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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 3 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/>.
*
*/
/*
* aautil.h --- helpers for anti-aliasing routines for Allegro
*
* This file is gift-ware. This file is given to you freely
* as a gift. You may use, modify, redistribute, and generally hack
* it about in any way you like, and you do not have to give anyone
* anything in return.
*
* I do not accept any responsibility for any effects, adverse or
* otherwise, that this code may have on just about anything that
* you can think of. Use it at your own risk.
*
* Copyright (C) 1998, 1999 Michael Bukin
*/
#ifndef AGS_LIB_AASTR_AAUTIL_H
#define AGS_LIB_AASTR_AAUTIL_H
#include "ags/lib/allegro.h"
namespace AGS3 {
/*
* Change aa_BITS, and never aa_SIZE or aa_MASK.
* 8 or 4 are probably the fastest for i386+.
* Recompile the package after changing aa_BITS.
*/
#ifdef aa_BITS
#undef aa_BITS
#endif
#define aa_BITS 8
#if ((aa_BITS < 0) || (aa_BITS > 12))
#error aa_BITS must be (0 <= aa_BITS <= 12)
#endif
#define aa_SIZE (1UL << aa_BITS)
#define aa_MASK (aa_SIZE - 1)
#define aa_MAX_SIZE (1UL << 12)
#define aa_MAX_NUM (aa_MAX_SIZE * aa_MAX_SIZE)
/* Prepare Bresenham line parameters. */
#define aa_PREPARE(inc,dd,i1,i2,_yw,_xw) \
{ \
int xw = (_xw); \
int yw = (_yw); \
\
if ((xw == 0) || ((yw < xw) && (yw > -xw))) { \
(inc) = 0; \
} \
else { \
(inc) = yw / xw; \
yw %= xw; \
} \
if (yw < 0) { \
(inc) -= 1; \
yw += xw; \
} \
(i2) = ((dd) = ((i1) = 2 * yw) - xw) - xw; \
}
/* Advance to the next point. */
#define aa_ADVANCE(y,inc,dd,i1,i2) \
{ \
if ((dd) >= 0) \
(y) += (inc) + 1, (dd) += (i2); \
else \
(y) += (inc), (dd) += (i1); \
}
#ifdef __cplusplus
extern "C" {
#endif
/* Prepare offsets for direct access to 24bpp bitmap. */
void _aa_prepare_for_24bpp(void);
/* Add r,g,b values from source bitmap. */
void _aa_add_rgb8(BITMAP *_src, int _sx1, int _sx2, int _sy1, int _sy2, uint32_t _num);
#ifdef ALLEGRO_COLOR16
void _aa_add_rgb15(BITMAP *_src, int _sx1, int _sx2, int _sy1, int _sy2, uint32_t _num);
void _aa_add_rgb16(BITMAP *_src, int _sx1, int _sx2, int _sy1, int _sy2, uint32_t _num);
#endif
#ifdef ALLEGRO_COLOR24
void _aa_add_rgb24(BITMAP *_src, int _sx1, int _sx2, int _sy1, int _sy2, uint32_t _num);
#endif
#ifdef ALLEGRO_COLOR32
void _aa_add_rgb32(BITMAP *_src, int _sx1, int _sx2, int _sy1, int _sy2, uint32_t _num);
#endif
/* Put pixel to destination bitmap. */
void _aa_put_rgb8(byte *addr, int _x);
#ifdef ALLEGRO_COLOR16
void _aa_put_rgb15(byte *addr, int _x);
void _aa_put_rgb16(byte *addr, int _x);
#endif
#ifdef ALLEGRO_COLOR24
void _aa_put_rgb24(byte *addr, int _x);
#endif
#ifdef ALLEGRO_COLOR32
void _aa_put_rgb32(byte *addr, int _x);
#endif
/* Add r,g,b and transparency values from source bitmap. */
void _aa_masked_add_rgb8(BITMAP *_src, int _sx1, int _sx2, int _sy1, int _sy2,
uint32_t _num);
#ifdef ALLEGRO_COLOR16
void _aa_masked_add_rgb15(BITMAP *_src, int _sx1, int _sx2, int _sy1, int _sy2,
uint32_t _num);
void _aa_masked_add_rgb16(BITMAP *_src, int _sx1, int _sx2, int _sy1, int _sy2,
uint32_t _num);
#endif
#ifdef ALLEGRO_COLOR24
void _aa_masked_add_rgb24(BITMAP *_src, int _sx1, int _sx2, int _sy1, int _sy2,
uint32_t _num);
#endif
#ifdef ALLEGRO_COLOR32
void _aa_masked_add_rgb32(BITMAP *_src, int _sx1, int _sx2, int _sy1, int _sy2,
uint32_t _num);
#endif
/* Put masked pixel to destination bitmap. */
void _aa_masked_put_rgb8(byte *addr, int _x);
#ifdef ALLEGRO_COLOR16
void _aa_masked_put_rgb15(byte *addr, int _x);
void _aa_masked_put_rgb16(byte *addr, int _x);
#endif
#ifdef ALLEGRO_COLOR24
void _aa_masked_put_rgb24(byte *addr, int _x);
#endif
#ifdef ALLEGRO_COLOR32
void _aa_masked_put_rgb32(byte *addr, int _x);
#endif
#ifdef __cplusplus
}
#endif
} // namespace AGS3
#endif
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