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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
*/
/**
* Base renderer class
*
* @access private
* @package dompdf
*/
abstract class Abstract_Renderer {
/**
* Rendering backend
*
* @var 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 = $height;
//debugpng
if (DEBUGPNG) print '[_background_image '.$url.']';
list($img, $type, /*$msg*/) = Image_Cache::resolve_url(
$url,
$sheet->get_protocol(),
$sheet->get_host(),
$sheet->get_base_path(),
$this->_dompdf
);
// Bail if the image is no good
if ( Image_Cache::is_broken($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, $img_h) = dompdf_getimagesize($img);
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) = $style->background_position;
if ( is_percent($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)*$dpi / 72);
if ( is_percent($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_Adapter &&
$this->_canvas->get_cpdf()->image_iscached($filedummy) ) {
$bg = null;
}
else {
// Create a new image to fit over the background rectangle
$bg = imagecreatetruecolor($bg_width, $bg_height);
switch (strtolower($type)) {
case IMAGETYPE_PNG:
$is_png = true;
imagesavealpha($bg, true);
imagealphablending($bg, false);
$src = imagecreatefrompng($img);
break;
case IMAGETYPE_JPEG:
$src = imagecreatefromjpeg($img);
break;
case IMAGETYPE_GIF:
$src = imagecreatefromgif($img);
break;
case IMAGETYPE_BMP:
$src = imagecreatefrombmp($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_Adapter ) {
// 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 (DEBUGPNG) print '[_background_image '.$tmp_file.']';
imagepng($bg, $tmp_file);
$this->_canvas->image($tmp_file, $x, $y, $width, $height);
imagedestroy($bg);
//debugpng
if (DEBUGPNG) print '[_background_image unlink '.$tmp_file.']';
if (!DEBUGKEEPTEMP) {
unlink($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], $box[3], CSS_Color::parse($color), 0.1, $style);
}
}
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