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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/>.
*
*/
#include "ags/lib/allegro/draw.h"
namespace AGS3 {
void drawing_mode(int mode, BITMAP *pattern, int x_anchor, int y_anchor) {
// TODO: Drawing mode
}
void xor_mode(int on) {
drawing_mode(on ? DRAW_MODE_XOR : DRAW_MODE_SOLID, NULL, 0, 0);
}
void solid_mode(void) {
drawing_mode(DRAW_MODE_SOLID, NULL, 0, 0);
}
void do_line(BITMAP *bmp, int x1, int y1, int x2, int y2, int d, DrawMethod proc) {
int dx = x2 - x1;
int dy = y2 - y1;
int i1, i2;
int x, y;
int dd;
/* worker macro */
#define DO_LINE(pri_sign, pri_c, pri_cond, sec_sign, sec_c, sec_cond) \
{ \
if (d##pri_c == 0) { \
proc(bmp, x1, y1, d); \
return; \
} \
\
i1 = 2 * d##sec_c; \
dd = i1 - (sec_sign (pri_sign d##pri_c)); \
i2 = dd - (sec_sign (pri_sign d##pri_c)); \
\
x = x1; \
y = y1; \
\
while (pri_c pri_cond pri_c##2) { \
proc(bmp, x, y, d); \
\
if (dd sec_cond 0) { \
sec_c = sec_c sec_sign 1; \
dd += i2; \
} \
else \
dd += i1; \
\
pri_c = pri_c pri_sign 1; \
} \
}
if (dx >= 0) {
if (dy >= 0) {
if (dx >= dy) {
/* (x1 <= x2) && (y1 <= y2) && (dx >= dy) */
DO_LINE(+, x, <= , +, y, >=);
} else {
/* (x1 <= x2) && (y1 <= y2) && (dx < dy) */
DO_LINE(+, y, <= , +, x, >=);
}
} else {
if (dx >= -dy) {
/* (x1 <= x2) && (y1 > y2) && (dx >= dy) */
DO_LINE(+, x, <= , -, y, <=);
} else {
/* (x1 <= x2) && (y1 > y2) && (dx < dy) */
DO_LINE(-, y, >= , +, x, >=);
}
}
} else {
if (dy >= 0) {
if (-dx >= dy) {
/* (x1 > x2) && (y1 <= y2) && (dx >= dy) */
DO_LINE(-, x, >= , +, y, >=);
} else {
/* (x1 > x2) && (y1 <= y2) && (dx < dy) */
DO_LINE(+, y, <= , -, x, <=);
}
} else {
if (-dx >= -dy) {
/* (x1 > x2) && (y1 > y2) && (dx >= dy) */
DO_LINE(-, x, >= , -, y, <=);
} else {
/* (x1 > x2) && (y1 > y2) && (dx < dy) */
DO_LINE(-, y, >= , -, x, <=);
}
}
}
#undef DO_LINE
}
} // namespace AGS3
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