Add addressable_light display platform (#1272)

esphome/components/addressable_light/addressable_light_display.cpp

@@ -0,0 +1,67 @@
+#include "addressable_light_display.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace addressable_light {
+
+static const char* TAG = "addressable_light.display";
+
+int AddressableLightDisplay::get_width_internal() { return this->width_; }
+int AddressableLightDisplay::get_height_internal() { return this->height_; }
+
+void AddressableLightDisplay::setup() {
+  this->addressable_light_buffer_.resize(this->width_ * this->height_, {0, 0, 0, 0});
+}
+
+void AddressableLightDisplay::update() {
+  if (!this->enabled_)
+    return;
+
+  this->do_update_();
+  this->display();
+}
+
+void AddressableLightDisplay::display() {
+  bool dirty = false;
+  uint8_t old_r, old_g, old_b, old_w;
+  Color* c;
+
+  for (uint32_t offset = 0; offset < this->addressable_light_buffer_.size(); offset++) {
+    c = &(this->addressable_light_buffer_[offset]);
+
+    light::ESPColorView pixel = (*this->light_)[offset];
+
+    // Track the original values for the pixel view. If it has changed updating, then
+    // we trigger a redraw. Avoiding redraws == avoiding flicker!
+    old_r = pixel.get_red();
+    old_g = pixel.get_green();
+    old_b = pixel.get_blue();
+    old_w = pixel.get_white();
+
+    pixel.set_rgbw(c->r, c->g, c->b, c->w);
+
+    // If the actual value of the pixel changed, then schedule a redraw.
+    if (pixel.get_red() != old_r || pixel.get_green() != old_g || pixel.get_blue() != old_b ||
+        pixel.get_white() != old_w) {
+      dirty = true;
+    }
+  }
+
+  if (dirty) {
+    this->light_->schedule_show();
+  }
+}
+
+void HOT AddressableLightDisplay::draw_absolute_pixel_internal(int x, int y, Color color) {
+  if (x >= this->get_width_internal() || x < 0 || y >= this->get_height_internal() || y < 0)
+    return;
+
+  if (this->pixel_mapper_f_.has_value()) {
+    // Params are passed by reference, so they may be modified in call.
+    this->addressable_light_buffer_[(*this->pixel_mapper_f_)(x, y)] = color;
+  } else {
+    this->addressable_light_buffer_[y * this->get_width_internal() + x] = color;
+  }
+}
+}  // namespace addressable_light
+}  // namespace esphome