gif.h

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#pragma once
 
#ifdef USE_HOST
#include <cstddef>
#include <cstdint>
#include <cstdio>
#include <vector>
 
namespace esphome::snapshot {
 
class GifWriter {
 public:
  GifWriter(FILE *file, int width, int height);
 
  bool write_header();
  bool write_frame(const uint8_t *bgr, size_t row_stride, unsigned delay_centiseconds);
  bool write_trailer();
 
 protected:
  struct ColorBin {
    uint64_t sum[3];
    uint32_t count;
  };
 
  size_t build_palette_(uint8_t *palette);
 
  FILE *file_;
  int width_;
  int height_;
  std::vector<ColorBin> bins_;
  std::vector<uint16_t> used_colors_;
  std::vector<uint8_t> palette_index_;
  std::vector<uint8_t> indices_;
  std::vector<uint8_t> output_;
};
 
}  // namespace esphome::snapshot
 
#endif