d2/render/zero.h

   1 // Copyright 2004 David Hilvert <dhilvert@auricle.dyndns.org>,
   2 //                              <dhilvert@ugcs.caltech.edu>
   3
   4 /*  This file is part of the Anti-Lamenessing Engine.
   5
   6     The Anti-Lamenessing Engine is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 3 of the License, or
   9     (at your option) any later version.
  10
  11     The Anti-Lamenessing Engine is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with the Anti-Lamenessing Engine; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 */
  20
  21 /*
  22  * zero.h: A renderer for the zero filter.
  23  */
  24
  25 #ifndef __render_zero_h__
  26 #define __render_zero_h__
  27
  28 #include "incremental.h"
  29 #include "../image_zero.h"
  30
  31 class zero : public incremental {
  32 public:
  33         zero(invariant *inv) : incremental(inv) {
  34                 assert (typeid(*inv->ssfe()->get_scaled_filter()->get_filter()) == typeid(filter::zero));
  35         }
  36
  37         /*
  38          * Perform the current rendering step.
  39          */
  40         virtual void step() {
  41                 assert (get_step() >= -1);
  42                 if (get_step() == 0) {
  43                         transformation t = align::of(0);
  44
  45                         const image *im = image_rw::open(0);
  46
  47                         /*
  48                          * XXX: This approach to trimming pixels is probably a
  49                          * bit too aggressive.  If it is changed, be sure to
  50                          * also change the corresponding lines in
  51                          * incremental.h.
  52                          */
  53
  54                         unsigned int trim_size = (int) ceil(get_scale_factor()) - 1;
  55
  56                         accum_image = new image_zero((int) floor(im->height() * get_scale_factor()) - trim_size,
  57                                                      (int) floor(im->width()  * get_scale_factor()) - trim_size, 3);
  58
  59                         set_extents_by_map(0, t);
  60
  61                         image_rw::close(0);
  62                 } else if (align::match(get_step())) {
  63                         transformation t = align::of(get_step());
  64                         if (is_extend())
  65                                 increase_extents_by_map(get_step(), t);
  66                 }
  67         }
  68
  69         void free_memory() {
  70         }
  71
  72 };
  73
  74 #endif