Function encodeWithState

external/lodepng/examples/example_encode.c:72–89

Example 3 Save a PNG file to disk using a State, normally needed for more advanced usage. The image argument has width * height RGBA pixels or width * height * 4 bytes */

The image argument has width * height RGBA pixels or width * height * 4 bytes
*/
void encodeWithState(const char* filename, const unsigned char* image, unsigned width, unsigned height) {
  unsigned error;
  unsigned char* png;
  size_t pngsize;
  LodePNGState state;

  lodepng_state_init(&state);
  /*optionally customize the state*/

  error = lodepng_encode(&png, &pngsize, image, width, height, &state);
  if(!error) lodepng_save_file(png, pngsize, filename);

  /*if there's an error, display it*/
  if(error) printf("error %u: %s\n", error, lodepng_error_text(error));

  lodepng_state_cleanup(&state);
  free(png);
}

int main(int argc, char *argv[]) {
  const char* filename = argc > 1 ? argv[1] : "test.png";