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call TIFFGetField() on YCBCRSUBSAMPLING for tif_jpeg hack

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This commit is contained in:
Frank Warmerdam 2002-07-31 21:05:57 +00:00
parent a0605bac6b
commit a6873099d0
2 changed files with 25 additions and 9 deletions
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15
libtiff/tif_print.c
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@ -1,4 +1,4 @@
/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_print.c,v 1.7 2002-03-27 06:31:29 warmerda Exp $ */
/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_print.c,v 1.8 2002-07-31 21:05:57 warmerda Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
@ -319,8 +319,19 @@ TIFFPrintDirectory(TIFF* tif, FILE* fd, long flags)
}
#ifdef YCBCR_SUPPORT
if (TIFFFieldSet(tif,FIELD_YCBCRSUBSAMPLING))
{
/*
* For hacky reasons (see tif_jpeg.c - JPEGFixupTestSubsampling),
* we need to fetch this rather than trust what is in our
* structures.
*/
uint16 subsampling[2];
TIFFGetField( tif, TIFFTAG_YCBCRSUBSAMPLING,
subsampling + 0, subsampling + 1 );
fprintf(fd, " YCbCr Subsampling: %u, %u\n",
td->td_ycbcrsubsampling[0], td->td_ycbcrsubsampling[1]);
subsampling[0], subsampling[1] );
}
if (TIFFFieldSet(tif,FIELD_YCBCRPOSITIONING)) {
fprintf(fd, " YCbCr Positioning: ");
switch (td->td_ycbcrpositioning) {

19
libtiff/tif_strip.c
View File

@ -1,4 +1,4 @@
/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_strip.c,v 1.1 1999-07-27 21:50:27 mike Exp $ */
/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_strip.c,v 1.2 2002-07-31 21:05:57 warmerda Exp $ */
/*
* Copyright (c) 1991-1997 Sam Leffler
@ -92,12 +92,17 @@ TIFFVStripSize(TIFF* tif, uint32 nrows)
* horizontal/vertical subsampling area include
* YCbCr data for the extended image.
*/
tsize_t w =
TIFFroundup(td->td_imagewidth, td->td_ycbcrsubsampling[0]);
tsize_t scanline = TIFFhowmany(w*td->td_bitspersample, 8);
tsize_t samplingarea =
td->td_ycbcrsubsampling[0]*td->td_ycbcrsubsampling[1];
nrows = TIFFroundup(nrows, td->td_ycbcrsubsampling[1]);
uint16 ycbcrsubsampling[2];
tsize_t w, scanline, samplingarea;
TIFFGetField( tif, TIFFTAG_YCBCRSUBSAMPLING,
ycbcrsubsampling + 0,
ycbcrsubsampling + 1 );
w = TIFFroundup(td->td_imagewidth, ycbcrsubsampling[0]);
scanline = TIFFhowmany(w*td->td_bitspersample, 8);
samplingarea = ycbcrsubsampling[0]*ycbcrsubsampling[1];
nrows = TIFFroundup(nrows, ycbcrsubsampling[1]);
/* NB: don't need TIFFhowmany here 'cuz everything is rounded */
return ((tsize_t)
(nrows*scanline + 2*(nrows*scanline / samplingarea)));