libs/gfx/GP_VLine.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_Common.h"
  27 #include "core/GP_GetPutPixel.h"
  28 #include "core/GP_FnPerBpp.h"
  29
  30 #include "gfx/GP_VLine.h"
  31 #include "gfx/GP_HLine.h"
  32
  33 /*
  34  * Ensures that coordinates are in correct order, and clips them.
  35  * Exits immediately if the line is completely clipped out.
  36  */
  37 #define ORDER_AND_CLIP_COORDS do {             \
  38         if (y0 > y1)                           \
  39                 GP_SWAP(y0, y1);               \
  40         if (x < 0 || x >= (int) context->w ||  \
  41             y1 < 0 || y0 >= (int) context->h)  \
  42                 return;                        \
  43         y0 = GP_MAX(y0, 0);                    \
  44         y1 = GP_MIN(y1, (int) context->h - 1); \
  45 } while (0)
  46
  47 void GP_VLineXYY_Raw(GP_Context *context, GP_Coord x, GP_Coord y0,
  48                      GP_Coord y1, GP_Pixel pixel)
  49 {
  50         GP_CHECK_CONTEXT(context);
  51
  52         ORDER_AND_CLIP_COORDS;
  53
  54         GP_FN_PER_BPP_CONTEXT(GP_VLine_Raw, context, context, x, y0, y1, pixel);
  55 }
  56
  57 void GP_VLineXYH_Raw(GP_Context *context, GP_Coord x, GP_Coord y, GP_Size h,
  58                      GP_Pixel pixel)
  59 {
  60         if (h == 0)
  61                 return;
  62
  63         GP_VLineXYY(context, x, y, y + h - 1, pixel);
  64 }
  65
  66 void GP_VLineXYY(GP_Context *context, GP_Coord x, GP_Coord y0,
  67                   GP_Coord y1, GP_Pixel pixel)
  68 {
  69         GP_CHECK_CONTEXT(context);
  70
  71         if (context->axes_swap) {
  72                 GP_TRANSFORM_Y(context, x);
  73                 GP_TRANSFORM_X(context, y0);
  74                 GP_TRANSFORM_X(context, y1);
  75                 GP_HLine_Raw(context, y0, y1, x, pixel);
  76         } else {
  77                 GP_TRANSFORM_X(context, x);
  78                 GP_TRANSFORM_Y(context, y0);
  79                 GP_TRANSFORM_Y(context, y1);
  80                 GP_VLine_Raw(context, x, y0, y1, pixel);
  81         }
  82 }
  83
  84 void GP_VLineXYH(GP_Context *context, GP_Coord x, GP_Coord y, GP_Size h,
  85                  GP_Pixel pixel)
  86 {
  87         if (h == 0)
  88                 return;
  89
  90         GP_VLineXYY(context, x, y, y + h - 1, pixel);
  91 }