bmp_decoder.h

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#pragma once
 
#include "esphome/core/defines.h"
#ifdef USE_RUNTIME_IMAGE_BMP
 
#include <algorithm>
#include <memory>
 
#include "image_decoder.h"
#include "runtime_image.h"
 
namespace esphome::runtime_image {
 
class BmpDecoder : public ImageDecoder {
 public:
  BmpDecoder(RuntimeImage *image) : ImageDecoder(image) {}
 
  int HOT decode(uint8_t *buffer, size_t size) override;
 
  bool is_finished() const override {
    if (this->bits_per_pixel_ == 0) {
      // header not yet received, so dimensions not yet determined
      return false;
    }
    // BMP is finished when we've decoded all pixel data
    return this->paint_index_ >= static_cast<size_t>(this->width_ * this->height_);
  }
 
 protected:
  size_t current_index_{0};
  size_t paint_index_{0};
  ssize_t width_{0};
  ssize_t height_{0};
  uint16_t bits_per_pixel_{0};
  uint32_t compression_method_{0};
  uint32_t image_data_size_{0};
  uint32_t color_table_entries_{0};
  std::unique_ptr<uint32_t[]> color_table_;
  size_t width_bytes_{0};
  size_t data_offset_{0};
  uint8_t padding_bytes_{0};
};
 
}  // namespace esphome::runtime_image
 
#endif  // USE_RUNTIME_IMAGE_BMP