author | ohair |
Wed, 06 Apr 2011 22:06:11 -0700 | |
changeset 9035 | 1255eb81cc2f |
parent 8355 | 6b58fe58e767 |
child 12994 | a758ccd05133 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
9035
1255eb81cc2f
7033660: Update copyright year to 2011 on any files changed in 2011
ohair
parents:
8355
diff
changeset
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2 |
* Copyright (c) 1995, 2011, Oracle and/or its affiliates. All rights reserved. |
2 | 3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
|
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* under the terms of the GNU General Public License version 2 only, as |
|
5506 | 7 |
* published by the Free Software Foundation. Oracle designates this |
2 | 8 |
* particular file as subject to the "Classpath" exception as provided |
5506 | 9 |
* by Oracle in the LICENSE file that accompanied this code. |
2 | 10 |
* |
11 |
* This code is distributed in the hope that it will be useful, but WITHOUT |
|
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
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* 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 |
|
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* accompanied this code). |
|
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* |
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* You should have received a copy of the GNU General Public License version |
|
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* 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. |
|
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* |
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5506 | 21 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
22 |
* or visit www.oracle.com if you need additional information or have any |
|
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* questions. |
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2 | 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 |
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96 |
jmp_buf setjmp_buffer; /* for return to caller */ |
|
97 |
}; |
|
98 |
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99 |
typedef struct sun_jpeg_error_mgr * sun_jpeg_error_ptr; |
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100 |
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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 |
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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; |
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177 |
jobject hOutputBuffer; |
|
178 |
}; |
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179 |
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180 |
typedef struct sun_jpeg_source_mgr * sun_jpeg_source_ptr; |
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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 |
} |
|
8355 | 331 |
if (ret < 0 || (unsigned int)ret <= src->remaining_skip) { |
2 | 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; |
|
8355 | 400 |
ret = (int)src->pub.bytes_in_buffer; /* this conversion is safe, because capacity of the buffer is limited by jnit */ |
2 | 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 |
*/ |