332 lines
8.2 KiB
PHP
332 lines
8.2 KiB
PHP
<?php
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/**
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* @package php-font-lib
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* @link https://github.com/PhenX/php-font-lib
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* @author Fabien Ménager <fabien.menager@gmail.com>
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* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
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* @version $Id: Font_Table_glyf.php 46 2012-04-02 20:22:38Z fabien.menager $
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*/
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/**
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* `glyf` font table.
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*
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* @package php-font-lib
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*/
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class Font_Glyph_Outline_Simple extends Font_Glyph_Outline {
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const ON_CURVE = 0x01;
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const X_SHORT_VECTOR = 0x02;
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const Y_SHORT_VECTOR = 0x04;
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const REPEAT = 0x08;
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const THIS_X_IS_SAME = 0x10;
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const THIS_Y_IS_SAME = 0x20;
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public $instructions;
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public $points;
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function parseData(){
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parent::parseData();
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if (!$this->size) {
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return;
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}
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$font = $this->getFont();
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$noc = $this->numberOfContours;
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if ($noc == 0) {
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return;
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}
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$endPtsOfContours = $font->r(array(self::uint16, $noc));
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$instructionLength = $font->readUInt16();
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$this->instructions = $font->r(array(self::uint8, $instructionLength));
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$count = $endPtsOfContours[$noc-1] + 1;
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// Flags
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$flags = array();
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for ($index = 0; $index < $count; $index++) {
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$flags[$index] = $font->readUInt8();
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if ($flags[$index] & self::REPEAT) {
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$repeats = $font->readUInt8();
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for ($i = 1; $i <= $repeats; $i++) {
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$flags[$index+$i] = $flags[$index];
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}
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$index += $repeats;
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}
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}
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$points = array();
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foreach ($flags as $i => $flag) {
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$points[$i]["onCurve"] = $flag & self::ON_CURVE;
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$points[$i]["endOfContour"] = in_array($i, $endPtsOfContours);
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}
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// X Coords
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$x = 0;
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for($i = 0; $i < $count; $i++) {
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$flag = $flags[$i];
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if ($flag & self::THIS_X_IS_SAME) {
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if ($flag & self::X_SHORT_VECTOR) {
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$x += $font->readUInt8();
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}
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}
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else {
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if ($flag & self::X_SHORT_VECTOR) {
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$x -= $font->readUInt8();
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}
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else {
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$x += $font->readInt16();
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}
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}
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$points[$i]["x"] = $x;
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}
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// Y Coords
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$y = 0;
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for($i = 0; $i < $count; $i++) {
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$flag = $flags[$i];
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if ($flag & self::THIS_Y_IS_SAME) {
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if ($flag & self::Y_SHORT_VECTOR) {
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$y += $font->readUInt8();
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}
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}
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else {
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if ($flag & self::Y_SHORT_VECTOR) {
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$y -= $font->readUInt8();
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}
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else {
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$y += $font->readInt16();
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}
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}
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$points[$i]["y"] = $y;
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}
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$this->points = $points;
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}
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public function splitSVGPath($path) {
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preg_match_all('/([a-z])|(-?\d+(?:\.\d+)?)/i', $path, $matches, PREG_PATTERN_ORDER);
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return $matches[0];
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}
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public function makePoints($path) {
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$path = $this->splitSVGPath($path);
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$l = count($path);
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$i = 0;
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$points = array();
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while($i < $l) {
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switch($path[$i]) {
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// moveTo
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case "M":
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$points[] = array(
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"onCurve" => true,
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"x" => $path[++$i],
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"y" => $path[++$i],
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"endOfContour" => false,
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);
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break;
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// lineTo
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case "L":
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$points[] = array(
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"onCurve" => true,
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"x" => $path[++$i],
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"y" => $path[++$i],
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"endOfContour" => false,
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);
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break;
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// quadraticCurveTo
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case "Q":
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$points[] = array(
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"onCurve" => false,
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"x" => $path[++$i],
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"y" => $path[++$i],
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"endOfContour" => false,
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);
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$points[] = array(
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"onCurve" => true,
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"x" => $path[++$i],
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"y" => $path[++$i],
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"endOfContour" => false,
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);
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break;
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// closePath
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/** @noinspection PhpMissingBreakStatementInspection */
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case "z":
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$points[count($points)-1]["endOfContour"] = true;
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default:
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$i++;
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break;
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}
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}
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return $points;
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}
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function encode(){
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if (empty($this->points)) {
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return parent::encode();
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}
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return $this->size = $this->encodePoints($this->points);
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}
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public function encodePoints($points) {
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$endPtsOfContours = array();
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$flags = array();
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$coords_x = array();
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$coords_y = array();
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$last_x = 0;
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$last_y = 0;
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$xMin = $yMin = 0xFFFF;
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$xMax = $yMax = -0xFFFF;
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foreach($points as $i => $point) {
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$flag = 0;
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if ($point["onCurve"]) {
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$flag |= self::ON_CURVE;
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}
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if ($point["endOfContour"]) {
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$endPtsOfContours[] = $i;
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}
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// Simplified, we could do some optimizations
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if ($point["x"] == $last_x) {
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$flag |= self::THIS_X_IS_SAME;
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}
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else {
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$x = intval($point["x"]);
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$xMin = min($x, $xMin);
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$xMax = max($x, $xMax);
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$coords_x[] = $x-$last_x; // int16
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}
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// Simplified, we could do some optimizations
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if ($point["y"] == $last_y) {
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$flag |= self::THIS_Y_IS_SAME;
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}
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else {
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$y = intval($point["y"]);
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$yMin = min($y, $yMin);
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$yMax = max($y, $yMax);
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$coords_y[] = $y-$last_y; // int16
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}
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$flags[] = $flag;
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$last_x = $point["x"];
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$last_y = $point["y"];
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}
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$font = $this->getFont();
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$l = 0;
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$l += $font->writeInt16(count($endPtsOfContours)); // endPtsOfContours
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$l += $font->writeFWord(isset($this->xMin) ? $this->xMin : $xMin); // xMin
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$l += $font->writeFWord(isset($this->yMin) ? $this->yMin : $yMin); // yMin
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$l += $font->writeFWord(isset($this->xMax) ? $this->xMax : $xMax); // xMax
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$l += $font->writeFWord(isset($this->yMax) ? $this->yMax : $yMax); // yMax
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// Simple glyf
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$l += $font->w(array(self::uint16, count($endPtsOfContours)), $endPtsOfContours); // endPtsOfContours
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$l += $font->writeUInt16(0); // instructionLength
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$l += $font->w(array(self::uint8, count($flags)), $flags); // flags
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$l += $font->w(array(self::int16, count($coords_x)), $coords_x); // xCoordinates
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$l += $font->w(array(self::int16, count($coords_y)), $coords_y); // yCoordinates
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return $l;
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}
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public function getSVGContours($points = null){
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$path = "";
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if (!$points) {
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if (empty($this->points)) {
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$this->parseData();
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}
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$points = $this->points;
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}
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$length = count($points);
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$firstIndex = 0;
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$count = 0;
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for($i = 0; $i < $length; $i++) {
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$count++;
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if ($points[$i]["endOfContour"]) {
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$path .= $this->getSVGPath($points, $firstIndex, $count);
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$firstIndex = $i + 1;
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$count = 0;
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}
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}
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return $path;
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}
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protected function getSVGPath($points, $startIndex, $count) {
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$offset = 0;
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$path = "";
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while($offset < $count) {
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$point = $points[ $startIndex + $offset %$count ];
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$point_p1 = $points[ $startIndex + ($offset+1)%$count ];
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if($offset == 0) {
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$path .= "M{$point['x']},{$point['y']} ";
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}
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if ($point["onCurve"]) {
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if ($point_p1["onCurve"]) {
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$path .= "L{$point_p1['x']},{$point_p1['y']} ";
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$offset++;
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}
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else {
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$point_p2 = $points[ $startIndex + ($offset+2)%$count ];
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if ($point_p2["onCurve"]){
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$path .= "Q{$point_p1['x']},{$point_p1['y']},{$point_p2['x']},{$point_p2['y']} ";
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}
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else {
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$path .= "Q{$point_p1['x']},{$point_p1['y']},".$this->midValue($point_p1['x'], $point_p2['x']).",".$this->midValue($point_p1['y'], $point_p2['y'])." ";
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}
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$offset += 2;
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}
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}
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else {
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if ($point_p1["onCurve"]) {
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$path .= "Q{$point['x']},{$point['y']},{$point_p1['x']},{$point_p1['y']} ";
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}
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else {
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$path .= "Q{$point['x']},{$point['y']},".$this->midValue($point['x'], $point_p1['x']).",".$this->midValue($point['y'], $point_p1['y'])." ";
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}
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$offset++;
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}
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}
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$path .= "z ";
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return $path;
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}
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function midValue($a, $b){
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return $a + ($b - $a)/2;
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}
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} |