| /* $Id: tif_tile.c,v 1.27 2009/09/06 13:11:29 drolon 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, 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 |
| 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 |
| 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: */ |