2 * "$Id: raster.c 7720 2008-07-11 22:46:21Z mike $"
4 * Raster file routines for CUPS.
6 * Copyright 2007-2011 by Apple Inc.
7 * Copyright 1997-2006 by Easy Software Products.
9 * This file is part of the CUPS Imaging library.
11 * These coded instructions, statements, and computer programs are the
12 * property of Apple Inc. and are protected by Federal copyright
13 * law. Distribution and use rights are outlined in the file "LICENSE.txt"
14 * which should have been included with this file. If this file is
15 * file is missing or damaged, see the license at "http://www.cups.org/".
17 * This file is subject to the Apple OS-Developed Software exception.
21 * cupsRasterClose() - Close a raster stream.
22 * cupsRasterOpen() - Open a raster stream using a file descriptor.
23 * cupsRasterOpenIO() - Open a raster stream using a callback function.
24 * cupsRasterReadHeader() - Read a raster page header and store it in a
25 * version 1 page header structure.
26 * cupsRasterReadHeader2() - Read a raster page header and store it in a
27 * version 2 page header structure.
28 * cupsRasterReadPixels() - Read raster pixels.
29 * cupsRasterWriteHeader() - Write a raster page header from a version 1
30 * page header structure.
31 * cupsRasterWriteHeader2() - Write a raster page header from a version 2
32 * page header structure.
33 * cupsRasterWritePixels() - Write raster pixels.
34 * cups_raster_read_header() - Read a raster page header.
35 * cups_raster_read() - Read through the raster buffer.
36 * cups_raster_update() - Update the raster header and row count for the
38 * cups_raster_write() - Write a row of compressed raster data...
39 * cups_read_fd() - Read bytes from a file.
40 * cups_swap() - Swap bytes in raster data...
41 * cups_write_fd() - Write bytes to a file.
45 * Include necessary headers...
48 #include "image-private.h"
49 #if defined(WIN32) || defined(__EMX__)
51 # include <winsock2.h> /* for htonl() definition */
54 #endif /* WIN32 || __EMX__ */
58 * Private structures...
61 struct _cups_raster_s
/**** Raster stream data ****/
63 unsigned sync
; /* Sync word from start of stream */
64 void *ctx
; /* File descriptor */
65 cups_raster_iocb_t iocb
; /* IO callback */
66 cups_mode_t mode
; /* Read/write mode */
67 cups_page_header2_t header
; /* Raster header for current page */
68 int count
, /* Current row run-length count */
69 remaining
, /* Remaining rows in page image */
70 bpp
; /* Bytes per pixel/color */
71 unsigned char *pixels
, /* Pixels for current row */
72 *pend
, /* End of pixel buffer */
73 *pcurrent
; /* Current byte in pixel buffer */
74 int compressed
, /* Non-zero if data is compressed */
75 swapped
; /* Non-zero if data is byte-swapped */
76 unsigned char *buffer
, /* Read/write buffer */
77 *bufptr
, /* Current (read) position in buffer */
78 *bufend
; /* End of current (read) buffer */
79 size_t bufsize
; /* Buffer size */
87 static int cups_raster_io(cups_raster_t
*r
, unsigned char *buf
, int bytes
);
88 static unsigned cups_raster_read_header(cups_raster_t
*r
);
89 static int cups_raster_read(cups_raster_t
*r
, unsigned char *buf
,
91 static void cups_raster_update(cups_raster_t
*r
);
92 static int cups_raster_write(cups_raster_t
*r
,
93 const unsigned char *pixels
);
94 static ssize_t
cups_read_fd(void *ctx
, unsigned char *buf
, size_t bytes
);
95 static void cups_swap(unsigned char *buf
, int bytes
);
96 static ssize_t
cups_write_fd(void *ctx
, unsigned char *buf
, size_t bytes
);
100 * 'cupsRasterClose()' - Close a raster stream.
102 * The file descriptor associated with the raster stream must be closed
103 * separately as needed.
107 cupsRasterClose(cups_raster_t
*r
) /* I - Stream to close */
123 * 'cupsRasterOpen()' - Open a raster stream using a file descriptor.
125 * This function associates a raster stream with the given file descriptor.
126 * For most printer driver filters, "fd" will be 0 (stdin). For most raster
127 * image processor (RIP) filters that generate raster data, "fd" will be 1
130 * When writing raster data, the @code CUPS_RASTER_WRITE@,
131 * @code CUPS_RASTER_WRITE_COMPRESS@, or @code CUPS_RASTER_WRITE_PWG@ mode can
132 * be used - compressed and PWG output is generally 25-50% smaller but adds a
133 * 100-300% execution time overhead.
136 cups_raster_t
* /* O - New stream */
137 cupsRasterOpen(int fd
, /* I - File descriptor */
138 cups_mode_t mode
) /* I - Mode - @code CUPS_RASTER_READ@,
139 @code CUPS_RASTER_WRITE@,
140 @code CUPS_RASTER_WRITE_COMPRESSED@,
141 or @code CUPS_RASTER_WRITE_PWG@ */
143 if (mode
== CUPS_RASTER_READ
)
144 return (cupsRasterOpenIO(cups_read_fd
, (void *)((intptr_t)fd
), mode
));
146 return (cupsRasterOpenIO(cups_write_fd
, (void *)((intptr_t)fd
), mode
));
151 * 'cupsRasterOpenIO()' - Open a raster stream using a callback function.
153 * This function associates a raster stream with the given callback function and
156 * When writing raster data, the @code CUPS_RASTER_WRITE@,
157 * @code CUPS_RASTER_WRITE_COMPRESS@, or @code CUPS_RASTER_WRITE_PWG@ mode can
158 * be used - compressed and PWG output is generally 25-50% smaller but adds a
159 * 100-300% execution time overhead.
162 cups_raster_t
* /* O - New stream */
164 cups_raster_iocb_t iocb
, /* I - Read/write callback */
165 void *ctx
, /* I - Context pointer for callback */
166 cups_mode_t mode
) /* I - Mode - @code CUPS_RASTER_READ@,
167 @code CUPS_RASTER_WRITE@,
168 @code CUPS_RASTER_WRITE_COMPRESSED@,
169 or @code CUPS_RASTER_WRITE_PWG@ */
171 cups_raster_t
*r
; /* New stream */
174 _cupsRasterClearError();
176 if ((r
= calloc(sizeof(cups_raster_t
), 1)) == NULL
)
178 _cupsRasterAddError("Unable to allocate memory for raster stream: %s\n",
187 if (mode
== CUPS_RASTER_READ
)
190 * Open for read - get sync word...
193 if (cups_raster_io(r
, (unsigned char *)&(r
->sync
), sizeof(r
->sync
)) !=
196 _cupsRasterAddError("Unable to read header from raster stream: %s\n",
202 if (r
->sync
!= CUPS_RASTER_SYNC
&&
203 r
->sync
!= CUPS_RASTER_REVSYNC
&&
204 r
->sync
!= CUPS_RASTER_SYNCv1
&&
205 r
->sync
!= CUPS_RASTER_REVSYNCv1
&&
206 r
->sync
!= CUPS_RASTER_SYNCv2
&&
207 r
->sync
!= CUPS_RASTER_REVSYNCv2
)
209 _cupsRasterAddError("Unknown raster format %08x!\n", r
->sync
);
214 if (r
->sync
== CUPS_RASTER_SYNCv2
||
215 r
->sync
== CUPS_RASTER_REVSYNCv2
)
218 if (r
->sync
== CUPS_RASTER_REVSYNC
||
219 r
->sync
== CUPS_RASTER_REVSYNCv1
||
220 r
->sync
== CUPS_RASTER_REVSYNCv2
)
223 DEBUG_printf(("r->swapped=%d, r->sync=%08x\n", r
->swapped
, r
->sync
));
228 * Open for write - put sync word...
234 case CUPS_RASTER_WRITE
:
235 r
->sync
= CUPS_RASTER_SYNC
;
238 case CUPS_RASTER_WRITE_COMPRESSED
:
240 r
->sync
= CUPS_RASTER_SYNCv2
;
243 case CUPS_RASTER_WRITE_PWG
:
245 r
->sync
= htonl(CUPS_RASTER_SYNC_PWG
);
246 r
->swapped
= r
->sync
!= CUPS_RASTER_SYNC_PWG
;
250 if (cups_raster_io(r
, (unsigned char *)&(r
->sync
), sizeof(r
->sync
))
253 _cupsRasterAddError("Unable to write raster stream header: %s\n",
265 * 'cupsRasterReadHeader()' - Read a raster page header and store it in a
266 * version 1 page header structure.
268 * This function is deprecated. Use @link cupsRasterReadHeader2@ instead.
270 * Version 1 page headers were used in CUPS 1.0 and 1.1 and contain a subset
271 * of the version 2 page header data. This function handles reading version 2
272 * page headers and copying only the version 1 data into the provided buffer.
277 unsigned /* O - 1 on success, 0 on failure/end-of-file */
278 cupsRasterReadHeader(
279 cups_raster_t
*r
, /* I - Raster stream */
280 cups_page_header_t
*h
) /* I - Pointer to header data */
283 * Get the raster header...
286 if (!cups_raster_read_header(r
))
290 * Copy the header to the user-supplied buffer...
293 memcpy(h
, &(r
->header
), sizeof(cups_page_header_t
));
300 * 'cupsRasterReadHeader2()' - Read a raster page header and store it in a
301 * version 2 page header structure.
303 * @since CUPS 1.2/Mac OS X 10.5@
306 unsigned /* O - 1 on success, 0 on failure/end-of-file */
307 cupsRasterReadHeader2(
308 cups_raster_t
*r
, /* I - Raster stream */
309 cups_page_header2_t
*h
) /* I - Pointer to header data */
312 * Get the raster header...
315 if (!cups_raster_read_header(r
))
319 * Copy the header to the user-supplied buffer...
322 memcpy(h
, &(r
->header
), sizeof(cups_page_header2_t
));
329 * 'cupsRasterReadPixels()' - Read raster pixels.
331 * For best performance, filters should read one or more whole lines.
332 * The "cupsBytesPerLine" value from the page header can be used to allocate
333 * the line buffer and as the number of bytes to read.
336 unsigned /* O - Number of bytes read */
337 cupsRasterReadPixels(cups_raster_t
*r
, /* I - Raster stream */
338 unsigned char *p
, /* I - Pointer to pixel buffer */
339 unsigned len
) /* I - Number of bytes to read */
341 int bytes
; /* Bytes read */
342 unsigned cupsBytesPerLine
; /* cupsBytesPerLine value */
343 unsigned remaining
; /* Bytes remaining */
344 unsigned char *ptr
, /* Pointer to read buffer */
345 byte
, /* Byte from file */
346 *temp
; /* Pointer into buffer */
347 int count
; /* Repetition count */
350 if (r
== NULL
|| r
->mode
!= CUPS_RASTER_READ
|| r
->remaining
== 0)
356 * Read without compression...
359 r
->remaining
-= len
/ r
->header
.cupsBytesPerLine
;
361 if (cups_raster_io(r
, p
, len
) < (ssize_t
)len
)
365 * Swap bytes as needed...
369 (r
->header
.cupsBitsPerColor
== 16 ||
370 r
->header
.cupsBitsPerPixel
== 12 ||
371 r
->header
.cupsBitsPerPixel
== 16))
382 * Read compressed data...
386 cupsBytesPerLine
= r
->header
.cupsBytesPerLine
;
388 while (remaining
> 0 && r
->remaining
> 0)
393 * Need to read a new row...
396 if (remaining
== cupsBytesPerLine
)
402 * Read using a modified PackBits compression...
405 if (!cups_raster_read(r
, &byte
, 1))
414 bytes
= cupsBytesPerLine
;
419 * Get a new repeat count...
422 if (!cups_raster_read(r
, &byte
, 1))
428 * Copy N literal pixels...
431 count
= (257 - byte
) * r
->bpp
;
436 if (!cups_raster_read(r
, temp
, count
))
445 * Repeat the next N bytes...
448 count
= (byte
+ 1) * r
->bpp
;
457 if (!cups_raster_read(r
, temp
, r
->bpp
))
465 memcpy(temp
, temp
- r
->bpp
, r
->bpp
);
473 * Swap bytes as needed...
476 if ((r
->header
.cupsBitsPerColor
== 16 ||
477 r
->header
.cupsBitsPerPixel
== 12 ||
478 r
->header
.cupsBitsPerPixel
== 16) &&
480 cups_swap(ptr
, bytes
);
486 if (remaining
>= cupsBytesPerLine
)
488 bytes
= cupsBytesPerLine
;
489 r
->pcurrent
= r
->pixels
;
496 r
->pcurrent
= r
->pixels
+ bytes
;
500 * Copy data as needed...
504 memcpy(p
, ptr
, bytes
);
509 * Copy fragment from buffer...
512 if ((unsigned)(bytes
= r
->pend
- r
->pcurrent
) > remaining
)
515 memcpy(p
, r
->pcurrent
, bytes
);
516 r
->pcurrent
+= bytes
;
518 if (r
->pcurrent
>= r
->pend
)
520 r
->pcurrent
= r
->pixels
;
535 * 'cupsRasterWriteHeader()' - Write a raster page header from a version 1 page
538 * This function is deprecated. Use @link cupsRasterWriteHeader2@ instead.
543 unsigned /* O - 1 on success, 0 on failure */
544 cupsRasterWriteHeader(
545 cups_raster_t
*r
, /* I - Raster stream */
546 cups_page_header_t
*h
) /* I - Raster page header */
548 if (r
== NULL
|| r
->mode
== CUPS_RASTER_READ
)
552 * Make a copy of the header, and compute the number of raster
553 * lines in the page image...
556 memset(&(r
->header
), 0, sizeof(r
->header
));
557 memcpy(&(r
->header
), h
, sizeof(cups_page_header_t
));
559 cups_raster_update(r
);
562 * Write the raster header...
565 if (r
->mode
== CUPS_RASTER_WRITE_PWG
)
568 * PWG raster data is always network byte order with most of the page header
572 cups_page_header2_t fh
; /* File page header */
574 memset(&fh
, 0, sizeof(fh
));
575 fh
.HWResolution
[0] = htonl(r
->header
.HWResolution
[0]);
576 fh
.HWResolution
[1] = htonl(r
->header
.HWResolution
[1]);
577 fh
.cupsWidth
= htonl(r
->header
.cupsWidth
);
578 fh
.cupsHeight
= htonl(r
->header
.cupsHeight
);
579 fh
.cupsBitsPerColor
= htonl(r
->header
.cupsBitsPerColor
);
580 fh
.cupsBitsPerPixel
= htonl(r
->header
.cupsBitsPerPixel
);
581 fh
.cupsBytesPerLine
= htonl(r
->header
.cupsBytesPerLine
);
582 fh
.cupsColorOrder
= htonl(r
->header
.cupsColorOrder
);
583 fh
.cupsColorSpace
= htonl(r
->header
.cupsColorSpace
);
585 return (cups_raster_io(r
, (unsigned char *)&fh
, sizeof(fh
)) == sizeof(fh
));
588 return (cups_raster_io(r
, (unsigned char *)&(r
->header
), sizeof(r
->header
))
589 == sizeof(r
->header
));
594 * 'cupsRasterWriteHeader2()' - Write a raster page header from a version 2
595 * page header structure.
597 * The page header can be initialized using @link cupsRasterInterpretPPD@.
599 * @since CUPS 1.2/Mac OS X 10.5@
602 unsigned /* O - 1 on success, 0 on failure */
603 cupsRasterWriteHeader2(
604 cups_raster_t
*r
, /* I - Raster stream */
605 cups_page_header2_t
*h
) /* I - Raster page header */
607 if (r
== NULL
|| r
->mode
== CUPS_RASTER_READ
)
611 * Make a copy of the header, and compute the number of raster
612 * lines in the page image...
615 memcpy(&(r
->header
), h
, sizeof(cups_page_header2_t
));
617 cups_raster_update(r
);
620 * Write the raster header...
623 if (r
->mode
== CUPS_RASTER_WRITE_PWG
)
626 * PWG raster data is always network byte order with most of the page header
630 cups_page_header2_t fh
; /* File page header */
632 memset(&fh
, 0, sizeof(fh
));
633 fh
.HWResolution
[0] = htonl(r
->header
.HWResolution
[0]);
634 fh
.HWResolution
[1] = htonl(r
->header
.HWResolution
[1]);
635 fh
.cupsWidth
= htonl(r
->header
.cupsWidth
);
636 fh
.cupsHeight
= htonl(r
->header
.cupsHeight
);
637 fh
.cupsBitsPerColor
= htonl(r
->header
.cupsBitsPerColor
);
638 fh
.cupsBitsPerPixel
= htonl(r
->header
.cupsBitsPerPixel
);
639 fh
.cupsBytesPerLine
= htonl(r
->header
.cupsBytesPerLine
);
640 fh
.cupsColorOrder
= htonl(r
->header
.cupsColorOrder
);
641 fh
.cupsColorSpace
= htonl(r
->header
.cupsColorSpace
);
643 return (cups_raster_io(r
, (unsigned char *)&fh
, sizeof(fh
)) == sizeof(fh
));
646 return (cups_raster_io(r
, (unsigned char *)&(r
->header
), sizeof(r
->header
))
647 == sizeof(r
->header
));
652 * 'cupsRasterWritePixels()' - Write raster pixels.
654 * For best performance, filters should write one or more whole lines.
655 * The "cupsBytesPerLine" value from the page header can be used to allocate
656 * the line buffer and as the number of bytes to write.
659 unsigned /* O - Number of bytes written */
660 cupsRasterWritePixels(cups_raster_t
*r
, /* I - Raster stream */
661 unsigned char *p
, /* I - Bytes to write */
662 unsigned len
)/* I - Number of bytes to write */
664 int bytes
; /* Bytes read */
665 unsigned remaining
; /* Bytes remaining */
668 DEBUG_printf(("cupsRasterWritePixels(r=%p, p=%p, len=%u), remaining=%u\n",
669 r
, p
, len
, r
->remaining
));
671 if (r
== NULL
|| r
->mode
== CUPS_RASTER_READ
|| r
->remaining
== 0)
677 * Without compression, just write the raster data raw unless the data needs
681 r
->remaining
-= len
/ r
->header
.cupsBytesPerLine
;
684 (r
->header
.cupsBitsPerColor
== 16 ||
685 r
->header
.cupsBitsPerPixel
== 12 ||
686 r
->header
.cupsBitsPerPixel
== 16))
688 unsigned char *bufptr
; /* Pointer into write buffer */
689 unsigned count
; /* Remaining count */
692 * Allocate a write buffer as needed...
695 if ((size_t)len
> r
->bufsize
)
698 bufptr
= realloc(r
->buffer
, len
);
700 bufptr
= malloc(len
);
710 * Byte swap the pixels...
713 for (bufptr
= r
->buffer
, count
= len
; count
> 1; count
-= 2, bufptr
+= 2)
719 if (count
) /* This should never happen... */
723 * Write the byte-swapped buffer...
726 return (cups_raster_io(r
, r
->buffer
, len
));
729 return (cups_raster_io(r
, p
, len
));
733 * Otherwise, compress each line...
736 for (remaining
= len
; remaining
> 0; remaining
-= bytes
, p
+= bytes
)
739 * Figure out the number of remaining bytes on the current line...
742 if ((bytes
= remaining
) > (r
->pend
- r
->pcurrent
))
743 bytes
= r
->pend
- r
->pcurrent
;
748 * Check to see if this line is the same as the previous line...
751 if (memcmp(p
, r
->pcurrent
, bytes
))
753 if (!cups_raster_write(r
, r
->pixels
))
761 * Mark more bytes as the same...
764 r
->pcurrent
+= bytes
;
766 if (r
->pcurrent
>= r
->pend
)
769 * Increase the repeat count...
773 r
->pcurrent
= r
->pixels
;
776 * Flush out this line if it is the last one...
781 if (r
->remaining
== 0)
782 return (cups_raster_write(r
, r
->pixels
));
783 else if (r
->count
== 256)
785 if (cups_raster_write(r
, r
->pixels
) == 0)
799 * Copy the raster data to the buffer...
802 memcpy(r
->pcurrent
, p
, bytes
);
804 r
->pcurrent
+= bytes
;
806 if (r
->pcurrent
>= r
->pend
)
809 * Increase the repeat count...
813 r
->pcurrent
= r
->pixels
;
816 * Flush out this line if it is the last one...
821 if (r
->remaining
== 0)
822 return (cups_raster_write(r
, r
->pixels
));
832 * 'cups_raster_read_header()' - Read a raster page header.
835 static unsigned /* O - 1 on success, 0 on fail */
836 cups_raster_read_header(
837 cups_raster_t
*r
) /* I - Raster stream */
839 int len
; /* Length for read/swap */
842 if (r
== NULL
|| r
->mode
!= CUPS_RASTER_READ
)
846 * Get the length of the raster header...
849 if (r
->sync
== CUPS_RASTER_SYNCv1
|| r
->sync
== CUPS_RASTER_REVSYNCv1
)
850 len
= sizeof(cups_page_header_t
);
852 len
= sizeof(cups_page_header2_t
);
858 memset(&(r
->header
), 0, sizeof(r
->header
));
860 if (cups_raster_read(r
, (unsigned char *)&(r
->header
), len
) < len
)
864 * Swap bytes as needed...
869 unsigned *s
, /* Current word */
870 temp
; /* Temporary copy */
873 DEBUG_puts("Swapping header bytes...");
875 for (len
= 81, s
= &(r
->header
.AdvanceDistance
);
879 DEBUG_printf(("%08x =>", *s
));
882 *s
= ((temp
& 0xff) << 24) |
883 ((temp
& 0xff00) << 8) |
884 ((temp
& 0xff0000) >> 8) |
885 ((temp
& 0xff000000) >> 24);
887 DEBUG_printf((" %08x\n", *s
));
892 * Update the header and row count...
895 cups_raster_update(r
);
902 * 'cups_raster_io()' - Read/write bytes from a context, handling interruptions.
905 static int /* O - Bytes read or -1 */
906 cups_raster_io(cups_raster_t
*r
, /* I - Raster stream */
907 unsigned char *buf
, /* I - Buffer for read/write */
908 int bytes
) /* I - Number of bytes to read/write */
910 ssize_t count
; /* Number of bytes read/written */
911 size_t total
; /* Total bytes read/written */
914 DEBUG_printf(("4cups_raster_io(r=%p, buf=%p, bytes=%d)", r
, buf
, bytes
));
916 for (total
= 0; total
< bytes
; total
+= count
, buf
+= count
)
918 count
= (*r
->iocb
)(r
->ctx
, buf
, bytes
- total
);
920 DEBUG_printf(("5cups_raster_io: count=%d, total=%d", (int)count
,
933 * 'cups_raster_read()' - Read through the raster buffer.
936 static int /* O - Number of bytes read */
937 cups_raster_read(cups_raster_t
*r
, /* I - Raster stream */
938 unsigned char *buf
, /* I - Buffer */
939 int bytes
) /* I - Number of bytes to read */
941 int count
, /* Number of bytes read */
942 remaining
, /* Remaining bytes in buffer */
943 total
; /* Total bytes read */
946 DEBUG_printf(("cups_raster_read(r=%p, buf=%p, bytes=%d)\n", r
, buf
, bytes
));
949 return (cups_raster_io(r
, buf
, bytes
));
952 * Allocate a read buffer as needed...
955 count
= 2 * r
->header
.cupsBytesPerLine
;
957 if ((size_t)count
> r
->bufsize
)
959 int offset
= r
->bufptr
- r
->buffer
; /* Offset to current start of buffer */
960 int end
= r
->bufend
- r
->buffer
; /* Offset to current end of buffer */
961 unsigned char *rptr
; /* Pointer in read buffer */
964 rptr
= realloc(r
->buffer
, count
);
966 rptr
= malloc(count
);
972 r
->bufptr
= rptr
+ offset
;
973 r
->bufend
= rptr
+ end
;
978 * Loop until we have read everything...
981 for (total
= 0, remaining
= r
->bufend
- r
->bufptr
;
983 total
+= count
, buf
+= count
)
985 count
= bytes
- total
;
987 DEBUG_printf(("count=%d, remaining=%d, buf=%p, bufptr=%p, bufend=%p...\n",
988 count
, remaining
, buf
, r
->bufptr
, r
->bufend
));
995 * Read into the raster buffer and then copy...
998 remaining
= (*r
->iocb
)(r
->ctx
, r
->buffer
, r
->bufsize
);
1002 r
->bufptr
= r
->buffer
;
1003 r
->bufend
= r
->buffer
+ remaining
;
1008 * Read directly into "buf"...
1011 count
= (*r
->iocb
)(r
->ctx
, buf
, count
);
1021 * Copy bytes from raster buffer to "buf"...
1024 if (count
> remaining
)
1033 *buf
= *(r
->bufptr
)++;
1036 else if (count
< 128)
1039 * Copy up to 127 bytes without using memcpy(); this is
1040 * faster because it avoids an extra function call and is
1041 * often further optimized by the compiler...
1044 unsigned char *bufptr
; /* Temporary buffer pointer */
1049 for (bufptr
= r
->bufptr
; count
> 0; count
--, total
++)
1057 * Use memcpy() for a large read...
1060 memcpy(buf
, r
->bufptr
, count
);
1071 * 'cups_raster_update()' - Update the raster header and row count for the
1076 cups_raster_update(cups_raster_t
*r
) /* I - Raster stream */
1078 if (r
->sync
== CUPS_RASTER_SYNCv1
|| r
->sync
== CUPS_RASTER_REVSYNCv1
||
1079 r
->header
.cupsNumColors
== 0)
1082 * Set the "cupsNumColors" field according to the colorspace...
1085 switch (r
->header
.cupsColorSpace
)
1087 case CUPS_CSPACE_W
:
1088 case CUPS_CSPACE_K
:
1089 case CUPS_CSPACE_WHITE
:
1090 case CUPS_CSPACE_GOLD
:
1091 case CUPS_CSPACE_SILVER
:
1092 case CUPS_CSPACE_SW
:
1093 r
->header
.cupsNumColors
= 1;
1096 case CUPS_CSPACE_RGB
:
1097 case CUPS_CSPACE_CMY
:
1098 case CUPS_CSPACE_YMC
:
1099 case CUPS_CSPACE_CIEXYZ
:
1100 case CUPS_CSPACE_CIELab
:
1101 case CUPS_CSPACE_SRGB
:
1102 case CUPS_CSPACE_ADOBERGB
:
1103 case CUPS_CSPACE_ICC1
:
1104 case CUPS_CSPACE_ICC2
:
1105 case CUPS_CSPACE_ICC3
:
1106 case CUPS_CSPACE_ICC4
:
1107 case CUPS_CSPACE_ICC5
:
1108 case CUPS_CSPACE_ICC6
:
1109 case CUPS_CSPACE_ICC7
:
1110 case CUPS_CSPACE_ICC8
:
1111 case CUPS_CSPACE_ICC9
:
1112 case CUPS_CSPACE_ICCA
:
1113 case CUPS_CSPACE_ICCB
:
1114 case CUPS_CSPACE_ICCC
:
1115 case CUPS_CSPACE_ICCD
:
1116 case CUPS_CSPACE_ICCE
:
1117 case CUPS_CSPACE_ICCF
:
1118 r
->header
.cupsNumColors
= 3;
1121 case CUPS_CSPACE_RGBA
:
1122 case CUPS_CSPACE_RGBW
:
1123 case CUPS_CSPACE_CMYK
:
1124 case CUPS_CSPACE_YMCK
:
1125 case CUPS_CSPACE_KCMY
:
1126 case CUPS_CSPACE_GMCK
:
1127 case CUPS_CSPACE_GMCS
:
1128 r
->header
.cupsNumColors
= 4;
1131 case CUPS_CSPACE_KCMYcm
:
1132 if (r
->header
.cupsBitsPerPixel
< 8)
1133 r
->header
.cupsNumColors
= 6;
1135 r
->header
.cupsNumColors
= 4;
1138 case CUPS_CSPACE_DEVICE1
:
1139 case CUPS_CSPACE_DEVICE2
:
1140 case CUPS_CSPACE_DEVICE3
:
1141 case CUPS_CSPACE_DEVICE4
:
1142 case CUPS_CSPACE_DEVICE5
:
1143 case CUPS_CSPACE_DEVICE6
:
1144 case CUPS_CSPACE_DEVICE7
:
1145 case CUPS_CSPACE_DEVICE8
:
1146 case CUPS_CSPACE_DEVICE9
:
1147 case CUPS_CSPACE_DEVICEA
:
1148 case CUPS_CSPACE_DEVICEB
:
1149 case CUPS_CSPACE_DEVICEC
:
1150 case CUPS_CSPACE_DEVICED
:
1151 case CUPS_CSPACE_DEVICEE
:
1152 case CUPS_CSPACE_DEVICEF
:
1153 r
->header
.cupsNumColors
= r
->header
.cupsColorSpace
-
1154 CUPS_CSPACE_DEVICE1
+ 1;
1160 * Set the number of bytes per pixel/color...
1163 if (r
->header
.cupsColorOrder
== CUPS_ORDER_CHUNKED
)
1164 r
->bpp
= (r
->header
.cupsBitsPerPixel
+ 7) / 8;
1166 r
->bpp
= (r
->header
.cupsBitsPerColor
+ 7) / 8;
1169 * Set the number of remaining rows...
1172 if (r
->header
.cupsColorOrder
== CUPS_ORDER_PLANAR
)
1173 r
->remaining
= r
->header
.cupsHeight
* r
->header
.cupsNumColors
;
1175 r
->remaining
= r
->header
.cupsHeight
;
1178 * Allocate the compression buffer...
1183 if (r
->pixels
!= NULL
)
1186 r
->pixels
= calloc(r
->header
.cupsBytesPerLine
, 1);
1187 r
->pcurrent
= r
->pixels
;
1188 r
->pend
= r
->pixels
+ r
->header
.cupsBytesPerLine
;
1195 * 'cups_raster_write()' - Write a row of compressed raster data...
1198 static int /* O - Number of bytes written */
1200 cups_raster_t
*r
, /* I - Raster stream */
1201 const unsigned char *pixels
) /* I - Pixel data to write */
1203 const unsigned char *start
, /* Start of sequence */
1204 *ptr
, /* Current pointer in sequence */
1205 *pend
, /* End of raster buffer */
1206 *plast
; /* Pointer to last pixel */
1207 unsigned char *wptr
; /* Pointer into write buffer */
1208 int bpp
, /* Bytes per pixel */
1212 DEBUG_printf(("cups_raster_write(r=%p, pixels=%p)\n", r
, pixels
));
1215 * Allocate a write buffer as needed...
1218 count
= r
->header
.cupsBytesPerLine
* 2;
1219 if ((size_t)count
> r
->bufsize
)
1222 wptr
= realloc(r
->buffer
, count
);
1224 wptr
= malloc(count
);
1234 * Write the row repeat count...
1238 pend
= pixels
+ r
->header
.cupsBytesPerLine
;
1241 *wptr
++ = r
->count
- 1;
1244 * Write using a modified TIFF "packbits" compression...
1247 for (ptr
= pixels
; ptr
< pend
;)
1255 * Encode a single pixel at the end...
1259 for (count
= bpp
; count
> 0; count
--)
1262 else if (!memcmp(start
, ptr
, bpp
))
1265 * Encode a sequence of repeating pixels...
1268 for (count
= 2; count
< 128 && ptr
< plast
; count
++, ptr
+= bpp
)
1269 if (memcmp(ptr
, ptr
+ bpp
, bpp
))
1272 *wptr
++ = count
- 1;
1273 for (count
= bpp
; count
> 0; count
--)
1279 * Encode a sequence of non-repeating pixels...
1282 for (count
= 1; count
< 127 && ptr
< plast
; count
++, ptr
+= bpp
)
1283 if (!memcmp(ptr
, ptr
+ bpp
, bpp
))
1286 if (ptr
>= plast
&& count
< 128)
1292 *wptr
++ = 257 - count
;
1295 memcpy(wptr
, start
, count
);
1300 return (cups_raster_io(r
, r
->buffer
, wptr
- r
->buffer
));
1305 * 'cups_read_fd()' - Read bytes from a file.
1308 static ssize_t
/* O - Bytes read or -1 */
1309 cups_read_fd(void *ctx
, /* I - File descriptor as pointer */
1310 unsigned char *buf
, /* I - Buffer for read */
1311 size_t bytes
) /* I - Maximum number of bytes to read */
1313 int fd
= (int)((intptr_t)ctx
);
1314 /* File descriptor */
1315 ssize_t count
; /* Number of bytes read */
1318 while ((count
= read(fd
, buf
, bytes
)) < 0)
1319 if (errno
!= EINTR
&& errno
!= EAGAIN
)
1327 * 'cups_swap()' - Swap bytes in raster data...
1331 cups_swap(unsigned char *buf
, /* I - Buffer to swap */
1332 int bytes
) /* I - Number of bytes to swap */
1334 unsigned char even
, odd
; /* Temporary variables */
1353 * 'cups_write_fd()' - Write bytes to a file.
1356 static ssize_t
/* O - Bytes written or -1 */
1357 cups_write_fd(void *ctx
, /* I - File descriptor pointer */
1358 unsigned char *buf
, /* I - Bytes to write */
1359 size_t bytes
) /* I - Number of bytes to write */
1361 int fd
= (int)((intptr_t)ctx
);
1362 /* File descriptor */
1363 ssize_t count
; /* Number of bytes written */
1366 while ((count
= write(fd
, buf
, bytes
)) < 0)
1367 if (errno
!= EINTR
&& errno
!= EAGAIN
)
1375 * End of "$Id: raster.c 7720 2008-07-11 22:46:21Z mike $".