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<?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->get_canvas(); }
/** * 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->get_option("debugPng")) 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->get_option("dpi");
//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 + $style->length_in_pt($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 + $style->length_in_pt($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);
if ($ti >= 0) { $tc = imagecolorsforindex($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->get_option("temp_dir"); $tmp_name = tempnam($tmp_dir, "bg_dompdf_img_"); @unlink($tmp_name); $tmp_file = "$tmp_name.png";
//debugpng if ($this->_dompdf->get_option("debugPng")) print '[_background_image ' . $tmp_file . ']';
imagepng($bg, $tmp_file); $this->_canvas->image($tmp_file, $x, $y, $width, $height); imagedestroy($bg);
//debugpng if ($this->_dompdf->get_option("debugPng")) print '[_background_image unlink ' . $tmp_file . ']';
if (!$this->_dompdf->get_option("debugKeepTemp")) { unlink($tmp_file); } }
$this->_canvas->clipping_end(); }
protected function _get_dash_pattern($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 $pattern; }
protected function _border_none($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0) { return; }
protected function _border_hidden($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $r1 = 0, $r2 = 0) { return; }
// Border rendering functions
protected function _border_dotted($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, $r2); }
protected function _border_dashed($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, $r2); }
protected function _border_solid($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, $color, null, null, true); break;
default: return; } }
protected function _apply_ratio($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 * $ratio; break;
default: return;
} }
protected function _border_double($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, $r2); }
protected function _border_groove($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, $r2);
}
protected function _border_ridge($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, $r2);
}
protected function _tint($c) { if (!is_numeric($c)) return $c;
return min(1, $c + 0.16); }
protected function _shade($c) { if (!is_numeric($c)) return $c;
return max(0, $c - 0.33); }
protected function _border_inset($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, $r2); break;
default: return; } }
protected function _border_outset($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, $r2); break;
default: return; } }
// Draws a solid, dotted, or dashed line, observing the border radius protected function _border_line($x, $y, $length, $color, $widths, $side, $corner_style = "bevel", $pattern_name, $r1 = 0, $r2 = 0) { list($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, $pattern); } break; } }
protected function _set_opacity($opacity) { if (is_numeric($opacity) && $opacity <= 1.0 && $opacity >= 0.0) { $this->_canvas->set_opacity($opacity); } }
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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