view src/video/SDL_blendline.c @ 2888:32e8bbba1e94

Added stubs for software implementations of blending fills and line drawing
author Sam Lantinga <slouken@libsdl.org>
date Sat, 20 Dec 2008 13:14:28 +0000
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children 1ef2f1e75ff7
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#include "SDL_video.h"
#include "SDL_blit.h"


int
SDL_BlendLine(SDL_Surface * dst, int x1, int y1, int x2, int y2,
              int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
    /* This function doesn't work on surfaces < 8 bpp */
    if (dst->format->BitsPerPixel < 8) {
        SDL_SetError("SDL_BlendLine(): Unsupported surface format");
        return (-1);
    }

    /* Perform clipping */
    /* FIXME
       if (!SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect)) {
       return (0);
       }
     */

    SDL_Unsupported();
    return -1;
}

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