879 lines
22 KiB
C
879 lines
22 KiB
C
/* load PDF with libpoppler
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*
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* 7/2/16
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* - from openslideload.c
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* 12/5/16
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* - add @n ... number of pages to load
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* 23/11/16
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* - set page-height, if we can
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* 28/6/17
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* - use a much larger strip size, thanks bubba
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* 8/6/18
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* - add background param
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* 16/8/18 [kleisauke]
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* - shut down the input file as soon as we can
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* 19/9/19
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* - reopen the input if we minimised too early
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* 11/3/20
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* - move on top of VipsSource
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* 21/9/20
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* - allow dpi and scale to both be set [le0daniel]
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* 21/4/21 kleisauke
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* - include GObject part from pdfload.c
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* 28/1/22
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* - add password
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser 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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(at your option) any later version.
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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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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/*
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#define DEBUG
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <glib/gi18n-lib.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <vips/vips.h>
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#include <vips/buf.h>
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#include <vips/internal.h>
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#include "pforeign.h"
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#ifdef HAVE_POPPLER
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#include <cairo.h>
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#include <poppler.h>
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/* Render PDFs with tiles this size. They need to be pretty big to limit
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* overcomputation.
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*
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* An A4 page at 300dpi is 3508 pixels, so this should be enough to prevent
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* most rerendering.
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*/
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#define TILE_SIZE (4000)
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#define VIPS_TYPE_FOREIGN_LOAD_PDF (vips_foreign_load_pdf_get_type())
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#define VIPS_FOREIGN_LOAD_PDF( obj ) \
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(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
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VIPS_TYPE_FOREIGN_LOAD_PDF, VipsForeignLoadPdf ))
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#define VIPS_FOREIGN_LOAD_PDF_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_CAST( (klass), \
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VIPS_TYPE_FOREIGN_LOAD_PDF, VipsForeignLoadPdfClass))
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#define VIPS_IS_FOREIGN_LOAD_PDF( obj ) \
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(G_TYPE_CHECK_INSTANCE_TYPE( (obj), VIPS_TYPE_FOREIGN_LOAD_PDF ))
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#define VIPS_IS_FOREIGN_LOAD_PDF_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_TYPE( (klass), VIPS_TYPE_FOREIGN_LOAD_PDF ))
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#define VIPS_FOREIGN_LOAD_PDF_GET_CLASS( obj ) \
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(G_TYPE_INSTANCE_GET_CLASS( (obj), \
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VIPS_TYPE_FOREIGN_LOAD_PDF, VipsForeignLoadPdfClass ))
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typedef struct _VipsForeignLoadPdf {
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VipsForeignLoad parent_object;
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/* The VipsSource we load from, and the GInputStream we wrap around
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* it. Set from subclasses.
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*/
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VipsSource *source;
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GInputStream *stream;
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/* Load this page.
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*/
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int page_no;
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/* Load this many pages.
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*/
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int n;
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/* Render at this DPI.
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*/
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double dpi;
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/* Scale by this factor.
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*/
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double scale;
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/* The total scale factor we render with.
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*/
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double total_scale;
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/* Background colour.
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*/
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VipsArrayDouble *background;
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/* Decrypt with this.
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*/
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const char *password;
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/* Poppler is not thread-safe, so we run inside a single-threaded
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* cache. On the plus side, this means we only need one @page pointer,
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* even though we change this during _generate().
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*/
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PopplerDocument *doc;
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PopplerPage *page;
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int current_page;
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/* Doc has this many pages.
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*/
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int n_pages;
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/* We need to read out the size of each page we will render, and lay
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* them out in the final image.
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*/
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VipsRect image;
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VipsRect *pages;
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/* The [double] background converted to the image format.
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*/
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VipsPel *ink;
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} VipsForeignLoadPdf;
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typedef struct _VipsForeignLoadPdfClass {
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VipsForeignLoadClass parent_class;
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} VipsForeignLoadPdfClass;
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G_DEFINE_ABSTRACT_TYPE( VipsForeignLoadPdf, vips_foreign_load_pdf,
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VIPS_TYPE_FOREIGN_LOAD );
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static void
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vips_foreign_load_pdf_dispose( GObject *gobject )
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{
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VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF( gobject );
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VIPS_UNREF( pdf->page );
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VIPS_UNREF( pdf->doc );
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VIPS_UNREF( pdf->source );
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VIPS_UNREF( pdf->stream );
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G_OBJECT_CLASS( vips_foreign_load_pdf_parent_class )->
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dispose( gobject );
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}
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static int
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vips_foreign_load_pdf_build( VipsObject *object )
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{
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VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF( object );
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GError *error = NULL;
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if( vips_source_rewind( pdf->source ) )
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return( -1 );
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pdf->total_scale = pdf->scale * pdf->dpi / 72.0;
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pdf->stream = vips_g_input_stream_new_from_source( pdf->source );
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if( !(pdf->doc = poppler_document_new_from_stream( pdf->stream,
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vips_source_length( pdf->source ), pdf->password,
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NULL, &error )) ) {
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vips_g_error( &error );
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return( -1 );
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}
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if( VIPS_OBJECT_CLASS( vips_foreign_load_pdf_parent_class )->
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build( object ) )
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return( -1 );
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return( 0 );
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}
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static VipsForeignFlags
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vips_foreign_load_pdf_get_flags_filename( const char *filename )
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{
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/* We can render any part of the page on demand.
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*/
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return( VIPS_FOREIGN_PARTIAL );
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}
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static VipsForeignFlags
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vips_foreign_load_pdf_get_flags( VipsForeignLoad *load )
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{
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return( VIPS_FOREIGN_PARTIAL );
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}
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static int
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vips_foreign_load_pdf_get_page( VipsForeignLoadPdf *pdf, int page_no )
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{
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if( pdf->current_page != page_no ||
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!pdf->page ) {
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( pdf );
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VIPS_UNREF( pdf->page );
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pdf->current_page = -1;
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#ifdef DEBUG
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printf( "vips_foreign_load_pdf_get_page: %d\n", page_no );
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#endif /*DEBUG*/
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if( !(pdf->page =
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poppler_document_get_page( pdf->doc, page_no )) ) {
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vips_error( class->nickname,
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_( "unable to load page %d" ), page_no );
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return( -1 );
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}
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pdf->current_page = page_no;
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}
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return( 0 );
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}
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/* String-based metadata fields we extract.
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*/
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typedef struct _VipsForeignLoadPdfMetadata {
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char *(*pdf_fetch)( PopplerDocument *doc );
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char *field;
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} VipsForeignLoadPdfMetadata;
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static VipsForeignLoadPdfMetadata vips_foreign_load_pdf_metadata[] = {
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{ poppler_document_get_title, "pdf-title" },
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{ poppler_document_get_author, "pdf-author" },
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{ poppler_document_get_subject, "pdf-subject" },
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{ poppler_document_get_keywords, "pdf-keywords" },
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{ poppler_document_get_creator, "pdf-creator" },
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{ poppler_document_get_producer, "pdf-producer" },
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{ poppler_document_get_metadata, "pdf-metadata" },
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};
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static int n_metadata = VIPS_NUMBER( vips_foreign_load_pdf_metadata );
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static int
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vips_foreign_load_pdf_set_image( VipsForeignLoadPdf *pdf, VipsImage *out )
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{
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int i;
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double res;
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#ifdef DEBUG
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printf( "vips_foreign_load_pdf_set_image: %p\n", pdf );
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#endif /*DEBUG*/
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/* Extract and attach metadata. Set the old name too for compat.
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*/
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vips_image_set_int( out, "pdf-n_pages", pdf->n_pages );
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vips_image_set_int( out, VIPS_META_N_PAGES, pdf->n_pages );
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for( i = 0; i < n_metadata; i++ ) {
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VipsForeignLoadPdfMetadata *metadata =
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&vips_foreign_load_pdf_metadata[i];
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char *str;
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if( (str = metadata->pdf_fetch( pdf->doc )) ) {
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vips_image_set_string( out, metadata->field, str );
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g_free( str );
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}
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}
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/* We need pixels/mm for vips.
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*/
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res = pdf->dpi / 25.4;
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vips_image_init_fields( out,
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pdf->image.width, pdf->image.height,
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4, VIPS_FORMAT_UCHAR,
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VIPS_CODING_NONE, VIPS_INTERPRETATION_sRGB, res, res );
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/* We render to a tilecache, so it has to be SMALLTILE.
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*/
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if( vips_image_pipelinev( out, VIPS_DEMAND_STYLE_SMALLTILE, NULL ) )
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return( -1 );
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return( 0 );
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}
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static int
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vips_foreign_load_pdf_header( VipsForeignLoad *load )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( load );
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VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF( load );
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int top;
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int i;
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#ifdef DEBUG
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printf( "vips_foreign_load_pdf_header: %p\n", pdf );
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#endif /*DEBUG*/
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pdf->n_pages = poppler_document_get_n_pages( pdf->doc );
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/* @n == -1 means until the end of the doc.
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*/
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if( pdf->n == -1 )
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pdf->n = pdf->n_pages - pdf->page_no;
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if( pdf->page_no + pdf->n > pdf->n_pages ||
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pdf->page_no < 0 ||
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pdf->n <= 0 ) {
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vips_error( class->nickname, "%s", _( "pages out of range" ) );
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return( -1 );
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}
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/* Lay out the pages in our output image.
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*/
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if( !(pdf->pages = VIPS_ARRAY( pdf, pdf->n, VipsRect )) )
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return( -1 );
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top = 0;
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pdf->image.left = 0;
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pdf->image.top = 0;
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pdf->image.width = 0;
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pdf->image.height = 0;
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for( i = 0; i < pdf->n; i++ ) {
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double width;
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double height;
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if( vips_foreign_load_pdf_get_page( pdf, pdf->page_no + i ) )
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return( -1 );
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poppler_page_get_size( pdf->page, &width, &height );
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pdf->pages[i].left = 0;
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pdf->pages[i].top = top;
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/* We do round to nearest, in the same way that vips_resize()
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* does round to nearest. Without this, things like
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* shrink-on-load will break.
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*/
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pdf->pages[i].width = VIPS_RINT( width * pdf->total_scale );
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pdf->pages[i].height = VIPS_RINT( height * pdf->total_scale );
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if( pdf->pages[i].width > pdf->image.width )
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pdf->image.width = pdf->pages[i].width;
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pdf->image.height += pdf->pages[i].height;
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top += pdf->pages[i].height;
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}
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/* If all pages are the same height, we can tag this as a toilet roll
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* image.
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*/
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for( i = 1; i < pdf->n; i++ )
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if( pdf->pages[i].height != pdf->pages[0].height )
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break;
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/* Only set page-height if we have more than one page, or this could
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* accidentally turn into an animated image later.
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*/
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if( pdf->n > 1 )
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vips_image_set_int( load->out,
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VIPS_META_PAGE_HEIGHT, pdf->pages[0].height );
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vips_foreign_load_pdf_set_image( pdf, load->out );
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/* Convert the background to the image format.
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*/
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if( !(pdf->ink = vips__vector_to_ink( class->nickname,
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load->out,
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VIPS_AREA( pdf->background )->data, NULL,
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VIPS_AREA( pdf->background )->n )) )
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return( -1 );
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/* Swap to cairo-style premultiplied bgra.
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*/
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vips__rgba2bgra_premultiplied( (guint32 *) pdf->ink, 1 );
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vips_source_minimise( pdf->source );
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return( 0 );
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}
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static void
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vips_foreign_load_pdf_minimise( VipsImage *image, VipsForeignLoadPdf *pdf )
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{
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vips_source_minimise( pdf->source );
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}
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static int
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vips_foreign_load_pdf_generate( VipsRegion *or,
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void *seq, void *a, void *b, gboolean *stop )
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{
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VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF( a );
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VipsRect *r = &or->valid;
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int top;
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int i;
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int y;
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/*
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printf( "vips_foreign_load_pdf_generate: "
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"left = %d, top = %d, width = %d, height = %d\n",
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r->left, r->top, r->width, r->height );
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*/
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/* Poppler won't always paint the background.
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*/
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vips_region_paint_pel( or, r, pdf->ink );
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/* Search through the pages we are drawing for the first containing
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* this rect. This could be quicker, perhaps a binary search, but who
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* cares.
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*/
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for( i = 0; i < pdf->n; i++ )
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if( VIPS_RECT_BOTTOM( &pdf->pages[i] ) > r->top )
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break;
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top = r->top;
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while( top < VIPS_RECT_BOTTOM( r ) ) {
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VipsRect rect;
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cairo_surface_t *surface;
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cairo_t *cr;
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vips_rect_intersectrect( r, &pdf->pages[i], &rect );
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surface = cairo_image_surface_create_for_data(
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VIPS_REGION_ADDR( or, rect.left, rect.top ),
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CAIRO_FORMAT_ARGB32,
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rect.width, rect.height,
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VIPS_REGION_LSKIP( or ) );
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cr = cairo_create( surface );
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cairo_surface_destroy( surface );
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cairo_scale( cr, pdf->total_scale, pdf->total_scale );
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cairo_translate( cr,
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(pdf->pages[i].left - rect.left) / pdf->total_scale,
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(pdf->pages[i].top - rect.top) / pdf->total_scale );
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/* poppler is single-threaded, but we don't need to lock since
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* we're running inside a non-threaded tilecache.
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*/
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if( vips_foreign_load_pdf_get_page( pdf, pdf->page_no + i ) )
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return( -1 );
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poppler_page_render( pdf->page, cr );
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cairo_destroy( cr );
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top += rect.height;
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i += 1;
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}
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/* Cairo makes pre-multipled BRGA, we must byteswap and unpremultiply.
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*/
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for( y = 0; y < r->height; y++ )
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vips__premultiplied_bgra2rgba(
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(guint32 *) VIPS_REGION_ADDR( or, r->left, r->top + y ),
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r->width );
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return( 0 );
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}
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static int
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vips_foreign_load_pdf_load( VipsForeignLoad *load )
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{
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VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF( load );
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VipsImage **t = (VipsImage **)
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vips_object_local_array( (VipsObject *) load, 2 );
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#ifdef DEBUG
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printf( "vips_foreign_load_pdf_load: %p\n", pdf );
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#endif /*DEBUG*/
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/* Read to this image, then cache to out, see below.
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*/
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t[0] = vips_image_new();
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/* Close input immediately at end of read.
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*/
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g_signal_connect( t[0], "minimise",
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G_CALLBACK( vips_foreign_load_pdf_minimise ), pdf );
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vips_foreign_load_pdf_set_image( pdf, t[0] );
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if( vips_image_generate( t[0],
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NULL, vips_foreign_load_pdf_generate, NULL, pdf, NULL ) ||
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vips_tilecache( t[0], &t[1],
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"tile_width", TILE_SIZE,
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"tile_height", TILE_SIZE,
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"max_tiles", 2 * (1 + t[0]->Xsize / TILE_SIZE),
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NULL ) ||
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vips_image_write( t[1], load->real ) )
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return( -1 );
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return( 0 );
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}
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static void
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vips_foreign_load_pdf_class_init( VipsForeignLoadPdfClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
|
|
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
|
|
|
|
gobject_class->dispose = vips_foreign_load_pdf_dispose;
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
object_class->nickname = "pdfload_base";
|
|
object_class->description = _( "load PDF with libpoppler" );
|
|
object_class->build = vips_foreign_load_pdf_build;
|
|
|
|
/* libpoppler is fuzzed, but not by us.
|
|
*/
|
|
operation_class->flags |= VIPS_OPERATION_UNTRUSTED;
|
|
|
|
load_class->get_flags_filename =
|
|
vips_foreign_load_pdf_get_flags_filename;
|
|
load_class->get_flags = vips_foreign_load_pdf_get_flags;
|
|
load_class->header = vips_foreign_load_pdf_header;
|
|
load_class->load = vips_foreign_load_pdf_load;
|
|
|
|
VIPS_ARG_INT( class, "page", 20,
|
|
_( "Page" ),
|
|
_( "First page to load" ),
|
|
VIPS_ARGUMENT_OPTIONAL_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadPdf, page_no ),
|
|
0, 100000, 0 );
|
|
|
|
VIPS_ARG_INT( class, "n", 21,
|
|
_( "n" ),
|
|
_( "Number of pages to load, -1 for all" ),
|
|
VIPS_ARGUMENT_OPTIONAL_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadPdf, n ),
|
|
-1, 100000, 1 );
|
|
|
|
VIPS_ARG_DOUBLE( class, "dpi", 22,
|
|
_( "DPI" ),
|
|
_( "DPI to render at" ),
|
|
VIPS_ARGUMENT_OPTIONAL_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadPdf, dpi ),
|
|
0.001, 100000.0, 72.0 );
|
|
|
|
VIPS_ARG_DOUBLE( class, "scale", 23,
|
|
_( "Scale" ),
|
|
_( "Factor to scale by" ),
|
|
VIPS_ARGUMENT_OPTIONAL_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadPdf, scale ),
|
|
0.001, 100000.0, 1.0 );
|
|
|
|
VIPS_ARG_BOXED( class, "background", 24,
|
|
_( "Background" ),
|
|
_( "Background colour" ),
|
|
VIPS_ARGUMENT_OPTIONAL_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadPdf, background ),
|
|
VIPS_TYPE_ARRAY_DOUBLE );
|
|
|
|
VIPS_ARG_STRING( class, "password", 25,
|
|
_( "Password" ),
|
|
_( "Password to decrypt with" ),
|
|
VIPS_ARGUMENT_OPTIONAL_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadPdf, password ),
|
|
NULL );
|
|
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_pdf_init( VipsForeignLoadPdf *pdf )
|
|
{
|
|
pdf->dpi = 72.0;
|
|
pdf->scale = 1.0;
|
|
pdf->n = 1;
|
|
pdf->current_page = -1;
|
|
pdf->background = vips_array_double_newv( 1, 255.0 );
|
|
}
|
|
|
|
typedef struct _VipsForeignLoadPdfFile {
|
|
VipsForeignLoadPdf parent_object;
|
|
|
|
/* Filename for load.
|
|
*/
|
|
char *filename;
|
|
|
|
char *uri;
|
|
|
|
} VipsForeignLoadPdfFile;
|
|
|
|
typedef VipsForeignLoadPdfClass VipsForeignLoadPdfFileClass;
|
|
|
|
G_DEFINE_TYPE( VipsForeignLoadPdfFile, vips_foreign_load_pdf_file,
|
|
vips_foreign_load_pdf_get_type() );
|
|
|
|
static void
|
|
vips_foreign_load_pdf_file_dispose( GObject *gobject )
|
|
{
|
|
VipsForeignLoadPdfFile *file =
|
|
(VipsForeignLoadPdfFile *) gobject;
|
|
|
|
VIPS_FREE( file->uri );
|
|
|
|
G_OBJECT_CLASS( vips_foreign_load_pdf_file_parent_class )->
|
|
dispose( gobject );
|
|
}
|
|
|
|
static int
|
|
vips_foreign_load_pdf_file_header( VipsForeignLoad *load )
|
|
{
|
|
VipsForeignLoadPdfFile *file = (VipsForeignLoadPdfFile *) load;
|
|
|
|
VIPS_SETSTR( load->out->filename, file->filename );
|
|
|
|
return( VIPS_FOREIGN_LOAD_CLASS(
|
|
vips_foreign_load_pdf_file_parent_class )->header( load ) );
|
|
}
|
|
|
|
static const char *vips_foreign_pdf_suffs[] = {
|
|
".pdf",
|
|
NULL
|
|
};
|
|
|
|
static int
|
|
vips_foreign_load_pdf_file_build( VipsObject *object )
|
|
{
|
|
VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF( object );
|
|
VipsForeignLoadPdfFile *file = (VipsForeignLoadPdfFile *) pdf;
|
|
|
|
#ifdef DEBUG
|
|
printf( "vips_foreign_load_pdf_file_build: %s\n", file->filename );
|
|
#endif /*DEBUG*/
|
|
|
|
if( file->filename ) {
|
|
char *path;
|
|
GError *error = NULL;
|
|
|
|
/* We need an absolute path for a URI.
|
|
*/
|
|
path = vips_realpath( file->filename );
|
|
if( !(file->uri = g_filename_to_uri( path, NULL, &error )) ) {
|
|
g_free( path );
|
|
vips_g_error( &error );
|
|
return( -1 );
|
|
}
|
|
g_free( path );
|
|
|
|
if( !(pdf->source =
|
|
vips_source_new_from_file( file->filename )) )
|
|
return( -1 );
|
|
|
|
}
|
|
|
|
return( VIPS_OBJECT_CLASS( vips_foreign_load_pdf_file_parent_class )->
|
|
build( object ) );
|
|
}
|
|
|
|
static gboolean
|
|
vips_foreign_load_pdf_is_a_buffer( const void *buf, size_t len )
|
|
{
|
|
const guchar *str = (const guchar *) buf;
|
|
|
|
if( len >= 4 &&
|
|
str[0] == '%' &&
|
|
str[1] == 'P' &&
|
|
str[2] == 'D' &&
|
|
str[3] == 'F' )
|
|
return( 1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static gboolean
|
|
vips_foreign_load_pdf_is_a( const char *filename )
|
|
{
|
|
unsigned char buf[4];
|
|
|
|
if( vips__get_bytes( filename, buf, 4 ) == 4 &&
|
|
vips_foreign_load_pdf_is_a_buffer( buf, 4 ) )
|
|
return( 1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_pdf_file_class_init(
|
|
VipsForeignLoadPdfFileClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
|
|
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
|
|
|
|
gobject_class->dispose = vips_foreign_load_pdf_file_dispose;
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
object_class->nickname = "pdfload";
|
|
object_class->description = _( "load PDF from file" );
|
|
object_class->build = vips_foreign_load_pdf_file_build;
|
|
|
|
foreign_class->suffs = vips_foreign_pdf_suffs;
|
|
|
|
load_class->is_a = vips_foreign_load_pdf_is_a;
|
|
load_class->header = vips_foreign_load_pdf_file_header;
|
|
|
|
VIPS_ARG_STRING( class, "filename", 1,
|
|
_( "Filename" ),
|
|
_( "Filename to load from" ),
|
|
VIPS_ARGUMENT_REQUIRED_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadPdfFile, filename ),
|
|
NULL );
|
|
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_pdf_file_init( VipsForeignLoadPdfFile *file )
|
|
{
|
|
}
|
|
|
|
typedef struct _VipsForeignLoadPdfBuffer {
|
|
VipsForeignLoadPdf parent_object;
|
|
|
|
/* Load from a buffer.
|
|
*/
|
|
VipsArea *buf;
|
|
|
|
} VipsForeignLoadPdfBuffer;
|
|
|
|
typedef VipsForeignLoadPdfClass VipsForeignLoadPdfBufferClass;
|
|
|
|
G_DEFINE_TYPE( VipsForeignLoadPdfBuffer, vips_foreign_load_pdf_buffer,
|
|
vips_foreign_load_pdf_get_type() );
|
|
|
|
static int
|
|
vips_foreign_load_pdf_buffer_build( VipsObject *object )
|
|
{
|
|
VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF( object );
|
|
VipsForeignLoadPdfBuffer *buffer = (VipsForeignLoadPdfBuffer *) pdf;
|
|
|
|
if( buffer->buf &&
|
|
!(pdf->source = vips_source_new_from_memory(
|
|
VIPS_AREA( buffer->buf )->data,
|
|
VIPS_AREA( buffer->buf )->length )) )
|
|
return( -1 );
|
|
|
|
return( VIPS_OBJECT_CLASS( vips_foreign_load_pdf_buffer_parent_class )->
|
|
build( object ) );
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_pdf_buffer_class_init(
|
|
VipsForeignLoadPdfBufferClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
|
|
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
object_class->nickname = "pdfload_buffer";
|
|
object_class->description = _( "load PDF from buffer" );
|
|
object_class->build = vips_foreign_load_pdf_buffer_build;
|
|
|
|
load_class->is_a_buffer = vips_foreign_load_pdf_is_a_buffer;
|
|
|
|
VIPS_ARG_BOXED( class, "buffer", 1,
|
|
_( "Buffer" ),
|
|
_( "Buffer to load from" ),
|
|
VIPS_ARGUMENT_REQUIRED_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadPdfBuffer, buf ),
|
|
VIPS_TYPE_BLOB );
|
|
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_pdf_buffer_init( VipsForeignLoadPdfBuffer *buffer )
|
|
{
|
|
}
|
|
|
|
typedef struct _VipsForeignLoadPdfSource {
|
|
VipsForeignLoadPdf parent_object;
|
|
|
|
VipsSource *source;
|
|
|
|
} VipsForeignLoadPdfSource;
|
|
|
|
typedef VipsForeignLoadPdfClass VipsForeignLoadPdfSourceClass;
|
|
|
|
G_DEFINE_TYPE( VipsForeignLoadPdfSource, vips_foreign_load_pdf_source,
|
|
vips_foreign_load_pdf_get_type() );
|
|
|
|
static int
|
|
vips_foreign_load_pdf_source_build( VipsObject *object )
|
|
{
|
|
VipsForeignLoadPdf *pdf = VIPS_FOREIGN_LOAD_PDF( object );
|
|
VipsForeignLoadPdfSource *source = (VipsForeignLoadPdfSource *) pdf;
|
|
|
|
if( source->source ) {
|
|
pdf->source = source->source;
|
|
g_object_ref( pdf->source );
|
|
}
|
|
|
|
return( VIPS_OBJECT_CLASS( vips_foreign_load_pdf_source_parent_class )->
|
|
build( object ) );
|
|
}
|
|
|
|
static gboolean
|
|
vips_foreign_load_pdf_source_is_a_source( VipsSource *source )
|
|
{
|
|
const unsigned char *p;
|
|
|
|
return( (p = vips_source_sniff( source, 4 )) &&
|
|
p[0] == '%' &&
|
|
p[1] == 'P' &&
|
|
p[2] == 'D' &&
|
|
p[3] == 'F' );
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_pdf_source_class_init(
|
|
VipsForeignLoadPdfSourceClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
|
|
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
|
|
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
object_class->nickname = "pdfload_source";
|
|
object_class->description = _( "load PDF from source" );
|
|
object_class->build = vips_foreign_load_pdf_source_build;
|
|
|
|
operation_class->flags |= VIPS_OPERATION_NOCACHE;
|
|
|
|
load_class->is_a_source = vips_foreign_load_pdf_source_is_a_source;
|
|
|
|
VIPS_ARG_OBJECT( class, "source", 1,
|
|
_( "Source" ),
|
|
_( "Source to load from" ),
|
|
VIPS_ARGUMENT_REQUIRED_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadPdfSource, source ),
|
|
VIPS_TYPE_SOURCE );
|
|
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_pdf_source_init( VipsForeignLoadPdfSource *source )
|
|
{
|
|
}
|
|
|
|
#endif /*defined(HAVE_POPPLER)*/
|
|
|
|
/* The C API wrappers are defined in foreign.c.
|
|
*/
|