exp(-5.0 * (phase - 0.1))
+                        r, g, b = self._source_color
+                        buf[:] = (min(255, int(r * factor)), min(255, int(g * factor)), min(255, int(b * factor)))
+                        colors = buf
+
+                    elif atype == "candle":
+                        # Random brightness fluctuations simulating a candle flame
+                        base_factor = 0.75
+                        flicker = 0.25 * math.sin(2 * math.pi * speed * t * 3.7)
+                        flicker += 0.15 * math.sin(2 * math.pi * speed * t * 7.3)
+                        flicker += 0.10 * (np.random.random() - 0.5)
+                        factor = max(0.2, min(1.0, base_factor + flicker))
+                        r, g, b = self._source_color
+                        buf[:] = (min(255, int(r * factor)), min(255, int(g * factor)), min(255, int(b * factor)))
+                        colors = buf
+
+                    elif atype == "rainbow_fade":
+                        # Shift hue continuously from the base color
+                        r, g, b = self._source_color
+                        h, s, v = colorsys.rgb_to_hsv(r / 255.0, g / 255.0, b / 255.0)
+                        # speed=1.0 → one full hue rotation every ~10s
+                        h_shift = (speed * t * 0.1) % 1.0
+                        new_h = (h + h_shift) % 1.0
+                        nr, ng, nb = colorsys.hsv_to_rgb(new_h, max(s, 0.5), max(v, 0.3))
+                        buf[:] = (int(nr * 255), int(ng * 255), int(nb * 255))
+                        colors = buf
 
                     if colors is not None:
                         with self._colors_lock:
@@ -652,8 +722,15 @@ class ColorCycleColorStripStream(ColorStripStream):
             logger.info("ColorCycleColorStripStream params updated in-place")
 
     def _animate_loop(self) -> None:
-        """Background thread: interpolate between colors at ~30 fps."""
+        """Background thread: interpolate between colors at ~30 fps.
+
+        Uses double-buffered output arrays to avoid per-frame allocations.
+        """
         frame_time = 1.0 / 30
+        _pool_n = 0
+        _buf_a = _buf_b = None
+        _use_a = True
+
         with high_resolution_timer():
             while self._running:
                 loop_start = time.perf_counter()
@@ -662,17 +739,28 @@ class ColorCycleColorStripStream(ColorStripStream):
                 n = self._led_count
                 num = len(color_list)
                 if num >= 2:
+                    if n != _pool_n:
+                        _pool_n = n
+                        _buf_a = np.empty((n, 3), dtype=np.uint8)
+                        _buf_b = np.empty((n, 3), dtype=np.uint8)
+
+                    buf = _buf_a if _use_a else _buf_b
+                    _use_a = not _use_a
+
                     # 0.05 factor → one full cycle every 20s at speed=1.0
                     cycle_pos = (speed * loop_start * 0.05) % 1.0
                     seg = cycle_pos * num
                     idx = int(seg) % num
-                    t_interp = seg - int(seg)
-                    c1 = np.array(color_list[idx], dtype=np.float32)
-                    c2 = np.array(color_list[(idx + 1) % num], dtype=np.float32)
-                    pixel = np.clip(c1 * (1 - t_interp) + c2 * t_interp, 0, 255).astype(np.uint8)
-                    led_colors = np.tile(pixel, (n, 1))
+                    t_i = seg - int(seg)
+                    c1 = color_list[idx]
+                    c2 = color_list[(idx + 1) % num]
+                    buf[:] = (
+                        min(255, int(c1[0] + (c2[0] - c1[0]) * t_i)),
+                        min(255, int(c1[1] + (c2[1] - c1[1]) * t_i)),
+                        min(255, int(c1[2] + (c2[2] - c1[2]) * t_i)),
+                    )
                     with self._colors_lock:
-                        self._colors = led_colors
+                        self._colors = buf
                 elapsed = time.perf_counter() - loop_start
                 time.sleep(max(frame_time - elapsed, 0.001))
 
@@ -764,11 +852,20 @@ class GradientColorStripStream(ColorStripStream):
             logger.info("GradientColorStripStream params updated in-place")
 
     def _animate_loop(self) -> None:
-        """Background thread: apply animation effects at ~30 fps when animation is active."""
+        """Background thread: apply animation effects at ~30 fps when animation is active.
+
+        Uses double-buffered output arrays plus a uint16 scratch buffer for
+        integer-math brightness scaling, avoiding per-frame numpy allocations.
+        """
         frame_time = 1.0 / 30
         _cached_base: Optional[np.ndarray] = None
         _cached_n: int = 0
         _cached_stops: Optional[list] = None
+        # Double-buffer pool + uint16 scratch for brightness math
+        _pool_n = 0
+        _buf_a = _buf_b = _scratch_u16 = None
+        _use_a = True
+
         with high_resolution_timer():
             while self._running:
                 loop_start = time.perf_counter()
@@ -788,25 +885,98 @@ class GradientColorStripStream(ColorStripStream):
                         _cached_stops = stops
                     base = _cached_base
 
+                    # Re-allocate pool only when LED count changes
+                    if n != _pool_n:
+                        _pool_n = n
+                        _buf_a = np.empty((n, 3), dtype=np.uint8)
+                        _buf_b = np.empty((n, 3), dtype=np.uint8)
+                        _scratch_u16 = np.empty((n, 3), dtype=np.uint16)
+
+                    buf = _buf_a if _use_a else _buf_b
+                    _use_a = not _use_a
+
                     if atype == "breathing":
-                        factor = 0.5 * (1 + math.sin(2 * math.pi * speed * t * 0.5))
-                        colors = np.clip(base.astype(np.float32) * factor, 0, 255).astype(np.uint8)
+                        int_f = max(0, min(256, int(0.5 * (1 + math.sin(2 * math.pi * speed * t * 0.5)) * 256)))
+                        np.copyto(_scratch_u16, base)
+                        _scratch_u16 *= int_f
+                        _scratch_u16 >>= 8
+                        np.copyto(buf, _scratch_u16, casting='unsafe')
+                        colors = buf
 
                     elif atype == "gradient_shift":
                         shift = int(speed * t * 10) % max(n, 1)
-                        colors = np.roll(base, shift, axis=0)
+                        if shift > 0:
+                            buf[:n - shift] = base[shift:]
+                            buf[n - shift:] = base[:shift]
+                        else:
+                            np.copyto(buf, base)
+                        colors = buf
 
                     elif atype == "wave":
                         if n > 1:
                             i_arr = np.arange(n, dtype=np.float32)
                             factor = 0.5 * (1 + np.sin(
-                                2 * math.pi * i_arr / n - 2 * math.pi * speed * t
+                                2 * math.pi * i_arr / n - 2 * math.pi * speed * t * 0.25
                             ))
-                            colors = np.clip(
-                                base.astype(np.float32) * factor[:, None], 0, 255
-                            ).astype(np.uint8)
+                            int_factors = np.clip(factor * 256, 0, 256).astype(np.uint16)
+                            np.copyto(_scratch_u16, base)
+                            _scratch_u16 *= int_factors[:, None]
+                            _scratch_u16 >>= 8
+                            np.copyto(buf, _scratch_u16, casting='unsafe')
+                            colors = buf
                         else:
-                            colors = base
+                            np.copyto(buf, base)
+                            colors = buf
+
+                    elif atype == "strobe":
+                        if math.sin(2 * math.pi * speed * t * 2.0) >= 0:
+                            np.copyto(buf, base)
+                        else:
+                            buf[:] = 0
+                        colors = buf
+
+                    elif atype == "sparkle":
+                        np.copyto(buf, base)
+                        density = min(0.5, 0.1 * speed)
+                        mask = np.random.random(n) < density
+                        buf[mask] = (255, 255, 255)
+                        colors = buf
+
+                    elif atype == "pulse":
+                        phase = (speed * t * 1.0) % 1.0
+                        if phase < 0.1:
+                            factor = phase / 0.1
+                        else:
+                            factor = math.exp(-5.0 * (phase - 0.1))
+                        int_f = max(0, min(256, int(factor * 256)))
+                        np.copyto(_scratch_u16, base)
+                        _scratch_u16 *= int_f
+                        _scratch_u16 >>= 8
+                        np.copyto(buf, _scratch_u16, casting='unsafe')
+                        colors = buf
+
+                    elif atype == "candle":
+                        base_factor = 0.75
+                        flicker = 0.25 * math.sin(2 * math.pi * speed * t * 3.7)
+                        flicker += 0.15 * math.sin(2 * math.pi * speed * t * 7.3)
+                        flicker += 0.10 * (np.random.random() - 0.5)
+                        factor = max(0.2, min(1.0, base_factor + flicker))
+                        int_f = int(factor * 256)
+                        np.copyto(_scratch_u16, base)
+                        _scratch_u16 *= int_f
+                        _scratch_u16 >>= 8
+                        np.copyto(buf, _scratch_u16, casting='unsafe')
+                        colors = buf
+
+                    elif atype == "rainbow_fade":
+                        h_shift = (speed * t * 0.1) % 1.0
+                        for i in range(n):
+                            r, g, b = base[i]
+                            h, s, v = colorsys.rgb_to_hsv(r / 255.0, g / 255.0, b / 255.0)
+                            new_h = (h + h_shift) % 1.0
+                            nr, ng, nb = colorsys.hsv_to_rgb(new_h, max(s, 0.5), max(v, 0.3))
+                            buf[i] = (int(nr * 255), int(ng * 255), int(nb * 255))
+                        colors = buf
 
                     if colors is not None:
                         with self._colors_lock:

server/src/wled_controller/core/processing/wled_target_processor.py

@@ -370,6 +370,11 @@ class WledTargetProcessor(TargetProcessor):
         last_send_time = 0.0
         prev_frame_time_stamp = time.perf_counter()
         loop = asyncio.get_running_loop()
+        # Short re-poll interval when the animation thread hasn't produced a new
+        # frame yet.  The animation thread and this loop both target the same FPS
+        # but are unsynchronised; without a short re-poll the loop can miss a
+        # frame and wait a full frame_time, periodically halving the send rate.
+        SKIP_REPOLL = 0.005  # 5 ms
 
         logger.info(
             f"Processing loop started for target {self._target_id} "
@@ -419,7 +424,7 @@ class WledTargetProcessor(TargetProcessor):
                             while send_timestamps and send_timestamps[0] < now - 1.0:
                                 send_timestamps.popleft()
                             self._metrics.fps_current = len(send_timestamps)
-                            await asyncio.sleep(frame_time)
+                            await asyncio.sleep(SKIP_REPOLL)
                             continue
 
                         prev_colors = colors

server/src/wled_controller/static/js/features/color-strips.js

@@ -57,13 +57,23 @@ export function onCSSTypeChange() {
     if (type === 'static') {
         animSection.style.display = '';
         animTypeSelect.innerHTML =
-            `<option value="breathing">${t('color_strip.animation.type.breathing')}</option>`;
+            `<option value="breathing">${t('color_strip.animation.type.breathing')}</option>` +
+            `<option value="strobe">${t('color_strip.animation.type.strobe')}</option>` +
+            `<option value="sparkle">${t('color_strip.animation.type.sparkle')}</option>` +
+            `<option value="pulse">${t('color_strip.animation.type.pulse')}</option>` +
+            `<option value="candle">${t('color_strip.animation.type.candle')}</option>` +
+            `<option value="rainbow_fade">${t('color_strip.animation.type.rainbow_fade')}</option>`;
     } else if (type === 'gradient') {
         animSection.style.display = '';
         animTypeSelect.innerHTML =
             `<option value="breathing">${t('color_strip.animation.type.breathing')}</option>` +
             `<option value="gradient_shift">${t('color_strip.animation.type.gradient_shift')}</option>` +
-            `<option value="wave">${t('color_strip.animation.type.wave')}</option>`;
+            `<option value="wave">${t('color_strip.animation.type.wave')}</option>` +
+            `<option value="strobe">${t('color_strip.animation.type.strobe')}</option>` +
+            `<option value="sparkle">${t('color_strip.animation.type.sparkle')}</option>` +
+            `<option value="pulse">${t('color_strip.animation.type.pulse')}</option>` +
+            `<option value="candle">${t('color_strip.animation.type.candle')}</option>` +
+            `<option value="rainbow_fade">${t('color_strip.animation.type.rainbow_fade')}</option>`;
     } else {
         animSection.style.display = 'none';
     }

server/src/wled_controller/static/locales/en.json

@@ -596,11 +596,16 @@
   "color_strip.animation.enabled": "Enable Animation:",
   "color_strip.animation.enabled.hint": "Enables procedural animation. The LEDs will update at 30 fps driven by the selected effect.",
   "color_strip.animation.type": "Effect:",
-  "color_strip.animation.type.hint": "The animation effect to apply. Breathing works for both static and gradient sources; Gradient Shift and Wave work for gradient sources only.",
+  "color_strip.animation.type.hint": "The animation effect to apply. Breathing, Strobe, Sparkle, Pulse, Candle, and Rainbow Fade work for both static and gradient sources; Gradient Shift and Wave are gradient-only.",
   "color_strip.animation.type.breathing": "Breathing",
   "color_strip.animation.type.color_cycle": "Color Cycle",
   "color_strip.animation.type.gradient_shift": "Gradient Shift",
   "color_strip.animation.type.wave": "Wave",
+  "color_strip.animation.type.strobe": "Strobe",
+  "color_strip.animation.type.sparkle": "Sparkle",
+  "color_strip.animation.type.pulse": "Pulse",
+  "color_strip.animation.type.candle": "Candle",
+  "color_strip.animation.type.rainbow_fade": "Rainbow Fade",
   "color_strip.animation.speed": "Speed:",
   "color_strip.animation.speed.hint": "Animation speed multiplier. 1.0 ≈ one cycle per second for Breathing; higher values cycle faster.",
   "color_strip.color_cycle.colors": "Colors:",

server/src/wled_controller/static/locales/ru.json

@@ -596,11 +596,16 @@
   "color_strip.animation.enabled": "Включить анимацию:",
   "color_strip.animation.enabled.hint": "Включает процедурную анимацию. Светодиоды обновляются со скоростью 30 кадров в секунду по выбранному эффекту.",
   "color_strip.animation.type": "Эффект:",
-  "color_strip.animation.type.hint": "Эффект анимации. Дыхание работает для статичного цвета и градиента; сдвиг градиента и волна — только для градиентных источников.",
+  "color_strip.animation.type.hint": "Эффект анимации. Дыхание, стробоскоп, искры, пульс, свеча и радужный перелив работают для статического цвета и градиента; сдвиг градиента и волна — только для градиентов.",
   "color_strip.animation.type.breathing": "Дыхание",
   "color_strip.animation.type.color_cycle": "Смена цвета",
   "color_strip.animation.type.gradient_shift": "Сдвиг градиента",
   "color_strip.animation.type.wave": "Волна",
+  "color_strip.animation.type.strobe": "Стробоскоп",
+  "color_strip.animation.type.sparkle": "Искры",
+  "color_strip.animation.type.pulse": "Пульс",
+  "color_strip.animation.type.candle": "Свеча",
+  "color_strip.animation.type.rainbow_fade": "Радужный перелив",
   "color_strip.animation.speed": "Скорость:",
   "color_strip.animation.speed.hint": "Множитель скорости анимации. 1.0 ≈ один цикл в секунду для дыхания; большие значения ускоряют анимацию.",
   "color_strip.color_cycle.colors": "Цвета:",