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How to use cb_png_write method in fMBT

Best Python code snippet using fMBT_python

fmbtpng.py

Source:fmbtpng.py

...93        libpng.png_create_info_struct(png_struct))94    if not info_struct:95        libpng.png_destroy_write_struct(png_struct, ctypes.c_void_p(0))96        raise PngError("png_create_info_struct failed")97    def cb_png_write(png_struct, data, datalen):98        png_data.append(ctypes.string_at(data, datalen))99    c_cb_png_write = ctypes.CFUNCTYPE(None, ctypes.c_void_p, ctypes.c_void_p,100                                      ctypes.c_size_t)(cb_png_write)101    libpng.png_set_write_fn(png_struct, NULL, c_cb_png_write, NULL)102    if isinstance(data, str):103        buf = ctypes.c_buffer(data)104    else:105        buf = data.contents106    fmt = fmt.upper()107    if fmt == "RGB":108        color_type = PNG_COLOR_TYPE_RGB109        bytes_per_pixel = (depth / 8) * 3110    elif fmt == "RGB565":111        color_type = PNG_COLOR_TYPE_RGB...

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