void TIFFInput::readspec (bool read_meta) { uint32 width = 0, height = 0, depth = 0; unsigned short nchans = 1; TIFFGetField (m_tif, TIFFTAG_IMAGEWIDTH, &width); TIFFGetField (m_tif, TIFFTAG_IMAGELENGTH, &height); TIFFGetFieldDefaulted (m_tif, TIFFTAG_IMAGEDEPTH, &depth); TIFFGetFieldDefaulted (m_tif, TIFFTAG_SAMPLESPERPIXEL, &nchans); if (read_meta) { // clear the whole m_spec and start fresh m_spec = ImageSpec ((int)width, (int)height, (int)nchans); } else { // assume m_spec is valid, except for things that might differ // between MIP levels m_spec.width = (int)width; m_spec.height = (int)height; m_spec.depth = (int)depth; m_spec.full_x = 0; m_spec.full_y = 0; m_spec.full_z = 0; m_spec.full_width = (int)width; m_spec.full_height = (int)height; m_spec.full_depth = (int)depth; m_spec.nchannels = (int)nchans; } float x = 0, y = 0; TIFFGetField (m_tif, TIFFTAG_XPOSITION, &x); TIFFGetField (m_tif, TIFFTAG_YPOSITION, &y); m_spec.x = (int)x; m_spec.y = (int)y; m_spec.z = 0; // FIXME? - TIFF spec describes the positions as in resolutionunit. // What happens if this is not unitless pixels? Are we interpreting // it all wrong? if (TIFFGetField (m_tif, TIFFTAG_PIXAR_IMAGEFULLWIDTH, &width) == 1 && width > 0) m_spec.full_width = width; if (TIFFGetField (m_tif, TIFFTAG_PIXAR_IMAGEFULLLENGTH, &height) == 1 && height > 0) m_spec.full_height = height; if (TIFFIsTiled (m_tif)) { TIFFGetField (m_tif, TIFFTAG_TILEWIDTH, &m_spec.tile_width); TIFFGetField (m_tif, TIFFTAG_TILELENGTH, &m_spec.tile_height); TIFFGetFieldDefaulted (m_tif, TIFFTAG_TILEDEPTH, &m_spec.tile_depth); } else { m_spec.tile_width = 0; m_spec.tile_height = 0; m_spec.tile_depth = 0; } m_bitspersample = 8; TIFFGetField (m_tif, TIFFTAG_BITSPERSAMPLE, &m_bitspersample); m_spec.attribute ("oiio:BitsPerSample", (int)m_bitspersample); unsigned short sampleformat = SAMPLEFORMAT_UINT; TIFFGetFieldDefaulted (m_tif, TIFFTAG_SAMPLEFORMAT, &sampleformat); switch (m_bitspersample) { case 1: case 2: case 4: case 6: // Make 1, 2, 4, 6 bpp look like byte images case 8: if (sampleformat == SAMPLEFORMAT_UINT) m_spec.set_format (TypeDesc::UINT8); else if (sampleformat == SAMPLEFORMAT_INT) m_spec.set_format (TypeDesc::INT8); else m_spec.set_format (TypeDesc::UINT8); // punt break; case 10: case 12: case 14: // Make 10, 12, 14 bpp look like 16 bit images case 16: if (sampleformat == SAMPLEFORMAT_UINT) m_spec.set_format (TypeDesc::UINT16); else if (sampleformat == SAMPLEFORMAT_INT) m_spec.set_format (TypeDesc::INT16); else if (sampleformat == SAMPLEFORMAT_IEEEFP) m_spec.set_format (TypeDesc::HALF); // not to spec, but why not? else m_spec.set_format (TypeDesc::UNKNOWN); break; case 32: if (sampleformat == SAMPLEFORMAT_IEEEFP) m_spec.set_format (TypeDesc::FLOAT); else if (sampleformat == SAMPLEFORMAT_UINT) m_spec.set_format (TypeDesc::UINT32); else if (sampleformat == SAMPLEFORMAT_INT) m_spec.set_format (TypeDesc::INT32); else m_spec.set_format (TypeDesc::UNKNOWN); break; case 64: if (sampleformat == SAMPLEFORMAT_IEEEFP) m_spec.set_format (TypeDesc::DOUBLE); else m_spec.set_format (TypeDesc::UNKNOWN); break; default: m_spec.set_format (TypeDesc::UNKNOWN); break; } // If we've been instructed to skip reading metadata, because it is // guaranteed to be identical to what we already have in m_spec, // skip everything following. if (! read_meta) return; // Use the table for all the obvious things that can be mindlessly // shoved into the image spec. for (int i = 0; tiff_tag_table[i].name; ++i) find_tag (tiff_tag_table[i].tifftag, tiff_tag_table[i].tifftype, tiff_tag_table[i].name); // Now we need to get fields "by hand" for anything else that is less // straightforward... m_photometric = (m_spec.nchannels == 1 ? PHOTOMETRIC_MINISBLACK : PHOTOMETRIC_RGB); TIFFGetField (m_tif, TIFFTAG_PHOTOMETRIC, &m_photometric); m_spec.attribute ("tiff:PhotometricInterpretation", (int)m_photometric); if (m_photometric == PHOTOMETRIC_PALETTE) { // Read the color map unsigned short *r = NULL, *g = NULL, *b = NULL; TIFFGetField (m_tif, TIFFTAG_COLORMAP, &r, &g, &b); ASSERT (r != NULL && g != NULL && b != NULL); m_colormap.clear (); m_colormap.insert (m_colormap.end(), r, r + (1 << m_bitspersample)); m_colormap.insert (m_colormap.end(), g, g + (1 << m_bitspersample)); m_colormap.insert (m_colormap.end(), b, b + (1 << m_bitspersample)); // Palette TIFF images are always 3 channels (to the client) m_spec.nchannels = 3; m_spec.default_channel_names (); // FIXME - what about palette + extra (alpha?) channels? Is that // allowed? And if so, ever encountered in the wild? } TIFFGetFieldDefaulted (m_tif, TIFFTAG_PLANARCONFIG, &m_planarconfig); m_separate = (m_planarconfig == PLANARCONFIG_SEPARATE && m_spec.nchannels > 1 && m_photometric != PHOTOMETRIC_PALETTE); m_spec.attribute ("tiff:PlanarConfiguration", (int)m_planarconfig); if (m_planarconfig == PLANARCONFIG_SEPARATE) m_spec.attribute ("planarconfig", "separate"); else m_spec.attribute ("planarconfig", "contig"); int compress = 0; TIFFGetFieldDefaulted (m_tif, TIFFTAG_COMPRESSION, &compress); m_spec.attribute ("tiff:Compression", compress); switch (compress) { case COMPRESSION_NONE : m_spec.attribute ("compression", "none"); break; case COMPRESSION_LZW : m_spec.attribute ("compression", "lzw"); break; case COMPRESSION_CCITTRLE : m_spec.attribute ("compression", "ccittrle"); break; case COMPRESSION_DEFLATE : case COMPRESSION_ADOBE_DEFLATE : m_spec.attribute ("compression", "zip"); break; case COMPRESSION_PACKBITS : m_spec.attribute ("compression", "packbits"); break; default: break; } int rowsperstrip = -1; if (! m_spec.tile_width) { TIFFGetField (m_tif, TIFFTAG_ROWSPERSTRIP, &rowsperstrip); if (rowsperstrip > 0) m_spec.attribute ("tiff:RowsPerStrip", rowsperstrip); } // The libtiff docs say that only uncompressed images, or those with // rowsperstrip==1, support random access to scanlines. m_no_random_access = (compress != COMPRESSION_NONE && rowsperstrip != 1); short resunit = -1; TIFFGetField (m_tif, TIFFTAG_RESOLUTIONUNIT, &resunit); switch (resunit) { case RESUNIT_NONE : m_spec.attribute ("ResolutionUnit", "none"); break; case RESUNIT_INCH : m_spec.attribute ("ResolutionUnit", "in"); break; case RESUNIT_CENTIMETER : m_spec.attribute ("ResolutionUnit", "cm"); break; } get_matrix_attribute ("worldtocamera", TIFFTAG_PIXAR_MATRIX_WORLDTOCAMERA); get_matrix_attribute ("worldtoscreen", TIFFTAG_PIXAR_MATRIX_WORLDTOSCREEN); get_int_attribute ("tiff:subfiletype", TIFFTAG_SUBFILETYPE); // FIXME -- should subfiletype be "conventionized" and used for all // plugins uniformly? // Do we care about fillorder? No, the TIFF spec says, "We // recommend that FillOrder=2 (lsb-to-msb) be used only in // special-purpose applications". So OIIO will assume msb-to-lsb // convention until somebody finds a TIFF file in the wild that // breaks this assumption. // Special names for shadow maps char *s = NULL; TIFFGetField (m_tif, TIFFTAG_PIXAR_TEXTUREFORMAT, &s); if (s) m_emulate_mipmap = true; if (s && ! strcmp (s, "Shadow")) { for (int c = 0; c < m_spec.nchannels; ++c) m_spec.channelnames[c] = "z"; } unsigned short *sampleinfo = NULL; unsigned short extrasamples = 0; TIFFGetFieldDefaulted (m_tif, TIFFTAG_EXTRASAMPLES, &extrasamples, &sampleinfo); // std::cerr << "Extra samples = " << extrasamples << "\n"; bool alpha_is_unassociated = false; // basic assumption if (extrasamples) { // If the TIFF ExtraSamples tag was specified, use that to figure // out the meaning of alpha. int colorchannels = 3; if (m_photometric == PHOTOMETRIC_MINISWHITE || m_photometric == PHOTOMETRIC_MINISBLACK || m_photometric == PHOTOMETRIC_PALETTE || m_photometric == PHOTOMETRIC_MASK) colorchannels = 1; for (int i = 0, c = colorchannels; i < extrasamples && c < m_spec.nchannels; ++i, ++c) { // std::cerr << " extra " << i << " " << sampleinfo[i] << "\n"; if (sampleinfo[i] == EXTRASAMPLE_ASSOCALPHA) { // This is the alpha channel, associated as usual m_spec.alpha_channel = c; } else if (sampleinfo[i] == EXTRASAMPLE_UNASSALPHA) { // This is the alpha channel, but color is unassociated m_spec.alpha_channel = c; alpha_is_unassociated = true; m_spec.attribute ("oiio:UnassociatedAlpha", 1); } else { DASSERT (sampleinfo[i] == EXTRASAMPLE_UNSPECIFIED); // This extra channel is not alpha at all. Undo any // assumptions we previously made about this channel. if (m_spec.alpha_channel == c) { m_spec.channelnames[c] = Strutil::format("channel%d", c); m_spec.alpha_channel = -1; } } } if (m_spec.alpha_channel >= 0) m_spec.channelnames[m_spec.alpha_channel] = "A"; } // Will we need to do alpha conversions? m_convert_alpha = (m_spec.alpha_channel >= 0 && alpha_is_unassociated && ! m_keep_unassociated_alpha); // N.B. we currently ignore the following TIFF fields: // GrayResponseCurve GrayResponseUnit // MaxSampleValue MinSampleValue // NewSubfileType SubfileType(deprecated) // Colorimetry fields // Search for an EXIF IFD in the TIFF file, and if found, rummage // around for Exif fields. #if TIFFLIB_VERSION > 20050912 /* compat with old TIFF libs - skip Exif */ int exifoffset = 0; if (TIFFGetField (m_tif, TIFFTAG_EXIFIFD, &exifoffset) && TIFFReadEXIFDirectory (m_tif, exifoffset)) { for (int i = 0; exif_tag_table[i].name; ++i) find_tag (exif_tag_table[i].tifftag, exif_tag_table[i].tifftype, exif_tag_table[i].name); // I'm not sure what state TIFFReadEXIFDirectory leaves us. // So to be safe, close and re-seek. TIFFClose (m_tif); #ifdef _WIN32 std::wstring wfilename = Filesystem::path_to_windows_native (m_filename); m_tif = TIFFOpenW (wfilename.c_str(), "rm"); #else m_tif = TIFFOpen (m_filename.c_str(), "rm"); #endif TIFFSetDirectory (m_tif, m_subimage); // A few tidbits to look for ImageIOParameter *p; if ((p = m_spec.find_attribute ("Exif:ColorSpace", TypeDesc::INT))) { // Exif spec says that anything other than 0xffff==uncalibrated // should be interpreted to be sRGB. if (*(const int *)p->data() != 0xffff) m_spec.attribute ("oiio::ColorSpace", "sRGB"); } } #endif #if TIFFLIB_VERSION >= 20051230 // Search for IPTC metadata in IIM form -- but older versions of // libtiff botch the size, so ignore it for very old libtiff. int iptcsize = 0; const void *iptcdata = NULL; if (TIFFGetField (m_tif, TIFFTAG_RICHTIFFIPTC, &iptcsize, &iptcdata)) { std::vector<uint32> iptc ((uint32 *)iptcdata, (uint32 *)iptcdata+iptcsize); if (TIFFIsByteSwapped (m_tif)) TIFFSwabArrayOfLong ((uint32*)&iptc[0], iptcsize); decode_iptc_iim (&iptc[0], iptcsize*4, m_spec); } #endif // Search for an XML packet containing XMP (IPTC, Exif, etc.) int xmlsize = 0; const void *xmldata = NULL; if (TIFFGetField (m_tif, TIFFTAG_XMLPACKET, &xmlsize, &xmldata)) { // std::cerr << "Found XML data, size " << xmlsize << "\n"; if (xmldata && xmlsize) { std::string xml ((const char *)xmldata, xmlsize); decode_xmp (xml, m_spec); } } #if 0 // Experimental -- look for photoshop data int photoshopsize = 0; const void *photoshopdata = NULL; if (TIFFGetField (m_tif, TIFFTAG_PHOTOSHOP, &photoshopsize, &photoshopdata)) { std::cerr << "Found PHOTOSHOP data, size " << photoshopsize << "\n"; if (photoshopdata && photoshopsize) { // std::string photoshop ((const char *)photoshopdata, photoshopsize); // std::cerr << "PHOTOSHOP:\n" << photoshop << "\n---\n"; } } #endif }
bool JpgInput::open (const std::string &name, ImageSpec &newspec) { // Check that file exists and can be opened m_filename = name; m_fd = Filesystem::fopen (name, "rb"); if (m_fd == NULL) { error ("Could not open file \"%s\"", name.c_str()); return false; } // Check magic number to assure this is a JPEG file uint8_t magic[2] = {0, 0}; if (fread (magic, sizeof(magic), 1, m_fd) != 1) { error ("Empty file \"%s\"", name.c_str()); close_file (); return false; } rewind (m_fd); if (magic[0] != JPEG_MAGIC1 || magic[1] != JPEG_MAGIC2) { close_file (); error ("\"%s\" is not a JPEG file, magic number doesn't match (was 0x%x%x)", name.c_str(), int(magic[0]), int(magic[1])); return false; } // Set up the normal JPEG error routines, then override error_exit and // output_message so we intercept all the errors. m_cinfo.err = jpeg_std_error ((jpeg_error_mgr *)&m_jerr); m_jerr.pub.error_exit = my_error_exit; m_jerr.pub.output_message = my_output_message; if (setjmp (m_jerr.setjmp_buffer)) { // Jump to here if there's a libjpeg internal error // Prevent memory leaks, see example.c in jpeg distribution jpeg_destroy_decompress (&m_cinfo); close_file (); return false; } jpeg_create_decompress (&m_cinfo); // initialize decompressor jpeg_stdio_src (&m_cinfo, m_fd); // specify the data source // Request saving of EXIF and other special tags for later spelunking for (int mark = 0; mark < 16; ++mark) jpeg_save_markers (&m_cinfo, JPEG_APP0+mark, 0xffff); jpeg_save_markers (&m_cinfo, JPEG_COM, 0xffff); // comment marker // read the file parameters if (jpeg_read_header (&m_cinfo, FALSE) != JPEG_HEADER_OK || m_fatalerr) { error ("Bad JPEG header for \"%s\"", filename().c_str()); return false; } int nchannels = m_cinfo.num_components; if (m_cinfo.jpeg_color_space == JCS_CMYK || m_cinfo.jpeg_color_space == JCS_YCCK) { // CMYK jpegs get converted by us to RGB m_cinfo.out_color_space = JCS_CMYK; // pre-convert YCbCrK->CMYK nchannels = 3; m_cmyk = true; } if (m_raw) m_coeffs = jpeg_read_coefficients (&m_cinfo); else jpeg_start_decompress (&m_cinfo); // start working if (m_fatalerr) return false; m_next_scanline = 0; // next scanline we'll read m_spec = ImageSpec (m_cinfo.output_width, m_cinfo.output_height, nchannels, TypeDesc::UINT8); // Assume JPEG is in sRGB unless the Exif or XMP tags say otherwise. m_spec.attribute ("oiio:ColorSpace", "sRGB"); if (m_cinfo.jpeg_color_space == JCS_CMYK) m_spec.attribute ("jpeg:ColorSpace", "CMYK"); else if (m_cinfo.jpeg_color_space == JCS_YCCK) m_spec.attribute ("jpeg:ColorSpace", "YCbCrK"); // If the chroma subsampling is detected and matches something // we expect, then set an attribute so that it can be preserved // in future operations. std::string subsampling = comp_info_to_attr(m_cinfo); if (!subsampling.empty()) m_spec.attribute(JPEG_SUBSAMPLING_ATTR, subsampling); for (jpeg_saved_marker_ptr m = m_cinfo.marker_list; m; m = m->next) { if (m->marker == (JPEG_APP0+1) && ! strcmp ((const char *)m->data, "Exif")) { // The block starts with "Exif\0\0", so skip 6 bytes to get // to the start of the actual Exif data TIFF directory decode_exif ((unsigned char *)m->data+6, m->data_length-6, m_spec); } else if (m->marker == (JPEG_APP0+1) && ! strcmp ((const char *)m->data, "http://ns.adobe.com/xap/1.0/")) { #ifndef NDEBUG std::cerr << "Found APP1 XMP! length " << m->data_length << "\n"; #endif std::string xml ((const char *)m->data, m->data_length); decode_xmp (xml, m_spec); } else if (m->marker == (JPEG_APP0+13) && ! strcmp ((const char *)m->data, "Photoshop 3.0")) jpeg_decode_iptc ((unsigned char *)m->data); else if (m->marker == JPEG_COM) { if (! m_spec.find_attribute ("ImageDescription", TypeDesc::STRING)) m_spec.attribute ("ImageDescription", std::string ((const char *)m->data, m->data_length)); } } // Handle density/pixelaspect. We need to do this AFTER the exif is // decoded, in case it contains useful information. float xdensity = m_spec.get_float_attribute ("XResolution"); float ydensity = m_spec.get_float_attribute ("YResolution"); if (! xdensity || ! ydensity) { xdensity = float(m_cinfo.X_density); ydensity = float(m_cinfo.Y_density); if (xdensity && ydensity) { m_spec.attribute ("XResolution", xdensity); m_spec.attribute ("YResolution", ydensity); } } if (xdensity && ydensity) { float aspect = ydensity/xdensity; if (aspect != 1.0f) m_spec.attribute ("PixelAspectRatio", aspect); switch (m_cinfo.density_unit) { case 0 : m_spec.attribute ("ResolutionUnit", "none"); break; case 1 : m_spec.attribute ("ResolutionUnit", "in"); break; case 2 : m_spec.attribute ("ResolutionUnit", "cm"); break; } } read_icc_profile(&m_cinfo, m_spec); /// try to read icc profile newspec = m_spec; return true; }
void TIFFInput::readspec () { uint32 width = 0, height = 0, depth = 0; unsigned short nchans = 1; TIFFGetField (m_tif, TIFFTAG_IMAGEWIDTH, &width); TIFFGetField (m_tif, TIFFTAG_IMAGELENGTH, &height); TIFFGetFieldDefaulted (m_tif, TIFFTAG_IMAGEDEPTH, &depth); TIFFGetFieldDefaulted (m_tif, TIFFTAG_SAMPLESPERPIXEL, &nchans); m_spec = ImageSpec ((int)width, (int)height, (int)nchans); float x = 0, y = 0; TIFFGetField (m_tif, TIFFTAG_XPOSITION, &x); TIFFGetField (m_tif, TIFFTAG_YPOSITION, &y); m_spec.x = (int)x; m_spec.y = (int)y; m_spec.z = 0; // FIXME? - TIFF spec describes the positions as in resolutionunit. // What happens if this is not unitless pixels? Are we interpreting // it all wrong? if (TIFFGetField (m_tif, TIFFTAG_PIXAR_IMAGEFULLWIDTH, &width) == 1 && width > 0) m_spec.full_width = width; if (TIFFGetField (m_tif, TIFFTAG_PIXAR_IMAGEFULLLENGTH, &height) == 1 && height > 0) m_spec.full_height = height; if (TIFFIsTiled (m_tif)) { TIFFGetField (m_tif, TIFFTAG_TILEWIDTH, &m_spec.tile_width); TIFFGetField (m_tif, TIFFTAG_TILELENGTH, &m_spec.tile_height); TIFFGetFieldDefaulted (m_tif, TIFFTAG_TILEDEPTH, &m_spec.tile_depth); } else { m_spec.tile_width = 0; m_spec.tile_height = 0; m_spec.tile_depth = 0; } m_bitspersample = 8; TIFFGetField (m_tif, TIFFTAG_BITSPERSAMPLE, &m_bitspersample); m_spec.attribute ("oiio:BitsPerSample", (int)m_bitspersample); unsigned short sampleformat = SAMPLEFORMAT_UINT; TIFFGetFieldDefaulted (m_tif, TIFFTAG_SAMPLEFORMAT, &sampleformat); switch (m_bitspersample) { case 1: case 2: case 4: // Make 1, 2, 4 bpp look like byte images case 8: if (sampleformat == SAMPLEFORMAT_UINT) m_spec.set_format (TypeDesc::UINT8); else if (sampleformat == SAMPLEFORMAT_INT) m_spec.set_format (TypeDesc::INT8); else m_spec.set_format (TypeDesc::UINT8); // punt break; case 16: if (sampleformat == SAMPLEFORMAT_UINT) m_spec.set_format (TypeDesc::UINT16); else if (sampleformat == SAMPLEFORMAT_INT) m_spec.set_format (TypeDesc::INT16); break; case 32: if (sampleformat == SAMPLEFORMAT_IEEEFP) m_spec.set_format (TypeDesc::FLOAT); break; case 64: if (sampleformat == SAMPLEFORMAT_IEEEFP) m_spec.set_format (TypeDesc::DOUBLE); break; default: m_spec.set_format (TypeDesc::UNKNOWN); break; } // Use the table for all the obvious things that can be mindlessly // shoved into the image spec. for (int i = 0; tiff_tag_table[i].name; ++i) find_tag (tiff_tag_table[i].tifftag, tiff_tag_table[i].tifftype, tiff_tag_table[i].name); // Now we need to get fields "by hand" for anything else that is less // straightforward... m_photometric = (m_spec.nchannels == 1 ? PHOTOMETRIC_MINISBLACK : PHOTOMETRIC_RGB); TIFFGetField (m_tif, TIFFTAG_PHOTOMETRIC, &m_photometric); m_spec.attribute ("tiff:PhotometricInterpretation", (int)m_photometric); if (m_photometric == PHOTOMETRIC_PALETTE) { // Read the color map unsigned short *r = NULL, *g = NULL, *b = NULL; TIFFGetField (m_tif, TIFFTAG_COLORMAP, &r, &g, &b); ASSERT (r != NULL && g != NULL && b != NULL); m_colormap.clear (); m_colormap.insert (m_colormap.end(), r, r + (1 << m_bitspersample)); m_colormap.insert (m_colormap.end(), g, g + (1 << m_bitspersample)); m_colormap.insert (m_colormap.end(), b, b + (1 << m_bitspersample)); // Palette TIFF images are always 3 channels (to the client) m_spec.nchannels = 3; m_spec.default_channel_names (); } TIFFGetFieldDefaulted (m_tif, TIFFTAG_PLANARCONFIG, &m_planarconfig); m_spec.attribute ("tiff:PlanarConfiguration", (int)m_planarconfig); if (m_planarconfig == PLANARCONFIG_SEPARATE) m_spec.attribute ("planarconfig", "separate"); else m_spec.attribute ("planarconfig", "contig"); int compress = 0; TIFFGetFieldDefaulted (m_tif, TIFFTAG_COMPRESSION, &compress); m_spec.attribute ("tiff:Compression", compress); switch (compress) { case COMPRESSION_NONE : m_spec.attribute ("compression", "none"); break; case COMPRESSION_LZW : m_spec.attribute ("compression", "lzw"); break; case COMPRESSION_CCITTRLE : m_spec.attribute ("compression", "ccittrle"); break; case COMPRESSION_DEFLATE : case COMPRESSION_ADOBE_DEFLATE : m_spec.attribute ("compression", "zip"); break; case COMPRESSION_PACKBITS : m_spec.attribute ("compression", "packbits"); break; default: break; } int rowsperstrip = -1; if (! m_spec.tile_width) { TIFFGetField (m_tif, TIFFTAG_ROWSPERSTRIP, &rowsperstrip); if (rowsperstrip > 0) m_spec.attribute ("tiff:RowsPerStrip", rowsperstrip); } // The libtiff docs say that only uncompressed images, or those with // rowsperstrip==1, support random access to scanlines. m_no_random_access = (compress != COMPRESSION_NONE && rowsperstrip != 1); short resunit = -1; TIFFGetField (m_tif, TIFFTAG_RESOLUTIONUNIT, &resunit); switch (resunit) { case RESUNIT_NONE : m_spec.attribute ("ResolutionUnit", "none"); break; case RESUNIT_INCH : m_spec.attribute ("ResolutionUnit", "in"); break; case RESUNIT_CENTIMETER : m_spec.attribute ("ResolutionUnit", "cm"); break; } get_matrix_attribute ("worldtocamera", TIFFTAG_PIXAR_MATRIX_WORLDTOCAMERA); get_matrix_attribute ("worldtoscreen", TIFFTAG_PIXAR_MATRIX_WORLDTOSCREEN); get_int_attribute ("tiff:subfiletype", TIFFTAG_SUBFILETYPE); // FIXME -- should subfiletype be "conventionized" and used for all // plugins uniformly? // FIXME: do we care about fillorder for 1-bit and 4-bit images? // Special names for shadow maps char *s = NULL; TIFFGetField (m_tif, TIFFTAG_PIXAR_TEXTUREFORMAT, &s); if (s) m_emulate_mipmap = true; if (s && ! strcmp (s, "Shadow")) { for (int c = 0; c < m_spec.nchannels; ++c) m_spec.channelnames[c] = "z"; } // N.B. we currently ignore the following TIFF fields: // ExtraSamples // GrayResponseCurve GrayResponseUnit // MaxSampleValue MinSampleValue // NewSubfileType SubfileType(deprecated) // Colorimetry fields // Search for an EXIF IFD in the TIFF file, and if found, rummage // around for Exif fields. #if TIFFLIB_VERSION > 20050912 /* compat with old TIFF libs - skip Exif */ int exifoffset = 0; if (TIFFGetField (m_tif, TIFFTAG_EXIFIFD, &exifoffset) && TIFFReadEXIFDirectory (m_tif, exifoffset)) { for (int i = 0; exif_tag_table[i].name; ++i) find_tag (exif_tag_table[i].tifftag, exif_tag_table[i].tifftype, exif_tag_table[i].name); // I'm not sure what state TIFFReadEXIFDirectory leaves us. // So to be safe, close and re-seek. TIFFClose (m_tif); m_tif = TIFFOpen (m_filename.c_str(), "rm"); TIFFSetDirectory (m_tif, m_subimage); // A few tidbits to look for ImageIOParameter *p; if ((p = m_spec.find_attribute ("Exif:ColorSpace", TypeDesc::INT))) { // Exif spec says that anything other than 0xffff==uncalibrated // should be interpreted to be sRGB. if (*(const int *)p->data() != 0xffff) m_spec.attribute ("oiio::ColorSpace", "sRGB"); } } #endif #if TIFFLIB_VERSION >= 20051230 // Search for IPTC metadata in IIM form -- but older versions of // libtiff botch the size, so ignore it for very old libtiff. int iptcsize = 0; const void *iptcdata = NULL; if (TIFFGetField (m_tif, TIFFTAG_RICHTIFFIPTC, &iptcsize, &iptcdata)) { std::vector<uint32> iptc ((uint32 *)iptcdata, (uint32 *)iptcdata+iptcsize); if (TIFFIsByteSwapped (m_tif)) TIFFSwabArrayOfLong ((uint32*)&iptc[0], iptcsize); decode_iptc_iim (&iptc[0], iptcsize*4, m_spec); } #endif // Search for an XML packet containing XMP (IPTC, Exif, etc.) int xmlsize = 0; const void *xmldata = NULL; if (TIFFGetField (m_tif, TIFFTAG_XMLPACKET, &xmlsize, &xmldata)) { // std::cerr << "Found XML data, size " << xmlsize << "\n"; if (xmldata && xmlsize) { std::string xml ((const char *)xmldata, xmlsize); decode_xmp (xml, m_spec); } } #if 0 // Experimental -- look for photoshop data int photoshopsize = 0; const void *photoshopdata = NULL; if (TIFFGetField (m_tif, TIFFTAG_PHOTOSHOP, &photoshopsize, &photoshopdata)) { std::cerr << "Found PHOTOSHOP data, size " << photoshopsize << "\n"; if (photoshopdata && photoshopsize) { // std::string photoshop ((const char *)photoshopdata, photoshopsize); // std::cerr << "PHOTOSHOP:\n" << photoshop << "\n---\n"; } } #endif }