plsmema: Set the memory area to be plotted (RGBA)

`plsmema`: Set the memory area to be plotted (RGBA)
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#### `plsmema`: Set the memory area to be plotted (RGBA)

`plsmema (` | maxx,
| maxy,
| plotmem`)`;

Set the memory area to be plotted (with the “memcairo” driver) as the `dev` member of the stream structure. Also set the number of pixels in the memory passed in `plotmem`, which is a block of memory `maxy` by `maxx` by 4 bytes long, say: 480 x 640 x 4 (Y, X, RGBA)

This memory will have to be freed by the user!

`maxx` (`PLINT`, input)

  Size of memory area in the X coordinate.

`maxy` (`PLINT`, input)

  Size of memory area in the Y coordinate.

`plotmem` (`void *`, input)

  Pointer to the beginning of the user-supplied memory area.

Redacted form: `plsmema(maxx, maxy, plotmem)`

This function is not used in any examples.

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