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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/* 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.
*
* $URL$
* $Id$
*/
#include "graphics/thumbnail.h"
#include "graphics/scaler.h"
#include "common/endian.h"
#include "common/system.h"
namespace Graphics {
namespace {
#define THMB_VERSION 1
struct ThumbnailHeader {
uint32 type;
uint32 size;
byte version;
uint16 width, height;
byte bpp;
};
#define ThumbnailHeaderSize (4+4+1+2+2+1)
inline void colorToRGB(uint16 color, uint8 &r, uint8 &g, uint8 &b) {
r = (((color >> 11) & 0x1F) << 3);
g = (((color >> 5) & 0x3F) << 2);
b = ((color&0x1F) << 3);
}
bool loadHeader(Common::SeekableReadStream &in, ThumbnailHeader &header, bool outputWarnings) {
header.type = in.readUint32BE();
// We also accept the bad 'BMHT' header here, for the sake of compatibility
// with some older savegames which were written incorrectly due to a bug in
// ScummVM which wrote the thumb header type incorrectly on LE systems.
if (header.type != MKID_BE('THMB') && header.type != MKID_BE('BMHT')) {
if (outputWarnings)
warning("couldn't find thumbnail header type");
return false;
}
header.size = in.readUint32BE();
header.version = in.readByte();
if (header.version > THMB_VERSION) {
if (outputWarnings)
warning("trying to load a newer thumbnail version: %d instead of %d", header.version, THMB_VERSION);
return false;
}
header.width = in.readUint16BE();
header.height = in.readUint16BE();
header.bpp = in.readByte();
return true;
}
} // end of anonymous namespace
bool checkThumbnailHeader(Common::SeekableReadStream &in) {
uint32 position = in.pos();
ThumbnailHeader header;
bool hasHeader = loadHeader(in, header, false);
in.seek(position, SEEK_SET);
return hasHeader;
}
bool skipThumbnailHeader(Common::SeekableReadStream &in) {
uint32 position = in.pos();
ThumbnailHeader header;
if (!loadHeader(in, header, false)) {
in.seek(position, SEEK_SET);
return false;
}
in.seek(header.size - (in.pos() - position), SEEK_CUR);
return true;
}
bool loadThumbnail(Common::SeekableReadStream &in, Graphics::Surface &to) {
ThumbnailHeader header;
if (!loadHeader(in, header, true))
return false;
if (header.bpp != 2) {
warning("trying to load thumbnail with unsupported bit depth %d", header.bpp);
return false;
}
to.create(header.width, header.height, sizeof(OverlayColor));
OverlayColor *pixels = (OverlayColor *)to.pixels;
for (int y = 0; y < to.h; ++y) {
for (int x = 0; x < to.w; ++x) {
uint8 r, g, b;
colorToRGB(in.readUint16BE(), r, g, b);
// converting to current OSystem Color
*pixels++ = g_system->RGBToColor(r, g, b);
}
}
return true;
}
bool saveThumbnail(Common::WriteStream &out) {
Graphics::Surface thumb;
if (!createThumbnailFromScreen(&thumb)) {
warning("Couldn't create thumbnail from screen, aborting thumbnail save");
return false;
}
bool success = saveThumbnail(out, thumb);
thumb.free();
return success;
}
bool saveThumbnail(Common::WriteStream &out, const Graphics::Surface &thumb) {
if (thumb.bytesPerPixel != 2) {
warning("trying to save thumbnail with bpp different than 2");
return false;
}
ThumbnailHeader header;
header.type = MKID_BE('THMB');
header.size = ThumbnailHeaderSize + thumb.w*thumb.h*thumb.bytesPerPixel;
header.version = THMB_VERSION;
header.width = thumb.w;
header.height = thumb.h;
header.bpp = thumb.bytesPerPixel;
out.writeUint32BE(header.type);
out.writeUint32BE(header.size);
out.writeByte(header.version);
out.writeUint16BE(header.width);
out.writeUint16BE(header.height);
out.writeByte(header.bpp);
// TODO: for later this shouldn't be casted to uint16...
uint16 *pixels = (uint16 *)thumb.pixels;
for (uint16 p = 0; p < thumb.w*thumb.h; ++p, ++pixels)
out.writeUint16BE(*pixels);
return true;
}
} // end of namespace Graphics
|
