aboutsummaryrefslogtreecommitdiff
path: root/engines/lab/image.cpp
blob: 29459b1fcc066f0f03ee43f061623219079278bf (plain)
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
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
/* 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 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

/*
 * This code is based on Labyrinth of Time code with assistance of
 *
 * Copyright (c) 1993 Terra Nova Development
 * Copyright (c) 2004 The Wyrmkeep Entertainment Co.
 *
 */

#include "lab/lab.h"
#include "lab/image.h"

namespace Lab {

/**
 * Reads in an image from disk.
 */
Image::Image(Common::File *s) {
	_width = s->readUint16LE();
	_height = s->readUint16LE();
	s->skip(4);

	uint32 size = _width * _height;
	if (size & 1)
		size++;

	_imageData = new byte[size];	// FIXME: Memory leak!
	s->read(_imageData, size);
}

/**
 * Blits a piece of one image to another.
 */
void Image::blitBitmap(uint16 xs, uint16 ys, Image *imDest,
	uint16 xd, uint16 yd, uint16 width, uint16 height, byte masked) {
	int w = width;
	int h = height;
	int destWidth = (imDest) ? imDest->_width : g_lab->_graphics->_screenWidth;
	int destHeight = (imDest) ? imDest->_height : g_lab->_graphics->_screenHeight;
	byte *destBuffer = (imDest) ? imDest->_imageData : g_lab->_graphics->getCurrentDrawingBuffer();

	if (xd + w > destWidth)
		w = destWidth - xd;

	if (yd + h > destHeight)
		h = destHeight - yd;

	if (w > 0 && h > 0) {
		byte *s = _imageData + ys * _width + xs;
		byte *d = destBuffer + yd * destWidth + xd;

		if (!masked) {
			while (h-- > 0) {
				memcpy(d, s, w);
				s += _width;
				d += destWidth;
			}
		} else {
			while (h-- > 0) {
				byte *ss = s;
				byte *dd = d;
				int ww = w;

				while (ww-- > 0) {
					byte c = *ss++;

					if (c) *dd++ = c - 1;
					else dd++;
				}

				s += _width;
				d += destWidth;
			}
		}
	}
}

/**
 * Draws an image to the screen.
 */
void Image::drawImage(uint16 x, uint16 y) {
	blitBitmap(0, 0, NULL, x, y, _width, _height, false);
}

/**
 * Draws an image to the screen with transparency.
 */
void Image::drawMaskImage(uint16 x, uint16 y) {
	blitBitmap(0, 0, NULL, x, y, _width, _height, true);
}

/**
 * Reads an image from the screen.
 */
void Image::readScreenImage(uint16 x, uint16 y) {
	int w = _width;
	int h = _height;

	if (x + w > g_lab->_graphics->_screenWidth)
		w = g_lab->_graphics->_screenWidth - x;

	if (y + h > g_lab->_graphics->_screenHeight)
		h = g_lab->_graphics->_screenHeight - y;

	if ((w > 0) && (h > 0)) {
		byte *s = _imageData;
		byte *d = g_lab->_graphics->getCurrentDrawingBuffer() + y * g_lab->_graphics->_screenWidth + x;

		while (h-- > 0) {
			memcpy(s, d, w);
			s += _width;
			d += g_lab->_graphics->_screenWidth;
		}
	}
}

} // End of namespace Lab