fix: the correct should be (*buffer)[3]

src/write_png.c

@@ -10,7 +10,7 @@ static inline double linear_to_srgb(double x){
   return 1.055 * pow(x, 1.0/2.4) - 0.055;
 }
 
-int buffer_normalize_srgb(double *buffer[3], int W, int H) {
+int buffer_normalize_srgb(double (*buffer)[3], int W, int H) {
   double max = 0;
   for (int j = 0; j < H; j++) {
     for (int i = 0; i < W; i++) {
@@ -31,7 +31,7 @@ int buffer_normalize_srgb(double *buffer[3], int W, int H) {
   return 0;
 }
 
-int write_png(char *filename, double *buffer[3], int W, int H) {
+int write_png(char *filename, double (*buffer)[3], int W, int H) {
   buffer_normalize_srgb(buffer, W, H);
   size_t bufsize = W*H*3;
   uint8_t *img = (uint8_t *)malloc(bufsize);