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
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
|
/* 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/scummsys.h"
#include "common/archive.h"
#include "common/memstream.h"
#include "common/textconsole.h"
#include "xeen/xeen.h"
#include "xeen/screen.h"
#include "xeen/sprites.h"
namespace Xeen {
#define SCENE_CLIP_LEFT 8
#define SCENE_CLIP_RIGHT 223
SpriteResource::SpriteResource() {
_filesize = 0;
_data = nullptr;
_scaledWidth = _scaledHeight = 0;
Common::fill(&_lineDist[0], &_lineDist[SCREEN_WIDTH], false);
}
SpriteResource::SpriteResource(const Common::String &filename) {
_data = nullptr;
_scaledWidth = _scaledHeight = 0;
Common::fill(&_lineDist[0], &_lineDist[SCREEN_WIDTH], false);
load(filename);
}
SpriteResource::~SpriteResource() {
clear();
}
/**
* Copy operator for duplicating a sprite resource
*/
SpriteResource &SpriteResource::operator=(const SpriteResource &src) {
delete[] _data;
_index.clear();
_filesize = src._filesize;
_data = new byte[_filesize];
Common::copy(src._data, src._data + _filesize, _data);
_index.resize(src._index.size());
for (uint i = 0; i < src._index.size(); ++i)
_index[i] = src._index[i];
return *this;
}
/**
* Load a sprite resource from a given file
*/
void SpriteResource::load(const Common::String &filename) {
File f(filename);
load(f);
}
/**
* Load a sprite resource from a given file and archive
*/
void SpriteResource::load(const Common::String &filename, Common::Archive &archive) {
File f(filename, archive);
load(f);
}
/**
* Load a sprite resource from a stream
*/
void SpriteResource::load(Common::SeekableReadStream &f) {
// Read in a copy of the file
_filesize = f.size();
delete[] _data;
_data = new byte[_filesize];
f.read(_data, _filesize);
// Read in the index
f.seek(0);
int count = f.readUint16LE();
_index.resize(count);
for (int i = 0; i < count; ++i) {
_index[i]._offset1 = f.readUint16LE();
_index[i]._offset2 = f.readUint16LE();
}
}
/**
* Clears the sprite resource
*/
void SpriteResource::clear() {
delete[] _data;
_data = nullptr;
_filesize = 0;
}
/**
* Draws a frame using data at a specific offset in the sprite resource
*/
void SpriteResource::drawOffset(XSurface &dest, uint16 offset, const Common::Point &pt,
const Common::Rect &bounds, int flags, int scale) {
static const uint SCALE_TABLE[] = {
0xFFFF, 0xFFEF, 0xEFEF, 0xEFEE, 0xEEEE, 0xEEAE, 0xAEAE, 0xAEAA,
0xAAAA, 0xAA8A, 0x8A8A, 0x8A88, 0x8888, 0x8880, 0x8080, 0x8000
};
static const int PATTERN_STEPS[] = { 0, 1, 1, 1, 2, 2, 3, 3, 0, -1, -1, -1, -2, -2, -3, -3 };
uint16 scaleMask = SCALE_TABLE[scale];
uint16 scaleMaskX = scaleMask, scaleMaskY = scaleMask;
bool flipped = (flags & SPRFLAG_HORIZ_FLIPPED) != 0;
int xInc = flipped ? -1 : 1;
// Get cell header
Common::MemoryReadStream f(_data, _filesize);
f.seek(offset);
int xOffset = f.readUint16LE();
int width = f.readUint16LE();
int yOffset = f.readUint16LE();
int height = f.readUint16LE();
// Figure out drawing x, y
Common::Point destPos;
destPos.x = pt.x + getScaledVal(xOffset, scaleMaskX);
destPos.x += (width - getScaledVal(width, scaleMaskX)) / 2;
destPos.y = pt.y + getScaledVal(yOffset, scaleMaskY);
// If the flags allow the dest surface to be resized, ensure dest surface is big enough
if (flags & SPRFLAG_RESIZE) {
if (dest.w < (xOffset + width) || dest.h < (yOffset + height))
dest.create(xOffset + width, yOffset + height);
}
uint16 scaleMaskXCopy = scaleMaskX;
Common::Rect drawBounds;
drawBounds.left = SCREEN_WIDTH;
drawBounds.top = SCREEN_HEIGHT;
drawBounds.right = drawBounds.bottom = 0;
// Main loop
for (int yCtr = height; yCtr > 0; --yCtr) {
// The number of bytes in this scan line
int lineLength = f.readByte();
if (lineLength == 0) {
// Skip the specified number of scan lines
int numLines = f.readByte();
destPos.y += getScaledVal(numLines, scaleMaskY);
yCtr -= numLines;
continue;
}
// Roll the scale mask
uint bit = (scaleMaskY >> 15) & 1;
scaleMaskY = ((scaleMaskY & 0x7fff) << 1) + bit;
if (!bit) {
// Not a line to be drawn due to scaling down
f.skip(lineLength);
} else if (destPos.y < bounds.top || destPos.y >= bounds.bottom) {
// Skip over the bytes of the line
f.skip(lineLength);
destPos.y++;
} else {
scaleMaskX = scaleMaskXCopy;
int xOffset = f.readByte();
// Initialize the array to hold the temporary data for the line. We do this to make it simpler
// to handle both deciding which pixels to draw in a scaled image, as well as when images
// have been horizontally flipped
int tempLine[SCREEN_WIDTH];
Common::fill(&tempLine[0], &tempLine[SCREEN_WIDTH], -1);
int *lineP = flipped ? &tempLine[width - 1 - xOffset] : &tempLine[xOffset];
// Build up the line
int byteCount, opr1, opr2;
int32 pos;
for (byteCount = 1; byteCount < lineLength; ) {
// The next byte is an opcode that determines what operators are to follow and how to interpret them.
int opcode = f.readByte(); ++byteCount;
// Decode the opcode
int len = opcode & 0x1F;
int cmd = (opcode & 0xE0) >> 5;
switch (cmd) {
case 0: // The following len + 1 bytes are stored as indexes into the color table.
case 1: // The following len + 33 bytes are stored as indexes into the color table.
for (int i = 0; i < opcode + 1; ++i, ++byteCount) {
byte b = f.readByte();
*lineP = b;
lineP += xInc;
}
break;
case 2: // The following byte is an index into the color table, draw it len + 3 times.
opr1 = f.readByte(); ++byteCount;
for (int i = 0; i < len + 3; ++i) {
*lineP = opr1;
lineP += xInc;
}
break;
case 3: // Stream copy command.
opr1 = f.readUint16LE(); byteCount += 2;
pos = f.pos();
f.seek(-opr1, SEEK_CUR);
for (int i = 0; i < len + 4; ++i) {
*lineP = f.readByte();
lineP += xInc;
}
f.seek(pos, SEEK_SET);
break;
case 4: // The following two bytes are indexes into the color table, draw the pair len + 2 times.
opr1 = f.readByte(); ++byteCount;
opr2 = f.readByte(); ++byteCount;
for (int i = 0; i < len + 2; ++i) {
*lineP = opr1;
lineP += xInc;
*lineP = opr2;
lineP += xInc;
}
break;
case 5: // Skip len + 1 pixels
lineP += (len + 1) * xInc;
break;
case 6: // Pattern command.
case 7:
// The pattern command has a different opcode format
len = opcode & 0x07;
cmd = (opcode >> 2) & 0x0E;
opr1 = f.readByte(); ++byteCount;
for (int i = 0; i < len + 3; ++i) {
*lineP = opr1;
lineP += xInc;
opr1 += PATTERN_STEPS[cmd + (i % 2)];
}
break;
default:
break;
}
}
assert(byteCount == lineLength);
drawBounds.top = MIN(drawBounds.top, destPos.y);
drawBounds.bottom = MAX(drawBounds.bottom, destPos.y);
// Handle drawing out the line
byte *destP = (byte *)dest.getBasePtr(destPos.x, destPos.y);
int16 xp = destPos.x;
lineP = &tempLine[0];
for (int xCtr = 0; xCtr < width; ++xCtr, ++lineP) {
bit = (scaleMaskX >> 15) & 1;
scaleMaskX = ((scaleMaskX & 0x7fff) << 1) + bit;
if (bit) {
if (*lineP != -1 && xp >= bounds.left && xp < bounds.right &&
(!(flags & SPRFLAG_SCENE_CLIPPED) || (xp >= SCENE_CLIP_LEFT && xp < SCENE_CLIP_RIGHT))) {
*destP = (byte)*lineP;
drawBounds.left = MIN(drawBounds.left, xp);
drawBounds.right = MAX(drawBounds.right, xp);
}
++destP;
++xp;
}
}
++destPos.y;
}
}
if (drawBounds.isValidRect()) {
drawBounds.clip(Common::Rect(0, 0, dest.w, dest.h));
if (!drawBounds.isEmpty())
dest.addDirtyRect(drawBounds);
}
}
void SpriteResource::draw(XSurface &dest, int frame, const Common::Point &destPos,
int flags, int scale) {
draw(dest, frame, destPos, Common::Rect(0, 0, dest.w, dest.h), flags, scale);
}
void SpriteResource::draw(Window &dest, int frame, const Common::Point &destPos,
int flags, int scale) {
draw(dest, frame, destPos, dest.getBounds(), flags, scale);
}
void SpriteResource::draw(XSurface &dest, int frame, const Common::Point &destPos,
const Common::Rect &bounds, int flags, int scale) {
// TODO: TO test when I find sprites using scale values and flags
assert(scale != 0x8000);
assert(scale >= 0);
drawOffset(dest, _index[frame]._offset1, destPos, bounds, flags, scale);
if (_index[frame]._offset2)
drawOffset(dest, _index[frame]._offset2, destPos, bounds, flags, scale);
}
void SpriteResource::draw(XSurface &dest, int frame) {
draw(dest, frame, Common::Point());
}
uint SpriteResource::getScaledVal(int xy, uint16 &scaleMask) {
if (!xy)
return 0;
uint result = 0;
for (int idx = 0; idx < xy; ++idx) {
uint bit = (scaleMask >> 15) & 1;
scaleMask = ((scaleMask & 0x7fff) << 1) + bit;
result += bit;
}
return result;
}
} // End of namespace Xeen
|