lib/art/art_uta_rect.c

   1 /* Libart_LGPL - library of basic graphic primitives
   2  * Copyright (C) 1998 Raph Levien
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library 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  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "config.h"
  21 #include "art_uta_rect.h"
  22
  23 #include "art_misc.h"
  24 #include "art_uta.h"
  25 #include "art_rect.h"
  26
  27 /**
  28  * art_uta_from_irect: Generate uta covering a rectangle.
  29  * @bbox: The source rectangle.
  30  *
  31  * Generates a uta exactly covering @bbox. Please do not call this
  32  * function with a @bbox with zero height or width.
  33  *
  34  * Return value: the new uta.
  35  **/
  36 ArtUta *
  37 art_uta_from_irect (ArtIRect *bbox)
  38 {
  39   ArtUta *uta;
  40   ArtUtaBbox *utiles;
  41   ArtUtaBbox bb;
  42   int width, height;
  43   int x, y;
  44   int xf0, yf0, xf1, yf1;
  45   int ix;
  46
  47   uta = art_new (ArtUta, 1);
  48   uta->x0 = bbox->x0 >> ART_UTILE_SHIFT;
  49   uta->y0 = bbox->y0 >> ART_UTILE_SHIFT;
  50   width = ((bbox->x1 + ART_UTILE_SIZE - 1) >> ART_UTILE_SHIFT) - uta->x0;
  51   height = ((bbox->y1 + ART_UTILE_SIZE - 1) >> ART_UTILE_SHIFT) - uta->y0;
  52   utiles = art_new (ArtUtaBbox, width * height);
  53
  54   uta->width = width;
  55   uta->height = height;
  56   uta->utiles = utiles;
  57
  58   xf0 = bbox->x0 & (ART_UTILE_SIZE - 1);
  59   yf0 = bbox->y0 & (ART_UTILE_SIZE - 1);
  60   xf1 = ((bbox->x1 - 1) & (ART_UTILE_SIZE - 1)) + 1;
  61   yf1 = ((bbox->y1 - 1) & (ART_UTILE_SIZE - 1)) + 1;
  62   if (height == 1)
  63     {
  64       if (width == 1)
  65         utiles[0] = ART_UTA_BBOX_CONS (xf0, yf0, xf1, yf1);
  66       else
  67         {
  68           utiles[0] = ART_UTA_BBOX_CONS (xf0, yf0, ART_UTILE_SIZE, yf1);
  69           bb = ART_UTA_BBOX_CONS (0, yf0, ART_UTILE_SIZE, yf1);
  70           for (x = 1; x < width - 1; x++)
  71             utiles[x] = bb;
  72           utiles[x] = ART_UTA_BBOX_CONS (0, yf0, xf1, yf1);
  73         }
  74     }
  75   else
  76     {
  77       if (width == 1)
  78         {
  79           utiles[0] = ART_UTA_BBOX_CONS (xf0, yf0, xf1, ART_UTILE_SIZE);
  80           bb = ART_UTA_BBOX_CONS (xf0, 0, xf1, ART_UTILE_SIZE);
  81           for (y = 1; y < height - 1; y++)
  82             utiles[y] = bb;
  83           utiles[y] = ART_UTA_BBOX_CONS (xf0, 0, xf1, yf1);
  84         }
  85       else
  86         {
  87           utiles[0] =
  88             ART_UTA_BBOX_CONS (xf0, yf0, ART_UTILE_SIZE, ART_UTILE_SIZE);
  89           bb = ART_UTA_BBOX_CONS (0, yf0, ART_UTILE_SIZE, ART_UTILE_SIZE);
  90           for (x = 1; x < width - 1; x++)
  91             utiles[x] = bb;
  92           utiles[x] = ART_UTA_BBOX_CONS (0, yf0, xf1, ART_UTILE_SIZE);
  93           ix = width;
  94           for (y = 1; y < height - 1; y++)
  95             {
  96               utiles[ix++] =
  97                 ART_UTA_BBOX_CONS (xf0, 0, ART_UTILE_SIZE, ART_UTILE_SIZE);
  98               bb = ART_UTA_BBOX_CONS (0, 0, ART_UTILE_SIZE, ART_UTILE_SIZE);
  99               for (x = 1; x < width - 1; x++)
 100                 utiles[ix++] = bb;
 101               utiles[ix++] = ART_UTA_BBOX_CONS (0, 0, xf1, ART_UTILE_SIZE);
 102             }
 103           utiles[ix++] = ART_UTA_BBOX_CONS (xf0, 0, ART_UTILE_SIZE, yf1);
 104           bb = ART_UTA_BBOX_CONS (0, 0, ART_UTILE_SIZE, yf1);
 105           for (x = 1; x < width - 1; x++)
 106             utiles[ix++] = bb;
 107           utiles[ix++] = ART_UTA_BBOX_CONS (0, 0, xf1, yf1);
 108         }
 109     }
 110   return uta;
 111 }