<?php
/**
 *
 * 
 * Repeated contents: In order to keep the output file size as small as possible
 * handles to imported PDF pages or images can and should be reused for repeated
 * contents.
 * 
 * Required software: PDFlib+PDI/PPS 10
 * Required data: PDF document, image file
 */
/* This is where the data files are. Adjust as necessary. */
$searchpath = dirname(__FILE__,3) . "/input";

/* By default annotations are also imported. In some cases this
 * requires the Noto fonts for creating annotation appearance streams.
 * We therefore set the searchpath to also point to the font directory.
 */
$fontpath = dirname(__FILE__,3)."/resource/font";
$title = "Repeated Contents";

$pagecount = 3;

$p = null;
$imagefile1 = "cambodia_preah_khan1.jpg";
$imagefile2 = "cambodia_preah_khan2.jpg";
$imagefile3 = "cambodia_preah_khan3.jpg";
$background = "card.pdf";

try {
    $p = new pdflib();
    
    
    $p->set_option("searchpath={" . $searchpath . "}");
    
    $p->set_option("searchpath={" . $fontpath . "}");
    
    /* This means we must check return values of load_font() etc. */
    $p->set_option("errorpolicy=return");
    
    if ($p->begin_document("", "") == - 1)
        throw new Exception("Error: " . $p->get_errmsg());
    
    $p->set_info("Creator", "PDFlib Cookbook");
    $p->set_info("Title", $title);
    
    /* Load the three images */
    $image1 = $p->load_image("auto", $imagefile1, "");
    if ($image1 == - 1)
        throw new Exception("Error loading image " . $imagefile1 . ": " .
                                         $p->get_errmsg());
    
    $image2 = $p->load_image("auto", $imagefile2, "");
    if ($image2 == - 1)
        throw new Exception("Error loading image " . imagefile2 . ": " .
                                         $p->get_errmsg());
    
    $image3 = $p->load_image("auto", $imagefile3, "");
    if ($image3 == - 1)
        throw new Exception("Error loading image " . $imagefile3 . ": " .
                                         $p->get_errmsg());
        
    /* Open the card file */
    $card = $p->open_pdi_document($background, "");
    if ($card == - 1)
        throw new Exception("Error: " . $p->get_errmsg());
        
    /* Load the first page of the card file */
    $cardpage = $p->open_pdi_page($card, 1, "");
    if ($cardpage == - 1)
        throw new Exception("Error: " . $p->get_errmsg());
        
    /* Create textflow for explanation */
    $explanation = "Reuse PDI page, image and textflow handles across " .
                   "multiple pages";
    $optlist = "alignment=left fontname=NotoSerif-Regular fontsize=20";
    $tf = $p->create_textflow($explanation, $optlist);
    if ($tf == 0) {
        throw new Exception("Error: " . $p->get_errmsg());
    }
    
    /* Query the width and height of the first page of the card */
    $cardwidth = $p->pcos_get_number($card, "pages[0]/width");
    $cardheight = $p->pcos_get_number($card, "pages[0]/height");
    
    /* Offset factor from page border for content */
    $offset = 0.15;
    
    /*
     * Now reuse the PDI page handle, the image handles and the textflow handle
     * on all the pages.
     */
    for($page = 1; $page <= $pagecount; $page += 1) {
        $p->begin_page_ext($cardwidth, $cardheight, "");
        
        /* Place the card page as background */
        $p->fit_pdi_page($cardpage, 0, 0, "");
        
        /* Place images */
        $p->fit_image($image1, $cardwidth * $offset, $cardheight * $offset, "");
        $p->fit_image($image2, $cardwidth * (1 - $offset), 
                        $cardheight * $offset, "position={right bottom}");
        $p->fit_image($image3, $cardwidth * (1 - $offset), 
                        $cardheight * (1 - $offset), "position={right top}");
        
        /* Place textflow, must be rewound each time */
        $p->fit_textflow($tf, $cardwidth * $offset, $cardheight * 0.5, 
                        $cardwidth * 0.5, $cardheight * (1 - $offset), 
                        "rewind=1");
        
        /* Create a page number at the bottom center of the page */
        $p->fit_textline("- " . $page . " -", $cardwidth * 0.5, 
                        $cardheight * $offset / 2, 
                        "fontname=NotoSerif-Regular fontsize=12 position=center");
        
        $p->end_page_ext("");
    }
    
    /* Clean up all handles */
    $p->close_image($image1);
    $p->close_image($image2);
    $p->close_image($image3);
    $p->close_pdi_page($cardpage);
    $p->close_pdi_document($card);
    $p->delete_textflow($tf);
    
    $p->end_document("");
    
    $buf = $p->get_buffer();
    $len = strlen($buf);
    
    header("Content-type: application/pdf");
    header("Content-Length: $len");
    header("Content-Disposition: inline; filename=import_repeated_contents.pdf");
    print $buf;
}
catch (PDFlibException $e) {
    echo("PDFlib exception occurred:\n" . "[" .
         $e->get_errnum() . "] " . $e->get_apiname() .
         ": " . $e->get_errmsg() . "\n");
    exit(1);
}
catch (Throwable $e) {
    echo($e);
    exit(1);
}

$p = 0;
?>