set_option("searchpath={" . $searchpath . "}"); /* This means we must check return values of load_font() etc. */ $p->set_option("errorpolicy=return"); if ($p->begin_document($outfile, "") == 0) throw new Exception("Error: " . $p->get_errmsg()); $p->set_info("Creator", "PDFlib Cookbook"); $p->set_info("Title", $title); /* Load the image */ $image = $p->load_image("auto", $imagefile, ""); if ($image == 0) throw new Exception("Error: " . $p->get_errmsg()); /* Define size and position of image box. */ $box_width = $pg_height / 2; $box_height = $pg_width / 2; $img_llx = ($pg_width - $box_width) / 2; $img_lly = ($pg_height - $box_height) / 2; /* Position and size of headline box */ $headline_displacement = 40; $headline_llx = $img_llx; $headline_lly = $img_lly + $box_height + $headline_displacement; $headline_width = $box_width; $headline_height = $headline_displacement; /* Start page */ $p->begin_page_ext($pg_width, $pg_height, ""); /* Create a headline */ $p->fit_textline( "Place an image with an alpha channel over a background", $headline_llx, $headline_lly, "boxsize={" . $headline_width . " " . $headline_height . "} " . "fontname=NotoSerif-Regular fontsize=18 position=center"); /* * Put a text in the background, covering the same area as the * image. */ $tf = 0; for ($i = 0; $i < $repeat_text; $i += 1) { $tf = $p->add_textflow($tf, $bg_text, "fontname=NotoSerif-Regular fontsize=12 alignment=justify"); } /* Place the textflow */ $p->fit_textflow($tf, $img_llx, $img_lly, $img_llx + $box_width, $img_lly + $box_height, ""); $p->delete_textflow($tf); /* Place the image over the textflow */ $p->fit_image($image, $img_llx, $img_lly, "boxsize={" . $box_width . " " . $box_height . "} " . "fitmethod=meet showborder position=center"); $p->close_image($image); $p->end_page_ext(""); $p->end_document(""); $buf = $p->get_buffer(); $len = strlen($buf); header("Content-type: application/pdf"); header("Content-Length: $len"); header("Content-Disposition: inline; filename=alpha_channel.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("PHP exception occurred: " . $e->getMessage() . "\n"); exit(1); } $p = 0; ?>