1) Code is splitted into 3 sections:
- draw `under` texture;
- draw `progress` texture + draw radial modes reference cross;
- draw `over` texture.
Each draw texture section handles nine-patch stretching. Except for the progress texture in radial modes, which does not support nine-patch stretching.
2) The reference cross position now is not misaligned to real center position (`floor()` call removed).
3) The reference cross drawing code is additionally surrounded by `TOOLS_ENABLED` check.
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