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Edit File : AbstractRenderer.php \| Size : 28.77 KB
<?php /** * @package dompdf * @link http://dompdf.github.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 / namespace Dompdf\Renderer; use Dompdf\Adapter\CPDF; use Dompdf\Css\Color; use Dompdf\Css\Style; use Dompdf\Dompdf; use Dompdf\Helpers; use Dompdf\Frame; use Dompdf\Image\Cache; /* * Base renderer class * * @package dompdf / abstract class AbstractRenderer { /* * Rendering backend * * @var \Dompdf\Canvas / protected $_canvas; /* * Current dompdf instance * * @var Dompdf / protected $_dompdf; /* * Class constructor * * @param Dompdf $dompdf The current dompdf instance / function __construct(Dompdf $dompdf) { $this->_dompdf = $dompdf; $this->_canvas = $dompdf->getCanvas(); } /* * Render a frame. * * Specialized in child classes * * @param Frame $frame The frame to render / abstract function render(Frame $frame); /* * Render a background image over a rectangular area * * @param string $url The background image to load * @param float $x The left edge of the rectangular area * @param float $y The top edge of the rectangular area * @param float $width The width of the rectangular area * @param float $height The height of the rectangular area * @param Style $style The associated Style object * * @throws \Exception / protected function _background_image($url, $x, $y, $width, $height, $style) { if (!function_exists("imagecreatetruecolor")) { throw new \Exception("The PHP GD extension is required, but is not installed."); } $sheet = $style->get_stylesheet(); // Skip degenerate cases if ($width == 0 \|\| $height == 0) { return; } $box_width = $width; $box_height = $height; //debugpng if ($this->_dompdf->getOptions()->getDebugPng()) { print '[_background_image ' . $url . ']'; } list($img, $type, /$msg/) = Cache::resolve_url( $url, $sheet->get_protocol(), $sheet->get_host(), $sheet->get_base_path(), $this->_dompdf ); // Bail if the image is no good if (Cache::is_broken($img)) { return; } //Try to optimize away reading and composing of same background multiple times //Postponing read with imagecreatefrom ...() //final composition parameters and name not known yet //Therefore read dimension directly from file, instead of creating gd object first. //$img_w = imagesx($src); $img_h = imagesy($src); list($img_w, $img_h) = Helpers::dompdf_getimagesize($img, $this->_dompdf->getHttpContext()); if (!isset($img_w) \|\| $img_w == 0 \|\| !isset($img_h) \|\| $img_h == 0) { return; } $repeat = $style->background_repeat; $dpi = $this->_dompdf->getOptions()->getDpi(); //Increase background resolution and dependent box size according to image resolution to be placed in //Then image can be copied in without resize $bg_width = round((float)($width $dpi) / 72); $bg_height = round((float)($height * $dpi) / 72); //Need %bg_x, $bg_y as background pos, where img starts, converted to pixel list($bg_x, $bg_y) = $style->background_position; if (Helpers::is_percent($bg_x)) { // The point $bg_x % from the left edge of the image is placed // $bg_x % from the left edge of the background rectangle $p = ((float)$bg_x) / 100.0; $x1 = $p * $img_w; $x2 = $p * $bg_width; $bg_x = $x2 - $x1; } else { $bg_x = (float)($style->length_in_pt($bg_x) * $dpi) / 72; } $bg_x = round($bg_x + (float)$style->length_in_pt($style->border_left_width) * $dpi / 72); if (Helpers::is_percent($bg_y)) { // The point $bg_y % from the left edge of the image is placed // $bg_y % from the left edge of the background rectangle $p = ((float)$bg_y) / 100.0; $y1 = $p * $img_h; $y2 = $p * $bg_height; $bg_y = $y2 - $y1; } else { $bg_y = (float)($style->length_in_pt($bg_y) * $dpi) / 72; } $bg_y = round($bg_y + (float)$style->length_in_pt($style->border_top_width) * $dpi / 72); //clip background to the image area on partial repeat. Nothing to do if img off area //On repeat, normalize start position to the tile at immediate left/top or 0/0 of area //On no repeat with positive offset: move size/start to have offset==0 //Handle x/y Dimensions separately if ($repeat !== "repeat" && $repeat !== "repeat-x") { //No repeat x if ($bg_x < 0) { $bg_width = $img_w + $bg_x; } else { $x += ($bg_x * 72) / $dpi; $bg_width = $bg_width - $bg_x; if ($bg_width > $img_w) { $bg_width = $img_w; } $bg_x = 0; } if ($bg_width <= 0) { return; } $width = (float)($bg_width * 72) / $dpi; } else { //repeat x if ($bg_x < 0) { $bg_x = -((-$bg_x) % $img_w); } else { $bg_x = $bg_x % $img_w; if ($bg_x > 0) { $bg_x -= $img_w; } } } if ($repeat !== "repeat" && $repeat !== "repeat-y") { //no repeat y if ($bg_y < 0) { $bg_height = $img_h + $bg_y; } else { $y += ($bg_y * 72) / $dpi; $bg_height = $bg_height - $bg_y; if ($bg_height > $img_h) { $bg_height = $img_h; } $bg_y = 0; } if ($bg_height <= 0) { return; } $height = (float)($bg_height * 72) / $dpi; } else { //repeat y if ($bg_y < 0) { $bg_y = -((-$bg_y) % $img_h); } else { $bg_y = $bg_y % $img_h; if ($bg_y > 0) { $bg_y -= $img_h; } } } //Optimization, if repeat has no effect if ($repeat === "repeat" && $bg_y <= 0 && $img_h + $bg_y >= $bg_height) { $repeat = "repeat-x"; } if ($repeat === "repeat" && $bg_x <= 0 && $img_w + $bg_x >= $bg_width) { $repeat = "repeat-y"; } if (($repeat === "repeat-x" && $bg_x <= 0 && $img_w + $bg_x >= $bg_width) \|\| ($repeat === "repeat-y" && $bg_y <= 0 && $img_h + $bg_y >= $bg_height) ) { $repeat = "no-repeat"; } //Use filename as indicator only //different names for different variants to have different copies in the pdf //This is not dependent of background color of box! .'_'.(is_array($bg_color) ? $bg_color["hex"] : $bg_color) //Note: Here, bg_* are the start values, not end values after going through the tile loops! $filedummy = $img; $is_png = false; $filedummy .= '_' . $bg_width . '_' . $bg_height . '_' . $bg_x . '_' . $bg_y . '_' . $repeat; //Optimization to avoid multiple times rendering the same image. //If check functions are existing and identical image already cached, //then skip creation of duplicate, because it is not needed by addImagePng if ($this->_canvas instanceof CPDF && $this->_canvas->get_cpdf()->image_iscached($filedummy)) { $bg = null; } else { // Create a new image to fit over the background rectangle $bg = imagecreatetruecolor($bg_width, $bg_height); switch (strtolower($type)) { case "png": $is_png = true; imagesavealpha($bg, true); imagealphablending($bg, false); $src = imagecreatefrompng($img); break; case "jpeg": $src = imagecreatefromjpeg($img); break; case "gif": $src = imagecreatefromgif($img); break; case "bmp": $src = Helpers::imagecreatefrombmp($img); break; default: return; // Unsupported image type } if ($src == null) { return; } //Background color if box is not relevant here //Non transparent image: box clipped to real size. Background non relevant. //Transparent image: The image controls the transparency and lets shine through whatever background. //However on transparent image preset the composed image with the transparency color, //to keep the transparency when copying over the non transparent parts of the tiles. $ti = imagecolortransparent($src); $palletsize = imagecolorstotal($src); if ($ti >= 0 && $ti < $palletsize) { $tc = imagecolorsforindex($src, $ti); $ti = imagecolorallocate($bg, $tc['red'], $tc['green'], $tc['blue']); imagefill($bg, 0, 0, $ti); imagecolortransparent($bg, $ti); } //This has only an effect for the non repeatable dimension. //compute start of src and dest coordinates of the single copy if ($bg_x < 0) { $dst_x = 0; $src_x = -$bg_x; } else { $src_x = 0; $dst_x = $bg_x; } if ($bg_y < 0) { $dst_y = 0; $src_y = -$bg_y; } else { $src_y = 0; $dst_y = $bg_y; } //For historical reasons exchange meanings of variables: //start_* will be the start values, while bg_* will be the temporary start values in the loops $start_x = $bg_x; $start_y = $bg_y; // Copy regions from the source image to the background if ($repeat === "no-repeat") { // Simply place the image on the background imagecopy($bg, $src, $dst_x, $dst_y, $src_x, $src_y, $img_w, $img_h); } else if ($repeat === "repeat-x") { for ($bg_x = $start_x; $bg_x < $bg_width; $bg_x += $img_w) { if ($bg_x < 0) { $dst_x = 0; $src_x = -$bg_x; $w = $img_w + $bg_x; } else { $dst_x = $bg_x; $src_x = 0; $w = $img_w; } imagecopy($bg, $src, $dst_x, $dst_y, $src_x, $src_y, $w, $img_h); } } else if ($repeat === "repeat-y") { for ($bg_y = $start_y; $bg_y < $bg_height; $bg_y += $img_h) { if ($bg_y < 0) { $dst_y = 0; $src_y = -$bg_y; $h = $img_h + $bg_y; } else { $dst_y = $bg_y; $src_y = 0; $h = $img_h; } imagecopy($bg, $src, $dst_x, $dst_y, $src_x, $src_y, $img_w, $h); } } else if ($repeat === "repeat") { for ($bg_y = $start_y; $bg_y < $bg_height; $bg_y += $img_h) { for ($bg_x = $start_x; $bg_x < $bg_width; $bg_x += $img_w) { if ($bg_x < 0) { $dst_x = 0; $src_x = -$bg_x; $w = $img_w + $bg_x; } else { $dst_x = $bg_x; $src_x = 0; $w = $img_w; } if ($bg_y < 0) { $dst_y = 0; $src_y = -$bg_y; $h = $img_h + $bg_y; } else { $dst_y = $bg_y; $src_y = 0; $h = $img_h; } imagecopy($bg, $src, $dst_x, $dst_y, $src_x, $src_y, $w, $h); } } } else { print 'Unknown repeat!'; } imagedestroy($src); } /* End optimize away creation of duplicates / $this->_canvas->clipping_rectangle($x, $y, $box_width, $box_height); //img: image url string //img_w, img_h: original image size in px //width, height: box size in pt //bg_width, bg_height: box size in px //x, y: left/top edge of box on page in pt //start_x, start_y: placement of image relative to pattern //$repeat: repeat mode //$bg: GD object of result image //$src: GD object of original image //When using cpdf and optimization to direct png creation from gd object is available, //don't create temp file, but place gd object directly into the pdf if (!$is_png && $this->_canvas instanceof CPDF) { // Note: CPDF_Adapter image converts y position $this->_canvas->get_cpdf()->addImagePng($filedummy, $x, $this->_canvas->get_height() - $y - $height, $width, $height, $bg); } else { $tmp_dir = $this->_dompdf->getOptions()->getTempDir(); $tmp_name = @tempnam($tmp_dir, "bg_dompdf_img_"); @unlink($tmp_name); $tmp_file = "$tmp_name.png"; //debugpng if ($this->_dompdf->getOptions()->getDebugPng()) { print '[_background_image ' . $tmp_file . ']'; } imagepng($bg, $tmp_file); $this->_canvas->image($tmp_file, $x, $y, $width, $height); imagedestroy($bg); //debugpng if ($this->_dompdf->getOptions()->getDebugPng()) { print '[_background_image unlink ' . $tmp_file . ']'; } if (!$this->_dompdf->getOptions()->getDebugKeepTemp()) { unlink($tmp_file); } } $this->_canvas->clipping_end(); } /* * @param $style * @param $width * @return array / protected function _get_dash_pattern($style, $width) { $pattern = array(); switch ($style) { default: /case "solid": case "double": case "groove": case "inset": case "outset": case "ridge":/ case "none": break; case "dotted": if ($width <= 1) { $pattern = array($width, $width 2); } else { $pattern = array($width); } break; case "dashed": $pattern = array(3 * $width); break; } return $pattern; } /** * @param $x * @param $y * @param $length * @param $color * @param $widths * @param $side * @param string $corner_style * @param int $r1 * @param int $r2 / protected function _border_none($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0) { return; } /* * @param $x * @param $y * @param $length * @param $color * @param $widths * @param $side * @param string $corner_style * @param int $r1 * @param int $r2 / protected function _border_hidden($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0) { return; } // Border rendering functions /* * @param $x * @param $y * @param $length * @param $color * @param $widths * @param $side * @param string $corner_style * @param int $r1 * @param int $r2 / protected function _border_dotted($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0) { $this->_border_line($x, $y, $length, $color, $widths, $side, $corner_style, "dotted", $r1, $r2); } /* * @param $x * @param $y * @param $length * @param $color * @param $widths * @param $side * @param string $corner_style * @param int $r1 * @param int $r2 / protected function _border_dashed($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0) { $this->_border_line($x, $y, $length, $color, $widths, $side, $corner_style, "dashed", $r1, $r2); } /* * @param $x * @param $y * @param $length * @param $color * @param $widths * @param $side * @param string $corner_style * @param int $r1 * @param int $r2 / protected function _border_solid($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0) { // TODO: Solve rendering where one corner is beveled (radius == 0), one corner isn't. if ($corner_style !== "bevel" \|\| $r1 > 0 \|\| $r2 > 0) { // do it the simple way $this->_border_line($x, $y, $length, $color, $widths, $side, $corner_style, "solid", $r1, $r2); return; } list($top, $right, $bottom, $left) = $widths; // All this polygon business is for beveled corners... switch ($side) { case "top": $points = array($x, $y, $x + $length, $y, $x + $length - $right, $y + $top, $x + $left, $y + $top); $this->_canvas->polygon($points, $color, null, null, true); break; case "bottom": $points = array($x, $y, $x + $length, $y, $x + $length - $right, $y - $bottom, $x + $left, $y - $bottom); $this->_canvas->polygon($points, $color, null, null, true); break; case "left": $points = array($x, $y, $x, $y + $length, $x + $left, $y + $length - $bottom, $x + $left, $y + $top); $this->_canvas->polygon($points, $color, null, null, true); break; case "right": $points = array($x, $y, $x, $y + $length, $x - $right, $y + $length - $bottom, $x - $right, $y + $top); $this->_canvas->polygon($points, $color, null, null, true); break; default: return; } } /* * @param $side * @param $ratio * @param $top * @param $right * @param $bottom * @param $left * @param $x * @param $y * @param $length * @param $r1 * @param $r2 / protected function _apply_ratio($side, $ratio, $top, $right, $bottom, $left, &$x, &$y, &$length, &$r1, &$r2) { switch ($side) { case "top": $r1 -= $left $ratio; $r2 -= $right * $ratio; $x += $left * $ratio; $y += $top * $ratio; $length -= $left * $ratio + $right * $ratio; break; case "bottom": $r1 -= $right * $ratio; $r2 -= $left * $ratio; $x += $left * $ratio; $y -= $bottom * $ratio; $length -= $left * $ratio + $right * $ratio; break; case "left": $r1 -= $top * $ratio; $r2 -= $bottom * $ratio; $x += $left * $ratio; $y += $top * $ratio; $length -= $top * $ratio + $bottom * $ratio; break; case "right": $r1 -= $bottom * $ratio; $r2 -= $top * $ratio; $x -= $right * $ratio; $y += $top * $ratio; $length -= $top * $ratio + $bottom * $ratio; break; default: return; } } /** * @param $x * @param $y * @param $length * @param $color * @param $widths * @param $side * @param string $corner_style * @param int $r1 * @param int $r2 / protected function _border_double($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0) { list($top, $right, $bottom, $left) = $widths; $third_widths = array($top / 3, $right / 3, $bottom / 3, $left / 3); // draw the outer border $this->_border_solid($x, $y, $length, $color, $third_widths, $side, $corner_style, $r1, $r2); $this->_apply_ratio($side, 2 / 3, $top, $right, $bottom, $left, $x, $y, $length, $r1, $r2); $this->_border_solid($x, $y, $length, $color, $third_widths, $side, $corner_style, $r1, $r2); } /* * @param $x * @param $y * @param $length * @param $color * @param $widths * @param $side * @param string $corner_style * @param int $r1 * @param int $r2 / protected function _border_groove($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0) { list($top, $right, $bottom, $left) = $widths; $half_widths = array($top / 2, $right / 2, $bottom / 2, $left / 2); $this->_border_inset($x, $y, $length, $color, $half_widths, $side, $corner_style, $r1, $r2); $this->_apply_ratio($side, 0.5, $top, $right, $bottom, $left, $x, $y, $length, $r1, $r2); $this->_border_outset($x, $y, $length, $color, $half_widths, $side, $corner_style, $r1, $r2); } /* * @param $x * @param $y * @param $length * @param $color * @param $widths * @param $side * @param string $corner_style * @param int $r1 * @param int $r2 / protected function _border_ridge($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0) { list($top, $right, $bottom, $left) = $widths; $half_widths = array($top / 2, $right / 2, $bottom / 2, $left / 2); $this->_border_outset($x, $y, $length, $color, $half_widths, $side, $corner_style, $r1, $r2); $this->_apply_ratio($side, 0.5, $top, $right, $bottom, $left, $x, $y, $length, $r1, $r2); $this->_border_inset($x, $y, $length, $color, $half_widths, $side, $corner_style, $r1, $r2); } /* * @param $c * @return mixed / protected function _tint($c) { if (!is_numeric($c)) { return $c; } return min(1, $c + 0.16); } /* * @param $c * @return mixed / protected function _shade($c) { if (!is_numeric($c)) { return $c; } return max(0, $c - 0.33); } /* * @param $x * @param $y * @param $length * @param $color * @param $widths * @param $side * @param string $corner_style * @param int $r1 * @param int $r2 / protected function _border_inset($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0) { switch ($side) { case "top": case "left": $shade = array_map(array($this, "_shade"), $color); $this->_border_solid($x, $y, $length, $shade, $widths, $side, $corner_style, $r1, $r2); break; case "bottom": case "right": $tint = array_map(array($this, "_tint"), $color); $this->_border_solid($x, $y, $length, $tint, $widths, $side, $corner_style, $r1, $r2); break; default: return; } } /* * @param $x * @param $y * @param $length * @param $color * @param $widths * @param $side * @param string $corner_style * @param int $r1 * @param int $r2 / protected function _border_outset($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0) { switch ($side) { case "top": case "left": $tint = array_map(array($this, "_tint"), $color); $this->_border_solid($x, $y, $length, $tint, $widths, $side, $corner_style, $r1, $r2); break; case "bottom": case "right": $shade = array_map(array($this, "_shade"), $color); $this->_border_solid($x, $y, $length, $shade, $widths, $side, $corner_style, $r1, $r2); break; default: return; } } /* * Draws a solid, dotted, or dashed line, observing the border radius * * @param $x * @param $y * @param $length * @param $color * @param $widths * @param $side * @param string $corner_style * @param $pattern_name * @param int $r1 * @param int $r2 * * @var $top / protected function _border_line($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $pattern_name, $r1 = 0, $r2 = 0) { /* used by $$side / list($top, $right, $bottom, $left) = $widths; $width = $$side; $pattern = $this->_get_dash_pattern($pattern_name, $width); $half_width = $width / 2; $r1 -= $half_width; $r2 -= $half_width; $adjust = $r1 / 80; $length -= $width; switch ($side) { case "top": $x += $half_width; $y += $half_width; if ($r1 > 0) { $this->_canvas->arc($x + $r1, $y + $r1, $r1, $r1, 90 - $adjust, 135 + $adjust, $color, $width, $pattern); } $this->_canvas->line($x + $r1, $y, $x + $length - $r2, $y, $color, $width, $pattern); if ($r2 > 0) { $this->_canvas->arc($x + $length - $r2, $y + $r2, $r2, $r2, 45 - $adjust, 90 + $adjust, $color, $width, $pattern); } break; case "bottom": $x += $half_width; $y -= $half_width; if ($r1 > 0) { $this->_canvas->arc($x + $r1, $y - $r1, $r1, $r1, 225 - $adjust, 270 + $adjust, $color, $width, $pattern); } $this->_canvas->line($x + $r1, $y, $x + $length - $r2, $y, $color, $width, $pattern); if ($r2 > 0) { $this->_canvas->arc($x + $length - $r2, $y - $r2, $r2, $r2, 270 - $adjust, 315 + $adjust, $color, $width, $pattern); } break; case "left": $y += $half_width; $x += $half_width; if ($r1 > 0) { $this->_canvas->arc($x + $r1, $y + $r1, $r1, $r1, 135 - $adjust, 180 + $adjust, $color, $width, $pattern); } $this->_canvas->line($x, $y + $r1, $x, $y + $length - $r2, $color, $width, $pattern); if ($r2 > 0) { $this->_canvas->arc($x + $r2, $y + $length - $r2, $r2, $r2, 180 - $adjust, 225 + $adjust, $color, $width, $pattern); } break; case "right": $y += $half_width; $x -= $half_width; if ($r1 > 0) { $this->_canvas->arc($x - $r1, $y + $r1, $r1, $r1, 0 - $adjust, 45 + $adjust, $color, $width, $pattern); } $this->_canvas->line($x, $y + $r1, $x, $y + $length - $r2, $color, $width, $pattern); if ($r2 > 0) { $this->_canvas->arc($x - $r2, $y + $length - $r2, $r2, $r2, 315 - $adjust, 360 + $adjust, $color, $width, $pattern); } break; } } /* * @param $opacity / protected function _set_opacity($opacity) { if (is_numeric($opacity) && $opacity <= 1.0 && $opacity >= 0.0) { $this->_canvas->set_opacity($opacity); } } /* * @param $box * @param string $color * @param array $style */ protected function _debug_layout($box, $color = "red", $style = array()) { $this->_canvas->rectangle($box[0], $box[1], $box[2], $box[3], Color::parse($color), 0.1, $style); } } Back

Edit File : AbstractRenderer.php | Size : 28.77 KB

<?php
/**
 * @package dompdf
 * @link    http://dompdf.github.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
 */
namespace Dompdf\Renderer;

use Dompdf\Adapter\CPDF;
use Dompdf\Css\Color;
use Dompdf\Css\Style;
use Dompdf\Dompdf;
use Dompdf\Helpers;
use Dompdf\Frame;
use Dompdf\Image\Cache;

/**
 * Base renderer class
 *
 * @package dompdf
 */
abstract class AbstractRenderer
{

/**
     * Rendering backend
     *
     * @var \Dompdf\Canvas
     */
    protected $_canvas;

/**
     * Current dompdf instance
     *
     * @var Dompdf
     */
    protected $_dompdf;

/**
     * Class constructor
     *
     * @param Dompdf $dompdf The current dompdf instance
     */
    function __construct(Dompdf $dompdf)
    {
        $this->_dompdf = $dompdf;
        $this->_canvas = $dompdf->getCanvas();
    }

/**
     * Render a frame.
     *
     * Specialized in child classes
     *
     * @param Frame $frame The frame to render
     */
    abstract function render(Frame $frame);

/**
     * Render a background image over a rectangular area
     *
     * @param string $url   The background image to load
     * @param float $x      The left edge of the rectangular area
     * @param float $y      The top edge of the rectangular area
     * @param float $width  The width of the rectangular area
     * @param float $height The height of the rectangular area
     * @param Style $style  The associated Style object
     *
     * @throws \Exception
     */
    protected function _background_image($url, $x, $y, $width, $height, $style)
    {
        if (!function_exists("imagecreatetruecolor")) {
            throw new \Exception("The PHP GD extension is required, but is not installed.");
        }

$sheet = $style->get_stylesheet();

// Skip degenerate cases
        if ($width == 0 || $height == 0) {
            return;
        }

$box_width = $width;
        $box_height = $height;

//debugpng
        if ($this->_dompdf->getOptions()->getDebugPng()) {
            print '[_background_image ' . $url . ']';
        }

list($img, $type, /*$msg*/) = Cache::resolve_url(
            $url,
            $sheet->get_protocol(),
            $sheet->get_host(),
            $sheet->get_base_path(),
            $this->_dompdf
        );

// Bail if the image is no good
        if (Cache::is_broken($img)) {
            return;
        }

//Try to optimize away reading and composing of same background multiple times
        //Postponing read with imagecreatefrom   ...()
        //final composition parameters and name not known yet
        //Therefore read dimension directly from file, instead of creating gd object first.
        //$img_w = imagesx($src); $img_h = imagesy($src);

list($img_w, $img_h) = Helpers::dompdf_getimagesize($img, $this->_dompdf->getHttpContext());
        if (!isset($img_w) || $img_w == 0 || !isset($img_h) || $img_h == 0) {
            return;
        }

$repeat = $style->background_repeat;
        $dpi = $this->_dompdf->getOptions()->getDpi();

//Increase background resolution and dependent box size according to image resolution to be placed in
        //Then image can be copied in without resize
        $bg_width = round((float)($width * $dpi) / 72);
        $bg_height = round((float)($height * $dpi) / 72);

//Need %bg_x, $bg_y as background pos, where img starts, converted to pixel

list($bg_x, $bg_y) = $style->background_position;

if (Helpers::is_percent($bg_x)) {
            // The point $bg_x % from the left edge of the image is placed
            // $bg_x % from the left edge of the background rectangle
            $p = ((float)$bg_x) / 100.0;
            $x1 = $p * $img_w;
            $x2 = $p * $bg_width;

$bg_x = $x2 - $x1;
        } else {
            $bg_x = (float)($style->length_in_pt($bg_x) * $dpi) / 72;
        }

$bg_x = round($bg_x + (float)$style->length_in_pt($style->border_left_width) * $dpi / 72);

if (Helpers::is_percent($bg_y)) {
            // The point $bg_y % from the left edge of the image is placed
            // $bg_y % from the left edge of the background rectangle
            $p = ((float)$bg_y) / 100.0;
            $y1 = $p * $img_h;
            $y2 = $p * $bg_height;

$bg_y = $y2 - $y1;
        } else {
            $bg_y = (float)($style->length_in_pt($bg_y) * $dpi) / 72;
        }

$bg_y = round($bg_y + (float)$style->length_in_pt($style->border_top_width) * $dpi / 72);

//clip background to the image area on partial repeat. Nothing to do if img off area
        //On repeat, normalize start position to the tile at immediate left/top or 0/0 of area
        //On no repeat with positive offset: move size/start to have offset==0
        //Handle x/y Dimensions separately

if ($repeat !== "repeat" && $repeat !== "repeat-x") {
            //No repeat x
            if ($bg_x < 0) {
                $bg_width = $img_w + $bg_x;
            } else {
                $x += ($bg_x * 72) / $dpi;
                $bg_width = $bg_width - $bg_x;
                if ($bg_width > $img_w) {
                    $bg_width = $img_w;
                }
                $bg_x = 0;
            }

if ($bg_width <= 0) {
                return;
            }

$width = (float)($bg_width * 72) / $dpi;
        } else {
            //repeat x
            if ($bg_x < 0) {
                $bg_x = -((-$bg_x) % $img_w);
            } else {
                $bg_x = $bg_x % $img_w;
                if ($bg_x > 0) {
                    $bg_x -= $img_w;
                }
            }
        }

if ($repeat !== "repeat" && $repeat !== "repeat-y") {
            //no repeat y
            if ($bg_y < 0) {
                $bg_height = $img_h + $bg_y;
            } else {
                $y += ($bg_y * 72) / $dpi;
                $bg_height = $bg_height - $bg_y;
                if ($bg_height > $img_h) {
                    $bg_height = $img_h;
                }
                $bg_y = 0;
            }
            if ($bg_height <= 0) {
                return;
            }
            $height = (float)($bg_height * 72) / $dpi;
        } else {
            //repeat y
            if ($bg_y < 0) {
                $bg_y = -((-$bg_y) % $img_h);
            } else {
                $bg_y = $bg_y % $img_h;
                if ($bg_y > 0) {
                    $bg_y -= $img_h;
                }
            }
        }

//Optimization, if repeat has no effect
        if ($repeat === "repeat" && $bg_y <= 0 && $img_h + $bg_y >= $bg_height) {
            $repeat = "repeat-x";
        }

if ($repeat === "repeat" && $bg_x <= 0 && $img_w + $bg_x >= $bg_width) {
            $repeat = "repeat-y";
        }

if (($repeat === "repeat-x" && $bg_x <= 0 && $img_w + $bg_x >= $bg_width) ||
            ($repeat === "repeat-y" && $bg_y <= 0 && $img_h + $bg_y >= $bg_height)
        ) {
            $repeat = "no-repeat";
        }

//Use filename as indicator only
        //different names for different variants to have different copies in the pdf
        //This is not dependent of background color of box! .'_'.(is_array($bg_color) ? $bg_color["hex"] : $bg_color)
        //Note: Here, bg_* are the start values, not end values after going through the tile loops!

$filedummy = $img;

$is_png = false;
        $filedummy .= '_' . $bg_width . '_' . $bg_height . '_' . $bg_x . '_' . $bg_y . '_' . $repeat;

//Optimization to avoid multiple times rendering the same image.
        //If check functions are existing and identical image already cached,
        //then skip creation of duplicate, because it is not needed by addImagePng
        if ($this->_canvas instanceof CPDF && $this->_canvas->get_cpdf()->image_iscached($filedummy)) {
            $bg = null;
        } else {
            // Create a new image to fit over the background rectangle
            $bg = imagecreatetruecolor($bg_width, $bg_height);

switch (strtolower($type)) {
                case "png":
                    $is_png = true;
                    imagesavealpha($bg, true);
                    imagealphablending($bg, false);
                    $src = imagecreatefrompng($img);
                    break;

case "jpeg":
                    $src = imagecreatefromjpeg($img);
                    break;

case "gif":
                    $src = imagecreatefromgif($img);
                    break;

case "bmp":
                    $src = Helpers::imagecreatefrombmp($img);
                    break;

default:
                    return; // Unsupported image type
            }

if ($src == null) {
                return;
            }

//Background color if box is not relevant here
            //Non transparent image: box clipped to real size. Background non relevant.
            //Transparent image: The image controls the transparency and lets shine through whatever background.
            //However on transparent image preset the composed image with the transparency color,
            //to keep the transparency when copying over the non transparent parts of the tiles.
            $ti = imagecolortransparent($src);
            $palletsize = imagecolorstotal($src);

if ($ti >= 0 && $ti < $palletsize) {
                $tc = imagecolorsforindex($src, $ti);
                $ti = imagecolorallocate($bg, $tc['red'], $tc['green'], $tc['blue']);
                imagefill($bg, 0, 0, $ti);
                imagecolortransparent($bg, $ti);
            }

//This has only an effect for the non repeatable dimension.
            //compute start of src and dest coordinates of the single copy
            if ($bg_x < 0) {
                $dst_x = 0;
                $src_x = -$bg_x;
            } else {
                $src_x = 0;
                $dst_x = $bg_x;
            }

if ($bg_y < 0) {
                $dst_y = 0;
                $src_y = -$bg_y;
            } else {
                $src_y = 0;
                $dst_y = $bg_y;
            }

//For historical reasons exchange meanings of variables:
            //start_* will be the start values, while bg_* will be the temporary start values in the loops
            $start_x = $bg_x;
            $start_y = $bg_y;

// Copy regions from the source image to the background
            if ($repeat === "no-repeat") {
                // Simply place the image on the background
                imagecopy($bg, $src, $dst_x, $dst_y, $src_x, $src_y, $img_w, $img_h);

} else if ($repeat === "repeat-x") {
                for ($bg_x = $start_x; $bg_x < $bg_width; $bg_x += $img_w) {
                    if ($bg_x < 0) {
                        $dst_x = 0;
                        $src_x = -$bg_x;
                        $w = $img_w + $bg_x;
                    } else {
                        $dst_x = $bg_x;
                        $src_x = 0;
                        $w = $img_w;
                    }
                    imagecopy($bg, $src, $dst_x, $dst_y, $src_x, $src_y, $w, $img_h);
                }
            } else if ($repeat === "repeat-y") {

for ($bg_y = $start_y; $bg_y < $bg_height; $bg_y += $img_h) {
                    if ($bg_y < 0) {
                        $dst_y = 0;
                        $src_y = -$bg_y;
                        $h = $img_h + $bg_y;
                    } else {
                        $dst_y = $bg_y;
                        $src_y = 0;
                        $h = $img_h;
                    }
                    imagecopy($bg, $src, $dst_x, $dst_y, $src_x, $src_y, $img_w, $h);
                }
            } else if ($repeat === "repeat") {
                for ($bg_y = $start_y; $bg_y < $bg_height; $bg_y += $img_h) {
                    for ($bg_x = $start_x; $bg_x < $bg_width; $bg_x += $img_w) {
                        if ($bg_x < 0) {
                            $dst_x = 0;
                            $src_x = -$bg_x;
                            $w = $img_w + $bg_x;
                        } else {
                            $dst_x = $bg_x;
                            $src_x = 0;
                            $w = $img_w;
                        }

if ($bg_y < 0) {
                            $dst_y = 0;
                            $src_y = -$bg_y;
                            $h = $img_h + $bg_y;
                        } else {
                            $dst_y = $bg_y;
                            $src_y = 0;
                            $h = $img_h;
                        }
                        imagecopy($bg, $src, $dst_x, $dst_y, $src_x, $src_y, $w, $h);
                    }
                }
            } else {
                print 'Unknown repeat!';
            }

imagedestroy($src);

} /* End optimize away creation of duplicates */

$this->_canvas->clipping_rectangle($x, $y, $box_width, $box_height);

//img: image url string
        //img_w, img_h: original image size in px
        //width, height: box size in pt
        //bg_width, bg_height: box size in px
        //x, y: left/top edge of box on page in pt
        //start_x, start_y: placement of image relative to pattern
        //$repeat: repeat mode
        //$bg: GD object of result image
        //$src: GD object of original image
        //When using cpdf and optimization to direct png creation from gd object is available,
        //don't create temp file, but place gd object directly into the pdf
        if (!$is_png && $this->_canvas instanceof CPDF) {
            // Note: CPDF_Adapter image converts y position
            $this->_canvas->get_cpdf()->addImagePng($filedummy, $x, $this->_canvas->get_height() - $y - $height, $width, $height, $bg);
        } else {
            $tmp_dir = $this->_dompdf->getOptions()->getTempDir();
            $tmp_name = @tempnam($tmp_dir, "bg_dompdf_img_");
            @unlink($tmp_name);
            $tmp_file = "$tmp_name.png";

//debugpng
            if ($this->_dompdf->getOptions()->getDebugPng()) {
                print '[_background_image ' . $tmp_file . ']';
            }

imagepng($bg, $tmp_file);
            $this->_canvas->image($tmp_file, $x, $y, $width, $height);
            imagedestroy($bg);

//debugpng
            if ($this->_dompdf->getOptions()->getDebugPng()) {
                print '[_background_image unlink ' . $tmp_file . ']';
            }

if (!$this->_dompdf->getOptions()->getDebugKeepTemp()) {
                unlink($tmp_file);
            }
        }

$this->_canvas->clipping_end();
    }

/**
     * @param $style
     * @param $width
     * @return array
     */
    protected function _get_dash_pattern($style, $width)
    {
        $pattern = array();

switch ($style) {
            default:
                /*case "solid":
                case "double":
                case "groove":
                case "inset":
                case "outset":
                case "ridge":*/
            case "none":
                break;

case "dotted":
                if ($width <= 1) {
                    $pattern = array($width, $width * 2);
                } else {
                    $pattern = array($width);
                }
                break;

case "dashed":
                $pattern = array(3 * $width);
                break;
        }

return $pattern;
    }

// Border rendering functions

/**
     * @param $x
     * @param $y
     * @param $length
     * @param $color
     * @param $widths
     * @param $side
     * @param string $corner_style
     * @param int $r1
     * @param int $r2
     */
    protected function _border_solid($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0)
    {
        // TODO: Solve rendering where one corner is beveled (radius == 0), one corner isn't.
        if ($corner_style !== "bevel" || $r1 > 0 || $r2 > 0) {
            // do it the simple way
            $this->_border_line($x, $y, $length, $color, $widths, $side, $corner_style, "solid", $r1, $r2);
            return;
        }

list($top, $right, $bottom, $left) = $widths;

// All this polygon business is for beveled corners...
        switch ($side) {
            case "top":
                $points = array($x, $y,
                    $x + $length, $y,
                    $x + $length - $right, $y + $top,
                    $x + $left, $y + $top);
                $this->_canvas->polygon($points, $color, null, null, true);
                break;

case "bottom":
                $points = array($x, $y,
                    $x + $length, $y,
                    $x + $length - $right, $y - $bottom,
                    $x + $left, $y - $bottom);
                $this->_canvas->polygon($points, $color, null, null, true);
                break;

case "left":
                $points = array($x, $y,
                    $x, $y + $length,
                    $x + $left, $y + $length - $bottom,
                    $x + $left, $y + $top);
                $this->_canvas->polygon($points, $color, null, null, true);
                break;

case "right":
                $points = array($x, $y,
                    $x, $y + $length,
                    $x - $right, $y + $length - $bottom,
                    $x - $right, $y + $top);
                $this->_canvas->polygon($points, $color, null, null, true);
                break;

default:
                return;
        }
    }

/**
     * @param $side
     * @param $ratio
     * @param $top
     * @param $right
     * @param $bottom
     * @param $left
     * @param $x
     * @param $y
     * @param $length
     * @param $r1
     * @param $r2
     */
    protected function _apply_ratio($side, $ratio, $top, $right, $bottom, $left, &$x, &$y, &$length, &$r1, &$r2)
    {
        switch ($side) {
            case "top":
                $r1 -= $left * $ratio;
                $r2 -= $right * $ratio;
                $x += $left * $ratio;
                $y += $top * $ratio;
                $length -= $left * $ratio + $right * $ratio;
                break;

case "bottom":
                $r1 -= $right * $ratio;
                $r2 -= $left * $ratio;
                $x += $left * $ratio;
                $y -= $bottom * $ratio;
                $length -= $left * $ratio + $right * $ratio;
                break;

case "left":
                $r1 -= $top * $ratio;
                $r2 -= $bottom * $ratio;
                $x += $left * $ratio;
                $y += $top * $ratio;
                $length -= $top * $ratio + $bottom * $ratio;
                break;

case "right":
                $r1 -= $bottom * $ratio;
                $r2 -= $top * $ratio;
                $x -= $right * $ratio;
                $y += $top * $ratio;
                $length -= $top * $ratio + $bottom * $ratio;
                break;

default:
                return;
        }
    }

$third_widths = array($top / 3, $right / 3, $bottom / 3, $left / 3);

// draw the outer border
        $this->_border_solid($x, $y, $length, $color, $third_widths, $side, $corner_style, $r1, $r2);

$this->_apply_ratio($side, 2 / 3, $top, $right, $bottom, $left, $x, $y, $length, $r1, $r2);

$this->_border_solid($x, $y, $length, $color, $third_widths, $side, $corner_style, $r1, $r2);
    }

$half_widths = array($top / 2, $right / 2, $bottom / 2, $left / 2);

$this->_border_inset($x, $y, $length, $color, $half_widths, $side, $corner_style, $r1, $r2);

$this->_apply_ratio($side, 0.5, $top, $right, $bottom, $left, $x, $y, $length, $r1, $r2);

$this->_border_outset($x, $y, $length, $color, $half_widths, $side, $corner_style, $r1, $r2);
    }

$half_widths = array($top / 2, $right / 2, $bottom / 2, $left / 2);

$this->_border_outset($x, $y, $length, $color, $half_widths, $side, $corner_style, $r1, $r2);

$this->_apply_ratio($side, 0.5, $top, $right, $bottom, $left, $x, $y, $length, $r1, $r2);

$this->_border_inset($x, $y, $length, $color, $half_widths, $side, $corner_style, $r1, $r2);
    }

/**
     * @param $c
     * @return mixed
     */
    protected function _tint($c)
    {
        if (!is_numeric($c)) {
            return $c;
        }

return min(1, $c + 0.16);
    }

/**
     * @param $c
     * @return mixed
     */
    protected function _shade($c)
    {
        if (!is_numeric($c)) {
            return $c;
        }

return max(0, $c - 0.33);
    }

/**
     * @param $x
     * @param $y
     * @param $length
     * @param $color
     * @param $widths
     * @param $side
     * @param string $corner_style
     * @param int $r1
     * @param int $r2
     */
    protected function _border_inset($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0)
    {
        switch ($side) {
            case "top":
            case "left":
                $shade = array_map(array($this, "_shade"), $color);
                $this->_border_solid($x, $y, $length, $shade, $widths, $side, $corner_style, $r1, $r2);
                break;

case "bottom":
            case "right":
                $tint = array_map(array($this, "_tint"), $color);
                $this->_border_solid($x, $y, $length, $tint, $widths, $side, $corner_style, $r1, $r2);
                break;

default:
                return;
        }
    }

/**
     * @param $x
     * @param $y
     * @param $length
     * @param $color
     * @param $widths
     * @param $side
     * @param string $corner_style
     * @param int $r1
     * @param int $r2
     */
    protected function _border_outset($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0)
    {
        switch ($side) {
            case "top":
            case "left":
                $tint = array_map(array($this, "_tint"), $color);
                $this->_border_solid($x, $y, $length, $tint, $widths, $side, $corner_style, $r1, $r2);
                break;

case "bottom":
            case "right":
                $shade = array_map(array($this, "_shade"), $color);
                $this->_border_solid($x, $y, $length, $shade, $widths, $side, $corner_style, $r1, $r2);
                break;

default:
                return;
        }
    }

/**
     * Draws a solid, dotted, or dashed line, observing the border radius
     *
     * @param $x
     * @param $y
     * @param $length
     * @param $color
     * @param $widths
     * @param $side
     * @param string $corner_style
     * @param $pattern_name
     * @param int $r1
     * @param int $r2
     *
     * @var $top
     */
    protected function _border_line($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $pattern_name, $r1 = 0, $r2 = 0)
    {
        /** used by $$side */
        list($top, $right, $bottom, $left) = $widths;
        $width = $$side;

$pattern = $this->_get_dash_pattern($pattern_name, $width);

$half_width = $width / 2;
        $r1 -= $half_width;
        $r2 -= $half_width;
        $adjust = $r1 / 80;
        $length -= $width;

switch ($side) {
            case "top":
                $x += $half_width;
                $y += $half_width;

if ($r1 > 0) {
                    $this->_canvas->arc($x + $r1, $y + $r1, $r1, $r1, 90 - $adjust, 135 + $adjust, $color, $width, $pattern);
                }

$this->_canvas->line($x + $r1, $y, $x + $length - $r2, $y, $color, $width, $pattern);

if ($r2 > 0) {
                    $this->_canvas->arc($x + $length - $r2, $y + $r2, $r2, $r2, 45 - $adjust, 90 + $adjust, $color, $width, $pattern);
                }
                break;

case "bottom":
                $x += $half_width;
                $y -= $half_width;

if ($r1 > 0) {
                    $this->_canvas->arc($x + $r1, $y - $r1, $r1, $r1, 225 - $adjust, 270 + $adjust, $color, $width, $pattern);
                }

$this->_canvas->line($x + $r1, $y, $x + $length - $r2, $y, $color, $width, $pattern);

if ($r2 > 0) {
                    $this->_canvas->arc($x + $length - $r2, $y - $r2, $r2, $r2, 270 - $adjust, 315 + $adjust, $color, $width, $pattern);
                }
                break;

case "left":
                $y += $half_width;
                $x += $half_width;

if ($r1 > 0) {
                    $this->_canvas->arc($x + $r1, $y + $r1, $r1, $r1, 135 - $adjust, 180 + $adjust, $color, $width, $pattern);
                }

$this->_canvas->line($x, $y + $r1, $x, $y + $length - $r2, $color, $width, $pattern);

if ($r2 > 0) {
                    $this->_canvas->arc($x + $r2, $y + $length - $r2, $r2, $r2, 180 - $adjust, 225 + $adjust, $color, $width, $pattern);
                }
                break;

case "right":
                $y += $half_width;
                $x -= $half_width;

if ($r1 > 0) {
                    $this->_canvas->arc($x - $r1, $y + $r1, $r1, $r1, 0 - $adjust, 45 + $adjust, $color, $width, $pattern);
                }

$this->_canvas->line($x, $y + $r1, $x, $y + $length - $r2, $color, $width, $pattern);

if ($r2 > 0) {
                    $this->_canvas->arc($x - $r2, $y + $length - $r2, $r2, $r2, 315 - $adjust, 360 + $adjust, $color, $width, $pattern);
                }
                break;
        }
    }

/**
     * @param $opacity
     */
    protected function _set_opacity($opacity)
    {
        if (is_numeric($opacity) && $opacity <= 1.0 && $opacity >= 0.0) {
            $this->_canvas->set_opacity($opacity);
        }
    }

/**
     * @param $box
     * @param string $color
     * @param array $style
     */
    protected function _debug_layout($box, $color = "red", $style = array())
    {
        $this->_canvas->rectangle($box[0], $box[1], $box[2], $box[3], Color::parse($color), 0.1, $style);
    }
}

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