/usr/include/gthumb-3.4/gthumb/gimp-op.h is in gthumb-dev 3:3.4.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* GThumb
*
* Copyright (C) 2013 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GIMP_OP_H
#define GIMP_OP_H
#include <config.h>
#include <glib.h>
#include "cairo-utils.h"
/* Optimizations taken from xcftools 1.0.7 written by Henning Makholm
*
* xL : Layer color
* xI : Image color
* aL : Layer alpha
* */
#define ADD_ALPHA(v, a) (add_alpha_table[v][a])
#define ABS_TEMP2(x) (temp2 = (x), (temp2 < 0) ? -temp2: temp2)
#define GIMP_OP_NORMAL(xL, xI, aL) CLAMP_PIXEL (ADD_ALPHA (xL, aL) + ADD_ALPHA (xI, 255 - aL))
#define GIMP_OP_LIGHTEN_ONLY(xL, xI) MAX (xI, xL)
#define GIMP_OP_SCREEN(xL, xI) CLAMP_PIXEL (255 ^ ADD_ALPHA (255 - xI, 255 - xL))
#define GIMP_OP_DODGE(xL, xI) GIMP_OP_DIVIDE (255-xL, xI)
#define GIMP_OP_ADDITION(xL, xI) CLAMP_PIXEL (xI + xL)
#define GIMP_OP_DARKEN_ONLY(xL, xI) MIN (xI, xL)
#define GIMP_OP_MULTIPLY(xL, xI) CLAMP_PIXEL (ADD_ALPHA (xL, xI))
#define GIMP_OP_BURN(xL, xI) CLAMP_PIXEL (255 - GIMP_OP_DIVIDE (xL, 255 - xI))
#define GIMP_OP_SOFT_LIGHT(xL, xI) CLAMP_PIXEL (ADD_ALPHA (xI, xI) + 2 * ADD_ALPHA (xL, ADD_ALPHA (xI, 255 - xI)))
#define GIMP_OP_HARD_LIGHT(xL, xI) CLAMP_PIXEL (xL > 128 ? 255 ^ ADD_ALPHA (255 - xI, 2 * (255 - xL)) : ADD_ALPHA (xI, 2 * xL))
#define GIMP_OP_DIFFERENCE(xL, xI) CLAMP_PIXEL (ABS_TEMP2 (xI - xL))
#define GIMP_OP_SUBTRACT(xL, xI) CLAMP_PIXEL (xI - xL)
#define GIMP_OP_GRAIN_EXTRACT(xL, xI) CLAMP_PIXEL ((int) xI - xL + 128)
#define GIMP_OP_GRAIN_MERGE(xL, xI) CLAMP_PIXEL ((int) xI + xL - 128)
#define GIMP_OP_DIVIDE(xL, xI) CLAMP_PIXEL ((int) (xI) * 256 / (1 + (xL)))
extern guchar add_alpha_table[256][256];
void gimp_op_init (void);
#endif /* GIMP_OP_H */
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