mirror of https://github.com/opencv/opencv.git
Open Source Computer Vision Library
https://opencv.org/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
262 lines
7.4 KiB
262 lines
7.4 KiB
/* $Id: tif_strip.c,v 1.1 2005-06-17 13:54:52 vp153 Exp $ */ |
|
|
|
/* |
|
* Copyright (c) 1991-1997 Sam Leffler |
|
* Copyright (c) 1991-1997 Silicon Graphics, Inc. |
|
* |
|
* Permission to use, copy, modify, distribute, and sell this software and |
|
* its documentation for any purpose is hereby granted without fee, provided |
|
* that (i) the above copyright notices and this permission notice appear in |
|
* all copies of the software and related documentation, and (ii) the names of |
|
* Sam Leffler and Silicon Graphics may not be used in any advertising or |
|
* publicity relating to the software without the specific, prior written |
|
* permission of Sam Leffler and Silicon Graphics. |
|
* |
|
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, |
|
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY |
|
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. |
|
* |
|
* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR |
|
* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, |
|
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, |
|
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF |
|
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
|
* OF THIS SOFTWARE. |
|
*/ |
|
|
|
/* |
|
* TIFF Library. |
|
* |
|
* Strip-organized Image Support Routines. |
|
*/ |
|
#include "tiffiop.h" |
|
|
|
static uint32 |
|
summarize(TIFF* tif, size_t summand1, size_t summand2, const char* where) |
|
{ |
|
/* |
|
* XXX: We are using casting to uint32 here, bacause sizeof(size_t) |
|
* may be larger than sizeof(uint32) on 64-bit architectures. |
|
*/ |
|
uint32 bytes = summand1 + summand2; |
|
|
|
if (bytes - summand1 != summand2) { |
|
TIFFError(tif->tif_name, "Integer overflow in %s", where); |
|
bytes = 0; |
|
} |
|
|
|
return (bytes); |
|
} |
|
|
|
static uint32 |
|
multiply(TIFF* tif, size_t nmemb, size_t elem_size, const char* where) |
|
{ |
|
uint32 bytes = nmemb * elem_size; |
|
|
|
if (elem_size && bytes / elem_size != nmemb) { |
|
TIFFError(tif->tif_name, "Integer overflow in %s", where); |
|
bytes = 0; |
|
} |
|
|
|
return (bytes); |
|
} |
|
|
|
/* |
|
* Compute which strip a (row,sample) value is in. |
|
*/ |
|
tstrip_t |
|
TIFFComputeStrip(TIFF* tif, uint32 row, tsample_t sample) |
|
{ |
|
TIFFDirectory *td = &tif->tif_dir; |
|
tstrip_t strip; |
|
|
|
strip = row / td->td_rowsperstrip; |
|
if (td->td_planarconfig == PLANARCONFIG_SEPARATE) { |
|
if (sample >= td->td_samplesperpixel) { |
|
TIFFError(tif->tif_name, |
|
"%lu: Sample out of range, max %lu", |
|
(unsigned long) sample, (unsigned long) td->td_samplesperpixel); |
|
return ((tstrip_t) 0); |
|
} |
|
strip += sample*td->td_stripsperimage; |
|
} |
|
return (strip); |
|
} |
|
|
|
/* |
|
* Compute how many strips are in an image. |
|
*/ |
|
tstrip_t |
|
TIFFNumberOfStrips(TIFF* tif) |
|
{ |
|
TIFFDirectory *td = &tif->tif_dir; |
|
tstrip_t nstrips; |
|
|
|
nstrips = (td->td_rowsperstrip == (uint32) -1 ? 1 : |
|
TIFFhowmany(td->td_imagelength, td->td_rowsperstrip)); |
|
if (td->td_planarconfig == PLANARCONFIG_SEPARATE) |
|
nstrips = multiply(tif, nstrips, td->td_samplesperpixel, |
|
"TIFFNumberOfStrips"); |
|
return (nstrips); |
|
} |
|
|
|
/* |
|
* Compute the # bytes in a variable height, row-aligned strip. |
|
*/ |
|
tsize_t |
|
TIFFVStripSize(TIFF* tif, uint32 nrows) |
|
{ |
|
TIFFDirectory *td = &tif->tif_dir; |
|
|
|
if (nrows == (uint32) -1) |
|
nrows = td->td_imagelength; |
|
if (td->td_planarconfig == PLANARCONFIG_CONTIG && |
|
td->td_photometric == PHOTOMETRIC_YCBCR && |
|
!isUpSampled(tif)) { |
|
/* |
|
* Packed YCbCr data contain one Cb+Cr for every |
|
* HorizontalSampling*VerticalSampling Y values. |
|
* Must also roundup width and height when calculating |
|
* since images that are not a multiple of the |
|
* horizontal/vertical subsampling area include |
|
* YCbCr data for the extended image. |
|
*/ |
|
uint16 ycbcrsubsampling[2]; |
|
tsize_t w, scanline, samplingarea; |
|
|
|
TIFFGetField( tif, TIFFTAG_YCBCRSUBSAMPLING, |
|
ycbcrsubsampling + 0, |
|
ycbcrsubsampling + 1 ); |
|
|
|
samplingarea = ycbcrsubsampling[0]*ycbcrsubsampling[1]; |
|
if (samplingarea == 0) { |
|
TIFFError(tif->tif_name, "Invalid YCbCr subsampling"); |
|
return 0; |
|
} |
|
|
|
w = TIFFroundup(td->td_imagewidth, ycbcrsubsampling[0]); |
|
scanline = TIFFhowmany8(multiply(tif, w, td->td_bitspersample, |
|
"TIFFVStripSize")); |
|
nrows = TIFFroundup(nrows, ycbcrsubsampling[1]); |
|
/* NB: don't need TIFFhowmany here 'cuz everything is rounded */ |
|
scanline = multiply(tif, nrows, scanline, "TIFFVStripSize"); |
|
return ((tsize_t) |
|
summarize(tif, scanline, |
|
multiply(tif, 2, scanline / samplingarea, |
|
"TIFFVStripSize"), "TIFFVStripSize")); |
|
} else |
|
return ((tsize_t) multiply(tif, nrows, TIFFScanlineSize(tif), |
|
"TIFFVStripSize")); |
|
} |
|
|
|
|
|
/* |
|
* Compute the # bytes in a raw strip. |
|
*/ |
|
tsize_t |
|
TIFFRawStripSize(TIFF* tif, tstrip_t strip) |
|
{ |
|
TIFFDirectory* td = &tif->tif_dir; |
|
tsize_t bytecount = td->td_stripbytecount[strip]; |
|
|
|
if (bytecount <= 0) { |
|
TIFFError(tif->tif_name, |
|
"%lu: Invalid strip byte count, strip %lu", |
|
(unsigned long) bytecount, (unsigned long) strip); |
|
bytecount = (tsize_t) -1; |
|
} |
|
|
|
return bytecount; |
|
} |
|
|
|
/* |
|
* Compute the # bytes in a (row-aligned) strip. |
|
* |
|
* Note that if RowsPerStrip is larger than the |
|
* recorded ImageLength, then the strip size is |
|
* truncated to reflect the actual space required |
|
* to hold the strip. |
|
*/ |
|
tsize_t |
|
TIFFStripSize(TIFF* tif) |
|
{ |
|
TIFFDirectory* td = &tif->tif_dir; |
|
uint32 rps = td->td_rowsperstrip; |
|
if (rps > td->td_imagelength) |
|
rps = td->td_imagelength; |
|
return (TIFFVStripSize(tif, rps)); |
|
} |
|
|
|
/* |
|
* Compute a default strip size based on the image |
|
* characteristics and a requested value. If the |
|
* request is <1 then we choose a strip size according |
|
* to certain heuristics. |
|
*/ |
|
uint32 |
|
TIFFDefaultStripSize(TIFF* tif, uint32 request) |
|
{ |
|
return (*tif->tif_defstripsize)(tif, request); |
|
} |
|
|
|
uint32 |
|
_TIFFDefaultStripSize(TIFF* tif, uint32 s) |
|
{ |
|
if ((int32) s < 1) { |
|
/* |
|
* If RowsPerStrip is unspecified, try to break the |
|
* image up into strips that are approximately 8Kbytes. |
|
*/ |
|
tsize_t scanline = TIFFScanlineSize(tif); |
|
s = (uint32)(8*1024) / (scanline == 0 ? 1 : scanline); |
|
if (s == 0) /* very wide images */ |
|
s = 1; |
|
} |
|
return (s); |
|
} |
|
|
|
/* |
|
* Return the number of bytes to read/write in a call to |
|
* one of the scanline-oriented i/o routines. Note that |
|
* this number may be 1/samples-per-pixel if data is |
|
* stored as separate planes. |
|
*/ |
|
tsize_t |
|
TIFFScanlineSize(TIFF* tif) |
|
{ |
|
TIFFDirectory *td = &tif->tif_dir; |
|
tsize_t scanline; |
|
|
|
scanline = multiply (tif, td->td_bitspersample, td->td_imagewidth, |
|
"TIFFScanlineSize"); |
|
if (td->td_planarconfig == PLANARCONFIG_CONTIG) |
|
scanline = multiply (tif, scanline, td->td_samplesperpixel, |
|
"TIFFScanlineSize"); |
|
return ((tsize_t) TIFFhowmany8(scanline)); |
|
} |
|
|
|
/* |
|
* Return the number of bytes required to store a complete |
|
* decoded and packed raster scanline (as opposed to the |
|
* I/O size returned by TIFFScanlineSize which may be less |
|
* if data is store as separate planes). |
|
*/ |
|
tsize_t |
|
TIFFRasterScanlineSize(TIFF* tif) |
|
{ |
|
TIFFDirectory *td = &tif->tif_dir; |
|
tsize_t scanline; |
|
|
|
scanline = multiply (tif, td->td_bitspersample, td->td_imagewidth, |
|
"TIFFRasterScanlineSize"); |
|
if (td->td_planarconfig == PLANARCONFIG_CONTIG) { |
|
scanline = multiply (tif, scanline, td->td_samplesperpixel, |
|
"TIFFRasterScanlineSize"); |
|
return ((tsize_t) TIFFhowmany8(scanline)); |
|
} else |
|
return ((tsize_t) multiply (tif, TIFFhowmany8(scanline), |
|
td->td_samplesperpixel, |
|
"TIFFRasterScanlineSize")); |
|
} |
|
|
|
/* vim: set ts=8 sts=8 sw=8 noet: */
|
|
|