/* Id */ /* * 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, because sizeof(size_t) * may be larger than sizeof(uint32) on 64-bit architectures. */ uint32 bytes = summand1 + summand2; if (bytes - summand1 != summand2) { TIFFErrorExt(tif->tif_clientdata, 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) { TIFFErrorExt(tif->tif_clientdata, 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) { TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "%lu: Col out of range, max %lu", (unsigned long) x, (unsigned long) (td->td_imagewidth - 1)); return (0); } if (y >= td->td_imagelength) { TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "%lu: Row out of range, max %lu", (unsigned long) y, (unsigned long) (td->td_imagelength - 1)); return (0); } if (z >= td->td_imagedepth) { TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "%lu: Depth out of range, max %lu", (unsigned long) z, (unsigned long) (td->td_imagedepth - 1)); return (0); } if (td->td_planarconfig == PLANARCONFIG_SEPARATE && s >= td->td_samplesperpixel) { TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "%lu: Sample out of range, max %lu", (unsigned long) s, (unsigned long) (td->td_samplesperpixel - 1)); return (0); } return (1); } /* * Compute how many tiles are in an image. */ ttile_t TEXPORT 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) { TIFFErrorExt(tif->tif_clientdata, 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 TEXPORT 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 TEXPORT 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: */