gpu: ipu-v3: image-convert: add some ASCII art to the exposition

 * when double_buffering boolean is set).

 *

 * Note that the input frame must be split up into the same number

 * of tiles as the output frame.

 * of tiles as the output frame:

 *

 * FIXME: at this point there is no attempt to deal with visible seams

 * at the tile boundaries when upscaling. The seams are caused by a reset

 * of the bilinear upscale interpolation when starting a new tile. The

 * seams are barely visible for small upscale factors, but become

 * increasingly visible as the upscale factor gets larger, since more

 * interpolated pixels get thrown out at the tile boundaries. A possilble

 * fix might be to overlap tiles of different sizes, but this must be done

 * while also maintaining the IDMAC dma buffer address alignment and 8x8 IRT

 * alignment restrictions of each tile.

 *                       +---------+-----+

 *   +-----+---+         |  A      | B   |

 *   | A   | B |         |         |     |

 *   +-----+---+   -->   +---------+-----+

 *   | C   | D |         |  C      | D   |

 *   +-----+---+         |         |     |

 *                       +---------+-----+

 *

 * Clockwise 90° rotations are handled by first rescaling into a

 * reusable temporary tile buffer and then rotating with the 8x8

 * block rotator, writing to the correct destination:

 *

 *                                         +-----+-----+

 *                                         |     |     |

 *   +-----+---+         +---------+       | C   | A   |

 *   | A   | B |         | A,B, |  |       |     |     |

 *   +-----+---+   -->   | C,D  |  |  -->  |     |     |

 *   | C   | D |         +---------+       +-----+-----+

 *   +-----+---+                           | D   | B   |

 *                                         |     |     |

 *                                         +-----+-----+

 *

 * If the 8x8 block rotator is used, horizontal or vertical flipping

 * is done during the rotation step, otherwise flipping is done

 * during the scaling step.

 * With rotation or flipping, tile order changes between input and

 * output image. Tiles are numbered row major from top left to bottom

 * right for both input and output image.

 */

#define MAX_STRIPES_W    4