| /* |
| * Copyright (c) 1995, 2007, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * This file was based upon the example.c stub file included in the |
| * release 6 of the Independent JPEG Group's free JPEG software. |
| * It has been updated to conform to release 6b. |
| */ |
| |
| /* First, if system header files define "boolean" map it to "system_boolean" */ |
| #define boolean system_boolean |
| |
| #include <stdio.h> |
| #include <setjmp.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <assert.h> |
| |
| #include "jni.h" |
| #include "jni_util.h" |
| |
| /* undo "system_boolean" hack and undef FAR since we don't use it anyway */ |
| #undef boolean |
| #undef FAR |
| #include <jpeglib.h> |
| #include "jerror.h" |
| |
| /* The method IDs we cache. Note that the last two belongs to the |
| * java.io.InputStream class. |
| */ |
| static jmethodID sendHeaderInfoID; |
| static jmethodID sendPixelsByteID; |
| static jmethodID sendPixelsIntID; |
| static jmethodID InputStream_readID; |
| static jmethodID InputStream_availableID; |
| |
| /* Initialize the Java VM instance variable when the library is |
| first loaded */ |
| JavaVM *jvm; |
| |
| JNIEXPORT jint JNICALL |
| JNI_OnLoad(JavaVM *vm, void *reserved) |
| { |
| jvm = vm; |
| return JNI_VERSION_1_2; |
| } |
| |
| /* |
| * ERROR HANDLING: |
| * |
| * The JPEG library's standard error handler (jerror.c) is divided into |
| * several "methods" which you can override individually. This lets you |
| * adjust the behavior without duplicating a lot of code, which you might |
| * have to update with each future release. |
| * |
| * Our example here shows how to override the "error_exit" method so that |
| * control is returned to the library's caller when a fatal error occurs, |
| * rather than calling exit() as the standard error_exit method does. |
| * |
| * We use C's setjmp/longjmp facility to return control. This means that the |
| * routine which calls the JPEG library must first execute a setjmp() call to |
| * establish the return point. We want the replacement error_exit to do a |
| * longjmp(). But we need to make the setjmp buffer accessible to the |
| * error_exit routine. To do this, we make a private extension of the |
| * standard JPEG error handler object. (If we were using C++, we'd say we |
| * were making a subclass of the regular error handler.) |
| * |
| * Here's the extended error handler struct: |
| */ |
| |
| struct sun_jpeg_error_mgr { |
| struct jpeg_error_mgr pub; /* "public" fields */ |
| |
| jmp_buf setjmp_buffer; /* for return to caller */ |
| }; |
| |
| typedef struct sun_jpeg_error_mgr * sun_jpeg_error_ptr; |
| |
| /* |
| * Here's the routine that will replace the standard error_exit method: |
| */ |
| |
| METHODDEF(void) |
| sun_jpeg_error_exit (j_common_ptr cinfo) |
| { |
| /* cinfo->err really points to a sun_jpeg_error_mgr struct */ |
| sun_jpeg_error_ptr myerr = (sun_jpeg_error_ptr) cinfo->err; |
| |
| /* Always display the message. */ |
| /* We could postpone this until after returning, if we chose. */ |
| /* (*cinfo->err->output_message) (cinfo); */ |
| /* For Java, we will format the message and put it in the error we throw. */ |
| |
| /* Return control to the setjmp point */ |
| longjmp(myerr->setjmp_buffer, 1); |
| } |
| |
| /* |
| * Error Message handling |
| * |
| * This overrides the output_message method to send JPEG messages |
| * |
| */ |
| |
| METHODDEF(void) |
| sun_jpeg_output_message (j_common_ptr cinfo) |
| { |
| char buffer[JMSG_LENGTH_MAX]; |
| |
| /* Create the message */ |
| (*cinfo->err->format_message) (cinfo, buffer); |
| |
| /* Send it to stderr, adding a newline */ |
| fprintf(stderr, "%s\n", buffer); |
| } |
| |
| |
| |
| |
| /* |
| * INPUT HANDLING: |
| * |
| * The JPEG library's input management is defined by the jpeg_source_mgr |
| * structure which contains two fields to convey the information in the |
| * buffer and 5 methods which perform all buffer management. The library |
| * defines a standard input manager that uses stdio for obtaining compressed |
| * jpeg data, but here we need to use Java to get our data. |
| * |
| * We need to make the Java class information accessible to the source_mgr |
| * input routines. We also need to store a pointer to the start of the |
| * Java array being used as an input buffer so that it is not moved or |
| * garbage collected while the JPEG library is using it. To store these |
| * things, we make a private extension of the standard JPEG jpeg_source_mgr |
| * object. |
| * |
| * Here's the extended source manager struct: |
| */ |
| |
| struct sun_jpeg_source_mgr { |
| struct jpeg_source_mgr pub; /* "public" fields */ |
| |
| jobject hInputStream; |
| int suspendable; |
| unsigned long remaining_skip; |
| |
| JOCTET *inbuf; |
| jbyteArray hInputBuffer; |
| size_t inbufoffset; |
| |
| /* More stuff */ |
| union pixptr { |
| int *ip; |
| unsigned char *bp; |
| } outbuf; |
| jobject hOutputBuffer; |
| }; |
| |
| typedef struct sun_jpeg_source_mgr * sun_jpeg_source_ptr; |
| |
| /* We use Get/ReleasePrimitiveArrayCritical functions to avoid |
| * the need to copy buffer elements. |
| * |
| * MAKE SURE TO: |
| * |
| * - carefully insert pairs of RELEASE_ARRAYS and GET_ARRAYS around |
| * callbacks to Java. |
| * - call RELEASE_ARRAYS before returning to Java. |
| * |
| * Otherwise things will go horribly wrong. There may be memory leaks, |
| * excessive pinning, or even VM crashes! |
| * |
| * Note that GetPrimitiveArrayCritical may fail! |
| */ |
| static void RELEASE_ARRAYS(JNIEnv *env, sun_jpeg_source_ptr src) |
| { |
| if (src->inbuf) { |
| if (src->pub.next_input_byte == 0) { |
| src->inbufoffset = -1; |
| } else { |
| src->inbufoffset = src->pub.next_input_byte - src->inbuf; |
| } |
| (*env)->ReleasePrimitiveArrayCritical(env, src->hInputBuffer, |
| src->inbuf, 0); |
| src->inbuf = 0; |
| } |
| if (src->outbuf.ip) { |
| (*env)->ReleasePrimitiveArrayCritical(env, src->hOutputBuffer, |
| src->outbuf.ip, 0); |
| src->outbuf.ip = 0; |
| } |
| } |
| |
| static int GET_ARRAYS(JNIEnv *env, sun_jpeg_source_ptr src) |
| { |
| if (src->hInputBuffer) { |
| assert(src->inbuf == 0); |
| src->inbuf = (JOCTET *)(*env)->GetPrimitiveArrayCritical |
| (env, src->hInputBuffer, 0); |
| if (src->inbuf == 0) { |
| return 0; |
| } |
| if ((int)(src->inbufoffset) >= 0) { |
| src->pub.next_input_byte = src->inbuf + src->inbufoffset; |
| } |
| } |
| if (src->hOutputBuffer) { |
| assert(src->outbuf.ip == 0); |
| src->outbuf.ip = (int *)(*env)->GetPrimitiveArrayCritical |
| (env, src->hOutputBuffer, 0); |
| if (src->outbuf.ip == 0) { |
| RELEASE_ARRAYS(env, src); |
| return 0; |
| } |
| } |
| return 1; |
| } |
| |
| /* |
| * Initialize source. This is called by jpeg_read_header() before any |
| * data is actually read. Unlike init_destination(), it may leave |
| * bytes_in_buffer set to 0 (in which case a fill_input_buffer() call |
| * will occur immediately). |
| */ |
| |
| GLOBAL(void) |
| sun_jpeg_init_source(j_decompress_ptr cinfo) |
| { |
| sun_jpeg_source_ptr src = (sun_jpeg_source_ptr) cinfo->src; |
| src->pub.next_input_byte = 0; |
| src->pub.bytes_in_buffer = 0; |
| } |
| |
| /* |
| * This is called whenever bytes_in_buffer has reached zero and more |
| * data is wanted. In typical applications, it should read fresh data |
| * into the buffer (ignoring the current state of next_input_byte and |
| * bytes_in_buffer), reset the pointer & count to the start of the |
| * buffer, and return TRUE indicating that the buffer has been reloaded. |
| * It is not necessary to fill the buffer entirely, only to obtain at |
| * least one more byte. bytes_in_buffer MUST be set to a positive value |
| * if TRUE is returned. A FALSE return should only be used when I/O |
| * suspension is desired (this mode is discussed in the next section). |
| */ |
| /* |
| * Note that with I/O suspension turned on, this procedure should not |
| * do any work since the JPEG library has a very simple backtracking |
| * mechanism which relies on the fact that the buffer will be filled |
| * only when it has backed out to the top application level. When |
| * suspendable is turned on, the sun_jpeg_fill_suspended_buffer will |
| * do the actual work of filling the buffer. |
| */ |
| |
| GLOBAL(boolean) |
| sun_jpeg_fill_input_buffer(j_decompress_ptr cinfo) |
| { |
| sun_jpeg_source_ptr src = (sun_jpeg_source_ptr) cinfo->src; |
| JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2); |
| int ret, buflen; |
| |
| if (src->suspendable) { |
| return FALSE; |
| } |
| if (src->remaining_skip) { |
| src->pub.skip_input_data(cinfo, 0); |
| } |
| RELEASE_ARRAYS(env, src); |
| buflen = (*env)->GetArrayLength(env, src->hInputBuffer); |
| ret = (*env)->CallIntMethod(env, src->hInputStream, InputStream_readID, |
| src->hInputBuffer, 0, buflen); |
| if ((*env)->ExceptionOccurred(env) || !GET_ARRAYS(env, src)) { |
| cinfo->err->error_exit((struct jpeg_common_struct *) cinfo); |
| } |
| if (ret <= 0) { |
| /* Silently accept truncated JPEG files */ |
| WARNMS(cinfo, JWRN_JPEG_EOF); |
| src->inbuf[0] = (JOCTET) 0xFF; |
| src->inbuf[1] = (JOCTET) JPEG_EOI; |
| ret = 2; |
| } |
| |
| src->pub.next_input_byte = src->inbuf; |
| src->pub.bytes_in_buffer = ret; |
| |
| return TRUE; |
| } |
| |
| /* |
| * Note that with I/O suspension turned on, the JPEG library requires |
| * that all buffer filling be done at the top application level. Due |
| * to the way that backtracking works, this procedure should save all |
| * of the data that was left in the buffer when suspension occured and |
| * only read new data at the end. |
| */ |
| |
| GLOBAL(void) |
| sun_jpeg_fill_suspended_buffer(j_decompress_ptr cinfo) |
| { |
| sun_jpeg_source_ptr src = (sun_jpeg_source_ptr) cinfo->src; |
| JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2); |
| size_t offset, buflen; |
| int ret; |
| |
| RELEASE_ARRAYS(env, src); |
| ret = (*env)->CallIntMethod(env, src->hInputStream, |
| InputStream_availableID); |
| if ((*env)->ExceptionOccurred(env) || !GET_ARRAYS(env, src)) { |
| cinfo->err->error_exit((struct jpeg_common_struct *) cinfo); |
| } |
| if (ret <= src->remaining_skip) { |
| return; |
| } |
| if (src->remaining_skip) { |
| src->pub.skip_input_data(cinfo, 0); |
| } |
| /* Save the data currently in the buffer */ |
| offset = src->pub.bytes_in_buffer; |
| if (src->pub.next_input_byte > src->inbuf) { |
| memcpy(src->inbuf, src->pub.next_input_byte, offset); |
| } |
| RELEASE_ARRAYS(env, src); |
| buflen = (*env)->GetArrayLength(env, src->hInputBuffer) - offset; |
| if (buflen <= 0) { |
| if (!GET_ARRAYS(env, src)) { |
| cinfo->err->error_exit((struct jpeg_common_struct *) cinfo); |
| } |
| return; |
| } |
| ret = (*env)->CallIntMethod(env, src->hInputStream, InputStream_readID, |
| src->hInputBuffer, offset, buflen); |
| if ((*env)->ExceptionOccurred(env) || !GET_ARRAYS(env, src)) { |
| cinfo->err->error_exit((struct jpeg_common_struct *) cinfo); |
| } |
| if (ret <= 0) { |
| /* Silently accept truncated JPEG files */ |
| WARNMS(cinfo, JWRN_JPEG_EOF); |
| src->inbuf[offset] = (JOCTET) 0xFF; |
| src->inbuf[offset + 1] = (JOCTET) JPEG_EOI; |
| ret = 2; |
| } |
| |
| src->pub.next_input_byte = src->inbuf; |
| src->pub.bytes_in_buffer = ret + offset; |
| |
| return; |
| } |
| |
| /* |
| * Skip num_bytes worth of data. The buffer pointer and count should |
| * be advanced over num_bytes input bytes, refilling the buffer as |
| * needed. This is used to skip over a potentially large amount of |
| * uninteresting data (such as an APPn marker). In some applications |
| * it may be possible to optimize away the reading of the skipped data, |
| * but it's not clear that being smart is worth much trouble; large |
| * skips are uncommon. bytes_in_buffer may be zero on return. |
| * A zero or negative skip count should be treated as a no-op. |
| */ |
| /* |
| * Note that with I/O suspension turned on, this procedure should not |
| * do any I/O since the JPEG library has a very simple backtracking |
| * mechanism which relies on the fact that the buffer will be filled |
| * only when it has backed out to the top application level. |
| */ |
| |
| GLOBAL(void) |
| sun_jpeg_skip_input_data(j_decompress_ptr cinfo, long num_bytes) |
| { |
| sun_jpeg_source_ptr src = (sun_jpeg_source_ptr) cinfo->src; |
| JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2); |
| int ret; |
| int buflen; |
| |
| |
| if (num_bytes < 0) { |
| return; |
| } |
| num_bytes += src->remaining_skip; |
| src->remaining_skip = 0; |
| ret = src->pub.bytes_in_buffer; |
| if (ret >= num_bytes) { |
| src->pub.next_input_byte += num_bytes; |
| src->pub.bytes_in_buffer -= num_bytes; |
| return; |
| } |
| num_bytes -= ret; |
| if (src->suspendable) { |
| src->remaining_skip = num_bytes; |
| src->pub.bytes_in_buffer = 0; |
| src->pub.next_input_byte = src->inbuf; |
| return; |
| } |
| |
| /* Note that the signature for the method indicates that it takes |
| * and returns a long. Casting the int num_bytes to a long on |
| * the input should work well enough, and if we assume that the |
| * return value for this particular method should always be less |
| * than the argument value (or -1), then the return value coerced |
| * to an int should return us the information we need... |
| */ |
| RELEASE_ARRAYS(env, src); |
| buflen = (*env)->GetArrayLength(env, src->hInputBuffer); |
| while (num_bytes > 0) { |
| ret = (*env)->CallIntMethod(env, src->hInputStream, |
| InputStream_readID, |
| src->hInputBuffer, 0, buflen); |
| if ((*env)->ExceptionOccurred(env)) { |
| cinfo->err->error_exit((struct jpeg_common_struct *) cinfo); |
| } |
| if (ret < 0) { |
| break; |
| } |
| num_bytes -= ret; |
| } |
| if (!GET_ARRAYS(env, src)) { |
| cinfo->err->error_exit((struct jpeg_common_struct *) cinfo); |
| } |
| if (num_bytes > 0) { |
| /* Silently accept truncated JPEG files */ |
| WARNMS(cinfo, JWRN_JPEG_EOF); |
| src->inbuf[0] = (JOCTET) 0xFF; |
| src->inbuf[1] = (JOCTET) JPEG_EOI; |
| src->pub.bytes_in_buffer = 2; |
| src->pub.next_input_byte = src->inbuf; |
| } else { |
| src->pub.bytes_in_buffer = -num_bytes; |
| src->pub.next_input_byte = src->inbuf + ret + num_bytes; |
| } |
| } |
| |
| /* |
| * Terminate source --- called by jpeg_finish_decompress() after all |
| * data has been read. Often a no-op. |
| */ |
| |
| GLOBAL(void) |
| sun_jpeg_term_source(j_decompress_ptr cinfo) |
| { |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_sun_awt_image_JPEGImageDecoder_initIDs(JNIEnv *env, jclass cls, |
| jclass InputStreamClass) |
| { |
| sendHeaderInfoID = (*env)->GetMethodID(env, cls, "sendHeaderInfo", |
| "(IIZZZ)Z"); |
| sendPixelsByteID = (*env)->GetMethodID(env, cls, "sendPixels", "([BI)Z"); |
| sendPixelsIntID = (*env)->GetMethodID(env, cls, "sendPixels", "([II)Z"); |
| InputStream_readID = (*env)->GetMethodID(env, InputStreamClass, |
| "read", "([BII)I"); |
| InputStream_availableID = (*env)->GetMethodID(env, InputStreamClass, |
| "available", "()I"); |
| } |
| |
| |
| /* |
| * The Windows Itanium Aug 2002 SDK generates bad code |
| * for this routine. Disable optimization for now. |
| */ |
| #ifdef _M_IA64 |
| #pragma optimize ("", off) |
| #endif |
| |
| JNIEXPORT void JNICALL |
| Java_sun_awt_image_JPEGImageDecoder_readImage(JNIEnv *env, |
| jobject this, |
| jobject hInputStream, |
| jbyteArray hInputBuffer) |
| { |
| /* This struct contains the JPEG decompression parameters and pointers to |
| * working space (which is allocated as needed by the JPEG library). |
| */ |
| struct jpeg_decompress_struct cinfo; |
| /* We use our private extension JPEG error handler. |
| * Note that this struct must live as long as the main JPEG parameter |
| * struct, to avoid dangling-pointer problems. |
| */ |
| struct sun_jpeg_error_mgr jerr; |
| struct sun_jpeg_source_mgr jsrc; |
| |
| int ret; |
| unsigned char *bp; |
| int *ip, pixel; |
| int grayscale; |
| int hasalpha; |
| int buffered_mode; |
| int final_pass; |
| |
| /* Step 0: verify the inputs. */ |
| |
| if (hInputBuffer == 0 || hInputStream == 0) { |
| JNU_ThrowNullPointerException(env, 0); |
| return; |
| } |
| |
| jsrc.outbuf.ip = 0; |
| jsrc.inbuf = 0; |
| |
| /* Step 1: allocate and initialize JPEG decompression object */ |
| |
| /* We set up the normal JPEG error routines, then override error_exit. */ |
| cinfo.err = jpeg_std_error(&jerr.pub); |
| jerr.pub.error_exit = sun_jpeg_error_exit; |
| |
| /* We need to setup our own print routines */ |
| jerr.pub.output_message = sun_jpeg_output_message; |
| |
| /* Establish the setjmp return context for sun_jpeg_error_exit to use. */ |
| if (setjmp(jerr.setjmp_buffer)) { |
| /* If we get here, the JPEG code has signaled an error. |
| * We need to clean up the JPEG object, close the input file, and return. |
| */ |
| jpeg_destroy_decompress(&cinfo); |
| RELEASE_ARRAYS(env, &jsrc); |
| if (!(*env)->ExceptionOccurred(env)) { |
| char buffer[JMSG_LENGTH_MAX]; |
| (*cinfo.err->format_message) ((struct jpeg_common_struct *) &cinfo, |
| buffer); |
| JNU_ThrowByName(env, "sun/awt/image/ImageFormatException", buffer); |
| } |
| return; |
| } |
| /* Now we can initialize the JPEG decompression object. */ |
| jpeg_create_decompress(&cinfo); |
| |
| /* Step 2: specify data source (eg, a file) */ |
| |
| cinfo.src = &jsrc.pub; |
| jsrc.hInputStream = hInputStream; |
| jsrc.hInputBuffer = hInputBuffer; |
| jsrc.hOutputBuffer = 0; |
| jsrc.suspendable = FALSE; |
| jsrc.remaining_skip = 0; |
| jsrc.inbufoffset = -1; |
| jsrc.pub.init_source = sun_jpeg_init_source; |
| jsrc.pub.fill_input_buffer = sun_jpeg_fill_input_buffer; |
| jsrc.pub.skip_input_data = sun_jpeg_skip_input_data; |
| jsrc.pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */ |
| jsrc.pub.term_source = sun_jpeg_term_source; |
| if (!GET_ARRAYS(env, &jsrc)) { |
| jpeg_destroy_decompress(&cinfo); |
| return; |
| } |
| /* Step 3: read file parameters with jpeg_read_header() */ |
| |
| (void) jpeg_read_header(&cinfo, TRUE); |
| /* select buffered-image mode if it is a progressive JPEG only */ |
| buffered_mode = cinfo.buffered_image = jpeg_has_multiple_scans(&cinfo); |
| grayscale = (cinfo.out_color_space == JCS_GRAYSCALE); |
| #ifdef YCCALPHA |
| hasalpha = (cinfo.out_color_space == JCS_RGBA); |
| #else |
| hasalpha = 0; |
| #endif |
| /* We can ignore the return value from jpeg_read_header since |
| * (a) suspension is not possible with the stdio data source, and |
| * (nor with the Java input source) |
| * (b) we passed TRUE to reject a tables-only JPEG file as an error. |
| * See libjpeg.doc for more info. |
| */ |
| RELEASE_ARRAYS(env, &jsrc); |
| ret = (*env)->CallBooleanMethod(env, this, sendHeaderInfoID, |
| cinfo.image_width, cinfo.image_height, |
| grayscale, hasalpha, buffered_mode); |
| if ((*env)->ExceptionOccurred(env) || !ret) { |
| /* No more interest in this image... */ |
| jpeg_destroy_decompress(&cinfo); |
| return; |
| } |
| /* Make a one-row-high sample array with enough room to expand to ints */ |
| if (grayscale) { |
| jsrc.hOutputBuffer = (*env)->NewByteArray(env, cinfo.image_width); |
| } else { |
| jsrc.hOutputBuffer = (*env)->NewIntArray(env, cinfo.image_width); |
| } |
| |
| if (jsrc.hOutputBuffer == 0 || !GET_ARRAYS(env, &jsrc)) { |
| jpeg_destroy_decompress(&cinfo); |
| return; |
| } |
| |
| /* Step 4: set parameters for decompression */ |
| |
| /* In this example, we don't need to change any of the defaults set by |
| * jpeg_read_header(), so we do nothing here. |
| */ |
| /* For the first pass for Java, we want to deal with RGB for simplicity */ |
| /* Unfortunately, the JPEG code does not automatically convert Grayscale */ |
| /* to RGB, so we have to deal with Grayscale explicitly. */ |
| if (!grayscale && !hasalpha) { |
| cinfo.out_color_space = JCS_RGB; |
| } |
| |
| /* Step 5: Start decompressor */ |
| |
| jpeg_start_decompress(&cinfo); |
| |
| /* We may need to do some setup of our own at this point before reading |
| * the data. After jpeg_start_decompress() we have the correct scaled |
| * output image dimensions available, as well as the output colormap |
| * if we asked for color quantization. |
| */ |
| |
| /* Step 6: while (scan lines remain to be read) */ |
| /* jpeg_read_scanlines(...); */ |
| |
| /* Here we use the library's state variable cinfo.output_scanline as the |
| * loop counter, so that we don't have to keep track ourselves. |
| */ |
| if (buffered_mode) { |
| final_pass = FALSE; |
| cinfo.dct_method = JDCT_IFAST; |
| } else { |
| final_pass = TRUE; |
| } |
| do { |
| if (buffered_mode) { |
| do { |
| sun_jpeg_fill_suspended_buffer(&cinfo); |
| jsrc.suspendable = TRUE; |
| ret = jpeg_consume_input(&cinfo); |
| jsrc.suspendable = FALSE; |
| } while (ret != JPEG_SUSPENDED && ret != JPEG_REACHED_EOI); |
| if (ret == JPEG_REACHED_EOI) { |
| final_pass = TRUE; |
| cinfo.dct_method = JDCT_ISLOW; |
| } |
| jpeg_start_output(&cinfo, cinfo.input_scan_number); |
| } |
| while (cinfo.output_scanline < cinfo.output_height) { |
| if (! final_pass) { |
| do { |
| sun_jpeg_fill_suspended_buffer(&cinfo); |
| jsrc.suspendable = TRUE; |
| ret = jpeg_consume_input(&cinfo); |
| jsrc.suspendable = FALSE; |
| } while (ret != JPEG_SUSPENDED && ret != JPEG_REACHED_EOI); |
| if (ret == JPEG_REACHED_EOI) { |
| break; |
| } |
| } |
| (void) jpeg_read_scanlines(&cinfo, (JSAMPARRAY) &(jsrc.outbuf), 1); |
| |
| if (grayscale) { |
| RELEASE_ARRAYS(env, &jsrc); |
| ret = (*env)->CallBooleanMethod(env, this, sendPixelsByteID, |
| jsrc.hOutputBuffer, |
| cinfo.output_scanline - 1); |
| } else { |
| if (hasalpha) { |
| ip = jsrc.outbuf.ip + cinfo.image_width; |
| bp = jsrc.outbuf.bp + cinfo.image_width * 4; |
| while (ip > jsrc.outbuf.ip) { |
| pixel = (*--bp) << 24; |
| pixel |= (*--bp); |
| pixel |= (*--bp) << 8; |
| pixel |= (*--bp) << 16; |
| *--ip = pixel; |
| } |
| } else { |
| ip = jsrc.outbuf.ip + cinfo.image_width; |
| bp = jsrc.outbuf.bp + cinfo.image_width * 3; |
| while (ip > jsrc.outbuf.ip) { |
| pixel = (*--bp); |
| pixel |= (*--bp) << 8; |
| pixel |= (*--bp) << 16; |
| *--ip = pixel; |
| } |
| } |
| RELEASE_ARRAYS(env, &jsrc); |
| ret = (*env)->CallBooleanMethod(env, this, sendPixelsIntID, |
| jsrc.hOutputBuffer, |
| cinfo.output_scanline - 1); |
| } |
| if ((*env)->ExceptionOccurred(env) || !ret || |
| !GET_ARRAYS(env, &jsrc)) { |
| /* No more interest in this image... */ |
| jpeg_destroy_decompress(&cinfo); |
| return; |
| } |
| } |
| if (buffered_mode) { |
| jpeg_finish_output(&cinfo); |
| } |
| } while (! final_pass); |
| |
| /* Step 7: Finish decompression */ |
| |
| (void) jpeg_finish_decompress(&cinfo); |
| /* We can ignore the return value since suspension is not possible |
| * with the stdio data source. |
| * (nor with the Java data source) |
| */ |
| |
| /* Step 8: Release JPEG decompression object */ |
| |
| /* This is an important step since it will release a good deal of memory. */ |
| jpeg_destroy_decompress(&cinfo); |
| |
| /* After finish_decompress, we can close the input file. |
| * Here we postpone it until after no more JPEG errors are possible, |
| * so as to simplify the setjmp error logic above. (Actually, I don't |
| * think that jpeg_destroy can do an error exit, but why assume anything...) |
| */ |
| /* Not needed for Java - the Java code will close the file */ |
| /* fclose(infile); */ |
| |
| /* At this point you may want to check to see whether any corrupt-data |
| * warnings occurred (test whether jerr.pub.num_warnings is nonzero). |
| */ |
| |
| /* And we're done! */ |
| |
| RELEASE_ARRAYS(env, &jsrc); |
| return; |
| } |
| #ifdef _M_IA64 |
| #pragma optimize ("", on) |
| #endif |
| |
| |
| /* |
| * SOME FINE POINTS: |
| * |
| * In the above code, we ignored the return value of jpeg_read_scanlines, |
| * which is the number of scanlines actually read. We could get away with |
| * this because we asked for only one line at a time and we weren't using |
| * a suspending data source. See libjpeg.doc for more info. |
| * |
| * We cheated a bit by calling alloc_sarray() after jpeg_start_decompress(); |
| * we should have done it beforehand to ensure that the space would be |
| * counted against the JPEG max_memory setting. In some systems the above |
| * code would risk an out-of-memory error. However, in general we don't |
| * know the output image dimensions before jpeg_start_decompress(), unless we |
| * call jpeg_calc_output_dimensions(). See libjpeg.doc for more about this. |
| * |
| * Scanlines are returned in the same order as they appear in the JPEG file, |
| * which is standardly top-to-bottom. If you must emit data bottom-to-top, |
| * you can use one of the virtual arrays provided by the JPEG memory manager |
| * to invert the data. See wrbmp.c for an example. |
| * |
| * As with compression, some operating modes may require temporary files. |
| * On some systems you may need to set up a signal handler to ensure that |
| * temporary files are deleted if the program is interrupted. See libjpeg.doc. |
| */ |
