X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/e7c80f9e052d3d50b3d7780b21e55d8c5586cdea..51ec29ea5d1d1093bafbae27a8483211a90d9659:/src/common/imagtiff.cpp diff --git a/src/common/imagtiff.cpp b/src/common/imagtiff.cpp index 1b108699a8..3dccff9618 100644 --- a/src/common/imagtiff.cpp +++ b/src/common/imagtiff.cpp @@ -7,6 +7,14 @@ // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// +// ============================================================================ +// declarations +// ============================================================================ + +// ---------------------------------------------------------------------------- +// headers +// ---------------------------------------------------------------------------- + // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" @@ -17,38 +25,97 @@ #if wxUSE_IMAGE && wxUSE_LIBTIFF #include "wx/imagtiff.h" +#include "wx/versioninfo.h" #ifndef WX_PRECOMP #include "wx/log.h" #include "wx/app.h" #include "wx/intl.h" + #include "wx/bitmap.h" + #include "wx/module.h" + #include "wx/wxcrtvararg.h" #endif -#include "wx/bitmap.h" - extern "C" { +#ifdef __DMC__ + #include "tif_config.h" +#endif #include "tiff.h" #include "tiffio.h" } #include "wx/filefn.h" #include "wx/wfstream.h" -#include "wx/module.h" #ifndef TIFFLINKAGEMODE - #if defined(__WATCOMC__) && defined(__WXMGL__) - #define TIFFLINKAGEMODE cdecl - #else - #define TIFFLINKAGEMODE LINKAGEMODE - #endif + #if defined(__WATCOMC__) && defined(__WXMGL__) + #define TIFFLINKAGEMODE cdecl + #else + #define TIFFLINKAGEMODE LINKAGEMODE + #endif #endif +// ============================================================================ +// implementation +// ============================================================================ + +// ---------------------------------------------------------------------------- +// TIFF library error/warning handlers +// ---------------------------------------------------------------------------- + +static wxString +FormatTiffMessage(const char *module, const char *fmt, va_list ap) +{ + char buf[512]; + if ( wxCRT_VsnprintfA(buf, WXSIZEOF(buf), fmt, ap) <= 0 ) + { + // this isn't supposed to happen, but if it does, it's better + // than nothing + strcpy(buf, "Incorrectly formatted TIFF message"); + } + buf[WXSIZEOF(buf)-1] = 0; // make sure it is always NULL-terminated + + wxString msg(buf); + if ( module ) + msg += wxString::Format(_(" (in module \"%s\")"), module); + + return msg; +} + +extern "C" +{ + +static void +TIFFwxWarningHandler(const char* module, const char *fmt, va_list ap) +{ + wxLogWarning("%s", FormatTiffMessage(module, fmt, ap)); +} + +static void +TIFFwxErrorHandler(const char* module, const char *fmt, va_list ap) +{ + wxLogError("%s", FormatTiffMessage(module, fmt, ap)); +} + +} // extern "C" + //----------------------------------------------------------------------------- // wxTIFFHandler //----------------------------------------------------------------------------- IMPLEMENT_DYNAMIC_CLASS(wxTIFFHandler,wxImageHandler) +wxTIFFHandler::wxTIFFHandler() +{ + m_name = wxT("TIFF file"); + m_extension = wxT("tif"); + m_altExtensions.Add(wxT("tiff")); + m_type = wxBITMAP_TYPE_TIFF; + m_mime = wxT("image/tiff"); + TIFFSetWarningHandler((TIFFErrorHandler) TIFFwxWarningHandler); + TIFFSetErrorHandler((TIFFErrorHandler) TIFFwxErrorHandler); +} + #if wxUSE_STREAMS // helper to translate our, possibly 64 bit, wxFileOffset to TIFF, always 32 @@ -60,7 +127,7 @@ static toff_t wxFileOffsetToTIFF(wxFileOffset ofs) toff_t tofs = wx_truncate_cast(toff_t, ofs); wxCHECK_MSG( (wxFileOffset)tofs == ofs, (toff_t)-1, - _T("TIFF library doesn't support large files") ); + wxT("TIFF library doesn't support large files") ); return tofs; } @@ -88,7 +155,7 @@ extern "C" { tsize_t TIFFLINKAGEMODE -_tiffNullProc(thandle_t WXUNUSED(handle), +wxTIFFNullProc(thandle_t WXUNUSED(handle), tdata_t WXUNUSED(buf), tsize_t WXUNUSED(size)) { @@ -96,7 +163,7 @@ _tiffNullProc(thandle_t WXUNUSED(handle), } tsize_t TIFFLINKAGEMODE -_tiffReadProc(thandle_t handle, tdata_t buf, tsize_t size) +wxTIFFReadProc(thandle_t handle, tdata_t buf, tsize_t size) { wxInputStream *stream = (wxInputStream*) handle; stream->Read( (void*) buf, (size_t) size ); @@ -104,7 +171,7 @@ _tiffReadProc(thandle_t handle, tdata_t buf, tsize_t size) } tsize_t TIFFLINKAGEMODE -_tiffWriteProc(thandle_t handle, tdata_t buf, tsize_t size) +wxTIFFWriteProc(thandle_t handle, tdata_t buf, tsize_t size) { wxOutputStream *stream = (wxOutputStream*) handle; stream->Write( (void*) buf, (size_t) size ); @@ -112,7 +179,7 @@ _tiffWriteProc(thandle_t handle, tdata_t buf, tsize_t size) } toff_t TIFFLINKAGEMODE -_tiffSeekIProc(thandle_t handle, toff_t off, int whence) +wxTIFFSeekIProc(thandle_t handle, toff_t off, int whence) { wxInputStream *stream = (wxInputStream*) handle; @@ -121,29 +188,72 @@ _tiffSeekIProc(thandle_t handle, toff_t off, int whence) } toff_t TIFFLINKAGEMODE -_tiffSeekOProc(thandle_t handle, toff_t off, int whence) +wxTIFFSeekOProc(thandle_t handle, toff_t off, int whence) { wxOutputStream *stream = (wxOutputStream*) handle; - return wxFileOffsetToTIFF(stream->SeekO((wxFileOffset)off, - wxSeekModeFromTIFF(whence))); + toff_t offset = wxFileOffsetToTIFF( + stream->SeekO((wxFileOffset)off, wxSeekModeFromTIFF(whence)) ); + + if (offset != (toff_t) -1 || whence != SEEK_SET) + { + return offset; + } + + + /* + Try to workaround problems with libtiff seeking past the end of streams. + + This occurs when libtiff is writing tag entries past the end of a + stream but hasn't written the directory yet (which will be placed + before the tags and contain offsets to the just written tags). + The behaviour for seeking past the end of a stream is not consistent + and doesn't work with for example wxMemoryOutputStream. When this type + of seeking fails (with SEEK_SET), fill in the gap with zeroes and try + again. + */ + + wxFileOffset streamLength = stream->GetLength(); + if (streamLength != wxInvalidOffset && (wxFileOffset) off > streamLength) + { + if (stream->SeekO(streamLength, wxFromStart) == wxInvalidOffset) + { + return (toff_t) -1; + } + + for (wxFileOffset i = 0; i < (wxFileOffset) off - streamLength; ++i) + { + stream->PutC(0); + } + } + + return wxFileOffsetToTIFF( stream->TellO() ); +} + +int TIFFLINKAGEMODE +wxTIFFCloseIProc(thandle_t WXUNUSED(handle)) +{ + // there is no need to close the input stream + return 0; } int TIFFLINKAGEMODE -_tiffCloseProc(thandle_t WXUNUSED(handle)) +wxTIFFCloseOProc(thandle_t handle) { - return 0; // ? + wxOutputStream *stream = (wxOutputStream*) handle; + + return stream->Close() ? 0 : -1; } toff_t TIFFLINKAGEMODE -_tiffSizeProc(thandle_t handle) +wxTIFFSizeProc(thandle_t handle) { wxStreamBase *stream = (wxStreamBase*) handle; return (toff_t) stream->GetSize(); } int TIFFLINKAGEMODE -_tiffMapProc(thandle_t WXUNUSED(handle), +wxTIFFMapProc(thandle_t WXUNUSED(handle), tdata_t* WXUNUSED(pbase), toff_t* WXUNUSED(psize)) { @@ -151,44 +261,12 @@ _tiffMapProc(thandle_t WXUNUSED(handle), } void TIFFLINKAGEMODE -_tiffUnmapProc(thandle_t WXUNUSED(handle), +wxTIFFUnmapProc(thandle_t WXUNUSED(handle), tdata_t WXUNUSED(base), toff_t WXUNUSED(size)) { } -static void -TIFFwxWarningHandler(const char* module, - const char* WXUNUSED_IN_UNICODE(fmt), - va_list WXUNUSED_IN_UNICODE(ap)) -{ - if (module != NULL) - wxLogWarning(_("tiff module: %s"), wxString::FromAscii(module).c_str()); - - // FIXME: this is not terrible informative but better than crashing! -#if wxUSE_UNICODE - wxLogWarning(_("TIFF library warning.")); -#else - wxVLogWarning(fmt, ap); -#endif -} - -static void -TIFFwxErrorHandler(const char* module, - const char* WXUNUSED_IN_UNICODE(fmt), - va_list WXUNUSED_IN_UNICODE(ap)) -{ - if (module != NULL) - wxLogError(_("tiff module: %s"), wxString::FromAscii(module).c_str()); - - // FIXME: as above -#if wxUSE_UNICODE - wxLogError(_("TIFF library error.")); -#else - wxVLogError(fmt, ap); -#endif -} - } // extern "C" TIFF* @@ -196,9 +274,9 @@ TIFFwxOpen(wxInputStream &stream, const char* name, const char* mode) { TIFF* tif = TIFFClientOpen(name, mode, (thandle_t) &stream, - _tiffReadProc, _tiffNullProc, - _tiffSeekIProc, _tiffCloseProc, _tiffSizeProc, - _tiffMapProc, _tiffUnmapProc); + wxTIFFReadProc, wxTIFFNullProc, + wxTIFFSeekIProc, wxTIFFCloseIProc, wxTIFFSizeProc, + wxTIFFMapProc, wxTIFFUnmapProc); return tif; } @@ -208,23 +286,13 @@ TIFFwxOpen(wxOutputStream &stream, const char* name, const char* mode) { TIFF* tif = TIFFClientOpen(name, mode, (thandle_t) &stream, - _tiffNullProc, _tiffWriteProc, - _tiffSeekOProc, _tiffCloseProc, _tiffSizeProc, - _tiffMapProc, _tiffUnmapProc); + wxTIFFNullProc, wxTIFFWriteProc, + wxTIFFSeekOProc, wxTIFFCloseOProc, wxTIFFSizeProc, + wxTIFFMapProc, wxTIFFUnmapProc); return tif; } -wxTIFFHandler::wxTIFFHandler() -{ - m_name = wxT("TIFF file"); - m_extension = wxT("tif"); - m_type = wxBITMAP_TYPE_TIF; - m_mime = wxT("image/tiff"); - TIFFSetWarningHandler((TIFFErrorHandler) TIFFwxWarningHandler); - TIFFSetErrorHandler((TIFFErrorHandler) TIFFwxErrorHandler); -} - bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int index ) { if (index == -1) @@ -237,7 +305,9 @@ bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos if (!tif) { if (verbose) + { wxLogError( _("TIFF: Error loading image.") ); + } return false; } @@ -245,7 +315,9 @@ bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos if (!TIFFSetDirectory( tif, (tdir_t)index )) { if (verbose) + { wxLogError( _("Invalid TIFF image index.") ); + } TIFFClose( tif ); @@ -253,20 +325,57 @@ bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos } uint32 w, h; - uint32 npixels; uint32 *raster; TIFFGetField( tif, TIFFTAG_IMAGEWIDTH, &w ); TIFFGetField( tif, TIFFTAG_IMAGELENGTH, &h ); - npixels = w * h; + uint16 samplesPerPixel = 0; + (void) TIFFGetFieldDefaulted(tif, TIFFTAG_SAMPLESPERPIXEL, &samplesPerPixel); + + uint16 bitsPerSample = 0; + (void) TIFFGetFieldDefaulted(tif, TIFFTAG_BITSPERSAMPLE, &bitsPerSample); + + uint16 extraSamples; + uint16* samplesInfo; + TIFFGetFieldDefaulted(tif, TIFFTAG_EXTRASAMPLES, + &extraSamples, &samplesInfo); + + uint16 photometric; + if (!TIFFGetField(tif, TIFFTAG_PHOTOMETRIC, &photometric)) + { + photometric = PHOTOMETRIC_MINISWHITE; + } + const bool hasAlpha = (extraSamples >= 1 + && ((samplesInfo[0] == EXTRASAMPLE_UNSPECIFIED) + || samplesInfo[0] == EXTRASAMPLE_ASSOCALPHA + || samplesInfo[0] == EXTRASAMPLE_UNASSALPHA)) + || (extraSamples == 0 && samplesPerPixel == 4 + && photometric == PHOTOMETRIC_RGB); + + // guard against integer overflow during multiplication which could result + // in allocating a too small buffer and then overflowing it + const double bytesNeeded = (double)w * (double)h * sizeof(uint32); + if ( bytesNeeded >= wxUINT32_MAX ) + { + if ( verbose ) + { + wxLogError( _("TIFF: Image size is abnormally big.") ); + } - raster = (uint32*) _TIFFmalloc( npixels * sizeof(uint32) ); + TIFFClose(tif); + + return false; + } + + raster = (uint32*) _TIFFmalloc( (uint32)bytesNeeded ); if (!raster) { if (verbose) + { wxLogError( _("TIFF: Couldn't allocate memory.") ); + } TIFFClose( tif ); @@ -274,10 +383,12 @@ bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos } image->Create( (int)w, (int)h ); - if (!image->Ok()) + if (!image->IsOk()) { if (verbose) + { wxLogError( _("TIFF: Couldn't allocate memory.") ); + } _TIFFfree( raster ); TIFFClose( tif ); @@ -285,10 +396,85 @@ bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos return false; } - if (!TIFFReadRGBAImage( tif, w, h, raster, 0 )) + if ( hasAlpha ) + image->SetAlpha(); + + uint16 planarConfig = PLANARCONFIG_CONTIG; + (void) TIFFGetField(tif, TIFFTAG_PLANARCONFIG, &planarConfig); + + bool ok = true; + char msg[1024] = ""; + if + ( + (planarConfig == PLANARCONFIG_CONTIG && samplesPerPixel == 2 + && extraSamples == 1) + && + ( + ( !TIFFRGBAImageOK(tif, msg) ) + || (bitsPerSample == 8) + ) + ) + { + const bool isGreyScale = (bitsPerSample == 8); + unsigned char *buf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(tif)); + uint32 pos = 0; + const bool minIsWhite = (photometric == PHOTOMETRIC_MINISWHITE); + const int minValue = minIsWhite ? 255 : 0; + const int maxValue = 255 - minValue; + + /* + Decode to ABGR format as that is what the code, that converts to + wxImage, later on expects (normally TIFFReadRGBAImageOriented is + used to decode which uses an ABGR layout). + */ + for (uint32 y = 0; y < h; ++y) + { + if (TIFFReadScanline(tif, buf, y, 0) != 1) + { + ok = false; + break; + } + + if (isGreyScale) + { + for (uint32 x = 0; x < w; ++x) + { + uint8 val = minIsWhite ? 255 - buf[x*2] : buf[x*2]; + uint8 alpha = minIsWhite ? 255 - buf[x*2+1] : buf[x*2+1]; + raster[pos] = val + (val << 8) + (val << 16) + + (alpha << 24); + pos++; + } + } + else + { + for (uint32 x = 0; x < w; ++x) + { + int mask = buf[x*2/8] << ((x*2)%8); + + uint8 val = mask & 128 ? maxValue : minValue; + raster[pos] = val + (val << 8) + (val << 16) + + ((mask & 64 ? maxValue : minValue) << 24); + pos++; + } + } + } + + _TIFFfree(buf); + } + else + { + ok = TIFFReadRGBAImageOriented( tif, w, h, raster, + ORIENTATION_TOPLEFT, 0 ) != 0; + } + + + if (!ok) { if (verbose) + { wxLogError( _("TIFF: Error reading image.") ); + } _TIFFfree( raster ); image->Destroy(); @@ -297,51 +483,109 @@ bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos return false; } - bool hasmask = false; - unsigned char *ptr = image->GetData(); - ptr += w*3*(h-1); + + unsigned char *alpha = image->GetAlpha(); + uint32 pos = 0; for (uint32 i = 0; i < h; i++) { for (uint32 j = 0; j < w; j++) { - unsigned char alpha = (unsigned char)TIFFGetA(raster[pos]); - if (alpha < 127) - { - hasmask = true; - ptr[0] = image->GetMaskRed(); - ptr++; - ptr[0] = image->GetMaskGreen(); - ptr++; - ptr[0] = image->GetMaskBlue(); - ptr++; - } - else - { - ptr[0] = (unsigned char)TIFFGetR(raster[pos]); - ptr++; - ptr[0] = (unsigned char)TIFFGetG(raster[pos]); - ptr++; - ptr[0] = (unsigned char)TIFFGetB(raster[pos]); - ptr++; - } + *(ptr++) = (unsigned char)TIFFGetR(raster[pos]); + *(ptr++) = (unsigned char)TIFFGetG(raster[pos]); + *(ptr++) = (unsigned char)TIFFGetB(raster[pos]); + if ( hasAlpha ) + *(alpha++) = (unsigned char)TIFFGetA(raster[pos]); + pos++; } - ptr -= 2*w*3; // subtract line we just added plus one line + } + + + image->SetOption(wxIMAGE_OPTION_TIFF_PHOTOMETRIC, photometric); + + uint16 compression; + /* + Copy some baseline TIFF tags which helps when re-saving a TIFF + to be similar to the original image. + */ + if (samplesPerPixel) + { + image->SetOption(wxIMAGE_OPTION_TIFF_SAMPLESPERPIXEL, samplesPerPixel); + } + + if (bitsPerSample) + { + image->SetOption(wxIMAGE_OPTION_TIFF_BITSPERSAMPLE, bitsPerSample); + } + + if ( TIFFGetFieldDefaulted(tif, TIFFTAG_COMPRESSION, &compression) ) + { + image->SetOption(wxIMAGE_OPTION_TIFF_COMPRESSION, compression); + } + + // Set the resolution unit. + wxImageResolution resUnit = wxIMAGE_RESOLUTION_NONE; + uint16 tiffRes; + if ( TIFFGetFieldDefaulted(tif, TIFFTAG_RESOLUTIONUNIT, &tiffRes) ) + { + switch (tiffRes) + { + default: + wxLogWarning(_("Unknown TIFF resolution unit %d ignored"), + tiffRes); + // fall through + + case RESUNIT_NONE: + resUnit = wxIMAGE_RESOLUTION_NONE; + break; + + case RESUNIT_INCH: + resUnit = wxIMAGE_RESOLUTION_INCHES; + break; + + case RESUNIT_CENTIMETER: + resUnit = wxIMAGE_RESOLUTION_CM; + break; + } + } + + image->SetOption(wxIMAGE_OPTION_RESOLUTIONUNIT, resUnit); + + /* + Set the image resolution if it's available. Resolution tag is not + dependant on RESOLUTIONUNIT != RESUNIT_NONE (according to TIFF spec). + */ + float resX, resY; + + if ( TIFFGetField(tif, TIFFTAG_XRESOLUTION, &resX) ) + { + /* + Use a string value to not lose precision. + rounding to int as cm and then converting to inch may + result in whole integer rounding error, eg. 201 instead of 200 dpi. + If an app wants an int, GetOptionInt will convert and round down. + */ + image->SetOption(wxIMAGE_OPTION_RESOLUTIONX, + wxString::FromCDouble((double) resX)); + } + + if ( TIFFGetField(tif, TIFFTAG_YRESOLUTION, &resY) ) + { + image->SetOption(wxIMAGE_OPTION_RESOLUTIONY, + wxString::FromCDouble((double) resY)); } _TIFFfree( raster ); TIFFClose( tif ); - image->SetMask( hasmask ); - return true; } -int wxTIFFHandler::GetImageCount( wxInputStream& stream ) +int wxTIFFHandler::DoGetImageCount( wxInputStream& stream ) { TIFF *tif = TIFFwxOpen( stream, "image", "r" ); @@ -355,6 +599,9 @@ int wxTIFFHandler::GetImageCount( wxInputStream& stream ) TIFFClose( tif ); + // NOTE: this function modifies the current stream position but it's ok + // (see wxImageHandler::GetImageCount) + return dircount; } @@ -365,65 +612,142 @@ bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo if (!tif) { if (verbose) + { wxLogError( _("TIFF: Error saving image.") ); + } return false; } - TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT); - TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, (uint32)image->GetWidth()); + const int imageWidth = image->GetWidth(); + TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, (uint32) imageWidth); TIFFSetField(tif, TIFFTAG_IMAGELENGTH, (uint32)image->GetHeight()); TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT); TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG); - if ( image->HasOption(wxIMAGE_OPTION_RESOLUTIONX) && - image->HasOption(wxIMAGE_OPTION_RESOLUTIONY) ) + // save the image resolution if we have it + int xres, yres; + const wxImageResolution res = GetResolutionFromOptions(*image, &xres, &yres); + uint16 tiffRes; + switch ( res ) + { + default: + wxFAIL_MSG( wxT("unknown image resolution units") ); + // fall through + + case wxIMAGE_RESOLUTION_NONE: + tiffRes = RESUNIT_NONE; + break; + + case wxIMAGE_RESOLUTION_INCHES: + tiffRes = RESUNIT_INCH; + break; + + case wxIMAGE_RESOLUTION_CM: + tiffRes = RESUNIT_CENTIMETER; + break; + } + + if ( tiffRes != RESUNIT_NONE ) { - TIFFSetField(tif, TIFFTAG_XRESOLUTION, - (float)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX)); - TIFFSetField(tif, TIFFTAG_YRESOLUTION, - (float)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY)); + TIFFSetField(tif, TIFFTAG_RESOLUTIONUNIT, tiffRes); + TIFFSetField(tif, TIFFTAG_XRESOLUTION, (float)xres); + TIFFSetField(tif, TIFFTAG_YRESOLUTION, (float)yres); } - int spp = image->GetOptionInt(wxIMAGE_OPTION_SAMPLESPERPIXEL); + + int spp = image->GetOptionInt(wxIMAGE_OPTION_TIFF_SAMPLESPERPIXEL); if ( !spp ) spp = 3; - int bpp = image->GetOptionInt(wxIMAGE_OPTION_BITSPERSAMPLE); - if ( !bpp ) - bpp=8; + int bps = image->GetOptionInt(wxIMAGE_OPTION_TIFF_BITSPERSAMPLE); + if ( !bps ) + { + bps = 8; + } + else if (bps == 1) + { + // One bit per sample combined with 3 samples per pixel is + // not allowed and crashes libtiff. + spp = 1; + } + + int photometric = PHOTOMETRIC_RGB; + + if ( image->HasOption(wxIMAGE_OPTION_TIFF_PHOTOMETRIC) ) + { + photometric = image->GetOptionInt(wxIMAGE_OPTION_TIFF_PHOTOMETRIC); + if (photometric == PHOTOMETRIC_MINISWHITE + || photometric == PHOTOMETRIC_MINISBLACK) + { + // either b/w or greyscale + spp = 1; + } + } + else if (spp <= 2) + { + photometric = PHOTOMETRIC_MINISWHITE; + } - int compression = image->GetOptionInt(wxIMAGE_OPTION_COMPRESSION); - if ( !compression ) + const bool hasAlpha = image->HasAlpha(); + + int compression = image->GetOptionInt(wxIMAGE_OPTION_TIFF_COMPRESSION); + if ( !compression || (compression == COMPRESSION_JPEG && hasAlpha) ) { - // we can't use COMPRESSION_LZW because current version of libtiff + // We can't use COMPRESSION_LZW because current version of libtiff // doesn't implement it ("no longer implemented due to Unisys patent // enforcement") and other compression methods are lossy so we - // shouldn't use them by default -- and the only remaining one is none + // shouldn't use them by default -- and the only remaining one is none. + // Also JPEG compression for alpha images is not a good idea (viewers + // not opening the image properly). compression = COMPRESSION_NONE; } - TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, spp); - TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bpp); - TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, spp*bpp == 1 ? PHOTOMETRIC_MINISBLACK - : PHOTOMETRIC_RGB); + if + ( + (photometric == PHOTOMETRIC_RGB && spp == 4) + || (photometric <= PHOTOMETRIC_MINISBLACK && spp == 2) + ) + { + // Compensate for user passing a SamplesPerPixel that includes + // the alpha channel. + spp--; + } + + + int extraSamples = hasAlpha ? 1 : 0; + + TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, spp + extraSamples); + TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps); + TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, photometric); TIFFSetField(tif, TIFFTAG_COMPRESSION, compression); - // scanlinesize if determined by spp and bpp - tsize_t linebytes = (tsize_t)image->GetWidth() * spp * bpp / 8; + if (extraSamples) + { + uint16 extra[] = { EXTRASAMPLE_UNSPECIFIED }; + TIFFSetField(tif, TIFFTAG_EXTRASAMPLES, (long) 1, &extra); + } - if ( (image->GetWidth() % 8 > 0) && (spp * bpp < 8) ) - linebytes+=1; + // scanlinesize is determined by spp+extraSamples and bps + const tsize_t linebytes = + (tsize_t)((imageWidth * (spp + extraSamples) * bps + 7) / 8); unsigned char *buf; - if (TIFFScanlineSize(tif) > linebytes || (spp * bpp < 24)) + const bool isColouredImage = (spp > 1) + && (photometric != PHOTOMETRIC_MINISWHITE) + && (photometric != PHOTOMETRIC_MINISBLACK); + + + if (TIFFScanlineSize(tif) > linebytes || !isColouredImage || hasAlpha) { buf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(tif)); if (!buf) { if (verbose) + { wxLogError( _("TIFF: Couldn't allocate memory.") ); + } TIFFClose( tif ); @@ -437,27 +761,84 @@ bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,TIFFDefaultStripSize(tif, (uint32) -1)); + const int bitsPerPixel = (spp + extraSamples) * bps; + const int bytesPerPixel = (bitsPerPixel + 7) / 8; + const int pixelsPerByte = 8 / bitsPerPixel; + int remainingPixelCount = 0; + + if (pixelsPerByte) + { + // How many pixels to write in the last byte column? + remainingPixelCount = imageWidth % pixelsPerByte; + if (!remainingPixelCount) remainingPixelCount = pixelsPerByte; + } + + const bool minIsWhite = (photometric == PHOTOMETRIC_MINISWHITE); unsigned char *ptr = image->GetData(); for ( int row = 0; row < image->GetHeight(); row++ ) { if ( buf ) { - if ( spp * bpp > 1 ) + if (isColouredImage) { - // color image - memcpy(buf, ptr, image->GetWidth()); + // colour image + if (hasAlpha) + { + for ( int column = 0; column < imageWidth; column++ ) + { + buf[column*4 ] = ptr[column*3 ]; + buf[column*4 + 1] = ptr[column*3 + 1]; + buf[column*4 + 2] = ptr[column*3 + 2]; + buf[column*4 + 3] = image->GetAlpha(column, row); + } + } + else + { + memcpy(buf, ptr, imageWidth * 3); + } + } + else if (spp * bps == 8) // greyscale image + { + for ( int column = 0; column < imageWidth; column++ ) + { + uint8 value = ptr[column*3 + 1]; + if (minIsWhite) + { + value = 255 - value; + } + + buf[column * bytesPerPixel] = value; + + if (hasAlpha) + { + value = image->GetAlpha(column, row); + buf[column*bytesPerPixel+1] + = minIsWhite ? 255 - value : value; + } + } } else // black and white image { for ( int column = 0; column < linebytes; column++ ) { uint8 reverse = 0; - for ( int bp = 0; bp < 8; bp++ ) + int pixelsPerByteCount = (column + 1 != linebytes) + ? pixelsPerByte + : remainingPixelCount; + for ( int bp = 0; bp < pixelsPerByteCount; bp++ ) { - if ( ptr[column*24 + bp*3] > 0 ) + if ( (ptr[column * 3 * pixelsPerByte + bp*3 + 1] <=127) + == minIsWhite ) { - // check only red as this is sufficient - reverse = (uint8)(reverse | 128 >> bp); + // check only green as this is sufficient + reverse |= (uint8) (128 >> (bp * bitsPerPixel)); + } + + if (hasAlpha + && (image->GetAlpha(column * pixelsPerByte + bp, + row) <= 127) == minIsWhite) + { + reverse |= (uint8) (64 >> (bp * bitsPerPixel)); } } @@ -469,7 +850,9 @@ bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo if ( TIFFWriteScanline(tif, buf ? buf : ptr, (uint32)row, 0) < 0 ) { if (verbose) + { wxLogError( _("TIFF: Error writing image.") ); + } TIFFClose( tif ); if (buf) @@ -478,7 +861,7 @@ bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo return false; } - ptr += image->GetWidth()*3; + ptr += imageWidth * 3; } (void) TIFFClose(tif); @@ -493,7 +876,7 @@ bool wxTIFFHandler::DoCanRead( wxInputStream& stream ) { unsigned char hdr[2]; - if ( !stream.Read(&hdr[0], WXSIZEOF(hdr)) ) + if ( !stream.Read(&hdr[0], WXSIZEOF(hdr)) ) // it's ok to modify the stream position here return false; return (hdr[0] == 'I' && hdr[1] == 'I') || @@ -502,4 +885,27 @@ bool wxTIFFHandler::DoCanRead( wxInputStream& stream ) #endif // wxUSE_STREAMS +/*static*/ wxVersionInfo wxTIFFHandler::GetLibraryVersionInfo() +{ + int major, + minor, + micro; + + const wxString ver(::TIFFGetVersion()); + if ( wxSscanf(ver, "LIBTIFF, Version %d.%d.%d", &major, &minor, µ) != 3 ) + { + wxLogDebug("Unrecognized libtiff version string \"%s\"", ver); + + major = + minor = + micro = 0; + } + + wxString copyright; + const wxString desc = ver.BeforeFirst('\n', ©right); + copyright.Replace("\n", ""); + + return wxVersionInfo("libtiff", major, minor, micro, desc, copyright); +} + #endif // wxUSE_LIBTIFF