103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
// include/ReadTiffFile.hh
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// This file is part of libpbe; see http://svn.chezphil.org/libpbe/
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// (C) 2009 Philip Endecott
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#ifndef libpbe_ReadTiffFile_hh
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#define libpbe_ReadTiffFile_hh
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#include <tiffio.h>
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#include <boost/noncopyable.hpp>
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#include <stdint.h>
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// ReadTiffFile is a wrapper around libtiff's facilities for reading
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// a TIFF file. The ctor takes a filename; you can then access properties
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// such as the dimensions of the image.
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//
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// libtiff provides various methods to access the pixel data, some of
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// which work with all files and others work with files with particular
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// organisations [tiff allows data to be in raster order or tiled, with
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// the colour channels packed or separate, etc]. This wrapper currently
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// only supports reading in "ARGB strips", i.e. the colours are decoded
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// to 32-bits-per-pixel and the data is in strips the full width of the
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// image and some some number of pixels (possibly 1) high.
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//
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// Boost.GIL also has a libtiff wrapper, but I believe that it only
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// supports reading whole images.
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namespace pbe {
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struct ReadTiffFile: boost::noncopyable {
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TIFF* const tiff;
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ReadTiffFile(const char* fn):
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tiff(TIFFOpen(fn,"r"))
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{
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if (!tiff) {
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throw "TIFFOpen() failed";
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}
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}
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~ReadTiffFile() {
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TIFFClose(tiff);
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}
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uint32_t width() const {
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uint32_t w;
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int r = TIFFGetField(tiff,TIFFTAG_IMAGEWIDTH,&w);
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if (r==0) {
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throw "TIFFGetField(TIFFTAG_IMAGEWIDTH); failed";
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}
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return w;
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}
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uint32_t height() const {
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uint32_t h;
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int r = TIFFGetField(tiff,TIFFTAG_IMAGELENGTH,&h);
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if (r==0) {
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throw "TIFFGetField(TIFFTAG_IMAGLENGTH); failed";
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}
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return h;
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}
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uint32_t rows_per_strip() const {
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uint32_t n;
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int r = TIFFGetField(tiff,TIFFTAG_ROWSPERSTRIP,&n);
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if (r==0) {
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throw "TIFFGetField(TIFFTAG_ROWSPERSTRIP); failed";
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}
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return n;
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}
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size_t number_of_strips() const {
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return TIFFNumberOfStrips(tiff);
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}
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void read_rgba_strip(uint32_t row, uint32_t* data) const {
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int r = TIFFReadRGBAStrip(tiff,row,data);
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if (r==0) {
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throw "TIFFReadRGBAStrip failed";
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}
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}
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};
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};
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#endif
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