include/filters/GP_ApplyTables.h

   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) 2009-2013 Cyril Hrubis <metan@ucw.cz>                       *
  20  *                                                                           *
  21  *****************************************************************************/
  22
  23 /*
  24
  25   Applies per-channel tables on a context pixels. Used for fast point filters
  26   implementation.
  27
  28  */
  29
  30 #ifndef FILTERS_GP_APPLY_TABLES_H
  31 #define FILTERS_GP_APPLY_TABLES_H
  32
  33 #include "GP_Filter.h"
  34
  35 /*
  36  * Per-channel lookup tables.
  37  */
  38 typedef struct GP_FilterTables {
  39         GP_Pixel *table[GP_PIXELTYPE_MAX_CHANNELS];
  40         int free_table:1;
  41 } GP_FilterTables;
  42
  43 /*
  44  * Generic point filter, applies corresponding table on bitmap.
  45  */
  46 int GP_FilterTablesApply(const GP_Context *const src,
  47                          GP_Coord x_src, GP_Coord y_src,
  48                          GP_Size w_src, GP_Size h_src,
  49                          GP_Context *dst,
  50                          GP_Coord x_dst, GP_Coord y_dst,
  51                          const GP_FilterTables *const tables,
  52                          GP_ProgressCallback *callback);
  53
  54 /*
  55  * Aloocates and initializes tables.
  56  */
  57 int GP_FilterTablesInit(GP_FilterTables *self, const GP_Context *ctx);
  58
  59 /*
  60  * Allocates and initializes table structure and tables.
  61  */
  62 GP_FilterTables *GP_FilterTablesAlloc(const GP_Context *ctx);
  63
  64 /*
  65  * Frees point filter tables.
  66  */
  67 void GP_FilterTablesFree(GP_FilterTables *self);
  68
  69 #endif /* FILTERS_GP_APPLY_TABLES_H */