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.
*
*/
// Based off ffmpeg's RPZA decoder
#include "video/codecs/rpza.h"
#include "common/debug.h"
#include "common/system.h"
#include "common/stream.h"
#include "common/textconsole.h"
#include "graphics/colormasks.h"
namespace Video {
RPZADecoder::RPZADecoder(uint16 width, uint16 height) : Codec() {
_pixelFormat = g_system->getScreenFormat();
// We need to increase the surface size to a multiple of 4
uint16 wMod = width % 4;
if(wMod != 0)
width += 4 - wMod;
debug(2, "RPZA corrected width: %d", width);
_surface = new Graphics::Surface();
_surface->create(width, height, _pixelFormat);
}
RPZADecoder::~RPZADecoder() {
_surface->free();
delete _surface;
}
#define ADVANCE_BLOCK() \
pixelPtr += 4; \
if (pixelPtr >= _surface->w) { \
pixelPtr = 0; \
rowPtr += _surface->w * 4; \
} \
totalBlocks--; \
if (totalBlocks < 0) \
error("block counter just went negative (this should not happen)") \
// Convert from RGB555 to the format specified by the screen
#define PUT_PIXEL(color) \
if ((int32)blockPtr < _surface->w * _surface->h) { \
byte r = 0, g = 0, b = 0; \
Graphics::colorToRGB<Graphics::ColorMasks<555> >(color, r, g, b); \
if (_pixelFormat.bytesPerPixel == 2) \
*((uint16 *)_surface->pixels + blockPtr) = _pixelFormat.RGBToColor(r, g, b); \
else \
*((uint32 *)_surface->pixels + blockPtr) = _pixelFormat.RGBToColor(r, g, b); \
} \
blockPtr++
const Graphics::Surface *RPZADecoder::decodeImage(Common::SeekableReadStream *stream) {
uint16 colorA = 0, colorB = 0;
uint16 color4[4];
uint32 rowPtr = 0;
uint32 pixelPtr = 0;
uint32 blockPtr = 0;
uint32 rowInc = _surface->w - 4;
uint16 ta;
uint16 tb;
// First byte is always 0xe1. Warn if it's different
byte firstByte = stream->readByte();
if (firstByte != 0xe1)
warning("First RPZA chunk byte is 0x%02x instead of 0xe1", firstByte);
// Get chunk size, ingnoring first byte
uint32 chunkSize = stream->readUint16BE() << 8;
chunkSize += stream->readByte();
// If length mismatch use size from MOV file and try to decode anyway
if (chunkSize != (uint32)stream->size()) {
warning("MOV chunk size != encoded chunk size; using MOV chunk size");
chunkSize = stream->size();
}
// Number of 4x4 blocks in frame
int32 totalBlocks = ((_surface->w + 3) / 4) * ((_surface->h + 3) / 4);
// Process chunk data
while ((uint32)stream->pos() < chunkSize) {
byte opcode = stream->readByte(); // Get opcode
byte numBlocks = (opcode & 0x1f) + 1; // Extract block counter from opcode
// If opcode MSbit is 0, we need more data to decide what to do
if ((opcode & 0x80) == 0) {
colorA = (opcode << 8) | stream->readByte();
opcode = 0;
if (stream->readByte() & 0x80) {
// Must behave as opcode 110xxxxx, using colorA computed
// above. Use fake opcode 0x20 to enter switch block at
// the right place
opcode = 0x20;
numBlocks = 1;
}
stream->seek(-1, SEEK_CUR);
}
switch (opcode & 0xe0) {
case 0x80: // Skip blocks
while (numBlocks--) {
ADVANCE_BLOCK();
}
break;
case 0xa0: // Fill blocks with one color
colorA = stream->readUint16BE();
while (numBlocks--) {
blockPtr = rowPtr + pixelPtr;
for (byte pixel_y = 0; pixel_y < 4; pixel_y++) {
for (byte pixel_x = 0; pixel_x < 4; pixel_x++) {
PUT_PIXEL(colorA);
}
blockPtr += rowInc;
}
ADVANCE_BLOCK();
}
break;
// Fill blocks with 4 colors
case 0xc0:
colorA = stream->readUint16BE();
case 0x20:
colorB = stream->readUint16BE();
// Sort out the colors
color4[0] = colorB;
color4[1] = 0;
color4[2] = 0;
color4[3] = colorA;
// Red components
ta = (colorA >> 10) & 0x1F;
tb = (colorB >> 10) & 0x1F;
color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
// Green components
ta = (colorA >> 5) & 0x1F;
tb = (colorB >> 5) & 0x1F;
color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
// Blue components
ta = colorA & 0x1F;
tb = colorB & 0x1F;
color4[1] |= ((11 * ta + 21 * tb) >> 5);
color4[2] |= ((21 * ta + 11 * tb) >> 5);
while (numBlocks--) {
blockPtr = rowPtr + pixelPtr;
for (byte pixel_y = 0; pixel_y < 4; pixel_y++) {
byte index = stream->readByte();
for (byte pixel_x = 0; pixel_x < 4; pixel_x++){
byte idx = (index >> (2 * (3 - pixel_x))) & 0x03;
PUT_PIXEL(color4[idx]);
}
blockPtr += rowInc;
}
ADVANCE_BLOCK();
}
break;
// Fill block with 16 colors
case 0x00:
blockPtr = rowPtr + pixelPtr;
for (byte pixel_y = 0; pixel_y < 4; pixel_y++) {
for (byte pixel_x = 0; pixel_x < 4; pixel_x++){
// We already have color of upper left pixel
if (pixel_y != 0 || pixel_x != 0)
colorA = stream->readUint16BE();
PUT_PIXEL(colorA);
}
blockPtr += rowInc;
}
ADVANCE_BLOCK();
break;
// Unknown opcode
default:
error("Unknown opcode %02x in rpza chunk", opcode);
}
}
return _surface;
}
} // End of namespace Video
|
