Function lodepng_decode

depends/lodepng/lodepng.cpp:4951–4986

}

unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h,
                        LodePNGState* state,
                        const unsigned char* in, size_t insize) {
  *out = 0;
  decodeGeneric(out, w, h, state, in, insize);
  if(state->error) return state->error;
  if(!state->decoder.color_convert || lodepng_color_mode_equal(&state->info_raw, &state->info_png.color)) {
    /*same color type, no copying or converting of data needed*/
    /*store the info_png color settings on the info_raw so that the info_raw still reflects what colortype
    the raw image has to the end user*/
    if(!state->decoder.color_convert) {
      state->error = lodepng_color_mode_copy(&state->info_raw, &state->info_png.color);
      if(state->error) return state->error;
    }
  } else { /*color conversion needed*/
    unsigned char* data = *out;
    size_t outsize;

    /*TODO: check if this works according to the statement in the documentation: "The converter can convert
    from grayscale input color type, to 8-bit grayscale or grayscale with alpha"*/
    if(!(state->info_raw.colortype == LCT_RGB || state->info_raw.colortype == LCT_RGBA)
       && !(state->info_raw.bitdepth == 8)) {
      return 56; /*unsupported color mode conversion*/
    }

    outsize = lodepng_get_raw_size(*w, *h, &state->info_raw);
    *out = (unsigned char*)lodepng_malloc(outsize);
    if(!(*out)) {
      state->error = 83; /*alloc fail*/
    }
    else state->error = lodepng_convert(*out, data, &state->info_raw,
                                        &state->info_png.color, *w, *h);
    lodepng_free(data);
  }
  return state->error;
}

unsigned lodepng_decode_memory(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in,
                               size_t insize, LodePNGColorType colortype, unsigned bitdepth) {