J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1995-2007 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | /* |
| 27 | * This file was based upon the example.c stub file included in the |
| 28 | * release 6 of the Independent JPEG Group's free JPEG software. |
| 29 | * It has been updated to conform to release 6b. |
| 30 | */ |
| 31 | |
| 32 | /* First, if system header files define "boolean" map it to "system_boolean" */ |
| 33 | #define boolean system_boolean |
| 34 | |
| 35 | #include <stdio.h> |
| 36 | #include <setjmp.h> |
| 37 | #include <string.h> |
| 38 | #include <stdlib.h> |
| 39 | #include <assert.h> |
| 40 | |
| 41 | #include "jni.h" |
| 42 | #include "jni_util.h" |
| 43 | |
| 44 | /* undo "system_boolean" hack and undef FAR since we don't use it anyway */ |
| 45 | #undef boolean |
| 46 | #undef FAR |
| 47 | #include <jpeglib.h> |
| 48 | #include "jerror.h" |
| 49 | |
| 50 | /* The method IDs we cache. Note that the last two belongs to the |
| 51 | * java.io.InputStream class. |
| 52 | */ |
| 53 | static jmethodID sendHeaderInfoID; |
| 54 | static jmethodID sendPixelsByteID; |
| 55 | static jmethodID sendPixelsIntID; |
| 56 | static jmethodID InputStream_readID; |
| 57 | static jmethodID InputStream_availableID; |
| 58 | |
| 59 | /* Initialize the Java VM instance variable when the library is |
| 60 | first loaded */ |
| 61 | JavaVM *jvm; |
| 62 | |
| 63 | JNIEXPORT jint JNICALL |
| 64 | JNI_OnLoad(JavaVM *vm, void *reserved) |
| 65 | { |
| 66 | jvm = vm; |
| 67 | return JNI_VERSION_1_2; |
| 68 | } |
| 69 | |
| 70 | /* |
| 71 | * ERROR HANDLING: |
| 72 | * |
| 73 | * The JPEG library's standard error handler (jerror.c) is divided into |
| 74 | * several "methods" which you can override individually. This lets you |
| 75 | * adjust the behavior without duplicating a lot of code, which you might |
| 76 | * have to update with each future release. |
| 77 | * |
| 78 | * Our example here shows how to override the "error_exit" method so that |
| 79 | * control is returned to the library's caller when a fatal error occurs, |
| 80 | * rather than calling exit() as the standard error_exit method does. |
| 81 | * |
| 82 | * We use C's setjmp/longjmp facility to return control. This means that the |
| 83 | * routine which calls the JPEG library must first execute a setjmp() call to |
| 84 | * establish the return point. We want the replacement error_exit to do a |
| 85 | * longjmp(). But we need to make the setjmp buffer accessible to the |
| 86 | * error_exit routine. To do this, we make a private extension of the |
| 87 | * standard JPEG error handler object. (If we were using C++, we'd say we |
| 88 | * were making a subclass of the regular error handler.) |
| 89 | * |
| 90 | * Here's the extended error handler struct: |
| 91 | */ |
| 92 | |
| 93 | struct sun_jpeg_error_mgr { |
| 94 | struct jpeg_error_mgr pub; /* "public" fields */ |
| 95 | |
| 96 | jmp_buf setjmp_buffer; /* for return to caller */ |
| 97 | }; |
| 98 | |
| 99 | typedef struct sun_jpeg_error_mgr * sun_jpeg_error_ptr; |
| 100 | |
| 101 | /* |
| 102 | * Here's the routine that will replace the standard error_exit method: |
| 103 | */ |
| 104 | |
| 105 | METHODDEF(void) |
| 106 | sun_jpeg_error_exit (j_common_ptr cinfo) |
| 107 | { |
| 108 | /* cinfo->err really points to a sun_jpeg_error_mgr struct */ |
| 109 | sun_jpeg_error_ptr myerr = (sun_jpeg_error_ptr) cinfo->err; |
| 110 | |
| 111 | /* Always display the message. */ |
| 112 | /* We could postpone this until after returning, if we chose. */ |
| 113 | /* (*cinfo->err->output_message) (cinfo); */ |
| 114 | /* For Java, we will format the message and put it in the error we throw. */ |
| 115 | |
| 116 | /* Return control to the setjmp point */ |
| 117 | longjmp(myerr->setjmp_buffer, 1); |
| 118 | } |
| 119 | |
| 120 | /* |
| 121 | * Error Message handling |
| 122 | * |
| 123 | * This overrides the output_message method to send JPEG messages |
| 124 | * |
| 125 | */ |
| 126 | |
| 127 | METHODDEF(void) |
| 128 | sun_jpeg_output_message (j_common_ptr cinfo) |
| 129 | { |
| 130 | char buffer[JMSG_LENGTH_MAX]; |
| 131 | |
| 132 | /* Create the message */ |
| 133 | (*cinfo->err->format_message) (cinfo, buffer); |
| 134 | |
| 135 | /* Send it to stderr, adding a newline */ |
| 136 | fprintf(stderr, "%s\n", buffer); |
| 137 | } |
| 138 | |
| 139 | |
| 140 | |
| 141 | |
| 142 | /* |
| 143 | * INPUT HANDLING: |
| 144 | * |
| 145 | * The JPEG library's input management is defined by the jpeg_source_mgr |
| 146 | * structure which contains two fields to convey the information in the |
| 147 | * buffer and 5 methods which perform all buffer management. The library |
| 148 | * defines a standard input manager that uses stdio for obtaining compressed |
| 149 | * jpeg data, but here we need to use Java to get our data. |
| 150 | * |
| 151 | * We need to make the Java class information accessible to the source_mgr |
| 152 | * input routines. We also need to store a pointer to the start of the |
| 153 | * Java array being used as an input buffer so that it is not moved or |
| 154 | * garbage collected while the JPEG library is using it. To store these |
| 155 | * things, we make a private extension of the standard JPEG jpeg_source_mgr |
| 156 | * object. |
| 157 | * |
| 158 | * Here's the extended source manager struct: |
| 159 | */ |
| 160 | |
| 161 | struct sun_jpeg_source_mgr { |
| 162 | struct jpeg_source_mgr pub; /* "public" fields */ |
| 163 | |
| 164 | jobject hInputStream; |
| 165 | int suspendable; |
| 166 | unsigned long remaining_skip; |
| 167 | |
| 168 | JOCTET *inbuf; |
| 169 | jbyteArray hInputBuffer; |
| 170 | size_t inbufoffset; |
| 171 | |
| 172 | /* More stuff */ |
| 173 | union pixptr { |
| 174 | int *ip; |
| 175 | unsigned char *bp; |
| 176 | } outbuf; |
| 177 | jobject hOutputBuffer; |
| 178 | }; |
| 179 | |
| 180 | typedef struct sun_jpeg_source_mgr * sun_jpeg_source_ptr; |
| 181 | |
| 182 | /* We use Get/ReleasePrimitiveArrayCritical functions to avoid |
| 183 | * the need to copy buffer elements. |
| 184 | * |
| 185 | * MAKE SURE TO: |
| 186 | * |
| 187 | * - carefully insert pairs of RELEASE_ARRAYS and GET_ARRAYS around |
| 188 | * callbacks to Java. |
| 189 | * - call RELEASE_ARRAYS before returning to Java. |
| 190 | * |
| 191 | * Otherwise things will go horribly wrong. There may be memory leaks, |
| 192 | * excessive pinning, or even VM crashes! |
| 193 | * |
| 194 | * Note that GetPrimitiveArrayCritical may fail! |
| 195 | */ |
| 196 | static void RELEASE_ARRAYS(JNIEnv *env, sun_jpeg_source_ptr src) |
| 197 | { |
| 198 | if (src->inbuf) { |
| 199 | if (src->pub.next_input_byte == 0) { |
| 200 | src->inbufoffset = -1; |
| 201 | } else { |
| 202 | src->inbufoffset = src->pub.next_input_byte - src->inbuf; |
| 203 | } |
| 204 | (*env)->ReleasePrimitiveArrayCritical(env, src->hInputBuffer, |
| 205 | src->inbuf, 0); |
| 206 | src->inbuf = 0; |
| 207 | } |
| 208 | if (src->outbuf.ip) { |
| 209 | (*env)->ReleasePrimitiveArrayCritical(env, src->hOutputBuffer, |
| 210 | src->outbuf.ip, 0); |
| 211 | src->outbuf.ip = 0; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | static int GET_ARRAYS(JNIEnv *env, sun_jpeg_source_ptr src) |
| 216 | { |
| 217 | if (src->hInputBuffer) { |
| 218 | assert(src->inbuf == 0); |
| 219 | src->inbuf = (JOCTET *)(*env)->GetPrimitiveArrayCritical |
| 220 | (env, src->hInputBuffer, 0); |
| 221 | if (src->inbuf == 0) { |
| 222 | return 0; |
| 223 | } |
| 224 | if ((int)(src->inbufoffset) >= 0) { |
| 225 | src->pub.next_input_byte = src->inbuf + src->inbufoffset; |
| 226 | } |
| 227 | } |
| 228 | if (src->hOutputBuffer) { |
| 229 | assert(src->outbuf.ip == 0); |
| 230 | src->outbuf.ip = (int *)(*env)->GetPrimitiveArrayCritical |
| 231 | (env, src->hOutputBuffer, 0); |
| 232 | if (src->outbuf.ip == 0) { |
| 233 | RELEASE_ARRAYS(env, src); |
| 234 | return 0; |
| 235 | } |
| 236 | } |
| 237 | return 1; |
| 238 | } |
| 239 | |
| 240 | /* |
| 241 | * Initialize source. This is called by jpeg_read_header() before any |
| 242 | * data is actually read. Unlike init_destination(), it may leave |
| 243 | * bytes_in_buffer set to 0 (in which case a fill_input_buffer() call |
| 244 | * will occur immediately). |
| 245 | */ |
| 246 | |
| 247 | GLOBAL(void) |
| 248 | sun_jpeg_init_source(j_decompress_ptr cinfo) |
| 249 | { |
| 250 | sun_jpeg_source_ptr src = (sun_jpeg_source_ptr) cinfo->src; |
| 251 | src->pub.next_input_byte = 0; |
| 252 | src->pub.bytes_in_buffer = 0; |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * This is called whenever bytes_in_buffer has reached zero and more |
| 257 | * data is wanted. In typical applications, it should read fresh data |
| 258 | * into the buffer (ignoring the current state of next_input_byte and |
| 259 | * bytes_in_buffer), reset the pointer & count to the start of the |
| 260 | * buffer, and return TRUE indicating that the buffer has been reloaded. |
| 261 | * It is not necessary to fill the buffer entirely, only to obtain at |
| 262 | * least one more byte. bytes_in_buffer MUST be set to a positive value |
| 263 | * if TRUE is returned. A FALSE return should only be used when I/O |
| 264 | * suspension is desired (this mode is discussed in the next section). |
| 265 | */ |
| 266 | /* |
| 267 | * Note that with I/O suspension turned on, this procedure should not |
| 268 | * do any work since the JPEG library has a very simple backtracking |
| 269 | * mechanism which relies on the fact that the buffer will be filled |
| 270 | * only when it has backed out to the top application level. When |
| 271 | * suspendable is turned on, the sun_jpeg_fill_suspended_buffer will |
| 272 | * do the actual work of filling the buffer. |
| 273 | */ |
| 274 | |
| 275 | GLOBAL(boolean) |
| 276 | sun_jpeg_fill_input_buffer(j_decompress_ptr cinfo) |
| 277 | { |
| 278 | sun_jpeg_source_ptr src = (sun_jpeg_source_ptr) cinfo->src; |
| 279 | JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2); |
| 280 | int ret, buflen; |
| 281 | |
| 282 | if (src->suspendable) { |
| 283 | return FALSE; |
| 284 | } |
| 285 | if (src->remaining_skip) { |
| 286 | src->pub.skip_input_data(cinfo, 0); |
| 287 | } |
| 288 | RELEASE_ARRAYS(env, src); |
| 289 | buflen = (*env)->GetArrayLength(env, src->hInputBuffer); |
| 290 | ret = (*env)->CallIntMethod(env, src->hInputStream, InputStream_readID, |
| 291 | src->hInputBuffer, 0, buflen); |
| 292 | if ((*env)->ExceptionOccurred(env) || !GET_ARRAYS(env, src)) { |
| 293 | cinfo->err->error_exit((struct jpeg_common_struct *) cinfo); |
| 294 | } |
| 295 | if (ret <= 0) { |
| 296 | /* Silently accept truncated JPEG files */ |
| 297 | WARNMS(cinfo, JWRN_JPEG_EOF); |
| 298 | src->inbuf[0] = (JOCTET) 0xFF; |
| 299 | src->inbuf[1] = (JOCTET) JPEG_EOI; |
| 300 | ret = 2; |
| 301 | } |
| 302 | |
| 303 | src->pub.next_input_byte = src->inbuf; |
| 304 | src->pub.bytes_in_buffer = ret; |
| 305 | |
| 306 | return TRUE; |
| 307 | } |
| 308 | |
| 309 | /* |
| 310 | * Note that with I/O suspension turned on, the JPEG library requires |
| 311 | * that all buffer filling be done at the top application level. Due |
| 312 | * to the way that backtracking works, this procedure should save all |
| 313 | * of the data that was left in the buffer when suspension occured and |
| 314 | * only read new data at the end. |
| 315 | */ |
| 316 | |
| 317 | GLOBAL(void) |
| 318 | sun_jpeg_fill_suspended_buffer(j_decompress_ptr cinfo) |
| 319 | { |
| 320 | sun_jpeg_source_ptr src = (sun_jpeg_source_ptr) cinfo->src; |
| 321 | JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2); |
| 322 | size_t offset, buflen; |
| 323 | int ret; |
| 324 | |
| 325 | RELEASE_ARRAYS(env, src); |
| 326 | ret = (*env)->CallIntMethod(env, src->hInputStream, |
| 327 | InputStream_availableID); |
| 328 | if ((*env)->ExceptionOccurred(env) || !GET_ARRAYS(env, src)) { |
| 329 | cinfo->err->error_exit((struct jpeg_common_struct *) cinfo); |
| 330 | } |
| 331 | if (ret <= src->remaining_skip) { |
| 332 | return; |
| 333 | } |
| 334 | if (src->remaining_skip) { |
| 335 | src->pub.skip_input_data(cinfo, 0); |
| 336 | } |
| 337 | /* Save the data currently in the buffer */ |
| 338 | offset = src->pub.bytes_in_buffer; |
| 339 | if (src->pub.next_input_byte > src->inbuf) { |
| 340 | memcpy(src->inbuf, src->pub.next_input_byte, offset); |
| 341 | } |
| 342 | RELEASE_ARRAYS(env, src); |
| 343 | buflen = (*env)->GetArrayLength(env, src->hInputBuffer) - offset; |
| 344 | if (buflen <= 0) { |
| 345 | if (!GET_ARRAYS(env, src)) { |
| 346 | cinfo->err->error_exit((struct jpeg_common_struct *) cinfo); |
| 347 | } |
| 348 | return; |
| 349 | } |
| 350 | ret = (*env)->CallIntMethod(env, src->hInputStream, InputStream_readID, |
| 351 | src->hInputBuffer, offset, buflen); |
| 352 | if ((*env)->ExceptionOccurred(env) || !GET_ARRAYS(env, src)) { |
| 353 | cinfo->err->error_exit((struct jpeg_common_struct *) cinfo); |
| 354 | } |
| 355 | if (ret <= 0) { |
| 356 | /* Silently accept truncated JPEG files */ |
| 357 | WARNMS(cinfo, JWRN_JPEG_EOF); |
| 358 | src->inbuf[offset] = (JOCTET) 0xFF; |
| 359 | src->inbuf[offset + 1] = (JOCTET) JPEG_EOI; |
| 360 | ret = 2; |
| 361 | } |
| 362 | |
| 363 | src->pub.next_input_byte = src->inbuf; |
| 364 | src->pub.bytes_in_buffer = ret + offset; |
| 365 | |
| 366 | return; |
| 367 | } |
| 368 | |
| 369 | /* |
| 370 | * Skip num_bytes worth of data. The buffer pointer and count should |
| 371 | * be advanced over num_bytes input bytes, refilling the buffer as |
| 372 | * needed. This is used to skip over a potentially large amount of |
| 373 | * uninteresting data (such as an APPn marker). In some applications |
| 374 | * it may be possible to optimize away the reading of the skipped data, |
| 375 | * but it's not clear that being smart is worth much trouble; large |
| 376 | * skips are uncommon. bytes_in_buffer may be zero on return. |
| 377 | * A zero or negative skip count should be treated as a no-op. |
| 378 | */ |
| 379 | /* |
| 380 | * Note that with I/O suspension turned on, this procedure should not |
| 381 | * do any I/O since the JPEG library has a very simple backtracking |
| 382 | * mechanism which relies on the fact that the buffer will be filled |
| 383 | * only when it has backed out to the top application level. |
| 384 | */ |
| 385 | |
| 386 | GLOBAL(void) |
| 387 | sun_jpeg_skip_input_data(j_decompress_ptr cinfo, long num_bytes) |
| 388 | { |
| 389 | sun_jpeg_source_ptr src = (sun_jpeg_source_ptr) cinfo->src; |
| 390 | JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2); |
| 391 | int ret; |
| 392 | int buflen; |
| 393 | |
| 394 | |
| 395 | if (num_bytes < 0) { |
| 396 | return; |
| 397 | } |
| 398 | num_bytes += src->remaining_skip; |
| 399 | src->remaining_skip = 0; |
| 400 | ret = src->pub.bytes_in_buffer; |
| 401 | if (ret >= num_bytes) { |
| 402 | src->pub.next_input_byte += num_bytes; |
| 403 | src->pub.bytes_in_buffer -= num_bytes; |
| 404 | return; |
| 405 | } |
| 406 | num_bytes -= ret; |
| 407 | if (src->suspendable) { |
| 408 | src->remaining_skip = num_bytes; |
| 409 | src->pub.bytes_in_buffer = 0; |
| 410 | src->pub.next_input_byte = src->inbuf; |
| 411 | return; |
| 412 | } |
| 413 | |
| 414 | /* Note that the signature for the method indicates that it takes |
| 415 | * and returns a long. Casting the int num_bytes to a long on |
| 416 | * the input should work well enough, and if we assume that the |
| 417 | * return value for this particular method should always be less |
| 418 | * than the argument value (or -1), then the return value coerced |
| 419 | * to an int should return us the information we need... |
| 420 | */ |
| 421 | RELEASE_ARRAYS(env, src); |
| 422 | buflen = (*env)->GetArrayLength(env, src->hInputBuffer); |
| 423 | while (num_bytes > 0) { |
| 424 | ret = (*env)->CallIntMethod(env, src->hInputStream, |
| 425 | InputStream_readID, |
| 426 | src->hInputBuffer, 0, buflen); |
| 427 | if ((*env)->ExceptionOccurred(env)) { |
| 428 | cinfo->err->error_exit((struct jpeg_common_struct *) cinfo); |
| 429 | } |
| 430 | if (ret < 0) { |
| 431 | break; |
| 432 | } |
| 433 | num_bytes -= ret; |
| 434 | } |
| 435 | if (!GET_ARRAYS(env, src)) { |
| 436 | cinfo->err->error_exit((struct jpeg_common_struct *) cinfo); |
| 437 | } |
| 438 | if (num_bytes > 0) { |
| 439 | /* Silently accept truncated JPEG files */ |
| 440 | WARNMS(cinfo, JWRN_JPEG_EOF); |
| 441 | src->inbuf[0] = (JOCTET) 0xFF; |
| 442 | src->inbuf[1] = (JOCTET) JPEG_EOI; |
| 443 | src->pub.bytes_in_buffer = 2; |
| 444 | src->pub.next_input_byte = src->inbuf; |
| 445 | } else { |
| 446 | src->pub.bytes_in_buffer = -num_bytes; |
| 447 | src->pub.next_input_byte = src->inbuf + ret + num_bytes; |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | /* |
| 452 | * Terminate source --- called by jpeg_finish_decompress() after all |
| 453 | * data has been read. Often a no-op. |
| 454 | */ |
| 455 | |
| 456 | GLOBAL(void) |
| 457 | sun_jpeg_term_source(j_decompress_ptr cinfo) |
| 458 | { |
| 459 | } |
| 460 | |
| 461 | JNIEXPORT void JNICALL |
| 462 | Java_sun_awt_image_JPEGImageDecoder_initIDs(JNIEnv *env, jclass cls, |
| 463 | jclass InputStreamClass) |
| 464 | { |
| 465 | sendHeaderInfoID = (*env)->GetMethodID(env, cls, "sendHeaderInfo", |
| 466 | "(IIZZZ)Z"); |
| 467 | sendPixelsByteID = (*env)->GetMethodID(env, cls, "sendPixels", "([BI)Z"); |
| 468 | sendPixelsIntID = (*env)->GetMethodID(env, cls, "sendPixels", "([II)Z"); |
| 469 | InputStream_readID = (*env)->GetMethodID(env, InputStreamClass, |
| 470 | "read", "([BII)I"); |
| 471 | InputStream_availableID = (*env)->GetMethodID(env, InputStreamClass, |
| 472 | "available", "()I"); |
| 473 | } |
| 474 | |
| 475 | |
| 476 | /* |
| 477 | * The Windows Itanium Aug 2002 SDK generates bad code |
| 478 | * for this routine. Disable optimization for now. |
| 479 | */ |
| 480 | #ifdef _M_IA64 |
| 481 | #pragma optimize ("", off) |
| 482 | #endif |
| 483 | |
| 484 | JNIEXPORT void JNICALL |
| 485 | Java_sun_awt_image_JPEGImageDecoder_readImage(JNIEnv *env, |
| 486 | jobject this, |
| 487 | jobject hInputStream, |
| 488 | jbyteArray hInputBuffer) |
| 489 | { |
| 490 | /* This struct contains the JPEG decompression parameters and pointers to |
| 491 | * working space (which is allocated as needed by the JPEG library). |
| 492 | */ |
| 493 | struct jpeg_decompress_struct cinfo; |
| 494 | /* We use our private extension JPEG error handler. |
| 495 | * Note that this struct must live as long as the main JPEG parameter |
| 496 | * struct, to avoid dangling-pointer problems. |
| 497 | */ |
| 498 | struct sun_jpeg_error_mgr jerr; |
| 499 | struct sun_jpeg_source_mgr jsrc; |
| 500 | |
| 501 | int ret; |
| 502 | unsigned char *bp; |
| 503 | int *ip, pixel; |
| 504 | int grayscale; |
| 505 | int hasalpha; |
| 506 | int buffered_mode; |
| 507 | int final_pass; |
| 508 | |
| 509 | /* Step 0: verify the inputs. */ |
| 510 | |
| 511 | if (hInputBuffer == 0 || hInputStream == 0) { |
| 512 | JNU_ThrowNullPointerException(env, 0); |
| 513 | return; |
| 514 | } |
| 515 | |
| 516 | jsrc.outbuf.ip = 0; |
| 517 | jsrc.inbuf = 0; |
| 518 | |
| 519 | /* Step 1: allocate and initialize JPEG decompression object */ |
| 520 | |
| 521 | /* We set up the normal JPEG error routines, then override error_exit. */ |
| 522 | cinfo.err = jpeg_std_error(&jerr.pub); |
| 523 | jerr.pub.error_exit = sun_jpeg_error_exit; |
| 524 | |
| 525 | /* We need to setup our own print routines */ |
| 526 | jerr.pub.output_message = sun_jpeg_output_message; |
| 527 | |
| 528 | /* Establish the setjmp return context for sun_jpeg_error_exit to use. */ |
| 529 | if (setjmp(jerr.setjmp_buffer)) { |
| 530 | /* If we get here, the JPEG code has signaled an error. |
| 531 | * We need to clean up the JPEG object, close the input file, and return. |
| 532 | */ |
| 533 | jpeg_destroy_decompress(&cinfo); |
| 534 | RELEASE_ARRAYS(env, &jsrc); |
| 535 | if (!(*env)->ExceptionOccurred(env)) { |
| 536 | char buffer[JMSG_LENGTH_MAX]; |
| 537 | (*cinfo.err->format_message) ((struct jpeg_common_struct *) &cinfo, |
| 538 | buffer); |
| 539 | JNU_ThrowByName(env, "sun/awt/image/ImageFormatException", buffer); |
| 540 | } |
| 541 | return; |
| 542 | } |
| 543 | /* Now we can initialize the JPEG decompression object. */ |
| 544 | jpeg_create_decompress(&cinfo); |
| 545 | |
| 546 | /* Step 2: specify data source (eg, a file) */ |
| 547 | |
| 548 | cinfo.src = &jsrc.pub; |
| 549 | jsrc.hInputStream = hInputStream; |
| 550 | jsrc.hInputBuffer = hInputBuffer; |
| 551 | jsrc.hOutputBuffer = 0; |
| 552 | jsrc.suspendable = FALSE; |
| 553 | jsrc.remaining_skip = 0; |
| 554 | jsrc.inbufoffset = -1; |
| 555 | jsrc.pub.init_source = sun_jpeg_init_source; |
| 556 | jsrc.pub.fill_input_buffer = sun_jpeg_fill_input_buffer; |
| 557 | jsrc.pub.skip_input_data = sun_jpeg_skip_input_data; |
| 558 | jsrc.pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */ |
| 559 | jsrc.pub.term_source = sun_jpeg_term_source; |
| 560 | if (!GET_ARRAYS(env, &jsrc)) { |
| 561 | jpeg_destroy_decompress(&cinfo); |
| 562 | return; |
| 563 | } |
| 564 | /* Step 3: read file parameters with jpeg_read_header() */ |
| 565 | |
| 566 | (void) jpeg_read_header(&cinfo, TRUE); |
| 567 | /* select buffered-image mode if it is a progressive JPEG only */ |
| 568 | buffered_mode = cinfo.buffered_image = jpeg_has_multiple_scans(&cinfo); |
| 569 | grayscale = (cinfo.out_color_space == JCS_GRAYSCALE); |
| 570 | #ifdef YCCALPHA |
| 571 | hasalpha = (cinfo.out_color_space == JCS_RGBA); |
| 572 | #else |
| 573 | hasalpha = 0; |
| 574 | #endif |
| 575 | /* We can ignore the return value from jpeg_read_header since |
| 576 | * (a) suspension is not possible with the stdio data source, and |
| 577 | * (nor with the Java input source) |
| 578 | * (b) we passed TRUE to reject a tables-only JPEG file as an error. |
| 579 | * See libjpeg.doc for more info. |
| 580 | */ |
| 581 | RELEASE_ARRAYS(env, &jsrc); |
| 582 | ret = (*env)->CallBooleanMethod(env, this, sendHeaderInfoID, |
| 583 | cinfo.image_width, cinfo.image_height, |
| 584 | grayscale, hasalpha, buffered_mode); |
| 585 | if ((*env)->ExceptionOccurred(env) || !ret) { |
| 586 | /* No more interest in this image... */ |
| 587 | jpeg_destroy_decompress(&cinfo); |
| 588 | return; |
| 589 | } |
| 590 | /* Make a one-row-high sample array with enough room to expand to ints */ |
| 591 | if (grayscale) { |
| 592 | jsrc.hOutputBuffer = (*env)->NewByteArray(env, cinfo.image_width); |
| 593 | } else { |
| 594 | jsrc.hOutputBuffer = (*env)->NewIntArray(env, cinfo.image_width); |
| 595 | } |
| 596 | |
| 597 | if (jsrc.hOutputBuffer == 0 || !GET_ARRAYS(env, &jsrc)) { |
| 598 | jpeg_destroy_decompress(&cinfo); |
| 599 | return; |
| 600 | } |
| 601 | |
| 602 | /* Step 4: set parameters for decompression */ |
| 603 | |
| 604 | /* In this example, we don't need to change any of the defaults set by |
| 605 | * jpeg_read_header(), so we do nothing here. |
| 606 | */ |
| 607 | /* For the first pass for Java, we want to deal with RGB for simplicity */ |
| 608 | /* Unfortunately, the JPEG code does not automatically convert Grayscale */ |
| 609 | /* to RGB, so we have to deal with Grayscale explicitly. */ |
| 610 | if (!grayscale && !hasalpha) { |
| 611 | cinfo.out_color_space = JCS_RGB; |
| 612 | } |
| 613 | |
| 614 | /* Step 5: Start decompressor */ |
| 615 | |
| 616 | jpeg_start_decompress(&cinfo); |
| 617 | |
| 618 | /* We may need to do some setup of our own at this point before reading |
| 619 | * the data. After jpeg_start_decompress() we have the correct scaled |
| 620 | * output image dimensions available, as well as the output colormap |
| 621 | * if we asked for color quantization. |
| 622 | */ |
| 623 | |
| 624 | /* Step 6: while (scan lines remain to be read) */ |
| 625 | /* jpeg_read_scanlines(...); */ |
| 626 | |
| 627 | /* Here we use the library's state variable cinfo.output_scanline as the |
| 628 | * loop counter, so that we don't have to keep track ourselves. |
| 629 | */ |
| 630 | if (buffered_mode) { |
| 631 | final_pass = FALSE; |
| 632 | cinfo.dct_method = JDCT_IFAST; |
| 633 | } else { |
| 634 | final_pass = TRUE; |
| 635 | } |
| 636 | do { |
| 637 | if (buffered_mode) { |
| 638 | do { |
| 639 | sun_jpeg_fill_suspended_buffer(&cinfo); |
| 640 | jsrc.suspendable = TRUE; |
| 641 | ret = jpeg_consume_input(&cinfo); |
| 642 | jsrc.suspendable = FALSE; |
| 643 | } while (ret != JPEG_SUSPENDED && ret != JPEG_REACHED_EOI); |
| 644 | if (ret == JPEG_REACHED_EOI) { |
| 645 | final_pass = TRUE; |
| 646 | cinfo.dct_method = JDCT_ISLOW; |
| 647 | } |
| 648 | jpeg_start_output(&cinfo, cinfo.input_scan_number); |
| 649 | } |
| 650 | while (cinfo.output_scanline < cinfo.output_height) { |
| 651 | if (! final_pass) { |
| 652 | do { |
| 653 | sun_jpeg_fill_suspended_buffer(&cinfo); |
| 654 | jsrc.suspendable = TRUE; |
| 655 | ret = jpeg_consume_input(&cinfo); |
| 656 | jsrc.suspendable = FALSE; |
| 657 | } while (ret != JPEG_SUSPENDED && ret != JPEG_REACHED_EOI); |
| 658 | if (ret == JPEG_REACHED_EOI) { |
| 659 | break; |
| 660 | } |
| 661 | } |
| 662 | (void) jpeg_read_scanlines(&cinfo, (JSAMPARRAY) &(jsrc.outbuf), 1); |
| 663 | |
| 664 | if (grayscale) { |
| 665 | RELEASE_ARRAYS(env, &jsrc); |
| 666 | ret = (*env)->CallBooleanMethod(env, this, sendPixelsByteID, |
| 667 | jsrc.hOutputBuffer, |
| 668 | cinfo.output_scanline - 1); |
| 669 | } else { |
| 670 | if (hasalpha) { |
| 671 | ip = jsrc.outbuf.ip + cinfo.image_width; |
| 672 | bp = jsrc.outbuf.bp + cinfo.image_width * 4; |
| 673 | while (ip > jsrc.outbuf.ip) { |
| 674 | pixel = (*--bp) << 24; |
| 675 | pixel |= (*--bp); |
| 676 | pixel |= (*--bp) << 8; |
| 677 | pixel |= (*--bp) << 16; |
| 678 | *--ip = pixel; |
| 679 | } |
| 680 | } else { |
| 681 | ip = jsrc.outbuf.ip + cinfo.image_width; |
| 682 | bp = jsrc.outbuf.bp + cinfo.image_width * 3; |
| 683 | while (ip > jsrc.outbuf.ip) { |
| 684 | pixel = (*--bp); |
| 685 | pixel |= (*--bp) << 8; |
| 686 | pixel |= (*--bp) << 16; |
| 687 | *--ip = pixel; |
| 688 | } |
| 689 | } |
| 690 | RELEASE_ARRAYS(env, &jsrc); |
| 691 | ret = (*env)->CallBooleanMethod(env, this, sendPixelsIntID, |
| 692 | jsrc.hOutputBuffer, |
| 693 | cinfo.output_scanline - 1); |
| 694 | } |
| 695 | if ((*env)->ExceptionOccurred(env) || !ret || |
| 696 | !GET_ARRAYS(env, &jsrc)) { |
| 697 | /* No more interest in this image... */ |
| 698 | jpeg_destroy_decompress(&cinfo); |
| 699 | return; |
| 700 | } |
| 701 | } |
| 702 | if (buffered_mode) { |
| 703 | jpeg_finish_output(&cinfo); |
| 704 | } |
| 705 | } while (! final_pass); |
| 706 | |
| 707 | /* Step 7: Finish decompression */ |
| 708 | |
| 709 | (void) jpeg_finish_decompress(&cinfo); |
| 710 | /* We can ignore the return value since suspension is not possible |
| 711 | * with the stdio data source. |
| 712 | * (nor with the Java data source) |
| 713 | */ |
| 714 | |
| 715 | /* Step 8: Release JPEG decompression object */ |
| 716 | |
| 717 | /* This is an important step since it will release a good deal of memory. */ |
| 718 | jpeg_destroy_decompress(&cinfo); |
| 719 | |
| 720 | /* After finish_decompress, we can close the input file. |
| 721 | * Here we postpone it until after no more JPEG errors are possible, |
| 722 | * so as to simplify the setjmp error logic above. (Actually, I don't |
| 723 | * think that jpeg_destroy can do an error exit, but why assume anything...) |
| 724 | */ |
| 725 | /* Not needed for Java - the Java code will close the file */ |
| 726 | /* fclose(infile); */ |
| 727 | |
| 728 | /* At this point you may want to check to see whether any corrupt-data |
| 729 | * warnings occurred (test whether jerr.pub.num_warnings is nonzero). |
| 730 | */ |
| 731 | |
| 732 | /* And we're done! */ |
| 733 | |
| 734 | RELEASE_ARRAYS(env, &jsrc); |
| 735 | return; |
| 736 | } |
| 737 | #ifdef _M_IA64 |
| 738 | #pragma optimize ("", on) |
| 739 | #endif |
| 740 | |
| 741 | |
| 742 | /* |
| 743 | * SOME FINE POINTS: |
| 744 | * |
| 745 | * In the above code, we ignored the return value of jpeg_read_scanlines, |
| 746 | * which is the number of scanlines actually read. We could get away with |
| 747 | * this because we asked for only one line at a time and we weren't using |
| 748 | * a suspending data source. See libjpeg.doc for more info. |
| 749 | * |
| 750 | * We cheated a bit by calling alloc_sarray() after jpeg_start_decompress(); |
| 751 | * we should have done it beforehand to ensure that the space would be |
| 752 | * counted against the JPEG max_memory setting. In some systems the above |
| 753 | * code would risk an out-of-memory error. However, in general we don't |
| 754 | * know the output image dimensions before jpeg_start_decompress(), unless we |
| 755 | * call jpeg_calc_output_dimensions(). See libjpeg.doc for more about this. |
| 756 | * |
| 757 | * Scanlines are returned in the same order as they appear in the JPEG file, |
| 758 | * which is standardly top-to-bottom. If you must emit data bottom-to-top, |
| 759 | * you can use one of the virtual arrays provided by the JPEG memory manager |
| 760 | * to invert the data. See wrbmp.c for an example. |
| 761 | * |
| 762 | * As with compression, some operating modes may require temporary files. |
| 763 | * On some systems you may need to set up a signal handler to ensure that |
| 764 | * temporary files are deleted if the program is interrupted. See libjpeg.doc. |
| 765 | */ |