diff options
Diffstat (limited to 'fitz/image_tiff.c')
| -rw-r--r-- | fitz/image_tiff.c | 867 |
1 files changed, 0 insertions, 867 deletions
diff --git a/fitz/image_tiff.c b/fitz/image_tiff.c deleted file mode 100644 index 5806bc00..00000000 --- a/fitz/image_tiff.c +++ /dev/null @@ -1,867 +0,0 @@ -#include "mupdf/fitz.h" - -/* - * TIFF image loader. Should be enough to support TIFF files in XPS. - * Baseline TIFF 6.0 plus CMYK, LZW, Flate and JPEG support. - * Limited bit depths (1,2,4,8). - * Limited planar configurations (1=chunky). - * No tiles (easy fix if necessary). - * TODO: RGBPal images - */ - -struct tiff -{ - fz_context *ctx; - - /* "file" */ - unsigned char *bp, *rp, *ep; - - /* byte order */ - unsigned order; - - /* where we can find the strips of image data */ - unsigned rowsperstrip; - unsigned *stripoffsets; - unsigned *stripbytecounts; - - /* colormap */ - unsigned *colormap; - - unsigned stripoffsetslen; - unsigned stripbytecountslen; - unsigned colormaplen; - - /* assorted tags */ - unsigned subfiletype; - unsigned photometric; - unsigned compression; - unsigned imagewidth; - unsigned imagelength; - unsigned samplesperpixel; - unsigned bitspersample; - unsigned planar; - unsigned extrasamples; - unsigned xresolution; - unsigned yresolution; - unsigned resolutionunit; - unsigned fillorder; - unsigned g3opts; - unsigned g4opts; - unsigned predictor; - - unsigned ycbcrsubsamp[2]; - - unsigned char *jpegtables; /* point into "file" buffer */ - unsigned jpegtableslen; - - unsigned char *profile; - int profilesize; - - /* decoded data */ - fz_colorspace *colorspace; - unsigned char *samples; - int stride; -}; - -enum -{ - TII = 0x4949, /* 'II' */ - TMM = 0x4d4d, /* 'MM' */ - TBYTE = 1, - TASCII = 2, - TSHORT = 3, - TLONG = 4, - TRATIONAL = 5 -}; - -#define NewSubfileType 254 -#define ImageWidth 256 -#define ImageLength 257 -#define BitsPerSample 258 -#define Compression 259 -#define PhotometricInterpretation 262 -#define FillOrder 266 -#define StripOffsets 273 -#define SamplesPerPixel 277 -#define RowsPerStrip 278 -#define StripByteCounts 279 -#define XResolution 282 -#define YResolution 283 -#define PlanarConfiguration 284 -#define T4Options 292 -#define T6Options 293 -#define ResolutionUnit 296 -#define Predictor 317 -#define ColorMap 320 -#define TileWidth 322 -#define TileLength 323 -#define TileOffsets 324 -#define TileByteCounts 325 -#define ExtraSamples 338 -#define JPEGTables 347 -#define YCbCrSubSampling 520 -#define ICCProfile 34675 - -static const unsigned char bitrev[256] = -{ - 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, - 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, - 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, - 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, - 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, - 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, - 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, - 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, - 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, - 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, - 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, - 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, - 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, - 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, - 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, - 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, - 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, - 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, - 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, - 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, - 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, - 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, - 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, - 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, - 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, - 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, - 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, - 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, - 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, - 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, - 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, - 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff -}; - -static void -fz_decode_tiff_uncompressed(struct tiff *tiff, fz_stream *stm, unsigned char *wp, int wlen) -{ - fz_read(stm, wp, wlen); - fz_close(stm); -} - -static void -fz_decode_tiff_packbits(struct tiff *tiff, fz_stream *chain, unsigned char *wp, int wlen) -{ - fz_stream *stm = fz_open_rld(chain); - fz_read(stm, wp, wlen); - fz_close(stm); -} - -static void -fz_decode_tiff_lzw(struct tiff *tiff, fz_stream *chain, unsigned char *wp, int wlen) -{ - fz_stream *stm = fz_open_lzwd(chain, 1); - fz_read(stm, wp, wlen); - fz_close(stm); -} - -static void -fz_decode_tiff_flate(struct tiff *tiff, fz_stream *chain, unsigned char *wp, int wlen) -{ - fz_stream *stm = fz_open_flated(chain); - fz_read(stm, wp, wlen); - fz_close(stm); -} - -static void -fz_decode_tiff_fax(struct tiff *tiff, int comp, fz_stream *chain, unsigned char *wp, int wlen) -{ - fz_stream *stm; - int black_is_1 = tiff->photometric == 0; - int k = comp == 4 ? -1 : 0; - int encoded_byte_align = comp == 2; - stm = fz_open_faxd(chain, - k, 0, encoded_byte_align, - tiff->imagewidth, tiff->imagelength, 0, black_is_1); - fz_read(stm, wp, wlen); - fz_close(stm); -} - -static void -fz_decode_tiff_jpeg(struct tiff *tiff, fz_stream *chain, unsigned char *wp, int wlen) -{ - fz_stream *stm = fz_open_dctd(chain, -1); - fz_read(stm, wp, wlen); - fz_close(stm); -} - -static inline int getcomp(unsigned char *line, int x, int bpc) -{ - switch (bpc) - { - case 1: return (line[x >> 3] >> ( 7 - (x & 7) ) ) & 1; - case 2: return (line[x >> 2] >> ( ( 3 - (x & 3) ) << 1 ) ) & 3; - case 4: return (line[x >> 1] >> ( ( 1 - (x & 1) ) << 2 ) ) & 15; - case 8: return line[x]; - case 16: return line[x << 1] << 8 | line[(x << 1) + 1]; - } - return 0; -} - -static inline void putcomp(unsigned char *line, int x, int bpc, int value) -{ - int maxval = (1 << bpc) - 1; - - switch (bpc) - { - case 1: line[x >> 3] &= ~(maxval << (7 - (x & 7))); break; - case 2: line[x >> 2] &= ~(maxval << ((3 - (x & 3)) << 1)); break; - case 4: line[x >> 1] &= ~(maxval << ((1 - (x & 1)) << 2)); break; - } - - switch (bpc) - { - case 1: line[x >> 3] |= value << (7 - (x & 7)); break; - case 2: line[x >> 2] |= value << ((3 - (x & 3)) << 1); break; - case 4: line[x >> 1] |= value << ((1 - (x & 1)) << 2); break; - case 8: line[x] = value; break; - case 16: line[x << 1] = value >> 8; line[(x << 1) + 1] = value & 0xFF; break; - } -} - -static void -fz_unpredict_tiff(unsigned char *line, int width, int comps, int bits) -{ - unsigned char left[32]; - int i, k, v; - - for (k = 0; k < comps; k++) - left[k] = 0; - - for (i = 0; i < width; i++) - { - for (k = 0; k < comps; k++) - { - v = getcomp(line, i * comps + k, bits); - v = v + left[k]; - v = v % (1 << bits); - putcomp(line, i * comps + k, bits, v); - left[k] = v; - } - } -} - -static void -fz_invert_tiff(unsigned char *line, int width, int comps, int bits, int alpha) -{ - int i, k, v; - int m = (1 << bits) - 1; - - for (i = 0; i < width; i++) - { - for (k = 0; k < comps; k++) - { - v = getcomp(line, i * comps + k, bits); - if (!alpha || k < comps - 1) - v = m - v; - putcomp(line, i * comps + k, bits, v); - } - } -} - -static void -fz_expand_tiff_colormap(struct tiff *tiff) -{ - int maxval = 1 << tiff->bitspersample; - unsigned char *samples; - unsigned char *src, *dst; - unsigned int x, y; - unsigned int stride; - - /* colormap has first all red, then all green, then all blue values */ - /* colormap values are 0..65535, bits is 4 or 8 */ - /* image can be with or without extrasamples: comps is 1 or 2 */ - - if (tiff->samplesperpixel != 1 && tiff->samplesperpixel != 2) - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "invalid number of samples for RGBPal"); - - if (tiff->bitspersample != 4 && tiff->bitspersample != 8) - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "invalid number of bits for RGBPal"); - - if (tiff->colormaplen < (unsigned)maxval * 3) - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "insufficient colormap data"); - - stride = tiff->imagewidth * (tiff->samplesperpixel + 2); - - samples = fz_malloc(tiff->ctx, stride * tiff->imagelength); - - for (y = 0; y < tiff->imagelength; y++) - { - src = tiff->samples + (unsigned int)(tiff->stride * y); - dst = samples + (unsigned int)(stride * y); - - for (x = 0; x < tiff->imagewidth; x++) - { - if (tiff->extrasamples) - { - int c = getcomp(src, x * 2, tiff->bitspersample); - int a = getcomp(src, x * 2 + 1, tiff->bitspersample); - *dst++ = tiff->colormap[c + 0] >> 8; - *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; - fz_free(tiff->ctx, tiff->samples); - tiff->samples = samples; -} - -static void -fz_decode_tiff_strips(struct tiff *tiff) -{ - fz_stream *stm; - - /* switch on compression to create a filter */ - /* feed each strip to the filter */ - /* read out the data and pack the samples into a pixmap */ - - /* 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 */ - - unsigned char *wp; - unsigned row; - unsigned strip; - unsigned i; - - if (!tiff->rowsperstrip || !tiff->stripoffsets || !tiff->stripbytecounts) - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "no image data in tiff; maybe it is tiled"); - - if (tiff->stripoffsetslen < (tiff->imagelength - 1) / tiff->rowsperstrip + 1 || - tiff->stripbytecountslen < (tiff->imagelength - 1) / tiff->rowsperstrip + 1) - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "insufficient strip offset data"); - - if (tiff->planar != 1) - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "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(tiff->ctx); - break; - case 1: /* BlackIsZero */ - tiff->colorspace = fz_device_gray(tiff->ctx); - break; - case 2: /* RGB */ - tiff->colorspace = fz_device_rgb(tiff->ctx); - break; - case 3: /* RGBPal */ - tiff->colorspace = fz_device_rgb(tiff->ctx); - break; - case 5: /* CMYK */ - tiff->colorspace = fz_device_cmyk(tiff->ctx); - break; - case 6: /* YCbCr */ - /* it's probably a jpeg ... we let jpeg convert to rgb */ - tiff->colorspace = fz_device_rgb(tiff->ctx); - break; - default: - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "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_malloc_array(tiff->ctx, 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; - unsigned char *rp = tiff->bp + offset; - - if (wp + wlen > tiff->samples + (unsigned int)(tiff->stride * tiff->imagelength)) - wlen = tiff->samples + (unsigned int)(tiff->stride * tiff->imagelength) - wp; - - if (rp + rlen > tiff->ep) - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "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(tiff->ctx, rp, rlen); - - switch (tiff->compression) - { - case 1: - fz_decode_tiff_uncompressed(tiff, stm, wp, wlen); - break; - case 2: - fz_decode_tiff_fax(tiff, 2, stm, wp, wlen); - break; - case 3: - fz_decode_tiff_fax(tiff, 3, stm, wp, wlen); - break; - case 4: - fz_decode_tiff_fax(tiff, 4, stm, wp, wlen); - break; - case 5: - fz_decode_tiff_lzw(tiff, stm, wp, wlen); - break; - case 6: - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "deprecated JPEG in TIFF compression not supported"); - break; - case 7: - fz_decode_tiff_jpeg(tiff, stm, wp, wlen); - break; - case 8: - fz_decode_tiff_flate(tiff, stm, wp, wlen); - break; - case 32773: - fz_decode_tiff_packbits(tiff, stm, wp, wlen); - break; - default: - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "unknown TIFF compression: %d", tiff->compression); - } - - /* 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) - { - unsigned char *p = tiff->samples; - for (i = 0; i < tiff->imagelength; i++) - { - fz_unpredict_tiff(p, tiff->imagewidth, tiff->samplesperpixel, tiff->bitspersample); - p += tiff->stride; - } - } - - /* RGBPal */ - if (tiff->photometric == 3 && tiff->colormap) - fz_expand_tiff_colormap(tiff); - - /* WhiteIsZero .. invert */ - if (tiff->photometric == 0) - { - unsigned char *p = tiff->samples; - for (i = 0; i < tiff->imagelength; i++) - { - fz_invert_tiff(p, tiff->imagewidth, tiff->samplesperpixel, tiff->bitspersample, tiff->extrasamples); - p += tiff->stride; - } - } - - /* Premultiplied transparency */ - if (tiff->extrasamples == 1) - { - /* In GhostXPS we undo the premultiplication here; muxps holds - * all our images premultiplied by default, so nothing to do. - */ - } - - /* Non-premultiplied transparency */ - if (tiff->extrasamples == 2) - { - /* Premultiplied files are corrected for elsewhere */ - } -} - -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 -fz_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 -fz_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 void -fz_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: - fz_read_tiff_tag_value(&tiff->subfiletype, tiff, type, value, 1); - break; - case ImageWidth: - fz_read_tiff_tag_value(&tiff->imagewidth, tiff, type, value, 1); - break; - case ImageLength: - fz_read_tiff_tag_value(&tiff->imagelength, tiff, type, value, 1); - break; - case BitsPerSample: - fz_read_tiff_tag_value(&tiff->bitspersample, tiff, type, value, 1); - break; - case Compression: - fz_read_tiff_tag_value(&tiff->compression, tiff, type, value, 1); - break; - case PhotometricInterpretation: - fz_read_tiff_tag_value(&tiff->photometric, tiff, type, value, 1); - break; - case FillOrder: - fz_read_tiff_tag_value(&tiff->fillorder, tiff, type, value, 1); - break; - case SamplesPerPixel: - fz_read_tiff_tag_value(&tiff->samplesperpixel, tiff, type, value, 1); - break; - case RowsPerStrip: - fz_read_tiff_tag_value(&tiff->rowsperstrip, tiff, type, value, 1); - break; - case XResolution: - fz_read_tiff_tag_value(&tiff->xresolution, tiff, type, value, 1); - break; - case YResolution: - fz_read_tiff_tag_value(&tiff->yresolution, tiff, type, value, 1); - break; - case PlanarConfiguration: - fz_read_tiff_tag_value(&tiff->planar, tiff, type, value, 1); - break; - case T4Options: - fz_read_tiff_tag_value(&tiff->g3opts, tiff, type, value, 1); - break; - case T6Options: - fz_read_tiff_tag_value(&tiff->g4opts, tiff, type, value, 1); - break; - case Predictor: - fz_read_tiff_tag_value(&tiff->predictor, tiff, type, value, 1); - break; - case ResolutionUnit: - fz_read_tiff_tag_value(&tiff->resolutionunit, tiff, type, value, 1); - break; - case YCbCrSubSampling: - fz_read_tiff_tag_value(tiff->ycbcrsubsamp, tiff, type, value, 2); - break; - case ExtraSamples: - fz_read_tiff_tag_value(&tiff->extrasamples, tiff, type, value, 1); - break; - - case ICCProfile: - tiff->profile = fz_malloc(tiff->ctx, count); - /* ICC profile data type is set to UNDEFINED. - * TBYTE reading not correct in fz_read_tiff_tag_value */ - fz_read_tiff_bytes(tiff->profile, tiff, value, count); - tiff->profilesize = count; - break; - - case JPEGTables: - fz_warn(tiff->ctx, "jpeg tables in tiff not implemented"); - tiff->jpegtables = tiff->bp + value; - tiff->jpegtableslen = count; - break; - - case StripOffsets: - tiff->stripoffsets = fz_malloc_array(tiff->ctx, count, sizeof(unsigned)); - fz_read_tiff_tag_value(tiff->stripoffsets, tiff, type, value, count); - tiff->stripoffsetslen = count; - break; - - case StripByteCounts: - tiff->stripbytecounts = fz_malloc_array(tiff->ctx, count, sizeof(unsigned)); - fz_read_tiff_tag_value(tiff->stripbytecounts, tiff, type, value, count); - tiff->stripbytecountslen = count; - break; - - case ColorMap: - tiff->colormap = fz_malloc_array(tiff->ctx, count, sizeof(unsigned)); - fz_read_tiff_tag_value(tiff->colormap, tiff, type, value, count); - tiff->colormaplen = count; - break; - - case TileWidth: - case TileLength: - case TileOffsets: - case TileByteCounts: - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "tiled tiffs not supported"); - - default: - /* printf("unknown tag: %d t=%d n=%d\n", tag, type, count); */ - break; - } -} - -static void -fz_swap_tiff_byte_order(unsigned char *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 void -fz_decode_tiff_header(fz_context *ctx, struct tiff *tiff, unsigned char *buf, int len) -{ - unsigned version; - unsigned offset; - unsigned count; - unsigned i; - - memset(tiff, 0, sizeof(struct tiff)); - tiff->ctx = ctx; - 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) - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "not a TIFF file, wrong magic marker"); - - /* check version */ - version = readshort(tiff); - if (version != 42) - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "not a TIFF file, wrong version marker"); - - /* get offset of IFD */ - offset = readlong(tiff); - - /* - * Read IFD - */ - - tiff->rp = tiff->bp + offset; - - if (tiff->rp < tiff->bp || tiff->rp > tiff->ep) - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "invalid IFD offset %u", offset); - - count = readshort(tiff); - - if (count * 12 > (unsigned)(tiff->ep - tiff->rp)) - fz_throw(tiff->ctx, FZ_ERROR_GENERIC, "overlarge IFD entry count %u", count); - - offset += 2; - for (i = 0; i < count; i++) - { - fz_read_tiff_tag(tiff, offset); - offset += 12; - } -} - -fz_pixmap * -fz_load_tiff(fz_context *ctx, unsigned char *buf, int len) -{ - fz_pixmap *image; - struct tiff tiff; - - fz_try(ctx) - { - fz_decode_tiff_header(ctx, &tiff, buf, len); - - /* Decode the image strips */ - - if (tiff.rowsperstrip > tiff.imagelength) - tiff.rowsperstrip = tiff.imagelength; - - fz_decode_tiff_strips(&tiff); - - /* Byte swap 16-bit images to big endian if necessary */ - if (tiff.bitspersample == 16) - if (tiff.order == TII) - fz_swap_tiff_byte_order(tiff.samples, tiff.imagewidth * tiff.imagelength * tiff.samplesperpixel); - - /* Expand into fz_pixmap struct */ - image = fz_new_pixmap(tiff.ctx, tiff.colorspace, tiff.imagewidth, tiff.imagelength); - 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(tiff.ctx, fz_device_rgb(ctx), image->w, image->h); - fz_convert_pixmap(tiff.ctx, rgb, image); - rgb->xres = image->xres; - rgb->yres = image->yres; - fz_drop_pixmap(ctx, image); - image = rgb; - } - fz_premultiply_pixmap(ctx, image); - } - } - fz_always(ctx) - { - /* Clean up scratch memory */ - if (tiff.colormap) fz_free(ctx, tiff.colormap); - if (tiff.stripoffsets) fz_free(ctx, tiff.stripoffsets); - if (tiff.stripbytecounts) fz_free(ctx, tiff.stripbytecounts); - if (tiff.samples) fz_free(ctx, tiff.samples); - if (tiff.profile) fz_free(ctx, tiff.profile); - } - fz_catch(ctx) - { - fz_rethrow_message(ctx, "out of memory loading tiff"); - } - - return image; -} - -void -fz_load_tiff_info(fz_context *ctx, unsigned char *buf, int len, int *wp, int *hp, int *xresp, int *yresp, fz_colorspace **cspacep) -{ - struct tiff tiff; - - fz_try(ctx) - { - fz_decode_tiff_header(ctx, &tiff, buf, len); - - *wp = tiff.imagewidth; - *hp = tiff.imagelength; - *xresp = tiff.xresolution; - *yresp = tiff.yresolution; - *cspacep = tiff.colorspace; - } - fz_always(ctx) - { - /* Clean up scratch memory */ - if (tiff.colormap) fz_free(ctx, tiff.colormap); - if (tiff.stripoffsets) fz_free(ctx, tiff.stripoffsets); - if (tiff.stripbytecounts) fz_free(ctx, tiff.stripbytecounts); - if (tiff.samples) fz_free(ctx, tiff.samples); - if (tiff.profile) fz_free(ctx, tiff.profile); - } - fz_catch(ctx) - { - fz_rethrow_message(ctx, "out of memory loading tiff"); - } -} |