forked from KolibriOS/kolibrios
866 lines
21 KiB
C
866 lines
21 KiB
C
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#include "fitz.h"
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#include "muxps.h"
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/*
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* TIFF image loader. Should be enough to support TIFF files in XPS.
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* Baseline TIFF 6.0 plus CMYK, LZW, Flate and JPEG support.
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* Limited bit depths (1,2,4,8).
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* Limited planar configurations (1=chunky).
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* No tiles (easy fix if necessary).
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* TODO: RGBPal images
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*/
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struct tiff
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{
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/* "file" */
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byte *bp, *rp, *ep;
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/* byte order */
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unsigned order;
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/* where we can find the strips of image data */
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unsigned rowsperstrip;
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unsigned *stripoffsets;
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unsigned *stripbytecounts;
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/* colormap */
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unsigned *colormap;
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/* assorted tags */
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unsigned subfiletype;
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unsigned photometric;
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unsigned compression;
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unsigned imagewidth;
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unsigned imagelength;
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unsigned samplesperpixel;
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unsigned bitspersample;
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unsigned planar;
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unsigned extrasamples;
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unsigned xresolution;
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unsigned yresolution;
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unsigned resolutionunit;
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unsigned fillorder;
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unsigned g3opts;
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unsigned g4opts;
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unsigned predictor;
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unsigned ycbcrsubsamp[2];
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byte *jpegtables; /* point into "file" buffer */
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unsigned jpegtableslen;
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byte *profile;
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int profilesize;
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/* decoded data */
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fz_colorspace *colorspace;
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byte *samples;
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int stride;
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};
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enum
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{
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TII = 0x4949, /* 'II' */
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TMM = 0x4d4d, /* 'MM' */
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TBYTE = 1,
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TASCII = 2,
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TSHORT = 3,
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TLONG = 4,
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TRATIONAL = 5
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};
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#define NewSubfileType 254
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#define ImageWidth 256
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#define ImageLength 257
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#define BitsPerSample 258
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#define Compression 259
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#define PhotometricInterpretation 262
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#define FillOrder 266
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#define StripOffsets 273
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#define SamplesPerPixel 277
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#define RowsPerStrip 278
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#define StripByteCounts 279
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#define XResolution 282
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#define YResolution 283
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#define PlanarConfiguration 284
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#define T4Options 292
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#define T6Options 293
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#define ResolutionUnit 296
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#define Predictor 317
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#define ColorMap 320
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#define TileWidth 322
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#define TileLength 323
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#define TileOffsets 324
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#define TileByteCounts 325
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#define ExtraSamples 338
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#define JPEGTables 347
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#define YCbCrSubSampling 520
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#define ICCProfile 34675
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static const byte bitrev[256] =
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{
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0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
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0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
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0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
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0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
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0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
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0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
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0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
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0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
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0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
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0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
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0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
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0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
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0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
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0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
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0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
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0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
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0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
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0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
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0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
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0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
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0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
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0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
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0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
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0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
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0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
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0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
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0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
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0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
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0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
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0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
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0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
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0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
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};
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static int
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xps_decode_tiff_uncompressed(struct tiff *tiff, fz_stream *stm, byte *wp, int wlen)
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{
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int n = fz_read(stm, wp, wlen);
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fz_close(stm);
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if (n < 0)
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return fz_rethrow(n, "cannot read uncompressed strip");
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return fz_okay;
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}
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static int
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xps_decode_tiff_packbits(struct tiff *tiff, fz_stream *chain, byte *wp, int wlen)
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{
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fz_stream *stm = fz_open_rld(chain);
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int n = fz_read(stm, wp, wlen);
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fz_close(stm);
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if (n < 0)
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return fz_rethrow(n, "cannot read packbits strip");
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return fz_okay;
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}
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static int
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xps_decode_tiff_lzw(struct tiff *tiff, fz_stream *chain, byte *wp, int wlen)
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{
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fz_stream *stm = fz_open_lzwd(chain, NULL);
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int n = fz_read(stm, wp, wlen);
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fz_close(stm);
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if (n < 0)
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return fz_rethrow(n, "cannot read lzw strip");
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return fz_okay;
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}
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static int
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xps_decode_tiff_flate(struct tiff *tiff, fz_stream *chain, byte *wp, int wlen)
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{
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fz_stream *stm = fz_open_flated(chain);
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int n = fz_read(stm, wp, wlen);
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fz_close(stm);
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if (n < 0)
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return fz_rethrow(n, "cannot read flate strip");
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return fz_okay;
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}
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static int
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xps_decode_tiff_fax(struct tiff *tiff, int comp, fz_stream *chain, byte *wp, int wlen)
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{
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fz_stream *stm;
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fz_obj *params;
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fz_obj *columns, *rows, *black_is_1, *k, *encoded_byte_align;
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int n;
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columns = fz_new_int(tiff->imagewidth);
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rows = fz_new_int(tiff->imagelength);
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black_is_1 = fz_new_bool(tiff->photometric == 0);
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k = fz_new_int(comp == 4 ? -1 : 0);
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encoded_byte_align = fz_new_bool(comp == 2);
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params = fz_new_dict(5);
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fz_dict_puts(params, "Columns", columns);
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fz_dict_puts(params, "Rows", rows);
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fz_dict_puts(params, "BlackIs1", black_is_1);
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fz_dict_puts(params, "K", k);
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fz_dict_puts(params, "EncodedByteAlign", encoded_byte_align);
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fz_drop_obj(columns);
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fz_drop_obj(rows);
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fz_drop_obj(black_is_1);
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fz_drop_obj(k);
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fz_drop_obj(encoded_byte_align);
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stm = fz_open_faxd(chain, params);
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n = fz_read(stm, wp, wlen);
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fz_close(stm);
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fz_drop_obj(params);
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if (n < 0)
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return fz_rethrow(n, "cannot read fax strip");
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return fz_okay;
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}
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static int
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xps_decode_tiff_jpeg(struct tiff *tiff, fz_stream *chain, byte *wp, int wlen)
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{
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fz_stream *stm = fz_open_dctd(chain, NULL);
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int n = fz_read(stm, wp, wlen);
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fz_close(stm);
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if (n < 0)
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return fz_rethrow(n, "cannot read jpeg strip");
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return fz_okay;
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}
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static inline int getcomp(byte *line, int x, int bpc)
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{
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switch (bpc)
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{
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case 1: return (line[x >> 3] >> ( 7 - (x & 7) ) ) & 1;
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case 2: return (line[x >> 2] >> ( ( 3 - (x & 3) ) << 1 ) ) & 3;
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case 4: return (line[x >> 1] >> ( ( 1 - (x & 1) ) << 2 ) ) & 15;
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case 8: return line[x];
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case 16: return line[x << 1] << 8 | line[(x << 1) + 1];
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}
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return 0;
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}
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static inline void putcomp(byte *line, int x, int bpc, int value)
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{
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int maxval = (1 << bpc) - 1;
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switch (bpc)
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{
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case 1: line[x >> 3] &= ~(maxval << (7 - (x & 7))); break;
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case 2: line[x >> 2] &= ~(maxval << ((3 - (x & 3)) << 1)); break;
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case 4: line[x >> 1] &= ~(maxval << ((1 - (x & 1)) << 2)); break;
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}
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switch (bpc)
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{
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case 1: line[x >> 3] |= value << (7 - (x & 7)); break;
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case 2: line[x >> 2] |= value << ((3 - (x & 3)) << 1); break;
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case 4: line[x >> 1] |= value << ((1 - (x & 1)) << 2); break;
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case 8: line[x] = value; break;
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case 16: line[x << 1] = value >> 8; line[(x << 1) + 1] = value & 0xFF; break;
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}
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}
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static void
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xps_unpredict_tiff(byte *line, int width, int comps, int bits)
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{
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byte left[32];
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int i, k, v;
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for (k = 0; k < comps; k++)
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left[k] = 0;
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for (i = 0; i < width; i++)
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{
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for (k = 0; k < comps; k++)
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{
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v = getcomp(line, i * comps + k, bits);
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v = v + left[k];
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v = v % (1 << bits);
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putcomp(line, i * comps + k, bits, v);
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left[k] = v;
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}
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}
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}
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static void
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xps_invert_tiff(byte *line, int width, int comps, int bits, int alpha)
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{
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int i, k, v;
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int m = (1 << bits) - 1;
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for (i = 0; i < width; i++)
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{
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for (k = 0; k < comps; k++)
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{
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v = getcomp(line, i * comps + k, bits);
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if (!alpha || k < comps - 1)
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v = m - v;
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putcomp(line, i * comps + k, bits, v);
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}
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}
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}
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static int
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xps_expand_tiff_colormap(struct tiff *tiff)
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{
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int maxval = 1 << tiff->bitspersample;
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byte *samples;
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byte *src, *dst;
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unsigned int x, y;
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unsigned int stride;
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/* colormap has first all red, then all green, then all blue values */
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/* colormap values are 0..65535, bits is 4 or 8 */
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/* image can be with or without extrasamples: comps is 1 or 2 */
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if (tiff->samplesperpixel != 1 && tiff->samplesperpixel != 2)
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return fz_throw("invalid number of samples for RGBPal");
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if (tiff->bitspersample != 4 && tiff->bitspersample != 8)
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return fz_throw("invalid number of bits for RGBPal");
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stride = tiff->imagewidth * (tiff->samplesperpixel + 2);
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samples = fz_malloc(stride * tiff->imagelength);
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for (y = 0; y < tiff->imagelength; y++)
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{
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src = tiff->samples + (tiff->stride * y);
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dst = samples + (stride * y);
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for (x = 0; x < tiff->imagewidth; x++)
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{
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if (tiff->extrasamples)
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{
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int c = getcomp(src, x * 2, tiff->bitspersample);
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int a = getcomp(src, x * 2 + 1, tiff->bitspersample);
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*dst++ = tiff->colormap[c + 0] >> 8;
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|
|
*dst++ = tiff->colormap[c + maxval] >> 8;
|
||
|
|
*dst++ = tiff->colormap[c + maxval * 2] >> 8;
|
||
|
|
*dst++ = a << (8 - tiff->bitspersample);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
int c = getcomp(src, x, tiff->bitspersample);
|
||
|
|
*dst++ = tiff->colormap[c + 0] >> 8;
|
||
|
|
*dst++ = tiff->colormap[c + maxval] >> 8;
|
||
|
|
*dst++ = tiff->colormap[c + maxval * 2] >> 8;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
tiff->samplesperpixel += 2;
|
||
|
|
tiff->bitspersample = 8;
|
||
|
|
tiff->stride = stride;
|
||
|
|
tiff->samples = samples;
|
||
|
|
return fz_okay;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
xps_decode_tiff_strips(struct tiff *tiff)
|
||
|
|
{
|
||
|
|
fz_stream *stm;
|
||
|
|
int error;
|
||
|
|
|
||
|
|
/* switch on compression to create a filter */
|
||
|
|
/* feed each strip to the filter */
|
||
|
|
/* read out the data and pack the samples into an xps_image */
|
||
|
|
|
||
|
|
/* type 32773 / packbits -- nothing special (same row-padding as PDF) */
|
||
|
|
/* type 2 / ccitt rle -- no EOL, no RTC, rows are byte-aligned */
|
||
|
|
/* type 3 and 4 / g3 and g4 -- each strip starts new section */
|
||
|
|
/* type 5 / lzw -- each strip is handled separately */
|
||
|
|
|
||
|
|
byte *wp;
|
||
|
|
unsigned row;
|
||
|
|
unsigned strip;
|
||
|
|
unsigned i;
|
||
|
|
|
||
|
|
if (!tiff->rowsperstrip || !tiff->stripoffsets || !tiff->rowsperstrip)
|
||
|
|
return fz_throw("no image data in tiff; maybe it is tiled");
|
||
|
|
|
||
|
|
if (tiff->planar != 1)
|
||
|
|
return fz_throw("image data is not in chunky format");
|
||
|
|
|
||
|
|
tiff->stride = (tiff->imagewidth * tiff->samplesperpixel * tiff->bitspersample + 7) / 8;
|
||
|
|
|
||
|
|
switch (tiff->photometric)
|
||
|
|
{
|
||
|
|
case 0: /* WhiteIsZero -- inverted */
|
||
|
|
tiff->colorspace = fz_device_gray;
|
||
|
|
break;
|
||
|
|
case 1: /* BlackIsZero */
|
||
|
|
tiff->colorspace = fz_device_gray;
|
||
|
|
break;
|
||
|
|
case 2: /* RGB */
|
||
|
|
tiff->colorspace = fz_device_rgb;
|
||
|
|
break;
|
||
|
|
case 3: /* RGBPal */
|
||
|
|
tiff->colorspace = fz_device_rgb;
|
||
|
|
break;
|
||
|
|
case 5: /* CMYK */
|
||
|
|
tiff->colorspace = fz_device_cmyk;
|
||
|
|
break;
|
||
|
|
case 6: /* YCbCr */
|
||
|
|
/* it's probably a jpeg ... we let jpeg convert to rgb */
|
||
|
|
tiff->colorspace = fz_device_rgb;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return fz_throw("unknown photometric: %d", tiff->photometric);
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (tiff->resolutionunit)
|
||
|
|
{
|
||
|
|
case 2:
|
||
|
|
/* no unit conversion needed */
|
||
|
|
break;
|
||
|
|
case 3:
|
||
|
|
tiff->xresolution = tiff->xresolution * 254 / 100;
|
||
|
|
tiff->yresolution = tiff->yresolution * 254 / 100;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
tiff->xresolution = 96;
|
||
|
|
tiff->yresolution = 96;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Note xres and yres could be 0 even if unit was set. If so default to 96dpi. */
|
||
|
|
if (tiff->xresolution == 0 || tiff->yresolution == 0)
|
||
|
|
{
|
||
|
|
tiff->xresolution = 96;
|
||
|
|
tiff->yresolution = 96;
|
||
|
|
}
|
||
|
|
|
||
|
|
tiff->samples = fz_calloc(tiff->imagelength, tiff->stride);
|
||
|
|
memset(tiff->samples, 0x55, tiff->imagelength * tiff->stride);
|
||
|
|
wp = tiff->samples;
|
||
|
|
|
||
|
|
strip = 0;
|
||
|
|
for (row = 0; row < tiff->imagelength; row += tiff->rowsperstrip)
|
||
|
|
{
|
||
|
|
unsigned offset = tiff->stripoffsets[strip];
|
||
|
|
unsigned rlen = tiff->stripbytecounts[strip];
|
||
|
|
unsigned wlen = tiff->stride * tiff->rowsperstrip;
|
||
|
|
byte *rp = tiff->bp + offset;
|
||
|
|
|
||
|
|
if (wp + wlen > tiff->samples + tiff->stride * tiff->imagelength)
|
||
|
|
wlen = tiff->samples + tiff->stride * tiff->imagelength - wp;
|
||
|
|
|
||
|
|
if (rp + rlen > tiff->ep)
|
||
|
|
return fz_throw("strip extends beyond the end of the file");
|
||
|
|
|
||
|
|
/* the bits are in un-natural order */
|
||
|
|
if (tiff->fillorder == 2)
|
||
|
|
for (i = 0; i < rlen; i++)
|
||
|
|
rp[i] = bitrev[rp[i]];
|
||
|
|
|
||
|
|
/* the strip decoders will close this */
|
||
|
|
stm = fz_open_memory(rp, rlen);
|
||
|
|
|
||
|
|
switch (tiff->compression)
|
||
|
|
{
|
||
|
|
case 1:
|
||
|
|
error = xps_decode_tiff_uncompressed(tiff, stm, wp, wlen);
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
error = xps_decode_tiff_fax(tiff, 2, stm, wp, wlen);
|
||
|
|
break;
|
||
|
|
case 3:
|
||
|
|
error = xps_decode_tiff_fax(tiff, 3, stm, wp, wlen);
|
||
|
|
break;
|
||
|
|
case 4:
|
||
|
|
error = xps_decode_tiff_fax(tiff, 4, stm, wp, wlen);
|
||
|
|
break;
|
||
|
|
case 5:
|
||
|
|
error = xps_decode_tiff_lzw(tiff, stm, wp, wlen);
|
||
|
|
break;
|
||
|
|
case 6:
|
||
|
|
error = fz_throw("deprecated JPEG in TIFF compression not supported");
|
||
|
|
break;
|
||
|
|
case 7:
|
||
|
|
error = xps_decode_tiff_jpeg(tiff, stm, wp, wlen);
|
||
|
|
break;
|
||
|
|
case 8:
|
||
|
|
error = xps_decode_tiff_flate(tiff, stm, wp, wlen);
|
||
|
|
break;
|
||
|
|
case 32773:
|
||
|
|
error = xps_decode_tiff_packbits(tiff, stm, wp, wlen);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
error = fz_throw("unknown TIFF compression: %d", tiff->compression);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (error)
|
||
|
|
return fz_rethrow(error, "cannot decode strip %d", row / tiff->rowsperstrip);
|
||
|
|
|
||
|
|
/* scramble the bits back into original order */
|
||
|
|
if (tiff->fillorder == 2)
|
||
|
|
for (i = 0; i < rlen; i++)
|
||
|
|
rp[i] = bitrev[rp[i]];
|
||
|
|
|
||
|
|
wp += tiff->stride * tiff->rowsperstrip;
|
||
|
|
strip ++;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Predictor (only for LZW and Flate) */
|
||
|
|
if ((tiff->compression == 5 || tiff->compression == 8) && tiff->predictor == 2)
|
||
|
|
{
|
||
|
|
byte *p = tiff->samples;
|
||
|
|
for (i = 0; i < tiff->imagelength; i++)
|
||
|
|
{
|
||
|
|
xps_unpredict_tiff(p, tiff->imagewidth, tiff->samplesperpixel, tiff->bitspersample);
|
||
|
|
p += tiff->stride;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* RGBPal */
|
||
|
|
if (tiff->photometric == 3 && tiff->colormap)
|
||
|
|
{
|
||
|
|
error = xps_expand_tiff_colormap(tiff);
|
||
|
|
if (error)
|
||
|
|
return fz_rethrow(error, "cannot expand colormap");
|
||
|
|
}
|
||
|
|
|
||
|
|
/* WhiteIsZero .. invert */
|
||
|
|
if (tiff->photometric == 0)
|
||
|
|
{
|
||
|
|
byte *p = tiff->samples;
|
||
|
|
for (i = 0; i < tiff->imagelength; i++)
|
||
|
|
{
|
||
|
|
xps_invert_tiff(p, tiff->imagewidth, tiff->samplesperpixel, tiff->bitspersample, tiff->extrasamples);
|
||
|
|
p += tiff->stride;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return fz_okay;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int readbyte(struct tiff *tiff)
|
||
|
|
{
|
||
|
|
if (tiff->rp < tiff->ep)
|
||
|
|
return *tiff->rp++;
|
||
|
|
return EOF;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline unsigned readshort(struct tiff *tiff)
|
||
|
|
{
|
||
|
|
unsigned a = readbyte(tiff);
|
||
|
|
unsigned b = readbyte(tiff);
|
||
|
|
if (tiff->order == TII)
|
||
|
|
return (b << 8) | a;
|
||
|
|
return (a << 8) | b;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline unsigned readlong(struct tiff *tiff)
|
||
|
|
{
|
||
|
|
unsigned a = readbyte(tiff);
|
||
|
|
unsigned b = readbyte(tiff);
|
||
|
|
unsigned c = readbyte(tiff);
|
||
|
|
unsigned d = readbyte(tiff);
|
||
|
|
if (tiff->order == TII)
|
||
|
|
return (d << 24) | (c << 16) | (b << 8) | a;
|
||
|
|
return (a << 24) | (b << 16) | (c << 8) | d;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
xps_read_tiff_bytes(unsigned char *p, struct tiff *tiff, unsigned ofs, unsigned n)
|
||
|
|
{
|
||
|
|
tiff->rp = tiff->bp + ofs;
|
||
|
|
if (tiff->rp > tiff->ep)
|
||
|
|
tiff->rp = tiff->bp;
|
||
|
|
|
||
|
|
while (n--)
|
||
|
|
*p++ = readbyte(tiff);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
xps_read_tiff_tag_value(unsigned *p, struct tiff *tiff, unsigned type, unsigned ofs, unsigned n)
|
||
|
|
{
|
||
|
|
tiff->rp = tiff->bp + ofs;
|
||
|
|
if (tiff->rp > tiff->ep)
|
||
|
|
tiff->rp = tiff->bp;
|
||
|
|
|
||
|
|
while (n--)
|
||
|
|
{
|
||
|
|
switch (type)
|
||
|
|
{
|
||
|
|
case TRATIONAL:
|
||
|
|
*p = readlong(tiff);
|
||
|
|
*p = *p / readlong(tiff);
|
||
|
|
p ++;
|
||
|
|
break;
|
||
|
|
case TBYTE: *p++ = readbyte(tiff); break;
|
||
|
|
case TSHORT: *p++ = readshort(tiff); break;
|
||
|
|
case TLONG: *p++ = readlong(tiff); break;
|
||
|
|
default: *p++ = 0; break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
xps_read_tiff_tag(struct tiff *tiff, unsigned offset)
|
||
|
|
{
|
||
|
|
unsigned tag;
|
||
|
|
unsigned type;
|
||
|
|
unsigned count;
|
||
|
|
unsigned value;
|
||
|
|
|
||
|
|
tiff->rp = tiff->bp + offset;
|
||
|
|
|
||
|
|
tag = readshort(tiff);
|
||
|
|
type = readshort(tiff);
|
||
|
|
count = readlong(tiff);
|
||
|
|
|
||
|
|
if ((type == TBYTE && count <= 4) ||
|
||
|
|
(type == TSHORT && count <= 2) ||
|
||
|
|
(type == TLONG && count <= 1))
|
||
|
|
value = tiff->rp - tiff->bp;
|
||
|
|
else
|
||
|
|
value = readlong(tiff);
|
||
|
|
|
||
|
|
switch (tag)
|
||
|
|
{
|
||
|
|
case NewSubfileType:
|
||
|
|
xps_read_tiff_tag_value(&tiff->subfiletype, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case ImageWidth:
|
||
|
|
xps_read_tiff_tag_value(&tiff->imagewidth, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case ImageLength:
|
||
|
|
xps_read_tiff_tag_value(&tiff->imagelength, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case BitsPerSample:
|
||
|
|
xps_read_tiff_tag_value(&tiff->bitspersample, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case Compression:
|
||
|
|
xps_read_tiff_tag_value(&tiff->compression, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case PhotometricInterpretation:
|
||
|
|
xps_read_tiff_tag_value(&tiff->photometric, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case FillOrder:
|
||
|
|
xps_read_tiff_tag_value(&tiff->fillorder, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case SamplesPerPixel:
|
||
|
|
xps_read_tiff_tag_value(&tiff->samplesperpixel, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case RowsPerStrip:
|
||
|
|
xps_read_tiff_tag_value(&tiff->rowsperstrip, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case XResolution:
|
||
|
|
xps_read_tiff_tag_value(&tiff->xresolution, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case YResolution:
|
||
|
|
xps_read_tiff_tag_value(&tiff->yresolution, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case PlanarConfiguration:
|
||
|
|
xps_read_tiff_tag_value(&tiff->planar, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case T4Options:
|
||
|
|
xps_read_tiff_tag_value(&tiff->g3opts, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case T6Options:
|
||
|
|
xps_read_tiff_tag_value(&tiff->g4opts, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case Predictor:
|
||
|
|
xps_read_tiff_tag_value(&tiff->predictor, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case ResolutionUnit:
|
||
|
|
xps_read_tiff_tag_value(&tiff->resolutionunit, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
case YCbCrSubSampling:
|
||
|
|
xps_read_tiff_tag_value(tiff->ycbcrsubsamp, tiff, type, value, 2);
|
||
|
|
break;
|
||
|
|
case ExtraSamples:
|
||
|
|
xps_read_tiff_tag_value(&tiff->extrasamples, tiff, type, value, 1);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case ICCProfile:
|
||
|
|
tiff->profile = fz_malloc(count);
|
||
|
|
/* ICC profile data type is set to UNDEFINED.
|
||
|
|
* TBYTE reading not correct in xps_read_tiff_tag_value */
|
||
|
|
xps_read_tiff_bytes(tiff->profile, tiff, value, count);
|
||
|
|
tiff->profilesize = count;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case JPEGTables:
|
||
|
|
fz_warn("jpeg tables in tiff not implemented");
|
||
|
|
tiff->jpegtables = tiff->bp + value;
|
||
|
|
tiff->jpegtableslen = count;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case StripOffsets:
|
||
|
|
tiff->stripoffsets = fz_calloc(count, sizeof(unsigned));
|
||
|
|
xps_read_tiff_tag_value(tiff->stripoffsets, tiff, type, value, count);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case StripByteCounts:
|
||
|
|
tiff->stripbytecounts = fz_calloc(count, sizeof(unsigned));
|
||
|
|
xps_read_tiff_tag_value(tiff->stripbytecounts, tiff, type, value, count);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case ColorMap:
|
||
|
|
tiff->colormap = fz_calloc(count, sizeof(unsigned));
|
||
|
|
xps_read_tiff_tag_value(tiff->colormap, tiff, type, value, count);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case TileWidth:
|
||
|
|
case TileLength:
|
||
|
|
case TileOffsets:
|
||
|
|
case TileByteCounts:
|
||
|
|
return fz_throw("tiled tiffs not supported");
|
||
|
|
|
||
|
|
default:
|
||
|
|
/* printf("unknown tag: %d t=%d n=%d\n", tag, type, count); */
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return fz_okay;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
xps_swap_byte_order(byte *buf, int n)
|
||
|
|
{
|
||
|
|
int i, t;
|
||
|
|
for (i = 0; i < n; i++)
|
||
|
|
{
|
||
|
|
t = buf[i * 2 + 0];
|
||
|
|
buf[i * 2 + 0] = buf[i * 2 + 1];
|
||
|
|
buf[i * 2 + 1] = t;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
xps_decode_tiff_header(struct tiff *tiff, byte *buf, int len)
|
||
|
|
{
|
||
|
|
unsigned version;
|
||
|
|
unsigned offset;
|
||
|
|
unsigned count;
|
||
|
|
unsigned i;
|
||
|
|
int error;
|
||
|
|
|
||
|
|
memset(tiff, 0, sizeof(struct tiff));
|
||
|
|
|
||
|
|
tiff->bp = buf;
|
||
|
|
tiff->rp = buf;
|
||
|
|
tiff->ep = buf + len;
|
||
|
|
|
||
|
|
/* tag defaults, where applicable */
|
||
|
|
tiff->bitspersample = 1;
|
||
|
|
tiff->compression = 1;
|
||
|
|
tiff->samplesperpixel = 1;
|
||
|
|
tiff->resolutionunit = 2;
|
||
|
|
tiff->rowsperstrip = 0xFFFFFFFF;
|
||
|
|
tiff->fillorder = 1;
|
||
|
|
tiff->planar = 1;
|
||
|
|
tiff->subfiletype = 0;
|
||
|
|
tiff->predictor = 1;
|
||
|
|
tiff->ycbcrsubsamp[0] = 2;
|
||
|
|
tiff->ycbcrsubsamp[1] = 2;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Read IFH
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* get byte order marker */
|
||
|
|
tiff->order = TII;
|
||
|
|
tiff->order = readshort(tiff);
|
||
|
|
if (tiff->order != TII && tiff->order != TMM)
|
||
|
|
return fz_throw("not a TIFF file, wrong magic marker");
|
||
|
|
|
||
|
|
/* check version */
|
||
|
|
version = readshort(tiff);
|
||
|
|
if (version != 42)
|
||
|
|
return fz_throw("not a TIFF file, wrong version marker");
|
||
|
|
|
||
|
|
/* get offset of IFD */
|
||
|
|
offset = readlong(tiff);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Read IFD
|
||
|
|
*/
|
||
|
|
|
||
|
|
tiff->rp = tiff->bp + offset;
|
||
|
|
|
||
|
|
count = readshort(tiff);
|
||
|
|
|
||
|
|
offset += 2;
|
||
|
|
for (i = 0; i < count; i++)
|
||
|
|
{
|
||
|
|
error = xps_read_tiff_tag(tiff, offset);
|
||
|
|
if (error)
|
||
|
|
return fz_rethrow(error, "cannot read TIFF header tag");
|
||
|
|
offset += 12;
|
||
|
|
}
|
||
|
|
|
||
|
|
return fz_okay;
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
xps_decode_tiff(fz_pixmap **imagep, byte *buf, int len)
|
||
|
|
{
|
||
|
|
int error;
|
||
|
|
fz_pixmap *image;
|
||
|
|
struct tiff tiff;
|
||
|
|
|
||
|
|
error = xps_decode_tiff_header(&tiff, buf, len);
|
||
|
|
if (error)
|
||
|
|
return fz_rethrow(error, "cannot decode tiff header");
|
||
|
|
|
||
|
|
/* Decode the image strips */
|
||
|
|
|
||
|
|
if (tiff.rowsperstrip > tiff.imagelength)
|
||
|
|
tiff.rowsperstrip = tiff.imagelength;
|
||
|
|
|
||
|
|
error = xps_decode_tiff_strips(&tiff);
|
||
|
|
if (error)
|
||
|
|
return fz_rethrow(error, "cannot decode image data");
|
||
|
|
|
||
|
|
/* Byte swap 16-bit images to big endian if necessary */
|
||
|
|
if (tiff.bitspersample == 16)
|
||
|
|
{
|
||
|
|
if (tiff.order == TII)
|
||
|
|
xps_swap_byte_order(tiff.samples, tiff.imagewidth * tiff.imagelength * tiff.samplesperpixel);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Expand into fz_pixmap struct */
|
||
|
|
|
||
|
|
image = fz_new_pixmap_with_limit(tiff.colorspace, tiff.imagewidth, tiff.imagelength);
|
||
|
|
if (!image)
|
||
|
|
{
|
||
|
|
if (tiff.colormap) fz_free(tiff.colormap);
|
||
|
|
if (tiff.stripoffsets) fz_free(tiff.stripoffsets);
|
||
|
|
if (tiff.stripbytecounts) fz_free(tiff.stripbytecounts);
|
||
|
|
if (tiff.samples) fz_free(tiff.samples);
|
||
|
|
return fz_throw("out of memory");
|
||
|
|
}
|
||
|
|
|
||
|
|
image->xres = tiff.xresolution;
|
||
|
|
image->yres = tiff.yresolution;
|
||
|
|
|
||
|
|
fz_unpack_tile(image, tiff.samples, tiff.samplesperpixel, tiff.bitspersample, tiff.stride, 0);
|
||
|
|
|
||
|
|
/* We should only do this on non-pre-multiplied images, but files in the wild are bad */
|
||
|
|
if (tiff.extrasamples /* == 2 */)
|
||
|
|
{
|
||
|
|
/* CMYK is a subtractive colorspace, we want additive for premul alpha */
|
||
|
|
if (image->n == 5)
|
||
|
|
{
|
||
|
|
fz_pixmap *rgb = fz_new_pixmap(fz_device_rgb, image->w, image->h);
|
||
|
|
fz_convert_pixmap(image, rgb);
|
||
|
|
rgb->xres = image->xres;
|
||
|
|
rgb->yres = image->yres;
|
||
|
|
fz_drop_pixmap(image);
|
||
|
|
image = rgb;
|
||
|
|
}
|
||
|
|
fz_premultiply_pixmap(image);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Clean up scratch memory */
|
||
|
|
|
||
|
|
if (tiff.colormap) fz_free(tiff.colormap);
|
||
|
|
if (tiff.stripoffsets) fz_free(tiff.stripoffsets);
|
||
|
|
if (tiff.stripbytecounts) fz_free(tiff.stripbytecounts);
|
||
|
|
if (tiff.samples) fz_free(tiff.samples);
|
||
|
|
|
||
|
|
*imagep = image;
|
||
|
|
return fz_okay;
|
||
|
|
}
|