--- /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