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Working cropCircle() #135

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Working cropCircle() #135

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92 changes: 92 additions & 0 deletions Adapter/GD.php
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Original file line number Diff line number Diff line change
Expand Up @@ -109,6 +109,98 @@ public function crop($x, $y, $width, $height)
return $this;
}


public function cropCircle($x, $y, $diameter, $border_width = 0, $border_color = 'ffffff')
{
// http://stackoverflow.com/questions/999251/crop-or-mask-an-image-into-a-circle?rq=1
// factor to antialiase, tradeoff between quality and memory consumption
$antialias_factor = 1;

if ($diameter < 800) {
$antialias_factor = 2;
}

if ($diameter < 500) {
$antialias_factor = 2.5;
}
if ($diameter < 200) {
$antialias_factor = 3.5;
}


// scale up to and afterwards down to reduce antialising effect
$this->forceResize($this->width() * $antialias_factor, $this->height() * $antialias_factor);

$x = $x * $antialias_factor;
$y = $y * $antialias_factor;
$diameter = $diameter * $antialias_factor;

$b_width = (int)$border_width * $antialias_factor;

$this->crop($x, $y, $diameter, $diameter);

$w = $this->width();
$h = $this->height();

$src = $this->resource;
$newpic = imagecreatetruecolor($w, $h);
imagealphablending($newpic, false);
$transparent = imagecolorallocatealpha($newpic, 0, 0, 0, 127);

$r = $w / 2;

try {
$colorRGBA = ImageColor::parse($border_color);
// taken from gdAllocate()
// could be a separate helper function
$col_b = ($colorRGBA) & 0xff;
$colorRGBA >>= 8;
$col_g = ($colorRGBA) & 0xff;
$colorRGBA >>= 8;
$col_r = ($colorRGBA) & 0xff;
$colorRGBA >>= 8;
$col_a = ($colorRGBA) & 0xff;
} catch (\InvalidArgumentException $e) {
$b_width = 0;
$col_a = 127;
$col_r = $col_g = $col_b = 0;
}
$b_color = imagecolorallocatealpha($newpic, $col_r, $col_g, $col_b, $col_a);

// stitch out the circle
for ($x = 0; $x < $w; $x++) {
for ($y = 0; $y < $h; $y++) {
$c = imagecolorat($src, $x, $y);
$_x = $x - $w / 2;
$_y = $y - $h / 2;

$x2 = ($_x * $_x);
$y2 = ($_y * $_y);
$r2 = ($r * $r);
$rb2 = (($r - $b_width) * ($r - $b_width));

if (($x2 + $y2) < $r2) {
imagesetpixel($newpic, $x, $y, $c);
// draw border
if (((int)$b_width > 0) && (($x2 + $y2) >= $rb2)) {
imagesetpixel($newpic, $x, $y, $b_color);
}
} else {
imagesetpixel($newpic, $x, $y, $transparent);
}
}
}
imagesavealpha($newpic, true);
$this->resource = $newpic;

// scale down
$this->forceResize($this->width() / $antialias_factor, $this->height() / $antialias_factor);
return $this;
}




/**
* {@inheritdoc}
*/
Expand Down