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
|
/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
This file is part of Quake III Arena source code.
Quake III Arena source code 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.
Quake III Arena source code 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 Quake III Arena source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
#include "tr_local.h"
/*
========================================================================
TGA files are used for 24/32 bit images
========================================================================
*/
typedef struct _TargaHeader {
unsigned char id_length, colormap_type, image_type;
unsigned short colormap_index, colormap_length;
unsigned char colormap_size;
unsigned short x_origin, y_origin, width, height;
unsigned char pixel_size, attributes;
} TargaHeader;
void R_LoadTGA ( const char *name, byte **pic, int *width, int *height)
{
unsigned columns, rows, numPixels;
byte *pixbuf;
int row, column;
byte *buf_p;
byte *end;
union {
byte *b;
void *v;
} buffer;
TargaHeader targa_header;
byte *targa_rgba;
int length;
*pic = NULL;
if(width)
*width = 0;
if(height)
*height = 0;
//
// load the file
//
length = ri.FS_ReadFile ( ( char * ) name, &buffer.v);
if (!buffer.b || length < 0) {
return;
}
if(length < 18)
{
ri.Error( ERR_DROP, "LoadTGA: header too short (%s)\n", name );
}
buf_p = buffer.b;
end = buffer.b + length;
targa_header.id_length = buf_p[0];
targa_header.colormap_type = buf_p[1];
targa_header.image_type = buf_p[2];
memcpy(&targa_header.colormap_index, &buf_p[3], 2);
memcpy(&targa_header.colormap_length, &buf_p[5], 2);
targa_header.colormap_size = buf_p[7];
memcpy(&targa_header.x_origin, &buf_p[8], 2);
memcpy(&targa_header.y_origin, &buf_p[10], 2);
memcpy(&targa_header.width, &buf_p[12], 2);
memcpy(&targa_header.height, &buf_p[14], 2);
targa_header.pixel_size = buf_p[16];
targa_header.attributes = buf_p[17];
targa_header.colormap_index = LittleShort(targa_header.colormap_index);
targa_header.colormap_length = LittleShort(targa_header.colormap_length);
targa_header.x_origin = LittleShort(targa_header.x_origin);
targa_header.y_origin = LittleShort(targa_header.y_origin);
targa_header.width = LittleShort(targa_header.width);
targa_header.height = LittleShort(targa_header.height);
buf_p += 18;
if (targa_header.image_type!=2
&& targa_header.image_type!=10
&& targa_header.image_type != 3 )
{
ri.Error (ERR_DROP, "LoadTGA: Only type 2 (RGB), 3 (gray), and 10 (RGB) TGA images supported\n");
}
if ( targa_header.colormap_type != 0 )
{
ri.Error( ERR_DROP, "LoadTGA: colormaps not supported\n" );
}
if ( ( targa_header.pixel_size != 32 && targa_header.pixel_size != 24 ) && targa_header.image_type != 3 )
{
ri.Error (ERR_DROP, "LoadTGA: Only 32 or 24 bit images supported (no colormaps)\n");
}
columns = targa_header.width;
rows = targa_header.height;
numPixels = columns * rows * 4;
if(!columns || !rows || numPixels > 0x7FFFFFFF || numPixels / columns / 4 != rows)
{
ri.Error (ERR_DROP, "LoadTGA: %s has an invalid image size\n", name);
}
targa_rgba = ri.Malloc (numPixels);
if (targa_header.id_length != 0)
{
if (buf_p + targa_header.id_length > end)
ri.Error( ERR_DROP, "LoadTGA: header too short (%s)\n", name );
buf_p += targa_header.id_length; // skip TARGA image comment
}
if ( targa_header.image_type==2 || targa_header.image_type == 3 )
{
if(buf_p + columns*rows*targa_header.pixel_size/8 > end)
{
ri.Error (ERR_DROP, "LoadTGA: file truncated (%s)\n", name);
}
// Uncompressed RGB or gray scale image
for(row=rows-1; row>=0; row--)
{
pixbuf = targa_rgba + row*columns*4;
for(column=0; column<columns; column++)
{
unsigned char red,green,blue,alphabyte;
switch (targa_header.pixel_size)
{
case 8:
blue = *buf_p++;
green = blue;
red = blue;
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = 255;
break;
case 24:
blue = *buf_p++;
green = *buf_p++;
red = *buf_p++;
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = 255;
break;
case 32:
blue = *buf_p++;
green = *buf_p++;
red = *buf_p++;
alphabyte = *buf_p++;
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alphabyte;
break;
default:
ri.Error( ERR_DROP, "LoadTGA: illegal pixel_size '%d' in file '%s'\n", targa_header.pixel_size, name );
break;
}
}
}
}
else if (targa_header.image_type==10) { // Runlength encoded RGB images
unsigned char red,green,blue,alphabyte,packetHeader,packetSize,j;
red = 0;
green = 0;
blue = 0;
alphabyte = 0xff;
for(row=rows-1; row>=0; row--) {
pixbuf = targa_rgba + row*columns*4;
for(column=0; column<columns; ) {
if(buf_p + 1 > end)
ri.Error (ERR_DROP, "LoadTGA: file truncated (%s)\n", name);
packetHeader= *buf_p++;
packetSize = 1 + (packetHeader & 0x7f);
if (packetHeader & 0x80) { // run-length packet
if(buf_p + targa_header.pixel_size/8 > end)
ri.Error (ERR_DROP, "LoadTGA: file truncated (%s)\n", name);
switch (targa_header.pixel_size) {
case 24:
blue = *buf_p++;
green = *buf_p++;
red = *buf_p++;
alphabyte = 255;
break;
case 32:
blue = *buf_p++;
green = *buf_p++;
red = *buf_p++;
alphabyte = *buf_p++;
break;
default:
ri.Error( ERR_DROP, "LoadTGA: illegal pixel_size '%d' in file '%s'\n", targa_header.pixel_size, name );
break;
}
for(j=0;j<packetSize;j++) {
*pixbuf++=red;
*pixbuf++=green;
*pixbuf++=blue;
*pixbuf++=alphabyte;
column++;
if (column==columns) { // run spans across rows
column=0;
if (row>0)
row--;
else
goto breakOut;
pixbuf = targa_rgba + row*columns*4;
}
}
}
else { // non run-length packet
if(buf_p + targa_header.pixel_size/8*packetSize > end)
ri.Error (ERR_DROP, "LoadTGA: file truncated (%s)\n", name);
for(j=0;j<packetSize;j++) {
switch (targa_header.pixel_size) {
case 24:
blue = *buf_p++;
green = *buf_p++;
red = *buf_p++;
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = 255;
break;
case 32:
blue = *buf_p++;
green = *buf_p++;
red = *buf_p++;
alphabyte = *buf_p++;
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alphabyte;
break;
default:
ri.Error( ERR_DROP, "LoadTGA: illegal pixel_size '%d' in file '%s'\n", targa_header.pixel_size, name );
break;
}
column++;
if (column==columns) { // pixel packet run spans across rows
column=0;
if (row>0)
row--;
else
goto breakOut;
pixbuf = targa_rgba + row*columns*4;
}
}
}
}
breakOut:;
}
}
#if 0
// TTimo: this is the chunk of code to ensure a behavior that meets TGA specs
// bit 5 set => top-down
if (targa_header.attributes & 0x20) {
unsigned char *flip = (unsigned char*)malloc (columns*4);
unsigned char *src, *dst;
for (row = 0; row < rows/2; row++) {
src = targa_rgba + row * 4 * columns;
dst = targa_rgba + (rows - row - 1) * 4 * columns;
memcpy (flip, src, columns*4);
memcpy (src, dst, columns*4);
memcpy (dst, flip, columns*4);
}
free (flip);
}
#endif
// instead we just print a warning
if (targa_header.attributes & 0x20) {
ri.Printf( PRINT_WARNING, "WARNING: '%s' TGA file header declares top-down image, ignoring\n", name);
}
if (width)
*width = columns;
if (height)
*height = rows;
*pic = targa_rgba;
ri.FS_FreeFile (buffer.v);
}
|
