libs/gfx/GP_Ellipse.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) 2009-2011 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 "core/GP_GetPutPixel.h"
  27 #include "core/GP_FnPerBpp.h"
  28
  29 #include "gfx/GP_Ellipse.h"
  30 #include "gfx/GP_HLine.h"
  31
  32 #include "algo/Ellipse.algo.h"
  33
  34 /* Generate drawing functions for various bit depths. */
  35 GP_DEF_DRAW_FN_PER_BPP(GP_Ellipse_Raw, DEF_ELLIPSE_FN)
  36
  37 void GP_Ellipse_Raw(GP_Pixmap *pixmap, GP_Coord xcenter, GP_Coord ycenter,
  38                     GP_Size a, GP_Size b, GP_Pixel pixel)
  39 {
  40         GP_CHECK_PIXMAP(pixmap);
  41
  42         GP_FN_PER_BPP_PIXMAP(GP_Ellipse_Raw, pixmap, pixmap,
  43                               xcenter, ycenter, a, b, pixel);
  44 }
  45
  46 void GP_Ellipse(GP_Pixmap *pixmap, GP_Coord xcenter, GP_Coord ycenter,
  47                 GP_Size a, GP_Size b, GP_Pixel pixel)
  48 {
  49         GP_CHECK_PIXMAP(pixmap);
  50
  51         /* recalculate center point and swap a and b when axes are swapped */
  52         GP_TRANSFORM_POINT(pixmap, xcenter, ycenter);
  53         GP_TRANSFORM_SWAP(pixmap, a, b);
  54
  55         GP_Ellipse_Raw(pixmap, xcenter, ycenter, a, b, pixel);
  56 }