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@ r5974:e11b6f5200f9
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Location: cpp/openttd-patchpack/source/src/bmp.cpp
r5974:e11b6f5200f9
9.5 KiB
text/x-c
(svn r8671) -Fix
Fix some strings which were broken in r7581
Fix some strings which were broken in r7581
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 | /* $Id$ */
#include "stdafx.h"
#include "openttd.h"
#include "gfx.h"
#include "bmp.h"
#include "macros.h"
#include "helpers.hpp"
void BmpInitializeBuffer(BmpBuffer *buffer, FILE *file) {
buffer->pos = -1;
buffer->file = file;
buffer->read = 0;
buffer->real_pos = ftell(file);
}
static inline void AdvanceBuffer(BmpBuffer *buffer)
{
buffer->read = (int)fread(buffer->data, 1, BMP_BUFFER_SIZE, buffer->file);
buffer->pos = 0;
}
static inline bool EndOfBuffer(BmpBuffer *buffer)
{
if (buffer->pos == buffer->read || buffer->pos < 0) AdvanceBuffer(buffer);
return buffer->pos == buffer->read;
}
static inline byte ReadByte(BmpBuffer *buffer)
{
if (buffer->pos == buffer->read || buffer->pos < 0) AdvanceBuffer(buffer);
buffer->real_pos++;
return buffer->data[buffer->pos++];
}
static inline uint16 ReadWord(BmpBuffer *buffer)
{
uint16 var = ReadByte(buffer);
return var | (ReadByte(buffer) << 8);
}
static inline uint32 ReadDword(BmpBuffer *buffer)
{
uint32 var = ReadWord(buffer);
return var | (ReadWord(buffer) << 16);
}
static inline void SkipBytes(BmpBuffer *buffer, int bytes)
{
int i;
for (i = 0; i < bytes; i++) ReadByte(buffer);
}
static inline void SetStreamOffset(BmpBuffer *buffer, int offset)
{
fseek(buffer->file, offset, SEEK_SET);
buffer->pos = -1;
buffer->real_pos = offset;
AdvanceBuffer(buffer);
}
/**
* Reads a 1 bpp uncompressed bitmap
* The bitmap is converted to a 8 bpp bitmap
*/
static inline bool BmpRead1(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
{
uint x, y, i;
byte pad = GB(4 - info->width / 8, 0, 2);
byte *pixel_row;
byte b;
for (y = info->height; y > 0; y--) {
x = 0;
pixel_row = &data->bitmap[(y - 1) * info->width];
while (x < info->width) {
if (EndOfBuffer(buffer)) return false; // the file is shorter than expected
b = ReadByte(buffer);
for (i = 8; i > 0; i--) {
if (x < info->width) *pixel_row++ = GB(b, i - 1, 1);
x++;
}
}
/* Padding for 32 bit align */
SkipBytes(buffer, pad);
}
return true;
}
/**
* Reads a 4 bpp uncompressed bitmap
* The bitmap is converted to a 8 bpp bitmap
*/
static inline bool BmpRead4(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
{
uint x, y;
byte pad = GB(4 - info->width / 2, 0, 2);
byte *pixel_row;
byte b;
for (y = info->height; y > 0; y--) {
x = 0;
pixel_row = &data->bitmap[(y - 1) * info->width];
while (x < info->width) {
if (EndOfBuffer(buffer)) return false; // the file is shorter than expected
b = ReadByte(buffer);
*pixel_row++ = GB(b, 4, 4);
x++;
if (x < info->width) {
*pixel_row++ = GB(b, 0, 4);
x++;
}
}
/* Padding for 32 bit align */
SkipBytes(buffer, pad);
}
return true;
}
/**
* Reads a 4-bit RLE compressed bitmap
* The bitmap is converted to a 8 bpp bitmap
*/
static inline bool BmpRead4Rle(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
{
uint i;
uint x = 0;
uint y = info->height - 1;
byte n, c, b;
byte *pixel = &data->bitmap[y * info->width];
while (y != 0 || x < info->width) {
if (EndOfBuffer(buffer)) return false; // the file is shorter than expected
n = ReadByte(buffer);
c = ReadByte(buffer);
if (n == 0) {
switch (c) {
case 0: // end of line
x = 0;
pixel = &data->bitmap[--y * info->width];
break;
case 1: // end of bitmap
x = info->width;
y = 0;
pixel = NULL;
break;
case 2: // delta
x += ReadByte(buffer);
i = ReadByte(buffer);
if (x >= info->width || (y == 0 && i > 0)) return false;
y -= i;
pixel = &data->bitmap[y * info->width + x];
break;
default: // uncompressed
i = 0;
while (i++ < c) {
if (EndOfBuffer(buffer) || x >= info->width) return false;
b = ReadByte(buffer);
*pixel++ = GB(b, 4, 4);
x++;
if (x < info->width && i++ < c) {
*pixel++ = GB(b, 0, 4);
x++;
}
}
/* Padding for 16 bit align */
SkipBytes(buffer, ((c + 1) / 2) % 2);
break;
}
} else {
i = 0;
while (i++ < n) {
if (EndOfBuffer(buffer) || x >= info->width) return false;
*pixel++ = GB(c, 4, 4);
x++;
if (x < info->width && i++ < n) {
*pixel++ = GB(c, 0, 4);
x++;
}
}
}
}
return true;
}
/**
* Reads a 8 bpp bitmap
*/
static inline bool BmpRead8(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
{
uint i;
uint y;
byte pad = GB(4 - info->width, 0, 2);
byte *pixel;
for (y = info->height; y > 0; y--) {
if (EndOfBuffer(buffer)) return false; // the file is shorter than expected
pixel = &data->bitmap[(y - 1) * info->width];
for (i = 0; i < info->width; i++) *pixel++ = ReadByte(buffer);
/* Padding for 32 bit align */
SkipBytes(buffer, pad);
}
return true;
}
/**
* Reads a 8-bit RLE compressed bpp bitmap
*/
static inline bool BmpRead8Rle(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
{
uint i;
uint x = 0;
uint y = info->height - 1;
byte n, c;
byte *pixel = &data->bitmap[y * info->width];
while (y != 0 || x < info->width) {
if (EndOfBuffer(buffer)) return false; // the file is shorter than expected
n = ReadByte(buffer);
c = ReadByte(buffer);
if (n == 0) {
switch (c) {
case 0: // end of line
x = 0;
pixel = &data->bitmap[--y * info->width];
break;
case 1: // end of bitmap
x = info->width;
y = 0;
pixel = NULL;
break;
case 2: // delta
x += ReadByte(buffer);
i = ReadByte(buffer);
if (x >= info->width || (y == 0 && i > 0)) return false;
y -= i;
pixel = &data->bitmap[y * info->width + x];
break;
default: // uncompressed
if ((x += c) > info->width) return false;
for (i = 0; i < c; i++) *pixel++ = ReadByte(buffer);
/* Padding for 16 bit align */
SkipBytes(buffer, c % 2);
break;
}
} else {
for (i = 0; i < n; i++) {
if (x >= info->width) return false;
*pixel++ = c;
x++;
}
}
}
return true;
}
/**
* Reads a 24 bpp uncompressed bitmap
*/
static inline bool BmpRead24(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
{
uint x, y;
byte pad = GB(4 - info->width * 3, 0, 2);
byte *pixel_row;
for (y = info->height; y > 0; y--) {
pixel_row = &data->bitmap[(y - 1) * info->width * 3];
for (x = 0; x < info->width; x++) {
if (EndOfBuffer(buffer)) return false; // the file is shorter than expected
*(pixel_row + 2) = ReadByte(buffer); // green
*(pixel_row + 1) = ReadByte(buffer); // blue
*pixel_row = ReadByte(buffer); // red
pixel_row += 3;
}
/* Padding for 32 bit align */
SkipBytes(buffer, pad);
}
return true;
}
/*
* Reads bitmap headers, and palette (if any)
*/
bool BmpReadHeader(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
{
uint32 header_size;
assert(info != NULL);
/* Reading BMP header */
if (ReadWord(buffer) != 0x4D42) return false; // signature should be 'BM'
SkipBytes(buffer, 8); // skip file size and reserved
info->offset = ReadDword(buffer);
/* Reading info header */
header_size = ReadDword(buffer);
if (header_size < 12) return false; // info header should be at least 12 bytes long
info->os2_bmp = (header_size == 12); // OS/2 1.x or windows 2.x info header is 12 bytes long
if (info->os2_bmp) {
info->width = ReadWord(buffer);
info->height = ReadWord(buffer);
header_size -= 8;
} else {
info->width = ReadDword(buffer);
info->height = ReadDword(buffer);
header_size -= 12;
}
if (ReadWord(buffer) != 1) return false; // BMP can have only 1 plane
info->bpp = ReadWord(buffer);
if (info->bpp != 1 && info->bpp != 4 && info->bpp != 8 && info->bpp != 24) {
/* Only 1 bpp, 4 bpp, 8bpp and 24 bpp bitmaps are supported */
return false;
}
/* Reads compression method if available in info header*/
if ((header_size -= 4) >= 4) {
info->compression = ReadDword(buffer);
header_size -= 4;
}
/* Only 4-bit and 8-bit rle compression is supported */
if (info->compression > 2 || (info->compression > 0 && !(info->bpp == 4 || info->bpp == 8))) return false;
if (info->bpp <= 8) {
uint i;
/* Reads number of colors if available in info header */
if (header_size >= 16) {
SkipBytes(buffer, 12); // skip image size and resolution
info->palette_size = ReadDword(buffer); // number of colors in palette
SkipBytes(buffer, header_size - 16); // skip the end of info header
}
if (info->palette_size == 0) info->palette_size = 1 << info->bpp;
data->palette = CallocT<Colour>(info->palette_size);
if (data->palette == NULL) return false;
for (i = 0; i < info->palette_size; i++) {
data->palette[i].b = ReadByte(buffer);
data->palette[i].g = ReadByte(buffer);
data->palette[i].r = ReadByte(buffer);
if (!info->os2_bmp) SkipBytes(buffer, 1); // unused
}
}
return buffer->real_pos <= info->offset;
}
/*
* Reads the bitmap
* 1 bpp and 4 bpp bitmaps are converted to 8 bpp bitmaps
*/
bool BmpReadBitmap(BmpBuffer *buffer, BmpInfo *info, BmpData *data)
{
assert(info != NULL && data != NULL);
data->bitmap = (byte*)calloc(info->width * info->height, ((info->bpp == 24) ? 3 : 1) * sizeof(byte));
if (data->bitmap == NULL) return false;
/* Load image */
SetStreamOffset(buffer, info->offset);
switch (info->compression) {
case 0: // no compression
switch (info->bpp) {
case 1: return BmpRead1(buffer, info, data);
case 4: return BmpRead4(buffer, info, data);
case 8: return BmpRead8(buffer, info, data);
case 24: return BmpRead24(buffer, info, data);
default: NOT_REACHED(); return false;
}
case 1: return BmpRead8Rle(buffer, info, data); // 8-bit RLE compression
case 2: return BmpRead4Rle(buffer, info, data); // 4-bit RLE compression
default: NOT_REACHED(); return false;
}
}
void BmpDestroyData(BmpData *data)
{
assert(data != NULL);
free(data->palette);
free(data->bitmap);
}
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