Version 4.2.0
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<?php
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/**
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* @brief Letter photo generator for member accounts
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* @author <a href='https://www.invisioncommunity.com'>Invision Power Services, Inc.</a>
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* @copyright (c) Invision Power Services, Inc.
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* @license https://www.invisioncommunity.com/legal/standards/
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* @package Invision Community
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* @since 3 Feb 2017
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*/
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namespace IPS\Member;
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/* To prevent PHP errors (extending class does not exist) revealing path */
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if ( !defined( '\IPS\SUITE_UNIQUE_KEY' ) )
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{
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header( ( isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0' ) . ' 403 Forbidden' );
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exit;
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}
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/**
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* Letter photo generator for member accounts
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*/
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class _LetterPhoto
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{
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/**
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* @brief File storage class to use
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*/
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protected $fileStorageClass = 'core_Profile';
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/**
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* @brief Member name
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*/
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protected $name = NULL;
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/**
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* @brief Text size
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*/
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protected $textSize = 75;
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/**
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* Create a new photo object
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*
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* @param string $name Member's name
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* @return void
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*/
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public function __construct( $name='' )
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{
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$this->name = $name;
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}
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/**
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* Create the photo
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*
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* @param int $maxWidth Max width
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* @param int $maxHeight Max height
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* @param int $letterCount How many letters to use
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* @return \IPS\Http\Url|NULL
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*/
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public function create( $maxWidth, $maxHeight, $letterCount=1 )
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{
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/* If we don't have any sizes, we can't generate a proper image */
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if( !$maxWidth OR !$maxHeight )
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{
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return NULL;
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}
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/* Set the font size to 1/2 of the $maxWidth and $maxHeight (which should be the same value) */
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$this->textSize = ( ( $maxWidth / 2 ) / $letterCount );
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/* If we don't have a name, there's nothing to create */
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if( !$this->name )
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{
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return NULL;
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}
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/* Get the first character of the name...if we can't detect it, there's again nothing to convert */
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$letters = $this->getLetters( $letterCount );
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if( !$letters )
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{
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return NULL;
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}
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/* Now we have to generate the background color we will be using */
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$rgbColor = $this->generateColorCode();
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/* Create the image */
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$image = \IPS\Image::newImageCanvas( $maxWidth, $maxHeight, $rgbColor );
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/* Draw the text on the image */
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$image->write( $letters, $this->getFont( $letters ), $this->textSize );
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/* Save the image and return it */
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try
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{
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return \IPS\File::create( $this->fileStorageClass, $letters . '.png', (string) $image, NULL, TRUE );
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}
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catch( \Exception $e )
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{
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\IPS\Log::debug( $e, 'letter_photo' );
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return NULL;
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}
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}
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/**
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* Return the first X non-punctuation characters of the name
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*
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* @param int $letters Number of letters to return
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* @return string|NULL
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*/
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protected function getLetters( $letters=1 )
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{
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$name = str_replace( array( '<', '>', '=', '-', '+', '"', "'" ), '', $this->name );
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$name = preg_replace( "/(\pP)+/u", '', trim( $name ) );
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return mb_strtoupper( mb_substr( $name, 0, $letters ) );
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}
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/**
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* @brief Color saturation to use for HSV colors
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*/
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protected $colorCodeSaturation = .45;
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/**
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* @brief Color value to use for HSV colors
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*/
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protected $colorCodeValue = 0.575;
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/**
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* @brief If we have just generated a hue on this page load, store it to better randomize the next color
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*/
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protected static $lastHue = NULL;
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/**
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* Return a unique color code based on the name.
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*
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* @return array (RGB value)
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*/
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protected function generateColorCode()
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{
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/* If we've already generated a hue on this page load, use the golden ratio to find a number sufficiently distinct */
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if( static::$lastHue )
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{
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$hue = static::$lastHue + 0.618033988749895;
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if( $hue > 1.0 )
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{
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$hue -= 1.0;
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}
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static::$lastHue = $hue;
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return $this->convertHsvToRgb( $hue, $this->colorCodeSaturation, $this->colorCodeValue );
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}
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$hue = ( ( ord( \mb_strtolower( $this->name ) ) - 97 ) / 25.0 ) + 0.25;
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$hue *= 1.61803398875;
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$hue *= (float) ( '1.' . rand() ) / 1;
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if( rand( 0, 1 ) )
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{
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$float = (float) ( "1." . ord( array_rand( range( 'a', 'z' ) ) ) );
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$hue = abs( $float - $hue );
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}
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while( $hue > 1.0 )
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{
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$hue -= 1.0;
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}
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static::$lastHue = $hue;
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return $this->convertHsvToRgb( $hue, $this->colorCodeSaturation, $this->colorCodeValue );
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}
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/**
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* Convert the HSV value to RGB
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*
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* @param float $h Hue
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* @param float $s Saturation
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* @param float $v Value
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* @return array
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*/
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protected function convertHsvToRgb( $h, $s, $v )
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{
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$rgb = array( $v, $v, $v );
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$diff = ( $v <= 0.5 ) ? ( $v * ( 1.0 + $s ) ) : ( $v + $s - $v * $s );
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if( $diff )
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{
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$m = $v + $v - $diff;
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$sv = ( $diff - $m ) / $diff;
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$h *= 6.0;
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$fract = $h - floor( $h );
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$vsf = $diff * $sv * $fract;
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$mid1 = $m + $vsf;
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$mid2 = $diff - $vsf;
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switch( floor( $h ) )
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{
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case 0:
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$rgb = array( $diff, $mid1, $m );
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break;
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case 1:
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$rgb = array( $mid2, $diff, $m );
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break;
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case 2:
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$rgb = array( $m, $diff, $mid1 );
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break;
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case 3:
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$rgb = array( $m, $mid2, $diff );
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break;
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case 4:
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$rgb = array( $mid1, $m, $diff );
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break;
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case 5:
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$rgb = array( $diff, $m, $mid2 );
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break;
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}
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}
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return array_map( function( $value ) { return $value * 256.0; }, $rgb );
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}
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/**
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* Return a font file path to use
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*
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* @param string $string String we are going to write
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* @return string
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*/
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protected function getFont( $string='' )
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{
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$codePointMap = array(
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'NotoSansArmenian-Regular.ttf' => array( 0x0530, 0x058F ),
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'NotoSansHebrew-Regular.ttf' => array( 0x0590, 0x05FF ),
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'NotoNaskhArabic-Regular.ttf' => array( 0x0600, 0x06FF ),
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'NotoSansGeorgian-Regular.ttf' => array( 0x10A0, 0x10FF ),
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'NotoSansThai-Regular.ttf' => array( 0x0E00, 0x0E7F ),
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'NotoSansDevanagari-Regular.ttf' => array( 0x0900, 0x097F ),
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'BMDOHYEON.ttf' => array(
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array( 0xAC00, 0xD7A3 ),
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array( 0x1100, 0x11FF ),
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array( 0x3130, 0x318F ),
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array( 0xA960, 0xA97F ),
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array( 0xD7B0, 0xD7FF )
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),
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'HanaMinA.ttf' => array(
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array( 0x4E00, 0x9FFF ),
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array( 0x3400, 0x4DB5 ),
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array( 0x3040, 0x309F ),
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array( 0x30A0, 0x30FF ),
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array( 0xFF00, 0xFFEF ),
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array( 0xF900, 0xFAD9 ),
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array( 0x20000, 0x2A6D6 ),
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array( 0x2A700, 0x2B734 ),
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array( 0x2B740, 0x2B81D ),
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array( 0x2B820, 0x2CEA1 ),
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array( 0x2F800, 0x2FA1D )
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),
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);
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/* Get all characters */
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$characters = preg_split( '//u', $string, null, PREG_SPLIT_NO_EMPTY );
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/* Loop over all characters. If any character is in a range defined above, use that font.
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Technically you could have a Korean character and an Arabic character in the same string, but the probability of that occurring
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is sufficiently rare that we will use the first font defined above which support latin ranges already */
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foreach( $characters as $character )
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{
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$decValue = unpack( 'N', mb_convert_encoding( $character, 'UCS-4BE', 'UTF-8' ) );
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$decValue = $decValue[1];
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foreach( $codePointMap as $fontFile => $range )
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{
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if( is_array( $range[0] ) )
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{
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foreach( $range as $subRange )
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{
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if( $decValue > ( $subRange[0] ) AND $decValue < ( $subRange[1] ) )
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{
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return \IPS\ROOT_PATH . '/system/3rd_party/Fonts/' . $fontFile;
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}
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}
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}
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else
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{
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if( $decValue > ( $range[0] ) AND $decValue < ( $range[1] ) )
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{
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return \IPS\ROOT_PATH . '/system/3rd_party/Fonts/' . $fontFile;
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}
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}
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}
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}
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/* Fallback for the majority of languages */
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return \IPS\ROOT_PATH . '/system/3rd_party/Fonts/NotoSans-Regular.ttf';
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}
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}
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