5 files changed, 123 insertions, 15 deletions

diff --git a/docs/feature_rgb_matrix.md b/docs/feature_rgb_matrix.md
index 5eb9d5536..1e4341467 100644
--- a/docs/feature_rgb_matrix.md
+++ b/docs/feature_rgb_matrix.md
@@ -201,7 +201,10 @@ enum rgb_matrix_effects {
     RGB_MATRIX_RAINBOW_PINWHEELS,   // Full dual gradients spinning two halfs of keyboard
     RGB_MATRIX_RAINDROPS,           // Randomly changes a single key's hue
     RGB_MATRIX_JELLYBEAN_RAINDROPS, // Randomly changes a single key's hue and saturation
+#if define(RGB_MATRIX_FRAMEBUFFER_EFFECTS)
+    RGB_MATRIX_TYPING_HEATMAP,      // How hot is your WPM!
     RGB_MATRIX_DIGITAL_RAIN,        // That famous computer simulation
+#endif
 #if defined(RGB_MATRIX_KEYPRESSES) || defined(RGB_MATRIX_KEYRELEASES)
     RGB_MATRIX_SOLID_REACTIVE_SIMPLE,   // Pulses keys hit to hue & value then fades value out
     RGB_MATRIX_SOLID_REACTIVE,      // Static single hue, pulses keys hit to shifted hue then fades to current hue
@@ -237,6 +240,7 @@ You can disable a single effect by defining `DISABLE_[EFFECT_NAME]` in your `con
 |`#define DISABLE_RGB_MATRIX_RAINBOW_PINWHEELS`         |Disables `RGB_MATRIX_RAINBOW_PINWHEELS`        |
 |`#define DISABLE_RGB_MATRIX_RAINDROPS`                 |Disables `RGB_MATRIX_RAINDROPS`                |
 |`#define DISABLE_RGB_MATRIX_JELLYBEAN_RAINDROPS`       |Disables `RGB_MATRIX_JELLYBEAN_RAINDROPS`      |
+|`#define DISABLE_RGB_MATRIX_TYPING_HEATMAP`            |Disables `RGB_MATRIX_TYPING_HEATMAP`           |
 |`#define DISABLE_RGB_MATRIX_DIGITAL_RAIN`              |Disables `RGB_MATRIX_DIGITAL_RAIN`             |
 |`#define DISABLE_RGB_MATRIX_SOLID_REACTIVE`            |Disables `RGB_MATRIX_SOLID_REACTIVE`           |
 |`#define DISABLE_RGB_MATRIX_SOLID_REACTIVE_SIMPLE`     |Disables `RGB_MATRIX_SOLID_REACTIVE_SIMPLE`    |
diff --git a/quantum/rgb_matrix.c b/quantum/rgb_matrix.c
index edbcee9cd..92a94df80 100644
--- a/quantum/rgb_matrix.c
+++ b/quantum/rgb_matrix.c
@@ -38,6 +38,7 @@
 #include "rgb_matrix_animations/rainbow_pinwheels_anim.h"
 #include "rgb_matrix_animations/rainbow_moving_chevron_anim.h"
 #include "rgb_matrix_animations/jellybean_raindrops_anim.h"
+#include "rgb_matrix_animations/typing_heatmap_anim.h"
 #include "rgb_matrix_animations/digital_rain_anim.h"
 #include "rgb_matrix_animations/solid_reactive_simple_anim.h"
 #include "rgb_matrix_animations/solid_reactive_anim.h"
@@ -111,6 +112,10 @@ rgb_config_t rgb_matrix_config;
 rgb_counters_t g_rgb_counters;
 static uint32_t rgb_counters_buffer;
 
+#ifdef RGB_MATRIX_FRAMEBUFFER_EFFECTS
+uint8_t rgb_frame_buffer[MATRIX_ROWS][MATRIX_COLS] = {{0}};
+#endif
+
 #ifdef RGB_MATRIX_KEYREACTIVE_ENABLED
   last_hit_t g_last_hit_tracker;
   static last_hit_t last_hit_buffer;
@@ -206,6 +211,13 @@ bool process_rgb_matrix(uint16_t keycode, keyrecord_t *record) {
     last_hit_buffer.count++;
   }
 #endif // RGB_MATRIX_KEYREACTIVE_ENABLED
+
+#if defined(RGB_MATRIX_FRAMEBUFFER_EFFECTS) && !defined(DISABLE_RGB_MATRIX_TYPING_HEATMAP)
+  if (rgb_matrix_config.mode == RGB_MATRIX_TYPING_HEATMAP) {
+    process_rgb_matrix_typing_heatmap(record);
+  }
+#endif // defined(RGB_MATRIX_FRAMEBUFFER_EFFECTS) && !defined(DISABLE_RGB_MATRIX_TYPING_HEATMAP)
+
   return true;
 }
 
@@ -370,11 +382,20 @@ static void rgb_task_render(uint8_t effect) {
       rendering = rgb_matrix_jellybean_raindrops(&rgb_effect_params);   // Max 1ms Avg 0ms
       break;
 #endif // DISABLE_RGB_MATRIX_JELLYBEAN_RAINDROPS
+
+#ifdef RGB_MATRIX_FRAMEBUFFER_EFFECTS
+#ifndef DISABLE_RGB_MATRIX_TYPING_HEATMAP
+    case RGB_MATRIX_TYPING_HEATMAP:
+      rendering = rgb_matrix_typing_heatmap(&rgb_effect_params);        // Max 4ms Avg 3ms
+      break;
+#endif // DISABLE_RGB_MATRIX_TYPING_HEATMAP
 #ifndef DISABLE_RGB_MATRIX_DIGITAL_RAIN
     case RGB_MATRIX_DIGITAL_RAIN:
       rendering = rgb_matrix_digital_rain(&rgb_effect_params);         // Max 9ms Avg 8ms | this is expensive, fix it
       break;
 #endif // DISABLE_RGB_MATRIX_DIGITAL_RAIN
+#endif // RGB_MATRIX_FRAMEBUFFER_EFFECTS
+
 #ifdef RGB_MATRIX_KEYREACTIVE_ENABLED
 #ifndef DISABLE_RGB_MATRIX_SOLID_REACTIVE_SIMPLE
     case RGB_MATRIX_SOLID_REACTIVE_SIMPLE:
diff --git a/quantum/rgb_matrix.h b/quantum/rgb_matrix.h
index 365a92bbf..add0715d9 100644
--- a/quantum/rgb_matrix.h
+++ b/quantum/rgb_matrix.h
@@ -101,9 +101,14 @@ enum rgb_matrix_effects {
 #ifndef DISABLE_RGB_MATRIX_JELLYBEAN_RAINDROPS
   RGB_MATRIX_JELLYBEAN_RAINDROPS,
 #endif // DISABLE_RGB_MATRIX_JELLYBEAN_RAINDROPS
+#ifdef RGB_MATRIX_FRAMEBUFFER_EFFECTS
+#ifndef DISABLE_RGB_MATRIX_TYPING_HEATMAP
+  RGB_MATRIX_TYPING_HEATMAP,
+#endif // DISABLE_RGB_MATRIX_TYPING_HEATMAP
 #ifndef DISABLE_RGB_MATRIX_DIGITAL_RAIN
   RGB_MATRIX_DIGITAL_RAIN,
 #endif // DISABLE_RGB_MATRIX_DIGITAL_RAIN
+#endif // RGB_MATRIX_FRAMEBUFFER_EFFECTS
 #ifdef RGB_MATRIX_KEYREACTIVE_ENABLED
 #ifndef DISABLE_RGB_MATRIX_SOLID_REACTIVE_SIMPLE
   RGB_MATRIX_SOLID_REACTIVE_SIMPLE,
diff --git a/quantum/rgb_matrix_animations/digital_rain_anim.h b/quantum/rgb_matrix_animations/digital_rain_anim.h
index 4ba3c1c87..6ccba392a 100644
--- a/quantum/rgb_matrix_animations/digital_rain_anim.h
+++ b/quantum/rgb_matrix_animations/digital_rain_anim.h
@@ -1,11 +1,13 @@
 #pragma once
-#ifndef DISABLE_RGB_MATRIX_DIGITAL_RAIN
+#if defined(RGB_MATRIX_FRAMEBUFFER_EFFECTS) && !defined(DISABLE_RGB_MATRIX_DIGITAL_RAIN)
 
 #ifndef RGB_DIGITAL_RAIN_DROPS
     // lower the number for denser effect/wider keyboard
     #define RGB_DIGITAL_RAIN_DROPS 24
 #endif
 
+extern uint8_t rgb_frame_buffer[MATRIX_ROWS][MATRIX_COLS];
+
 bool rgb_matrix_digital_rain(effect_params_t* params) {
   // algorithm ported from https://github.com/tremby/Kaleidoscope-LEDEffect-DigitalRain
   const uint8_t drop_ticks           = 28;
@@ -13,24 +15,24 @@ bool rgb_matrix_digital_rain(effect_params_t* params) {
   const uint8_t max_brightness_boost = 0xc0;
   const uint8_t max_intensity        = 0xff;
 
-  static uint8_t map[MATRIX_COLS][MATRIX_ROWS] = {{0}};
   static uint8_t drop = 0;
 
   if (params->init) {
     rgb_matrix_set_color_all(0, 0, 0);
-    memset(map, 0, sizeof map);
+    memset(rgb_frame_buffer, 0, sizeof rgb_frame_buffer);
     drop = 0;
   }
+
   for (uint8_t col = 0; col < MATRIX_COLS; col++) {
     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
       if (row == 0 && drop == 0 && rand() < RAND_MAX / RGB_DIGITAL_RAIN_DROPS) {
         // top row, pixels have just fallen and we're
         // making a new rain drop in this column
-        map[col][row] = max_intensity;
+        rgb_frame_buffer[col][row] = max_intensity;
       }
-      else if (map[col][row] > 0 && map[col][row] < max_intensity) {
+      else if (rgb_frame_buffer[col][row] > 0 && rgb_frame_buffer[col][row] < max_intensity) {
         // neither fully bright nor dark, decay it
-        map[col][row]--;
+        rgb_frame_buffer[col][row]--;
       }
       // set the pixel colour
       uint8_t led[LED_HITS_TO_REMEMBER];
@@ -38,32 +40,33 @@ bool rgb_matrix_digital_rain(effect_params_t* params) {
 
       // TODO: multiple leds are supported mapped to the same row/column
       if (led_count > 0) {
-        if (map[col][row] > pure_green_intensity) {
-          const uint8_t boost = (uint8_t) ((uint16_t) max_brightness_boost * (map[col][row] - pure_green_intensity) / (max_intensity - pure_green_intensity));
+        if (rgb_frame_buffer[col][row] > pure_green_intensity) {
+          const uint8_t boost = (uint8_t) ((uint16_t) max_brightness_boost * (rgb_frame_buffer[col][row] - pure_green_intensity) / (max_intensity - pure_green_intensity));
           rgb_matrix_set_color(led[0], boost, max_intensity, boost);
         }
         else {
-          const uint8_t green = (uint8_t) ((uint16_t) max_intensity * map[col][row] / pure_green_intensity);
+          const uint8_t green = (uint8_t) ((uint16_t) max_intensity * rgb_frame_buffer[col][row] / pure_green_intensity);
           rgb_matrix_set_color(led[0], 0, green, 0);
         }
       }
     }
   }
+
   if (++drop > drop_ticks) {
     // reset drop timer
     drop = 0;
     for (uint8_t row = MATRIX_ROWS - 1; row > 0; row--) {
       for (uint8_t col = 0; col < MATRIX_COLS; col++) {
         // if ths is on the bottom row and bright allow decay
-        if (row == MATRIX_ROWS - 1 && map[col][row] == max_intensity) {
-          map[col][row]--;
+        if (row == MATRIX_ROWS - 1 && rgb_frame_buffer[col][row] == max_intensity) {
+          rgb_frame_buffer[col][row]--;
         }
         // check if the pixel above is bright
-        if (map[col][row - 1] == max_intensity) {
+        if (rgb_frame_buffer[col][row - 1] == max_intensity) {
           // allow old bright pixel to decay
-          map[col][row - 1]--;
+          rgb_frame_buffer[col][row - 1]--;
           // make this pixel bright
-          map[col][row] = max_intensity;
+          rgb_frame_buffer[col][row] = max_intensity;
         }
       }
     }
@@ -71,4 +74,4 @@ bool rgb_matrix_digital_rain(effect_params_t* params) {
   return false;
 }
 
-#endif // DISABLE_RGB_MATRIX_DIGITAL_RAIN
+#endif // defined(RGB_MATRIX_FRAMEBUFFER_EFFECTS) && !defined(DISABLE_RGB_MATRIX_DIGITAL_RAIN)
diff --git a/quantum/rgb_matrix_animations/typing_heatmap_anim.h b/quantum/rgb_matrix_animations/typing_heatmap_anim.h
new file mode 100644
index 000000000..aade53fcc
--- /dev/null
+++ b/quantum/rgb_matrix_animations/typing_heatmap_anim.h
@@ -0,0 +1,75 @@
+#pragma once
+#if defined(RGB_MATRIX_FRAMEBUFFER_EFFECTS) && !defined(DISABLE_RGB_MATRIX_TYPING_HEATMAP)
+
+extern rgb_config_t rgb_matrix_config;
+extern uint8_t rgb_frame_buffer[MATRIX_ROWS][MATRIX_COLS];
+
+void process_rgb_matrix_typing_heatmap(keyrecord_t *record) {
+    uint8_t row = record->event.key.row;
+    uint8_t col = record->event.key.col;
+    uint8_t m_row = row - 1;
+    uint8_t p_row = row + 1;
+    uint8_t m_col = col - 1;
+    uint8_t p_col = col + 1;
+
+    if (m_col < col)
+      rgb_frame_buffer[row][m_col] = qadd8(rgb_frame_buffer[row][m_col], 16);
+    rgb_frame_buffer[row][col] = qadd8(rgb_frame_buffer[row][col], 32);
+    if (p_col < MATRIX_COLS)
+      rgb_frame_buffer[row][p_col] = qadd8(rgb_frame_buffer[row][p_col], 16);
+
+    if (p_row < MATRIX_ROWS) {
+      if (m_col < col)
+        rgb_frame_buffer[p_row][m_col] = qadd8(rgb_frame_buffer[p_row][m_col], 13);
+      rgb_frame_buffer[p_row][col] = qadd8(rgb_frame_buffer[p_row][col], 16);
+      if (p_col < MATRIX_COLS)
+        rgb_frame_buffer[p_row][p_col] = qadd8(rgb_frame_buffer[p_row][p_col], 13);
+    }
+
+    if (m_row < row) {
+      if (m_col < col)
+        rgb_frame_buffer[m_row][m_col] = qadd8(rgb_frame_buffer[m_row][m_col], 13);
+      rgb_frame_buffer[m_row][col] = qadd8(rgb_frame_buffer[m_row][col], 16);
+      if (p_col < MATRIX_COLS)
+        rgb_frame_buffer[m_row][p_col] = qadd8(rgb_frame_buffer[m_row][p_col], 13);
+    }
+}
+
+bool rgb_matrix_typing_heatmap(effect_params_t* params) {
+  // Modified version of RGB_MATRIX_USE_LIMITS to work off of matrix row / col size
+  uint8_t led_min = RGB_MATRIX_LED_PROCESS_LIMIT * params->iter;
+  uint8_t led_max = led_min + RGB_MATRIX_LED_PROCESS_LIMIT;
+  if (led_max > sizeof(rgb_frame_buffer))
+    led_max = sizeof(rgb_frame_buffer);
+
+  if (params->init) {
+    rgb_matrix_set_color_all(0, 0, 0);
+    memset(rgb_frame_buffer, 0, sizeof rgb_frame_buffer);
+  }
+
+  // Render heatmap & decrease
+  for (int i = led_min; i < led_max; i++) {
+    uint8_t row = i % MATRIX_ROWS;
+    uint8_t col = i / MATRIX_ROWS;
+    uint8_t val = rgb_frame_buffer[row][col];
+
+    // set the pixel colour
+    uint8_t led[LED_HITS_TO_REMEMBER];
+    uint8_t led_count = rgb_matrix_map_row_column_to_led(row, col, led);
+    for (uint8_t j = 0; j < led_count; ++j)
+    {
+      if (!HAS_ANY_FLAGS(g_led_config.flags[led[j]], params->flags))
+        continue;
+
+      HSV hsv = { 170 - qsub8(val, 85), rgb_matrix_config.sat, scale8((qadd8(170, val) - 170) * 3, rgb_matrix_config.val) };
+      RGB rgb = hsv_to_rgb(hsv);
+      rgb_matrix_set_color(led[j], rgb.r, rgb.g, rgb.b);
+    }
+
+    rgb_frame_buffer[row][col] = qsub8(val, 1);
+  }
+
+  return led_max < sizeof(rgb_frame_buffer);
+}
+
+#endif // defined(RGB_MATRIX_FRAMEBUFFER_EFFECTS) && !defined(DISABLE_RGB_MATRIX_TYPING_HEATMAP)