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Diffstat (limited to 'libart_lgpl/art_alphagamma.c')
-rw-r--r-- | libart_lgpl/art_alphagamma.c | 85 |
1 files changed, 0 insertions, 85 deletions
diff --git a/libart_lgpl/art_alphagamma.c b/libart_lgpl/art_alphagamma.c deleted file mode 100644 index 4651883cf5..0000000000 --- a/libart_lgpl/art_alphagamma.c +++ /dev/null @@ -1,85 +0,0 @@ -/* Libart_LGPL - library of basic graphic primitives - * Copyright (C) 1998 Raph Levien - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Library General Public License for more details. - * - * You should have received a copy of the GNU Library General Public - * License along with this library; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 02111-1307, USA. - */ - -/* Some functions to build alphagamma tables */ - -#include "config.h" -#include "art_alphagamma.h" - -#include <math.h> - -/** - * art_alphagamma_new: Create a new #ArtAlphaGamma. - * @gamma: Gamma value. - * - * Create a new #ArtAlphaGamma for a specific value of @gamma. When - * correctly implemented (which is generally not the case in libart), - * alpha compositing with an alphagamma parameter is equivalent to - * applying the gamma transformation to source images, doing the alpha - * compositing (in linear intensity space), then applying the inverse - * gamma transformation, bringing it back to a gamma-adjusted - * intensity space. - * - * Return value: The newly created #ArtAlphaGamma. - **/ -ArtAlphaGamma * -art_alphagamma_new (double gamma) -{ - int tablesize; - ArtAlphaGamma *alphagamma; - int i; - int *table; - art_u8 *invtable; - double s, r_gamma; - - tablesize = ceil (gamma * 8); - if (tablesize < 10) - tablesize = 10; - - alphagamma = (ArtAlphaGamma *)art_alloc (sizeof(ArtAlphaGamma) + - ((1 << tablesize) - 1) * - sizeof(art_u8)); - alphagamma->gamma = gamma; - alphagamma->invtable_size = tablesize; - - table = alphagamma->table; - for (i = 0; i < 256; i++) - table[i] = (int)floor (((1 << tablesize) - 1) * - pow (i * (1.0 / 255), gamma) + 0.5); - - invtable = alphagamma->invtable; - s = 1.0 / ((1 << tablesize) - 1); - r_gamma = 1.0 / gamma; - for (i = 0; i < 1 << tablesize; i++) - invtable[i] = (int)floor (255 * pow (i * s, r_gamma) + 0.5); - - return alphagamma; -} - -/** - * art_alphagamma_free: Free an #ArtAlphaGamma. - * @alphagamma: An #ArtAlphaGamma. - * - * Frees the #ArtAlphaGamma. - **/ -void -art_alphagamma_free (ArtAlphaGamma *alphagamma) -{ - art_free (alphagamma); -} |