1 #if defined (APDK_LJJETREADY) || defined (APDK_QUICKCONNECT) || defined (APDK_PSCRIPT)
5 * Copyright (C) 2001, Dorian Goldstein, Thomas G. Lane.
7 * This file contains compression data destination routines for the case of
8 * This file is identicle with IJG's built in destination file manager in
9 * every respect but 1... instead fo emmiting data to a file
10 * it facilitates definition of a callback function.
13 /* this is not a core library module, so it doesn't define JPEG_INTERNALS */
19 /* Expanded data destination object for stdio output */
22 struct jpeg_destination_mgr pub; /* public fields */
24 JOCTET * outbuff; // target output buffer
25 JOCTET * buffer; // start of internal buffer
26 UINT16 size_outbuff; // current size of target output buffer
27 JMETHOD (void, flush_output_buffer_callback, (JOCTET *outbuf, JOCTET* buffer, size_t size));
30 typedef my_destination_mgr * my_dest_ptr;
32 #define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */
36 * Initialize destination --- called by jpeg_start_compress
37 * before any data is actually written.
41 init_destination (j_compress_ptr cinfo)
43 my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
45 /* Allocate the output buffer --- it will be released when done with image */
46 dest->buffer = (JOCTET *)
47 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
48 OUTPUT_BUF_SIZE * SIZEOF(JOCTET));
50 dest->pub.next_output_byte = dest->buffer;
51 dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
56 * Empty the output buffer --- called whenever buffer fills up.
58 * In typical applications, this should write the entire output buffer
59 * (ignoring the current state of next_output_byte & free_in_buffer),
60 * reset the pointer & count to the start of the buffer, and return TRUE
61 * indicating that the buffer has been dumped.
63 * In applications that need to be able to suspend compression due to output
64 * overrun, a FALSE return indicates that the buffer cannot be emptied now.
65 * In this situation, the compressor will return to its caller (possibly with
66 * an indication that it has not accepted all the supplied scanlines). The
67 * application should resume compression after it has made more room in the
68 * output buffer. Note that there are substantial restrictions on the use of
69 * suspension --- see the documentation.
71 * When suspending, the compressor will back up to a convenient restart point
72 * (typically the start of the current MCU). next_output_byte & free_in_buffer
73 * indicate where the restart point will be if the current call returns FALSE.
74 * Data beyond this point will be regenerated after resumption, so do not
75 * write it out when emptying the buffer externally.
79 empty_output_buffer (j_compress_ptr cinfo)
81 my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
83 // DG Temp if (dest->flush_output_buffer_callback == NULL) {
84 // DG Temp if (dest->outbuff) {
85 // DG Temp MEMCOPY(dest->outbuff + dest->size_outbuff, dest->buffer, OUTPUT_BUF_SIZE);
86 // DG Temp dest->size_outbuff += OUTPUT_BUF_SIZE;
89 // DG Temp (*dest->flush_output_buffer_callback)(dest->buffer, OUTPUT_BUF_SIZE);
92 (*dest->flush_output_buffer_callback)(dest->outbuff, dest->buffer, OUTPUT_BUF_SIZE);
95 dest->pub.next_output_byte = dest->buffer;
96 dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
103 * Terminate destination --- called by jpeg_finish_compress
104 * after all data has been written. Usually needs to flush buffer.
106 * NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
107 * application must deal with any cleanup that should happen even
112 term_destination (j_compress_ptr cinfo)
114 my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
115 size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
117 /* Write any data remaining in the buffer */
119 // DG Temp if (dest->flush_output_buffer_callback == NULL) {
120 // DG Temp if (dest->outbuff) {
121 // DG Temp MEMCOPY(dest->outbuff + dest->size_outbuff, dest->buffer, datacount);
122 // DG Temp dest->size_outbuff += datacount;
125 // DG Temp (*dest->flush_output_buffer_callback)(dest->buffer, datacount);
128 (*dest->flush_output_buffer_callback)(dest->outbuff, dest->buffer, datacount);
134 * Prepare for output to a stdio stream.
135 * The caller must have already opened the stream, and is responsible
136 * for closing it after finishing compression.
140 jpeg_buffer_dest (j_compress_ptr cinfo, JOCTET* outbuff, void* flush_output_buffer_callback)
144 /* The destination object is made permanent so that multiple JPEG images
145 * can be written to the same file without re-executing jpeg_stdio_dest.
146 * This makes it dangerous to use this manager and a different destination
147 * manager serially with the same JPEG object, because their private object
148 * sizes may be different. Caveat programmer.
150 if (cinfo->dest == NULL) { /* first time for this JPEG object? */
151 cinfo->dest = (struct jpeg_destination_mgr *)
152 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
153 SIZEOF(my_destination_mgr));
156 dest = (my_dest_ptr) cinfo->dest;
157 dest->pub.init_destination = init_destination;
158 dest->pub.empty_output_buffer = empty_output_buffer;
159 dest->pub.term_destination = term_destination;
161 dest->outbuff = outbuff;
162 dest->size_outbuff = 0;
163 dest->flush_output_buffer_callback = flush_output_buffer_callback;
164 //(*dest->flush_output_buffer_callback)(-1 , -1);
168 jpeg_buffer_size_dest (j_compress_ptr cinfo)
170 my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
172 return dest->size_outbuff;
174 #endif // APDK_LJJETREADY || APDK_QUICKCONNECT || APDK_PSCRIPT