Get the height of an RTF render area given a certain width.
int RTF_GetHeight(RTF_Context *ctx, int width);
|ctx||the RTF context to query.|
|width||the width, in pixels, to use for text flow.|
Returns the height, in pixels, of an RTF render area.
The text is automatically reflowed to this new width, and should match the width of the clipping rectangle used for rendering later.
This function is available since SDL_rtf 3.0.0.