/app/protected/extensions/pdf/dompdf/include/text_renderer.cls.php
PHP | 150 lines | 80 code | 31 blank | 39 comment | 17 complexity | 8ebf13a5cb7342edfca5130403735914 MD5 | raw file
Possible License(s): BSD-3-Clause, LGPL-2.1, LGPL-3.0, BSD-2-Clause, GPL-3.0
- <?php
- /**
- * @package dompdf
- * @link http://www.dompdf.com/
- * @author Benj Carson <benjcarson@digitaljunkies.ca>
- * @author Helmut Tischer <htischer@weihenstephan.org>
- * @author Fabien Ménager <fabien.menager@gmail.com>
- * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
- * @version $Id: text_renderer.cls.php 471 2012-02-06 21:59:10Z fabien.menager $
- */
- /**
- * Renders text frames
- *
- * @access private
- * @package dompdf
- */
- class Text_Renderer extends Abstract_Renderer {
-
- const DECO_THICKNESS = 0.02; // Thickness of underline. Screen: 0.08, print: better less, e.g. 0.04
- //Tweaking if $base and $descent are not accurate.
- //Check method_exists( $this->_canvas, "get_cpdf" )
- //- For cpdf these can and must stay 0, because font metrics are used directly.
- //- For other renderers, if different values are wanted, separate the parameter sets.
- // But $size and $size-$height seem to be accurate enough
- const UNDERLINE_OFFSET = 0.0; // Relative to bottom of text, as fraction of height.
- const OVERLINE_OFFSET = 0.0; // Relative to top of text
- const LINETHROUGH_OFFSET = 0.0; // Relative to centre of text.
- const DECO_EXTENSION = 0.0; // How far to extend lines past either end, in pt
-
- //........................................................................
- function render(Frame $frame) {
- $text = $frame->get_text();
- if ( trim($text) === "" )
- return;
-
- $style = $frame->get_style();
- list($x, $y) = $frame->get_position();
- $cb = $frame->get_containing_block();
- if ( ($ml = $style->margin_left) === "auto" || $ml === "none" )
- $ml = 0;
- if ( ($pl = $style->padding_left) === "auto" || $pl === "none" )
- $pl = 0;
- if ( ($bl = $style->border_left_width) === "auto" || $bl === "none" )
- $bl = 0;
- $x += $style->length_in_pt( array($ml, $pl, $bl), $cb["w"] );
- $font = $style->font_family;
- $size = $frame_font_size = $style->font_size;
- $height = $style->height;
- $word_spacing = $frame->get_text_spacing() + $style->length_in_pt($style->word_spacing);
- $char_spacing = $style->length_in_pt($style->letter_spacing);
- $width = $style->width;
- /*$text = str_replace(
- array("{PAGE_NUM}"),
- array($this->_canvas->get_page_number()),
- $text
- );*/
-
- $this->_canvas->text($x, $y, $text,
- $font, $size,
- $style->color, $word_spacing, $char_spacing);
-
- $line = $frame->get_containing_line();
-
- // FIXME Instead of using the tallest frame to position,
- // the decoration, the text should be well placed
- if ( false && $line->tallest_frame ) {
- $base_frame = $line->tallest_frame;
- $style = $base_frame->get_style();
- $size = $style->font_size;
- $height = $line->h * ($size / $style->line_height);
- }
-
- if ( method_exists( $this->_canvas, "get_cpdf" ) ) {
- $cpdf = $this->_canvas->get_cpdf();
-
- //$cpdf_font = $cpdf->fonts[$style->font_family];
- //$base = ($cpdf_font["UnderlinePosition"]*$size)/1000;
- //$descent = (($cpdf_font["Ascender"]-$cpdf_font["Descender"])*$size)/1000;
-
- $fontBBox = $cpdf->fonts[$style->font_family]['FontBBox'];
- $base = (($fontBBox[3]*$size)/1000) * 0.90;
- $descent = ($fontBBox[1]*$size)/1000;
- //print '<pre>Text_Renderer cpdf:'.$base.' '.$descent.' '.$size.'</pre>';
- } else {
- //Descent is font part below baseline, typically negative. $height is about full height of font box.
- //$descent = -$size/6; is less accurate, depends on font family.
- // @todo Could we get font info for PDFlib adapter and others ?
- $base = $size*1.08;
- $descent = $size-$height;
- //print '<pre>Text_Renderer other than cpdf:'.$base.' '.$descent.' '.$size.'</pre>';
- }
-
- // Handle text decoration:
- // http://www.w3.org/TR/CSS21/text.html#propdef-text-decoration
-
- // Draw all applicable text-decorations. Start with the root and work our way down.
- $p = $frame;
- $stack = array();
- while ( $p = $p->get_parent() )
- $stack[] = $p;
-
- while ( isset($stack[0]) ) {
- $f = array_pop($stack);
- if ( ($text_deco = $f->get_style()->text_decoration) === "none" )
- continue;
-
- $deco_y = $y; //$line->y;
- $color = $f->get_style()->color;
- switch ($text_deco) {
- default:
- continue;
- case "underline":
- $deco_y += $base - $descent + $size * (self::UNDERLINE_OFFSET - self::DECO_THICKNESS/2);
- break;
- case "overline":
- $deco_y += $size * (self::OVERLINE_OFFSET + self::DECO_THICKNESS/2);
- break;
- case "line-through":
- $deco_y += $base * 0.7 + $size * self::LINETHROUGH_OFFSET;
- break;
- }
- $dx = 0;
- $x1 = $x - self::DECO_EXTENSION;
- $x2 = $x + $width + $dx + self::DECO_EXTENSION;
- $this->_canvas->line($x1, $deco_y, $x2, $deco_y, $color, $size * self::DECO_THICKNESS);
- }
-
- if (DEBUG_LAYOUT && DEBUG_LAYOUT_LINES) {
- $text_width = Font_Metrics::get_text_width($text, $font, $frame_font_size);
- $this->_debug_layout(array($x, $y, $text_width+($line->wc-1)*$word_spacing, $frame_font_size), "orange", array(0.5, 0.5));
- }
- }
- }