20260326

esphome/components/display/display_buffer.cpp

@@ -0,0 +1,72 @@
+#include "display_buffer.h"
+
+#include <utility>
+
+#include "esphome/core/application.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace display {
+
+static const char *const TAG = "display";
+
+void DisplayBuffer::init_internal_(uint32_t buffer_length) {
+  RAMAllocator<uint8_t> allocator;
+  this->buffer_ = allocator.allocate(buffer_length);
+  if (this->buffer_ == nullptr) {
+    ESP_LOGE(TAG, "Could not allocate buffer for display!");
+    return;
+  }
+  this->clear();
+}
+
+int DisplayBuffer::get_width() {
+  switch (this->rotation_) {
+    case DISPLAY_ROTATION_90_DEGREES:
+    case DISPLAY_ROTATION_270_DEGREES:
+      return this->get_height_internal();
+    case DISPLAY_ROTATION_0_DEGREES:
+    case DISPLAY_ROTATION_180_DEGREES:
+    default:
+      return this->get_width_internal();
+  }
+}
+
+int DisplayBuffer::get_height() {
+  switch (this->rotation_) {
+    case DISPLAY_ROTATION_0_DEGREES:
+    case DISPLAY_ROTATION_180_DEGREES:
+      return this->get_height_internal();
+    case DISPLAY_ROTATION_90_DEGREES:
+    case DISPLAY_ROTATION_270_DEGREES:
+    default:
+      return this->get_width_internal();
+  }
+}
+
+void HOT DisplayBuffer::draw_pixel_at(int x, int y, Color color) {
+  if (!this->get_clipping().inside(x, y))
+    return;  // NOLINT
+
+  switch (this->rotation_) {
+    case DISPLAY_ROTATION_0_DEGREES:
+      break;
+    case DISPLAY_ROTATION_90_DEGREES:
+      std::swap(x, y);
+      x = this->get_width_internal() - x - 1;
+      break;
+    case DISPLAY_ROTATION_180_DEGREES:
+      x = this->get_width_internal() - x - 1;
+      y = this->get_height_internal() - y - 1;
+      break;
+    case DISPLAY_ROTATION_270_DEGREES:
+      std::swap(x, y);
+      y = this->get_height_internal() - y - 1;
+      break;
+  }
+  this->draw_absolute_pixel_internal(x, y, color);
+  App.feed_wdt();
+}
+
+}  // namespace display
+}  // namespace esphome