diff options
Diffstat (limited to 'src/libtiff/tif_strip.c')
| -rw-r--r-- | src/libtiff/tif_strip.c | 85 |
1 files changed, 77 insertions, 8 deletions
diff --git a/src/libtiff/tif_strip.c b/src/libtiff/tif_strip.c index e6a0fb7..9eaa98e 100644 --- a/src/libtiff/tif_strip.c +++ b/src/libtiff/tif_strip.c @@ -1,4 +1,4 @@ -/* $Id: tif_strip.c,v 1.1 2008/10/17 06:16:07 scuri Exp $ */ +/* $Id: tif_strip.c,v 1.2 2009/08/21 04:01:59 scuri Exp $ */ /* * Copyright (c) 1991-1997 Sam Leffler @@ -121,12 +121,12 @@ TIFFVStripSize(TIFF* tif, uint32 nrows) * horizontal/vertical subsampling area include * YCbCr data for the extended image. */ - uint16 ycbcrsubsampling[2]; - tsize_t w, scanline, samplingarea; + uint16 ycbcrsubsampling[2]; + tsize_t w, scanline, samplingarea; - TIFFGetField( tif, TIFFTAG_YCBCRSUBSAMPLING, - ycbcrsubsampling + 0, - ycbcrsubsampling + 1 ); + TIFFGetField( tif, TIFFTAG_YCBCRSUBSAMPLING, + ycbcrsubsampling + 0, + ycbcrsubsampling + 1 ); samplingarea = ycbcrsubsampling[0]*ycbcrsubsampling[1]; if (samplingarea == 0) { @@ -228,13 +228,13 @@ TIFFScanlineSize(TIFF* tif) { TIFFDirectory *td = &tif->tif_dir; tsize_t scanline; - + if (td->td_planarconfig == PLANARCONFIG_CONTIG) { if (td->td_photometric == PHOTOMETRIC_YCBCR && !isUpSampled(tif)) { uint16 ycbcrsubsampling[2]; - TIFFGetField(tif, TIFFTAG_YCBCRSUBSAMPLING, + TIFFGetField(tif, TIFFTAG_YCBCRSUBSAMPLING, ycbcrsubsampling + 0, ycbcrsubsampling + 1); @@ -268,6 +268,75 @@ TIFFScanlineSize(TIFF* tif) } /* + * Some stuff depends on this older version of TIFFScanlineSize + * TODO: resolve this + */ +tsize_t +TIFFOldScanlineSize(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 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. + * The ScanlineSize in case of YCbCrSubsampling is defined as the + * strip size divided by the strip height, i.e. the size of a pack of vertical + * subsampling lines divided by vertical subsampling. It should thus make + * sense when multiplied by a multiple of vertical subsampling. + * Some stuff depends on this newer version of TIFFScanlineSize + * TODO: resolve this + */ +tsize_t +TIFFNewScanlineSize(TIFF* tif) +{ + TIFFDirectory *td = &tif->tif_dir; + tsize_t scanline; + + if (td->td_planarconfig == PLANARCONFIG_CONTIG) { + if (td->td_photometric == PHOTOMETRIC_YCBCR + && !isUpSampled(tif)) { + uint16 ycbcrsubsampling[2]; + + TIFFGetField(tif, TIFFTAG_YCBCRSUBSAMPLING, + ycbcrsubsampling + 0, + ycbcrsubsampling + 1); + + if (ycbcrsubsampling[0]*ycbcrsubsampling[1] == 0) { + TIFFErrorExt(tif->tif_clientdata, tif->tif_name, + "Invalid YCbCr subsampling"); + return 0; + } + + return((tsize_t) ((((td->td_imagewidth+ycbcrsubsampling[0]-1) + /ycbcrsubsampling[0]) + *(ycbcrsubsampling[0]*ycbcrsubsampling[1]+2) + *td->td_bitspersample+7) + /8)/ycbcrsubsampling[1]); + + } else { + scanline = multiply(tif, td->td_imagewidth, + td->td_samplesperpixel, + "TIFFScanlineSize"); + } + } else + scanline = td->td_imagewidth; + return ((tsize_t) TIFFhowmany8(multiply(tif, scanline, + td->td_bitspersample, + "TIFFScanlineSize"))); +} + +/* * 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 |