116 lines
3.8 KiB
C++
116 lines
3.8 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "ags/lib/allegro/draw.h"
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namespace AGS3 {
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void drawing_mode(int mode, BITMAP *pattern, int x_anchor, int y_anchor) {
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// TODO: Drawing mode
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}
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void xor_mode(int on) {
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drawing_mode(on ? DRAW_MODE_XOR : DRAW_MODE_SOLID, NULL, 0, 0);
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}
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void solid_mode(void) {
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drawing_mode(DRAW_MODE_SOLID, NULL, 0, 0);
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}
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void do_line(BITMAP *bmp, int x1, int y1, int x2, int y2, int d, DrawMethod proc) {
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int dx = x2 - x1;
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int dy = y2 - y1;
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int i1, i2;
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int x, y;
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int dd;
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/* worker macro */
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#define DO_LINE(pri_sign, pri_c, pri_cond, sec_sign, sec_c, sec_cond) \
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{ \
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if (d##pri_c == 0) { \
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proc(bmp, x1, y1, d); \
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return; \
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} \
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\
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i1 = 2 * d##sec_c; \
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dd = i1 - (sec_sign (pri_sign d##pri_c)); \
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i2 = dd - (sec_sign (pri_sign d##pri_c)); \
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\
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x = x1; \
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y = y1; \
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\
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while (pri_c pri_cond pri_c##2) { \
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proc(bmp, x, y, d); \
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\
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if (dd sec_cond 0) { \
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sec_c = sec_c sec_sign 1; \
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dd += i2; \
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} \
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else \
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dd += i1; \
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\
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pri_c = pri_c pri_sign 1; \
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} \
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}
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if (dx >= 0) {
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if (dy >= 0) {
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if (dx >= dy) {
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/* (x1 <= x2) && (y1 <= y2) && (dx >= dy) */
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DO_LINE(+, x, <= , +, y, >=);
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} else {
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/* (x1 <= x2) && (y1 <= y2) && (dx < dy) */
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DO_LINE(+, y, <= , +, x, >=);
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}
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} else {
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if (dx >= -dy) {
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/* (x1 <= x2) && (y1 > y2) && (dx >= dy) */
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DO_LINE(+, x, <= , -, y, <=);
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} else {
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/* (x1 <= x2) && (y1 > y2) && (dx < dy) */
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DO_LINE(-, y, >= , +, x, >=);
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}
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}
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} else {
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if (dy >= 0) {
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if (-dx >= dy) {
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/* (x1 > x2) && (y1 <= y2) && (dx >= dy) */
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DO_LINE(-, x, >= , +, y, >=);
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} else {
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/* (x1 > x2) && (y1 <= y2) && (dx < dy) */
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DO_LINE(+, y, <= , -, x, <=);
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}
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} else {
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if (-dx >= -dy) {
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/* (x1 > x2) && (y1 > y2) && (dx >= dy) */
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DO_LINE(-, x, >= , -, y, <=);
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} else {
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/* (x1 > x2) && (y1 > y2) && (dx < dy) */
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DO_LINE(-, y, >= , -, x, <=);
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}
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}
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}
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#undef DO_LINE
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}
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} // namespace AGS3
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