SDL Wiki
(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)


Perform a fast fill of a rectangle with a specific color.


int SDL_FillRect
    (SDL_Surface * dst, const SDL_Rect * rect, Uint32 color);

Function Parameters


the SDL_Surface structure that is the drawing target


the SDL_Rect structure representing the rectangle to fill, or NULL to fill the entire surface


the color to fill with

Return Value

Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.


color should be a pixel of the format used by the surface, and can be generated by SDL_MapRGB() or SDL_MapRGBA(). If the color value contains an alpha component 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 fill based on the intersection of the clip rectangle and rect.


This function is available since SDL 3.0.0.

Code Examples

/* Declaring the surface. */
SDL_Surface *s;

/* Creating the surface. */
s = SDL_CreateRGBSurface(0, width, height, 32, 0, 0, 0, 0);

/* Filling the surface with red color. */
SDL_FillRect(s, NULL, SDL_MapRGB(s->format, 255, 0, 0));

CategoryAPI, CategorySurface

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