32 lines
1.2 KiB
Plaintext
32 lines
1.2 KiB
Plaintext
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Frank,
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I attached a file that uses RGBA interface (tif_getimage.c) to read a tiff
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file and convert to a DIB. It's advantage is that it is easy to read *any*
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tiff file suported by libtiff and easily convert it to a DIB. The disadvantage
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is that bilevel (B&W) bitmaps (and all other non-rgba images) are also
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converted to RGBA, thus taking up 32x as much memory as needed (4 bytes per
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pixel, rather than 1 bit). I read tiff files, but don't need to
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write them. And my files are typically small, so the overhead is mostly
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inconsequential. But for bilevel images, I overrode the get() and put()
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routines of the RGBA interface to just copy the data from the input raster
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to the output raster, rather than expanding out to full 32 bit format. It
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would be nice if there were a simple way to handle all palletized images,
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but that would take more custom routines, and it's not that important to me.
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Usage:
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m_pDIB = (PBITMAPINFOHEADER)::ReadTIFF(pathName);
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if (m_pDIB != 0) {
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m_format = IMAGETYPE_TIF;
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}
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This is intended as Win32, but the modifications for new get() and put()
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routines may be independent of platform.
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Thanks for your work supporting the forum and the library!
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Regards,
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Mark James
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mark@james.net
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