display_buffer.cpp

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#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) {
  ExternalRAMAllocator<uint8_t> allocator(ExternalRAMAllocator<uint8_t>::ALLOW_FAILURE);
  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