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<?php |
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namespace AmaTeam\Image\Projection\Type; |
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use AmaTeam\Image\Projection\API\SpecificationInterface; |
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use AmaTeam\Image\Projection\API\Tile\TileInterface; |
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use AmaTeam\Image\Projection\API\Type\MappingInterface; |
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use AmaTeam\Image\Projection\API\Type\ReaderInterface; |
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class BilinearReader implements ReaderInterface |
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{ |
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/** |
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* @var MappingInterface |
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*/ |
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private $mapping; |
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/** |
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* @var TileInterface[][][] |
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*/ |
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private $tiles; |
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/** |
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* @var int |
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*/ |
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private $height; |
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/** |
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* @var int |
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*/ |
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private $width; |
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/** |
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* @var int |
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*/ |
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private $tileWidth; |
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/** |
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* @var int |
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*/ |
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private $tileHeight; |
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/** |
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* @param SpecificationInterface $specification |
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* @param MappingInterface $mapping |
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* @param TileInterface[][][] $tiles |
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*/ |
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public function __construct( |
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SpecificationInterface $specification, |
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MappingInterface $mapping, |
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array $tiles |
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) { |
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$this->mapping = $mapping; |
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$this->tiles = $tiles; |
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$this->width = $specification->getSize()->getWidth(); |
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$this->height = $specification->getSize()->getHeight(); |
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$this->tileWidth = $specification->getTileSize()->getWidth(); |
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$this->tileHeight = $specification->getTileSize()->getHeight(); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function getColorAt($latitude, $longitude) |
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{ |
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$position = $this |
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->mapping |
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->getPosition($latitude, $longitude); |
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return self::mix($this->getColorsAt($position[0], $position[1], $position[2])); |
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} |
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/** |
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* This method samples texel this specific point belongs to, as |
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* well as three closest to it. After all texels have been sampled, |
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* each is mixed in according to it's weight (proximity to UV |
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* point). |
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* |
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* @param string|int $face |
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* @param float $u |
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* @param float $v |
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* @return array |
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*/ |
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private function getColorsAt($face, $u, $v) |
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{ |
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$colors = []; |
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$normalizedU = $u * $this->width - 0.5; |
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$normalizedV = $v * $this->height - 0.5; |
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$x1 = (int) $normalizedU; |
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$y1 = (int) $normalizedV; |
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$x2 = $x1 + 1; |
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$y2 = $y1 + 1; |
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foreach ([$x1, $x2] as $x) { |
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foreach ([$y1, $y2] as $y) { |
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if ($x < 0 || $x >= $this->width || $y < 0 || $y >= $this->height) { |
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continue; |
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} |
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$column = (int) ($x / $this->tileWidth); |
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$row = (int) ($y / $this->tileHeight); |
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$tileX = $x % $this->tileWidth; |
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$tileY = $y % $this->tileHeight; |
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$color = $this |
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->tiles[$face][$row][$column] |
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->getImage() |
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->getColorAt($tileX, $tileY); |
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$diffX = $x - $normalizedU; |
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$diffY = $y - $normalizedV; |
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$weight = 1 / sqrt($diffY * $diffY + $diffX * $diffX); |
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$colors[] = [$color, $weight]; |
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} |
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} |
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return $colors; |
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} |
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private static function mix(array $colors) |
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{ |
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$red = 0; |
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$green = 0; |
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$blue = 0; |
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$alpha = 0; |
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$weight = 0; |
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foreach ($colors as $source) { |
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$sourceRed = ($source[0] >> 24) & 0xFF; |
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$sourceGreen = ($source[0] >> 16) & 0xFF; |
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$sourceBlue = ($source[0] >> 8) & 0xFF; |
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$sourceAlpha = $source[0] & 0xFF; |
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$weight += $source[1]; |
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$red += $sourceRed * $source[1]; |
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$green += $sourceGreen * $source[1]; |
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$blue += $sourceBlue * $source[1]; |
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$alpha += $sourceAlpha * $source[1]; |
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} |
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$red /= $weight; |
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$blue /= $weight; |
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$green /= $weight; |
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$alpha /= $weight; |
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return ((int) $red) << 24 | ((int) $green) << 16 | ((int) $blue) << 8 | ((int) $alpha); |
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} |
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} |
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ama-team /
php-projection-framework
