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
|
/* 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.
*
*/
#include "image/bmp.h"
#include "common/stream.h"
#include "common/substream.h"
#include "common/textconsole.h"
#include "graphics/pixelformat.h"
#include "graphics/surface.h"
#include "image/codecs/codec.h"
namespace Image {
BitmapDecoder::BitmapDecoder() {
_surface = 0;
_palette = 0;
_paletteColorCount = 0;
_codec = 0;
}
BitmapDecoder::~BitmapDecoder() {
destroy();
}
void BitmapDecoder::destroy() {
_surface = 0;
delete[] _palette;
_palette = 0;
_paletteColorCount = 0;
delete _codec;
_codec = 0;
}
bool BitmapDecoder::loadStream(Common::SeekableReadStream &stream) {
destroy();
if (stream.readByte() != 'B')
return false;
if (stream.readByte() != 'M')
return false;
/* uint32 fileSize = */ stream.readUint32LE();
/* uint16 res1 = */ stream.readUint16LE();
/* uint16 res2 = */ stream.readUint16LE();
uint32 imageOffset = stream.readUint32LE();
uint32 infoSize = stream.readUint32LE();
if (infoSize != 40) {
warning("Only Windows v3 bitmaps are supported");
return false;
}
uint32 width = stream.readUint32LE();
int32 height = stream.readSint32LE();
if (width == 0 || height == 0)
return false;
if (height < 0) {
warning("Right-side up bitmaps not supported");
return false;
}
/* uint16 planes = */ stream.readUint16LE();
uint16 bitsPerPixel = stream.readUint16LE();
if (bitsPerPixel != 8 && bitsPerPixel != 24 && bitsPerPixel != 32) {
warning("%dbpp bitmaps not supported", bitsPerPixel);
return false;
}
uint32 compression = stream.readUint32BE();
uint32 imageSize = stream.readUint32LE();
/* uint32 pixelsPerMeterX = */ stream.readUint32LE();
/* uint32 pixelsPerMeterY = */ stream.readUint32LE();
_paletteColorCount = stream.readUint32LE();
/* uint32 colorsImportant = */ stream.readUint32LE();
if (bitsPerPixel == 8) {
if (_paletteColorCount == 0)
_paletteColorCount = 256;
// Read the palette
_palette = new byte[_paletteColorCount * 3];
for (uint16 i = 0; i < _paletteColorCount; i++) {
_palette[i * 3 + 2] = stream.readByte();
_palette[i * 3 + 1] = stream.readByte();
_palette[i * 3 + 0] = stream.readByte();
stream.readByte();
}
}
// Create the codec (it will warn about unhandled compression)
_codec = createBitmapCodec(compression, width, height, bitsPerPixel);
if (!_codec)
return false;
// If the image size is zero, set it to the rest of the stream.
if (imageSize == 0)
imageSize = stream.size() - imageOffset;
// Grab the frame data
Common::SeekableSubReadStream subStream(&stream, imageOffset, imageOffset + imageSize);
// We only support raw bitmaps for now
_surface = _codec->decodeFrame(subStream);
return true;
}
} // End of namespace Image
|
