libs/SDL/GP_SDL_Context.c

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   4  * Gfxprim is free software; you can redistribute it and/or                  *
   5  * modify it under the terms of the GNU Lesser General Public                *
   6  * License as published by the Free Software Foundation; either              *
   7  * version 2.1 of the License, or (at your option) any later version.        *
   8  *                                                                           *
   9  * Gfxprim is distributed in the hope that it will be useful,                *
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
  12  * Lesser General Public License for more details.                           *
  13  *                                                                           *
  14  * You should have received a copy of the GNU Lesser General Public          *
  15  * License along with gfxprim; if not, write to the Free Software            *
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
  17  * Boston, MA  02110-1301  USA                                               *
  18  *                                                                           *
  19  * Copyright (C) 2009-2010 Jiri "BlueBear" Dluhos                            *
  20  *                         <jiri.bluebear.dluhos@gmail.com>                  *
  21  *                                                                           *
  22  * Copyright (C) 2009-2012 Cyril Hrubis <metan@ucw.cz>                       *
  23  *                                                                           *
  24  *****************************************************************************/
  25
  26 #include "GP_Core.h"
  27
  28 #include "../../config.h"
  29
  30 #ifdef HAVE_LIBSDL
  31
  32 #include "GP_SDL.h"
  33
  34 GP_RetCode GP_SDL_ContextFromSurface(GP_Context *context, SDL_Surface *surf)
  35 {
  36         if (surf == NULL || surf->pixels == NULL || context == NULL)
  37                 return GP_ENULLPTR;
  38
  39         /* sanity checks on the SDL surface */
  40         if (surf->format->BytesPerPixel == 0 || surf->format->BytesPerPixel > 4)
  41                 return GP_ENOIMPL;
  42
  43         enum GP_PixelType pixeltype = GP_PixelRGBMatch(surf->format->Rmask,
  44                                                        surf->format->Gmask,
  45                                                        surf->format->Bmask,
  46                                                        surf->format->Ashift,
  47                                                        surf->format->BitsPerPixel);
  48
  49         if (pixeltype == GP_PIXEL_UNKNOWN)
  50                 return GP_ENOIMPL;
  51
  52         /* basic structure and size */
  53         context->pixels = surf->pixels;
  54         context->bpp = 8 * surf->format->BytesPerPixel;
  55         context->pixel_type = pixeltype;
  56         context->bytes_per_row = surf->pitch;
  57         context->w = surf->w;
  58         context->h = surf->h;
  59
  60         /* orientation */
  61         context->axes_swap = 0;
  62         context->x_swap = 0;
  63         context->y_swap = 0;
  64
  65         return GP_ESUCCESS;
  66 }
  67
  68 #endif /* HAVE_LIBSDL */