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/*
* PDF posteriser; split pages within a PDF file into smaller lumps.
*/
#include "mupdf/fitz.h"
#include "mupdf/pdf.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
static int x_factor = 0;
static int y_factor = 0;
static void usage(void)
{
fprintf(stderr,
"usage: mutool poster [options] input.pdf [output.pdf]\n"
"\t-p -\tpassword\n"
"\t-x\tx decimation factor\n"
"\t-y\ty decimation factor\n");
exit(1);
}
static void
intersect_box(fz_context *ctx, pdf_document *doc, pdf_obj *page, pdf_obj *box_name, fz_rect mb)
{
pdf_obj *box = pdf_dict_get(ctx, page, box_name);
pdf_obj *newbox;
fz_rect old_rect;
if (box == NULL)
return;
old_rect.x0 = pdf_array_get_real(ctx, box, 0);
old_rect.y0 = pdf_array_get_real(ctx, box, 1);
old_rect.x1 = pdf_array_get_real(ctx, box, 2);
old_rect.y1 = pdf_array_get_real(ctx, box, 3);
if (old_rect.x0 < mb.x0)
old_rect.x0 = mb.x0;
if (old_rect.y0 < mb.y0)
old_rect.y0 = mb.y0;
if (old_rect.x1 > mb.x1)
old_rect.x1 = mb.x1;
if (old_rect.y1 > mb.y1)
old_rect.y1 = mb.y1;
newbox = pdf_new_array(ctx, doc, 4);
pdf_array_push_real(ctx, newbox, old_rect.x0);
pdf_array_push_real(ctx, newbox, old_rect.y0);
pdf_array_push_real(ctx, newbox, old_rect.x1);
pdf_array_push_real(ctx, newbox, old_rect.y1);
pdf_dict_put_drop(ctx, page, box_name, newbox);
}
/*
* Recreate page tree with our posterised pages in.
*/
static void decimatepages(fz_context *ctx, pdf_document *doc)
{
pdf_obj *oldroot, *root, *pages, *kids;
int num_pages = pdf_count_pages(ctx, doc);
int page, kidcount;
fz_rect mediabox;
fz_matrix page_ctm;
oldroot = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME(Root));
pages = pdf_dict_get(ctx, oldroot, PDF_NAME(Pages));
root = pdf_new_dict(ctx, doc, 2);
pdf_dict_put(ctx, root, PDF_NAME(Type), pdf_dict_get(ctx, oldroot, PDF_NAME(Type)));
pdf_dict_put(ctx, root, PDF_NAME(Pages), pdf_dict_get(ctx, oldroot, PDF_NAME(Pages)));
pdf_update_object(ctx, doc, pdf_to_num(ctx, oldroot), root);
pdf_drop_obj(ctx, root);
/* Create a new kids array with our new pages in */
kids = pdf_new_array(ctx, doc, 1);
kidcount = 0;
for (page=0; page < num_pages; page++)
{
pdf_page *page_details = pdf_load_page(ctx, doc, page);
int xf = x_factor, yf = y_factor;
float w, h;
int x, y;
pdf_page_transform(ctx, page_details, &mediabox, &page_ctm);
fz_drop_page(ctx, (fz_page *) page_details);
w = mediabox.x1 - mediabox.x0;
h = mediabox.y1 - mediabox.y0;
if (xf == 0 && yf == 0)
{
/* Nothing specified, so split along the long edge */
if (w > h)
xf = 2, yf = 1;
else
xf = 1, yf = 2;
}
else if (xf == 0)
xf = 1;
else if (yf == 0)
yf = 1;
for (y = yf-1; y >= 0; y--)
{
for (x = 0; x < xf; x++)
{
pdf_obj *newpageobj, *newpageref, *newmediabox;
fz_rect mb;
newpageobj = pdf_copy_dict(ctx, pdf_lookup_page_obj(ctx, doc, page));
pdf_flatten_inheritable_page_items(ctx, newpageobj);
newpageref = pdf_add_object(ctx, doc, newpageobj);
newmediabox = pdf_new_array(ctx, doc, 4);
mb.x0 = mediabox.x0 + (w/xf)*x;
if (x == xf-1)
mb.x1 = mediabox.x1;
else
mb.x1 = mediabox.x0 + (w/xf)*(x+1);
mb.y0 = mediabox.y0 + (h/yf)*y;
if (y == yf-1)
mb.y1 = mediabox.y1;
else
mb.y1 = mediabox.y0 + (h/yf)*(y+1);
pdf_array_push_real(ctx, newmediabox, mb.x0);
pdf_array_push_real(ctx, newmediabox, mb.y0);
pdf_array_push_real(ctx, newmediabox, mb.x1);
pdf_array_push_real(ctx, newmediabox, mb.y1);
pdf_dict_put(ctx, newpageobj, PDF_NAME(Parent), pages);
pdf_dict_put_drop(ctx, newpageobj, PDF_NAME(MediaBox), newmediabox);
intersect_box(ctx, doc, newpageobj, PDF_NAME(CropBox), mb);
intersect_box(ctx, doc, newpageobj, PDF_NAME(BleedBox), mb);
intersect_box(ctx, doc, newpageobj, PDF_NAME(TrimBox), mb);
intersect_box(ctx, doc, newpageobj, PDF_NAME(ArtBox), mb);
/* Store page object in new kids array */
pdf_drop_obj(ctx, newpageobj);
pdf_array_push_drop(ctx, kids, newpageref);
kidcount++;
}
}
}
/* Update page count and kids array */
pdf_dict_put_int(ctx, pages, PDF_NAME(Count), kidcount);
pdf_dict_put_drop(ctx, pages, PDF_NAME(Kids), kids);
}
int pdfposter_main(int argc, char **argv)
{
char *infile;
char *outfile = "out.pdf";
char *password = "";
int c;
pdf_write_options opts = { 0 };
pdf_document *doc;
fz_context *ctx;
while ((c = fz_getopt(argc, argv, "x:y:")) != -1)
{
switch (c)
{
case 'p': password = fz_optarg; break;
case 'x': x_factor = atoi(fz_optarg); break;
case 'y': y_factor = atoi(fz_optarg); break;
default: usage(); break;
}
}
if (argc - fz_optind < 1)
usage();
infile = argv[fz_optind++];
if (argc - fz_optind > 0 &&
(strstr(argv[fz_optind], ".pdf") || strstr(argv[fz_optind], ".PDF")))
{
outfile = argv[fz_optind++];
}
ctx = fz_new_context(NULL, NULL, FZ_STORE_UNLIMITED);
if (!ctx)
{
fprintf(stderr, "cannot initialise context\n");
exit(1);
}
doc = pdf_open_document(ctx, infile);
if (pdf_needs_password(ctx, doc))
if (!pdf_authenticate_password(ctx, doc, password))
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot authenticate password: %s", infile);
decimatepages(ctx, doc);
pdf_save_document(ctx, doc, outfile, &opts);
pdf_drop_document(ctx, doc);
fz_drop_context(ctx);
return 0;
}
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