SDL_FillRect
From SDL Library
SDL_FillRect
Description
This function performs a fast fill of the given rectangle with
color. If dstrect
is NULL, the whole surface will be filled with
color.
The color should be a pixel of the format used by the surface, and
can be generated by the
SDL_MapRGB or SDL_MapRGBA
functions. If the color value contains an alpha value then the
destination is simply "filled" with that alpha information, no blending
takes place.
If there is a clip rectangle set on the destination (set via
SDL_SetClipRect) then this
function will clip based on the intersection of the clip rectangle and
the dstrect rectangle and the dstrect rectangle
will be modified to represent the area actually filled.