Draws a horizontal line onto the bitmap.


void hline(BITMAP *bmp, int x1, int y, int x2, int color);
Draws a horizontal line onto the bitmap, from point (x1, y) to (x2, y).

Note: hline() is implemented as an alias to another function. See ALLEGRO_NO_VHLINE_ALIAS in the `Differences between platforms' section for details.
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