// Name: src/common/imagtiff.cpp
// Purpose: wxImage TIFF handler
// Author: Robert Roebling
-// RCS-ID: $Id$
// Copyright: (c) Robert Roebling
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#include "wx/wfstream.h"
#ifndef TIFFLINKAGEMODE
- #if defined(__WATCOMC__) && defined(__WXMGL__)
- #define TIFFLINKAGEMODE cdecl
- #else
- #define TIFFLINKAGEMODE LINKAGEMODE
- #endif
+ #define TIFFLINKAGEMODE LINKAGEMODE
#endif
// ============================================================================
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 samplesPerPixel = 0;
+ (void) TIFFGetFieldDefaulted(tif, TIFFTAG_SAMPLESPERPIXEL, &samplesPerPixel);
+
+ uint16 bitsPerSample = 0;
+ (void) TIFFGetFieldDefaulted(tif, TIFFTAG_BITSPERSAMPLE, &bitsPerSample);
+
uint16 extraSamples;
uint16* samplesInfo;
- TIFFGetFieldDefaulted(tif, TIFFTAG_SAMPLESPERPIXEL, &samplesPerPixel);
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 && samplesPerPixel > 3)
+ && ((samplesInfo[0] == EXTRASAMPLE_UNSPECIFIED)
|| samplesInfo[0] == EXTRASAMPLE_ASSOCALPHA
|| samplesInfo[0] == EXTRASAMPLE_UNASSALPHA))
|| (extraSamples == 0 && samplesPerPixel == 4
if ( hasAlpha )
image->SetAlpha();
- if (!TIFFReadRGBAImage( tif, w, h, raster, 0 ))
+ 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)
{
}
unsigned char *ptr = image->GetData();
- ptr += w*3*(h-1);
- unsigned char *alpha = hasAlpha ? image->GetAlpha() : NULL;
- if ( hasAlpha )
- alpha += w*(h-1);
+ unsigned char *alpha = image->GetAlpha();
uint32 pos = 0;
pos++;
}
-
- // subtract line we just added plus one line:
- ptr -= 2*w*3;
- if ( hasAlpha )
- alpha -= 2*w;
}
- uint16 spp, bpp, compression;
+ image->SetOption(wxIMAGE_OPTION_TIFF_PHOTOMETRIC, photometric);
+
+ uint16 compression;
/*
- Read some baseline TIFF tags which helps when re-saving a TIFF
+ Copy some baseline TIFF tags which helps when re-saving a TIFF
to be similar to the original image.
*/
- if ( TIFFGetFieldDefaulted(tif, TIFFTAG_SAMPLESPERPIXEL, &spp) )
+ if (samplesPerPixel)
{
- image->SetOption(wxIMAGE_OPTION_SAMPLESPERPIXEL, spp);
+ image->SetOption(wxIMAGE_OPTION_TIFF_SAMPLESPERPIXEL, samplesPerPixel);
}
- if ( TIFFGetFieldDefaulted(tif, TIFFTAG_BITSPERSAMPLE, &bpp) )
+ if (bitsPerSample)
{
- image->SetOption(wxIMAGE_OPTION_BITSPERSAMPLE, bpp);
+ image->SetOption(wxIMAGE_OPTION_TIFF_BITSPERSAMPLE, bitsPerSample);
}
if ( TIFFGetFieldDefaulted(tif, TIFFTAG_COMPRESSION, &compression) )
{
- image->SetOption(wxIMAGE_OPTION_COMPRESSION, compression);
+ image->SetOption(wxIMAGE_OPTION_TIFF_COMPRESSION, compression);
}
// Set the resolution unit.
/*
Set the image resolution if it's available. Resolution tag is not
- dependant on RESOLUTIONUNIT != RESUNIT_NONE (according to TIFF spec).
+ dependent on RESOLUTIONUNIT != RESUNIT_NONE (according to TIFF spec).
*/
float resX, resY;
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);
}
- 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;
+ }
+
+ const bool hasAlpha = image->HasAlpha();
- int compression = image->GetOptionInt(wxIMAGE_OPTION_COMPRESSION);
- if ( !compression )
+ 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)
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 green as this is sufficient
+ reverse |= (uint8) (128 >> (bp * bitsPerPixel));
+ }
+
+ if (hasAlpha
+ && (image->GetAlpha(column * pixelsPerByte + bp,
+ row) <= 127) == minIsWhite)
{
- // check only red as this is sufficient
- reverse = (uint8)(reverse | 128 >> bp);
+ reverse |= (uint8) (64 >> (bp * bitsPerPixel));
}
}
return false;
}
- ptr += image->GetWidth()*3;
+ ptr += imageWidth * 3;
}
(void) TIFFClose(tif);
projects / wxWidgets.git / blobdiff