X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/ff7c6c9c36b1501707625fea6c5acd3576cc54ca..08670ea85abf4b4946a9ce64971b591d7b1ee30b:/src/common/imagtiff.cpp diff --git a/src/common/imagtiff.cpp b/src/common/imagtiff.cpp index 4fb132a42d..3dccff9618 100644 --- a/src/common/imagtiff.cpp +++ b/src/common/imagtiff.cpp @@ -1,5 +1,5 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: imagtiff.cpp +// Name: src/common/imagtiff.cpp // Purpose: wxImage TIFF handler // Author: Robert Roebling // RCS-ID: $Id$ @@ -7,36 +7,97 @@ // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// -#ifdef __GNUG__ -#pragma implementation "imagtiff.h" -#endif +// ============================================================================ +// declarations +// ============================================================================ + +// ---------------------------------------------------------------------------- +// headers +// ---------------------------------------------------------------------------- // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" #ifdef __BORLANDC__ -#pragma hdrstop + #pragma hdrstop #endif -#include "wx/defs.h" - -#if wxUSE_LIBTIFF +#if wxUSE_IMAGE && wxUSE_LIBTIFF #include "wx/imagtiff.h" -#include "wx/bitmap.h" -#include "wx/debug.h" -#include "wx/log.h" -#include "wx/app.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 + extern "C" { +#ifdef __DMC__ + #include "tif_config.h" +#endif #include "tiff.h" #include "tiffio.h" - #include "tiffiop.h" } #include "wx/filefn.h" #include "wx/wfstream.h" -#include "wx/intl.h" -#include "wx/module.h" + +#ifndef TIFFLINKAGEMODE + #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 @@ -44,84 +105,199 @@ extern "C" IMPLEMENT_DYNAMIC_CLASS(wxTIFFHandler,wxImageHandler) -static tsize_t -_tiffReadProc(thandle_t handle, tdata_t buf, tsize_t size) +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 +// bit, toff_t +static toff_t wxFileOffsetToTIFF(wxFileOffset ofs) +{ + if ( ofs == wxInvalidOffset ) + return (toff_t)-1; + + toff_t tofs = wx_truncate_cast(toff_t, ofs); + wxCHECK_MSG( (wxFileOffset)tofs == ofs, (toff_t)-1, + wxT("TIFF library doesn't support large files") ); + + return tofs; +} + +// another helper to convert standard seek mode to our +static wxSeekMode wxSeekModeFromTIFF(int whence) +{ + switch ( whence ) + { + case SEEK_SET: + return wxFromStart; + + case SEEK_CUR: + return wxFromCurrent; + + case SEEK_END: + return wxFromEnd; + + default: + return wxFromCurrent; + } +} + +extern "C" +{ + +tsize_t TIFFLINKAGEMODE +wxTIFFNullProc(thandle_t WXUNUSED(handle), + tdata_t WXUNUSED(buf), + tsize_t WXUNUSED(size)) +{ + return (tsize_t) -1; +} + +tsize_t TIFFLINKAGEMODE +wxTIFFReadProc(thandle_t handle, tdata_t buf, tsize_t size) { wxInputStream *stream = (wxInputStream*) handle; stream->Read( (void*) buf, (size_t) size ); - return stream->LastRead(); + return wx_truncate_cast(tsize_t, stream->LastRead()); } -static tsize_t -_tiffWriteProc(thandle_t handle, tdata_t buf, tsize_t size) +tsize_t TIFFLINKAGEMODE +wxTIFFWriteProc(thandle_t handle, tdata_t buf, tsize_t size) { wxOutputStream *stream = (wxOutputStream*) handle; stream->Write( (void*) buf, (size_t) size ); - return stream->LastWrite(); + return wx_truncate_cast(tsize_t, stream->LastWrite()); } -static toff_t -_tiffSeekProc(thandle_t handle, toff_t off, int whence) +toff_t TIFFLINKAGEMODE +wxTIFFSeekIProc(thandle_t handle, toff_t off, int whence) { wxInputStream *stream = (wxInputStream*) handle; - wxSeekMode mode; - switch (whence) + + return wxFileOffsetToTIFF(stream->SeekI((wxFileOffset)off, + wxSeekModeFromTIFF(whence))); +} + +toff_t TIFFLINKAGEMODE +wxTIFFSeekOProc(thandle_t handle, toff_t off, int whence) +{ + wxOutputStream *stream = (wxOutputStream*) handle; + + toff_t offset = wxFileOffsetToTIFF( + stream->SeekO((wxFileOffset)off, wxSeekModeFromTIFF(whence)) ); + + if (offset != (toff_t) -1 || whence != SEEK_SET) { - case SEEK_SET: mode = wxFromStart; break; - case SEEK_CUR: mode = wxFromCurrent; break; - case SEEK_END: mode = wxFromEnd; break; - default: mode = wxFromCurrent; break; + return offset; } - return (toff_t)stream->SeekI( (off_t)off, mode ); + + /* + 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() ); } -static int -_tiffCloseProc(thandle_t WXUNUSED(handle)) +int TIFFLINKAGEMODE +wxTIFFCloseIProc(thandle_t WXUNUSED(handle)) { - return 0; // ? + // there is no need to close the input stream + return 0; } -static toff_t -_tiffSizeProc(thandle_t handle) +int TIFFLINKAGEMODE +wxTIFFCloseOProc(thandle_t handle) { - wxInputStream *stream = (wxInputStream*) handle; + wxOutputStream *stream = (wxOutputStream*) handle; + + return stream->Close() ? 0 : -1; +} + +toff_t TIFFLINKAGEMODE +wxTIFFSizeProc(thandle_t handle) +{ + wxStreamBase *stream = (wxStreamBase*) handle; return (toff_t) stream->GetSize(); } -static int -_tiffMapProc(thandle_t WXUNUSED(handle), +int TIFFLINKAGEMODE +wxTIFFMapProc(thandle_t WXUNUSED(handle), tdata_t* WXUNUSED(pbase), toff_t* WXUNUSED(psize)) { return 0; } -static void -_tiffUnmapProc(thandle_t WXUNUSED(handle), +void TIFFLINKAGEMODE +wxTIFFUnmapProc(thandle_t WXUNUSED(handle), tdata_t WXUNUSED(base), toff_t WXUNUSED(size)) { } +} // extern "C" + TIFF* TIFFwxOpen(wxInputStream &stream, const char* name, const char* mode) { TIFF* tif = TIFFClientOpen(name, mode, (thandle_t) &stream, - _tiffReadProc, _tiffWriteProc, - _tiffSeekProc, _tiffCloseProc, _tiffSizeProc, - _tiffMapProc, _tiffUnmapProc); - - if (tif) - tif->tif_fd = (int) &stream; + wxTIFFReadProc, wxTIFFNullProc, + wxTIFFSeekIProc, wxTIFFCloseIProc, wxTIFFSizeProc, + wxTIFFMapProc, wxTIFFUnmapProc); return tif; } +TIFF* +TIFFwxOpen(wxOutputStream &stream, const char* name, const char* mode) +{ + TIFF* tif = TIFFClientOpen(name, mode, + (thandle_t) &stream, + wxTIFFNullProc, wxTIFFWriteProc, + wxTIFFSeekOProc, wxTIFFCloseOProc, wxTIFFSizeProc, + wxTIFFMapProc, wxTIFFUnmapProc); + + return tif; +} bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int index ) { + if (index == -1) + index = 0; + image->Destroy(); TIFF *tif = TIFFwxOpen( stream, "image", "r" ); @@ -129,107 +305,287 @@ bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos if (!tif) { if (verbose) + { wxLogError( _("TIFF: Error loading image.") ); + } - return FALSE; + return false; } if (!TIFFSetDirectory( tif, (tdir_t)index )) { if (verbose) + { wxLogError( _("Invalid TIFF image index.") ); + } TIFFClose( tif ); - return FALSE; + return false; } 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); - raster = (uint32*) _TIFFmalloc( npixels * sizeof(uint32) ); + 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.") ); + } + + TIFFClose(tif); + + return false; + } + + raster = (uint32*) _TIFFmalloc( (uint32)bytesNeeded ); if (!raster) { if (verbose) + { wxLogError( _("TIFF: Couldn't allocate memory.") ); + } - return FALSE; + TIFFClose( tif ); + + return false; } image->Create( (int)w, (int)h ); - if (!image->Ok()) + if (!image->IsOk()) { if (verbose) + { wxLogError( _("TIFF: Couldn't allocate memory.") ); + } _TIFFfree( raster ); + TIFFClose( tif ); - return FALSE; + 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(); + TIFFClose( tif ); - return FALSE; + 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; + return true; } -int wxTIFFHandler::GetImageCount( wxInputStream& stream ) +int wxTIFFHandler::DoGetImageCount( wxInputStream& stream ) { TIFF *tif = TIFFwxOpen( stream, "image", "r" ); @@ -243,31 +599,313 @@ int wxTIFFHandler::GetImageCount( wxInputStream& stream ) TIFFClose( tif ); + // NOTE: this function modifies the current stream position but it's ok + // (see wxImageHandler::GetImageCount) + return dircount; } -bool wxTIFFHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) ) +bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose ) { - return FALSE; + TIFF *tif = TIFFwxOpen( stream, "image", "w" ); + + if (!tif) + { + if (verbose) + { + wxLogError( _("TIFF: Error saving image.") ); + } + + return false; + } + + 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); + + // 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_RESOLUTIONUNIT, tiffRes); + TIFFSetField(tif, TIFFTAG_XRESOLUTION, (float)xres); + TIFFSetField(tif, TIFFTAG_YRESOLUTION, (float)yres); + } + + + int spp = image->GetOptionInt(wxIMAGE_OPTION_TIFF_SAMPLESPERPIXEL); + if ( !spp ) + spp = 3; + + 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; + } + + 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 + // 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. + // Also JPEG compression for alpha images is not a good idea (viewers + // not opening the image properly). + compression = COMPRESSION_NONE; + } + + 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); + + if (extraSamples) + { + uint16 extra[] = { EXTRASAMPLE_UNSPECIFIED }; + TIFFSetField(tif, TIFFTAG_EXTRASAMPLES, (long) 1, &extra); + } + + // scanlinesize is determined by spp+extraSamples and bps + const tsize_t linebytes = + (tsize_t)((imageWidth * (spp + extraSamples) * bps + 7) / 8); + + unsigned char *buf; + + 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 ); + + return false; + } + } + else + { + buf = NULL; + } + + 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 (isColouredImage) + { + // 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; + int pixelsPerByteCount = (column + 1 != linebytes) + ? pixelsPerByte + : remainingPixelCount; + for ( int bp = 0; bp < pixelsPerByteCount; bp++ ) + { + if ( (ptr[column * 3 * pixelsPerByte + bp*3 + 1] <=127) + == minIsWhite ) + { + // 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)); + } + } + + buf[column] = reverse; + } + } + } + + if ( TIFFWriteScanline(tif, buf ? buf : ptr, (uint32)row, 0) < 0 ) + { + if (verbose) + { + wxLogError( _("TIFF: Error writing image.") ); + } + + TIFFClose( tif ); + if (buf) + _TIFFfree(buf); + + return false; + } + + ptr += imageWidth * 3; + } + + (void) TIFFClose(tif); + + if (buf) + _TIFFfree(buf); + + return true; } bool wxTIFFHandler::DoCanRead( wxInputStream& stream ) { unsigned char hdr[2]; - stream.Read(&hdr, 2); - stream.SeekI(-2, wxFromCurrent); + if ( !stream.Read(&hdr[0], WXSIZEOF(hdr)) ) // it's ok to modify the stream position here + return false; - return ((hdr[0] == 0x49 && hdr[1] == 0x49) || - (hdr[0] == 0x4D && hdr[1] == 0x4D)); + return (hdr[0] == 'I' && hdr[1] == 'I') || + (hdr[0] == 'M' && hdr[1] == 'M'); } +#endif // wxUSE_STREAMS -#endif - // wxUSE_LIBTIFF - +/*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