indexed_png.h

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#ifndef YAZE_UTIL_INDEXED_PNG_H
#define YAZE_UTIL_INDEXED_PNG_H
 
#include <array>
#include <cstdint>
#include <string>
#include <vector>
 
#include "absl/status/statusor.h"
 
namespace yaze::util {
 
struct PngImage {
  int width = 0;
  int height = 0;
  bool indexed = false;
  // indexed: one palette index per pixel.
  std::vector<uint8_t> indices;
  // indexed: PLTE entries with tRNS alpha (255 when absent).
  std::vector<std::array<uint8_t, 4>> palette;
  // not indexed: 4 bytes (RGBA) per pixel.
  std::vector<uint8_t> rgba;
};
 
absl::StatusOr<std::vector<uint8_t>> EncodeIndexedPng(
    int width, int height, const std::vector<uint8_t>& indices,
    const std::vector<std::array<uint8_t, 4>>& palette);
 
absl::StatusOr<PngImage> DecodePng(const std::vector<uint8_t>& bytes);
 
absl::StatusOr<std::vector<uint8_t>> ReadBinaryFile(const std::string& path);
absl::Status WriteBinaryFile(const std::string& path,
                             const std::vector<uint8_t>& bytes);
 
}  // namespace yaze::util
 
#endif  // YAZE_UTIL_INDEXED_PNG_H