Function lodepng_decode

dependency/densecrf/examples/lodepng.cpp:4717–4760

}

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; sort of copy of the data*/
        unsigned char* data = *out;
        size_t outsize;
        
        /*TODO: check if this works according to the statement in the documentation: "The converter can convert
         from greyscale input color type, to 8-bit greyscale or greyscale 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)