338 lines
8.4 KiB
C
338 lines
8.4 KiB
C
/*
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* tumble: build a PDF file from image files
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*
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* Copyright 2001, 2002, 2003, 2017 Eric Smith <spacewar@gmail.com>
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*
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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 version 2 as
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* published by the Free Software Foundation. Note that permission is
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* not granted to redistribute this program under the terms of any
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* other version of the General Public License.
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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 USA
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*
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* 2010-09-02 [JDB] Added support for min-is-black TIFF images.
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <strings.h> /* strcasecmp() is a BSDism */
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#include <tiffio.h>
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/*
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* On the x86, libtiff defaults to bit-endian bit order for no good reason.
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* In theory, the '-L' (and maybe '-H') should give us little-endian bit
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* order, but it doesn't seem to work. Thus we reverse the bits ourselves
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* after we read in the file.
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*/
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#define TIFF_REVERSE_BITS
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#include "semantics.h"
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#include "tumble.h"
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#include "bitblt.h"
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#include "pdf.h"
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#include "tumble_input.h"
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TIFF *tiff_in;
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#define SWAP(type,a,b) do { type temp; temp = a; a = b; b = temp; } while (0)
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static bool match_tiff_suffix (char *suffix)
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{
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return ((strcasecmp (suffix, ".tif") == 0) ||
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(strcasecmp (suffix, ".tiff") == 0));
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}
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static bool close_tiff_input_file (void)
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{
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TIFFClose (tiff_in);
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return (1);
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}
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static bool open_tiff_input_file (FILE *f, char *name)
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{
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uint8_t buf [2];
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size_t l;
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l = fread (& buf [0], 1, sizeof (buf), f);
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if (l != sizeof (buf))
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return (0);
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rewind (f);
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if (! (((buf [0] == 0x49) && (buf [1] == 0x49)) ||
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((buf [0] == 0x4d) && (buf [1] == 0x4d))))
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return (0);
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tiff_in = TIFFFdOpen (fileno (f), name, "r");
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if (! tiff_in)
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{
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fprintf (stderr, "can't open input file '%s'\n", name);
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return (0);
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}
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return (1);
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}
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static bool last_tiff_input_page (void)
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{
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return (TIFFLastDirectory (tiff_in));
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}
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static bool get_tiff_image_info (int image,
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input_attributes_t input_attributes,
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image_info_t *image_info)
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{
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uint32_t image_height, image_width;
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uint16_t samples_per_pixel;
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uint16_t bits_per_sample;
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uint16_t photometric_interpretation;
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uint16_t planar_config;
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uint16_t resolution_unit;
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float x_resolution, y_resolution;
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double dest_x_resolution, dest_y_resolution;
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#ifdef CHECK_DEPTH
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uint32_t image_depth;
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#endif
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if (! TIFFSetDirectory (tiff_in, image - 1))
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{
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fprintf (stderr, "can't find page %d of input file\n", image);
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return (0);
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}
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if (1 != TIFFGetField (tiff_in, TIFFTAG_IMAGELENGTH, & image_height))
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{
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fprintf (stderr, "can't get image height\n");
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return (0);
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}
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if (1 != TIFFGetField (tiff_in, TIFFTAG_IMAGEWIDTH, & image_width))
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{
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fprintf (stderr, "can't get image width\n");
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return (0);
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}
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if (1 != TIFFGetField (tiff_in, TIFFTAG_SAMPLESPERPIXEL, & samples_per_pixel))
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{
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fprintf (stderr, "can't get samples per pixel\n");
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return (0);
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}
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#ifdef CHECK_DEPTH
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if (1 != TIFFGetField (tiff_in, TIFFTAG_IMAGEDEPTH, & image_depth))
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{
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fprintf (stderr, "can't get image depth\n");
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return (0);
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}
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#endif
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if (1 != TIFFGetField (tiff_in, TIFFTAG_BITSPERSAMPLE, & bits_per_sample))
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{
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fprintf (stderr, "can't get bits per sample\n");
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return (0);
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}
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if (1 != TIFFGetField (tiff_in, TIFFTAG_PHOTOMETRIC, & photometric_interpretation))
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{
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fprintf(stderr, "warning: photometric interpretation not specified, assuming min-is-white\n");
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photometric_interpretation = PHOTOMETRIC_MINISWHITE;
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}
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else if ((photometric_interpretation != PHOTOMETRIC_MINISWHITE) &&
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(photometric_interpretation != PHOTOMETRIC_MINISBLACK))
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{
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fprintf(stderr, "photometric interpretation value %u is invalid\n", photometric_interpretation);
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return (0);
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}
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if (1 != TIFFGetField (tiff_in, TIFFTAG_PLANARCONFIG, & planar_config))
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planar_config = 1;
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if (1 != TIFFGetField (tiff_in, TIFFTAG_RESOLUTIONUNIT, & resolution_unit))
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resolution_unit = 2;
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if (1 != TIFFGetField (tiff_in, TIFFTAG_XRESOLUTION, & x_resolution))
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x_resolution = 300;
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if (1 != TIFFGetField (tiff_in, TIFFTAG_YRESOLUTION, & y_resolution))
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y_resolution = 300;
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if (samples_per_pixel != 1)
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{
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fprintf (stderr, "samples per pixel %u, must be 1\n", samples_per_pixel);
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return (0);
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}
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#ifdef CHECK_DEPTH
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if (image_depth != 1)
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{
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fprintf (stderr, "image depth %u, must be 1\n", image_depth);
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return (0);
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}
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#endif
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if (bits_per_sample != 1)
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{
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fprintf (stderr, "bits per sample %u, must be 1\n", bits_per_sample);
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return (0);
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}
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if (planar_config != 1)
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{
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fprintf (stderr, "planar config %u, must be 1\n", planar_config);
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return (0);
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}
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if (input_attributes.has_resolution)
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{
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x_resolution = input_attributes.x_resolution;
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y_resolution = input_attributes.y_resolution;
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}
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if ((input_attributes.rotation == 90) || (input_attributes.rotation == 270))
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{
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image_info->width_samples = image_height;
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image_info->height_samples = image_width;
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dest_x_resolution = y_resolution;
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dest_y_resolution = x_resolution;
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SWAP (double, image_info->width_points, image_info->height_points);
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}
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else
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{
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image_info->width_samples = image_width;
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image_info->height_samples = image_height;
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dest_x_resolution = x_resolution;
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dest_y_resolution = y_resolution;
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}
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image_info->width_points = (image_info->width_samples / dest_x_resolution) * POINTS_PER_INCH;
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image_info->height_points = (image_info->height_samples / dest_y_resolution) * POINTS_PER_INCH;
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if ((image_info->height_points > PAGE_MAX_POINTS) ||
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(image_info->width_points > PAGE_MAX_POINTS))
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{
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fprintf (stdout, "image too large (max %d inches on a side\n", PAGE_MAX_INCHES);
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return (0);
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}
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image_info->negative = (photometric_interpretation == PHOTOMETRIC_MINISBLACK);
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return (1);
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}
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static bool process_tiff_image (int image, /* range 1 .. n */
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input_attributes_t input_attributes,
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image_info_t *image_info,
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pdf_page_handle page,
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position_t position)
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{
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bool result = 0;
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Rect rect;
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Bitmap *bitmap = NULL;
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int row;
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rect.min.x = 0;
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rect.min.y = 0;
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if ((input_attributes.rotation == 90) || (input_attributes.rotation == 270))
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{
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rect.max.x = image_info->height_samples;
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rect.max.y = image_info->width_samples;
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}
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else
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{
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rect.max.x = image_info->width_samples;
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rect.max.y = image_info->height_samples;
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}
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bitmap = create_bitmap (& rect);
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if (! bitmap)
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{
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fprintf (stderr, "can't allocate bitmap\n");
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fprintf (stderr, "width %d height %d\n", image_info->width_samples, image_info->height_samples);
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goto fail;
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}
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for (row = 0; row < rect.max.y; row++)
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if (1 != TIFFReadScanline (tiff_in,
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bitmap->bits + row * bitmap->row_words,
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row,
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0))
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{
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fprintf (stderr, "can't read TIFF scanline\n");
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goto fail;
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}
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#ifdef TIFF_REVERSE_BITS
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reverse_bits ((uint8_t *) bitmap->bits,
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rect.max.y * bitmap->row_words * sizeof (word_t));
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#endif /* TIFF_REVERSE_BITS */
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#if 0
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if (input_attributes.has_page_size)
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bitmap = resize_bitmap (bitmap,
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input_attributes.page_size.width * x_resolution,
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input_attributes.page_size.height * y_resolution);
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#endif
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rotate_bitmap (bitmap, input_attributes.rotation);
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#if 0
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pdf_write_text (page);
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#else
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pdf_write_g4_fax_image (page,
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position.x, position.y,
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image_info->width_points, image_info->height_points,
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image_info->negative,
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bitmap,
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input_attributes.colormap,
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input_attributes.transparency);
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#endif
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result = 1;
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fail:
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if (bitmap)
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free_bitmap (bitmap);
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return (result);
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}
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input_handler_t tiff_handler =
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{
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match_tiff_suffix,
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open_tiff_input_file,
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close_tiff_input_file,
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last_tiff_input_page,
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get_tiff_image_info,
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process_tiff_image
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};
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void init_tiff_handler (void)
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{
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install_input_handler (& tiff_handler);
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}
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