public function __construct(array $diagonalValues)
{
$diagonalCount = count($diagonalValues);
$rowCount = $diagonalCount;
$colCount = $rowCount;
parent::__construct($rowCount, $colCount);
for ($currentRow = 0; $currentRow < $rowCount; $currentRow++) {
for ($currentCol = 0; $currentCol < $colCount; $currentCol++) {
if ($currentRow == $currentCol) {
$this->setValue($currentRow, $currentCol, $diagonalValues[$currentRow]);
} else {
$this->setValue($currentRow, $currentCol, 0);
}
}
}
}
public function __construct($img, $resize = 1.0, $invert = false, $weight = 0.5, $dither = self::DITHER_ERROR)
{
$ext = strtolower(pathinfo($img, PATHINFO_EXTENSION));
if ($ext == 'jpg') {
$ext = 'jpeg';
}
$imagecreator = 'imagecreatefrom' . $ext;
if (!function_exists($imagecreator)) {
throw new \Exception('Image format not supported.', 1);
}
$im = $imagecreator($img);
$w = imagesx($im);
$h = imagesy($im);
// Resize image
$nw = ceil($resize * $w);
$nh = ceil($resize * $h * 0.75);
$new_img = imagecreatetruecolor($nw, $nh);
imagesavealpha($new_img, true);
imagealphablending($new_img, false);
imagefill($new_img, 0, 0, imagecolorallocate($new_img, 255, 255, 255));
imagecopyresized($new_img, $im, 0, 0, 0, 0, $nw, $nh, $w, $h);
imagedestroy($im);
$im = $new_img;
$w = $nw;
$h = $nh;
// Init Dot Matrix
parent::__construct($w, $h);
// Create the color matrix
$color_img_w = ceil($w / 2);
$color_img_h = ceil($h / 4);
// Lower precision -> faster palette lookup -> uglier colors.
$min_color_precision = 20;
$color_img = imagecreatetruecolor($color_img_w, $color_img_h);
imagesavealpha($color_img, true);
imagealphablending($color_img, false);
imagefill($color_img, 0, 0, imagecolorallocate($color_img, 255, 255, 255));
imagecopyresized($color_img, $im, 0, 0, 0, 0, $color_img_w, $color_img_h, $w, $h);
// ANSI 8bit Palette
$ansi256palette = [0x0, 0x800000, 0x8000, 0x808000, 0x80, 0x800080, 0x8080, 0xc0c0c0, 0x808080, 0xff0000, 0xff00, 0xffff00, 0xff, 0xff00ff, 0xffff, 0xffffff, 0x0, 0x5f, 0x87, 0xaf, 0xd7, 0xff, 0x5f00, 0x5f5f, 0x5f87, 0x5faf, 0x5fd7, 0x5fff, 0x8700, 0x875f, 0x8787, 0x87af, 0x87d7, 0x87ff, 0xaf00, 0xaf5f, 0xaf87, 0xafaf, 0xafd7, 0xafff, 0xd700, 0xd75f, 0xd787, 0xd7af, 0xd7d7, 0xd7ff, 0xff00, 0xff5f, 0xff87, 0xffaf, 0xffd7, 0xffff, 0x5f0000, 0x5f005f, 0x5f0087, 0x5f00af, 0x5f00d7, 0x5f00ff, 0x5f5f00, 0x5f5f5f, 0x5f5f87, 0x5f5faf, 0x5f5fd7, 0x5f5fff, 0x5f8700, 0x5f875f, 0x5f8787, 0x5f87af, 0x5f87d7, 0x5f87ff, 0x5faf00, 0x5faf5f, 0x5faf87, 0x5fafaf, 0x5fafd7, 0x5fafff, 0x5fd700, 0x5fd75f, 0x5fd787, 0x5fd7af, 0x5fd7d7, 0x5fd7ff, 0x5fff00, 0x5fff5f, 0x5fff87, 0x5fffaf, 0x5fffd7, 0x5fffff, 0x870000, 0x87005f, 0x870087, 0x8700af, 0x8700d7, 0x8700ff, 0x875f00, 0x875f5f, 0x875f87, 0x875faf, 0x875fd7, 0x875fff, 0x878700, 0x87875f, 0x878787, 0x8787af, 0x8787d7, 0x8787ff, 0x87af00, 0x87af5f, 0x87af87, 0x87afaf, 0x87afd7, 0x87afff, 0x87d700, 0x87d75f, 0x87d787, 0x87d7af, 0x87d7d7, 0x87d7ff, 0x87ff00, 0x87ff5f, 0x87ff87, 0x87ffaf, 0x87ffd7, 0x87ffff, 0xaf0000, 0xaf005f, 0xaf0087, 0xaf00af, 0xaf00d7, 0xaf00ff, 0xaf5f00, 0xaf5f5f, 0xaf5f87, 0xaf5faf, 0xaf5fd7, 0xaf5fff, 0xaf8700, 0xaf875f, 0xaf8787, 0xaf87af, 0xaf87d7, 0xaf87ff, 0xafaf00, 0xafaf5f, 0xafaf87, 0xafafaf, 0xafafd7, 0xafafff, 0xafd700, 0xafd75f, 0xafd787, 0xafd7af, 0xafd7d7, 0xafd7ff, 0xafff00, 0xafff5f, 0xafff87, 0xafffaf, 0xafffd7, 0xafffff, 0xd70000, 0xd7005f, 0xd70087, 0xd700af, 0xd700d7, 0xd700ff, 0xd75f00, 0xd75f5f, 0xd75f87, 0xd75faf, 0xd75fd7, 0xd75fff, 0xd78700, 0xd7875f, 0xd78787, 0xd787af, 0xd787d7, 0xd787ff, 0xd7af00, 0xd7af5f, 0xd7af87, 0xd7afaf, 0xd7afd7, 0xd7afff, 0xd7d700, 0xd7d75f, 0xd7d787, 0xd7d7af, 0xd7d7d7, 0xd7d7ff, 0xd7ff00, 0xd7ff5f, 0xd7ff87, 0xd7ffaf, 0xd7ffd7, 0xd7ffff, 0xff0000, 0xff005f, 0xff0087, 0xff00af, 0xff00d7, 0xff00ff, 0xff5f00, 0xff5f5f, 0xff5f87, 0xff5faf, 0xff5fd7, 0xff5fff, 0xff8700, 0xff875f, 0xff8787, 0xff87af, 0xff87d7, 0xff87ff, 0xffaf00, 0xffaf5f, 0xffaf87, 0xffafaf, 0xffafd7, 0xffafff, 0xffd700, 0xffd75f, 0xffd787, 0xffd7af, 0xffd7d7, 0xffd7ff, 0xffff00, 0xffff5f, 0xffff87, 0xffffaf, 0xffffd7, 0xffffff, 0x80808, 0x121212, 0x1c1c1c, 0x262626, 0x303030, 0x3a3a3a, 0x444444, 0x4e4e4e, 0x585858, 0x606060, 0x666666, 0x767676, 0x808080, 0x8a8a8a, 0x949494, 0x9e9e9e, 0xa8a8a8, 0xb2b2b2, 0xbcbcbc, 0xc6c6c6, 0xd0d0d0, 0xdadada, 0xe4e4e4, 0xeeeeee];
$colormap = [];
foreach ($ansi256palette as $rgb) {
$colormap[] = [$rgb >> 16 & 0xff, $rgb >> 8 & 0xff, $rgb & 0xff];
}
$ansi256palette = $colormap;
$colormap = [];
// Find nearest match of passed RGB with ANSI palette
$nearest = function ($rgb) use($ansi256palette, $min_color_precision) {
$best = 0;
$dist = 10000;
foreach ($ansi256palette as $idx => $a) {
$d = sqrt(pow($rgb['red'] - $a[0], 2) + pow($rgb['green'] - $a[1], 2) + pow($rgb['blue'] - $a[2], 2));
if ($d < $dist) {
$dist = $d;
$best = $idx;
if ($d <= $min_color_precision) {
break;
}
}
}
return $best;
};
// Read colors
$c = $this->colors;
for ($y = $color_img_h; $y--;) {
$y0 = $y * $color_img_w;
for ($x = $color_img_w; $x--;) {
$c[$y0 + $x] = $nearest(imagecolorsforindex($color_img, imagecolorat($color_img, $x, $y)));
}
}
$this->colors = $c;
imagedestroy($color_img);
// Invert image for dark backgrounds
if ($invert) {
imagefilter($im, IMG_FILTER_NEGATE);
}
$pixels = new \SplFixedArray($w * $h);
for ($y = $h; $y--;) {
for ($x = $w, $y0 = $y * $w; $x--;) {
$pixels[$x + $y0] = imagecolorat($im, $x, $y);
}
}
imagedestroy($im);
$m = $this->matrix;
switch ($dither) {
// Threshold 1-bit quantization
case self::DITHER_NONE:
default:
$tresh = 0xffffff * $weight & 0xffffff;
$b = $invert ? 1 : 0;
for ($y = 0; $y < $h; $y++) {
$y0 = $y * $w;
$y1 = $y0 + $w;
$y2 = $y1 + $w;
for ($x = 0; $x < $w; $x++) {
$idx = $x + $y0;
$m[$idx] = $pixels[$idx] <= $tresh ? $pixels[$idx] : $b;
}
}
break;
// Dither image with 1-bit Atkinson Dithering
// Adapted from : https://gist.github.com/lordastley/1342627
// Dither image with 1-bit Atkinson Dithering
// Adapted from : https://gist.github.com/lordastley/1342627
case self::DITHER_ERROR:
$tresh = 0xffffff * $weight & 0xffffff;
for ($y = 0; $y < $h; $y++) {
$y0 = $y * $w;
$y1 = $y0 + $w;
$y2 = $y1 + $w;
for ($x = 0; $x < $w; $x++) {
$idx = $x + $y0;
$old = $pixels[$idx];
if ($old > $tresh) {
$error_diffusion = $old - 0xffffff >> 3;
} else {
$error_diffusion = $old >> 3;
$m[$idx] = $old;
}
$x1 = $x + 1;
$x2 = $x + 2;
$x_1 = $x - 1;
foreach ([$x1 + $y0, $x2 + $y0, $x_1 + $y1, $x + $y1, $x1 + $y1, $x + $y2] as $ofs) {
if (isset($pixels[$ofs])) {
$pixels[$ofs] += $error_diffusion;
}
}
}
}
break;
}
}
