#if wxUSE_IMAGE && wxUSE_LIBTIFF
#include "wx/imagtiff.h"
+#include "wx/versioninfo.h"
#ifndef WX_PRECOMP
#include "wx/log.h"
m_name = wxT("TIFF file");
m_extension = wxT("tif");
m_altExtensions.Add(wxT("tiff"));
- m_type = wxBITMAP_TYPE_TIF;
+ m_type = wxBITMAP_TYPE_TIFF;
m_mime = wxT("image/tiff");
TIFFSetWarningHandler((TIFFErrorHandler) TIFFwxWarningHandler);
TIFFSetErrorHandler((TIFFErrorHandler) TIFFwxErrorHandler);
{
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
TIFFGetField( tif, TIFFTAG_IMAGEWIDTH, &w );
TIFFGetField( tif, TIFFTAG_IMAGELENGTH, &h );
+ uint16 photometric;
+ uint16 samplesPerPixel;
uint16 extraSamples;
uint16* samplesInfo;
+ TIFFGetFieldDefaulted(tif, TIFFTAG_SAMPLESPERPIXEL, &samplesPerPixel);
TIFFGetFieldDefaulted(tif, TIFFTAG_EXTRASAMPLES,
&extraSamples, &samplesInfo);
- const bool hasAlpha = (extraSamples == 1 &&
- (samplesInfo[0] == EXTRASAMPLE_ASSOCALPHA ||
- samplesInfo[0] == EXTRASAMPLE_UNASSALPHA));
+ if (!TIFFGetField(tif, TIFFTAG_PHOTOMETRIC, &photometric))
+ {
+ photometric = PHOTOMETRIC_MINISWHITE;
+ }
+ const bool hasAlpha = (extraSamples >= 1
+ && ((samplesInfo[0] == EXTRASAMPLE_UNSPECIFIED && samplesPerPixel > 3)
+ || 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
}
image->Create( (int)w, (int)h );
- if (!image->Ok())
+ if (!image->IsOk())
{
if (verbose)
{
alpha -= 2*w;
}
- // set the image resolution if it's available
+
+ image->SetOption(wxIMAGE_OPTION_TIFF_PHOTOMETRIC, photometric);
+
+ uint16 spp, bps, compression;
+ /*
+ Read some baseline TIFF tags which helps when re-saving a TIFF
+ to be similar to the original image.
+ */
+ if ( TIFFGetFieldDefaulted(tif, TIFFTAG_SAMPLESPERPIXEL, &spp) )
+ {
+ image->SetOption(wxIMAGE_OPTION_TIFF_SAMPLESPERPIXEL, spp);
+ }
+
+ if ( TIFFGetFieldDefaulted(tif, TIFFTAG_BITSPERSAMPLE, &bps) )
+ {
+ image->SetOption(wxIMAGE_OPTION_TIFF_BITSPERSAMPLE, bps);
+ }
+
+ 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 ( TIFFGetField(tif, TIFFTAG_RESOLUTIONUNIT, &tiffRes) )
+ if ( TIFFGetFieldDefaulted(tif, TIFFTAG_RESOLUTIONUNIT, &tiffRes) )
{
- wxImageResolution res;
- switch ( tiffRes )
+ switch (tiffRes)
{
default:
wxLogWarning(_("Unknown TIFF resolution unit %d ignored"),
- tiffRes);
+ tiffRes);
// fall through
case RESUNIT_NONE:
- res = wxIMAGE_RESOLUTION_NONE;
+ resUnit = wxIMAGE_RESOLUTION_NONE;
break;
case RESUNIT_INCH:
- res = wxIMAGE_RESOLUTION_INCHES;
+ resUnit = wxIMAGE_RESOLUTION_INCHES;
break;
case RESUNIT_CENTIMETER:
- res = wxIMAGE_RESOLUTION_CM;
+ resUnit = wxIMAGE_RESOLUTION_CM;
break;
}
+ }
- if ( res != wxIMAGE_RESOLUTION_NONE )
- {
- float xres, yres;
- if ( TIFFGetField(tif, TIFFTAG_XRESOLUTION, &xres) )
- image->SetOption(wxIMAGE_OPTION_RESOLUTIONX, wxRound(xres));
+ image->SetOption(wxIMAGE_OPTION_RESOLUTIONUNIT, resUnit);
- if ( TIFFGetField(tif, TIFFTAG_YRESOLUTION, &yres) )
- image->SetOption(wxIMAGE_OPTION_RESOLUTIONY, wxRound(yres));
- }
+ /*
+ 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 );
} while (TIFFReadDirectory(tif));
TIFFClose( tif );
-
+
// NOTE: this function modifies the current stream position but it's ok
// (see wxImageHandler::GetImageCount)
}
- 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 == 1)
+ {
+ photometric = PHOTOMETRIC_MINISWHITE;
+ }
+
+ const bool isColouredImage = (spp > 1)
+ && (photometric != PHOTOMETRIC_MINISWHITE)
+ && (photometric != PHOTOMETRIC_MINISBLACK);
- int compression = image->GetOptionInt(wxIMAGE_OPTION_COMPRESSION);
+ int compression = image->GetOptionInt(wxIMAGE_OPTION_TIFF_COMPRESSION);
if ( !compression )
{
// we can't use COMPRESSION_LZW because current version of libtiff
}
TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, spp);
- TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bpp);
- TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, spp*bpp == 1 ? PHOTOMETRIC_MINISBLACK
- : PHOTOMETRIC_RGB);
+ 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;
+ // scanlinesize if determined by spp and bps
+ tsize_t linebytes = (tsize_t)image->GetWidth() * spp * bps / 8;
- if ( (image->GetWidth() % 8 > 0) && (spp * bpp < 8) )
+ if ( (image->GetWidth() % 8 > 0) && (spp * bps < 8) )
linebytes+=1;
unsigned char *buf;
- if (TIFFScanlineSize(tif) > linebytes || (spp * bpp < 24))
+ if (TIFFScanlineSize(tif) > linebytes || !isColouredImage)
{
buf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(tif));
if (!buf)
TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,TIFFDefaultStripSize(tif, (uint32) -1));
+ 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());
}
+ else if (spp * bps == 8) // greyscale image
+ {
+ for ( int column = 0; column < linebytes; column++ )
+ {
+ uint8 value = ptr[column*3 + 1];
+ if (minIsWhite)
+ {
+ value = 255 - value;
+ }
+
+ buf[column] = value;
+ }
+ }
else // black and white image
{
for ( int column = 0; column < linebytes; column++ )
uint8 reverse = 0;
for ( int bp = 0; bp < 8; bp++ )
{
- if ( ptr[column*24 + bp*3] > 0 )
+ if ( (ptr[column*24 + bp*3 + 1] <=127) == minIsWhite )
{
- // check only red as this is sufficient
+ // check only green as this is sufficient
reverse = (uint8)(reverse | 128 >> bp);
}
}
#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
projects / wxWidgets.git / blobdiff