<?php
/**
* @package dompdf
* @link https://github.com/dompdf/dompdf
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
namespace Dompdf\Renderer;

use Dompdf\Adapter\CPDF;
use Dompdf\Frame;

/**
* Renders text frames
*
* @package dompdf
*/
class Text extends AbstractRenderer
{
/** Thickness of underline. Screen: 0.08, print: better less, e.g. 0.04 */
const DECO_THICKNESS = 0.02;

//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

/** Relative to bottom of text, as fraction of height */
const UNDERLINE_OFFSET = 0.0;

/** Relative to top of text */
const OVERLINE_OFFSET = 0.0;

/** Relative to centre of text. */
const LINETHROUGH_OFFSET = 0.0;

/** How far to extend lines past either end, in pt */
const DECO_EXTENSION = 0.0;

/**
* @param \Dompdf\FrameDecorator\Text $frame
*/
function render(Frame $frame)
{
$style = $frame->get_style();
$text = $frame->get_text();

if ($text === "") {
return;
}

$this->_set_opacity($frame->get_opacity($style->opacity));

[$x, $y] = $frame->get_position();
$cb = $frame->get_containing_block();

$ml = $style->margin_left;
$pl = $style->padding_left;
$bl = $style->border_left_width;
$x += (float) $style->length_in_pt([$ml, $pl, $bl], $cb["w"]);

$font = $style->font_family;
$size = $style->font_size;
$frame_font_size = $frame->get_dompdf()->getFontMetrics()->getFontHeight($font, $size);
$word_spacing = $frame->get_text_spacing() + $style->word_spacing;
$letter_spacing = $style->letter_spacing;
$width = (float) $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, $letter_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;
}

$line_thickness = $size * self::DECO_THICKNESS;
$underline_offset = $size * self::UNDERLINE_OFFSET;
$overline_offset = $size * self::OVERLINE_OFFSET;
$linethrough_offset = $size * self::LINETHROUGH_OFFSET;
$underline_position = -0.08;

if ($this->_canvas instanceof CPDF) {
$cpdf_font = $this->_canvas->get_cpdf()->fonts[$style->font_family];

if (isset($cpdf_font["UnderlinePosition"])) {
$underline_position = $cpdf_font["UnderlinePosition"] / 1000;
}

if (isset($cpdf_font["UnderlineThickness"])) {
$line_thickness = $size * ($cpdf_font["UnderlineThickness"] / 1000);
}
}

$descent = $size * $underline_position;
$base = $frame_font_size;

// 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;
$stack = [];
while ($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 2;

case "underline":
$deco_y += $base - $descent + $underline_offset + $line_thickness / 2;
break;

case "overline":
$deco_y += $overline_offset + $line_thickness / 2;
break;

case "line-through":
$deco_y += $base * 0.7 + $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, $line_thickness);
}

$options = $this->_dompdf->getOptions();

if ($options->getDebugLayout() && $options->getDebugLayoutLines()) {
$fontMetrics = $this->_dompdf->getFontMetrics();
$textWidth = $fontMetrics->getTextWidth($text, $font, $size, $word_spacing, $letter_spacing);
$this->debugLayout([$x, $y, $textWidth, $frame_font_size], "orange", [0.5, 0.5]);
}
}
}