Lines Matching full:will
136 which typically will write the data into a file; but the application can
155 output scaling ratio that will fit the image into the available screen size.
158 manager, which typically will read the data from a file; but other behaviors
192 interpretation of the components. Most applications will use RGB data
260 You will also need a structure representing a JPEG error handler. The part
265 handler. The default error handler will print JPEG error/warning messages
266 on stderr, and it will call exit() if a fatal error occurs.
281 if you are out of memory. In that case it will exit via the error handler;
362 a compression cycle. This will initialize internal state, allocate working
370 will be written. This is appropriate in most cases. If you think you might
391 your files to be compatible with everyone else's, you WILL use top-to-bottom
416 This will normally be equal to the number passed in, so you can usually
421 will cause the compressor to return before accepting all the passed lines.
423 stdio destination manager will NOT cause this to happen.
444 optimization, jpeg_finish_compress() will perform the additional passes using
446 quite a while to complete. With the default compression parameters, this will
456 destination manager, the new datastream will be written to the same target.
457 If you do not change any JPEG parameters, the new datastream will be written
467 jpeg_destroy_compress(). This will free all subsidiary memory (regardless of
496 This will return the object to an idle state, releasing any working memory.
500 responsibility; neither of these routines will call term_destination().
506 whack. Either of these two routines will return the object to a known state.
573 This will read the source datastream header markers, up to the beginning
581 below. The normal stdio source manager will NOT cause this to happen.
614 begin decompression. This will initialize internal state, allocate working
622 quantization, jpeg_start_decompress() will do everything needed before data
625 decompression parameters, this will not happen; jpeg_start_decompress() will
640 equals out_color_components. It is the number of JSAMPLE values that will be
643 Typically you will need to allocate data buffers to hold the incoming image.
644 You will need output_width * output_components JSAMPLEs per scanline in your
645 output buffer, and a total of output_height scanlines will be returned.
661 will return up to that many lines. The return value is the number of lines
663 formats", above. Don't forget that grayscale and color JPEGs will return
710 manager, the next image will be read from the same source.
745 installing the JPEG header files in a system directory, you will want to
751 library (only compression or only decompression), only that much code will be
769 it will try to grab extended memory for temp files, and that space will NOT be
804 already be set in cinfo). Many applications will only need to use
906 supply will be overwritten.
926 compressor will then write a JPEG file having one scan for each scan
972 routines will set up table slot 0 for luminance quality and table
1021 release v6, the compressor library will fill this in automatically;
1057 adhere to the JFIF or Adobe conventions, and the decoder will recognize these
1066 based on jpeg_color_space; typically it will be RGB or grayscale.
1084 If set TRUE, colormapped output will be delivered. Default is FALSE,
1085 meaning that full-color output will be delivered.
1157 to obtain the values that will result from the current parameter settings.
1158 This can be useful if you are trying to pick a scaling ratio that will get
1175 library will still work, but time will be wasted due to unnecessary data
1193 but it must be understood that such files will be unportable.
1218 will set the compression parameters to include or omit the APPn markers
1226 When told that the color space is UNKNOWN, the library will default to using
1257 CMYK files, you will have to deal with it in your application. We cannot
1263 operator. I am told that Photoshop 3.0 will write uninverted YCCK in
1264 EPS/JPEG files, and will omit the PS-level inversion. (But the data
1265 polarity used in bare JPEG files will not change in 3.0.) In either case,
1274 routines will cause a message to be printed on stderr, followed by exit().
1287 program by adjusting the maximum trace level that will be displayed.
1296 All of the error handling routines will receive a pointer to the JPEG object
1300 "err" field. Frequently, custom error handler routines will need to access
1316 generally this routine will exit() or longjmp() somewhere.
1347 jerror.h for the default texts. CAUTION: this table will almost certainly
1439 You will also need code to create a jpeg_destination_mgr struct, fill in its
1464 will occur immediately).
1507 is the best course of action --- this will allow the decompressor to output
1515 You will also need code to create a jpeg_source_mgr struct, fill in its method
1536 maximum amount of time spent in any one call to the library, so it will not
1542 and the data source or destination manager; you will always need a custom
1554 FALSE; typically it will not do anything else. This will cause the
1561 When forced to suspend, the compressor will backtrack to a convenient stopping
1562 point (usually the start of the current MCU); it will regenerate some output
1566 next_output_byte/free_in_buffer. The data beyond that point will be
1595 whole file during jpeg_finish_compress(), which will certainly result in
1604 This will cause the decompressor to return to its caller with an indication
1606 * jpeg_read_header(): will return JPEG_SUSPENDED.
1607 * jpeg_start_decompress(): will return FALSE, rather than its usual TRUE.
1608 * jpeg_read_scanlines(): will return the number of scanlines already
1610 * jpeg_finish_decompress(): will return FALSE, rather than its usual TRUE.
1615 Just as with compression, the decompressor will typically backtrack to a
1618 which is where the decompressor will backtrack to if FALSE is returned.
1632 additional skip distance somewhere else. The decompressor will immediately
1633 call fill_input_buffer(), which should return FALSE, which will cause a
1648 instead it will backtrack to the start of the marker and reprocess the whole
1679 Since fill_input_buffer() will set the pointer and count to refer to a new
1689 The library will never attempt to backtrack over a skip_input_data() call,
1718 will receive a final decoded image without any indication that the file was
1748 When scan_info is not NULL, the compression library will store DCT'd data
1749 into a buffer array as jpeg_write_scanlines() is called, and will emit all
1759 When buffered-image mode is not used, the decoder library will read all of
1764 input with version 5 of the IJG library will need to be modified to check
1821 will be incremented by the time control arrives back at jpeg_start_output()).
1853 events occurs. (If called after the EOI marker is reached, it will
1856 The library's output processing will automatically call jpeg_consume_input()
1891 number greater than the current input scan number, the output processor will
1895 target scan number, the library will just absorb the entire input file and
1903 waiting for input. (However, the library will not accept a target scan
1907 through the image, jpeg_consume_input() will store data into the buffered
1951 will avoid an extra output pass whenever the decoder is able (or nearly able)
1978 as the target scan, expecting that the scan will be small and will arrive
1993 * jpeg_finish_output() will read any markers following the target scan,
1997 * jpeg_finish_decompress() will read until the end of file, and thus can
2074 you should not do either of these things. This will save some nontrivial
2076 (These requirements exist because cinfo.colormap will always be non-NULL
2091 or equal to the current input scan number, jpeg_start_output() will attempt
2095 target scan is the only case in which jpeg_start_output() will consume input.
2099 for all JPEG images, even single-scan ones. This will work, but it is
2106 tested by calling jpeg_has_multiple_scans(), which will return a correct
2114 possible. If the JPEG memory manager has to use a temporary file, you will
2125 jpeg_start_decompress() before jpeg_consume_input() will consume more input;
2127 tables-only file this way, jpeg_consume_input() will return JPEG_REACHED_EOI
2129 If this happens, the decompressor will not read any more input until you call
2132 initial markers have been read: it will just return JPEG_SUSPENDED.
2146 and Huffman tables. In a situation where many images will be stored or
2161 that once the decoder has read a table, it will remember that table until a
2172 decompression objects, a quantization or Huffman table will be retained for
2184 calling jpeg_start_compress() will prevent the table from being written at
2194 will force all the sent_table fields to FALSE. (This is a safety feature to
2199 jpeg_write_tables(&cinfo). This will write an abbreviated datastream
2201 and Huffman tables that are currently defined in the compression object will
2203 sent_tables flags will be set TRUE.
2287 from jpeg_read_header(): it will be JPEG_HEADER_OK if an image was found,
2290 Note that jpeg_read_header() will not complain if you read an abbreviated
2335 (NOTE: the upcoming SPIFF standard will use APP8 markers; we recommend you
2341 By default, the IJG compression library will write a JFIF APP0 marker if the
2344 we don't recommend it. The decompression library will recognize JFIF and
2345 Adobe markers and will set the JPEG colorspace properly when one is found.
2353 "JPEG_APP0 + n" for APPn. (Actually, jpeg_write_marker will let you write
2372 forget to set cinfo.JFIF_minor_version = 2 so that the encoder will write the
2394 markers of interest will typically be near the head of the file and so will
2396 method, it will be used for the life of that decompression object
2406 than length_limit data bytes, only length_limit bytes will be saved; this
2418 will not exceed length_limit for the particular marker type. Note that these
2424 SOS marker at which jpeg_read_header stops; if so, the marker list will be
2437 will silently force the length up to the minimum it wants. (But you can set
2509 This notifies the library that you will be supplying raw data.
2527 value must be at least max_v_samp_factor*DCTSIZE, and the return value will
2550 cinfo->image_height) are 101x101 pixels. Then jpeg_start_compress() will
2564 destination module suspends, jpeg_write_raw_data() will return 0.
2573 The library will not convert to a different color space for you.
2591 module suspends, jpeg_read_raw_data() will return 0. You can also use
2606 and jpeg_read_scanlines(), call jpeg_read_coefficients(). This will read the
2628 If you use a suspending data source, jpeg_read_coefficients() will return
2638 the last jpeg_finish_output() call. The arrays will be available for your use
2668 resulting file will be invalid. For transcoding from an existing JPEG file,
2692 will occur inside jpeg_finish_compress or jpeg_start_decompress; those
2696 You can define a progress-monitor routine which will be called periodically
2697 by the library. No guarantees are made about how often this call will occur,
2699 At present, a call will occur once per MCU row, scanline, or sample row
2710 and set cinfo->progress to point to the struct. The callback will be called
2712 jpeg_create_compress or jpeg_create_decompress; the library will not change
2714 make sure it will live as long as the JPEG object does. Allocating from the
2715 JPEG memory manager with lifetime JPOOL_PERMANENT will work nicely.) You
2741 to know how many output passes will be demanded of it. Currently, the library
2742 sets total_passes based on the assumption that there will be one more output
2745 output pass is started. This means that total_passes will rise as additional
2748 will probably be more useful than using the library's value.
2763 Some data is allocated "permanently" and will not be freed until the JPEG
2766 memory manager yourself to allocate structures that will automatically be
2788 When using temporary files, the library will make the in-memory buffers for
2804 DOS will require a reboot to recover the memory.) Thus, with these memory
2805 managers, it's a good idea to provide a signal handler that will trap any
2840 quantization pixel buffer. The "fixed-size" data will be somewhat smaller
2842 color spaces will require different amounts of space.
2888 expect that few applications will need more than four or so.
2931 (These are the minimum requirements of the ANSI C standard.) Wider types will
2937 code work by modifying the typedefs in jmorecfg.h. However, you will probably
2942 unsigned char type is available. If char is wider than 8 bits, you will need
2972 model to compile cjpeg or djpeg by itself, but you will probably have to use
2974 performance. You *will* take a noticeable performance hit if you use a
2978 The JPEG library typically needs 2Kb-3Kb of stack space. It will also
2980 heap, but that doesn't count in this calculation). This figure will vary
2982 There is also about 5Kb-6Kb of constant data which will be allocated in the
2986 static data will account for several K of this, but that still leaves a good
2992 About 2K of the near heap space is "permanent" memory that will not be
