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<?php
/**
* The Processor class processes an image and prepares
* the color values needed for the ascii output.
*
* Its main job is to process each pixel, do color calculations and
* store an internal color array for later ascii output, which then is done
* by its helper Result classes.
*
* (c) 2016 Alex Schenkel
*/
namespace Img2Ascii;
class Processor {
protected $imgPath;
protected $image;
protected $imageWidth;
protected $imageHeight;
protected $result;
public function __construct($pathOrImgres) {
if (is_file($pathOrImgres)) {
$this->imgPath = $pathOrImgres;
$this->image = imagecreatefromstring(file_get_contents($pathOrImgres));
} else {
$this->image = $pathOrImgres;
}
try {
$this->imageWidth = imagesx($this->image);
$this->imageHeight = imagesy($this->image);
} catch (\Exception $e) {
throw new \Exception("Image creation failed. Is the given resource a valid image?");
}
}
public function asciify($pixelWidth = 10) {
$charsX = floor($this->imageWidth / $pixelWidth);
return $this->asciifyToWidth($charsX);
}
public function asciifyToWidth($charsX) {
$charsX = (int)$charsX;
if (!$charsX) $charsX = floor($this->imageWidth / 10);
$this->result = null;
$blockWidth = $this->imageWidth / (float)$charsX;
$blockHeight = $blockWidth * 8.0/5.0;
$blockWidth = max(1,floor($blockWidth));
$blockHeight = max(1,floor($blockHeight));
$ascii = array();
for ($y = 0; $y < $this->imageHeight; $y += $blockHeight) {
for ($x = 0; $x < $this->imageWidth; $x += $blockWidth) {
$value = [0,0,0];
if ($x === 0) {
$ascii[$y / $blockHeight] = array();
}
$counter = 0;
for ($innerY = $y; $innerY < $y + $blockHeight; $innerY++) {
if ($innerY > $this->imageHeight-1) break;
for ($innerX = $x; $innerX < $x + $blockWidth; $innerX++) {
if ($innerX > $this->imageWidth-1) break;
$counter++;
$rgb = imagecolorat($this->image,$innerX, $innerY);
$rgb = array($rgb >> 16, $rgb >> 8 & 255, $rgb & 255);
$value[0] += $rgb[0];
$value[1] += $rgb[1];
$value[2] += $rgb[2];
}
}
$value[0] = $value[0] / $counter;
$value[1] = $value[1] / $counter;
$value[2] = $value[2] / $counter;
$ascii[$y / $blockHeight][$x / $blockWidth] = $value;
}
}
$this->result = $ascii;
return $this;
}
protected function saturate($ascii) {
foreach($ascii as $y =>$line) {
foreach($line as $x => $value) {
$ascii[$y][$x] = $value[0]*1 + $value[1]*1 + $value[2]*1;
}
}
return $ascii;
}
public function colorResult($blockChar = '#') {
$res = new ColorResult($this->result);
$res->blockChar = $blockChar;
return $res;
}
public function result($symbols = "@%#*+=-:. ") {
$res = new BlackWhiteResult($this->saturate($this->result));
$res->symbols = $symbols;
return $res;
}
}
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