+++ /dev/null
-/* $Id: tif_tile.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.
- *
- * Tiled 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 tile an (x,y,z,s) value is in.
- */
-ttile_t
-TIFFComputeTile(TIFF* tif, uint32 x, uint32 y, uint32 z, tsample_t s)
-{
- TIFFDirectory *td = &tif->tif_dir;
- uint32 dx = td->td_tilewidth;
- uint32 dy = td->td_tilelength;
- uint32 dz = td->td_tiledepth;
- ttile_t tile = 1;
-
- if (td->td_imagedepth == 1)
- z = 0;
- if (dx == (uint32) -1)
- dx = td->td_imagewidth;
- if (dy == (uint32) -1)
- dy = td->td_imagelength;
- if (dz == (uint32) -1)
- dz = td->td_imagedepth;
- if (dx != 0 && dy != 0 && dz != 0) {
- uint32 xpt = TIFFhowmany(td->td_imagewidth, dx);
- uint32 ypt = TIFFhowmany(td->td_imagelength, dy);
- uint32 zpt = TIFFhowmany(td->td_imagedepth, dz);
-
- if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
- tile = (xpt*ypt*zpt)*s +
- (xpt*ypt)*(z/dz) +
- xpt*(y/dy) +
- x/dx;
- else
- tile = (xpt*ypt)*(z/dz) + xpt*(y/dy) + x/dx;
- }
- return (tile);
-}
-
-/*
- * Check an (x,y,z,s) coordinate
- * against the image bounds.
- */
-int
-TIFFCheckTile(TIFF* tif, uint32 x, uint32 y, uint32 z, tsample_t s)
-{
- TIFFDirectory *td = &tif->tif_dir;
-
- if (x >= td->td_imagewidth) {
- TIFFError(tif->tif_name, "%lu: Col out of range, max %lu",
- (unsigned long) x, (unsigned long) td->td_imagewidth);
- return (0);
- }
- if (y >= td->td_imagelength) {
- TIFFError(tif->tif_name, "%lu: Row out of range, max %lu",
- (unsigned long) y, (unsigned long) td->td_imagelength);
- return (0);
- }
- if (z >= td->td_imagedepth) {
- TIFFError(tif->tif_name, "%lu: Depth out of range, max %lu",
- (unsigned long) z, (unsigned long) td->td_imagedepth);
- return (0);
- }
- if (td->td_planarconfig == PLANARCONFIG_SEPARATE &&
- s >= td->td_samplesperpixel) {
- TIFFError(tif->tif_name, "%lu: Sample out of range, max %lu",
- (unsigned long) s, (unsigned long) td->td_samplesperpixel);
- return (0);
- }
- return (1);
-}
-
-/*
- * Compute how many tiles are in an image.
- */
-ttile_t
-TIFFNumberOfTiles(TIFF* tif)
-{
- TIFFDirectory *td = &tif->tif_dir;
- uint32 dx = td->td_tilewidth;
- uint32 dy = td->td_tilelength;
- uint32 dz = td->td_tiledepth;
- ttile_t ntiles;
-
- if (dx == (uint32) -1)
- dx = td->td_imagewidth;
- if (dy == (uint32) -1)
- dy = td->td_imagelength;
- if (dz == (uint32) -1)
- dz = td->td_imagedepth;
- ntiles = (dx == 0 || dy == 0 || dz == 0) ? 0 :
- multiply(tif, multiply(tif, TIFFhowmany(td->td_imagewidth, dx),
- TIFFhowmany(td->td_imagelength, dy),
- "TIFFNumberOfTiles"),
- TIFFhowmany(td->td_imagedepth, dz), "TIFFNumberOfTiles");
- if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
- ntiles = multiply(tif, ntiles, td->td_samplesperpixel,
- "TIFFNumberOfTiles");
- return (ntiles);
-}
-
-/*
- * Compute the # bytes in each row of a tile.
- */
-tsize_t
-TIFFTileRowSize(TIFF* tif)
-{
- TIFFDirectory *td = &tif->tif_dir;
- tsize_t rowsize;
-
- if (td->td_tilelength == 0 || td->td_tilewidth == 0)
- return ((tsize_t) 0);
- rowsize = multiply(tif, td->td_bitspersample, td->td_tilewidth,
- "TIFFTileRowSize");
- if (td->td_planarconfig == PLANARCONFIG_CONTIG)
- rowsize = multiply(tif, rowsize, td->td_samplesperpixel,
- "TIFFTileRowSize");
- return ((tsize_t) TIFFhowmany8(rowsize));
-}
-
-/*
- * Compute the # bytes in a variable length, row-aligned tile.
- */
-tsize_t
-TIFFVTileSize(TIFF* tif, uint32 nrows)
-{
- TIFFDirectory *td = &tif->tif_dir;
- tsize_t tilesize;
-
- if (td->td_tilelength == 0 || td->td_tilewidth == 0 ||
- td->td_tiledepth == 0)
- return ((tsize_t) 0);
- 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.
- */
- tsize_t w =
- TIFFroundup(td->td_tilewidth, td->td_ycbcrsubsampling[0]);
- tsize_t rowsize =
- TIFFhowmany8(multiply(tif, w, td->td_bitspersample,
- "TIFFVTileSize"));
- tsize_t samplingarea =
- td->td_ycbcrsubsampling[0]*td->td_ycbcrsubsampling[1];
- if (samplingarea == 0) {
- TIFFError(tif->tif_name, "Invalid YCbCr subsampling");
- return 0;
- }
- nrows = TIFFroundup(nrows, td->td_ycbcrsubsampling[1]);
- /* NB: don't need TIFFhowmany here 'cuz everything is rounded */
- tilesize = multiply(tif, nrows, rowsize, "TIFFVTileSize");
- tilesize = summarize(tif, tilesize,
- multiply(tif, 2, tilesize / samplingarea,
- "TIFFVTileSize"),
- "TIFFVTileSize");
- } else
- tilesize = multiply(tif, nrows, TIFFTileRowSize(tif),
- "TIFFVTileSize");
- return ((tsize_t)
- multiply(tif, tilesize, td->td_tiledepth, "TIFFVTileSize"));
-}
-
-/*
- * Compute the # bytes in a row-aligned tile.
- */
-tsize_t
-TIFFTileSize(TIFF* tif)
-{
- return (TIFFVTileSize(tif, tif->tif_dir.td_tilelength));
-}
-
-/*
- * Compute a default tile size based on the image
- * characteristics and a requested value. If a
- * request is <1 then we choose a size according
- * to certain heuristics.
- */
-void
-TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)
-{
- (*tif->tif_deftilesize)(tif, tw, th);
-}
-
-void
-_TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)
-{
- (void) tif;
- if (*(int32*) tw < 1)
- *tw = 256;
- if (*(int32*) th < 1)
- *th = 256;
- /* roundup to a multiple of 16 per the spec */
- if (*tw & 0xf)
- *tw = TIFFroundup(*tw, 16);
- if (*th & 0xf)
- *th = TIFFroundup(*th, 16);
-}
-
-/* vim: set ts=8 sts=8 sw=8 noet: */
projects / opencv / blobdiff