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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/* 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 "common/stream.h"
#include "common/textconsole.h"
#include "graphics/pixelformat.h"
#include "graphics/surface.h"
#include "graphics/decoders/pcx.h"
/**
* Based on the PCX specs:
* http://www.fileformat.info/format/pcx/spec/a10e75307b3a4cc49c3bbe6db4c41fa2/view.htm
* and the PCX decoder of FFmpeg (libavcodec/pcx.c):
* http://git.videolan.org/?p=ffmpeg.git;a=blob;f=libavcodec/pcx.c
*/
namespace Graphics {
PCXDecoder::PCXDecoder() {
_surface = 0;
_palette = 0;
_paletteColorCount = 0;
}
PCXDecoder::~PCXDecoder() {
destroy();
}
void PCXDecoder::destroy() {
if (_surface) {
_surface->free();
delete _surface;
_surface = 0;
}
delete[] _palette;
_palette = 0;
_paletteColorCount = 0;
}
bool PCXDecoder::loadStream(Common::SeekableReadStream &stream) {
destroy();
if (stream.readByte() != 0x0a) // ZSoft PCX
return false;
byte version = stream.readByte(); // 0 - 5
if (version > 5)
return false;
bool compressed = stream.readByte(); // encoding, 1 = run length encoding
byte bitsPerPixel = stream.readByte(); // 1, 2, 4 or 8
// Window
uint16 xMin = stream.readUint16LE();
uint16 yMin = stream.readUint16LE();
uint16 xMax = stream.readUint16LE();
uint16 yMax = stream.readUint16LE();
uint16 width = xMax - xMin + 1;
uint16 height = yMax - yMin + 1;
if (xMax < xMin || yMax < yMin) {
warning("Invalid PCX image dimensions");
return false;
}
stream.skip(4); // HDpi, VDpi
// Read the EGA palette (colormap)
_palette = new byte[16 * 3];
for (uint16 i = 0; i < 16; i++) {
_palette[i * 3 + 0] = stream.readByte();
_palette[i * 3 + 1] = stream.readByte();
_palette[i * 3 + 2] = stream.readByte();
}
if (stream.readByte() != 0) // reserved, should be set to 0
return false;
byte nPlanes = stream.readByte();
uint16 bytesPerLine = stream.readUint16LE();
uint16 bytesPerscanLine = nPlanes * bytesPerLine;
if (bytesPerscanLine < width * bitsPerPixel * nPlanes / 8) {
warning("PCX data is corrupted");
return false;
}
stream.skip(60); // PaletteInfo, HscreenSize, VscreenSize, Filler
_surface = new Graphics::Surface();
byte *scanLine = new byte[bytesPerscanLine];
byte *dst;
int x, y;
if (nPlanes == 3 && bitsPerPixel == 8) { // 24bpp
Graphics::PixelFormat format = Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0);
_surface->create(width, height, format);
dst = (byte *)_surface->pixels;
_paletteColorCount = 0;
for (y = 0; y < height; y++) {
decodeRLE(stream, scanLine, bytesPerscanLine, compressed);
for (x = 0; x < width; x++) {
byte b = scanLine[x];
byte g = scanLine[x + bytesPerLine];
byte r = scanLine[x + (bytesPerLine << 1)];
uint32 color = format.RGBToColor(r, g, b);
*((uint32 *)dst) = color;
dst += format.bytesPerPixel;
}
}
} else if (nPlanes == 1 && bitsPerPixel == 8) { // 8bpp indexed
_surface->create(width, height, Graphics::PixelFormat::createFormatCLUT8());
dst = (byte *)_surface->pixels;
_paletteColorCount = 16;
for (y = 0; y < height; y++, dst += _surface->pitch) {
decodeRLE(stream, scanLine, bytesPerscanLine, compressed);
memcpy(dst, scanLine, width);
}
if (version == 5) {
if (stream.readByte() != 12) {
warning("Expected a palette after the PCX image data");
delete[] scanLine;
return false;
}
// Read the VGA palette
delete[] _palette;
_palette = new byte[256 * 3];
for (uint16 i = 0; i < 256; i++) {
_palette[i * 3 + 0] = stream.readByte();
_palette[i * 3 + 1] = stream.readByte();
_palette[i * 3 + 2] = stream.readByte();
}
_paletteColorCount = 256;
}
} else if ((nPlanes == 2 || nPlanes == 3 || nPlanes == 4) && bitsPerPixel == 1) { // planar, 4, 8 or 16 colors
_surface->create(width, height, Graphics::PixelFormat::createFormatCLUT8());
dst = (byte *)_surface->pixels;
_paletteColorCount = 16;
for (y = 0; y < height; y++, dst += _surface->pitch) {
decodeRLE(stream, scanLine, bytesPerscanLine, compressed);
for (x = 0; x < width; x++) {
int m = 0x80 >> (x & 7), v = 0;
for (int i = nPlanes - 1; i >= 0; i--) {
v <<= 1;
v += (scanLine[i * bytesPerLine + (x >> 3)] & m) == 0 ? 0 : 1;
}
dst[x] = v;
}
}
} else {
// Known unsupported case: 1 plane and bpp < 8 (1, 2 or 4)
warning("Invalid PCX file (%d planes, %d bpp)", nPlanes, bitsPerPixel);
delete[] scanLine;
return false;
}
delete[] scanLine;
return true;
}
void PCXDecoder::decodeRLE(Common::SeekableReadStream &stream, byte *dst, uint32 bytesPerscanLine, bool compressed) {
uint32 i = 0;
byte run, value;
if (compressed) {
while (i < bytesPerscanLine) {
run = 1;
value = stream.readByte();
if (value >= 0xc0) {
run = value & 0x3f;
value = stream.readByte();
}
while (i < bytesPerscanLine && run--)
dst[i++] = value;
}
} else {
stream.read(dst, bytesPerscanLine);
}
}
} // End of namespace Graphics
|
